JP2604749Y2 - Inverter panel for line - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter for a line in which a plurality of inverters used in a paper mill, a steel rolling mill, etc. are mounted in a single box. The present invention relates to an inverter for a line, which enables standardization of a box structure for mounting a motor.

[0002]

2. Description of the Related Art In a roll paper production line in a paper mill, a rolling line in an iron plate rolling mill, etc., a large number of AC motors are arranged along the lines, and these AC motors are driven. Many inverters are intensively mounted on one or two or more inverter boards. The DC power supplied to a plurality of inverters used for such a purpose carries a large current, and such a plurality of inverters are connected to the power supply connector of each inverter. A DC power supply bus to be supplied to each inverter must be provided in an appropriate structure in a box body of the mounted inverter panel.

FIG. 3 shows a structural example of a DC power supply circuit in a box (hereinafter referred to as a rack) of a line inverter board on which a plurality of inverters are intensively mounted. FIG. 3 is a schematic structural view showing a state where two racks A and B are arranged back to back, and FIG. 3 (B) shows a side surface excluding a side plate of the rack. Figure 3 looking down
It is shown in FIG. FIGS. 3A and 3B show the schematic structure of the power supply bus in the rack, respectively.
The rack structure and the structure of the inverter mounted on the rack are simplified to show only the concept. Also, the illustration of the fixed insulating member of the DC power supply bus, the lead-in wire of the DC power supply bus to the rack, and the like is omitted. 3A and 3B,
30A and 30B are racks arranged back to back, and a plurality of inverters,
40A1, 40A2,..., 40Ai, 40An are mounted, and a plurality of inverters 40B are mounted on the second rack 30B.
, 40B2,..., 40Bi, 40Bn. Each inverter 40A1, 40A2, ..., 40A
i, 40An, 40B1, 40B2,..., 40Bi, 4
0Bn are front maintenance types, respectively.
Rails 31A and 32A fixed to A and 30B, respectively.
31B and 32B, and the rack 3
0A and 30B.

Next, a power supply circuit will be described. In the following description, the inverters do not always have the same function and performance, but since the connection structure with the power supply bus according to the present invention is common to all the inverters, the uppermost inverter 40A
1, 40B1 will be described as a representative. 33AP and 33AN provided on the first rack 30A and 33BP and 33BN provided on the second rack 30B shown in FIG. 3 are vertical buses for DC power, respectively, and are fixed vertically at predetermined positions on the back of each rack. The DC power supply vertical bus 33AP and the DC power supply vertical bus 33BP are a positive power supply vertical bus, and the DC power supply vertical bus 33AN and the DC power supply vertical bus 33BN are a negative power supply vertical bus. The vertical bus bar 33AP for the positive power source of the first rack 30A is connected to a horizontal bus bar 34AP for the positive power source fixed in a horizontal position at an appropriate position on the ceiling of the rack 30A, and the vertical bus bar 33AN for the negative power source of the rack 30A. Is connected to a minus power horizontal bus 34AN fixed in a horizontal position at an appropriate position on the ceiling of the rack 30A. The power horizontal buses 34AP and 34AN fixed in a horizontal position are connected to a power bus outside the rack and are provided with switches, but illustration of switches and connection wires to the external power bus is omitted. I have. The positive power supply vertical bus 33BP of the second rack 30B is connected to the positive power supply horizontal bus 34BP fixed in a horizontal position at an appropriate position on the ceiling of the rack 30B, and the negative power supply vertical bus 33BP of the rack 30B. Bus 33
BN is connected to a minus power horizontal bus 34BN fixed in a horizontal position at an appropriate position on the ceiling of the rack 30B. The horizontal bus bar for power supply 34BP fixed in a horizontal posture,
34BN is connected to a power bus outside the rack and is provided with switches, but illustration of switches and connection wires to the external power bus is omitted.

