JP4819457B2 - Condensation prevention system for inverter device - Google Patents

Description

  The present invention relates to a dew condensation prevention system for an inverter device, and more particularly, to a dew condensation prevention device for an inverter device for preventing dew condensation generated on a fin for cooling a switching element in the inverter device.

  As an example of a conventional inverter device, the one shown in FIG.

  This inverter device includes a cooling fin 2 that cools the heat generated by the IGBT 8 that is a switching element by circulation of a liquid supplied from the outside of the inverter device, and a secondary liquid cooling pump that circulates the cooling liquid of the cooling fin of the inverter device. 13, a heat exchanger 11 for exchanging heat of the coolant from the cooling fins of the inverter device with the primary coolant, a 1 coolant pump 12 for circulating the primary coolant, and an inverter An intake port 5 for taking in the outside air of the inverter device for dissipating heat generated at least by the control device 6, the capacitor 7, the electric wire 14, etc. disposed at a position excluding the upper direction of the cooling fin in the device, and the intake air It consisted of an exhaust port 10 and a cooling fan 9 for discharging the air sucked from the port to the outside of the inverter device.

  According to the conventional inverter device, in order to cool the heat generated in the inverter device, the cooling fin 2 cools the heat generated by the switching of the IGBT 8 by physically bringing the IGBT 8 as a switching element into contact with the cooling fin. is doing.

Moreover, the cooling fin 2 cools the cooling fin by circulation of the secondary coolant supplied from the outside of the inverter device. The secondary side liquid cooling pump 13 circulates the secondary cooling liquid supplied to the cooling fins of the inverter device. The heat exchanger 11 exchanges heat of the secondary coolant from the cooling fins 2 of the inverter device with the primary coolant. The primary side cooling pump 12 circulates the primary coolant and wastes heat outside. The intake port 5 takes in the outside air of the inverter device in order to dissipate heat generated at least by the control device 6, the capacitor 7, the electric wire 14, and the like disposed at positions excluding the upward direction of the cooling fins in the inverter device. The exhaust port 10 and the cooling fan 9 exhaust the air that has been cooled by flowing the air sucked from the intake port 5 through the control device 6, the capacitor 7, and the electric wire 14 to the outside of the inverter device.
JP-A-9-107683

  However, the conventional inverter device has the following problems.

  The heat generated by the IGBT 8 as the main circuit element is cooled by the cooling fin 2. On the other hand, the heat generated by at least the control device 6, the capacitor 7, the electric wire 14 and the like arranged at positions other than the upper direction of the cooling fin in the inverter device cannot be ignored in the inverter device having a large capacity. If the closed structure without air cooling is used, the temperature in the panel in the inverter device rises. Generally, the capacitor and the electronic parts used in the inverter device accelerate according to Arrhenius's law and the failure rate increases.

  For this reason, it is necessary to dissipate heat generated by other than the cooling fins of the inverter device. In general, this part is cooled by supplying air from the outside of the inverter device.

  In this inverter device, when the temperature of the cooling fin 2 is low and the intake air from the intake port 5 is high and the intake air at the intake port 5 is at a high temperature, condensation occurs on the cooling fin 2. Since the applied voltage is high at the switching element portion of the cooling fin of the inverter device, there is a problem that when condensation occurs, the insulation resistance decreases or a short circuit occurs in the IGBT 8 which is the main circuit element.

  The present invention has been made in view of the above, and an object of the present invention is to provide a dew condensation prevention system for an inverter device that can prevent dew condensation generated on fins that cool switching elements provided inside the inverter device. It is to provide.

In order to solve the above-mentioned problem, the invention according to claim 1 is a dew condensation prevention system for an inverter device that cools the fins for cooling the heat generated from the switching elements of the inverter device by circulation of liquid supplied from the outside. A cooling fin for cooling the heat generated by the switching element by circulation of a secondary cooling liquid supplied from the outside of the inverter device; a secondary liquid cooling pump for circulating the secondary cooling liquid to the cooling fin; and the cooling fin Except for the heat exchanger that exchanges heat generated by the coolant discharged from the primary coolant with the primary coolant, the primary coolant pump for circulating the primary coolant, and the upward direction of the cooling fins at least control device disposed in a position, a capacitor, in order to dissipate the heat generated by the wire, at least the control device, condenser, than the wire downwardly And arranged inlet for taking in outside air, said exhaust port for discharging the intake air to the outside from the air inlet, and a cooling fan for generating an air current discharged from the exhaust port to the intake from the intake port, an intake cooler for cooling by circulating air of the secondary cooling liquid from said inlet port, that the dew condensation water generated in the intake air cooler has and a condensed water discharge device for discharging to the outside of the inverter device The gist.

