JP6649240B2 - Thyristor stack unit - Google Patents

Description

  The present disclosure relates to a thyristor stack unit.

  Japanese Patent Laying-Open No. 2010-16959 (Patent Document 1) describes a power conversion device including a conventional thyristor stack unit.

JP 2010-16959 A

  Since the power converter mainly plays a part of the power system, it is desired that the downtime during maintenance is short.

  In the configuration described in Japanese Patent Application Laid-Open No. 2010-16959 (Patent Document 1), a thyristor stack and an electric device electrically connected to a thyristor element via a wiring are separately provided. When replacing the thyristor stack, it is necessary to remove and connect the wiring while the thyristor stack is installed in the panel, which requires a complicated and time-consuming operation.

  According to the present disclosure, a thyristor stack unit is provided, which makes it possible to increase the efficiency of thyristor stack replacement work and reduce the work time.

  According to the present disclosure, there is provided a thyristor stack unit including a thyristor stack, a gantry, a plurality of electric devices, and wiring. The thyristor stack is configured by stacking a plurality of thyristor elements. The gantry has a rectangular frame shape and mounts a thyristor stack. The electric device is housed in a gantry. The wiring electrically connects the thyristor element and the electric device. With the movement of the gantry, the thyristor stack and the electric device move integrally.

  In the thyristor stack unit described above, a part of the electric device projects from the gantry toward the thyristor stack.

  The thyristor stack unit further includes an insulator for insulating the thyristor element from the gantry. When viewed in the stacking direction of the thyristor elements, the insulator and the electric device overlap.

  In the thyristor stack unit described above, the gantry is movable in the stacking direction of the thyristor elements.

  According to the thyristor stack unit of the present disclosure, the work of replacing the thyristor stack can be made more efficient, and the work time can be reduced.

It is a front view of a power converter provided with a thyristor stack unit of an embodiment. It is a perspective view of a thyristor stack unit of an embodiment. It is a front view of the thyristor stack unit of an embodiment. It is a right view of the thyristor stack unit of an embodiment. It is a left view of the thyristor stack unit of an embodiment. It is a rear view of the thyristor stack unit of an embodiment. It is a top view of the thyristor stack unit of an embodiment. It is a bottom view of the thyristor stack unit of an embodiment.

  Hereinafter, a power converter according to an embodiment will be described with reference to the drawings. In the embodiments described below, the same or substantially the same configuration is denoted by the same reference numeral, and duplicate description will not be repeated.

  FIG. 1 is a front view of a power converter 100 including a thyristor stack unit 1 according to an embodiment. As shown in FIG. 1, the power conversion device 100 includes a frame 101 constituting a panel. The frame 101 includes a beam 102. The thyristor stack unit 1 of the embodiment is mounted on a beam 102 and installed in a panel.

  FIG. 2 is a perspective view of the thyristor stack unit 1 according to the embodiment. FIG. 3 is a front view of the thyristor stack unit 1 according to the embodiment. FIG. 4 is a right side view of the thyristor stack unit 1 according to the embodiment. FIG. 5 is a left side view of the thyristor stack unit 1 according to the embodiment. FIG. 6 is a rear view of the thyristor stack unit 1 according to the embodiment. FIG. 7 is a top view of the thyristor stack unit 1 according to the embodiment. FIG. 8 is a bottom view of the thyristor stack unit 1 according to the embodiment.

  As shown in FIGS. 2 to 8, the thyristor stack unit 1 includes a thyristor stack 2. The thyristor stack 2 has a plurality of thyristor elements 3 to 6. The thyristor elements 3 to 6 have a substantially disk shape. The thyristor stack 2 is a horizontal thyristor stack in which the stacking direction of the plurality of thyristor elements 3 to 6 is arranged in the horizontal direction. The thyristor elements 3 to 6 switch the current on and off in response to light or an electric signal supplied indirectly or directly from the outside.

  The thyristor stack 2 has a plurality of cooling fins 11 to 18. The cooling fins 11 to 18 have a substantially rectangular box shape. The cooling fins 11 to 18 are of an air-cooling type in which a plurality of fins are arranged inside a tubular section having a rectangular cross-section forming an outer shell and having no bottom, and heat is released from the fins by ventilation into the inside of the tubular section. It is a cooling member. The cooling fins 11 to 18 are not limited to the air-cooling type, and may be a water-cooling type.

