JP2002369547A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power converter with a board structure of compactly storing a plurality of water-cooling units, separating a water system from outside connecting parts, and defining an accessory arranging area. SOLUTION: In this power converter has a housing, which stores a plurality of converting circuits for converting alternating current to direction current or direct current to alternating current by the unit, the housing is divided into three portions from the front side to the back side so that a first space on the front side may house a plurality of units, a second space may house main circuit accessories such as a DC bus, and a DC capacitor, and a third space may house input/output part of an external cable. Thus, installation location of the accessories can be defined in the housing according to their roles, for example, the outside connecting parts are disposed in the back side space, respective units in which exchangeability is taken in preference are disposed in the front side space; and the main circuit accessories are disposed in the center space, thereby separating the accessories according to applications, and wiring and disposing the accessories by a shortest distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power converter having an inverter for converting a DC voltage to an AC voltage,
In particular, the present invention relates to a power conversion device in which a board structure accommodating a plurality of water-cooled units is made compact, a water system is separated, and external connection parts are clarified.

[0002]

2. Description of the Related Art A conventional load commutation type water-cooled inverter will be described with reference to FIG. FIG. 4 is a block diagram showing a main circuit of a conventional load commutation type inverter generally used and a board divided configuration. As shown in the figure, the power conversion device converts the voltage of an AC power supply 11 into a DC voltage by a plurality of thyristors 1, and further converts the voltage into a desired AC voltage by an inverter circuit including a plurality of thyristors 3 via a capacitor 2. , Load 1
2 is provided.

A housing 13 for housing the above-described power conversion circuit
Has a housing 13A of an input portion to the thyristor 1;
The thyristor 1 includes a housing 13B of the unit 10 part, a housing 13C of the capacitor 2 part, a housing 13D of the unit 30 part of the thyristor 3, and a housing 13E of an output part from the thyristor 3. ing.

As shown in FIG. 5, when the housing 13B accommodates the thyristor 1 which is cooled by water cooling, the main water main pipes 6, 7 for supplying and discharging water to and from each unit 10 are connected to the back of the panel. It is arranged on the left and right sides, and each unit 1
0 is connected to the branch pipe 8.

[0005] The branch pipe 8 is also connected to the unit 10 from the rear side.
Between the two sides, the main circuit bus 5 inside the housing and the main circuit parts where water cooling is unnecessary are mixed, and if there is a problem such as water leakage from piping etc., there is a possibility that water will splash on the main circuit. The range is expected to be large, and the shape of the branch pipe 8 is almost straight. Although it is bent in a Z-shape in the middle, the flexibility at the time of attachment and detachment to and from the unit is not as effective as the U-order bending.

When the water pipes 6 and 7 are on the back and the water-cooled unit 10 is on the front, the air release cock 9 above the water pipes 6 and 7 is on the back during the air release operation. become.

[0007]

As described above, in the conventional power conversion device configuration, since a housing is provided for each electric circuit, the device cannot be made compact and inexpensive. Since it is mixed with other electric circuit products, when water leakage or the like occurs, there is a possibility that electric products unrelated to water cooling may be affected. In addition, if a housing is provided for each electric circuit as described above, it is unclear how far the housing is standard or how far the standard part is as a device, and it is changed every time the device capacity increases. There is a possibility that the number of elements may increase, and it is difficult to standardize the housing.

Therefore, as described above, the capacitor 2
Is divided into two, and one is a capacitor 2A and the other is a capacitor 2B, the input part to the thyristor 1, a plurality of units of the thyristor 1 and the capacitor 2A are housed in one housing, and the remaining capacitor 2B and the thyristor It is necessary to make a panel structure for accommodating a plurality of units and an output part from the thyristor 3 in one case. Further, as an internal structure of one case, a water-cooled unit and a piping system part, a DC capacitor and a DC It is necessary to completely divide the inside of the housing into three parts, such as the busbar part, the input and output part, etc., and the external connection part, and realize a device that realizes separation of the water system and the external connection part and clarification of the equipment arrangement area. there were. To achieve this, further high-density mounting is indispensable.However, clarifying the division of the product storage area and the distinction of each electric circuit, and lowering the reliability and maintainability due to blindly increasing the density Must be avoided by the following measures. That is, (1) Secure the minimum necessary space assuming the circuit flow (the connection conductors do not move back and forth). (2) Prioritize maintainability such as maintenance, and secure and arrange the minimum necessary maintenance space. (3) In a water-cooled device, the water system and the charged parts such as the main circuit are separated as much as possible.

