A valve and system for automatically closing the air inlet of a transformer oil return pipeline

Abstract

1. The invention discloses a valve and system for self-closing the air intake of a transformer return oil pipeline, which relates to the technical field of power detection auxiliary equipment; the valve comprises a valve body, an oil chamber in the valve body, a first return oil pipe at the lower part of the valve body for oil to enter the oil chamber, a bell pipe at the bottom of the valve body for oil in the oil chamber to flow out of the valve body, a second return oil pipe on the bell pipe, an oil separator inside the oil chamber for preventing gas in the first return oil pipe from flowing to the bell pipe, a support rod, a float, a guide wheel, a positioning wheel, a self-closing ball and a lead, an air intake port on the upper part of the valve body and an exhaust valve on the air intake port; the system comprises the above-mentioned valve and also includes an online monitoring device for dissolved gas in oil and a transformer, which realizes the discharge of air in the return oil pipe through the valve body, the oil chamber, the first return oil pipe, the bell pipe, the second return oil pipe, the oil separator, the support rod, the float, the guide wheel, the positioning wheel, the self-closing ball, the lead, the air intake port and the exhaust valve, so as to prevent air in the return oil pipe from entering the transformer.

Description

Technical Field

[0001] The present invention relates to the technical field of power detection auxiliary equipment, and in particular to a valve and a system for automatically closing the air intake of a transformer oil return pipeline. Background Art

[0002] At present, the online monitoring device for dissolved gas in transformer oil is an effective means to effectively detect whether there is partial discharge inside the transformer.

[0003] The search formula TTL_ALL:(valve) AND TACD_ALL:(transformer AND oil return pipe AND gas AND valve) obtains the following relatively close existing technical solutions.

[0004] The authorization announcement number is CN 105259260 B, and is titled "A Transformer Oil Chromatography Online Monitoring Device with a Three-Way Valve." The device comprises an online monitor, a degassing device, and a three-way valve. The degassing device includes a sampling chamber, a vacuum degassing chamber, and a controller. The sampling chamber comprises a primary oil storage chamber and a secondary oil storage chamber, each equipped with a primary oil inlet pipe and a primary oil outlet pipe. The secondary oil storage chamber is equipped with a secondary oil outlet pipe, and an ultrasonic oscillator is located outside the secondary oil storage chamber. The vacuum degassing chamber comprises an atmospheric pressure tank and a vacuum degassing tank, each equipped with a gas sampling needle, a vacuum tube, and a first oil return pipe. The three-way valve is connected to the second oil inlet pipe and the second oil return pipe. The degassing device has excellent degassing performance and a high degree of automation, significantly improving the efficiency, sensitivity, and stability of transformer oil chromatography online monitoring.

[0005] The authorization publication number is CN 213394650 U, and it is titled "An Oil Pipeline Control Valve for a Transformer Online Monitoring System." It comprises a valve body with a housing welded to its top. A drive motor is fixedly connected to the top of the housing. A rotating shaft is welded to the output shaft of the drive motor, rotatably connected to the inner wall of the bottom of the valve body. A solenoid is threadedly sleeved on the top of the outer ring of the rotating shaft. Limit plates are welded to either side of the solenoid, and a movable block is welded to the bottom of the limit plates. A cam is welded to the outer ring of the rotating shaft within the valve body. Oil return pipes are welded to both sides of the housing. Oil delivery pipes are fixedly connected to both sides of the valve body. Two movable rods are sleeved on both sides of the valve body. This device has a simple structure and novel design. It can control the flow of oil within the valve body and its flow rate, facilitating transformer testing and improving economic efficiency. It is easy to use and highly practical, making it suitable for widespread adoption.

