JP4525268B2 - Cooling device for power converter - Google Patents

Description

  The present invention relates to various types of electrical equipment such as a power converter composed of semiconductor elements such as an uninterruptible power supply, a circuit breaker that opens and closes and protects a power supply, a contactor that selects and switches electric circuits, and a transformer that converts voltage. The present invention relates to a power conversion device panel configured to be accommodated in one cubicle.

  FIG. 6 shows a general circuit configuration of the uninterruptible power supply.

  In FIG. 6, AC power from the commercial power source 1 is input to the power converter 24 through the breaker 27, the contactor 211, and the filter 215. The power converter 24 converts the AC power into DC power. And an inverter 242 for converting the DC power into AC power having a desired voltage and frequency. The AC power obtained by the power converter 24 is fed to the load 2 through the filter 216, the contactor 213, the breaker 28, and the output transformer 15. A circuit for supplying AC power from the commercial power source 1 to the load 2 through the power converter 24 will be referred to as line 1 below.

  When the load 2 is a load such as a computer that must avoid a power outage for an extremely short time, it is stored in the battery 23 when the commercial power source 1 is cut off due to a line failure (for example, a ground fault). The direct current power is supplied to the inverter 242 via the breaker 210 and the contactor 212, and the inverter converts the direct current power into alternating current power and supplies it to the load, so that the load 2 can be supplied without power failure.

  However, for example, if the inverter 242 of the power converter 24 fails, even if the commercial power source 1 and the battery 23 are healthy, AC power cannot be supplied to the load 2. Therefore, an AC switch circuit 25 configured by a parallel circuit of a semiconductor AC switch 251 and a contactor 252 configured by connecting anti-parallel thyristors is provided, and the optional transformer 14 installed only when necessary from the commercial power source 1, this AC A direct feed power supply circuit also serving as a maintenance bypass circuit connected to the output transformer 15 via the switch circuit 25 and the breaker 29 is provided.

  Normally, the AC switch circuit 25 is in an off state (breaker 29 is in an on state), and AC power is supplied from the power converter 24 to the load 2 (however, the output AC of the power converter 24 is synchronized with the commercial power source 1). However, when a failure occurs in the power converter 24, the output is immediately turned off, and the AC switch 251 is turned on, whereby the AC power is directly sent from the commercial power source 1 to the load 2. A power outage to the load 2 can be avoided. This direct feed circuit will be referred to as line 2 below.

However, if the power converter 24 or the AC switch 251 breaks down for a long time, power supply to the load 2 must be stopped. Therefore, these devices need to be regularly inspected and replaced. However, in the state where either line 1 or line 2 is operated, voltage is applied to the conductive wire portion that supplies power to the load. Therefore, if the AC switch 251 or the power converter 24 is maintained and inspected as it is, electric shock or the like may occur. There is danger.
Therefore, the parallel circuit of the AC switch 251 and the contactor 252 and the breaker 29 are collectively mounted on the AC switch base 25a to form a unit. The AC switch base 25a is provided with the power supply side connector 16 and the load side connector 17, and the commercial power source 1 By inserting this AC switch base into the line 2 between the load 2 and the load 2 so as to be detachable, the AC switch base 25a can be pulled out from the line 2 even when power is being supplied from the line 1. The AC switch 251 can be safely maintained and inspected.

The option transformer 14 is used only when necessary. That is, when the commercial power source 1 is the power source of the power converter 24 and the power source of the direct power feeding / maintenance circuit, the optional transformer 14 can be omitted.
The devices constituting the uninterruptible power supply circuit as described above are generally accommodated in one cubicle and constitute a power conversion device panel as shown in FIG. 7 (see Patent Document 1).

  In FIG. 7, a front door 50 is attached to a front opening of a rectangular cubic board 5 so as to be opened and closed. A base 51 is provided for installing the floor surface of the panel body 5. The inside of the panel body 5 is divided into two chambers 54a and 54b by a substantially vertical partition wall 53. A raised bottom plate 55 is provided at the bottom of the front chamber 54a, and a communication passage 56 formed between the bottom plate 55 and the bottom plate of the panel body 5 is communicated with the rear chamber 54b. Exhaust fans 57 and 58 are provided in the upper portions of the front and rear chambers, respectively. The front door 50 is provided with an appropriate number of ventilation openings (not shown), and communicates with the rear chamber 54b via the front chamber 54a or the communication passage 56, respectively.

