JP2005110428A - Cooling device for power conversion elements - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool a plurality of power conversion elements, and to enhance the allowable amount of passage current of each power conversion element even if they are installed on one radiation fin, by reducing a temperature difference in air flowing through the radiation fin. <P>SOLUTION: A plurality of air inlets 2 and 3 are formed at the lower part of the radiation fin 6. Cool air is made to flow into the radiation fin 6 through the air inlets 2 and 3 by the negative pressure in the radiation fin 6, produced when a cooling fan 8, installed on the rear side of the radiation fin 6, is operated. Thus, a power conversion element 5 disposed on the rear side of the radiation fin 6 is forcedly cooled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power conversion element cooling apparatus used in an elevator system or the like, and more particularly to a power conversion element cooling apparatus configured to efficiently cool a plurality of power conversion elements.

  Conventionally, an apparatus shown in FIG. 22 is known as a power conversion element cooling apparatus used in an elevator system or the like.

A power conversion element cooling device 101 shown in this figure is disposed in an elevator system machine room or the like, and is attached to an inverter device or the like that supplies a drive current to a main motor or the like to control an inverter output current or a converter current. As shown in the front view of FIG. 23, a cylindrical radiating fin 104 that cools the power conversion elements 102, 103, etc., and attached to the front end side of the radiating fin 104, takes outside air and guides it into the radiating fin 104, A cooling fan 105 that assists heat dissipation of the radiation fins 104 and a cooling fan 106 that is attached to the rear end side of the radiation fins 104 and discharges air inside the radiation fins 104 to assist heat dissipation of the radiation fins 104 are provided. The inverter device starts driving the main motor and the like, and the temperature of each power conversion element 102, 103 When it rises, each cooling fan 105, 106 is activated, and air flows into the radiation fins 104 through the path of the outside → the front end side of the radiation fins 104 → the inside of the radiation fins 104 → the rear end side of the radiation fins 104 → the outside. Thus, the heat generated by each of the power conversion elements 102 and 103 is released to the outside so that the temperature of each of the power conversion elements 102 and 103 does not exceed a preset temperature.
International Publication No. WO00 / 39014 (Elevator Control Device)

  By the way, in such a conventional power conversion element cooling device 101, the heat of the heat radiation fins 104 is released to the outside by the two cooling fans 105 and 106 attached to one heat radiation fin 104, and the plurality of power conversion elements 102. , 103 is set so that the temperature does not exceed the specified temperature.

  However, the temperature of the heat radiating surface of the heat radiating fin 104 can be reduced in such a way that one of the cooling fans 105 sucks in the outside cold air and the other cooling fan 106 releases the air warmed in the heat radiating fin 104 to the outside. Although the power conversion element 102 installed on the air inflow side of the radiating fin 104 can efficiently dissipate heat, the power conversion element 102 installed on the air inflow side of the radiating fin 104 is heated. Since the air outflow side of the radiating fin 104 is warmed by the air, the power conversion element 103 installed on the air outflow side of the radiating fin 104 cannot be radiated efficiently, and the radiating fin 104 has a front half side. Compared to the energization allowable value of the attached power conversion element 102, Digit current allowable value of the power conversion device 103 is reduced, there is a problem that it is impossible to increase the output current of the inverter device.

  In view of the above circumstances, the present invention makes it possible to reduce the temperature difference of the air flowing inside the radiating fins and efficiently cool each power conversion element even when a plurality of power conversion elements are attached to one radiating fin. An object of the present invention is to provide a power conversion element cooling device capable of increasing the energization allowable amount of each power conversion element.

  In order to achieve the above object, according to the present invention, in the power conversion element cooling device for cooling a plurality of power conversion elements, one or more air inlets are formed in the side surface portion or the bottom surface portion. A cylindrical radiating fin that releases the heat of each power conversion element to the outside, an introduction-side cooling fan that is attached to one end of the radiating fin, takes in external air, and guides it into the radiating fin, and the radiating fin And a discharge-side cooling fan that discharges the air in the radiating fin to the outside.

  According to the above configuration, the outside air is introduced from the middle of the radiating fin to reduce the temperature difference of the air flowing through the radiating fin, and even when a plurality of power conversion elements are attached to one radiating fin, The power conversion element can be efficiently cooled, and the energization allowable amount of each power conversion element can be increased.

  Moreover, in Claim 2, in the power conversion element cooling device according to Claim 1, a wind introduction plate is provided in the air introduction port portion of the radiating fin, and the wind introduction plate passes through the air introduction port. The pressure loss of the air flowing into the heat radiating fin is reduced.

  According to the above configuration, when a large amount of outside air is introduced from the middle of the radiating fin, the temperature difference of the air flowing inside the radiating fin is further reduced, and a plurality of power conversion elements are attached to one radiating fin. However, each power conversion element can be efficiently cooled, and the energization allowable amount of each power conversion element can be increased.

  According to a third aspect of the present invention, in the power conversion element cooling apparatus for cooling a plurality of power conversion elements, one or more air introduction ports and one or more air discharge ports are formed on the side surface portion or the bottom surface portion. A cylindrical radiating fin that releases heat of the power conversion element to the outside, a partition plate that separates the inside of the radiating fin into the air inlet side and the air outlet side, and the air outlet of the radiating fin. It is attached to the provided end, and is attached to the end of the discharge side cooling fan that takes in outside air and guides it into the heat radiating fin, and the air introduction port of the radiating fin, An introduction side cooling fan for discharging the air in the heat radiating fin to the outside is provided.

  According to said structure, while releasing inside air to the exterior from the middle of a radiation fin, new external air is introduced from the middle of a radiation fin, the temperature difference of the air which flows through the inside of a radiation fin is made small, and one Even when a plurality of power conversion elements are attached to the radiating fins, each power conversion element can be efficiently cooled to increase the energization allowable amount of each power conversion element.

  The power conversion element cooling device for cooling a plurality of power conversion elements according to claim 4, wherein one or more air introduction ports and one or more air discharge ports are formed in a side surface portion or a bottom surface portion, and each of the power conversion devices A cylindrical radiating fin that releases the heat of the element to the outside, a partition plate that separates the inside of the radiating fin into the air inlet side and the air outlet side, and the radiating fin attached to the air outlet A discharge-side cooling fan that discharges the air in the outside, and an introduction-side cooling fan that is attached to the end of the radiation fin where the air introduction port is provided, and that exhausts the air in the radiation fin to the outside It is characterized by having.

  According to said structure, while releasing inside air to the exterior from the middle of a radiation fin, new external air is introduced from the middle of a radiation fin, the temperature difference of the air which flows through the inside of a radiation fin is made small, and one Even when a plurality of power conversion elements are attached to the radiating fins, each power conversion element can be efficiently cooled to increase the energization allowable amount of each power conversion element.

  Further, in claim 5, in the power conversion element cooling device according to claim 1, an introduction side cooling fan is provided in an air introduction port portion of the radiation fin, and outside air is taken in by the introduction side cooling fan, It guide | induces in the said radiation fin.

  According to the above configuration, when the outside air is forcibly introduced from the middle of the radiating fin, the temperature difference of the air flowing through the radiating fin is reduced, and a plurality of power conversion elements are attached to one radiating fin. However, each power conversion element can be efficiently cooled, and the energization allowable amount of each power conversion element can be increased.

  According to claim 6, in the power conversion element cooling device according to claim 5, a temperature detection element is provided in the heat dissipation fin, and a fan controller controls the side surface of the heat dissipation fin based on the detection result of the temperature detection element. Alternatively, the operation of the introduction side cooling fan provided on the bottom surface and the operation of the discharge side cooling fan provided on the other end of the radiating fin are controlled.

  According to the above configuration, when the temperature of the radiating fin exceeds a preset temperature, the outside air is forcibly introduced from the middle of the radiating fin without increasing the air pressure inside the radiating fan. The temperature difference of the air flowing inside is reduced, and even when multiple power conversion elements are attached to one radiating fin, each power conversion element is cooled efficiently, and the energization allowance of each power conversion element is increased. Can be made.

  According to claim 7, in the power conversion element cooling device according to claim 5, when the load state of the power conversion element becomes a preset load state, the fan controller controls the side surface of the radiation fin. Alternatively, the operation of the introduction side cooling fan provided on the bottom surface and the operation of the discharge side cooling fan provided on the other end of the radiating fin are controlled.

  According to the above configuration, when the load state of the power conversion element becomes a preset load state, the outside air is forcibly introduced from the middle of the radiating fin without increasing the pressure inside the radiating fan. Even when a plurality of power conversion elements are attached to one radiating fin by reducing the temperature difference of the air flowing inside the radiating fin, each power conversion element can be cooled efficiently and The capacity can be increased.

  According to the present invention, it is possible to reduce the temperature difference of the air flowing inside the radiating fins and efficiently cool each power conversion element even when a plurality of power conversion elements are attached to one radiating fin. The allowable energization amount of the conversion element can be increased.

<< First Embodiment >>
FIG. 1 is a side view showing a first embodiment of a power conversion element cooling device according to the present invention.

  The power conversion element cooling device 1a shown in this figure is composed of a cylindrical member such as aluminum having good thermal conductivity, and as shown in FIG. 2, a plurality of air inlets 2 and 3 are formed on the lower side. In a state where a silicon agent or the like is interposed, the heat dissipating fins 6 to which the plurality of power conversion elements 4 and 5 are attached on the upper side, and as shown in the front view of FIG. The outside air is taken in and led into the heat radiating fins 6 and attached to the cooling fan 7 that assists the heat radiating of the heat radiating fins 6 and the rear end side of the heat radiating fins 6. A cooling fan 8 that assists heat dissipation of the fin 6 is provided.

  Then, when driving of the main motor or the like is started by the inverter device and the temperature of each power conversion element 4, 5 is increased, each cooling fan 7, 8 is activated and the outside → the front end side of the radiating fin 6 → In the heat radiation fin 6 → the rear end side of the heat radiation fin 6 → the external path, air is caused to flow in the heat radiation fin 6 to release the heat generated by the power conversion elements 4 and 5 to the outside. The temperature of the elements 4 and 5 is prevented from exceeding a preset temperature.

  Further, a negative pressure is generated in the radiating fin 6 by the cooling fan 8 on the rear side, and the outside → the air inlets 2, 3 → the inside of the radiating fin 6 → the rear end side of the radiating fin 6 → the outside path, Cold air is also flowed into the rear side of the heat radiating fin 6 to dissipate the heat generated by the power conversion element 5 disposed on the rear side of the heat radiating fin 6. The temperature of the power conversion element 5 thus set is prevented from exceeding a preset temperature.

  As described above, in the first embodiment, a plurality of air introduction ports 2 and 3 are formed on the lower side of the radiating fin 6, and the heat radiated when the cooling fan 8 attached to the rear side of the radiating fin 6 is operated. Due to the negative pressure in the fin 6, cold air is introduced into the radiating fins 6 from the air inlets 2 and 3, and the power conversion elements 5 arranged on the rear side of the radiating fins 6 are forcibly cooled. Therefore, when outside air is introduced from the middle of the radiating fin 6 to reduce the temperature difference of the air flowing through the radiating fin 6, a plurality of power conversion elements 4 and 5 are attached to one radiating fin 6. However, each power conversion element 4 and 5 can be efficiently cooled, and the energization allowable amount of each power conversion element 4 and 5 can be increased.

<< Second Embodiment >>
4 is a side view showing a second embodiment of the power conversion element cooling apparatus according to the present invention, FIG. 5 is a bottom view of the power conversion element cooling apparatus shown in FIG. 4, and FIG. 6 is a power conversion element cooling apparatus shown in FIG. FIG. In these drawings, the same reference numerals are given to the portions corresponding to the respective portions in FIG. 1, FIG. 2, and FIG.

