Transformer oil drainage device

Abstract

The utility model discloses a transformer oil drainage device, and relates to the technical field of transformers. According to the technical scheme, the transformer oil drainage device comprises the oil drainage valve connector, the connecting pipe and the oil injection valve connector, an oil drainage channel is formed in the oil drainage valve connector, a connecting channel is formed in the connecting pipe, and an oil injection channel is formed in the oil injection valve connector. The oil drain valve connector, the connecting pipe and the oil injection valve connector are connected in sequence, and the oil drain channel, the connecting channel and the oil injection channel are communicated in sequence, when the transformer is used for oil drainage, the oil drain valve connector is connected with an oil drain valve of the transformer in a sealed mode, and the oil injection valve connector is connected with an oil injection valve of the transformer in a sealed mode. A closed circulation channel is formed in the transformer oil drainage device and the transformer oil tank, so that discharged insulating oil can directly return to the oil conservator and does not make contact with the outside, and the risk that the transformer is polluted and leaks during oil drainage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a transformer oil draining device. Background Art

[0002] Oil-immersed transformer is a kind of transformer widely used in power system. Its main function is to increase or decrease AC voltage and realize the transmission and distribution of electric energy. The main feature of oil-immersed transformer is that its core and winding are completely immersed in insulating oil. Oil-immersed transformer has main transformer bushing and oil pillow. Main transformer bushing is also called insulating porcelain bottle. It is an important part of oil-immersed transformer. It is mainly used to fix and insulate winding lead wire when winding lead wire is led out of transformer, so that lead wire keeps a certain distance from oil tank, ground, etc. to prevent short circuit and leakage. In addition, oil pillow is a device on the top of oil-immersed transformer tank. Its main function is to compensate for the volume change of transformer oil caused by temperature change and keep the oil pressure in the tank stable. Oil pillow is connected with transformer tank, and there is a certain amount of surplus space in oil pillow.

[0003] There is a working condition that when the main transformer bushing is aged or damaged and needs to be replaced, it is necessary to release a part of the insulating oil in the transformer tank to lower the oil level in the tank to facilitate the replacement of the bushing. The usual practice is to place a container at the transformer oil drain valve to catch the insulating oil released from the transformer tank, and then inject the insulating oil in the container from the oil filling valve of the oil pillow after the bushing is replaced. In this process, the insulating oil is easily contaminated by external debris and easily leaks, causing environmental pollution. Utility Model Content

[0004] The main purpose of the utility model is to provide a transformer oil draining device, aiming to solve the problem of contamination and leakage risks in transformer oil draining when replacing a bushing.

[0005] To achieve the above-mentioned purpose, the transformer oil draining device proposed in the utility model includes an oil draining valve joint, a connecting pipe and an oil filling valve joint, an oil draining channel is formed in the oil draining valve joint, a connecting channel is formed in the connecting pipe, and an oil filling channel is formed in the oil filling valve joint, the oil draining valve joint, the connecting pipe and the oil filling valve joint are connected in sequence, and the oil draining channel, the connecting channel and the oil filling channel are connected in sequence.

[0006] In one embodiment, the transformer oil drain device also has a flange, which is provided with a mounting hole, one flange is sleeved on the outer wall of the end of the oil drain valve joint away from the connecting pipe, and the other flange is sleeved on the outer wall of the end of the oil filling valve joint away from the connecting pipe.

[0007] In one embodiment, the mounting hole is a strip-shaped through hole, and the strip-shaped through hole extends along the radial direction of the flange.

[0008] In one embodiment, the mounting hole is an arc-shaped through hole, and the arc-shaped through hole extends along the circumference of the flange.

[0009] In one embodiment, a side of the flange facing away from the connecting pipe is provided with an annular groove, and the annular groove extends along the circumference of the flange;

[0010] The transformer oil drain device further comprises a sealing ring, which is accommodated in the annular groove and abuts against the inner wall of the annular groove.