  The thyristor elements 3 to 6 and the cooling fins 11 to 18 are alternately stacked. The cooling fins 11 and 12 are in contact with both surfaces of the thyristor element 3. The cooling fins 13 and 14 are in contact with both surfaces of the thyristor element 4. The cooling fins 15 and 16 are in contact with both surfaces of the thyristor element 5. The cooling fins 17 and 18 are in contact with both surfaces of the thyristor element 6. The cooling fins 11 to 18 radiate heat generated in the thyristor elements 3 to 6 to the outside.

  A cooling air partition plate 99 is provided above the plurality of cooling fins 11 to 18. The cooling air partition plate 99 is attached to holding plates 21 and 23 described later. As shown in FIG. 7, the cooling air partition plate 99 covers the entire thyristor stack 2 except for the cooling fins 11 to 18 and conductors 41 to 45 described later.

  In the cooling air partition plate 99, through holes are formed at positions corresponding to the cooling fins 11 to 18. Thus, the cooling air partition plate 99 does not obstruct the flow of the cooling air passing through the cooling fins 11 to 18. Further, the cooling wind partition plate 99 suppresses the air supplied to the thyristor stack 2 for cooling from flowing without passing through the cooling fins 11 to 18. Thereby, heat is more efficiently transmitted from the cooling fins 11 to 18 to the cooling air.

  When viewed in the stacking direction of the thyristor elements 3 to 6 and the cooling fins 11 to 18, the thyristor elements 3 to 6 are circular, and the cooling fins 11 to 18 are rectangular. The diameter of the circle formed by the thyristor elements 3 to 6 in the stacking direction is smaller than the short side of the rectangle formed by the cooling fins 11 to 18 in the stacking direction. The rectangle formed by the cooling fins 11 to 18 viewed in the stacking direction includes the circle formed by the thyristor elements 3 to 6 viewed in the stacking direction.

  A pair of holding plates 21 and 23 are arranged at both ends in the stacking direction of a stacked body in which the plurality of thyristor elements 3 to 6 and the plurality of cooling fins 11 to 18 are stacked. The holding plate 21 faces one end of the stack, and the holding plate 23 faces the other end of the stack. A pressing plate 22 is disposed between the holding plate 21 and the laminate. The holding plates 21 and 23 and the pressing plate 22 have a flat plate shape.

  Holes are formed in the corners of the pressing plates 21 and 23 and the pressing plate 22 so as to penetrate the pressing plates 21 and 23 and the pressing plate 22 in the stacking direction of the thyristor elements 3 to 6. Holes penetrating through the cooling fins 11 to 18 in the stacking direction of the thyristor elements 3 to 6 are formed at the corners of the cooling fins 11 to 18. Insulated rods 51, 54, 57, and 60 made of an insulating material in a rod shape are inserted into these holes. The insulating rods 51, 54, 57, and 60 extend in the stacking direction of the thyristor elements 3 to 6.

  One end of each of the insulating rods 51, 54, 57, and 60 passes through a hole formed in the holding plate 23 and is fixed to the holding plate 23. The other ends of the insulating rods 51, 54, 57, 60 pass through holes formed in the pressing plate 22, further penetrate the holding plate 21, and nuts 52, 53, 55, 56, attached to the holding plate 21. 58, 59, 61, and 62. Thus, the insulating rods 51, 54, 57, and 60 position the cooling fins 11 to 18.

  The pressure plate 22 is provided movably in the stacking direction of the thyristor elements 3 to 6 along the insulating rods 51, 54, 57, 60. A disc spring 34 is arranged between the pressing plate 21 and the pressing plate 22. The disc spring 34 has a ring-like shape. The pressing plate 22 is formed with a protrusion protruding from a surface facing the pressing plate 21. This projection is inserted into the hollow portion of the ring-shaped disc spring 34, and the disc spring 34 is attached to the pressure plate 22. The protrusion of the pressing plate 22 is formed in a hollow shape, and a female screw is formed on an inner peripheral surface thereof.

