JP2011135643A - Power converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To a power converter capable of miniaturizing a device while coping with leakage of cooling water from each unit inverter, connection line maintenance, and easy inspection of laying inspected easily, and taking heat measures against thermally sensitive goods. <P>SOLUTION: An enclosure 106 stores an input transformer 105 and unit inverters 103u, 103v, 103w composed of a switching element cooled by cooling water, a rectifier, and a smoothing capacitor while stacking the unit inverters 103u, 103v, and 103w vertically by providing a partition board 2 therebetween. The partition board 2 is in a tray shape including a bank-like section 3 in an outer edge portion, has a shape larger than a projection surface when the unit inverters 103u, 103v, 103w are viewed from above, and attaches a connection line 110 between the input transformer 105 and the unit inverters 103u, 103v, 103w. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power conversion device in which an inverter cooling method is a water cooling method.

  Currently, power converters such as uninterruptible power supplies, converters, and drive devices generally have a circuit configuration that uses a switching element for an inverter that performs power conversion. In order to meet the demands for larger currents and more multiplexed elements and further downsizing of the apparatus, the cooling method is a water cooling method to remove generated heat (for example, see Patent Document 1). Further, most of the heat generated in the power conversion device is occupied by an inverter using a high-speed switching element, and there are those shown in FIGS. 7 and 8 as a power conversion device configured to cool the inverter by a water cooling method.

  That is, in FIGS. 7 and 8, the power conversion device 101 directly drives a high voltage AC motor 102 such as a 3 kV system or a 6 kV system, and a three-phase output inverter 103 is a plurality of units that are multiples of 3. Inverters 103u, 103v, and 103w are connected in series for each phase, and these are connected to the input transformer 105 that receives power supply from the power supply 104 and transforms it to output a high voltage to the load. Yes. Note that the unit inverters 103u, 103v, and 103w are each composed of a switching element, a rectifier, a smoothing capacitor, and the like, and the switching element is cooled by a water cooling circuit (not shown) through which cooling water flows. ing.

  In addition, the power conversion device 101 is configured by housing an inverter 103 on one side and an input transformer 105 on the other side in a metal enclosure 106 whose exterior portion is not shown in FIG.

  In the inverter 103 housed inside one side of the enclosure 106, the unit inverters 103u, 103v, 103w for each phase are, for example, the unit inverter 103u for the U phase at the top, and the unit inverter 103v for the V phase below it. The W-phase unit inverters 103w are arranged at the bottom so as to be stacked in three stages in the vertical direction. Further, in the left-right direction, unit inverters 103u, 103v, 103w of each phase are arranged so that a plurality of, for example, three units having the same phase are arranged, and unit inverters 103u, 103v, 103w of the same phase arranged in the left-right direction are arranged in series. Connected. The outputs of the respective phases from the unit inverters 103u, 103v, 103w of the respective phases connected in series in the left-right direction are connected to be output to the AC motor 102 as a load through the output line 107.

  Further, the power converter 101 is provided with a water tray 108 at each lower position of the unit inverters 103u, 103v, 103w accommodated in the enclosure 106 so as to be stacked in the vertical direction. Even if one water leak occurs, the unit inverter on the lower side is prevented from getting water. Furthermore, the power converter 101 is provided with a cradle 109 at a position below each of the water trays 108. Between the water tray 108 and the cradle 109, each unit inverter 103u, 103v is connected from the input transformer 105. , 103w are provided so as to be laid on each cradle 109 in order to facilitate maintenance and inspection.

  However, in the above-described power conversion device 101, the switching elements of the unit inverters 103u, 103v, and 103w are cooled by cooling water. However, for products other than the switching elements, the generated heat is provided on the ceiling of the enclosure 106. When the enclosure 106 is made smaller in response to the further demand for downsizing of the apparatus, the generated heat discharged from the lower unit inverter is reduced. When it hits the upper unit inverter, it becomes more severe thermally. In addition, since the unit inverters 103u, 103v, and 103w normally have the same configuration, each product is located at the same position. Therefore, in a position where a thermally severe product is provided, the upper and lower parts Thermally harsh items are arranged in the direction, and heat concentrates on this arrangement part, which increases the thermal harsh situation.