  In order to solve the above problems, the invention according to claim 2 is a first temperature detector for detecting the temperature of the cooling air from the intake air cooler, and the liquid temperature of the secondary cooling water discharged from the cooling fins. And a second temperature detector for detecting the flow rate of the secondary coolant supplied from the secondary liquid cooling pump to the cooling fin and the valve opening so as to bypass the secondary coolant to the heat exchanger. Based on the temperature of the cooling air detected by the first temperature detector and the discharge temperature of the cooling water detected by the second temperature detector, the temperature difference between them can be set within a set range. The gist of the invention is that it comprises a three-way valve control circuit for controlling the opening of the three-way valve so as to be inside.

  In order to solve the above-mentioned problem, the invention according to claim 3 is summarized in that the cooling fin is integrated with the intake air cooler.

  According to the first aspect of the present invention, the intake port for taking in the outside air of the inverter device is cooled by the intake air cooler that cools the intake air from the outside of the inverter device. Each device inside the inverter device is cooled by the air cooled by the cooler. Further, by discharging the dew condensation water generated by the intake air cooler to the outside of the inverter device, it is possible to prevent the dew condensation generated on the fins that cool the switching elements inside the inverter device.

  According to the second aspect of the present invention, the amount of the coolant supplied to the cooling fin by the three-way valve from the air temperature at the output of the intake air cooler and the liquid temperature at the output of the cooling fin that cools the switching element. By controlling the difference between the temperature of the cooling fin and the intake air cooler so as to match the set value, it is possible to accurately prevent the occurrence of condensation on the fin that cools the switching element inside the inverter device. .

  According to the present invention, the heat generation of the switching element is integrated with the cooling fin for cooling the liquid supplied from the outside of the inverter device and the intake air cooler for cooling the intake air from the outside of the inverter device. Air for cooling the intake air is cooled by the cooling fins, and each device inside the inverter device is cooled by the air after cooling. It is possible to prevent dew condensation that occurs on the fins that cool the switching elements inside the inverter device.

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

[Example 1]
FIG. 1 is a diagram illustrating a configuration of a dew condensation prevention system for an inverter device according to a first embodiment.

  As shown in FIG. 1, the inverter device 1 circulates cooling fins 2 that cool the heat generated by the IGBT 8 that is a switching element by circulation of the liquid supplied from the outside of the inverter device, and the cooling liquid of the cooling fins of the inverter device. A secondary liquid cooling pump 13 for heat exchange, a heat exchanger 11 for exchanging heat between the heat generated from the cooling fins of the inverter device and the primary cooling liquid, and for circulating the primary cooling liquid. In order to take in the outside air of the inverter device for radiating heat generated by at least the control device 6, the capacitor 7, the electric wire 14, etc. disposed at a position excluding the upper direction of the cooling liquid pump 12 and the cooling fin in the inverter device In addition to the intake port 5 and the exhaust port 10 and the cooling fan 9 for discharging the air taken in from the intake port to the outside of the inverter device, the inverter The intake air cooler 3 for cooling the intake air from the outside of the location 1, consists condensed water discharge device 4 for discharging the condensed water generated in the intake air cooling device 3 to the outside of the inverter device 1.

  In particular, the intake air cooler 3 cools the air that has cooled the intake air from the intake port 5 by blowing it to at least the control device 6, the capacitor 7, and the electric wires 14 that are disposed at positions other than the upward direction of the cooling fins in the inverter device. . The intake air cooler 3 cools the intake air cooler 3 itself by circulation of the secondary coolant supplied from the outside of the inverter device 1. The condensed water discharge device 4 discharges the condensed water generated in the intake air cooler 3 to the outside.