  The center bolt 32 is a pressure bolt having a head and a shaft having an external thread formed on the outer peripheral surface. The head of the center bolt 32 is located farther from the stacked body of the thyristor elements 3 to 6 than the holding plate 21. The shaft portion of the center bolt 32 penetrates the holding plate 21, is screwed into the female screw of the projection of the pressing plate 22, and is disposed so as to pass through the pressing plate 22. The tip surface of the shaft portion of the center bolt 32 is formed in a concave shape, typically a concave spherical shape.

  Between the pressurizing plate 22 and the cooling fins 11, a spherical seat 38 having a concave spherical surface facing the pressurizing plate 22 is provided. A spherical steel ball 36 is disposed at the center of the spherical seat 38 so as to be rotatable with respect to the spherical seat 38. The tip surface of the shaft of the center bolt 32 is in contact with the steel ball 36.

  A conductor 41 is arranged between the spherical seat 38 and the cooling fin 11. A conductor 42 is arranged between the cooling fins 12 and 13. A conductor 43 is arranged between the cooling fins 14 and 15. A conductor 44 is arranged between the cooling fins 16 and 17. A conductor 45 is arranged between the cooling fin 18 and the holding plate 23. The conductors 41 to 45 are formed of a conductive material.

  A bracket 64 formed by bending a flat plate material and forming an L-shape is attached to the outer side surface of the holding plate 21. At the lower side of the bracket 64, insulators 67 and 68 made of an insulating material are attached. A bracket 65 formed by bending a flat plate material and forming an L-shape is attached to the outer surface of the holding plate 23. Under the bracket 65, insulators 69, 70 formed of an insulating material are attached.

  In the thyristor stack 2 having the above-described configuration, the disc spring 34 is elastically deformed between the pressing plate 21 and the pressing plate 22, and the disc spring 34 is contracted in the stacking direction of the thyristor elements 3 to 6. The restoring force of the elastically deformed disc spring 34 for restoring the shape acts on the stacked body of the thyristor elements 3 to 6 and the cooling fins 11 to 18 via the pressure plate 22. The plurality of thyristor elements 3 to 6 and the plurality of cooling fins 11 to 18 are loaded by the restoring force of the disc springs 34 so that they are in close contact with each other.

  The thyristor stack unit 1 further includes a gantry 80. The thyristor stack 2 described above is mounted on a gantry 80. The gantry 80 has a rectangular parallelepiped frame shape. The gantry 80 has a rectangular upper frame 81, a rectangular lower frame 82, and a plurality of pillars 83 connecting the upper frame 81 and the lower frame 82. The pillar 83 is provided at least at a corner of the rectangular upper frame 81 and lower frame 82. The column 83 may be provided on the long sides of the rectangular upper frame 81 and lower frame 82. The column 83 may be provided at the center of the long sides of the rectangular upper frame 81 and lower frame 82.

  The longitudinal direction of the gantry 80 is a direction in which the long sides of the rectangular upper frame 81 and the lower frame 82 extend. The longitudinal direction of the gantry 80 matches the stacking direction of the thyristor elements 3 to 6 and the cooling fins 11 to 18 of the thyristor stack 2.

  The thyristor stack 2 is placed on the upper frame 81. The insulators 67 to 70 of the thyristor stack 2 are in contact with the upper frame 81 of the gantry 80. The insulators 67 to 70 fix the thyristor stack 2 to the gantry 80. The insulators 67 to 70 electrically insulate the thyristor elements 3 to 6 from the gantry 80. The insulators 67 to 70 are fixed to the upper surfaces of the corners of the rectangular upper frame 81, so that the thyristor stack 2 and the gantry 80 are formed as an integrated structure.

  Terminal supports 85 are provided on a pair of short sides of the rectangular lower frame 82. A terminal block 84 is attached to the terminal support 85.

  Rollers 86 to 89 are attached to the lower frame 82 so as to be rotatable with respect to the lower frame 82. The rollers 86 to 89 are provided on the outer surface of the long side of the rectangular lower frame 82. The rollers 86 and 87 are arranged at one end of the gantry 80 in the longitudinal direction. The rollers 88 and 89 are arranged at the other end in the longitudinal direction of the gantry 80. The rollers 86 to 89 are provided for facilitating relative movement of the gantry 80 with respect to the mounting surface of the gantry 80, or the beam 102 (FIG. 1) in the present embodiment. With the rollers 86 to 89, the gantry 80 is configured to be easily movable in the longitudinal direction of the gantry 80, that is, in the stacking direction of the thyristor elements 3 to 6.