[0006] Online dissolved gas in oil monitoring system:

[0007] like Figure 4As shown, the online monitoring device for dissolved gas in transformer oil is connected to the transformer 21 via an oil inlet pipe 23 and an oil return pipe 24. The oil inlet pipe 23 is equipped with an oil inlet valve 25, and the oil return pipe 24 is equipped with an oil return valve 26. The transformer oil flows into the online monitoring device for dissolved gas in transformer oil 22 through the oil inlet pipe. The online monitoring device for dissolved gas in transformer oil completes the dissolved gas test in the transformer oil, and the transformer oil flows back to the transformer through the oil return pipe.

[0008] Combining the above patent documents and existing technical solutions, the inventors analyzed and found that the following technical problems exist in the existing technical solutions.

[0009] Due to poor sealing of the transformer oil circuit in the online monitoring device for dissolved gas in oil, air enters the device. The air flows into the transformer body through the oil return pipeline along with the transformer oil. The air entering the transformer gathers at the top of the transformer, causing the main transformer light gas alarm to operate.

[0010] Existing technical problems and considerations:

[0011] How to solve the technical problem of air entering the transformer through the oil return pipe. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide a valve and system for automatically closing the air intake of a transformer oil return pipe, thereby solving the technical problem of air in the oil return pipe entering the transformer.

[0013] In order to solve the above technical problems, the technical solution adopted by the present invention is: a valve for self-closing air intake of a transformer return oil pipeline includes a valve body, an oil chamber in the valve body, a first return oil pipe for oil to enter the oil chamber at the lower part of the valve body, a bell pipe at the bottom of the valve body for oil in the oil chamber to flow out of the valve body, a second return oil pipe on the bell pipe, an oil separator inside the oil chamber for preventing gas in the first return oil pipe from flowing to the bell pipe, a support rod, a float, a guide wheel, a positioning wheel, a self-closing ball and a lead, an air intake port on the upper part of the valve body and an exhaust valve on the air intake port, the oil chamber is connected and communicated with the first return oil pipe, the oil chamber, the bell pipe and the second return oil pipe are connected and communicated in sequence, the oil chamber is connected and communicated with the air intake, the oil separator is connected to the lower part of the oil chamber between the first return oil pipe and the bell pipe, the support rod is connected to the lower part of the oil chamber, the guide wheel and the positioning wheel are connected to the support rod, the self-closing ball is located inside or above the bell pipe, the positioning wheel is located above the bell pipe, one end of the lead is connected to the self-closing ball, and the other end of the lead is connected to the float after passing through the positioning wheel and the guide wheel.

[0014] A further technical solution is that the self-closing ball includes a sphere and a sealing layer coated on the surface of the sphere, the self-closing ball overlaps or separates from the inner wall of the trumpet tube, the trumpet tube is blocked when the self-closing ball overlaps with the inner wall of the trumpet tube, and the trumpet tube is connected when the self-closing ball separates from the inner wall of the trumpet tube.

[0015] A further technical solution is that the sphere of the autism ball is a solid sphere.

[0016] A further technical solution is that the float is a hollow sphere.

[0017] A further technical solution is that the self-closing ball is located on one side of the positioning wheel, and the guide wheel is located on the other side of the positioning wheel.

[0018] A further technical solution is that the sphere of the self-closing ball is a solid sphere made of stainless steel.

[0019] A further technical solution is that the float is a hollow sphere made of stainless steel.

[0020] A further technical solution is that the float is a hollow sphere made of aluminum alloy.

[0021] A system for automatically closing the air intake of a transformer oil return pipeline includes the above-mentioned valve, an online monitoring device for dissolved gas in oil, and a transformer. The transformer is connected to the online monitoring device for dissolved gas in oil through an oil intake pipeline. The oil return pipeline of the online monitoring device for dissolved gas in oil, the first oil return pipeline of the valve, the second oil return pipeline of the valve, and the oil return pipeline of the transformer are connected in sequence.

[0022] A further technical solution is that an oil inlet valve is provided on the oil inlet pipeline, and an oil return valve is provided on the oil return pipeline.

