JPS5828364Y2 - rectifier stack - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rectifier stack used in large current rectifiers and the like.

Conventionally, the rectifier stack used in large current rectifiers is
As shown in the figure, a flat rectifying element 1 made of a diode or SIRISK, a cooling piece 2, and an insulating spacer 3 are stacked in multiple stages and are pressed together using a pressure contact mechanism 4 or the like.

It was installed so that the direction of arrow a was upward.

In the conventional rectifier stack configured as described above, when the rectifier fails or when the rectifier needs to be replaced, conventionally, a ramper 30 is used as shown in FIGS. 2 and 3. However, a method has been adopted in which a portion of the cooling piece 2 is disposed so that its upper side comes into contact with the lower side of the cooling piece 2 placed above the rectifying element 1, and is attached to the insulating bolt 5.

When the clamping mechanism of the pressure-welded stacked body is loosened using this method,
A cooling piece arranged below the rectifying element 1 to prevent the stacked body of the insulating spacer 3, the rectifying element 1, the cooling piece 2, etc. arranged above the cooling element 2 from shifting downward;
Only the insulating spacer, rectifying element, etc. are shifted downward, and the gap that occurs between the upper surface of this rectifying element 1 and the surface of the cooling piece 2 placed above this rectifying element 1 that contacts the rectifying element 1 is removed. It was used to exchange old and new rectifying elements.

Note that the insulating bolt 5 may be used to attach the rectifier stack directly to the conductor, or may be installed insulated from the conductor, but live parts such as the cooling piece, the connecting conductor connected to it, and the rectifier element are exposed. In order to ensure electrical safety, insulated bolts, which are metal bolts whose surfaces are covered with an insulating material, have been used to ensure electrical safety.

However, in such a conventional structure, when replacing the rectifying element as described above, the insulating bolt, which is a component of the pressure welding mechanism, is used to attach the clamper to it, so there is a risk of damaging the surface of the insulating bolt ( There was a risk that the insulation properties of the insulating bolt would deteriorate by causing damage such as cracking or cracking.

In addition, it is unavoidable that there is a slight gap between the insulating bolt and the surface of the clamper that contacts the insulating bolt, and there is also a limit to the frictional force between the insulating bolt and the clamper, so the rectification In the case of a rectifier stack with a large number of elements, it may not be possible to support the falling rectifiers, cooling pieces, insulating spacers, etc. placed above the rectifier to be replaced, so it is difficult to replace the rectifiers correctly. However, it was not possible to do so, and it had such drawbacks.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to provide a rectifier stack in which the rectifier elements can be reliably replaced without damaging the insulating bolts.

This invention will be explained below with reference to an embodiment shown in FIGS. 4 and 5.

The apparatus 10 for replacing rectifying elements is as shown in FIG.
It is installed between the cooling pieces 2 placed above and below the rectifying element 1 to be replaced, and includes a left-handed threaded bolt 13 having an insertion part 11 at one end and a left-handed threaded part 12 at the other end, and an insertion part 14 at one end. Right-handed threaded bolt 1 having a right-handed threaded portion 15 at the other end
6, and a nut 19 having a left-hand female thread 17 and a right-hand threaded portion 18 at its ends, respectively, to connect the left-hand threaded bolt 13 and the right-hand threaded bolt 16.

The insertion portions 11 and 14 of the left-hand threaded bolt 13 and the right-hand threaded bolt 16 are on a line passing approximately through the center of the rectifier contact surface 7 of the cooling pieces 2, 2, and are approximately symmetrical with respect to the center point of the rectifier contact surface 7. The hole 21 is designed to be inserted into a hole 21 provided at a position such as a square hole shown or an oval hole not shown to prevent the left-hand threaded bolt 13 and right-hand threaded bolt 16 from rotating. It has a cross-sectional shape other than a perfect circle, and is designed to have a size such that each threaded portion does not fit into the corresponding hole 21.

With the above-mentioned configuration, this device has the above-mentioned configuration, and when replacing the rectifying element, first, as shown in Fig. 4, the left Threaded bolt 13, right-handed threaded bolt 16, and nut 1
Assemble 9.

When the pressure contact mechanism (not shown in FIG. 4) is loosened and the nut 19 is rotated to extend the entire length of the device 10, which is an assembly of the left-hand threaded bolt 13, the right-hand threaded bolt 16, and the nut 19, the cooling piece The distance between the rectifying elements 1 and the cooling piece 2 increases, and the contact between the rectifying element 1 to be replaced and the cooling piece 2 is released, and the rectifying element 1 can be taken out.

To incorporate a new rectifying element, it is sufficient to perform operations in almost the reverse order as described above.

Insertion parts 1 for left-hand threaded bolts 13 and right-hand threaded bolts 16
1.14 and the hole 21 provided in the cooling piece 2, the nut 1
When turning 5, follow this and tighten the left-hand threaded bolt 13.
This acts to prevent the right-hand threaded bolt 16 from rotating, in other words to obtain a reaction force against the rotation of the nut 19.

If the hole 21 and the insertion portion 11.14 have a shape other than a perfect circle, such as an ellipse or a half-moon shape, they can function in the same manner as described above.

In addition, left threaded bolt 13, right threaded bolt 16 and nut 1
9 is not required during normal operation and can be removed, but it can be easily removed as described above.

Therefore, according to this invention, there is no need to worry about insulation bolts, so it is safe without reducing the insulation performance of the rectifier stack.
The rectifying element can be replaced reliably.

Further, in the above embodiment, the tightening mechanism of the rectifying stack is disposed below, but the same effect as described above can be obtained even if it is disposed upward or horizontally.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional rectifying stack, Fig. 2 is a detailed view of the area around the rectifying element of the conventional rectifying stack, Fig. 3 is a cross-sectional view taken along line II-II in Fig. 2, and Fig. 4 is a sectional view of the conventional rectifying stack. FIG. 5 is a detailed view of the vicinity of the rectifying elements of the rectifying stack of one embodiment of the rectifying stack according to the invention, and FIG. 5 is a plan view of only the cooling piece in FIG. 4. 1... Flat rectifying element, 2... Cooling piece,
3... Insulating spacer, 4... Tightening mechanism, 5... Insulating bolt, 6... Insulating pipe, 7... Rectifying element Contact surface, 11.14...
...Insertion part, 12...Left threaded part, 13...
...Left thread bolt, 16...Right thread bolt,
17... Left female screw, 18... Right female screw, 19... Nut, 21... Square hole, 3
0... Clamper 31... Screw.

Claims (1)

[Scope of utility model registration request] A flat rectifying element, a cooling piece disposed in contact with an electrode surface of the flat rectifying element, an insulating spacer disposed between the cooling pieces, and the flat rectifying element, the cooling piece, and the insulating spacer stacked in multiple stages. In a rectifying stack consisting of a tightening mechanism that presses and tightens all at once, the first cooling piece has a hole with a cross-sectional shape other than a perfect circle, and a cross-section that is inserted into this hole and does not allow rotation. a bolt having a shaped insertion portion at one end and a left-handed threaded portion at the other end; a hole having a cross-sectional shape other than a perfect circle provided in a second cooling piece disposed opposite to the first cooling piece; A right-handed threaded bolt that is inserted into this hole and has a cross-sectional insertion part that does not allow rotation at one end and a right-handed threaded part at the other end, and a left-handed threaded bolt at one end to connect the left-handed threaded bolt and the right-handed threaded bolt. A rectifier stack comprising a nut having a right-handed thread at the other end.