JPH11346078A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a cooling fan to be quickly replaced and easily changed in capacity without changing a cooling fan mounting pad. SOLUTION: A first cooling fan 15 and a second cooling fan 19 provided to an electronic device are mounted on a common cooling fan mounting pad 30. The cooling fan mounting pad 30 is equipped with a first cooling fan mounting leg 37 and a second cooling fan mounting leg 33 which are so structured as to be capable of coping with a change in size and number of the cooling fans 15 and 19. A first and a second cooling fan mounting screw hexagon nut insertion opening, 32 and 34, which are each conformable in size to a first and a second cooling fan mounting screw hexagon nut are provided to the cooling fan mounting legs 37 and 33 at mountable positions corresponding to the number of them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electronic device for sending cooling air to a large heating element and an electronic circuit.

[0002]

2. Description of the Related Art An inverter device connected to a commercial power supply to obtain AC power of a desired voltage and frequency has a converter circuit for converting commercial power to DC power, and a DC power output from the converter circuit for converting the DC power to a desired voltage. It is an inverter circuit that converts the frequency into AC power. These converter circuits and inverter circuits are generally composed of semiconductor switching elements such as transistors, but these semiconductor switching elements generate a loss during power conversion and raise the temperature of the elements. In particular, when power conversion is performed by a control method such as pulse width modulation control, the semiconductor switch element performs switching operation at a very high frequency, so that the amount of heat generated also increases. By the way, as is well known, when the junction temperature exceeds a predetermined value, the semiconductor switch element is thermally destroyed and the device cannot be operated. On the other hand, since the semiconductor switch element has a small heat capacity, it is necessary to take measures to avoid thermal destruction by sending cooling air to the semiconductor switch element. Further, since these semiconductor switch elements perform power conversion by sequentially turning on and off appropriate elements at appropriate times, they are provided with a control circuit composed of electronic components for such control. However, since this control circuit also causes a loss, cooling is necessary.

Therefore, an inverter device will be described below as an example of an electronic device, and the details of the present invention will be described with the inverter device. In this case, a semiconductor switch element corresponds to the heat-generating component, and a control circuit corresponds to the electronic circuit, and the control circuit is generally formed of a printed board. The first cooling fan is a fan for cooling the semiconductor switch element, and the second cooling fan is a fan for cooling the control circuit.

FIG. 9 is an external view showing the external appearance of a conventional inverter device. As shown in FIG. 9, the inverter device is often a wall-mounted structure having a box 1 and a box mounting leg 2. In the case of a wall-mounted box, internal maintenance and inspection can only be performed from the front side.Therefore, when the front side cover is removed, there is a printed circuit board with the control circuit installed. Semiconductor switching devices. The inside of the box 1 is divided forward and backward by this semiconductor switch element portion, and a partition plate (shown by a broken line in FIG. 9) not shown separates the front and rear. Since the semiconductor switch element and the printed board are housed in the box front part 3 on the front side of the partition plate, maintenance, inspection and replacement can be easily performed by opening the front cover.

[0005] On the other hand, the cooling fins protrude from the rear part 4 of the box behind the partition plate. The rear part 4 of the box is a wind tunnel, and the heat generated in the semiconductor switch element is transmitted to cooling fins projecting into the wind tunnel. Cooling air sent into the wind tunnel by the first cooling fan, which cannot be shown because it is installed at the lower part of the box 1, takes heat from the cooling fins. As a result, the warmed air is discharged from the cooling air discharge section at the upper part of the box 1, where a wire mesh 5 for preventing foreign substances from falling and entering the inside of the box 1 is provided.
Is provided.

[0006] The second cooling fan 6 is installed above the front part 3 of the box body, and radiates heat generated from a control circuit and the like to the outside of the box body 1 by drawing air in this part. In general, the amount of heat generated by the control circuit is smaller than the amount of heat generated by the semiconductor switch element. Therefore, the amount of cooling air introduced by the second cooling fan 6 may be small, so that the second cooling fan 6 is larger than the first cooling fan. Small capacity.

That is, the inverter device shown in FIG.
The first cooling fan installed on the lower side of the box 1 is a push-in ventilation system that sends cooling air into the wind tunnel, and the second cooling fan 6 is installed on the upper side of the box 1 to suck out the air inside the box. Although it is an induction ventilation system, the first cooling fan may be an induction ventilation system, or the second cooling fan may be a push-in ventilation system. Therefore, both the cooling fans can be of the induced ventilation type, or both can be of the forced ventilation type.

FIG. 10 is a structural view showing a first conventional example of mounting a cooling fan. In FIG. 10, for example, the second cooling fan 6 is a cooling fan mounting plate 7 formed by processing a metal plate.
A screw 9 is attached to the cooling fan mounting plate 7. If necessary, a terminal 9 and a phase-advancing capacitor for a cooling fan (not shown) are also mounted on the cooling fan mounting plate 7, and then the cooling fan mounting plate 7 is mounted in the inverter device. It will be attached with another screw.