[0023] The beneficial effects of adopting the above technical solution are:

[0024] When oil is pumped out from valve body, the oil inlet of oil pumping out is up-closed, and oil-pipe of oil outlet reaches oil pumping station, and oil-pipe of oil outlet reaches oil pumping station. This technical solution uses the valve body, oil chamber, first oil return pipe, bell pipe, second oil return pipe, oil separator, support rod, float, guide wheel, positioning wheel, self-closing ball, lead, air intake and exhaust valve to discharge the air in the oil return pipe and prevent the air in the oil return pipe from entering the transformer.

[0025] A system for automatically closing the air inlet of a transformer's oil return line includes the aforementioned valve, an online dissolved gas in oil monitoring device, and a transformer. The transformer is connected to the online dissolved gas in oil monitoring device via its oil inlet line. The oil return line of the online dissolved gas in oil monitoring device, the first oil return line of the valve, the second oil return line of the valve, and the oil return line of the transformer are sequentially connected. This technical solution, through the improved valve, online dissolved gas in oil monitoring device, and transformer, allows air to be discharged from the oil return line, preventing air from entering the transformer.

[0026] Please refer to the detailed description of the specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a structural diagram of embodiment 1 of the present invention;

[0028] Figure 2 is a structural diagram of embodiment 2 of the present invention;

[0029] Figure 3 is a structural diagram of embodiment 3 of the present invention;

[0030] Figure 4 It is a connection diagram of the prior art.

[0031] Including: 1 valve body,

[0032] 2 oil chamber,

[0033] 3. First oil return pipe,

[0034] 4 speakers,

[0035] 5. Second oil return pipe,

[0036] 6 Grease separators,

[0037] 7 support rods,

[0038] 8 guide wheels,

[0039] 9 positioning wheels,

[0040] 10 Autism ball,

[0041] 11 air intake,

[0042] 12 exhaust valves,

[0043] 13 stainless steel hollow ball,

[0044] 14 wire rope,

[0045] 15 aluminum alloy hollow ball,

[0046] 16 nylon ropes. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0049] Example 1:

[0050] like Figure 1 As shown, the present invention discloses a valve for self-closing air intake of a transformer return oil pipeline, comprising a valve body 1, an oil chamber 2 in the valve body 1, a first oil return pipe 3 at the lower part of the valve body 1 for oil to enter the oil chamber 2, a bell pipe 4 at the bottom of the valve body 1 for the oil in the oil chamber 2 to flow out of the valve body 1, a second oil return pipe 5 on the bell pipe 4, an oil separator 6 inside the oil chamber 2 for preventing the gas in the first oil return pipe 3 from flowing to the bell pipe 4, a support rod 7, a float, a guide wheel 8, a positioning wheel 9, a self-closing ball 10 and a lead, an air intake port 11 at the upper part of the valve body 1 and an exhaust valve 12 on the air intake port 11, wherein the oil separator 6, the support rod 7, the float, the guide wheel 8, the positioning wheel 9, the self-closing ball 10 and the lead are all located inside the oil chamber 2.

[0051] like Figure 1 As shown, the oil chamber 2 is connected to the first oil return pipe 3, the oil chamber 2, the bell pipe 4 and the second oil return pipe 5 are connected in sequence, the oil chamber 2 is connected to the air intake 11, the oil separator 6 is fixedly connected to the lower part of the oil chamber 2 between the first oil return pipe 3 and the bell pipe 4, the support rod 7 is fixedly connected to the lower part of the oil chamber 2, the guide wheel 8 and the positioning wheel 9 are fixedly connected to the support rod 7, the self-closing ball 10 is located inside or above the bell pipe 4, and the positioning wheel 9 is located above the bell pipe 4.

[0052] like Figure 1 As shown, the lead is a steel wire rope 14 .

[0053] like Figure 1 As shown, one end of the lead wire is connected to the self-closing ball 10, and the other end of the lead wire is connected to the floating ball after passing through the positioning wheel 9 and the guide wheel 8.

