JP2007059639A - Cooling structure of power converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively cool a power element mounted on each unit by effectively cooling the individual units stored densely in a board. <P>SOLUTION: The plurality of units 2 are arranged vertically with some space in a board via unit supporting frames. In the front face of the board, an inflow hole is formed for cooling wind. In a rear part inside the board, a wind channel 4 is formed. A ventilation fan is formed in an outflow hole formed in communication with the wind channel in an upper part of the board. A heat sink 2b with the power element 2a mounted thereon is arranged in each unit 2 except for a front. Each unit 2 can ventilate the air through the front, while ventilating the air to the wind channel 4 via the heat sink 2b. Each unit 2 can ventilate the air also via the top face. In the bottom face of each unit 2, first ventilation holes 2c and 2d are formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooling structure for a power converter.

  In a power converter, for example, a high-voltage inverter device, a plurality of single-phase inverter units (hereinafter abbreviated as units) are combined in accordance with the capacity. Therefore, in the converter panel of the high-voltage inverter device, it is necessary to effectively cool a plurality of units housed in the panel. In such a case, generally, by installing a wind tunnel in the panel, the heat sink part in which the power element of each unit is mounted is cooled in a batch, but heat is retained in parts other than the heat sink part of each unit. In particular, cooling of mounted electrical components has become a problem.

  4 (a) and 4 (b) show a schematic longitudinal side view and a schematic longitudinal front view of a converter panel of a conventional high-voltage inverter device. In the converter panel 1, 6 or 18 or Multiple units (18 in the case of FIG. 4) of these units 2 are mounted and accommodated in two rows at intervals in the vertical direction via the unit support frame 3. In addition, a cooling air inflow hole 1 a is provided in the front surface of the converter panel 1, a wind tunnel 4 is provided in the rear part of the converter panel 1, and the wind tunnel 4 is communicated with the upper part of the converter panel 1. The cooling air outflow hole 1b is provided, and the ventilation fan 5 is provided in the outflow hole 1b. Each unit 2 includes a heat sink portion 2b on which a power element (semiconductor switching element) 2a is mounted. Each unit 2 can be ventilated from the front, and the heat sink portion 2 b can be ventilated forward and backward, and the rear is connected to the wind tunnel 4.

  In the above configuration, when the ventilation fan 5 is driven, the cooling air flows into the converter panel 1 from the inflow hole 1a on the front surface of the converter panel 1, flows into each unit 2 from the front surface, and the heat sink portion 2b is moved forward. Then, it flows into the wind tunnel 4 and flows out of the converter panel 1 through the outflow hole 1a, whereby each heat sink portion 2b is cooled, and each unit 2 is cooled.

As prior art documents related to the invention of this application, there are the following.
Japanese Utility Model Publication No. 5-55589 Japanese Patent No. 3396398 JP 2000-151161 A JP 2002-111264 A JP 200487711 A

  By the way, the converter panel 1 is required to be miniaturized, so that each unit 2 is housed as densely as possible. However, the atmosphere between the densely stored units 2 is in a state where the convection is blocked by the bottom surface of the casing of the converter panel 1 and the shelf 3a of the unit support frame 3 that supports the unit 2. As a result, the ambient temperature was raised, which could cause problems in the performance of the unit 2. Therefore, in order to promote convection in the air between the units 2 tightly housed in the converter panel 1, a fan other than the ventilation fan 5 for ventilating the wind tunnel 4 in the converter panel 1 or the unit 2 may be provided. Although thought, it led to a decrease in reliability as the number of fans increased. Also, a place other than the heat sink portion 2b connected to the heat sink portion 2b of each unit 2 and connected to the heat sink portion 2b so that the air between the units 2 is sucked into the wind tunnel 4 for cooling the heat sink portion 2b of each unit 2. However, in this case, it is necessary to increase the capacity of the fan installed in the wind tunnel 4.