[0011] In one embodiment, the oil drain valve joint includes a first oil receiving pipe, a second oil receiving pipe and a third oil receiving pipe connected in sequence, the first oil receiving pipe has a first oil receiving passage formed therein, the second oil receiving pipe has a second oil receiving passage formed therein, and the third oil receiving pipe has a third oil receiving passage formed therein;

[0012] The first oil receiving passage, the second oil receiving passage and the third oil receiving passage are connected in sequence to form the oil discharge passage, and the second oil receiving passage gradually shrinks along the first oil receiving passage toward the third oil receiving passage;

[0013] The outer wall of the third oil receiving pipe is connected to the wall of the connecting channel, and the third oil receiving channel is communicated with the connecting channel.

[0014] In one embodiment, a first boss is formed on an outer wall of the third connecting pipe, and the first boss abuts against a side wall of the connecting channel.

[0015] In one embodiment, the first boss gradually shrinks in a direction away from the second connecting pipe to form a guiding inclined surface and a clamping plane.

[0016] In one embodiment, the oil filling valve joint has an oil filling pipe, the oil filling channel is formed in the oil filling pipe, and a second boss is provided on the outer wall of the oil filling pipe, and the second boss abuts against the inner wall of the connecting pipe.

[0017] In one embodiment, it is characterized in that the transformer oil discharge device further comprises an oil pump, the oil pump comprises a pump pipe, and an oil pumping channel is formed in the pump pipe;

[0018] The connecting pipe includes a first connecting pipe section, the pump pipe and a second connecting pipe section which are connected in sequence, a first connecting channel is formed in the first connecting pipe section, a second connecting channel is formed in the second connecting pipe section, and the first connecting channel, the pump oil channel and the second connecting channel are connected in sequence to form the connecting channel.

[0019] The technical solution of the utility model is to provide a transformer oil draining device, which includes an oil drain valve joint, a connecting pipe and an oil filling valve joint. An oil drain passage is formed in the oil drain valve joint, a connecting passage is formed in the connecting pipe, and an oil filling passage is formed in the oil filling valve joint. The oil drain valve joint, the connecting pipe and the oil filling valve joint are connected in sequence, and the oil drain passage, the connecting passage and the oil filling passage are connected in sequence. When the transformer is drained by adopting the technical solution, the oil drain valve joint is sealed and connected to the oil drain valve of the transformer, and the oil filling valve joint is sealed and connected to the oil filling valve of the transformer, so that a closed circulation passage is formed in the transformer oil draining device and the transformer oil tank. In this way, the discharged insulating oil can be directly returned to the oil pillow without contacting the outside world, thereby reducing the risk of contamination and leakage of the transformer when draining the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of an embodiment of a transformer oil drain device provided by the utility model;

[0022] Figure 2 for Figure 1 A schematic structural diagram of an embodiment of an oil drain valve connector;

[0023] Figure 3 for Figure 2 A side view of the oil drain valve connector in FIG.

[0024] Figure 4 for Figure 3 A cross-sectional view of the oil drain valve joint along line A-A';

[0025] Figure 5 for Figure 1 A schematic structural diagram of another embodiment of the oil drain valve connector;

[0026] Figure 6 for Figure 1 A structural schematic diagram of another embodiment of the oil drain valve connector;

[0027] Figure 7 for Figure 1 A structural schematic diagram of an embodiment of an oil filling valve connector;

[0028] Figure 8 for Figure 2A schematic structural diagram of another embodiment of the oil drain valve connector.