[0054] The self-closing ball 10 includes a sphere and a sealing layer covering the surface of the sphere.

[0055] like Figure 1 As shown, the self-closing ball 10 overlaps or separates from the inner wall of the bell tube 4. When the self-closing ball 10 overlaps with the inner wall of the bell tube 4, the bell tube 4 is blocked. When the self-closing ball 10 separates from the inner wall of the bell tube 4, the bell tube 4 is conductive.

[0056] The sphere of the self-closing ball 10 is a solid sphere.

[0057] The float is a hollow sphere.

[0058] like Figure 1 As shown, the self-closing ball 10 is located on one side of the positioning wheel 9, and the guide wheel 8 is located on the other side of the positioning wheel 9.

[0059] The sphere of the self-closing ball 10 is a solid sphere made of stainless steel.

[0060] like Figure 1 As shown, the float is a hollow sphere made of stainless steel, namely, a stainless steel hollow ball 13 .

[0061] The exhaust valve 12 is a manual valve.

[0062] Example 2:

[0063] The difference between Example 2 and Example 1 is that the float is a hollow sphere made of aluminum alloy, namely, the aluminum alloy hollow ball 15 .

[0064] like Figure 2 As shown, the present invention discloses a valve for self-closing air intake of a transformer return oil pipeline, comprising a valve body 1, an oil chamber 2 in the valve body 1, a first oil return pipe 3 at the lower part of the valve body 1 for oil to enter the oil chamber 2, a bell pipe 4 at the bottom of the valve body 1 for the oil in the oil chamber 2 to flow out of the valve body 1, a second oil return pipe 5 on the bell pipe 4, an oil separator 6 inside the oil chamber 2 for preventing the gas in the first oil return pipe 3 from flowing to the bell pipe 4, a support rod 7, a float, a guide wheel 8, a positioning wheel 9, a self-closing ball 10 and a lead, an air intake port 11 at the upper part of the valve body 1 and an exhaust valve 12 on the air intake port 11, wherein the oil separator 6, the support rod 7, the float, the guide wheel 8, the positioning wheel 9, the self-closing ball 10 and the lead are all located inside the oil chamber 2.

[0065] like Figure 2 As shown, the oil chamber 2 is connected to the first oil return pipe 3, the oil chamber 2, the bell pipe 4 and the second oil return pipe 5 are connected in sequence, the oil chamber 2 is connected to the air intake 11, the oil separator 6 is fixedly connected to the lower part of the oil chamber 2 between the first oil return pipe 3 and the bell pipe 4, the support rod 7 is fixedly connected to the lower part of the oil chamber 2, the guide wheel 8 and the positioning wheel 9 are fixedly connected to the support rod 7, the self-closing ball 10 is located inside or above the bell pipe 4, and the positioning wheel 9 is located above the bell pipe 4.

[0066] like Figure 2 As shown, the lead is a steel wire rope 14 .

[0067] like Figure 2 As shown, one end of the lead wire is connected to the self-closing ball 10, and the other end of the lead wire is connected to the floating ball after passing through the positioning wheel 9 and the guide wheel 8.

[0068] The self-closing ball 10 includes a sphere and a sealing layer covering the surface of the sphere.

[0069] like Figure 2 As shown, the self-closing ball 10 overlaps or separates from the inner wall of the bell tube 4. When the self-closing ball 10 overlaps with the inner wall of the bell tube 4, the bell tube 4 is blocked. When the self-closing ball 10 separates from the inner wall of the bell tube 4, the bell tube 4 is conductive.

[0070] The sphere of the self-closing ball 10 is a solid sphere.

[0071] The float is a hollow sphere.

[0072] like Figure 2 As shown, the self-closing ball 10 is located on one side of the positioning wheel 9, and the guide wheel 8 is located on the other side of the positioning wheel 9.

[0073] The sphere of the self-closing ball 10 is a solid sphere made of stainless steel.

[0074] like Figure 2 As shown, the float is a hollow sphere made of aluminum alloy, that is, an aluminum alloy hollow ball 15.