[0005] On the back of the box of the first inverter 40A1 mounted on the first rack 30A, each positive circuit connector 41A1P connected to a positive power supply circuit (not shown) inside the inverter is positive. A minus circuit arranged at a position to be fitted to the power supply vertical bus 33AP, connected to the plus power supply vertical bus 33AP, and also connected to the minus side (not shown) of the power supply circuit inside the first inverter. Connector 41A1N is disposed at a position where it is fitted to the negative power supply vertical bus 33AN, and the negative power supply vertical bus 33A
Connected to N. Other inverters mounted on the first rack 30A are connected to the respective power supply buses in the same structure as described above. Similarly, the second mounted on the rack 30B
At the back of the box of the inverter 40B1, each plus circuit connector 41B1P connected to a plus power circuit (not shown) inside the inverter is disposed at a position to be fitted to the plus power vertical bus 33BP. Vertical bus 33B for power supply
The negative circuit connector 41B1N, which is connected to the power supply circuit P and is also connected to the negative side (not shown) of the power supply circuit inside the inverter, is disposed at a position where it is fitted to the negative power supply vertical bus 33BN. Vertical bus 33BN
It is connected to the. The other inverters mounted on the second rack 30B are connected to the respective power supply buses in the same structure as described above.

[0006]

[Problems to be Solved by the Invention] By the way, each power supply connector of the line inverter as described above is
As a unified standard, it is stipulated that, when viewed from the surface of the box, the left side is provided with a negative power supply connector and the right side is provided with a positive power supply connector. Front maintenance type inverters do not require rear maintenance, so if a large number of inverters need to be housed in two or more racks, conditions such as wiring and maintenance areas in the factory are required. Therefore, in many cases, two racks are arranged back to back as shown in FIG. That is, if an inverter is inserted and mounted from both sides of one rack and a power bus is provided vertically in the middle of the rack, the power bus is provided on the back of the inverter to be mounted. It is necessary to provide two types of connectors, but such an inverter is not recognized, so that two racks must be provided as described above. Therefore, 2
In order to arrange the two racks facing each other, a space for connecting a power supply bus to each rack and a space for arranging two rows of power supply buses were required. The present invention solves the above-mentioned problems (problems) of the conventional device, standardizes racks, and integrates back-to-back racks to reduce the bottom area of the racks. It is an object to provide an inverter board for use.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a line inverter board according to the present invention is provided with:
In a line inverter board on which a plurality of inverters are mounted, three buses of a DC power supply to which the power supply connector of the inverter is connected are vertically arranged in the center of the box body of the inverter board. The three buses are configured such that the bus located at the center and the bus located on both sides are used for power supplies having different polarities.

[0008]

According to the present invention, as described above, this inverter is used in a line inverter panel having a plurality of inverters.
Since three power supply buses to which the power supply connector of the inverter is connected are arranged side by side in the center of the rack (box of the inverter board), the inverters can be inserted and placed from both sides with this power supply bus interposed. The power supply connector is reversed in the direction of placement of the power supply, but the polarity of the power supply is correctly connected to each connector. Further, since only one row of power supply buses is required for two rows of inverters, the bottom area of the rack can be made smaller than that of the conventional one. When these three power supply buses are used on both sides for a negative power supply and the center for a positive power supply, they can be used in conformity with the rule that the left side when viewed from the front of the inverter is a negative connector.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a line inverter board according to the present invention will be described in detail with reference to FIGS. FIG. 1 shows an example of the structure of a DC power supply circuit in a line inverter board (hereinafter abbreviated as a rack) on which a plurality of inverters are intensively mounted. In FIG. 1, FIG. 1A is a view in which a ceiling plate is removed from an upper portion of a rack, and FIG. 1B is a front view. Each shows the configuration of the DC power supply circuit.
The structure of the rack is omitted and only the concept is illustrated. In addition, detailed illustration of the service lines and the like of the DC power supply circuit is also omitted. 1A and 1B, reference numeral 10 denotes a rack, and an upper insulating member 1U fixed to the upper portion of the rack 10 with a member not shown, a lower insulating member 1D fixed to a lower portion of the rack 10 with a member not shown, and The first vertical bus bar 2N1 for negative power supply, the vertical bus bar 2P for positive power supply, and the second vertical bus bar 2N for negative power source are provided by an intermediate insulating member 1M fixed to a predetermined position in the middle of the rack 10 by a member (not shown).
Two three power buses are fixed vertically in parallel.
The two negative power supply vertical buses 2N1 and 2N2 are connected to a negative power supply horizontal bus 4N fixed to the upper insulating member 1U in a horizontal posture by a plurality of insulating members 3, and the positive power supply vertical bus 2P is composed of a plurality of Insulation member 3 and upper insulation member 1U
Is connected to a horizontal power supply bus 4P for positive power supply fixed in a horizontal posture. The negative power horizontal bus 4N and the positive power horizontal bus 4P are connected to an external power bus (not shown) via a power breaker connected to a not-shown lead-in line. These power buses are supplied from a rectifier circuit (not shown) which is arranged at a predetermined position and has an appropriate capacity after converting the distributed AC power into DC.