Further, with this configuration, when the capacity of the device is increased, one housing which is terminated as a circuit can be easily arranged on multiple surfaces to cope with the large capacity, and the standardization of the device can be achieved. By contributing and separating the water system from the main circuit where water cooling is unnecessary, it is possible to minimize the possibility and range of water splashing on the main circuit in the event of a problem such as water leakage from piping etc. Since the air bleeding cock is installed on the front side of the panel for the air bleeding operation in the pipe, there is an advantage that the presence or absence of bubbles in the water cooling unit can be simultaneously performed during the air bleeding operation.

SUMMARY OF THE INVENTION The present invention has been made in order to cope with the above situation, and its object is to provide a compact panel structure accommodating a plurality of water-cooled units, to separate a water system from an external connection portion, and to arrange an article. An object of the present invention is to clarify an area and provide a power converter excellent in reliability around water.

[0011]

According to one aspect of the present invention, there is provided a housing for accommodating a plurality of conversion circuits for converting an alternating current into a direct current or a direct current into an alternating current in units of units. In the power conversion device provided with the above, the inside of the housing is divided into three from the front to the back, each of the plurality of units is housed in the first space on the front, and the DC bus or the DC capacitor or the like is stored in the second space. The main main circuit article is stored, and the input / output section of the external cable is stored in the last third space.

According to the first aspect of the present invention, the external connection portion is located on the rear surface, each unit whose exchangeability is prioritized is located on the front surface, and other main circuit articles are assigned to the central portion of the housing and the location of the storage articles in the housing for each role. It is possible to separate and wire and arrange articles in the shortest time for each application.

According to a second aspect of the present invention, in the power conversion device according to the first aspect, when each of the plurality of units is water-cooled, the water-cooling article is stored in the first space on the front side in the housing, and The arrangement is separated from the main circuit components other than the water-cooled parts, and the other storage space is free of water-mixing such as water-cooled piping.

According to the second aspect of the present invention, when a plurality of units are water-cooled, of the three divided storage spaces in the housing, the configuration around the water is concentrated in the first storage space on the front side, so that two units can be cooled. Thirdly, it is possible to prevent water from being mixed in the other main circuit spaces, thereby improving the reliability with respect to water.

According to a third aspect of the present invention, in the power converter according to the first or second aspect, the first space for accommodating the water cooling unit is a main water main pipe for supplying and draining water to each unit. Are vertically arranged from the floor surface to the ceiling direction at the forefront left and right sides of the housing, and the branch pipe shape supplied from the water main pipe to each water cooling unit has a U-shape. The U-shaped branch pipe is brought to the water main pipe on the front surface of the housing.

According to the third aspect of the invention, the air in the piping of the water cooling device is evacuated by bleeding air from the air bleeding cock above the main water pipe, and the degree of bleeding and the fluororesin in the unit such as polytetrafluoroethylene. (PTF
E) Degassing is performed while checking for air bubbles in the pipes made of the product. Main water pipes for water supply and drainage to each unit are placed on the front left and right sides of the housing in the direction from floor to ceiling. By arranging vertically, the air can be checked at once from the front side. The branch pipe shape supplied from the water main pipe to each water cooling unit is U-shaped, and the U-shaped branch pipe is brought to the water main pipe on the front of the housing from the water supply and drain ports located at the left and right rear parts of each unit. From the main water main pipe to the water cooling unit, the pipe shape has a length, and the resistance of the pure water inside the pipe can be made high by the length. It is possible to absorb the stress at the time of attaching and detaching the water cooling unit and the branch pipe, and to obtain a configuration that can be easily attached and detached. The water used for cooling has both functions of cooling and insulation.In particular, for insulation, pure water is used for water because it passes directly through the charging section, which is the main circuit section, for cooling. By increasing, insulation by water can be realized.

According to a fourth aspect of the present invention, in the power converter according to any one of the first to third aspects, the first space for housing the water cooling unit is used for supplying and draining water to each unit. The main water main pipes are respectively arranged vertically from the floor surface to the ceiling direction on the front left and right sides of the housing, and the branch pipe shape to be supplied from the water main pipe to each water cooling unit is U-shaped. It is characterized in that the U-shaped branch pipe is brought into a water main pipe on the front surface of the housing from a water supply / drain port located there.

According to the fourth aspect of the present invention, a DC capacitor required for a water cooling unit corresponding to each phase is separated into a P-pole and an N-pole in a second space on the back side of each phase water-cooling unit so as to be in the immediate vicinity of the unit. The wiring length from the unit to the DC capacitor can be minimized, and the DC bus is arranged vertically between the left and right P-pole and N-pole capacitors. Main circuit supplies can be arranged.

According to a fifth aspect of the present invention, in the power converter according to any one of the first to fourth aspects, the third external cable input / output portion space in the housing divides the inside of the panel into three from the front. As a result, the exclusive space for the input and output of the external cable is completely secured on the rear side of the panel.

