JP6595301B2 - Conservator - Google Patents

Description

  The present invention relates to a conservator for a transformer.

  In a transformer, in order to cool a voltage conversion device such as a coil, the transformer may be filled with insulating oil. In this case, the transformer is provided with a conservator that absorbs the volume change (expansion and contraction) of the insulating oil accompanying the temperature change of the voltage conversion device while preventing the deterioration of the insulating oil due to contact with air.

  For example, Patent Document 1 discloses a conservator for a transformer mounted on a vehicle, and a metal bellows is employed in this conservator.

Japanese Utility Model Publication No. 63-134515

  By the way, when a transformer is mounted on a moving body such as a vehicle or a ship, the transformer swings with the moving body or the transformer receives an impact. For this reason, when a conservator including a metal bellows is provided in a transformer mounted on a moving body, the metal bellows is suddenly displaced with the swing of the transformer and the impact on the transformer. However, since the metal bellows is formed by welding a plurality of thin ring-shaped plates alternately between the inner peripheral edges and the outer peripheral edges, it is desirable to avoid such a sudden displacement.

  Therefore, an object of the present invention is to provide a conservator that is resistant to swinging of a transformer and shock to the transformer.

  In order to solve the above problems, a conservator of the present invention includes a cylindrical case protruding from a transformer, a lid attached to the case, a metal bellows having one end fixed to the lid, and the metal bellows. An operation plate that is fixed to the other end of the case and partitions the internal space of the case into an air chamber inside the metal bellows and an insulating oil chamber outside the metal bellows, and an air passage that communicates the air chamber with the atmosphere. And an orifice provided in the air passage.

  According to the above configuration, the orifice functions as a damper that restricts the air flow in the air passage when the operating plate suddenly moves when the transformer swings or when the transformer receives an impact. . As a result, since the movement of the operation plate is limited by the air pressure in the air chamber, it is possible to suppress the metal bellows from being suddenly displaced due to the swing of the transformer and the impact on the transformer. Therefore, it is possible to obtain a conservator that is resistant to the swinging of the transformer and the impact on the transformer.

  The air passage may include at least two pipes, and the orifice may be formed on a baffle plate sandwiched between flanges provided on the two pipes. According to this configuration, an orifice can be easily added to existing equipment.

  According to the present invention, it is possible to obtain a conservator that is resistant to the swinging of the transformer and the impact on the transformer.

It is sectional drawing of the conservator which concerns on one Embodiment of this invention.

  FIG. 1 shows a conservator 1 according to an embodiment of the present invention. The conservator 1 is provided in the transformer 11. The transformer 11 includes a shell 12 that houses a voltage conversion device such as a coil, and the shell 12 is filled with an insulating oil 15. The insulating oil 15 is preferably flame retardant, and for example, silicon oil is used as the insulating oil 15.

  Specifically, the conservator 1 includes a cylindrical case 2 that protrudes upward from the transformer 11 and a lid 3 attached to the case 2. An opening 13 is provided in the shell 12 of the transformer 11, and the internal space 21 of the case 2 communicates with the internal space of the shell 12 through the opening 13.

  A flange is provided at the upper end of the case 2, and the lid 3 is fixed to the flange. That is, the lid 3 covers the internal space 21 of the case 2 from above.

  A metal bellows 4 is disposed in the case 2. One end (upper end) of the metal bellows 4 is fixed to the lid 3, and an operation plate 45 is fixed to the other end (lower end) of the metal bellows 4.

  The operation plate 45 partitions the internal space 21 of the case 2 into an air chamber 22 inside the metal bellows 4 and an insulating oil chamber 23 outside the metal bellows 4. The insulating oil chamber 23 is filled with the insulating oil 15. The air chamber 22 is communicated with the atmosphere by the ventilation path 5.

  In the present embodiment, the air passage 5 extends from the air chamber 22 to the breather 8. More specifically, the air passage 5 includes a hole 31 provided in the lid 3 that communicates with the air chamber 22, and two pipes 51 that connect the hole 31 and the breather 8. The breather 8 is a breathable container in which a hygroscopic agent is disposed. The number of pipes 51 may be three or more.

  Further, in the present embodiment, an orifice 6 is provided in the air passage 5. More specifically, a baffle plate 7 is sandwiched between flanges provided in the two pipes 51 described above, and an orifice 6 is formed in the baffle plate 7.

  As described above, in the conservator 1 according to the present embodiment, the orifice 6 is provided in the air passage 5, so that the operation plate 45 when the transformer 11 swings or the transformer 11 receives an impact. If the valve 6 moves suddenly, the orifice 6 functions as a damper that restricts the air flow in the air passage 5. As a result, since the movement of the operation plate 45 is restricted by the air pressure in the air chamber 22, it is possible to suppress the metal bellows 4 from being suddenly displaced due to the swing of the transformer 11 and the impact to the transformer 11. Therefore, it is possible to obtain the conservator 1 that is resistant to the swing of the transformer 11 and the shock to the transformer 11.

  In particular, since a large impact occurs in a ship such as an icebreaker, if the transformer 11 mounted in such a ship is provided with the conservator 1 of the present embodiment, the conservator 1 is used for a long period of time. Can be protected from damage.

(Modification)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, the baffle plate 7 may be omitted and the orifice 6 may be formed in the lid 3. However, if the orifice 6 is formed in the baffle plate 7 as in the above embodiment, the orifice 6 can be easily added to the existing equipment. Alternatively, when the orifice 6 is formed in the lid 3, the air passage 5 may be composed of only the orifice 6.

DESCRIPTION OF SYMBOLS 1 Conservator 11 Transformer 15 Insulating oil 2 Case 21 Internal space 22 Air chamber 23 Insulating oil chamber 3 Lid 4 Metal bellows 45 Actuation plate 5 Ventilation channel 51 Piping 6 Orifice 7 Baffle plate

Claims (2)

A cylindrical case protruding from the transformer;
A lid attached to the case;
A metal bellows having one end fixed to the lid;
An operation plate fixed to the other end of the metal bellows and partitioning the internal space of the case into an air chamber inside the metal bellows and an insulating oil chamber outside the metal bellows;
An air passage communicating the air chamber with the atmosphere;
An orifice provided in the air passage , with both ends always open ;
Conservator with. The vent path includes at least two pipes;
The conservator according to claim 1, wherein the orifice is formed in a baffle plate sandwiched between flanges provided in the two pipes.

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