[0029] Description of Figure Numbers:

[0030] 100. Transformer oil drain device; 1. Oil drain valve joint; 1a. Oil drain channel; 11. First oil receiving pipe; 11a. First oil receiving channel; 12. Second oil receiving pipe; 12a. Second oil receiving channel; 13. Third oil receiving pipe; 13a. Third oil receiving channel; 131. First boss; 1311. Guide slope; 1312. Clamping plane; 2. Connecting pipe; 2a. Connecting channel; 21. First connecting pipe section; 21a. First Communication channel; 22, pump pipe; 22a, pump oil channel; 23, second communication pipe section; 23a, second communication channel; 3, oil filling valve joint; 31, oil filling pipe; 32, second boss; 3a, oil filling channel; 4, flange; 4a, strip through hole; 4b, arc through hole; 4c, annular groove; 4d, circular hole; 5, oil pump; 6, transformer oil tank; 61, oil drain valve; 7, transformer bushing; 8, oil pillow; 81, oil filling valve.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] The utility model provides a transformer oil drain device 100 .

[0036] See also Figure 1 In one embodiment of the utility model, the transformer oil draining device 100 includes an oil drain valve 61 joint 1, a connecting pipe 2 and an oil filling valve 81 joint 3, an oil drain passage 1a is formed in the oil drain valve 61 joint 1, a connecting passage 2a is formed in the connecting pipe 2, and an oil filling passage 3a is formed in the oil filling valve 81 joint 3, the oil drain valve 61 joint 1, the connecting pipe 2 and the oil filling valve 81 joint 3 are connected in sequence, and the oil drain passage 1a, the connecting passage 2a and the oil filling passage 3a are connected in sequence.

[0037] In this embodiment, the two ends of the connecting pipe 2 are respectively sleeved on the oil drain valve 61 joint 1 and the oil filling valve 81 joint 3. Considering that the positions of different transformer oil drain valves 61 and oil filling valves 81 are not the same, in order to be suitable for different transformers and convenient and flexible operation, the connecting pipe 2 adopts a flexible pipe. Further considering that personnel frequently move during oil change working conditions, it is necessary to prevent the connecting pipe 2 from being compressed or collapsed after being stepped on. A flexible pipe with steel wire support or fiber support can be used, such as a fiber reinforced polyurethane hose, a fiber reinforced nylon hose, a steel wire reinforced polyurethane hose, a steel wire reinforced nylon hose, and a steel wire wound resin hose. When the transformer oil drain device 100 is dedicated to a transformer, a rigid pipeline can be selectively used, and the oil drain valve 61 joint 1 and the oil filling valve 81 joint 3 are respectively fixedly connected to the two ends of the rigid pipeline. According to the positions of the transformer oil drain valve 61 and the oil filling valve 81, the positions of the oil drain valve 61 joint 1 and the oil filling valve 81 joint 3 are preset in advance. When in use, the transformer oil drain device 100 is directly connected to the transformer as a whole, which is more convenient and quick. When a flexible pipe is used, in order to enhance the connection strength and sealing between the connector 1 of the oil drain valve 61 and the connector 3 of the oil filling valve 81 and the connecting pipe 2, a pipe clamp or a clamp may be provided on the outer wall of the connecting pipe 2 at the connection.

[0038] The connector 1 of the drain valve 61 is set according to the type of the drain valve 61 on the transformer oil tank 6. When the outlet of the drain valve 61 is provided with an internal thread or an external thread, the drain valve 61 can be provided with a matching external thread or internal thread. When the outlet of the drain valve 61 is provided with a quick connector, the drain valve 61 is provided with a matching quick connector. Usually, the outlet of the drain valve 61 is provided with a flange. Therefore, preferably, a fixed or movable flange matching the flange of the outlet of the drain valve 61 can be provided on the interface of the drain valve 61. When a movable flange is used, a circle of bosses is provided at one end of the interface of the drain valve 61 away from the connecting pipe 2. The movable flange is movably sleeved on the outer wall of the interface of the drain valve 61 and abuts against the side of the boss facing the connecting pipe 2. When the two flanges are tightened by bolts, the movable flange presses the interface of the drain valve 61 against the drain valve 61. The movable flange can be replaced when the flange is aged or damaged. When a fixed flange is used, the fixed flange is fixedly sleeved on the end of the oil drain valve 61 interface away from the connecting pipe 2, and the fixed flange is integrally formed or welded with the oil drain valve 61 connector 1, so that the sealing performance of the connection between the oil drain valve 61 connector 1 and the oil drain valve 61 is stronger. Similarly, the oil filling valve 81 connector 3 can be set with reference to the oil drain valve 61 connector 1, so it will not be repeated.

[0039] The connector 1 of the oil drain valve 61 and the connector 3 of the oil filling valve 81 can be made of metal materials resistant to corrosion by insulating oil, such as copper or stainless steel, or plastic synthetic materials with corrosion resistance and high strength.

[0040] The technical solution of this embodiment is to set up a transformer oil draining device 100, which includes a drain valve 61 joint 1, a connecting pipe 2 and an oil filling valve 81 joint 3. An oil drain channel 1a is formed in the drain valve 61 joint 1, a connecting channel 2a is formed in the connecting pipe 2, and an oil filling channel 3a is formed in the oil filling valve 81 joint 3. The drain valve 61 joint 1, the connecting pipe 2 and the oil filling valve 81 joint 3 are connected in sequence, and the oil drain channel 1a, the connecting channel 2a and the oil filling channel 3a are connected in sequence. When the transformer is drained by adopting this technical solution, the drain valve 61 joint 1 is sealed and connected to the drain valve 61 of the transformer, and the oil filling valve 81 joint 3 is sealed and connected to the oil filling valve 81 of the transformer, so that the transformer oil draining device 100 and the transformer oil tank 6 form a closed circulation channel. In this way, the discharged insulating oil can be directly returned to the oil pillow 8 without contact with the outside world, thereby reducing the risk of contamination and leakage when the transformer is drained.

[0041] For further information, see Figure 1 , Figure 2 and Figure 7In one embodiment of the utility model, the transformer oil drain device 100 also has two flanges 4, each of which is provided with a mounting hole. One flange 4 is sleeved on the outer wall of the end of the oil drain valve 61 connector 1 away from the connecting pipe 2, and the other flange 4 is sleeved on the outer wall of the end of the oil filling valve 81 connector 3 away from the connecting pipe 2.

[0042] In this embodiment, the flange 4 can be movably mounted on the outer wall of the end of the oil drain valve 61 joint 1 away from the connecting pipe 2, or fixedly mounted on the outer wall of the end of the oil drain valve 61 joint 1 away from the connecting pipe 2; similarly, the flange 4 can be movably mounted on the outer wall of the end of the oil filling valve 81 joint 3 away from the connecting pipe 2, or fixedly mounted on the outer wall of the end of the oil filling valve 81 joint 3 away from the connecting pipe 2. When a movable sleeve is used, a circle of bosses is provided at one end of the interface of the drain valve 61 away from the connecting pipe 2, and a circle of bosses is provided at one end of the interface of the filling valve 81 away from the connecting pipe 2. Two movable flanges are respectively movably sleeved on the outer wall of the interface of the drain valve 61 and the outer wall of the interface of the filling valve 81, and abut against one side of the connecting pipe 2 connected to the boss surface. When the two movable flanges 4 are respectively tightened on the drain valve 61 and the filling valve 81 by bolts, one movable flange presses the interface of the drain valve 61 to the drain valve 61, and the other movable flange presses the interface of the filling valve 81 to the filling valve 81. The movable flange can be replaced when the flange is aged or damaged. When a fixed flange is used, a fixed flange is fixedly sleeved on one end of the interface of the drain valve 61 away from the connecting pipe 2, and the other fixed flange is fixedly sleeved on one end of the interface of the filling valve 81 away from the connecting pipe 2. The fixed connection can be achieved by welding or one-piece molding process. In this way, the sealing of the connection between the drain valve 61 joint 1 and the drain valve 61 is stronger.

