Combined type oil injection connector

Abstract

The utility model discloses a combined oil injection joint which comprises a shell assembly and is characterized by further comprising a connecting plate and a connecting disc, the connecting disc is fixedly arranged at one end of the shell assembly, the connecting plate is rotatably connected to an oil injection valve through threads, and the connecting plate and the connecting disc are detachably connected together through a connecting piece; a second threaded through hole is formed in the connecting plate, a third threaded through hole is formed in the connecting plate, and the connecting piece is a tightening bolt; when the connecting plate is connected with the connecting disc, the connecting plate and the connecting disc are connected together by utilizing a tightening bolt to sequentially pass through the second threaded through hole of the connecting plate and the third threaded through hole of the connecting disc. During installation, only the connecting plate needs to be rotated for axial moving connection, then the shell assembly with the connecting disc is connected to the connecting plate, overall rotating connection along the central axis of an oil injection valve of the transformer oil tank is not needed, and the phenomenon of interference with peripheral oil tank oil pipes and plate ribs in the installation process is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer auxiliary equipment, in particular to a combined oil injection joint. Background Art

[0002] Generally, after the transformer is assembled, insulating oil needs to be injected into the transformer oil tank 14 under a vacuum environment. Figure 1 and Figure 2 As shown, the transformer oil tank 14 is provided with an oil filling valve 12, but the oil filling pipe 13 needs to be connected to the oil filling valve 12 of the transformer oil tank 14, and an oil filling connector 11 needs to be threadedly installed on the oil filling valve 12. However, there are other oil tank oil pipes and ribs around the oil filling valve 12 of the transformer oil tank 14. In the case of interference from the surrounding oil tank oil pipes and ribs, the oil filling connector 11 cannot be rotated as a whole and threadedly installed on the oil filling valve 12 of the transformer oil tank 14. The quick connector 6 and the ball valve 8 need to be removed before the remaining shell assembly 3 of the oil filling connector 11 can be installed on the oil filling valve 12 of the transformer oil tank 14. After installing this part of the shell assembly 3, the quick connector 6 and the ball valve 8 are reinstalled on the shell of the oil filling connector 11. This operation is cumbersome and can easily cause the seal to fail and oil leakage. Therefore, it is necessary to provide an oil filling connector that can prevent interference with the surrounding oil tank oil pipes and ribs during the connection process with the oil filling valve 12 of the transformer oil tank 14.

[0003] The applicant applied for the following patents in 2018, which are listed here:

[0004] The Chinese utility model patent with authorization announcement number "CN207800326U" and publication date on August 13, 2018 discloses a transformer oil filling tool, such as Figure 3 As shown, it comprises a hollow housing and a quick connector that seals the housing. One end of the housing is provided with a connection for sealingly connecting to the transformer's oil filling valve. A movable guide rod is sealed and mounted on the other end. One end of the guide rod is located within the housing's inner cavity and has a square head that can enter the square hole in the transformer's oil filling port plug. The other end of the guide rod is located outside the housing and has a connector for connecting to a screwing tool. This simple structure facilitates operator use, reduces the workspace required for oil filling, meets the needs of various working environments and equipment, improves applicability, and simplifies production processes, effectively preventing oil leaks and extending service life.

[0005] However, the transformer oil filling fixture in the patent document is connected to the external thread of the oil filling valve through the internal thread of its interface. There will still be interference with the surrounding oil tank oil pipes and ribs, and the oil filling joint cannot be rotated and installed on the oil filling valve as a whole. The quick connector and the ball valve need to be removed before the remaining shell assembly of the oil filling joint can be installed on the oil filling valve of the transformer. After installing this part of the shell assembly, the quick connector and the ball valve are reinstalled on the shell of the oil filling joint. The operation is cumbersome and easily causes the problem of seal failure and oil leakage. Therefore, the above-mentioned transformer oil filling fixture will still cause interference with the surrounding oil tank oil pipes and ribs.