According to the fifth aspect of the present invention, a space exclusively used for input / output of an external cable can be completely secured on the rear side of the panel, the cable can easily be pulled in up and down, and the internal water system section and the external line connection section can be connected. Can be separated.

According to a sixth aspect of the present invention, in the power converter according to any one of the first to fifth aspects, water is supplied to and drained from each unit disposed on the left and right sides of the first storage space in the housing. The main water main pipe for L
The bottom of this L-shape is 3
The storage space is characterized by having a water main pipe extending toward the front of the board so as to follow the floor of the storage space and vertically rising at the front of the board in the first space of the unit storage.

According to the invention described in claim 6, the second storage space is completely separated from the electric appliances other than water-cooled electric appliances stored in the second storage space by passing through the floor surface. Since the external connection position of the left and right water pipes in the housing is also in the third storage space, the external connection is the same as the external cable.
Connections can be separated and clarified.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of the inside of a housing of a power converter according to an embodiment of the present invention (corresponding to claims 1 to 6).

As shown in the figure, in this embodiment, a plurality of DC capacitors 20 connected in parallel are connected to two DC capacitors 20A and 20B.
The first half of the circuit is divided into the casing 14A, and the second half of the circuit is divided into the casing 14B.
And As shown in FIG. 2, the storage system for the articles in the housing is divided into three parts from the front side of the housing, the first storage space which is the storage part of the three-stage water cooling unit 21, and the main circuit part other than the water cooling (DC capacitor). 20, main circuit bus 22)
The second storage space is divided into a third storage space for input / output connection with the outside.

Since the present embodiment is configured as described above, it is possible to provide an in-chassis configuration that can eliminate a decrease in reliability and a decrease in maintainability due to high density mounting while maintaining high-density mounting.

Also, by consolidating the configuration around the water in the first storage space in the housing 14A, it is separated from other main circuit supplies other than water cooling, and the second main circuit space is provided in the other third main circuit space. By adopting a configuration in which the surroundings of the water are not mixed, the possibility and range of water being applied to other main circuit components can be minimized even if water leakage occurs, and the reliability of water can be improved.

Further, in the storage space of the water cooling unit 21 (first storage space), each water cooling unit 2
The main cooling water pipes 23 and 24 for supplying and draining water to the water cooling unit 1 are arranged at the top and bottom right and left sides of the front of the housing.
The branch pipe 25 supplied to the water cooling unit 21 is formed into a U-shape, and the branch pipe is intentionally shaken from the front of the board to the last joint of the water cooling unit 21.

With such a configuration, the water pipes 23 and 24 come to the first storage space, so that the water system can be further concentrated and the air release cock 26 above the main water pipes 23 and 24 is evacuated. In this case, it is possible to perform air bleeding while checking the air bubbles inside the pipe in the water cooling unit 21, and it is possible to check the degree of air bleeding in the piping at once from the front side of the housing.

The branch pipes 80 for supplying the water cooling units 21 from the water main pipes 23 and 24 are U-shaped, and the U-shaped branch pipes 25 are connected to the front and rear of the water cooling units 21 from water supply / drain ports located at the left and right rear portions, respectively. Water pipes 23, 24
By adopting the configuration, the length of the branch pipe can be increased, and the water used for cooling has both roles of cooling and insulation. In particular, for insulation, the main circuit section (charging section) is used for cooling. Since pure water is used as water and the purity of the water is increased to insulate the water directly, the resistance of pure water inside the pipe can be secured as a high resistance value by its length. By making the most of the flexibility of the U-shape, the stress at the time of detaching and attaching the water cooling unit 21 and the branch pipe 25 can be absorbed without difficulty, and a configuration that can be easily detached can be realized.

FIG. 3 is a diagram viewed from the DD direction in FIG.
It is the figure which showed the board back. As shown in the drawing, main circuit components (DC capacitor 20, main circuit bus 22) other than water cooling are stored in a second storage space obtained by dividing the inside of the housing 14 into three parts, and each of the water cooling units in the first storage space is stored. Unit 21
The DC capacitor 20 required for the DC cooling unit 21 is separated into P and N poles in the second space on the back of each water cooling unit 21 and arranged right and left in the immediate vicinity of the unit. 22 is arranged.

With such a configuration, the DC condenser 2 necessary for the water cooling unit 21 corresponding to each phase is provided.
0 is separated into the P pole and the N pole in the second space on the back side of each phase water cooling unit 21 and arranged on the left and right in the immediate vicinity of the water cooling unit 21, and the wiring length from the water cooling unit 21 to the DC capacitor 20 is minimized. By arranging the DC buses 22 above and below between the left and right P-pole and N-pole capacitors 20, main circuit components other than water cooling can be disposed in the second storage space in the housing.