  The power conversion element cooling device 1b shown in each figure is different from the power conversion element cooling device 1a shown in FIGS. 1, 2, and 3 in that the air introduction ports 2 and 3 formed on the lower side of the radiation fin 6 The air introduction plates 11 and 12 are respectively attached to the air introduction plates 11 and 12, and the pressure loss when the externally cooled air is introduced into the radiating fins 6 through the air introduction ports 2 and 3 by the air introduction plates 11 and 12. This is to reduce the amount of air introduced into the radiating fin 6.

  As described above, in the second embodiment, the wind introduction plates 11 and 12 are respectively attached to the air introduction ports 2 and 3 formed on the lower side of the radiating fin 6, and the wind introduction plates 11 and 12 respectively The pressure loss when externally cooled air is introduced into the radiating fin 6 through the air introduction ports 2 and 3 is reduced, and the amount of air introduced into the radiating fin 6 is further increased. Therefore, a large amount of outside air is introduced from the middle of the radiating fin 6 to further reduce the temperature difference of the air flowing through the radiating fin 6, and a plurality of power conversion elements 4 and 5 are attached to one radiating fin 6. Even when the power conversion elements 4 and 5 are present, the power conversion elements 4 and 5 can be efficiently cooled to increase the energization allowance of the power conversion elements 4 and 5.

<< Third Embodiment >>
FIG. 7 is a side view showing a third embodiment of the power conversion element cooling apparatus according to the present invention, and FIG. 8 is a front view of the power conversion element cooling apparatus shown in FIG. In each figure, the same reference numerals are given to portions corresponding to the respective portions in FIGS.

  The power conversion element cooling device 1c shown in each figure is different from the power conversion element cooling device 1a shown in FIGS. 1 and 3 in that a partition plate 21 is provided in the central portion of the radiating fin 6 and the inside of the radiating fin 6 is in front. It is divided into a part side and a rear part side, and further, an air discharge port 22 is provided in a slightly rear upper part of the power conversion element 4 on the front part side.

  Then, the cooling fan 7 allows outside cold air to be taken into the front portion of the radiating fin 6 to efficiently cool the power conversion element 4 disposed on the front side of the radiating fin 6. The warmed air is discharged from the air discharge port 22 to the outside. The cooling fan 8 discharges the air warmed by the power conversion elements 5 disposed on the rear side of the heat radiating fins 6 and generates a negative pressure on the rear side of the heat radiating fins 6. The cold air is taken in from 3, and the power conversion element 5 is efficiently cooled.

  Thus, in 3rd Embodiment, the partition plate 21 is provided in the center part in the radiation fin 6, the inside of the radiation fin 6 is divided into the front part side and the rear part side, and it arrange | positions in the front side of the radiation fin 6. FIG. The air heated by the power conversion element 4 is prevented from flowing into the rear side of the radiating fin 6, and the cooling fan 7 introduces cooled air to the front side of the radiating fin 6, The power conversion element 4 arranged on the cooling fins 6 is efficiently cooled, and cooled air is introduced from the air inlet 3 by the cooling fan 8 so that the power conversion elements 5 arranged on the rear side of the heat radiation fins 6 are efficiently obtained. Since it is made to cool, while releasing inside air to the exterior from the middle of the radiation fin 6, new outside air is introduced from the middle of the radiation fin 6, and the temperature difference of the air flowing inside the radiation fin 6 is increased. Even when a plurality of power conversion elements 4, 5 are attached to one radiating fin 6, each power conversion element 4, 5 can be efficiently cooled to allow the energization allowable amount of each power conversion element 4, 5. Can be increased.

<< Fourth Embodiment >>
FIG. 9 is a side view showing a fourth embodiment of the power conversion element cooling apparatus according to the present invention, and FIG. 10 is a front view of the power conversion element cooling apparatus shown in FIG. In each figure, the same reference numerals are given to the parts corresponding to the respective parts in FIGS.

  The power conversion element cooling device 1d shown in each figure is different from the power conversion element cooling device 1c shown in FIGS. 7 and 8 in that the cooling fan 7 is removed from the front end portion of the radiation fin 6 and the front end portion is opened. That is, the cooling fan 31 is provided in the air discharge port 22 formed slightly on the rear upper side of the power conversion element 4 arranged on the front side of the heat radiation fin 6.

  Then, the cooling fan 31 causes the air warmed by the power conversion element 4 disposed on the front side of the heat radiating fins 6 to be discharged to the outside, and a negative pressure is generated on the front side of the heat radiating fins 6. The cold air is taken in from the front end portion of the power to cool the power conversion element 4 efficiently. The cooling fan 8 discharges the air warmed by the power conversion elements 5 disposed on the rear side of the heat radiating fins 6 and generates a negative pressure on the rear side of the heat radiating fins 6. The cold air is taken in from 3, and the power conversion element 5 is efficiently cooled.

  Thus, in 4th Embodiment, the partition plate 21 is provided in the center part in the radiation fin 6, the inside of the radiation fin 6 is divided into the front part side and the rear part side, and it arrange | positions in the front side of the radiation fin 6. FIG. The air heated by the power conversion element 4 is prevented from flowing into the rear side of the radiating fin 6, and cooled air is introduced from the front end portion of the radiating fin 6 and the air inlet 3, respectively. Since the power conversion element 4 arranged on the front side of the power conversion element 5 and the power conversion element 5 arranged on the rear side of the heat radiation fin 6 are efficiently cooled, the air inside the heat radiation fin 6 is brought outside from the middle. In addition to discharging, new outside air is introduced from the middle of the radiating fin 6 to reduce the temperature difference of the air flowing inside the radiating fin 6, and a plurality of power conversion elements 4, 5 are attached to one radiating fin 6. Have In air, each power conversion elements 4 and 5 by efficiently cooled, it is possible to increase the current capacity of each power conversion elements 4 and 5.

<< Fifth Embodiment >>
11 is a side view showing a fifth embodiment of the power conversion element cooling apparatus according to the present invention, FIG. 12 is a bottom view of the power conversion element cooling apparatus shown in FIG. 11, and FIG. 13 is a power conversion element cooling apparatus shown in FIG. FIG. In each figure, the same reference numerals are given to the parts corresponding to the respective parts in FIGS. 1, 2, and 3.

  The power conversion element cooling device 1e shown in each figure is different from the power conversion element cooling device 1a shown in FIGS. 1, 2, and 3 in that the air introduction ports 2 and 3 formed on the lower side of the radiation fin 6 The cooling fans 41 and 42 are respectively attached to the cooling fins 41 and 42, and the cooling fans 41 and 42 forcibly introduce the externally cooled air into the radiating fins 6 to reduce the air temperature in the radiating fins 6. That is, the power conversion element 4 arranged on the front side of the fin 6 and the power conversion element 5 arranged on the rear side of the heat radiation fin 6 are efficiently cooled.

  As described above, in the fifth embodiment, the cooling fans 41 and 42 are respectively attached to the air inlets 2 and 3 formed on the lower side of the radiating fin 6, and the cooling fans 41 and 42 are used to externally connect the cooling fans 41 and 42. Since the cooled air is forcibly introduced into the radiating fin 6 and the air temperature in the radiating fin 6 is lowered, the outside air is forcibly introduced from the middle of the radiating fin 6 to 6 Even when a plurality of power conversion elements 4 and 5 are attached to one radiating fin 6 by reducing the temperature difference of the air flowing inside, each power conversion element 4 and 5 is efficiently cooled to The energization allowable amount of the conversion elements 4 and 5 can be increased.

<< Sixth Embodiment >>
14 is a side view showing a sixth embodiment of the power conversion element cooling apparatus according to the present invention, FIG. 15 is a bottom view of the power conversion element cooling apparatus shown in FIG. 14, and FIG. 16 is a power conversion element cooling apparatus shown in FIG. FIG. In each figure, the same reference numerals are given to the parts corresponding to the respective parts in FIGS. 1, 2, and 3.

  The power conversion element cooling device 1 f shown in each figure is different from the power conversion element cooling device 1 a shown in FIGS. 1, 2, and 3 in that the air introduction ports 2 and 3 formed on the lower side of the radiating fin 6 are provided. Are provided with cooling fans 51 and 52, respectively, and a temperature detection element 53 is attached near the power conversion element 5 arranged on the rear side of the radiating fin 6, and each cooling is performed according to the detection result of the temperature detection element 53. A plurality of fan controllers 54, 55, 56 for controlling the operations of the fans 51, 52, 8 are provided.

  Then, as shown in the flowchart of FIG. 17, the threshold of the temperature of the power conversion element 5 is set in advance in a state where the power conversion elements 4 and 5 are operated and the cooling fans 7 and 8 are activated. When the value is higher than the value (step S1), the respective fan controllers 54 and 55 activate the respective cooling fans 51 and 52 provided on the bottom surface of the radiating fin 6 so that the externally cooled air is transferred to the radiating fin 6. The power conversion elements 4 and 5 are efficiently cooled (step S2), and the fan controller 56 increases the output of the cooling fan 8 to force the air inside the radiating fins 6 to the outside. So that the static pressure in the radiating fin 6 does not increase (step S3).

  Thereafter, when the temperature of the power conversion element 5 becomes lower than a preset threshold value (step S4), each cooling fan 51 provided on the bottom surface of the radiation fin 6 by each fan controller 54, 55. , 52 are stopped (step S5), and the fan controller 56 returns the output of the cooling fan 8 to the original value (step S6).

  Thus, in 6th Embodiment, when the temperature of the power conversion element 5 became higher than the preset threshold value, it was provided in the bottom face of the radiation fin 6 by each fan controller 54,55. Each of the cooling fans 51 and 52 is started to introduce the externally cooled air into the radiating fin 6 to efficiently cool the power conversion elements 4 and 5, and the fan controller 56 outputs the output of the cooling fan 8. , The air in the radiating fin 6 is forcibly discharged to the outside so that the static pressure in the radiating fin 6 does not increase, so that the temperature of the power conversion element 5 rises and the radiating fin is increased. When the temperature of 6 exceeds a preset temperature, outside air is forcibly introduced from the middle of the radiating fin 6 without increasing the air pressure inside the radiating fan 6, Temperature difference Even when a plurality of power conversion elements 4 and 5 are attached to one radiating fin 6, the power conversion elements 4 and 5 can be efficiently cooled, and the energization allowable amount of each power conversion element 4 and 5 is reduced. Can be increased.

<< Seventh Embodiment >>
18 is a side view showing a seventh embodiment of the power conversion element cooling device according to the present invention, FIG. 19 is a bottom view of the power conversion element cooling device shown in FIG. 18, and FIG. 20 is a power conversion element cooling device shown in FIG. FIG. In each figure, the same reference numerals are given to portions corresponding to the respective portions in FIGS. 14, 15 and 16.

  The power conversion element cooling device 1g shown in each figure is different from the power conversion element cooling device 1f shown in FIGS. 14, 15, and 16 in that the temperature detection element 53 is removed from the heat radiating fins 6 and each fan controller 61, The load amount of the power conversion element 5 is detected by 62 and 63, and the cooling fans 51, 52, and 8 are controlled according to the detection result.

  At this time, as shown in the flowchart of FIG. 21, the output current of the power conversion element 5 per unit time in a state where the power conversion elements 4 and 5 are operated and the cooling fans 7 and 8 are activated. When the integral value becomes larger than a preset threshold value (step S11), each fan controller 61, 62 activates each cooling fan 51, 52 provided on the bottom surface of the radiation fin 6, Externally cooled air is introduced into the radiating fin 6 to efficiently cool the power conversion elements 4 and 5 (step S12), and the fan controller 63 increases the output of the cooling fan 8 to increase the radiating fin. The air in 6 is forcibly discharged to the outside so that the static pressure in the radiating fin 6 does not increase (step S13).