[0006] In summary, how to design an oil filling joint so that it can prevent interference with the surrounding oil tank pipes and ribs during the connection process with the transformer oil filling valve is a technical problem that needs to be solved urgently. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a combined oil filling joint for the defects existing in the prior art, so that when connecting it with the oil filling valve of the transformer oil tank, interference with the surrounding oil tank oil pipes and ribs can be prevented.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a combined oil filling joint, including a housing assembly, and also including a connecting plate and a connecting disk, the connecting disk is fixed on one end of the housing assembly, the connecting plate is connected to the oil filling valve by a threaded rotation, and the connecting plate and the connecting disk are detachably connected together by a connecting piece; a second threaded through hole is provided on the connecting plate, a third threaded through hole is provided on the connecting plate, and the connecting piece is a tightening bolt; when the connecting plate and the connecting disk are connected, the tightening bolt is used to connect the connecting plate and the connecting disk together through the second threaded through hole of the connecting plate and the third threaded through hole on the connecting disk in sequence.

[0009] Furthermore, the shell assembly has a first opening portion, which has a thread; the combined oil filling joint also includes an elbow, which is an L-shaped through pipe and has threads at both ends. The thread at one end of the elbow is adapted to be tightened with the thread of the first opening portion of the shell assembly, and the thread at the other end of the elbow is adapted to be tightened with the quick connector.

[0010] Furthermore, the second threaded holes are distributed at equal distances along a circumference of the first threaded through hole, and the second threaded through hole is coaxially arranged with the first threaded through hole.

[0011] Furthermore, two protrusions are provided on the outer peripheral surface of the connecting plate, and the two protrusions are symmetrically distributed on both sides of the connecting plate with respect to the central axis of the connecting plate.

[0012] Furthermore, the third threaded through holes are arranged at equal distances along a circumference of the coupling plate.

[0013] Furthermore, an annular sealing gasket is provided between the connecting plate and the connecting disc.

[0014] Furthermore, an O-ring is provided between the connecting plate and the oil filling valve.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: when installing, the present invention does not need to adopt the structure of the oil filling joint rotating as a whole for installation as in the prior art, but only needs to rotate the connecting plate independently, and then connect the shell assembly with the connecting plate to the connecting plate, so that the area formed by the rotation of the connecting plate is much smaller than the area formed by the overall rotation of the oil filling joint in the prior art; and the second threaded through hole on the circumference of the connecting plate and the third threaded through hole on the circumference of the connecting plate are tightened with the tightening bolt to form an axially movable connection, which does not require overall rotation along the central axis of the oil filling valve of the transformer tank. The rotary connection effectively avoids interference with the surrounding oil tank oil pipes and plate reinforcements during installation; the combined oil filling joint is also provided with threaded elbows at both ends, the thread at one end of the elbow is adapted to the thread of the first opening of the shell assembly for tightening, and the thread at the other end of the elbow is adapted to the quick connector for tightening, so that the elbow and the quick connector are connected to the shell assembly, and the direction of the elbow can be adjusted to a certain limit, and the direction of the quick elbow can be adjusted within a certain limit. For example, when the quick connector interferes with the surrounding oil tank oil pipes and plate reinforcements during installation, the direction of the quick connector can be adjusted by using the elbow to further avoid such interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a transformer oil tank and oil filling valve in the prior art;

[0017] Figure 2 This is a connection diagram of a transformer tank oil filling valve, an oil filling joint, and an oil filling pipe in the prior art;

[0018] Figure 3 This is a schematic diagram of the oil filling joint structure in the prior art;

[0019] Figure 4 A top view of a connecting plate according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic structural diagram of a combined oil filling joint according to an embodiment of the present utility model;

[0021] Figure 6 This is a schematic structural diagram of a combined oil filling joint according to an embodiment of the present utility model;

[0022] In the figure: 1. Connecting plate, 101. First threaded through hole, 102. Second threaded through hole, 103. Bump, 2. Connecting plate, 201. Third threaded through hole, 3. Housing assembly, 301. First opening, 4. Annular sealing gasket, 5. Elbow, 6. Quick connector, 7. Tightening bolt, 8. Ball valve, 9. Guide rod, 10. Sealing end cap, 11. Oil filling connector, 12. Oil filling valve, 13. Oil filling pipe, 14. Transformer oil tank, 15. O-ring. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions and advantages of the embodiment of the present invention clearer, the following will be combined with the appended drawings of the embodiment of the present invention to Figure 4-6 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention. Example