In the configuration of this embodiment described above, the bus of the DC power supply in the rack is composed of three vertically arranged power buses, a first vertical bus for negative power supply, a second vertical bus for negative power supply, Although the description has been made in such a manner that the vertical power bus for the positive power supply, the horizontal bus for the positive power supply provided horizontally, the horizontal bus for the negative power supply, and the like are used, except for the three power supply buses arranged vertically, this rack is used as an equipment. It may be set appropriately in accordance with the laying state of the external DC power supply bus and the structure of the rack, etc., corresponding to the environment to be performed. The three power buses arranged vertically may all have a uniform shape. However, the receptacle of this connector is provided at the fitting portion of the connector provided on each inverter, and the other receptacles of this connector are provided. A suitable bus shape may be used to connect the mouths to one another. In that case, an intermediate insulating member may be provided at the socket of the connector.

FIGS. 2A and 2B show a situation where the inverter is inserted and mounted in the rack 10 shown in FIG. FIG. 2A shows the rack 10 shown in FIG.
10 is a view of the side structure view of FIG.
2 (A) and 2 (B) show the outline of the rack structure, and show the rack and the inverter respectively.
The structure of the power supply is simplified and only the concept is shown, and the details of the insulating member for fixing each DC power supply bus and the drawing in of the DC power supply bus are omitted. 2 (A) and 2 (B), two inverters are mounted on each side of rails 6 and 7 which are horizontally fixed at appropriate intervals to mount inverters vertically on both sides of the rack 10. Inverters 20A1, 20B
1, 20A2, 20B2, ..., 20Ai, 20B
A predetermined number of i, 20An, and 20Bn are mounted as a whole, and are fixed by predetermined fixing means (not shown). Although the above-mentioned inverters mounted on the rack are all of the front maintenance type, they do not always have the same function and performance. However, since the connection structure with the vertical power supply bus according to the present invention is common to all the inverters, the first inverter 20A1 and the second inverter 20B1 which are the uppermost inverters are represented. explain.

2A and 2B, reference numeral 1M denotes an intermediate insulating member fixed horizontally to the rack 10 at an appropriate interval. An intermediate insulating member 1M and an upper insulating member (1U shown in FIG. 1, not shown in FIG. 2) and a lower insulating member (1D shown in FIG. 1, not shown in FIG. 2) have a first negative power supply. Three power buses, a vertical bus 2N1, a positive power vertical bus 2P, and a second negative power vertical bus 2N2, are fixed vertically in parallel. On the back surface 20A1a of the first inverter 20A1 mounted back to back, a positive power connection connector 21AP and a negative power connection connector 21 are provided.
The positive power supply connector 21AP is fitted to the positive power supply vertical bus 2P, and the negative power supply connector 21AN is connected to the first negative power supply vertical bus 2N1.
Is fitted. The positive power supply connector 21AP of the first inverter 20A1 is connected to a positive power supply circuit inside the first inverter 20A1 via a power switch (not shown) via an overcurrent breaker or the like, and is used for connecting a negative power supply. The connector 21AN is connected to the minus side of each power supply circuit inside the first inverter 20A1. Similarly to the first inverter 20A1, a positive power supply connector 21BP and a negative power supply connector 21BN are provided on the rear surface 20B1a of the second inverter 20B1, and the positive power supply connector 21BP is positive. Fitted to the power supply vertical bus 2P, the negative power supply connector 21BN
Are fitted to the second negative power supply vertical bus 2N2. A positive power supply connector 21BP of the second inverter 20B1 is connected to a positive power supply circuit inside the second inverter 20B1 via a power switch (not shown) via an overcurrent breaker or the like, and is used to connect a negative power supply. Connector 21
BN is connected to the minus side of each power supply circuit inside the second inverter 20B1.