FIG. 11 is a structural view showing a second conventional example of mounting a cooling fan. In FIG. 11, for example, the second cooling fan 6 is a cooling fan mounting plate 10 formed by processing a metal plate.
The screw 11 and the nut 12 are attached to the cooling fan mounting plate 10, and if necessary, a terminal or a phase-advancing capacitor may be mounted on the cooling fan mounting plate 10 as described above.

[0010]

The inverter device comprises a semiconductor switch element and a device for controlling the semiconductor switch element.
It is a stationary device as a whole. However, since the cooling fan for removing heat generated from the inverter device has a movable portion, it is mechanically damaged. That is, there is a life. Therefore, when the cooling fan is used for a long time, the cooling fan may be stopped due to a failure such as damage to the bearing portion. As described above, since the heat capacity of the semiconductor switch element is extremely small, if the cooling fan stops, thermal breakdown occurs in a short time. Therefore, normally, a protection device for interrupting the operation of the inverter device at the same time as the stop of the cooling fan is provided, so that the operation cannot be resumed unless the cooling fan is replaced with a new one.

Therefore, in order to minimize the stoppage time of the inverter device, it is necessary to quickly remove the cooling fan and install a new one. However, since the first cooling fan requiring a large air volume and the second cooling fan having a smaller air volume are often mounted in different places with different mounting structures, it is troublesome to replace them separately. It takes. In addition, when a plurality of these fans are used, the trouble is further increased, and the inconvenience that the stop time of the inverter device becomes longer is caused. Further, there is a disadvantage that it takes time to tighten a plurality of cooling fans and their phase-advancing capacitors to the mounting plate with screws and nuts in a narrow place in the inverter device and to connect an electric circuit.

Further, if the capacity of the inverter device is changed, the amount of generated heat also changes, so that the capacity of the first cooling fan and the capacity of the second cooling fan must be changed.
When the capacity of the cooling fan is changed, its outer dimensions and mounting dimensions are changed, so that there is also a disadvantage that each cooling fan mounting plate must be changed. Therefore, an object of the present invention is to make it possible to quickly replace a cooling fan and to easily change the capacity of a cooling fan without changing a cooling fan mount.

[0013]

In order to achieve the above-mentioned object, an electronic device according to the present invention comprises a heat-generating component that consumes a large amount of power and generates heat, an electronic circuit, and cooling of the heat-generating component and the electronic circuit. In an electronic device including a cooling fan that sends air and a box that stores these, the box includes a partition plate that separates a storage location of the heat-generating component and a storage location of the electronic circuit, A first cooling fan for sending cooling air to the heat generating component and a second cooling fan for sending cooling air to the electronic circuit;
The cooling fan and the cooling fan are mounted on a common cooling fan mount.

This cooling fan mounting base has first cooling fan mounting legs that can be mounted even if the first cooling fan has a different size or number, and the second cooling fan has a different size or number. And a second cooling fan mounting leg which can be mounted even when the second cooling fan is mounted. The first cooling fan mounting leg is for a first hexagon nut in which the opposite side dimension and the thickness dimension of the hexagon nut adapted to the screw for mounting the first cooling fan are the vertical dimension and the horizontal dimension of the groove having a rectangular cross section. A groove is provided at a position corresponding to the screw for attaching the first cooling fan. The second cooling fan mounting leg is for a second hexagon nut in which the opposite side dimension and the thickness dimension of the hexagon nut adapted to the screw for mounting the second cooling fan are the vertical dimension and the horizontal dimension of the groove having a rectangular cross section. The groove is formed in the second
It shall be provided at a position corresponding to the cooling fan mounting screw.

[0015]

FIG. 1 is a structural view showing a first embodiment of the present invention, in which two first cooling fans 15 and one second cooling fan 19 are provided. 3 shows a state where the cooling fan is mounted on a common cooling fan mounting base 30. That is, the first cooling fan 15 and the second cooling fan 19 are arranged above the inverter device to draw cooling air from the inside of the device. This is because if the inverter device is installed above the inverter device, it is easy to remove or attach the cooling fan even when the inverter device is stored in a switchboard or the like. However, it goes without saying that each cooling fan may be installed at the lower part of the inverter device and the cooling air may be pushed in and ventilated. In any case, the cooling fans are collectively installed on the upper or lower part of the inverter device.