[0024] like Figure 5 、 Figure 6 As shown, the combined oil filling joint of the present application mainly includes a connecting plate 1, a connecting disc 2, a shell assembly 3, an annular sealing gasket 4, an elbow 5 and a quick connector 6, and tightens the screw 7; the connecting disc 2 is fixed on one end of the shell assembly 3, and the connecting plate 1 is connected to the oil filling valve 2 by threaded rotation. The connecting plate 1 and the connecting disc 2 can be disassembled and connected together by tightening the bolt 7.

[0025] like Figure 4 As shown, the connecting plate 1 has a first threaded through-hole 101, several second threaded through-holes 102, and two protrusions 103. The first threaded through-hole 101 is located at the center of the connecting plate 1, and the several second threaded through-holes 102 are located at the periphery of the first threaded through-hole 101. The several second threaded through-holes 102 are arranged in a full circle along the circumference. The two protrusions 103 are symmetrically distributed on either side of the connecting plate 1 about the central axis.

[0026] like Figure 6As shown, when connecting the combined oil filling joint, the connecting plate 1 is connected to the oil filling valve 12 of the transformer tank 11. When installing the connecting plate 1, the O-ring 15 is tightly fitted onto the oil filling valve 12 of the transformer tank 11. The internal thread of the first threaded through hole 101 of the connecting plate 1 is then aligned with the external thread of the oil filling valve 12 of the transformer tank 11, and the connecting plate 1 is rotated and tightened. After the operation is completed, the O-ring 15 is pressed against the oil filling valve 12 using the connecting plate 1, ensuring a good seal between the connecting plate 1 and the oil filling valve 12 of the transformer tank 11. During the tightening process, two protrusions 103 are provided on the outer circumference of the connecting plate 1. During tightening, the two protrusions 103 are rotated using a tool or manually to tighten the connecting plate 1, thereby tightening the connecting plate 1 to the oil filling valve 12 of the transformer tank 11. This makes it easier to tighten the connecting plate 1 to the oil filling valve 12 of the transformer tank 11. During the process of connecting the connecting plate 1 to the oil filling valve 12 of the transformer oil tank 11, the area formed by the rotation of the connecting plate 1 along the axis of its first threaded through hole 101 is small, so that during the rotation and tightening process, the interference area with the surrounding oil tank oil pipes and plate reinforcements is small. In the prior art, the area formed by the overall rotation of the oil filling joint 13 is larger, which effectively avoids the interference with the surrounding oil tank oil pipes and plate reinforcements during the installation process.

[0027] like Figure 4 、 Figure 5 As shown, the coupling plate 2 is welded to one end of the housing assembly near the interface of the oil filling valve 12 of the transformer tank 11. A number of third threaded through-holes 201 are provided at equal intervals along the circumference of the coupling plate 2. The coupling plate 1 also has eight second threaded through-holes 102, which are evenly spaced around the first threaded through-holes 101 of the coupling plate 1 and oriented in the same direction as the first threaded through-holes 101. The second threaded through-holes 102 on the coupling plate 1 correspond in position to the third threaded through-holes 201 on the coupling plate 2 and have the same radius.

[0028] like Figure 5 、 Figure 6 As shown, the tightening bolt 7 and the second threaded through hole 102 of the connecting plate 1 are adapted to the third threaded through hole 201 on the connecting plate 2. When the connecting plate 2 and the housing assembly 3 are connected to the connecting plate 1 as a whole, the annular sealing gasket 4 is placed between the connecting plate 2 and the connecting plate 11 and then tightened by tightening the bolt 7. The tightening bolt 7 passes through the second threaded through hole 102 of the connecting plate 1 and the third threaded through hole 201 on the connecting plate 2 in sequence, thus connecting the connecting plate 2 and the housing assembly 3 as a whole to the connecting plate 1. In this way, the annular sealing gasket 4 further enhances the sealing performance here.