  In the lower part of the front chamber 54a, an input / output unit 60 composed of switching devices such as the breakers 27 and 28 and the contactors 211 and 213 in FIG. A power conversion unit 70 composed of an AC switch base 25a, a converter 241, an inverter 242, and the like, which are integrated into a unit by incorporating the power supply side connector 16 and the load side connector 17, and disposed thereon A transformer section 90 provided with the transformers 14 and 15 and a conductive wire 15a for supplying power to the load is disposed below the chamber 54b. Since the input / output unit 60 is an operation unit mainly composed of a breaker, a magnetic contactor, and the like, it is disposed on the front side of the apparatus for convenient operation. The power conversion unit 70 is unitized by intensively mounting a semiconductor switching element such as an IGBT (insulated bipolar transistor) and electronic elements constituting a power conversion circuit such as a capacitor (not shown) on a mounting plate 81 with a cooling fin. ing. The electronic element is disposed in the upper part because it generates a large amount of heat. The transformer unit 90 is also a heat generating unit, but is disposed in the lower portion of the rear chamber 54b because it is a heavy object and requires relatively little maintenance.

  In order to dissipate the heat generated mainly from the power conversion unit 70 and the transformer unit 90, the cooling air taken in from a ventilation port (not shown) of the front door 50 is convected from the lower part of the front chamber 54a as indicated by an arrow. As a result, the input / output unit 60 and the power conversion unit 70 are brought into contact with the input / output unit 60 and are lifted while taking heat away from the input / output unit 60 and discharged from the exhaust port of the ceiling. At that time, the exhaust fan 57 provided on the ceiling forcibly promotes the circulation of the cooling air. Further, the cooling air taken in from the vent hole (not shown) of the front door 50 flows upward after entering the lower portion of the rear chamber 54b through the communication passage 56 as shown by the arrow, and comes into contact with the transformers 15 and 14 to It rises while taking heat away and is discharged to the outside through the exhaust port of the ceiling. At that time, the exhaust fan 58 provided on the ceiling forcibly and accelerates the rise of the cooling air.

By configuring the power conversion device panel in this way, the conductive line 15a for supplying power to the load 2 from the line 1 via the power converter 24 or the line 2 via the AC switch circuit 25 is provided together with the transformers 14 and 15 in the front chamber 54a. 6 is housed in a rear chamber partitioned by a partition wall 53, and the power supply line 15a in the rear chamber 54b cannot be touched from the front chamber 54a. By turning off the breakers 27 and 28, maintenance and inspection of the power converter 24 can be performed safely.
JP-A-9-213532

  As described above, in the conventional power conversion device panel, even when power is supplied from either one of the lines 1 and 2 in order to prevent the occurrence of a power failure, the power of the line on the side where the power supply is stopped is stopped. Maintenance and inspection of equipment such as a converter or an AC switch circuit can be performed safely.

  However, in this conventional apparatus, the exhaust fan is provided in each of the two compartments to cool each device, so that the capacity of each device is increased for each room and the capacity of the cooling fan is increased. There is a need. Accordingly, the cooling fan becomes large and cannot be installed in the limited installation space, so that an increase in the capacity of the apparatus is also limited. For this reason, in particular, the power conversion equipment has a disadvantage that capacity is limited due to insufficient cooling due to a large amount of heat generation.

  Accordingly, an object of the present invention is to obtain a power conversion device panel having a direct feed circuit that can increase the amount of cooling air to the power converter to increase the capacity of the power converter or increase the overload capability. Is.

In order to solve the above-mentioned problem, the invention of claim 1 is characterized in that a device that constitutes a circuit that feeds power from a commercial power source to a load via a power converter and a device that constitutes a direct feed power feeding circuit that feeds power directly are opened and closed. In the power conversion device panel housed in a cubicle closed by the above, a partition chamber partitioned by a partition wall is provided at the lower rear part in the panel, and at least the output transformer and the conductive wire to the outside are stored in the partition chamber, A power converter is installed in the upper part of the compartment, and a wind tunnel that wraps the cooling fins of the power converter and leads to the ceiling exhaust port and an exhaust ventilation path that communicates with the ceiling exhaust port are provided on the back side of the power converter. Furthermore, a cooling fan for cooling the power converter that sucks air from the compartment and blows air to the wind tunnel between the compartment and the power converter, and a cooling fan for transformer cooling that blows air to the exhaust ventilation path Together provided in parallel, said tilted so that part of the vertical wall of the air channel surrounding the cooling fins of the power converter to expand ventilation passage sectional area of the air channel towards the bottom, said inlet opening of said air channel The transformer cooling fan is spread so as to partially cover it, and a part of the air blown by the transformer cooling fan is sent to the wind tunnel .

  According to the present invention, not only the cooling fan for the power converter but also a part of the cooling air is sent from the cooling fan for cooling the transformer to the wind tunnel that wraps the cooling fin for cooling the power converter. Therefore, the cooling effect of the power converter is enhanced, and the capacity of the power converter can be increased or the overload capability can be increased. Then, by tilting the vertical wall of the wind tunnel toward the lower part so that the cross-sectional area of the wind tunnel is enlarged, the flow velocity of the cooling air is increased at the position of the electronic elements placed above the power converter. Therefore, the cooling effect in this part is further increased.

  Embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show an embodiment of a power converter panel according to the present invention.

1 to 3 show the appearance of the board, FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a plan view. In these drawings, reference numeral 30 denotes a cubicle-shaped board body, and 31a and 31b are front doors having a two-piece structure provided in the front opening so as to be opened and closed. Below the front doors 31a and 31b, vent holes 32a and 32b opened in a grill shape are provided, from which outside air is sucked into the panel as cooling air (see FIG. 1). The ceiling plate of the board is provided with an exhaust port 33 closed with a wire mesh (see FIG. 3).
In this panel, a power conversion unit and a direct feed circuit unit in a dotted frame A constituting the uninterruptible power supply shown in FIG. 6 are incorporated. 4 is a side sectional view taken along line IV-IV in FIG. 1, and FIG. 5 is a front sectional view taken along line V-V in FIG. These figures show the mounting configuration of the devices in the board.

  Each device in FIGS. 4 and 5 is given the same reference numeral as the corresponding device in FIG.

  As is clear from FIGS. 4 and 5, the lower part in the panel main body 30 is partitioned by a partition wall 34, and inside thereof are the transformers 14 and 15 in the dotted frame B of FIG. A compartment 34a is provided for accommodating a conductive wire or the like for supplying power to the load. A partition 34 constituting the compartment 34a is partially provided with an opening (not shown) so that the compartment 34a communicates with the inside of the panel so that air can flow therethrough. In order to prevent parts such as equipment mounting screws from entering, they are closed with a relatively fine wire mesh to prevent human hands and foreign objects from coming into contact with charged parts such as conductive wires in the compartment. . A breaker 27 for controlling the opening and closing of the circuit, a contactor 211, and the like are installed in a space around the compartment 34a. An AC switch base 25a, in which the AC switch circuit 25 and the breaker 29 are integrated as a unit, is attached to the partition wall 34 on the upper front surface of the compartment 34a via detachable connectors 16 and 17.

  In the upper part of the panel body 30, a power conversion unit unit 24 a configured by integrating the converter 241 and the inverter 242 of the power converter 24 is installed at the rear part, leaving the exhaust air passage 36 for cooling air. On the rear surface facing the exhaust passage 36 of the power conversion unit 24a, there is provided a wind tunnel 35 that surrounds the cooling fins 24b coupled to the cooling substrate on which the semiconductor elements constituting the power converter are attached and guides the cooling air.

  Cooling fans 37 and 38 are installed between the compartment 34a and the power conversion unit 24a so as to face the wind tunnel 35 and the exhaust passage 36. The cooling fan 37 sucks air from the compartment 34 a and sends it to the wind tunnel 35 to cool the power converter 24. The cooling fan 38 sucks air from the compartment 34 a and sends it to the exhaust passage 36 to mainly cool the transformers 14 and 15.

  The vertical front wall 35a of the wind tunnel 35 that surrounds the cooling fin 24a that cools the power converter 24 is inclined so that the cross-sectional area of the ventilation path increases from the middle toward the lower end side. As a result, the cooling air inlet opening 35 b at the lower end of the wind tunnel 35 extends to a position partially covering the upper part of the transformer cooling fan 37.

  With this configuration, the transformer 14 and 15 for supplying power to the load 2 from the line 1 via the power converter 24 or the line 2 via the AC switch circuit 25 is housed in the compartment 34a partitioned by the partition wall 34. Since the unillustrated conductive wire or the like cannot be touched from the outside, maintenance and inspection of the power converter 24 can be safely performed by turning off the breakers 27 and 28 of the power converter in FIG. 6 even during direct power feeding. It can be carried out.

  Further, when the cooling fans 37 and 38 are operated, as indicated by arrows in FIG. 4, outside air is sucked into the panel from the ventilation openings of the front doors 31a and 31b of the panel body 30, and the cooling fan 37 and 38 is sent as cooling air to the wind tunnel 35 and the exhaust passage 36 for cooling the power converter 24 and exhausted from the exhaust port 33 of the ceiling plate of the panel, whereby various devices in the panel and the transformer in the compartment 34a. And the power converter 24 at the top of the panel is cooled. At this time, since the front wall 35a of the wind tunnel is inclined and the cooling air inlet opening at the lower end of the wind tunnel is enlarged, not only from the power converter cooling fan 37 but also from the transformer cooling fan 38 in the wind tunnel 35. Since a part of the cooling air to be sent is sent, the amount of the cooling air sent into the wind tunnel 35 increases. Therefore, the cooling effect of the power converter 24 is enhanced and the temperature rise of the power converter 24 is suppressed, so that the output capacity can be increased and the overload capability can be increased.

  By inclining the portion below the middle of the front wall of the wind tunnel 35, the cross-sectional area of the ventilation path at the top of the wind tunnel 35 is narrowed, so that the flow velocity of the cooling air is increased in the portion where the cross-sectional area of the ventilation path is narrowed. As a result, the cooling effect of the power converter 24 can be enhanced, so that the power converter 24 can be cooled well.

The front view which shows the external appearance of the Example of this invention. The side view which shows the external appearance of the Example of this invention. The top view which shows the external appearance of the Example of this invention. FIG. 4 is a side sectional view taken along line IV-IV in FIG. Front sectional drawing of the VV line | wire of FIG. The block block diagram circuit of the power converter which comprises a general uninterruptible power supply. Side surface sectional drawing which shows the conventional power converter device panel.

Explanation of symbols

14, 15: Transformer 24: Power converter 24b: Cooling fin 30: Panel body 34a: Compartment 35: Wind tunnel 36: Exhaust air passage 37, 38: Cooling fan

Claims (1)

A power conversion device in which a device that constitutes a circuit that feeds power from a commercial power source to a load via a power converter and a device that constitutes a direct feed power supply circuit that directly feeds power are housed in a cubicle whose front face is closed by an open / close door In the panel, a partition room partitioned by a partition wall is provided in the lower rear part of the panel, and at least an output transformer and an external conductive wire are accommodated in the partition room, and a power converter is installed in the upper part of the partition room. Provided on the back side of the power converter is a wind tunnel that wraps the cooling fins of the power converter and communicates with the exhaust outlet of the ceiling, and an exhaust ventilation path that communicates with the exhaust outlet of the ceiling, and further between the compartment and the power converter cold of the power converter with the respective provided in parallel with transformer cooling fan for blowing the power converter cooling fan for blowing air to the suction and the air channel to the exhaust air passage from said compartment A part of the vertical wall of the wind tunnel that wraps the fins is inclined downward so that the cross-sectional area of the wind tunnel increases, and the opening at the entrance of the wind tunnel is partially extended above the cooling fan for the transformer cooling. The power conversion device panel is characterized in that a part of the air blown from the cooling fan for transformer cooling is sent to the wind tunnel .

Images