That is, with the above configuration, the plus power used for the first inverter 20A1 is supplied from the plus power vertical bus 2P, and the minus power circuit is connected to the first minus power vertical bus 2N1. You. On the other hand, the second
The plus power supply used for the inverter 20B1 is supplied from the plus power supply vertical bus 2P, and the minus power supply is used as the second power supply.
Is connected to the negative power supply vertical bus 2N2. The above-described first inverter 20A1 and second inverter 20B1
The other inverters have the same structure.
Power is supplied to each of the inverters other than the inverter 20A1 and the second inverter 20B1 in the same configuration as that shown in FIG. The above description shows an example of the configuration of the present invention and its functions, and may be arbitrarily and appropriately configured according to the technical idea of the present invention. It can be put to practical use even if the center is minus and both sides are plus with respect to the power supply vertical bus.

[0014]

[Effects of the Invention] The present invention has the following excellent effects because it is configured as described above. The inverters can be inserted from both sides of the three DC power supply buses, that is, the positive and negative DC power supply vertical buses. In that case, the power supply connector is reversed in the direction of the inverter placement, but the polarity of the power supply is correctly connected to each connector.
Since only one row of DC power supply lines is required for two rows of inverters, the bottom area of the rack can be made smaller than before.
When three buses of DC power supply are arranged side by side for negative power supply and the center for positive power supply, it can be used in compliance with the rule that the left side when viewed from the front of the inverter is a negative connector. .

[Brief description of the drawings]

FIG. 1 is a schematic wiring diagram of a power supply bus of an inverter board showing an example of wiring of a power supply bus in a line inverter board based on the present invention, wherein FIG. 1 (A) is a horizontal sectional view and FIG. ) Is a rear view.

FIGS. 2A and 2B are schematic structural views of the inverter panel showing an inverter mounted on the inverter panel shown in FIG. 1, wherein FIG. 2A is a horizontal sectional view, and FIG. It is a side view.

FIG. 3 shows an inverter on a conventional two-inverter panel.
2A and 2B are schematic structural views of an inverter board showing a situation where the inverter is mounted, wherein FIG. 1A is a horizontal sectional view and FIG. 1B is a side view.

[Explanation of symbols]

1D: Lower insulating member 1M: Intermediate insulating member 1U: Upper insulating member 2N1, 2N2: Vertical bus for negative power supply (DC negative power bus) 2P: Vertical bus for positive power supply (DC positive power bus) 3: Insulating member 4N : Horizontal bus bar for negative power supply 4P: Horizontal bus bar for positive power supply 10: Rack (inverter panel box) 20A1, 20B1, 20A2, 20B2,.
0Ai, 20Bi, 20An, 20Bn: Inverter 21AN, 21BN: Connector for negative power supply connection 21AP, 21BP: Connector for positive power supply connection

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02B 1/20 H02B 1/30-1/32 H02M 7/04 H02M 7/48

Claims (1)

(57) [Scope of request for utility model registration] 1. In a line inverter board on which a plurality of inverters are mounted, a bus of a DC power supply to which a connector for power supply of the inverter is coupled is vertically arranged at a center of a box body of the inverter board. 3. An inverter board for a line, wherein three buses are arranged side by side, and the buses located at the center and the buses located on both sides are used for power supplies of different polarities.