  A bracket 90 is fixed to the outer surface of the long side of the rectangular lower frame 82. The bracket 90 is disposed between the rollers 86 and 87 and between the rollers 88 and 89. The bracket 90 is provided to fix the thyristor stack unit 1 in the panel. The thyristor stack unit 1 is fixed to the beam 102 by fixing the bolt to the beam 102 through a through hole formed in the bracket 90.

  The thyristor stack unit 1 further includes a plurality of electric devices 93 to 96. The electric devices 93 to 96 may be, for example, gate pulse transformers. At least a part of the electric devices 93 to 96 is housed in a space surrounded by the upper frame 81, the lower frame 82, and the pillar 83. Some of the electric devices 93 to 96 project from the gantry 80 toward the thyristor stack 2.

  The lower frame 82 of the gantry 80 has a plurality of beams 82B (FIG. 8) extending in the short side direction. The electric devices 93 to 96 are mounted on the beam 82 </ b> B and supported by the lower frame 82. As shown in FIGS. 3 and 6, the insulators 67 to 70 and the electric devices 93 to 96 overlap when viewed in the stacking direction of the thyristor elements 3 to 6.

  The thyristor stack unit 1 further includes wirings 73 to 76 for electrically connecting the thyristor elements 3 to 6 to the electric devices 93 to 96.

  The wiring 73 connects the thyristor element 3 and the electric device 93. The wiring 73 extends from the thyristor element 3 toward the gantry 80, and the tip of the wiring 73 is connected to the electric device 93.

  The wiring 74 connects the thyristor element 4 and the electric device 94. The wiring 74 extends from the thyristor element 4 toward the gantry 80, and the tip of the wiring 74 is connected to the electric device 94.

  The wiring 75 connects the thyristor element 5 and the electric device 95. The wiring 75 extends from the thyristor element 5 toward the gantry 80, and the tip of the wiring 75 is connected to the electric device 95.

  The wiring 76 connects the thyristor element 6 and the electric device 96. A wiring 76 extends from the thyristor element 6 toward the gantry 80, and a distal end of the wiring 76 is connected to the electric device 96.

  On the upper surface of the upper frame 81 of the gantry 80, a plurality of, more specifically, the same number of insulating supports 98 as the electric devices 93 to 96 are fixed. The wirings 73 to 76 extending from the thyristor elements 3 to 6 to the mount 80 may be directly connected to the electric devices 93 to 96. For example, when the entire electric device is housed inside the mount 80, The wiring can be supported by the insulating support 98.

  The thyristor stack unit 1 described above includes a gantry 80, a thyristor stack 2 mounted on the gantry 80, and electric devices 93 to 96 at least partially housed in the gantry 80. Since the thyristor stack 2 and the electric devices 93 to 96 are integrated, the thyristor stack 2 and the electric devices 93 to 96 can be integrally moved by moving the gantry 80.

  When any one of the thyristor elements 3 to 6 is replaced, the operator pulls out the thyristor stack unit 1 having the thyristor elements 3 to 6 to be replaced from the frame 101 (FIG. 1) of the power conversion device 100, and replaces the new thyristor stack. The unit 1 is moved into the frame 101 and installed.

  When pulling out the thyristor stack unit 1 to be replaced, there is no need to remove the wires 73 to 76 connecting the thyristor stack 2 and the electric devices 93 to 96. In the new thyristor stack unit 1, since the thyristor stack 2 and the electric devices 93 to 96 are connected in advance by the wires 73 to 76, the wires 73 to 76 are connected after the thyristor stack unit 1 is moved into the frame 101. No need. The removal and connection of the wirings 73 to 76 can be performed outside the frame 101, and the complicated work of removing and connecting the wirings 73 to 76 in the frame 101 is not required. Therefore, the replacement operation of the thyristor stack 2 can be simplified, so that the operation efficiency can be improved and the operation time can be shortened.