[0043] For further information, see Figure 5 In one embodiment of the utility model, the mounting hole is a strip-shaped through hole 4a, and the strip-shaped through hole 4a extends radially along the flange 4. In this embodiment, a plurality of strip-shaped through holes 4a are provided on the flange 4, and the number of the strip-shaped through holes 4a matches the number of holes on the flange of the oil drain valve 61 or the oil filling valve 81, and the spacing between each strip-shaped through hole 4a and the adjacent strip-shaped through holes 4a should match the oil drain valve 61 or the oil filling valve 81, and can usually be arranged equidistantly, that is, the angle between the length direction of each strip-shaped through hole 4a and the length direction of another strip-shaped through hole 4a is equal. This embodiment adopts the strip-shaped through holes 4a along the radial direction, which can adapt to the bolt holes on the oil drain valve 61 or the oil filling valve 81 with different distribution radii, so it can be applicable to various types of oil drain valves 61 or oil filling valves 81, expanding the application range of the transformer oil drain device 100.

[0044] For further information, see Figure 6In one embodiment of the utility model, the mounting hole is an arc-shaped through hole 4b, and the arc-shaped through hole 4b extends along the circumference of the flange 4. In this embodiment, the flange 4 is provided with a plurality of arc-shaped through holes 4b. On the premise of ensuring the structural strength, the length and number of the arc-shaped through holes 4b can be lengthened, but the distribution radius of the arc-shaped through holes 4b must be matched with the distribution radius of the bolt holes on the oil drain valve 61 or the oil filling valve 81. In this way, the bolt holes on the oil drain valve 61 or the oil filling valve 81 with different distribution spacings can be adapted, thereby expanding the application scope of the transformer oil drain device 100.

[0045] For further information, see Figure 8 In one embodiment of the utility model, an annular groove 4c is provided on the side of the flange 4 facing away from the connecting pipe 2, and the annular groove 4c extends along the circumference of the flange 4. The transformer oil drain device 100 also has a sealing ring, which is accommodated in the annular groove 4c and abuts against the inner wall of the annular groove 4c.

[0046] In this embodiment, the annular groove 4c can be connected to the oil drain channel 1a, or can be spaced apart from the oil drain channel 1a. When the annular groove 4c is connected to the oil drain channel 1a, the pressure distribution around the oil drain channel 1a is uniform. When the annular groove 4c is spaced apart from the oil drain channel 1a, the medium does not directly contact the sealing ring, which is beneficial to improving the service life of the sealing ring. The cross-sectional shape of the annular groove 4c can be set to a flat bottom, which is convenient for production and processing. In order to improve the sealing performance, the bottom of the groove can also be set to a V-shaped surface or an arc surface. According to the setting of the annular groove 4c, a suitable sealing ring is selected.

[0047] For further information, see Figures 2 to 4 In one embodiment of the utility model, the oil drain valve 61 joint 1 includes a first oil receiving pipe 11, a second oil receiving pipe 12 and a third oil receiving pipe 13 which are connected in sequence. A first oil receiving passage 11a is formed in the first oil receiving pipe 11, a second oil receiving passage 12a is formed in the second oil receiving pipe 12, and a third oil receiving passage 13a is formed in the third oil receiving pipe 13. The first oil receiving passage 11a, the second oil receiving passage 12a and the third oil receiving passage 13a are connected in sequence to form the oil drain passage 1a. The second oil receiving passage 12a gradually shrinks along the first oil receiving passage 11a toward the third oil receiving passage 13a. The outer wall of the third oil receiving pipe 13 is connected to the inner wall of the connecting passage 2a, and the third oil receiving passage 13a is connected to the connecting passage 2a.

[0048] In this embodiment, a flange is fixedly sleeved on the outer wall of the first oil receiving pipe 11. When the oil drain valve 61 or the oil filling valve 81 of the transformer is fixed by a thread, a matching external thread or internal thread can be set on the first oil receiving pipe 11. The inner diameter of the first oil receiving pipe 11 is larger than the inner diameter of the third oil receiving pipe 13. The second oil receiving pipe 12 serves as a transition between the first oil receiving pipe 11 and the third oil receiving pipe 13. The second oil receiving pipe 12 and the third oil receiving pipe 13 can be set to have an outer diameter equal to the outer diameter of the first oil receiving pipe 11 but an inner diameter different from that of the first oil receiving pipe 11. The pipe walls of the second oil receiving pipe 12 and the third oil receiving pipe 13 can also be set to have equal thickness. In this way, the side wall of the second oil receiving pipe 12 is adapted to the second oil receiving channel 12a, and gradually shrinks along the first oil receiving channel 11a toward the third oil receiving channel 13a. The outer diameter of the third oil receiving pipe 13 is smaller than the outer diameter of the laundry oil receiving pipe.