[0075] The exhaust valve 12 is a manual valve.

[0076] Example 3:

[0077] The difference between Example 3 and Example 2 is that the lead wire is a nylon rope 16 .

[0078] like Figure 3 As shown, the present invention discloses a valve for self-closing air intake of a transformer return oil pipeline, comprising a valve body 1, an oil chamber 2 in the valve body 1, a first oil return pipe 3 at the lower part of the valve body 1 for oil to enter the oil chamber 2, a bell pipe 4 at the bottom of the valve body 1 for the oil in the oil chamber 2 to flow out of the valve body 1, a second oil return pipe 5 on the bell pipe 4, an oil separator 6 inside the oil chamber 2 for preventing the gas in the first oil return pipe 3 from flowing to the bell pipe 4, a support rod 7, a float, a guide wheel 8, a positioning wheel 9, a self-closing ball 10 and a lead, an air intake port 11 at the upper part of the valve body 1 and an exhaust valve 12 on the air intake port 11, wherein the oil separator 6, the support rod 7, the float, the guide wheel 8, the positioning wheel 9, the self-closing ball 10 and the lead are all located inside the oil chamber 2.

[0079] like Figure 3As shown, the oil chamber 2 is connected to the first oil return pipe 3, the oil chamber 2, the bell pipe 4 and the second oil return pipe 5 are connected in sequence, the oil chamber 2 is connected to the air intake 11, the oil separator 6 is fixedly connected to the lower part of the oil chamber 2 between the first oil return pipe 3 and the bell pipe 4, the support rod 7 is fixedly connected to the lower part of the oil chamber 2, the guide wheel 8 and the positioning wheel 9 are fixedly connected to the support rod 7, the self-closing ball 10 is located inside or above the bell pipe 4, and the positioning wheel 9 is located above the bell pipe 4.

[0080] like Figure 3 As shown, the lead is a nylon rope 16.

[0081] like Figure 3 As shown, one end of the lead wire is connected to the self-closing ball 10, and the other end of the lead wire is connected to the floating ball after passing through the positioning wheel 9 and the guide wheel 8.

[0082] The self-closing ball 10 includes a sphere and a sealing layer covering the surface of the sphere.

[0083] like Figure 3 As shown, the self-closing ball 10 overlaps or separates from the inner wall of the bell tube 4. When the self-closing ball 10 overlaps with the inner wall of the bell tube 4, the bell tube 4 is blocked. When the self-closing ball 10 separates from the inner wall of the bell tube 4, the bell tube 4 is conductive.

[0084] The sphere of the self-closing ball 10 is a solid sphere.

[0085] The float is a hollow sphere.

[0086] like Figure 3 As shown, the self-closing ball 10 is located on one side of the positioning wheel 9, and the guide wheel 8 is located on the other side of the positioning wheel 9.

[0087] The sphere of the self-closing ball 10 is a solid sphere made of stainless steel.

[0088] like Figure 3 As shown, the float is a hollow sphere made of aluminum alloy, that is, an aluminum alloy hollow ball 15.

[0089] The exhaust valve 12 is a manual valve.

[0090] Example 4:

[0091] The present invention discloses a system for automatically closing the air intake of a transformer oil return pipeline. Based on the device of Example 1, it also includes an online monitoring device for dissolved gas in oil and a transformer. The transformer is connected to the online monitoring device for dissolved gas in oil through an oil inlet pipeline. The oil return pipeline of the online monitoring device for dissolved gas in oil, the first oil return pipe of the valve, the second oil return pipe of the valve and the oil return pipeline of the transformer are connected in sequence.

[0092] An oil inlet valve is fixedly connected to the oil inlet pipeline, and an oil return valve is fixedly connected to the oil return pipeline.

[0093] Example 5:

[0094] The present invention discloses a system for automatically closing the air intake of a transformer oil return pipeline. The system is based on the device of Example 2 and further includes an online monitoring device for dissolved gas in oil and a transformer. The transformer is connected to the online monitoring device for dissolved gas in oil through an oil inlet pipeline. The oil return pipeline of the online monitoring device for dissolved gas in oil, the first oil return pipeline of the valve, the second oil return pipeline of the valve, and the oil return pipeline of the transformer are connected in sequence.

[0095] An oil inlet valve is fixedly connected to the oil inlet pipeline, and an oil return valve is fixedly connected to the oil return pipeline.

[0096] Example 6:

[0097] The present invention discloses a system for automatically closing the air intake of a transformer oil return pipeline. The system is based on the device of Example 3 and further includes an online monitoring device for dissolved gas in oil and a transformer. The transformer is connected to the online monitoring device for dissolved gas in oil through an oil inlet pipeline. The oil return pipeline of the online monitoring device for dissolved gas in oil, the first oil return pipeline of the valve, the second oil return pipeline of the valve, and the oil return pipeline of the transformer are connected in sequence.

[0098] An oil inlet valve is fixedly connected to the oil inlet pipeline, and an oil return valve is fixedly connected to the oil return pipeline.

[0099] Example 7:

[0100] Example 7 is different from Example 1 in that the float is a hollow sphere made of wood, that is, a hollow wooden ball.

[0101] The present invention discloses a valve with self-closing air intake for the oil return pipeline of a transformer, comprising a valve body, an oil chamber in the valve body, a first oil return pipe at the lower part of the valve body for oil to enter the oil chamber, a bell pipe at the bottom of the valve body for oil in the oil chamber to flow out of the valve body, a second oil return pipe on the bell pipe, an oil separator inside the oil chamber for preventing gas in the first oil return pipe from flowing to the bell pipe, a support rod, a float, a guide wheel, a positioning wheel, a self-closing ball and a lead, an air intake port at the upper part of the valve body and an exhaust valve on the air intake port, wherein the oil separator, support rod, float, guide wheel, positioning wheel, self-closing ball and lead are all located inside the oil chamber.

[0102] The oil chamber is connected to the first oil return pipe, the oil chamber, the bell pipe and the second oil return pipe are connected in sequence, the oil chamber is connected to the air intake port, the oil separator is fixedly connected to the lower part of the oil chamber between the first oil return pipe and the bell pipe, the support rod is fixedly connected to the lower part of the oil chamber, the guide wheel and the positioning wheel are fixedly connected to the support rod, the self-closing ball is located inside or above the bell pipe, and the positioning wheel is located above the bell pipe.

[0103] The lead is a steel wire rope.

[0104] One end of the lead is connected to the self-closing ball, and the other end of the lead is connected to the float after passing through the positioning wheel and the guide wheel.

[0105] The self-closing ball comprises a sphere and a sealing layer covering the surface of the sphere.

[0106] The self-closing ball overlaps or separates from the inner wall of the trumpet tube. When the self-closing ball overlaps the inner wall of the trumpet tube, the trumpet tube is blocked. When the self-closing ball separates from the inner wall of the trumpet tube, the trumpet tube is connected.

[0107] The sphere of the autism ball is a solid sphere.

[0108] The float is a hollow sphere.

[0109] The self-closing ball is located on one side of the positioning wheel, and the guide wheel is located on the other side of the positioning wheel.

[0110] The sphere of the self-closing ball is a solid sphere made of stainless steel.

[0111] The float is a hollow sphere made of pine wood, that is, a hollow pine wood ball.

[0112] The exhaust valve is a manual valve.

[0113] The concept of this application:

[0114] Under normal conditions, the interior of the air inlet self-closing valve of the oil return line of the online monitoring device for dissolved gas in transformer oil is filled with transformer oil, and the position sensing ball floats on the top of the air inlet self-closing valve of the oil return line of the online monitoring device for dissolved gas in transformer oil due to buoyancy.

[0115] The self-closing ball is pulled away from the mouth of the trumpet tube by the pulling force of the connecting lead.