  Further, as shown in FIGS. 2 to 6, some of the electric devices 93 to 96 project from the gantry 80 toward the thyristor stack 2. In order to achieve electrical insulation between the thyristor elements 3 to 6 and the gantry 80, it is necessary to secure a spatial distance between the thyristor elements 3 to 6 and the gantry 80, and the thyristor elements 3 to 6 are separated from the gantry 80. It is arranged. A hollow space is formed between the thyristor elements 3 to 6 and the gantry 80. By arranging a part of the electric devices 93 to 96 in this hollow space, the space required for installing the electric devices 93 to 96 can be reduced, so that the outer dimensions of the thyristor stack unit 1 can be reduced, and the size can be reduced. A thyristor stack unit 1 that is easy to handle can be realized. In addition, the lengths of the wirings 73 to 76 connecting the thyristor elements 3 to 6 and the electric devices 93 to 96 can be reduced.

  Also, as shown in FIGS. 3 and 6, the thyristor elements 3 to 6 are electrically insulated from the gantry 80 when viewed in the stacking direction of the thyristors 3 to 6 (perpendicular to the paper surface in FIGS. 3 and 6). Insulators 67 to 70 and electric devices 93 to 96 overlap. Thereby, the configuration in which a part of the electric devices 93 to 96 is arranged in the hollow space between the thyristor elements 3 to 6 and the gantry 80 can be reliably realized.

  The gantry 80 is configured to be movable in the stacking direction of the thyristor elements 3 to 6 (the direction perpendicular to the plane of FIG. 1). In this way, the space in the frame 101 that needs to be secured for the movement of the thyristor stack unit 1 can be reduced, and the power converter 100 can be downsized.

  After the thyristor stack unit 1 including the thyristor elements 3 to 6 to be replaced is pulled out of the frame 101, the thyristor element to be replaced is removed from the thyristor stack 2 and a spare thyristor element is newly attached to the thyristor stack 2. At this time, the plurality of thyristor elements 3 to 6 and the plurality of cooling fins 11 to 6 are rotated by rotating the center bolt 32 to shorten the length of the shaft of the center bolt 32 protruding from the pressure plate 22 toward the cooling fin 11. 18 and the force applied to the laminate. When the tip surface of the shaft portion of the center bolt 32 of the center block moves away from the steel ball 36, the plurality of thyristor elements 3 to 6 and the plurality of cooling fins 11 to 18 are released from the restoring force of the disc spring 34. In this state, the thyristor elements can be easily replaced individually.

  The thyristor stack unit 1 whose thyristor element has been replaced is stored as a new spare thyristor stack unit, and is used at the time of replacement of the thyristor stack unit in the next and subsequent times.

  Although the embodiments have been described as above, the embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  REFERENCE SIGNS LIST 1 thyristor stack unit, 2 thyristor stack, 3 to 6 thyristor element, 11 to 18 cooling fin, 21 and 23 holding plate, 22 pressing plate, 32 center bolt, 34 disc spring, 36 steel ball, 38 spherical seat, 41 to 45 Conductor, 51, 54, 57, 60 Insulating rod, 52, 53, 55, 56, 58, 59, 61, 62 Nut, 64, 65, 90 Bracket, 67-70 insulator, 73-76 Wiring, 80 mounting, 81 Upper frame, 82 Lower frame, 82B Beam, 83 Column, 84 Terminal block, 85 Terminal support, 86-89 Roller, 93-96 Electrical equipment, 98 Insulation support, 99 Cooling wind divider, 100 Power converter, 101 Frame, 102 beams.

Claims (5)

A thyristor stack in which a plurality of thyristor elements are stacked,
The thyristor stack is mounted, a rectangular upper frame, a rectangular lower frame, a rectangular frame-shaped mount having a plurality of pillars connecting the upper frame and the lower frame ,
A plurality of electrical devices housed in the gantry, supported by the lower frame, and disposed immediately below the thyristor element ,
A wiring for electrically connecting the thyristor element and the electric device,
A thyristor stack unit in which the thyristor stack and the electric device move integrally as the gantry moves.   The thyristor stack unit according to claim 1, wherein a part of the electric device projects from the gantry toward the thyristor stack. Further comprising an insulator for insulating the thyristor element from the gantry,
3. The thyristor stack unit according to claim 2, wherein the insulator and the electric device overlap with each other when viewed in a stacking direction of the thyristor elements. 4.   The thyristor stack unit according to any one of claims 1 to 3, wherein the mount is movable in a stacking direction of the thyristor elements. 2. The thyristor stack unit according to claim 1, wherein the gantry has the same number of insulating supports as the number of the electric devices fixed to the upper surface of the upper frame. 3.