  After that, when the output current integrated value of the power conversion element 5 per unit time becomes smaller than a preset threshold value (step S14), the bottom surfaces of the radiation fins 6 are controlled by the fan controllers 61 and 62. Each of the cooling fans 51 and 52 provided in the above is stopped (step S15), and the output of the cooling fan 8 is returned to the original value by the fan controller 63 (step S16).

  Thus, in the seventh embodiment, when the output current integrated value of the power conversion element 5 per unit time becomes larger than the preset threshold value, the fan controllers 61 and 62 dissipate heat. The cooling fans 51 and 52 provided on the bottom surface of the fin 6 are activated to introduce externally cooled air into the heat radiating fin 6 to efficiently cool the power conversion elements 4 and 5 and a fan controller. 63, the output of the cooling fan 8 is increased to forcibly discharge the air in the heat radiating fin 6 to the outside so that the static pressure in the heat radiating fin 6 does not increase. When the load state becomes a preset load state, the outside air is forcibly introduced from the middle of the radiating fin 6 without increasing the air pressure inside the radiating fan 6 to flow inside the radiating fin 6. Even when a plurality of power conversion elements 4, 5 are attached to one radiating fin 6, the power conversion elements 4, 5 are efficiently cooled, and each power conversion element 4 5 can be increased.

  In the seventh embodiment, when the output current integrated value of the five power conversion elements per unit time becomes larger than a preset threshold value, each fan controller 61, 62 controls each cooling fan. 51 and 52 are activated to introduce externally cooled air into the radiating fin 6 and the fan controller 63 increases the output of the cooling fan 8 so that the static pressure in the radiating fin 6 does not increase. However, when the accumulated operating time value of the power conversion element 5 becomes larger than a preset threshold value, each fan controller 61, 62 activates each cooling fan 51, 52, External cold air is introduced into the radiating fin 6 to efficiently cool the power conversion elements 4 and 5, and the fan controller 63 increases the output of the cooling fan 8, Forcibly discharging air in the heat fins 6 to the outside, the static pressure in the heat radiating fins 6 may be caused to avoid increasing.

  Even in this case, when the accumulated operating time value becomes larger than the preset threshold value and the temperature of the power conversion element 5 becomes equal to or higher than the preset temperature, the air pressure inside the heat dissipation fan 6 is increased. Therefore, the outside air is forcibly introduced from the middle of the radiating fin 6 to reduce the temperature difference of the air flowing through the radiating fin 6, and a plurality of power conversion elements 4 and 5 are attached to one radiating fin 6. Even when the power conversion elements 4 and 5 are turned on, the power conversion elements 4 and 5 can be efficiently cooled, and the energization allowable amount of the power conversion elements 4 and 5 can be increased.

It is a side view which shows 1st Embodiment of the power conversion element cooling device by this invention. It is a bottom view of the power conversion element cooling device shown in FIG. It is a front view of the power conversion element cooling device shown in FIG. It is a side view which shows 2nd Embodiment of the power conversion element cooling device by this invention. It is a bottom view of the power conversion element cooling device shown in FIG. It is a front view of the power conversion element cooling device shown in FIG. It is a side view which shows 3rd Embodiment of the power conversion element cooling device by this invention. It is a front view of the power conversion element cooling device shown in FIG. It is a side view which shows 4th Embodiment of the power conversion element cooling device by this invention. It is a front view of the power conversion element cooling device shown in FIG. It is a side view which shows 5th Embodiment of the power conversion element cooling device by this invention. It is a bottom view of the power conversion element cooling device shown in FIG. It is a front view of the power conversion element cooling device shown in FIG. It is a side view which shows 6th Embodiment of the power conversion element cooling device by this invention. It is a bottom view of the power conversion element cooling device shown in FIG. It is a front view of the power conversion element cooling device shown in FIG. It is a flowchart which shows the operation example of the power conversion element cooling device shown in FIG. It is a side view which shows 7th Embodiment of the power conversion element cooling device by this invention. It is a bottom view of the power conversion element cooling device shown in FIG. It is a front view of the power conversion element cooling device shown in FIG. It is a flowchart which shows the operation example of the power conversion element cooling device shown in FIG. It is a side view which shows an example of the conventionally known power conversion element cooling device. It is a front view of the power conversion element cooling device shown in FIG.

