JPS6112684Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembly structure of a power rectifier stack, and more particularly to an integral assembly structure of a flat diode or thyristor, cooling fins thereof, and a CR circuit for protecting the elements.

Generally, in AC/DC converters or orthogonal converters for power using semiconductor elements, a flat element (a flat diode or a flat thyristor) as a semiconductor element and cooling fins made of a material with excellent thermal conductivity are alternately used. Stacked and tightened together (stack)
The stack has an assembly structure in which the stacks are arranged in parallel for the number of AC phases. In this case, since the cooling fins play the role of cooling as well as the role of electrodes, it is necessary to consider the insulation between the cooling fins of different phases, and the same polarity (DC side). There are restrictions such as the fact that the cooling fins corresponding to the positive or negative electrodes must be disposed close to each other and connected. As a result, the stack structure becomes complicated, and moreover, expensive insulating members are used, making the entire stack expensive. This will be explained in more detail using FIG. FIG. 1 shows a conventional thyristor stack connected in a single-phase bridge. The flat thyristors 1 and 2 and their cooling fins 3, 4, and 5, which also serve as lead conductors, are stacked alternately, and an insulating spacer 6 is placed on the side of the cooling fin 3.
The cooling fins 5 are pressed together by a stud bar 8 via the mounting bracket 7A, and the cooling fin 5 side is pressed by an insulating spacer 9 with an alignment seat and a set of two leaf springs 10.
These insulating spacers 6, 9, stud bars 8, and leaf springs 10 are attached to the holding brackets 3A, 3B, 4A, 4B, 5A, 5 provided on both sides of the cooling fins 3-5.
The stud bolts 8A and 8B that pass through B constitute a fastening metal fitting, and this fastening metal fitting is tightened and fixed at a specified pressure with a nut (not shown) on the leaf spring 10 side. The stud bolts 8A and 8B are coated with insulation except for the threaded portions, and the leaf spring 10
The end of the side is secured to the mounting bracket 7B with a nut. Similarly, the flat thyristors 11 and 12 have cooling fins 1
3, 14, and 15, and the stud bolt 1
6, 17, a stud bar 18, and a plate spring 19 constitute a stack, which is attached to mounting fittings 20A and 20B.

These pairs of stacks are mounted to an insulating mounting plate 22 having cut-out holes through which conductors 21A, 21B, 21C, 21D are passed for making circuit connections. This mounting plate 22 is fixed to unit frame plates 24A and 24B having receiving metal fittings 23. The unit frame plates 24A and 24B constitute a unit frame with the stay 25. A mounting plate 26 is provided on the back of the mounting plate 22 and is fixed to the stay 25.
A CR circuit capacitor 27 and a resistor 28 are arranged on this mounting plate 26 for each of the thyristors 1, 2, 11, and 12. Also, although not shown, the mounting plate 26
Holes are bored through the conductors 21A, 21B, 21C, and 21D.

Such a conventional structure requires expensive insulating plates and stud bolts to attach the unit frame and the stack, and the stack requires a large number of parts to be assembled and requires a high number of man-hours. In addition, since the CR circuit components are placed at the back of the stack, the structure is complicated, such as the time required to connect these components to the conductors 21A to 21D, so miniaturization has the disadvantage of resulting in an expensive rectifier stack that requires a lot of assembly man-hours. Ta.

An object of the present invention is to provide an assembly structure that can simplify the structure and reduce the number of assembly steps. The present invention consists of alternately stacking power rectifying elements and cooling fins that also serve as terminal lead-out conductors, placing plate springs on both sides of this stacked body with insulating spacers in between, and stacking the rectifying elements and cooling fins. A bolt is passed through the cooling fin holding bracket and the leaf spring in the direction, and the bolt and the leaf spring are locked, and the spring pressure of the leaf spring pressurizes and holds the stack of rectifying elements and cooling fins to form a stack assembly. In a power rectifier stack that constitutes a three-dimensional structure and constitutes a power rectifier circuit by arranging the stack assemblies in parallel, each of the stack assemblies has an insulating tube covering the bolts and passing through the retaining bracket of the cooling fin. The screws at both ends of the bolts are screwed to a stack mounting plate that also serves as a side plate, and the CR of the rectifying element is attached to the mounting plate.
It is characterized by a structure equipped with circuit components.

FIG. 2 shows a single-phase bridge thyristor stack structure showing one embodiment of the present invention. The stacked body of thyristors 1, 2 and cooling fins 3, 4, 5 is connected to leaf springs 30A, 30A and 30A through insulating spacers 6 and 9 on both sides, respectively.
30B, and the pressing force is achieved by tightening the nut 32 with tie bolts 31A and 31B threaded on both sides. tie bolt 31
At A and 31B, the insertion portions of the cooling fins 3, 4, and 5 into the brackets are covered with insulating tubes 33A and 33B to provide insulation from the cooling fin side. Similarly, the thyristors 11 and 12 and the cooling fins 13 to 1
The stacked body of No. 5 is insulating spacers 34A, 34B,
Leaf springs 35A, 35B, tie bolts 36A, 36
B. It is assembled by tightening the nut 37 with a predetermined pressure. Further, insulating tubes 38A, 38B are provided on the tie bolts 36A, 36B.

These stack assemblies are constructed by attaching the tie bolts 31A, 31 to the mounting plates 39A, 39B, which serve as both side plates.
It is fixed by nuts 40A, 40B which pass through the ends of B, 36A, 36B and are screwed thereto. CR circuit resistors 41 are screwed to the stack assembly side of the mounting plates 39A and 39B, respectively, and capacitors 43 are screwed to the unit mounting seats 41A and 42B, respectively. In addition, the mounting plate 39
A, 39B are provided with holes 44 for passing the lead-out conductor from the capacitor 43 to the stack side.

Therefore, according to the present invention, the tie bolts of the stack also function as the conventional unit frame stays and become the fixing members to the mounting plate, and the ridge pipes 33, 38 provide insulation between the stack side and the mounting plate, making the conventional insulating plate 22 and the insulating coated stud bolts and stud bars unnecessary, and the mounting brackets 7,
Also, the CR circuit components can be mounted on a mounting plate 39 which is integral with the stack, eliminating the need for the conventional mounting plate 26. When forced air cooling of the thyristors is required, covers are provided on the front and back of the mounting plate, and a ventilation duct is formed by surrounding the covers and the mounting plate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional rectifier stack structure, and FIG. 2 is a perspective view showing an embodiment of the present invention. 1, 2, 11, 12...flat thyristor, 3,
4, 5, 13, 14, 15...cooling fin, 6,
9...Insulating spacer, 30A, 30B, 35A,
35B...Plate spring, 31A, 31B, 36A, 3
6B...Tie bolt, 38A, 38B...Insulating tube, 41...Resistor, 39A, 39B...Mounting plate, 43...Capacitor.

Claims (1)

[Scope of utility model registration request] Flat power rectifying elements and cooling fins that also serve as terminal lead-out conductors are stacked alternately, and leaf springs are placed on both sides of this stacked body with insulating spacers in between. A bolt is passed through the bracket for holding the cooling fin and the leaf spring, and the bolt and leaf spring are locked, and the spring pressure of the leaf spring is used to pressurize and hold the rectifying element and the stack of cooling fins to form a stack assembly. In a power rectifier stack in which a power rectifier circuit is constructed by arranging stack assemblies in parallel, each of the stack assemblies is constructed by covering the bolts with insulating tubes and passing them through the cooling fin holding brackets. A power rectifier characterized by a structure in which the cooling fin is insulated, the threaded portions at both ends of the bolt are screwed to a stack mounting plate that also serves as a side plate, and the CR circuit components of the rectifier are mounted on the mounting plate. Stack assembly structure.