  Further, in the power conversion device 101 described above, even if the cooling water used for cooling the switching elements of the unit inverters 103u, 103v, and 103w leaks, the unit inverter on the lower side gets wet. In order to prevent this, a water tray 108 is required at each lower position, and a cradle 109 is required for laying the connecting wire 110. To secure these spaces, the size of the enclosure 106 can be made smaller. Has become very difficult.

JP 2008-161005 A

  The present invention has been made in view of the above situation, and its purpose is to cope with cooling water leakage from each unit inverter, maintenance of connection lines, and laying that is easy to check, It is another object of the present invention to provide a power conversion device that can reduce the size of the device while taking measures against heat for thermally severe products.

  The power converter of the present invention includes an input transformer and a plurality of unit inverters configured by providing a switching element, a rectifier, and a smoothing capacitor cooled with cooling water in an enclosure, with a partition plate in the vertical direction. It is a power conversion device that is arranged and stored so as to overlap the unit inverter, and the partition plate has a dish shape having a bank-like portion on an outer edge portion, and when the unit inverter is viewed from above It has a shape larger than the projection surface, and a connection line between the input transformer and the unit inverter is attached.

Furthermore, the partition plate is formed of an electrically insulating material,
Furthermore, the partition plate is characterized in that a crossing portion of the connecting line of the bank-like portion is cut out,
Furthermore, the partition plate is provided so as to be inclined so that a portion in which at least one bank-like portion is cut out is a lowest position.

  According to the present invention, it is possible to cope with a cooling water leak from each unit inverter, it is possible to cope with maintenance of connection lines and laying that can be easily inspected, and sufficient heat countermeasures are taken for thermally severe products. Thus, the enclosure can be reduced in size and the apparatus can be miniaturized.

1 is a perspective view showing a first embodiment of the present invention. It is a perspective view of the principal part in FIG. It is a perspective view which shows the 2nd Embodiment of this invention. It is a perspective view of the principal part in FIG. It is a perspective view which shows the modification of the 2nd Embodiment of this invention. It is a perspective view of the principal part in FIG. It is a perspective view which shows a prior art. It is a circuit diagram of a power converter.

  Embodiments of the present invention will be described below with reference to the drawings. In the present invention, the configuration between unit inverters adjacent in the vertical direction is different from that of the above-described conventional technology. The same parts as those in the conventional technology are denoted by the same reference numerals, and the description thereof is omitted. The configuration of the embodiment of the invention will be described.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the power conversion device 1 directly drives a high-voltage AC motor 102 such as a 3 kV system or a 6 kV system, for example, similar to that shown in the related art. Unit inverters 103u, 103v, and 103w, which are multiple times, are connected in series for each phase to form a three-phase output inverter 103. This inverter 103 is connected to the input transformer 105, and the resulting high voltage is It is made to output via the output line 107 to the high voltage alternating current motor 102 of a load. The inverter 103 and the input transformer 105 are made of metal and have a rectangular parallelepiped shape. The inverter 103 is housed on one side of the enclosure 106 provided with a door (not shown) that can be opened and closed, and the input transformer 105 is placed on the other side. It is stored.

  In addition, each unit inverter 103u, 103v, 103w which comprises the inverter 103 is comprised from articles | goods, such as a switching element, a rectifier, and a smoothing capacitor, respectively, and the switching element is cooled with cooling water, About the articles | goods accommodated in the enclosure 106 other than a switching element, the generated heat is discharged | emitted with the ventilation fan not shown provided in the ceiling of the enclosure 106, and air-cools.

