JP2002141689A - Inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a contaminated air from coming into a housing chamber in which a control unit is housed even if a part of a plurality of inverter units is taken out of a case. SOLUTION: When an inverter unit 2 is housed in a case 1 comprising a housing chamber 1a and a duct 1b, a pair of opening/closing doors 7 is pushed open while a resistor plate 9 protrudes into the duct 1b to raise an air resistance, resulting in closed pair of opening/closing doors 7 under the energizing force an energizing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device, and to prevent a problem from occurring even when some inverter units are removed and used for maintenance and inspection.

[0002]

2. Description of the Related Art Semiconductors are used in inverter devices (power conversion devices). If the control circuit built in the inverter unit constituting the inverter device is contaminated with the contaminated air, malfunctions are likely to occur. For this reason, in general, the inverter unit separates a cooling fin that emits heat generated from the semiconductor and a control unit other than the cooling fin and accommodates them in a housing. In order to facilitate maintenance and inspection of each inverter unit, the inverter unit is inserted from the front side of the inverter device and removably mounted.

FIG. 3 shows the structure of a conventional inverter device. The inverter device includes one or more inverter units 2 housed in a housing 1. The inverter unit 2 includes a control unit 2a having a control circuit and a semiconductor, and a cooling fin 2b. The interior of the housing 1 is divided into a single accommodation room 1 a by a partition plate 3 and a partition plate 4.
And three ducts 1b. The inverter unit 2 is accommodated in the accommodation room 1a, and only the cooling fin 2b projects through the through hole 3a formed in the partition plate 3 into the duct 1b.

The duct 1b is formed so that air circulates between the duct 1b and the atmosphere by penetrating the housing 1 up and down. The lower part of each duct 1b is used for forcibly circulating the air. A fan 5 is provided.

[0005]

However, when one of the inverter units 2 is taken out for maintenance and inspection, dirty air enters the accommodation room 1a through the through hole 3a. In addition, when the duct is not divided for each inverter unit 2, a large amount of air flows in a portion where the cooling fins 2b do not exist because the air resistance is small.
Since there is a possibility that the cooling air flowing through the portion where the cooling fins 2b exist is insufficient and overheating occurs, it is necessary to provide the partition plate 4 as shown in FIG. 3 and provide the fan 5 for each duct 1b. Cost increases.

Therefore, an object of the present invention is to provide an inverter device which solves the above problem.

[0007]

According to a first aspect of the present invention, there is provided an inverter apparatus comprising: a housing; a partition plate having a through hole; And a fan that forcibly circulates air into the duct by protruding a part of the cooling fan of the inverter unit housed in the housing room from the through hole into the duct. The inverter device according to claim 1, further comprising an opening / closing unit that opens the through-hole when the inverter unit is housed and closes the through-hole when the inverter unit is not housed. Opening and closing means
An opening / closing door that opens toward the duct is provided in the through hole, and an urging unit that urges the opening / closing door in a closing direction is provided. The inverter device according to claim 3, wherein In Claim 2, the said urging means was comprised by the lug formed in the said opening / closing door, and the said fan which blows to the said lug, The structure of the inverter apparatus which concerns on Claim 4 is characterized by the said urging | biasing The configuration of the inverter device according to claim 5, wherein a spring is provided as means, and when a part of the plurality of inverter units is taken out of the housing, the cooling fins of the inverter unit before being taken out are provided. And a resistance generating means for generating a resistance substantially equal to the resistance of the airflow due to the presence of the air flow.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an inverter device according to the present invention will be described below. In this embodiment, since a part of the conventional inverter device is improved, the same parts as those of the conventional inverter are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.

(A) Embodiment 1 As shown in FIG. 1, two of three inverter units are housed in a housing 1, and one of them is in a state of being taken out. As in the conventional case, a housing chamber 1a and a flow path 1b whose top and bottom are open are formed inside the housing 1, and the flow path 1
b is different from the conventional one and has no partition plate and is single. Further, since the flow path 1b is single, the fan 5 is also single.

As in the conventional case, the inverter unit 2 can be accommodated in the accommodation room 1a and the cooling fin 2b can be projected from the through hole 3a into the duct 1b. In the present invention, opening / closing doors 7 are provided on both sides of the through hole 3a in the duct 1b, respectively, as opening / closing means for closing the through hole 3a when the inverter unit 2 is taken out of the accommodation room 1a.

The structure of the door 7 will be described below. FIG.
As shown in a perspective view in FIG.
Is provided on the partition plate 3, and an opening / closing door 7 is provided rotatably via a shaft provided between a pair of bearing fittings 8. Further, an urging means for constantly urging the door 7 in the closing direction is provided. The urging means includes a lug 7 formed on the door 7.
a and a fan 5 that urges the lug 7a in a direction to close the door 7 by blowing the wind.

The removal of the inverter unit 2 eliminates the cooling fins 2b as obstacles to the air flow and reduces the air resistance. However, in order to recover the air resistance, a resistance generating means is provided.

As a resistance generating means, a resistance plate 9 is provided inside the cover 1c which is a part of the housing 1 and constitutes the duct 1b, as shown in FIG. 2 (b). The resistance plates 9 are arranged at positions inside the cover 1c and corresponding to the through holes 3a. That is, a pair of bearings 1
One end of the resistance plate 9 is rotatably provided via a shaft (not shown) 0 and an urging means for urging the other end of the resistance plate 9 toward the through hole 3a. The urging means is the same as described above, and is constituted by a lug 9 a formed at the other end of the resistance plate 9 and the fan 5. The width dimension A of the resistance plate 9 is set to be larger than the width dimension B between the two when the pair of doors 7 are open so as not to restrict the pair of doors 7 from closing. The resistor plate 9 has a window 9b for reducing wind resistance caused by the resistor plate 9.

