JPH11112159A - Housing structure of power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts so as to materialize the downsizing at large, by forming a box without a bottom which is equipped with engagement parts at the sides of both side plates, both covers, and a front plate, using elastic material for the right and left side plates and the top and bottom covers in the same form and the front plate of a power converter. SOLUTION: A fan 27 is attached to the downside of the frame 28 where a transistor 25 to be cooled within an air duct 26 is attached. The frame 28 is covered with left and right side plates 23 and 22 in the same form, and top and bottom covers 31 and 32 in the same form are attached to the top and bottom of an inverter. When setting up the left and right side plates 23 and 22, a front plate 24, and the top and bottom covers 31 and 32, a casing in box shape can be made without using screws by engaging the projections and recesses provided each with each other. Hereby, upper and lower covers of different dimensions are obtained by breaking off them at the straight narrow parts of the upper and lower covers, and the number of parts of a casing can be reduced by the communization of parts. Moreover the shortening of distance for insulation becomes possible with the use of insulating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer structure of a power conversion device that covers the periphery of a power conversion device including a semiconductor switch element for power conversion and a fan for cooling the semiconductor switch element.

[0002]

2. Description of the Related Art There are various types of power converters, but the most common one is an inverter device. If this inverter device is used, an induction motor can be operated at a desired rotational speed. Widely used for industrial and consumer use. This inverter device is a device for converting a commercial power supply into AC power having a voltage and a frequency different from those of the commercial power supply, and operates a semiconductor switch element such as a transistor or a thyristor and turns on / off the semiconductor switch element at an appropriate time. And a fan for sending cooling air to the semiconductor switch element, and these are housed in a wall-mounted box unless the apparatus is particularly large in capacity. Therefore, hereinafter, a description will be given of an apparatus having a configuration in which a fan is installed below the inside of an inverter device housed in a wall-mounted box and the cooling air is passed upward from the lower side of the box by the fan.

FIG. 11 is a structural diagram showing a conventional example of the structure of an inverter device. A transistor 5 serving as a semiconductor switch element is mounted on a frame 8, and a cooling fin 6 for dissipating heat generated by the transistor 5 includes:
It protrudes to the rear side of the frame 8. The cooling air sucked from the lower part by the fan 7 is blown to the cooling fins 6 to take heat, and then discharged upward. Bottom plate 1, Right side plate 2,
A box-shaped duct is formed with the left side plate 3 so that the cooling air does not diffuse. A control printed board 9 mounted on a printed board case 10 is mounted on the upper side of the transistor 5, and the control board 9 is covered with the front board 4, so that the casing of the inverter device is formed in a box shape. Further, an upper mounting base 11 and a lower mounting base 12 are attached to the bottom plate 1. With these two mounting tables, the inverter device is mounted on a vertical wall.

[0004]

When the inverter device shown in FIG. 11 is mounted on a wall, the upper cooling air discharge portion and the lower cooling air intake portion have no cover. Therefore, if a foreign object falls from above, there is a possibility that a short circuit may occur due to entering the inside of the device, and a foreign object may enter the fan 7 together with the cooling air from below. Further, if the right side plate 2, the left side plate 3, and the front plate 4 are made of metal, the distance between the charging unit and the charging unit must be increased. The right side plate 2 and the left side plate 3 do not have the same shape, and they must be assembled in a box shape using screws, which is troublesome and disadvantageous in that the number of parts is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of parts of a casing of a power conversion device, to reduce the time and labor required for an assembling operation, and to reduce the size of the entire device.

[0006]

In order to achieve the above-mentioned object, a jacket structure of a power converter according to the present invention comprises a semiconductor switch element for power conversion and turning on / off the semiconductor switch element at an appropriate time. A right side plate and a left side surface covering a right side of a power converter having a control printed board to be turned off, and a fan for creating an air flow from the lower side to the upper side to remove heat from the semiconductor switch element. For the left side plate to cover, the upper cover to cover the upper surface, the lower cover to cover the lower surface, and the front plate to cover the front surface, an insulating material having appropriate elasticity is used. Each of the side plates, the upper and lower covers, and the sides of the front plate is provided with a convex portion and a concave portion which engages with the convex portion. The right side plate and the left side plate are formed into the same shape, and the upper cover and the lower portion are formed. The cover is formed in the same shape, and a box without a bottom is formed by the engagement between the convex portion and the concave portion.

The right side plate and the left side plate have a shape close to a plane. In the upper cover and the lower cover, a portion where the thickness is sharply reduced is provided by a straight line parallel to the bottom of the box. Elliptical protrusions are provided on both sides of the upper end or lower end of the front plate, and the width of the inlet is the minor diameter of the elliptical protrusion on the both side plates, and the width of the part behind it is Either a cutout having a major axis dimension of the elliptical projection is provided, or, conversely, the cutout having the same shape as the above is provided at the upper end of the front plate or a cutout having the same shape as that of the side plate. It shall be provided on both side surfaces of the lower end.

An opening is provided in the front plate, and the opening is closed by a lid provided with a hinge at one end, and the lid can be fixed in a closed state or a fully opened state. A notch is provided at an arbitrary part around the control printed board.
On the other hand, a first projecting portion is provided at a position corresponding to the cutout portion of the control printed board, and the first projecting portion is provided on the both side plates, the upper and lower cover, or the control blind board support in place of the first projecting portion. The second protruding portion is provided at a position different from the portion with a height difference corresponding to the thickness of the control printed board.

[0009]

FIG. 1 is a structural view showing a first embodiment of the present invention, in which an outer casing of an inverter device is disassembled. In FIG. 1, a fan 27 and a wind tunnel 26 through which an air flow generated by the fan 27 passes without diffusing are attached to a lower side of a frame 28. The transistor 25 as a semiconductor switch element shown on the upper side of the frame 28 is actually housed in a wind tunnel 26 and cooled by an air flow. The control printed board 29 is mounted on the upper side of the frame 28, and a digital display 30 is mounted on the control printed board 29.

The right side of the frame 28 is covered with a right side plate 22, and the left side is covered with a left side plate 23. The right side plate 22 and the left side plate 23 have the same shape and are almost almost flat. An upper cover 31 is attached to the upper side of the inverter device, and a lower cover 32 is attached to the lower side. The upper cover 31 and the lower cover 32 have the same shape. Further, a front plate 24 is attached to the front side to make the whole box-shaped. Here, the front panel 24 is provided with an opening 35 at a position corresponding to the digital display 30 mounted on the control printed board 29, so that it is possible to read various set values of the inverter device and current values during operation. Can be. Reference numeral 36 denotes a lid that covers the opening 35.

FIG. 2 is an external view showing an inverter device obtained by combining the jackets shown in the first embodiment of FIG. The right side plate 22, the left side plate 23 shown in FIG.
When assembling the front plate 24, the upper cover 31, and the lower cover 32, a box-shaped jacket is formed by engaging the convex portions and the concave portions provided respectively, so that it is easy to use without using screws. Can be combined.

FIG. 3 is a structural view showing a second embodiment of the present invention, and shows an upper cover. The upper cover has two portions where the thickness is sharply reduced.
That is, the first narrow portion 31A and the second narrow portion 31B are both linear narrow portions. This top cover 3
By bending the hand 1 by hand, it can be easily cut off at a narrow portion. That is, even if the size of the inverter device changes due to the capacity or configuration of the inverter device, the same upper cover 31 is used.
(Or the lower cover 32), so that parts can be shared.

FIG. 4 is a structural view showing an application example of the upper cover shown in FIG.
1A shows a state where the sheet is cut off. FIG. 5 is a structural view showing another application example of the upper cover shown in FIG. 3, and shows a state where the upper cover 31 is cut off by the second narrow portion 31B. FIG. 6 is a structural view showing a third embodiment of the present invention, and shows an oval projection provided on a side plate.

FIG. 7 is a structural view showing a third embodiment of the present invention, and shows a cutout provided in a front plate. If the width of the entrance of the notch 42 provided on the front plate 24 is set to the minor diameter of the elliptical projection 41 provided on the right side plate 22, the front plate 24 is inclined with respect to the oblong projection 41. When rotated to the same angle as, the elliptical projection 41 can enter the inside of the notch 42. Oval projection 41
Can be freely rotated if it enters the notch 42.

FIG. 8 is a structural view showing an embodiment of the third embodiment shown in FIGS. 6 and 7, wherein the front plate 24 has the above-mentioned elliptical projections provided on the right side plate 22 and the left side plate 23. It can be freely rotated with the fulcrum 41 as a fulcrum, and can be removed from both side plates by rotating the front plate 24 to a specific angle.
FIG. 9 is a structural diagram showing a fourth embodiment of the present invention. The front plate 24 is provided with an opening 35. As described above, the value displayed on the digital display 30 mounted on the control printed board 29 can be read from the opening 35. The opening 35 is provided with a lid 36, and the lid 36 can be fixed with the lid 36 shown in an open state or a closed state.