The first cooling fan 15 and the second cooling fan 19
In the present invention, a cooling fan mounting base 30 is used to collectively install the above. The cooling fan mounting base 30 has mounting legs for installing the first cooling fan 15 and the second cooling fan 19, but also includes mounting holes for mounting the phase-advancing capacitor 20 and wires for connecting electric wires. The terminal block 31 and the metal fittings 21 for the terminal are also provided. Reference numeral 16 denotes a protective cover for preventing foreign substances from entering the first cooling fan 15, and reference numerals 17 and 18 denote screws and nuts for mounting the first cooling fan 15.

FIG. 2 is a structural view showing a second embodiment and a third embodiment of the present invention, and shows a state where the cooling fan mount 30 shown in FIG. 1 is viewed from the same direction as FIG. I have. The cooling fan mounting base 30 is a synthetic resin molded product, and has a terminal block 31 on the upper surface side, first cooling fan mounting nut insertion holes 32 as eight first hexagon nut grooves, and second cooling fan mounting bases 32 respectively. Six second cooling fan mounting legs 33 having second cooling fan mounting nut insertion holes 34 as hexagon nut grooves, and two phase-advancing capacitor mounting holes 35
And two phase-advancing capacitor detents 36.

The eight first cooling fan mounting nut insertion openings 32 are provided so that any two of the first cooling fans 15 having two different capacities can be mounted. The two cooling fan mounting legs 33 are provided so that one or two of the second cooling fans 19 can be mounted. Here, each of the mounting nut insertion holes 32 and 34 is a rectangular hole having a size suitable for the opposite side dimension and the thickness dimension of the nut. If the nut is dropped into this rectangular hole, the nut cannot be rotated. The screw can be screwed into the nut without holding down the nut.

FIG. 3 is a structural view showing a second embodiment and a third embodiment of the present invention in a state where the cooling fan mounting base shown in FIG. 2 is viewed from the opposite direction. FIG. 4 is a structural view showing a second embodiment and a third embodiment of the present invention in which the cooling fan mounting base shown in FIG. 2 is turned upside down with the terminal block in front. A plurality of mountain-shaped first cooling fan mounting legs 37 project from the back surface (lower surface portion) of the cooling fan mounting base 30.

FIG. 5 shows a second embodiment and a third embodiment of the present invention in which the cooling fan mounting base shown in FIG. 2 is turned upside down with the terminal block being on the opposite side (in a direction opposite to that of FIG. 4). FIG. First cooling fan mounting leg 37 protruding in a chevron shape
There are four first cooling fan mounting holes (for small size) 38 and first cooling fan mounting holes (for large size) 39. Screws for mounting the cooling fan are inserted into these holes, and the screws are screwed into the nuts dropped from the first cooling fan mounting nut insertion holes 32 to mount the first cooling fan 15 to the cooling fan mounting base 30. . At this time, since the nut cannot be rotated, only the screw needs to be rotated, so that the mounting operation can be performed quickly and smoothly. Further, the first cooling fan mounting leg 37 is also provided with two nut insertion holes 40 for a phase advance capacitor. The nut insertion hole 40 for the phase advance capacitor is formed into a hexagonal shape according to the outer shape of the nut to be used. If this is done, the mounting and operation of the phase advance capacitor 20 can be performed quickly and smoothly as described above.

FIG. 6 is a plan view of the cooling fan mount shown in FIG. 2 as viewed from directly above. FIG. 7 is a cross-sectional view of a cooling fan mounting base showing a second embodiment and a third embodiment of the present invention.
It is sectional drawing and has shown the AA part in the top view of FIG. In FIG. 7, the cooling fan mounting base 30
A nut insertion port 34 for mounting a second cooling fan
There are six second cooling fan mounting legs 33 provided with a, b, c, d, e, and f from left to right, and when one second cooling fan 19 is provided, b And e, and when there are two second cooling fans 19, a and c
Attach one unit and d and f to attach the other unit. The first cooling fan mounting legs 37 projecting from the lower surface side of the cooling fan mounting base 30 in a chevron shape have four first cooling fan mounting holes (for small size) 38 and a first cooling fan mounting hole (for large size). 4) 39 are provided, and a mounting hole to be used is selected according to the size of the first cooling fan 15.

FIG. 8 is a second sectional view showing a second embodiment and a third embodiment of the present invention in another section of the cooling fan mounting base, and shows a BB portion in the plan view of FIG. ing.
In FIG. 8, as shown in FIG. 7, there are six second cooling fan mounting legs 33 provided with the second cooling fan mounting nut insertion port 34 on the upper surface side of the cooling fan mounting base 30, as described above. On the slope of the first cooling fan mounting leg 37 projecting from the lower surface of the cooling fan mounting base 30 in a mountain shape, two nut insertion holes 40 for a phase-advancing capacitor are provided for mounting a phase-advancing capacitor. A first cooling fan mounting nut insertion port 32 for mounting the first cooling fan is also provided.