  The present invention has been made to solve the above-described problems, and does not increase the number of cooling fans and without reducing the cooling capacity of the heat sink portion of the single-phase inverter unit. It is an object of the present invention to obtain a cooling structure for a power conversion device that can effectively cool each unit housed tightly and can effectively cool a power element mounted on each unit.

  In the cooling structure for a power converter according to claim 1 of the present invention, a plurality of single-phase inverter units are provided in the panel via a unit support frame at intervals in the vertical direction, and a cooling air inflow hole is formed in the front of the panel. In addition, a wind tunnel is provided in the rear part of the panel, and a ventilation fan is provided in the cooling air outlet hole provided in the upper part of the panel and communicating with the wind tunnel. In the power converter that is provided with a heat sink portion on which the power element is mounted and can be ventilated from the front and ventilated through the heat sink portion, the upper surface of each single-phase inverter unit is formed to be ventilated. The first vent holes are provided on the bottom surface of each single-phase inverter unit.

  In the cooling structure for a power converter according to claim 2 of the present invention, a plurality of single-phase inverter units are provided in the panel via a unit support frame at intervals in the vertical direction, and a cooling air inflow hole is formed in the front of the panel. In addition, a wind tunnel is provided in the rear part of the panel, and a ventilation fan is provided in the cooling air outlet hole provided in the upper part of the panel and communicating with the wind tunnel. In the power converter that is provided with a heat sink portion on which the power element is mounted and that can be ventilated from the front and can be ventilated to the wind tunnel through the heat sink portion, the upper surface of each single-phase inverter unit is formed so as not to be ventilated. The second ventilation hole is provided on the upper surface.

  The cooling structure of the power converter according to claim 3 shields the intake air from the front of the heat sink part.

  In the cooling structure of the power conversion device according to claim 4, a plurality of single-phase inverter units are provided in the panel via a unit support frame at intervals in the vertical direction, and a cooling air inflow hole is provided in the front of the panel. In addition, a wind tunnel is provided in the rear part of the panel, and a ventilation fan is provided in the outflow hole of the cooling air provided in the upper part of the panel and communicated with the wind tunnel, and each single-phase inverter unit is a power element except for the front part. In the power conversion device that is provided with a heat sink portion on which is mounted and that can be ventilated from the front and can be ventilated to the wind tunnel through the heat sink portion, the upper surface of each single-phase inverter unit is formed to be ventilated and the single-phase A gap is provided between the inverter unit and the shelf plate portion of the unit support frame that supports the single-phase inverter unit, and a third vent is provided at the rear of the shelf plate portion. The free front bottom of the heat sink portion of the single-phase inverter unit is provided with a fourth vent.

  As described above, according to the first aspect of the present invention, the upper surface of each unit is formed so as to be ventilated, and the first vent hole is provided on the bottom surface of each unit. It flows out from the upper surface of the unit, passes between the units, and flows in from the first vent hole on the bottom surface of the upper unit. For this reason, the cooling air flow to the heat sink is cooled in the same manner as before, the air between the units is cooled, and convection is generated in the air of the lower unit, reducing the ambient temperature of the power element. The cooling effect of the power element is improved.

  According to the second aspect, the cooling air is allowed to flow not only in the heat sink part but also between the units and the power element, and the power element can be directly or indirectly cooled to improve the cooling effect.

  According to the third aspect, by blocking the intake air from the front of the heat sink portion, convection is caused in the air between the units 2 and the cooling effect is improved.

  According to claim 4, the cooling air passes through the gap between the unit and the shelf board from the third ventilation hole 3b of the shelf board, passes through the fourth ventilation hole on the front bottom surface of the unit, and cools the power element. Then flows out from the top of the unit. Thus, the cooling effect is improved by causing convection in the unit 2.

Best Embodiment 1
The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a partially enlarged schematic side view of a converter panel of a high-voltage inverter device according to Embodiment 1 of the present invention. Unit 2 is formed so that the front can be ventilated and the upper surface can be vented. The first vent holes 2c and 2d are provided on the bottom surface of 2 at the front portion without the heat sink portion 2b and / or the rear portion with the heat sink portion 2b. Other configurations are the same as those of the prior art.

  In the above-described configuration, the cooling air flows from the inflow hole 1a as in the prior art by driving the ventilation fan 5, flows into each unit 2 from the front, flows through the heat sink portion 2b, enters the wind tunnel 4, and flows out from the outflow hole 1b. To do. Further, a part of the cooling air flowing in from the front surface of the lower unit 2 and the first ventilation hole 2 c flows out from the upper surface of the lower unit 2, passes between the units 2, and passes through the first unit 2 to the upper unit 2. From the air vents 2c and 2d.

  In the first embodiment, the heat sink portion 2b of the unit 2 is cooled as in the prior art, the air between the units 2 is also cooled, and the convection can be generated in the atmosphere of the power element 2a of the unit 2. The ambient temperature of the element 2a can be lowered, and the cooling effect of each power element 2a can be improved. However, if a large amount of cooling air is introduced from the rear vent 2d at the bottom of the unit 2, the cooling air flowing through the heat sink portion 2b from the front to the rear is reduced, and the cooling effect of the heat sink portion 2b is reduced. The cooling air taken in from the pores 2d should not be so large. Further, since there is no need to provide an additional member such as a cooling fan, reliability is not lowered.

Embodiment 2
FIG. 2 is a partially enlarged side view of the longitudinal section of the converter panel of the high-voltage inverter device according to the second embodiment. The unit 2 can be ventilated at the front, and the top and bottom surfaces of the unit 2 cannot be vented. A second ventilation hole 2 e is formed on the upper surface of 2. Other configurations are the same as those of the prior art.

  In the above configuration, the cooling air flows through the heat sink portion 2b as in the conventional case. On the other hand, the cooling air flows into the lower unit 2 from the space between the units 2 through the second ventilation hole 2e, and the power element. After cooling 2a, the heat sink portion 2b flows from the front to the rear.

  In the second embodiment, the cooling air passes through the heat sink portion 2b after cooling the power element 2a through the second ventilation hole 2e provided on the upper surface of the lower unit 2 from between the units 2. 2a can be directly or indirectly cooled, and the cooling effect of the power element 2a can be improved. Further, since there is no need to provide an additional member such as a cooling fan, reliability is not lowered. Furthermore, the cooling effect of the heat sink part 2b is not reduced.

Embodiment 3
In the third embodiment, in addition to the first or second embodiment, the intake air from the front of the heat sink portion 2b is shielded. In the first embodiment, the cooling air that should flow from the front of the heat sink portion 2b flows between the upper surface of the unit 2 and the unit 2, and further flows to the first vent holes 2c and 2d of the upper unit 2, Convection is caused in the air between the two to improve the cooling effect. In the second embodiment, the cooling air that should flow from the front of the heat sink portion 2b cools the power element 2a, flows out from the second ventilation hole 2e, and flows between the units 2. Thus, the cooling effect is improved by causing convection in the air between the units 2. Further, since there is no need to provide an additional member such as a cooling fan, reliability is not lowered.

Embodiment 4
FIG. 3 is a partially enlarged schematic side view of the converter panel of the converter board of the high-voltage inverter device according to the fourth embodiment. The unit 2 is formed so that the front can be ventilated and the upper surface can also be vented. In the case of a high-voltage inverter device, each unit 2 increases as its capacity increases. In this case, the shelf 3a of the unit support frame 3 that supports the unit 2 is required. However, the shelf 3a blocks intake air from the bottom surface of each unit 2. Therefore, the gap 6 is provided between the unit 2 and the shelf 3a that supports the unit 2, the third ventilation hole 3b is provided at the rear of the shelf 3a, and there is no heat sink 2b of each unit 2. A fourth ventilation hole 2f is provided on the bottom of the front part. Other configurations are the same as those of the prior art.

  In the above configuration, the cooling air that has flowed into the unit 2 from the front through the inflow hole 1a flows through the heat sink 2b to cool the power element 2a, and the second plate 2 of the shelf 2a of the unit 2 below the inflow hole 1a. 3 flows through the gap between the unit 2 and the shelf 3a, cools the power element 2a through the fourth vent 2f on the front bottom surface of the unit 2, and further cools the unit 2 Passes between the units 2 from the upper surface of the upper wall 2 and passes through the third ventilation hole 3 b of the shelf 3 a of the upper unit 2. In this way, by causing convection in the unit 2, the power element 2a is effectively cooled. Further, since there is no need to provide an additional member such as a cooling fan, reliability is not lowered. Furthermore, the cooling effect of the heat sink part 2b is not reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged schematic side view of a converter panel of a high-voltage inverter device according to Embodiment 1 of the present invention. FIG. 4 is a partially enlarged schematic side view of a converter panel of a high-voltage inverter device according to a second embodiment. FIG. 3 is a partially enlarged view of a schematic longitudinal side surface of the converter panel of the high-voltage inverter device according to the first embodiment. It is the general | schematic longitudinal side view and schematic longitudinal front view of the converter panel of the conventional high voltage inverter apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Converter board 1a ... Inflow hole 1b ... Outflow hole 2 ... Single phase inverter unit 2a ... Power element 2b ... Heat sink part 2c, 2d ... 1st ventilation hole 2e ... 2nd ventilation hole 2f ... 4th ventilation hole DESCRIPTION OF SYMBOLS 3 ... Unit support frame 3a ... Shelf board part 3b ... 3rd ventilation hole 4 ... Wind tunnel 5 ... Ventilation fan 6 ... Gap

Claims (4)

  A plurality of single-phase inverter units are provided in the panel via a unit support frame at intervals in the vertical direction, a cooling air inflow hole is provided in the front of the panel, and a wind tunnel is provided in the rear part of the panel, and A ventilation fan is provided in the cooling air outlet hole provided in the upper part of the panel and communicated with the wind tunnel, and each single-phase inverter unit is provided with a heatsink part including a power element except for the front part, and from the front. In the power conversion device that can ventilate and can ventilate to the wind tunnel through the heat sink, the top surface of each single-phase inverter unit is formed to be ventilated, and the first vent hole is provided on the bottom surface of each single-phase inverter unit The cooling structure of the power converter characterized by the above-mentioned.   A plurality of single-phase inverter units are provided in the panel via a unit support frame at intervals in the vertical direction, a cooling air inflow hole is provided in the front of the panel, and a wind tunnel is provided in the rear part of the panel, and A ventilation fan is provided in the cooling air outlet hole provided in the upper part of the panel and communicated with the wind tunnel, and each single-phase inverter unit is provided with a heat sink part with power elements except for the front part, and from the front. In the power conversion device that can be ventilated and can be ventilated to the wind tunnel through the heat sink portion, the upper surface of each single-phase inverter unit is formed so as not to be ventilated, and the second vent hole is provided on the upper surface. The cooling structure of the power converter.   The cooling structure for a power conversion device according to claim 1 or 2, wherein intake air from the front of the heat sink portion is shielded.   A plurality of single-phase inverter units are provided in the panel via a unit support frame at intervals in the vertical direction, a cooling air inflow hole is provided in the front of the panel, and a wind tunnel is provided in the rear part of the panel, and A ventilation fan is provided in the cooling air outlet hole provided in the upper part of the panel and communicated with the wind tunnel, and each single-phase inverter unit is provided with a heat sink part with power elements except for the front part, and from the front. In the power conversion device that can ventilate and can ventilate to the wind tunnel through the heat sink, the upper surface of each single-phase inverter unit is formed to be ventilated, and the unit support frame that supports the single-phase inverter unit and the single-phase inverter unit And a third vent hole in the rear part of the shelf board part, and a heat sink part of the single-phase inverter unit Cooling structure of the power conversion apparatus characterized in that a fourth ventilation holes without the front bottom.

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