  Hereinafter, with reference to FIG. 1, the detailed operation | movement regarding the dew condensation prevention system of an inverter apparatus is demonstrated.

  In order to cool the heat generated in the inverter device 1, the cooling fin 2 cools the heat generated by the switching of the IGBT 8 by physically bringing the IGBT 8 as a switching element into contact with the cooling fin. The cooling fin 2 cools the cooling fin 2 itself by circulation of the secondary cooling liquid supplied from the outside of the inverter device. The secondary side liquid cooling pump 13 circulates the secondary cooling liquid supplied to the cooling fins of the inverter device 1. The heat exchanger 11 circulates the secondary coolant from the cooling fins 2 of the inverter device 1 to waste heat outside. The intake port 5 takes in the outside air of the inverter device.

  The intake air cooler 3 cools the air that has cooled the intake air from the intake port 5 by sending it to at least the control device 6, the capacitor 7, and the electric wires 14 that are arranged at positions other than the upward direction of the cooling fins in the inverter device. The intake air cooler 3 cools the intake air cooler 3 itself by circulation of the secondary coolant supplied from the outside of the inverter device 1. The condensed water discharge device 4 discharges the condensed water generated in the intake air cooler 3 to the outside.

  The exhaust port 10 and the cooling fan 9 exhaust the air after cooling the control device 6, the capacitor 7, and the electric wire 14 with air to the outside of the inverter device 1.

    According to the present embodiment, the intake port 5 for taking outside air into the inverter device 1 is cooled by the intake air cooler 3 that cools the intake air from the outside of the inverter device 1. Each device inside the inverter device 1 is cooled by the air cooled by the intake air cooler 3. Further, by discharging the condensed water generated in the intake air cooler 3 to the outside of the inverter device 1, it is possible to prevent the condensation generated in the cooling fin 2 that cools the IGBT 8 (switching element) inside the inverter device 1. it can.

[Example 2]
FIG. 2 is a diagram illustrating a configuration of a dew condensation prevention system for an inverter device according to a second embodiment.

  The characteristic of the second embodiment is that a three-way valve control circuit 14, a temperature detector 15a, a temperature detector 15b, and a three-way valve 17 are provided for the apparatus shown in the first embodiment.

  The temperature detector 15b detects the temperature of the air cooled by the intake air cooler 3. The temperature detector 15a detects the liquid temperature of the cooling fin 2 after cooling the IGBT 8 which is a switching element. The three-way valve control circuit 14 uses a subtractor to subtract the temperature difference between the temperatures detected by the temperature detector 15a and the temperature detector 15b so that the temperature difference between the temperature detector 15a and the temperature detector 15b becomes a set value. Further, this temperature difference is input to a subtracter, and a result value obtained by subtracting by a set value is input to an integrator Pl, and this output is output as an opening signal of the three-way valve 17. The three-way valve 17 adjusts the opening degree of the valve provided therein in accordance with a control signal from the three-way valve control circuit 14, the amount of coolant supplied from the three-way valve 17 to the cooling fin 2, and the heat exchanger The amount of the coolant supplied to 11 is variable.

  According to the present embodiment, the cooling supplied to the cooling fin by the three-way valve 17 from the air temperature at the output of the intake air cooler 3 and the liquid temperature on the output side of the cooling fin 2 that cools the IGBT 8 (switching element). By varying the amount of liquid, the valve opening of the three-way valve 17 is set so that the temperature difference between the temperature of the cooling air of the cooling fin 2 and the temperature of the secondary cooling liquid of the intake air cooler 3 becomes a set temperature value. Therefore, it is possible to accurately prevent the occurrence of condensation on the cooling fin 2 that cools the IGBT 8 inside the inverter device 1.

[Example 3]
FIG. 3 is a diagram illustrating a configuration of a dew condensation prevention system for an inverter device according to a third embodiment.

  The feature of the third embodiment is that the positions of the cooling fin 2a, the intake port 5 and the exhaust port 10 are changed as shown in FIG. 3 with respect to the apparatus shown in the first embodiment.

  The cooling fin 2 and the intake air cooler are integrated into a cooling fin 2a. In order to cool the heat generated in the inverter device, the cooling fin 2a cools the heat generated by the switching of the IGBT 8 by physically bringing the IGBT 8 as a switching element into contact with the cooling fin.

  Moreover, the cooling fin 2a cools the cooling fin 2a itself by circulation of the secondary coolant supplied from the outside of the inverter device.

  Further, the cooling fin 2 a cools the outside air from the intake port 5. The secondary side liquid cooling pump 13 circulates the secondary cooling liquid supplied to the cooling fins 2a of the inverter device. The heat exchanger 11 exchanges heat of the secondary coolant from the cooling fins 2a of the inverter device with the primary coolant. The primary side cooling pump 12 circulates the primary coolant and wastes heat outside.

  The intake port 5 takes in the outside air of the inverter device. The exhaust port 10 and the cooling fan 9 exhaust the air after cooling the control device 6, the capacitor 7, and the electric wire 14 with air to the outside of the inverter device. The dew condensation discharge device 4 discharges dew condensation water generated by the cooling fins 12a to the outside.

  According to the present embodiment, the cooling fin 2 that cools the heat generated by the IGBT 8 (switching element) by circulation of the liquid supplied from the outside of the inverter device 1, and the intake air cooler 3 that cools the intake air from the outside of the inverter device 1, The intake cooling air is cooled by the integrated cooling fins 9, and each device inside the inverter device 1 is cooled by the cooled air. It is possible to prevent dew condensation that occurs in the cooling fin 2 that cools the IGBT 8 inside the inverter device 1.

   As described above, according to the first to third embodiments, it is possible to prevent insulation failure caused by the condensation of the fins by preventing the condensation that occurs on the fins that cool the switching elements inside the inverter device. .

It is a block diagram which shows the form of Example 1 of this invention. It is a block diagram which shows the form of Example 2 of this invention. It is a block diagram which shows the form of Example 3 of this invention. It is a figure which shows the conventional inverter apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inverter apparatus 2 Cooling fin 2a Cooling fin 3 Intake cooler 4 Condensation water discharger 5 Inlet 6 Controller 7 Capacitor 8 IGBT
9 Cooling fin 10 Exhaust port 11 Heat exchanger 12 Primary cooling pump 13 Secondary cooling pump

Claims (3)

In the dew condensation prevention system of the inverter device that cools the fins for cooling the heat generated from the switching element of the inverter device by circulating the liquid supplied from the outside,
A cooling fin for cooling the heat generated by the switching element by circulation of a secondary coolant supplied from the outside of the inverter device;
A secondary liquid cooling pump for circulating a secondary cooling liquid through the cooling fins;
A heat exchanger for exchanging heat between the cooling liquid discharged from the cooling fin and the primary cooling liquid;
A primary liquid cooling pump for circulating the primary cooling liquid;
Intake air for taking in outside air arranged below at least the control device, the condenser, and the electric wire to dissipate heat generated at least by the control device, the condenser, and the electric wire arranged at positions excluding the upper direction of the cooling fin. Mouth ,
An exhaust port for discharging air that air from the intake port to the outside,
A cooling fan that generates airflow that is sucked from the air intake and exhausted from the exhaust ;
An intake air cooler that cools intake air from the intake port by circulation of the secondary coolant ;
Condensation prevention system of the inverter apparatus characterized by comprising a condensed water discharge device for discharging the condensed water generated in the intake cooler to the outside of the inverter device. A first temperature detector for detecting the temperature of the cooling air from the intake air cooler;
A second temperature detector for detecting a liquid temperature of the secondary cooling water discharged from the cooling fin;
A three-way valve capable of adjusting the opening of the valve so that the secondary cooling water supplied from the secondary liquid cooling pump flows into the cooling fin and bypasses the secondary cooling water to the heat exchanger;
Based on the temperature of the cooling air detected by the first temperature detector and the discharge temperature of the cooling water detected by the second temperature detector, the three-way valve adjusts the temperature difference between the two to be within a set range. A dew condensation prevention system for an inverter device according to claim 1, further comprising a three-way valve control circuit for controlling the opening degree of the inverter device.   The dew condensation prevention system for an inverter device according to claim 1, wherein the cooling fin is integrated with the intake air cooler.

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