[0049] In this embodiment, the connector 1 of the oil drain valve 61 is arranged to be contracted along the oil outlet direction, so that the insulating oil flows from the large diameter pipe to the small diameter pipe, thereby speeding up the oil outlet flow rate and improving the oil drain efficiency.

[0050] For further information, see Figures 2 to 4 In one embodiment of the utility model, the outer wall of the third oil receiving pipe 13 is formed with a first boss 131, and the first boss 131 abuts against the side wall of the connecting passage 2a. In this embodiment, the connecting pipe 2 is a flexible pipe. When the third oil receiving pipe 13 is inserted into the connecting pipe 2, the first boss 131 partially expands the connecting pipe 2, thereby strengthening the friction between the inner wall of the connecting passage 2a and the outer wall of the third oil receiving pipe 13, and strengthening the connection strength and sealing performance.

[0051] For further information, see Figures 2 to 4 In one embodiment of the utility model, the first boss 131 gradually shrinks in a direction away from the second oil receiving pipe 12, forming a guide slope 1311 and a clamping plane 1312. In this embodiment, the connecting pipe 2 is a flexible pipe. When the third oil receiving pipe 13 is inserted into the connecting pipe 2, the guide slope 1311 plays a guiding role, making it easier to insert the connecting pipe 2.

[0052] After the third oil receiving pipe 13 is inserted into the connecting pipe 2, the first boss 131 squeezes a groove on the inner wall of the connecting channel 2a, and the engaging plane 1312 engages with the inner wall of the groove, so that the third oil receiving pipe 13 is not easy to fall off from the connecting channel 2a, thereby strengthening the connection strength between the third oil receiving pipe 13 and the connecting pipe 2.

[0053] For further information, see Figure 7In one embodiment of the utility model, the oil injection valve 81 connector 3 has an oil injection pipe 31, the oil injection channel 3a is formed in the oil injection pipe 31, and the outer wall of the oil injection pipe 31 is provided with a second boss 32, and the second boss 32 abuts against the inner wall of the connecting pipe 2. In this embodiment, the outer wall of the end of the oil injection pipe 31 away from the connecting pipe 2 is fixedly sleeved with a flange 4, and the outer wall of the end of the oil injection pipe 31 close to the connecting pipe 2 is inserted into the connecting pipe 2 and is provided with a second boss 32. The second boss 32 is provided in the same way as the first boss 131, and can be provided in the same way as the first boss 131, and will not be described in detail here.

[0054] See also Figure 1 In one embodiment of the utility model, the transformer oil discharge device 100 is characterized in that the transformer oil discharge device 100 further comprises an oil pump 5, the oil pump 5 comprises a pump pipe 22, an oil pumping passage 22a is formed in the pump pipe 22, the connecting pipe 2 comprises a first connecting pipe section 21, the pump pipe 22 and a second connecting pipe section 23 connected in sequence, a first connecting passage 21a is formed in the first connecting pipe section 21, a second connecting passage 23a is formed in the second connecting pipe section 23, and the first connecting passage 21a, the oil pumping passage 22a and the second connecting passage 23a are connected in sequence to form the connecting passage 2a. By adding the oil pump 5, the present embodiment improves the efficiency of oil discharge, and can be used for transformers with a large height difference between the oil filling valve 81 and the oil discharge valve 61.