  The inverter 103 housed on one side of the enclosure 106 includes unit inverters 103u, 103v, and 103w for each phase, for example, the U-phase unit inverter 103u at the top and the V-phase unit inverter below it. 103v, and arranged so as to be stacked in three stages in the vertical direction so that the W-phase unit inverter 103w is located at the bottom. Further, in the left-right direction, the unit inverters 103u, 103v, 103w of each phase are arranged so that there are a plurality of, for example, three in-phase units, and the unit inverters 103u, 103v, 103w of the same phase arranged in the left-right direction are arranged in series. Connected.

  Furthermore, in the power converter 1, the partition plates 2 are horizontally provided at positions below the unit inverters 103u, 103v, and 103w that are accommodated in the enclosure 106 so as to be stacked in the vertical direction. The partition plate 2 has a dish shape made of an electrically insulating material having a low thermal conductivity and a heat insulation property. The partition plate 2 has a bank-shaped portion 3 around the entire outer edge portion. The shape is larger than the projection plane when 103u, 103v, and 103w are viewed from above. Further, between the unit inverters 103u, 103v, 103w and the partition plate 2 at the lower position thereof, connection lines 110 for supplying power from the input transformer 105 to the unit inverters 103u, 103v, 103w are respectively connected to the partition plates 2. It is laid so that it can be mounted on top.

  In the power conversion device 1 configured as described above, the switching element of the inverter 103 is normally forcibly cooled with cooling water, and the ventilation fan is operated to forcibly cool the interior of the enclosure 106 and each product by air cooling. The device is operated while cooling. In addition, during operation, the partition plate 2 having heat insulation is provided between the unit inverters adjacent to each other, so that the upper unit inverter can Even if the product is heated and is in a thermally severe state, and even if the thermally severe product is arranged in the vertical direction, the product is not in a thermally severe state.

  Also, if some abnormality occurs and the cooling water that cools the switching element leaks out of the cooling circuit, the dish-shaped partition plate that is larger than the unit inverter provided below the unit inverter where the cooling water leaks The water leaked in 2 is received, the accumulated water does not leak downward, and the unit inverter on the lower side does not get wet.

  As described above, according to the power conversion device 1 described above, the partition plates 2 are horizontally provided at the lower positions of the unit inverters 103u, 103v, and 103w that are accommodated so as to be stacked in the vertical direction. The distance between unit inverters adjacent in the direction can be reduced by reducing the possibility of electrical and thermal harsh conditions due to water leakage and heat generation of the product, and even if the interval between unit inverters is narrow, A connection line 110 that connects the input transformer 105 and each unit inverter 103u, 103v, 103w is attached to each partition plate 2 and laid at a fixed position, so that the enclosure 106 can be made compact so as to ensure a sufficient insulation distance. Can be

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4, and a modified embodiment of the present embodiment will be described with reference to FIGS. In this embodiment, since the partition plate is different from the partition plate 2 in the first embodiment described above, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. A configuration of the present embodiment that is different from the first embodiment will be described.

  As shown in FIGS. 3 and 4, the power conversion device 11 houses an inverter 103 composed of unit inverters 103 u, 103 v, and 103 w, for example, a multiple of 3 in an enclosure 106, as in the first embodiment. Configured. And the partition plate 12 is horizontally provided in the downward position of each unit inverter 103u, 103v, 103w accommodated in the enclosure 106 so that it may overlap in an up-down direction.

  The partition plate 12 has a substantially dish shape made of an electrically insulating material having a small thermal conductivity and a heat insulating property. The partition plate 12 has a bank-shaped portion 13 at an outer edge portion. A cutout portion 14 is formed by cutting out the portion. The partition plate 12 has a size larger than the projection plane when the unit inverters 103u, 103v, 103w are viewed from above, and the unit inverters 103u, 103v, 103w and the partition plate 12 at a position below the unit inverters 103u, 103v, 103w. Between them, a connection line 110 connecting the input transformer 105 and each unit inverter 103u, 103v, 103w is arranged, and each connection line 110 is fitted in the notch part 14 of the bank-shaped part 13. Are attached and laid on each partition plate 12.