[0029] During this installation process, the second threaded through hole 102 on the circumference of the connecting plate 1 and the third threaded through hole 201 on the circumference of the connecting disc 2 are tightened with the tightening bolts 7 to form an axially movable connection. There is no need to rotate the oil filling valve 12 of the transformer oil tank 11 as a whole along the central axis. This will further significantly reduce the interference area with the surrounding oil tank oil pipes and plate reinforcements.

[0030] like Figure 6 As shown, the elbow 5 is an L-shaped through pipe with threads at both ends. The threads at one end of the elbow 5 are adapted to and tightened with the threads of the first opening of the housing assembly 3, and the threads at the other end of the elbow 5 are adapted to and tightened with the quick connector 6, thereby connecting the elbow 5 and the quick connector 6 to the housing assembly 3. The elbow 5 can be adjusted in direction to a certain extent, and the direction of the quick connector 6 can be adjusted within a certain limit. For example, when the quick connector 6 interferes with the surrounding fuel tank pipes or plate reinforcement during installation, the elbow 5 can be used to adjust the direction of the quick connector 6 to further avoid such interference.

[0031] It should be noted that in the above embodiment, the inner diameter of the annular sealing gasket 4 is close to the inner diameter of the first threaded through hole of the connecting plate 1 and the outer periphery of the annular sealing gasket 4 cannot block the second threaded through hole 102. This arrangement ensures the overall sealing of the combined oil filling joint.

[0032] In addition, in order to ensure the vacuum conditions during the oil filling process, in the above embodiment, the combined oil filling joint is connected during the connection process, and the relevant threaded connections, bolt connections, etc. are all connected with sealing rings (or other sealing members); the limitation on the number is only a preferred number, and the limitation on the direction is only set for a clearer description.

[0033] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of protection of the present invention, and the scope of protection of the present invention should be defined by the claims.

Claims

1. A combined oil filling joint, comprising a housing assembly, characterized in that: The invention also includes a connecting plate and a connecting disc, wherein the connecting disc is fixed on one end of the housing assembly, the connecting plate is connected to the oil filling valve by means of a threaded rotation, and the connecting plate and the connecting disc are detachably connected together by a connecting piece; a second threaded through hole is provided on the connecting plate, a third threaded through hole is provided on the connecting disc, and the connecting piece is a tightening bolt; when the connecting plate and the connecting disc are connected, the tightening bolt is used to sequentially pass through the second threaded through hole of the connecting plate and the third threaded through hole on the connecting disc to connect the connecting plate and the connecting disc together.

2. The combined oil filling joint according to claim 1, characterized in that: The shell assembly has a first opening portion, which has a thread; the combined oil filling joint also includes an elbow, which is an L-shaped through pipe and has threads at both ends. The thread at one end of the elbow is adapted to be tightened with the thread of the first opening portion of the shell assembly, and the thread at the other end of the elbow is adapted to be tightened with the quick connector.

3. The combined oil filling joint according to claim 2, characterized in that: The connecting plate has a first threaded through hole, through which the connecting plate is rotatably connected to the oil filling valve, and the second threaded through holes are distributed at equal distances around the first threaded through hole, and the second threaded through holes are coaxially arranged with the first threaded through hole.

4. The combined oil filling joint according to claim 1, 2 or 3, characterized in that: Two protrusions are provided on the outer peripheral surface of the connecting plate, and the two protrusions are symmetrically distributed on both sides of the connecting plate with respect to the central axis of the connecting plate.

5. The combined oil filling joint according to claim 4, characterized in that: The third threaded through holes are arranged at equal distances along a circumference of the coupling plate.

6. The combined oil filling joint according to claim 1, characterized in that: An annular sealing gasket is provided between the coupling plate and the coupling disc.

7. The combined oil filling joint according to claim 1, characterized in that: An O-type sealing ring is provided between the connecting plate and the oil filling valve.

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