[0116] When the oil circuit of the online monitoring device for dissolved gas in transformer oil is poorly sealed and mixed with air, the gas flows into the oil return pipe of the online monitoring device for dissolved gas in transformer oil along the first return oil pipe together with the transformer oil. After stabilizing inside the valve, the gas gathers at the top of the device. As the accumulated gas increases, the oil level drops, the position sensing ball drops, and the self-closing ball drops accordingly until the self-closing ball touches the mouth of the bell pipe. Under the action of its own gravity and the impact force of the transformer oil, the bell pipe mouth and the second return oil pipe are sealed.

[0117] Technical solution description:

[0118] The technical solution of the present application can close the oil return pipeline when the oil circuit of the online monitoring device for dissolved gas in transformer oil is poorly sealed and mixed with air, thereby preventing the mixed air from flowing into the transformer body through the oil return pipeline along with the transformer oil, and the air entering the transformer gathers at the top of the transformer, causing the main transformer light gas alarm to occur.

[0119] like Figure 1As shown, the device in the technical solution of the present application is installed on the oil return pipeline between the online monitoring device for dissolved gas in transformer oil and the transformer.

[0120] The float is a position sensing ball.

[0121] The bottom of the air inlet self-closing valve of the online monitoring device for dissolved gas in oil is connected to the first oil return pipe.

[0122] The top of the air inlet self-closing valve of the online monitoring device for dissolved gas in oil is equipped with an air outlet.

[0123] A support rod is installed in the middle of the air inlet self-closing valve of the online monitoring device for dissolved gas in oil, a guide pulley is installed on the top of the support rod, and a positioning wheel is installed on the right side of the support rod.

[0124] The positioning wheel ensures that when gas is collected inside the online monitoring device for dissolved gas in oil, the self-closing ball can accurately enter the mouth of the bell pipe to realize automatic closure of the air inlet self-closing valve of the online monitoring device for dissolved gas in oil.

[0125] The bell pipe mouth is connected so that the self-closing ball can accurately enter the bell pipe mouth to seal the self-closing valve and the second oil return pipe when the online monitoring device for dissolved gas in oil is intaken.

[0126] An oil separator is set at the bottom of the oil chamber to divide the bottom of the oil chamber into two parts, ensuring that there is a buffer process after the transformer oil flows into the air intake self-closing valve of the online monitoring device of dissolved gas in oil through the first return oil pipe, which is conducive to the air gathering at the top of the air intake self-closing valve of the online monitoring device of dissolved gas in oil, and avoiding direct flow to the bell pipe mouth and the second return oil pipe.

[0127] A self-closing ball is arranged just above the mouth of the horn tube and is connected to a position sensing ball through a lead wire.

[0128] The self-closing ball is a solid metal ball wrapped with a layer of rubber to achieve a good seal with the pipeline.

[0129] The connecting wire between the self-closing ball and the position sensing ball passes through the guide pulley and the positioning wheel.

[0130] The position sensing ball is a hollow metal ball with a density much lower than transformer oil.

[0131] When gas accumulates on the top of the air intake self-closing valve of the online monitoring device for dissolved gas in oil, the oil level drops, and the position sensing ball drops as the liquid level drops, and the self-closing ball also drops, ultimately achieving the sealing of the air intake self-closing valve of the online monitoring device for dissolved gas in oil and the second oil return pipeline.

[0132] like Figure 1 As shown, the trumpet tube 4 is a tube with an inverted trapezoidal longitudinal section, and the shape of the tube is trumpet-shaped.

[0133] like Figure 1As shown, the function of the oil separator 6 includes preventing the oil and gas in the first oil return pipe 3 from flowing to the bell pipe 4. The main purpose of the technical solution of this application is to prevent the gas in the first oil return pipe 3 from flowing to the bell pipe 4.