FIG. 10 is a structural view showing a fifth embodiment of the present invention. A first protruding portion 51 is provided on a printed board support that supports the control printed board 29 such as the right side board 22 and the left side board 23. The position and shape of the first protruding section 51 are determined by the control printed board 29. It corresponds to the position and shape of the provided notch 29A. A second protrusion 52 is provided at a position lower than the first protrusion 51 by a thickness t of the control printed board 29 and not at a position directly below the first protrusion 51. Even if the control printed board 29 is lowered from above and the notch 29A passes through the first protrusion 51, the control print board 29 stops there because of the second protrusion 52.
Here, if the control printed board 29 is shifted laterally, the control printed board 29 can be fixed by being sandwiched between the first projecting portion 51 and the second projecting portion 52.

[0017]

According to the present invention, the right side plate and the left side plate constituting the outer casing of the power converter have the same shape, and the upper cover and the lower cover have the same shape. These are all made of insulating material. Molding. Furthermore, since the upper cover and the lower cover are provided with a linear narrow portion, if they are cut off at the narrow portion, upper and lower covers of different dimensions can be obtained, and the effect of reducing the number of parts by sharing parts can be obtained. .
In addition, when forming a box body with these side plates, the upper and lower covers, and the front plate, assembling is carried out by the engagement of the convex portion and the concave portion without using screws, so that the assembling work is simplified and the screw is not required. Is obtained, and the insulation distance can be shortened by using an insulating material, so that the effect of miniaturizing the entire device can be obtained. In addition, an effect of facilitating attachment and detachment of the front panel and the control printed board can be obtained.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a first embodiment of the present invention.

FIG. 2 is an external view showing an inverter device obtained by combining the jacket shown in the first embodiment of FIG. 1;

FIG. 3 is a structural diagram showing a second embodiment of the present invention.

FIG. 4 is a structural view showing an application example of the upper cover shown in FIG. 3;

FIG. 5 is a structural view showing another application example of the upper cover shown in FIG. 3;

FIG. 6 is a structural view showing a third embodiment of the present invention.

FIG. 7 is a structural view showing a third embodiment of the present invention.

FIG. 8 is a structural diagram showing an implementation state of the third embodiment shown in FIGS. 6 and 7;

FIG. 9 is a structural diagram showing a fourth embodiment of the present invention.

FIG. 10 is a structural diagram showing a fifth embodiment of the present invention.

FIG. 11 is a structural diagram showing a conventional example of the structure of an inverter device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom plate 2,22 Right side plate 3,23 Left side plate 4,24 Front plate 5,25 Transistor as a semiconductor switch element 6 Cooling fin 7,27 Fan 8,28 Frame 9,29 Control printed board 10 Printed board case 11 Upper part Installation stand 12 Lower installation stand 26 Wind tunnel 29A, 42 Notch 31 Upper cover 31A First narrow part 31B Second narrow part 32 Lower cover 35 Opening 36 Lid 41 Oval projection 51 First projection 52 Second projection Department

Claims (6)

[Claims] 1. A semiconductor switching device for power conversion, a printed circuit board for controlling the semiconductor switching device to be turned on and off at an appropriate time, and an airflow from a lower side to an upward direction, the semiconductor switching device A power conversion device comprising a fan for removing heat generated by the power conversion device, and covering the semiconductor switch element, the control printed board, and both side surfaces and the front surface of the fan. The left side plate for covering the surface, the upper cover for covering the upper surface, the lower cover for covering the lower surface, and the front plate for covering the front surface are all made of an insulating material having appropriate elasticity. The right side plate and the left side plate have the same shape, and the upper cover and the lower cover have the same shape. And a casing without a bottom formed by engagement of the projections and recesses. 2. An outer casing structure for a power converter according to claim 1, wherein said right side plate and said left side plate have a shape close to a plane. 3. The power converter according to claim 1, wherein the upper cover and the lower cover have a portion where the thickness is sharply reduced by a straight line parallel to the bottom of the box. An outer casing structure of the power converter, wherein the outer casing structure is provided. 4. The power converter device according to claim 1, wherein an oblong protrusion is provided on both sides of an upper end or a lower end of said front plate, and said both side plates have an inlet width dimension. The minor dimension of the elliptical projection is provided with a cutout portion having a width dimension at the depth of the major dimension of the elliptical projection, or the elliptical projection is provided on the both side plates and has the same shape as the above. An outer casing structure for a power converter, wherein a cutout portion is provided on both sides of an upper end or a lower end of the front plate. 5. The power converter device according to claim 1, wherein the opening provided in the front plate and a hinge which can be fixed in a state where the opening is closed or fully opened. A cover structure for a power conversion device, comprising: a cover provided at one end. 6. A cover structure for a power conversion device according to claim 1, wherein a notch provided at an arbitrary portion around the control printed board, and the side plates, the upper and lower covers, or any one of them. A first projection provided at a position corresponding to the notch of the control printed board, and a thickness of the control printed board at a position different from the first projection. And a second protrusion provided with a height difference corresponding to a minute.