[0055] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A transformer oil drain device, characterized in that: The transformer oil drain device comprises: An oil drain valve connector (1), wherein an oil drain passage (1a) is formed in the oil drain valve connector (1); A connecting pipe (2), wherein a connecting channel (2a) is formed in the connecting pipe (2); and An oil injection valve connector (3), wherein an oil injection channel (3a) is formed in the oil injection valve connector (3); The oil drain valve joint (1), the connecting pipe (2) and the oil filling valve joint (3) are connected in sequence, and the oil drain passage (1a), the connecting passage (2a) and the oil filling passage (3a) are connected in sequence.

2. The transformer oil draining device according to claim 1, characterized in that: The transformer oil drain device also has two flanges (4), each flange (4) being provided with a mounting hole, one flange (4) being sleeved on the outer wall of the end of the oil drain valve joint (1) away from the connecting pipe (2), and the other flange (4) being sleeved on the outer wall of the end of the oil filling valve joint (3) away from the connecting pipe (2).

3. The transformer oil draining device according to claim 2, characterized in that: The mounting hole is a strip-shaped through hole (4a), and the strip-shaped through hole (4a) extends in the radial direction of the flange (4).

4. The transformer oil draining device according to claim 2, characterized in that: The mounting hole is an arc-shaped through hole (4b), and the arc-shaped through hole (4b) extends along the circumference of the flange (4).

5. The transformer oil draining device according to claim 2, characterized in that: An annular groove (4c) is provided on a side of the flange (4) facing away from the connecting pipe (2), and the annular groove (4c) extends along the circumference of the flange (4); The transformer oil drain device also has a sealing ring, which is accommodated in the annular groove (4c) and abuts against the inner wall of the annular groove (4c).

6. The transformer oil draining device according to claim 1, characterized in that: The oil drain valve joint (1) comprises a first oil receiving pipe (11), a second oil receiving pipe (12) and a third oil receiving pipe (13) which are connected in sequence, wherein the first oil receiving pipe (11) is formed with a first oil receiving passage (11a), the second oil receiving pipe (12) is formed with a second oil receiving passage (12a), and the third oil receiving pipe (13) is formed with a third oil receiving passage (13a); The first oil receiving passage (11a), the second oil receiving passage (12a) and the third oil receiving passage (13a) are connected in sequence to form the oil discharge passage (1a), and the second oil receiving passage (12a) gradually contracts along the first oil receiving passage (11a) toward the third oil receiving passage (13a); The outer wall of the third oil receiving pipe (13) is connected to the wall of the connecting channel (2a), and the third oil receiving channel (13a) is in communication with the connecting channel (2a).

7. The transformer oil draining device according to claim 6, characterized in that: A first boss (131) is formed on the outer wall of the third oil receiving pipe (13), and the first boss (131) abuts against the side wall of the connecting channel (2a).

8. The transformer oil draining device according to claim 7, characterized in that: The first boss (131) gradually shrinks in a direction away from the second oil receiving pipe (12), forming a guiding inclined surface (1311) and a clamping plane (1312).

9. The transformer oil draining device according to claim 1, characterized in that: The oil injection valve joint (3) has an oil injection pipe (31), the oil injection channel (3a) is formed in the oil injection pipe (31), and the outer wall of the oil injection pipe (31) is provided with a second boss (32), and the second boss (32) abuts against the inner wall of the connecting pipe (2).

10. The transformer oil draining device according to any one of claims 1 to 9, characterized in that: The transformer oil discharge device also comprises an oil pump (5), the oil pump (5) comprises a pump pipe (22), and an oil pumping passage (22a) is formed in the pump pipe (22); The connecting pipe (2) comprises a first connecting pipe section (21), the pump pipe (22) and a second connecting pipe section (23) which are connected in sequence; a first connecting channel (21a) is formed in the first connecting pipe section (21); a second connecting channel (23a) is formed in the second connecting pipe section (23); the first connecting channel (21a), the pump oil channel (22a) and the second connecting channel (23a) are connected in sequence to form the connecting channel (2a).

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