Explanation of symbols

1a to 1g: Power conversion element cooling device 2, 3: Air introduction port 4, 5: Power conversion element 6: Radiation fin 7: Cooling fan 8: Cooling fan 11, 12: Air introduction plate 21: Partition plate 22: Air exhaust Outlet 31: Cooling fan 41, 42, 51, 52: Cooling fan 53: Temperature detection element 54, 55, 56, 61, 62, 63: Fan controller

Claims (7)

In the power conversion element cooling device for cooling a plurality of power conversion elements,
One or more air inlets are formed in the side surface portion or the bottom surface portion, and cylindrical radiating fins for releasing the heat of each power conversion element to the outside,
An introduction side cooling fan that is attached to one end side of the heat radiating fin, takes outside air, and guides it into the heat radiating fin;
A discharge-side cooling fan that is attached to the other end of the radiating fin and discharges the air in the radiating fin to the outside,
A power conversion element cooling device comprising: In the power conversion element cooling device according to claim 1,
A wind introduction plate is provided in the air introduction port portion of the radiating fin, and by this wind introduction plate, the pressure loss of air flowing through the air introduction port and flowing into the radiating fin is reduced.
The power conversion element cooling device characterized by the above-mentioned. In the power conversion element cooling device for cooling a plurality of power conversion elements,
One or more air inlets and one or more air outlets are formed in the side surface part or the bottom surface part, and cylindrical radiating fins for releasing the heat of each power conversion element to the outside,
A partition plate that separates the inside of the radiating fin into the air inlet side and the air outlet side;
A discharge-side cooling fan that is attached to the end of the radiating fin where the air discharge port is provided, takes outside air, and guides it into the radiating fin;
An introduction side cooling fan that is attached to the end of the heat radiating fin where the air inlet is provided and discharges the air inside the radiating fin to the outside,
A power conversion element cooling device comprising: In the power conversion element cooling device for cooling a plurality of power conversion elements,
One or more air inlets and one or more air outlets are formed in the side surface part or the bottom surface part, and cylindrical radiating fins for releasing the heat of each power conversion element to the outside,
A partition plate that separates the inside of the radiating fin into the air inlet side and the air outlet side;
A discharge-side cooling fan attached to the air discharge port for discharging the air in the heat radiating fin to the outside;
An introduction side cooling fan that is attached to the end of the heat radiating fin where the air inlet is provided and discharges the air inside the radiating fin to the outside,
A power conversion element cooling device comprising: In the power conversion element cooling device according to claim 1,
An introduction-side cooling fan is provided in the air introduction port portion of the radiation fin, and outside air is taken in by the introduction-side cooling fan and guided into the radiation fin.
The power conversion element cooling device characterized by the above-mentioned. In the power conversion element cooling device according to claim 5,
A temperature detection element is provided in the heat radiation fin, and the operation of the introduction side cooling fan provided on the side surface or the bottom surface of the heat radiation fin by the fan controller based on the detection result of the temperature detection element, the other end of the heat radiation fin To control the operation of the discharge side cooling fan provided in the
The power conversion element cooling device characterized by the above-mentioned. In the power conversion element cooling device according to claim 5,
When the load state of the power conversion element becomes a preset load state, the fan controller provides the operation of the introduction side cooling fan provided on the side surface or the bottom surface of the radiating fin, the other end of the radiating fin. To control the operation of the discharge side cooling fan provided in the
The power conversion element cooling device characterized by the above-mentioned.

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