[0134] After this application has been running internally for a period of time, on-site technicians have reported that it is beneficial in the following ways:

[0135] A device is invented that can monitor the online dissolved gas in transformer oil. When the oil circuit is poorly sealed and air is mixed into the oil return line, the oil return line is closed to prevent the mixed air from flowing into the transformer body through the oil return line along with the transformer oil. The air entering the transformer gathers at the top of the transformer and causes the main transformer light gas alarm to occur.

[0136] When oil is pumped out from valve body, the oil inlet of oil pumping out is up-closed, and oil-pipe of oil outlet reaches oil pumping station, and oil-pipe of oil outlet reaches oil pumping station. It discharges the air in the oil return pipe through the valve body, oil chamber, first oil return pipe, bell pipe, second oil return pipe, oil separator, support rod, float, guide wheel, positioning wheel, self-closing ball, lead, air intake and exhaust valve, etc., to prevent the air in the oil return pipe from entering the transformer.

[0137] A system for automatically closing the air inlet of a transformer's oil return line includes the aforementioned valve, an online dissolved gas in oil monitoring device, and a transformer. The transformer is connected to the online dissolved gas in oil monitoring device via an oil inlet line. The oil return line of the online dissolved gas in oil monitoring device, a first oil return line of the valve, a second oil return line of the valve, and the oil return line of the transformer are sequentially connected. By utilizing the improved valve, online dissolved gas in oil monitoring device, and transformer, the system allows air to be discharged from the oil return line, preventing air from entering the transformer.

[0138] At present, the technical solution of the present invention has been put into pilot production, that is, a smaller-scale test of the product before large-scale mass production; after the pilot production was completed, a user usage survey was carried out on a small scale, and the survey results showed that user satisfaction was high; now preparations have begun for the formal production and industrialization of the product (including intellectual property risk warning surveys).

Claims

1. A self-closing valve for the air inlet of a transformer oil return line, characterized by: The cam is connected to the oil pump sleeve, and the cam is connected to the oil pump sleeve whereby the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the oil in the cam intermittently pushes the 2. The transformer oil return line air inlet self-closing valve according to claim 1, characterized in that: The self-closing ball includes a sphere and a sealing layer coated on the surface of the sphere. The self-closing ball overlaps or separates from the inner wall of the trumpet tube. When the self-closing ball overlaps the inner wall of the trumpet tube, the trumpet tube is blocked. When the self-closing ball separates from the inner wall of the trumpet tube, the trumpet tube is connected.

3. The transformer oil return line air inlet self-closing valve according to claim 2, characterized in that: The sphere of the autism ball is a solid sphere.

4. The transformer oil return line air inlet self-closing valve according to claim 1, characterized in that: The float is a hollow sphere.

5. The transformer oil return line air inlet self-closing valve according to claim 1, characterized in that: The self-closing ball is located on one side of the positioning wheel, and the guide wheel is located on the other side of the positioning wheel.

6. The transformer oil return line air inlet self-closing valve according to claim 3, characterized in that: The sphere of the self-closing ball is a solid sphere made of stainless steel.

7. The transformer oil return line air inlet self-closing valve according to claim 4, characterized in that: The float is a hollow sphere made of stainless steel.

8. The transformer oil return line air inlet self-closing valve according to claim 4, characterized in that: The float is a hollow sphere made of aluminum alloy.

9. A system for automatically closing the air inlet of a transformer oil return line, characterized by: The invention comprises the valve of claim 1, and further comprises an online monitoring device for dissolved gas in oil and a transformer, wherein the transformer is connected to the online monitoring device for dissolved gas in oil through an oil inlet pipeline, and the return oil pipeline of the online monitoring device for dissolved gas in oil, the first return oil pipeline of the valve, the second return oil pipeline of the valve and the return oil pipeline of the transformer are connected in sequence.

10. The transformer oil return line air intake automatic closing system according to claim 9, characterized in that: An oil inlet valve is provided on the oil inlet pipeline, and an oil return valve is provided on the oil return pipeline.

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