  In the power conversion device 11 configured as described above, as in the first embodiment, the switching element of the inverter 103 is always water-cooled, and the interior of the enclosure 106 and each product are air-cooled by a ventilation fan. To be cooled. Further, since the partition plate 12 having heat insulation is provided between the upper and lower adjacent unit inverters, the upper unit inverter becomes thermally severe due to the heat generated by the lower unit inverter, Even if the strict supplies are arranged in the vertical direction, the supplies will not become thermally severe.

  On the other hand, when some kind of abnormality occurs and the cooling water of the switching element leaks from the cooling circuit, the dish-shaped partition plate 12 is larger than the unit inverter provided below the unit inverter where the cooling water leaks. The leaked water is received and the water received by the partition plate 12 flows down from the notch 14 of the bank 13 to a predetermined position below and is drained, and even when the amount of water leakage is large, the unit inverter on the lower side Water is not splashed on.

  As described above, according to the power conversion device 11 described above, the partition plates 12 are horizontally provided at the lower positions of the unit inverters 103u, 103v, and 103w that are accommodated so as to be stacked in the vertical direction. As in the first embodiment, the interval between the unit inverters adjacent in the vertical direction can be narrowed by reducing the possibility of being in an electrically and thermally severe state due to water leakage or heat generation of the product. Even if the interval between the inverters is narrow, the connection line 110 that connects the input transformer 105 and each unit inverter 103u, 103v, 103w is attached to each partition plate 12 and laid at a fixed position. The enclosure 106 can be reduced in size so as to be ensured.

  In the above-described embodiment, the partition plate 12 is provided horizontally. However, the partition plate 12 may be configured as a modified power conversion device 11a illustrated in FIGS.

  5 and 6, the power conversion device 11a is provided at a position below each of the unit inverters 103u, 103v, and 103w so that the partition plate 12 is inclined in one direction where the cutout portion 14 is the lowest position. Other configurations are the same as those of the present embodiment. Note that the partition plate 12 is sufficiently larger than the unit inverters 103u, 103v, and 103w, and has a shape larger than the projection plane when the unit inverters 103u, 103v, and 103w are viewed from above even when they are inclined.

  Thereby, the heat of the unit inverter provided on the lower side flows smoothly without stopping according to the inclination of the partition plate 12, so that the heat is discharged smoothly. Does not become thermally severe. Even if there is a water leak in the upper unit inverter, the water leaked by the partition plate 12 is received, and the water received by the partition plate 12 is notched 14 in the bank-shaped portion 13 at the lowest position. Even when there is a large amount of water leakage, the unit inverter on the lower side is prevented from being splashed with water even when the amount of water leakage is large.

  As a result, even in the modified embodiment configured as described above, the same effects as those of the above-described embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1,11,11a ... Power converter, 2,12 ... Partition plate, 3,13 ... Bank-like part, 14 ... Notch part, 102 ... AC motor, 103 ... Inverter, 103u, 103v, 103w ... Unit inverter, 104 ... Power source 105 ... Input transformer 106 ... Enclosure 107 ... Output line 110 ... Connection line

Claims (4)

An input transformer and a plurality of unit inverters configured by providing switching elements, rectifiers, and smoothing capacitors cooled with cooling water are provided in the enclosure so as to overlap the unit inverters by providing a partition plate in the vertical direction. A power conversion device arranged and stored in
The partition plate has a dish shape having a bank-like portion at an outer edge portion, a shape larger than a projection surface when the unit inverter is viewed from above, and a connection line between the input transformer and the unit inverter. A power converter characterized by being attached.   The power converter according to claim 1, wherein the partition plate is made of an electrically insulating material.   The power converter according to claim 1, wherein a crossing portion of the connection line of the bank-shaped portion is cut out of the partition plate.   The power converter according to claim 3, wherein the partition plate is provided so as to be inclined so that a portion where at least one of the bank-like portions is cut out is a lowest position.

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