The third storage space, which is obtained by dividing the inside of the housing into three parts, is completely reserved on the rear side of the panel as a space exclusively used for input and output of external cables, so that it can easily cope with upper and lower cables. It has become. By adopting such a configuration, it is possible to easily cope with the cable being pulled in up and down, and it is possible to realize separation of the internal water system portion and the external line connection portion.

Furthermore, in the main water pipes 23 and 24 for supplying and draining water to the water cooling units 21 arranged on the left and right of the first storage space in the housing,
Reference numerals 3 and 24 are L-shaped. The L-shape is defined as the third storage space (input / output space with the outside) in the housing, which extends from the left and right sides of the floor toward the front of the panel, and rises at the front of the panel (the first space for unit storage). The water supply and drainage connection with the outside of the water can be handled in the third storage space (input / output space with the outside). Further, the second storage space is completely separated from the electric appliances other than the water-cooled electric appliances stored in the second storage space by passing through the floor surface.

With such a configuration, in the second storage space, electric appliances (such as the DC capacitor 20 and the DC bus 22) other than water-cooled stored in the second storage space by passing through the floor surface. And the reliability is improved by being completely separated from the outside, and the external connection position of the left and right water pipes in the housing is also in the third storage space (input / output space). Connections can be separated.

[0035]

As described above, according to the present invention,
When increasing the capacity of the power conversion device, it is possible to easily cope with the multi-capacity by arranging one housing terminated as a circuit on multiple sides, which can contribute to the standardization of the device, and the water system can be used in areas where water cooling is unnecessary. It can be separated from the main circuit. In addition, the panel structure accommodating a plurality of water-cooled units can be made compact, the water system and the external connection part can be separated, and the equipment arrangement area can be clarified, thereby providing a power converter with excellent reliability around water. .

[Brief description of the drawings]

FIG. 1 is a layout diagram showing a main circuit and a board division of a power converter according to an embodiment of the present invention.

FIG. 2 is a right side view of the board of FIG.

FIG. 3 is a rear view as seen from a DD direction of FIG. 1;

FIG. 4 is a layout diagram showing a main circuit and a board division of a conventional power converter.

FIG. 5 is a left side view of the board of FIG. 4;

[Explanation of symbols]

1: thyristor, 2: capacitor, 3: thyristor, 4
..., 5 ..., 6, 7 ... water pipe, 8 ... branch pipe, 9 ... air release cock, 10, 30 ... unit, 11 ..., 12 ...,
13, 13A, 13B, 13C, 13D, 13E ... housing, 14 ..., 15 ..., 16 ..., 17 ..., 18 ..., 20 ...
DC capacitor, 22 ... DC bus, 21 ..., 23, 24
… A water pipe.

Claims (6)

[Claims] 1. A power conversion device comprising a housing in which a plurality of conversion circuits for converting alternating current to direct current or direct current to alternating current are housed in units, wherein the inside of the housing is viewed from front to back. Divide and store each of the units in the first space on the front, house main main circuit equipment such as DC bus and DC capacitor in the second space, and connect external cable to the last third space. A power conversion device containing an output unit. 2. When each of the plurality of units is water-cooled, the water-cooling component is stored in a first space in the front of the housing, and the arrangement of the water-cooling component is separated from a main circuit component other than the water-cooling component, and other storage is performed. 2. The power converter according to claim 1, wherein a space around the water such as a water cooling pipe is not mixed in the space. 3. A first space for storing a water-cooling unit is provided with main water supply pipes for supplying and discharging water to each unit, respectively, and vertically arranged from the floor surface to the ceiling direction on the front left and right sides of the housing. The branch pipe shape supplied from the water main pipe to each water cooling unit is U-shaped, and the U-shaped branch pipe is brought to the water main pipe on the front surface of the housing from the water supply and drain ports respectively located at the left and right rear portions of each water cooling unit. The power converter according to claim 1 or 2, wherein 4. A main circuit product storage space other than the second water cooling product in the housing is provided with a DC capacitor required for each unit of the storage space first unit and a P-pole and an N-pole for a second space on the back of each unit. The power converter according to any one of claims 1 to 3, wherein a DC bus is vertically arranged between the DC capacitors that are separated and arranged on the left and right, and are separately arranged on the left and right. . 5. The third external cable I / O space in the housing is divided into three parts from the front, so that a space exclusively for external cable I / O is completely secured on the rear side of the panel. The power converter according to any one of claims 1 to 4, wherein 6. A main water pipe for supplying and discharging water to each unit disposed on the left and right of the first storage space in the housing, wherein the water pipe has an L-shape. It has a water main pipe whose bottom is extended toward the front of the panel so as to follow the floor of the third storage space in the housing, and stands vertically at the front of the panel in the first space of the unit storage. The power converter according to any one of claims 1 to 5.