[0023]

In the conventional electronic device, a first cooling fan for cooling the main circuit semiconductor switch element which generates a large amount of heat with operation, and a control circuit (heat generation) for controlling the operation of the semiconductor switch element are provided. (The amount is relatively small.) Separately provided with the second cooling fan that cools down, maintenance and inspection work and replacement work are troublesome, and the mounting base of each cooling fan also corresponds to the mounting location and fan capacity However, since it is necessary to adopt a structure having a complicated structure, there is a disadvantage that the number of parts is increased.

On the other hand, according to the present invention, all the cooling fans and their accessories (such as phase-advancing capacitors and terminal blocks) are mounted together on the cooling fan mounting base. If the stand is removed from the electronic device, maintenance, inspection and replacement of the cooling fan can be performed quickly in a wide area, so that even if the cooling fan fails, the effect of minimizing the downtime of the electronic device can be obtained. . Furthermore, since this cooling fan mounting base has a structure that can respond to changes in the cooling fan capacity and changes in the number of cooling fans used, even if the cooling capacity required by the electronic device changes, the cooling fan mounting base can be changed. Since it is possible to quickly respond to the request, an effect of suppressing an increase in the number of parts is also obtained.

[Brief description of the drawings]

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

FIG. 2 is a structural diagram showing a second embodiment and a third embodiment of the present invention.

FIG. 3 is a structural diagram showing a second embodiment and a third embodiment of the present invention in a state where the cooling fan mounting base shown in FIG. 2 is viewed from the opposite direction.

FIG. 4 is a structural view showing a second embodiment and a third embodiment of the present invention in which the cooling fan mounting base shown in FIG. 2 is turned upside down with the terminal block in front;

FIG. 5 is a structural view showing a second embodiment and a third embodiment of the present invention in which the cooling fan mounting base shown in FIG. 2 is turned upside down (in a direction opposite to FIG. 4) with the terminal block being on the other side.

FIG. 6 is a plan view of the cooling fan mounting base shown in FIG. 2 as viewed from directly above;

FIG. 7 is a first sectional view showing a second embodiment and a third embodiment of the present invention in a cross section of a cooling fan mounting base.

FIG. 8 shows another cross section of the cooling fan mount according to the second embodiment of the present invention.
Second sectional view showing the embodiment and the third embodiment

FIG. 9 is an external view showing the external appearance of a conventional inverter device.

FIG. 10 is a structural diagram showing a first conventional example of mounting a cooling fan.

FIG. 11 is a structural diagram showing a second conventional example of mounting a cooling fan.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Box 2 Mounting leg 3 Box front 4 Box rear 5 Wire mesh 6 Second cooling fan 7,10 Cooling fan mounting plate 9,31 Terminal block 15 First cooling fan 16 Protective cover 19 Second cooling fan 20 Capacitor 21 Terminal fitting 30 Cooling fan mounting base 32 First cooling fan mounting nut insertion hole as first hexagonal nut groove 33 Second cooling fan mounting leg 34 For mounting second cooling fan as second hexagonal nut groove Nut insertion port 35 Phase-advancing capacitor mounting hole 36 Phase-advancing capacitor detent 37 First cooling fan mounting leg 38 First cooling fan mounting hole (for small) 39 First cooling fan mounting hole (for large) 40 For phase-advancing capacitor Nut insertion port

Claims (3)

[Claims] 1. A heat-generating component that generates heat by consuming a large amount of electric power, an electronic circuit including a semiconductor element and related components, a cooling fan that sends cooling air to the heat-generating component and the electronic circuit, and a box housing these components An electronic device comprising: a first cooling fan that sends a cooling air to the heat-generating component, wherein the box includes a partition plate that separates a space for storing the heat-generating component and a space for storing the electronic circuit; An electronic device, comprising: a second cooling fan that sends cooling air to the electronic circuit; and a cooling fan mounting base that mounts each of the cooling fans on a common base. 2. The electronic device according to claim 1, wherein the cooling fan mounting base includes a first cooling fan mounting leg that can be mounted even if the first cooling fan has a different size or quantity. An electronic device comprising: a second cooling fan mounting leg to which the second cooling fan can be attached even if the size or the number of the second cooling fan is different. 3. The electronic device according to claim 1, wherein the first cooling fan mounting leg provided on the cooling fan mounting base has a size opposite to a hexagonal nut adapted to the first cooling fan mounting screw. A first hexagonal nut groove having a configuration in which the vertical dimension and the horizontal dimension of a groove having a rectangular cross section are provided at a position corresponding to the first cooling fan mounting screw; The second cooling fan attachment leg provided on the second cooling fan has a configuration in which the opposite side dimension and the thickness dimension of the hexagon nut adapted to the second cooling fan attachment screw are the vertical dimension and the horizontal dimension of a groove having a rectangular cross section. An electronic device, wherein a hexagon nut groove is provided at a position corresponding to the second cooling fan mounting screw.