Next, the operation of the inverter device will be described. First, when all the inverter units 2 are housed in the housing 1, the opening / closing door 7 is pushed open by the cooling fins 2b in FIG. The other end is pushed by the cooling fin 2b, and the air flowing in the duct 1b is not affected by the resistance plate 9. Therefore, when the single fan 5 is rotated, air flows in the duct 1b, and the three cooling fins 2b are cooled evenly.

Next, when the lowermost inverter unit 2 in FIG. 1A is taken out of the housing 1 for maintenance and inspection, for example, the wind of the fan 5 coming from the direction indicated by the arrow in FIG. Hits the lug 7a to generate a lift, thereby closing the pair of doors 7 and closing the through hole 3a. Therefore, the dirty air is prevented from entering the interior of the accommodation room 1a. When the support by the cooling fins 2b is lost, the wind of the fan 5 flowing in the direction of the arrow in FIG. 2B hits the lug 9a to generate a lift, and the other end of the resistance plate 9 rotates to close the pair. Abuts on the opening / closing door 7. For this reason, the position where the cooling fins 2b exist is occupied by the resistance plate 9 instead of the cooling fins, and the same air resistance as in the case where the cooling fins 2b exist is generated.
Regarding the remaining cooling fins 2b, the cooling efficiency does not fluctuate before and after the inverter unit 2 is taken out.

As described above, when the inverter unit 2 is removed, the through-hole 3a of the removed portion is closed and the same air resistance as when the cooling fin is present is generated. The same applies to the case of taking out from the body 1.

(B) Second Embodiment Next, a second embodiment will be described.

In this embodiment, a spring is used instead of the wind pressure of the fan 5 as the urging means for urging the opening / closing door 7 in the closing direction in the first embodiment.

Also, in order to urge the resistance plate 9 toward the inside of the duct 1b, a spring is used here instead of using the wind pressure of the fan 5.

The operation of such an inverter device will be described.
Due to the presence of the spring, an urging force is constantly applied to the door 7 in the direction in which the door 7 closes. Therefore, when the inverter unit 2 is taken out of the housing 1, the pair of doors 7 is closed by the urging force of the spring, and the through hole 3a is closed.

Further, due to the presence of a spring (not shown), a biasing force for rotating the other end of the resistance plate 9 to the accommodation chamber 1a always acts on the resistance plate 9. For this reason, when the inverter unit 2 is taken out of the housing 1, the other end of the resistance plate 9 is connected to the duct 1b.
To block a part of the duct 1b. Therefore, the state is the same as the case where three cooling fins 2b are present, and the state of the air flowing to the cooling fins 2b is constant regardless of the number of accommodated inverter units 2, and the cooling efficiency of the cooling fins 2b does not change. .

The opening / closing door may be provided only on one side, not on both sides of the through hole.

[0023]

As can be seen from the above description, claim 1
According to the inverter devices according to the first to fifth aspects, when the inverter unit is removed from the housing, the opening / closing door closes and the through hole is closed, so that there is no possibility that dirty air enters the accommodation room in which the control unit is accommodated. Further, the space in the duct where the cooling fins are eliminated is occupied by the resistance plate, and the same air resistance as in the case where the cooling fins exist is generated. For this reason, even if some inverter units are taken out, the cooling fins of the remaining inverter units can be cooled evenly, cooling with a single duct and a single fan is possible, and the structure is simple. Cost is low, and maintenance and inspection work is reduced.

[Brief description of the drawings]

FIG. 1 is a plan view, FIG. 1B is a front view, and FIG. 1C is a right side view according to a first embodiment of an inverter device according to the present invention.

2A is a perspective view of an opening / closing door, and FIG. 2B is a perspective view of a resistance plate.

3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a right side view of the conventional inverter device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 1a ... Storage room 1b ... Duct 2 ... Inverter unit 2b ... Cooling fins 3 ... Partition plate 3a ... Through-hole 5 ... Fan 7 ... Opening / closing door 9 ... Resistance plate 9b ... Window

Claims (5)

[Claims] 1. A housing having a housing and a duct open to the atmosphere by providing a partition plate having a through hole inside a housing, and a cooling fan portion of an inverter unit housed in the housing is formed. In an inverter device provided with a fan protruding from the through hole into the duct and forcibly circulating air into the duct, the through hole is opened when the inverter unit is housed, and closed when the inverter unit is not housed. An inverter device provided with opening / closing means. 2. The device according to claim 1, wherein the opening / closing means is provided with an opening / closing door which opens toward the duct, and an urging means for urging the opening / closing door in a closing direction. Inverter device. 3. The inverter device according to claim 2, wherein the urging means includes a lug formed on the opening / closing door and the fan that blows air to the lug. 4. The inverter device according to claim 2, wherein a spring is provided as said urging means. 5. A resistance generating means for generating, when a part of a plurality of inverter units is taken out of a housing, a resistance substantially equal to a resistance of an air flow due to the presence of a cooling fin of the inverter unit before taking out. The inverter device according to claim 3 or 4, further comprising: