JPH0833347A - Maintenance system for inverter - Google Patents

Abstract

PURPOSE:To minimize the adverse effect due to thermal interference between an electrolytic capacitor, a fan and a heating component to be cooled by providing one module with a handle means for quickly replacing a component by removing the fixing screws in a box thereby replacing the component, requiring periodical replacement, without requiring individual replacement. CONSTITUTION:Components to be replaced periodically, e.g. an electrolytic capacitor 9, a fan 8, a fuse stack 7, etc. are collected at one position and integrated to form a module 5. The module 5 can be replaced with a new one by removing the fixing screws 11 in a box and moving the module 5 integrally using a handle 14 for quick replacement. Since individual replacement is not required, the component requiring periodical replacement can be replaced in a short time and the periodic work is facilitated and rationalized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a maintenance system for periodic preventive maintenance of an inverter device used in a motor for general industry, which requires a high degree of reliability, and in particular, a periodical maintenance system for a product with a long life. The present invention relates to a method and means for efficiently performing exchange.

[0002]

2. Description of the Related Art The following are known examples. That is, the thyristor protection fuse of the thyristor power converter,
By arranging the alarm fuse and the input / output terminals in a row in the lower part of the converter, each fuse can be easily maintained and replaced [JP-A-55-74365].

A deterioration detecting circuit for parts in the power converter is provided to display the replacement cycle of the deteriorated parts. The deterioration detection circuit detects the voltage by integrating the voltage application time or the operating time of each component [Japanese Patent Laid-Open No. 5-56628]. Other known techniques include directly measuring the temperature of the electrolytic capacitor in the power supply device with a temperature sensor to predict the service life in consideration of the ambient temperature, and measuring the ripple current in the DC part to predict the remaining service life. .

However, in [JP-A-55-74365],
There is no mention of a method for periodically replacing a long-life product such as an electrolytic capacitor or a fan. Also, in other known examples,
It is intended to predict the deterioration of a product with a limited life and does not refer to the method of regular replacement work.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to facilitate the work in the regular maintenance work of an inverter device having a life-saving product such as generally known electrolytic capacitors, metal film capacitors, fans and fuses. And to provide comprehensive and rational means of doing so.

Further, the present invention provides a means for minimizing the adverse effect due to the thermal mutual interference between the electrolytic capacitor, whose life is easily influenced by temperature, and the fan and the heat generating parts which are the objects to be cooled.

[0007]

In order to achieve this object, the present invention provides a component having a limited life, which is a regular replacement part for an inverter device, such as an electrolytic capacitor for DC smoothing and a metallic film capacitor for an inverter input surge suppressor. ，
A fan, a fuse, a battery, etc. are integrated into one module as one module, and a means for physically mounting as one solid, that is, a means for mounting so as to be able to be removed, replaced, and reattached is realized. . Generally, a metal fill capacitor has a life of 2-3 times that of an electrolytic capacitor, but it is integrated to facilitate maintenance, and is used as a means for performing batch maintenance.

Further, in the above case, since the modules are mounted at a high density, there is a high potential that the products with a lifetime have physical or thermal interference with each other. In particular, the locus of the wind flow by the fan is important, the life is affected by the ambient temperature, and it is necessary to consider the mutual positional relationship between the electrolytic capacitor and the fan, which physically occupy a relatively large volume. Therefore, a heat shield plate that controls the flow of wind is installed, and a means for reducing this is adopted.

[0009]

By constructing the above-mentioned product having a limited life and serving as a regular replacement part into one module, it is possible to handle and perform maintenance work physically as one object. That is, a handle for transportation is attached to this module so that it can be easily carried as a single unit with a life-span, and at the same time it is attached and detached by operating a minimum fixing means such as one or two screws. It can be realized by As a result, unlike the conventional method, there is no need to spend a lot of man-hours such as opening the inverter box and individually removing and replacing each item with a lifetime. Act to make it practicable by personnel.

The heat shield for controlling the flow of wind is 1
In a state where the modularized object is mounted in the inverter device, the cooling air generated by the fan is arranged so as to efficiently hit the heating element in the inverter device.
Moreover, the warmed wind works so as not to flow back and directly hit the electrolytic capacitor in the module. Also, in this case, when the fan is arranged near the heating element, it functions to reflect the radiant heat and protect the electrolytic capacitor.
Further, by heat conduction, the heat of the electrolytic capacitor is efficiently radiated outside by the cooling air of the fan.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One implementation side is shown in FIGS. In the inverter device on this side, the stack 4 is used as a rectifying circuit for switching from AC to DC. After becoming a direct current,
Electric charges are stored in the electrolytic capacitor 9. This direct current is switched by the operation of the transistor stack 2 and is controlled by the control circuit electronics 13 so that the current flows in a manner similar to the alternating current in a simulated manner. The fuse stack 7 serves to protect the power supply line supplying the control circuit electronics 13 from a short circuit of the power supply line. Resistance 3
Is to alleviate the influence of switching noise on the power supply line, etc., but some kind of cooling is necessary in order to continue heat generation at all times. In this example, forced cooling is performed by the fan 8 together with the transistor stack 2, the thyristor or the stack 4. To be done. Among these electric parts, those that need to be replaced periodically as a life-limited product are the fan 8, the electrolytic capacitor 9, the fuse stack 7, and the metal film capacitor 15 for the surge killer of the inverter input section. Therefore, these are integrated and integrated into one module as shown in FIG. Metal film capacitors have a longer life than electrolytic capacitors, but they are integrated and collectively maintained to simplify maintenance. All electrical wiring to the module is collectively collected in the terminal block 6 or the connector. Therefore,
When this module is replaced, first, the wiring of the terminal block 6 or the connector for the interface is removed to separate the module on the electric circuit. Next, the mounting fixing screw 11 is removed, and the module 5 can be moved as a unit by the handle 14, so that it can be easily replaced with a new replacement module. Usually, it is preferable to access the module 5 only in one direction, for example, only in the front side, in order to facilitate the work. Therefore, in this embodiment, the opposite side of the attachment fixing screw is the attachment hook 12,
It can be easily taken out in the front direction. This allows
Regular replacement parts can be replaced in an extremely short time, and regular work as preventive maintenance can be facilitated and rationalized. In particular, when a large number of inverter devices are provided as in a large plant, it greatly contributes to the efficiency of regular inspection work.

Now, as shown in this embodiment, the fan 8
The cooling air is arranged in the wind direction so as to effectively hit the transistor stack 2, the resistors 3 and the stack 4 which are the heating elements. On the other hand, the electrolytic capacitor 9, the life of which largely depends on the ambient temperature, is inevitably arranged near the fan 8 due to the integrated module. Therefore, the heat shield 1 for efficiently generating the cooling air of the fan 8 without hindering it, preventing the reflected hot air from the object to be cooled, and shielding its radiant heat.
0 is set. The heat shield 10 also serves as a duct for allowing the cooling air of the fan 8 to flow efficiently. That is, the air is accelerated by the fan 8 from the air intake port, and the air is allowed to flow smoothly from the air outlet toward the parts of the object to be cooled. The electrolytic capacitor side of the heat shield 10 has the character of a black body and absorbs heat. On the other hand, in order to block the secondary heat from the object to be cooled, the object to be cooled has a metallic luster so as to have the property of heat reflection and also has thermal conductivity, so that the surface of the object to be cooled is cooled by the fan 8. The heat can be removed by the wind. Further, the heat of the electrolytic capacitor 9 can be guided to the heat shield 10 by heat conduction, so that the heat can be released to the outside. As a result, the effect of heat on the electrolytic capacitor can be reduced, the life of the electrolytic capacitor can be extended, and the electrolytic capacitor functions stably during use.

[0013]

According to the present invention, in the periodic maintenance work of the inverter device, there is an effect that the regular replacement parts having a limited life can be quickly replaced with one touch. This method is very effective especially in a large-scale industrial plant having a large number of inverter devices, and also in a plant that requires maintenance of a large number of devices at once within a short regular inspection period. For example, in nuclear power plants, more and more inverter devices have been introduced in recent years due to their excellent controllability and energy saving. In order to maintain its high reliability, it is necessary to regularly replace the electrolytic capacitors, fans, fuses, etc. in many inverter devices as preventive maintenance. In this case, it is necessary to replace the parts in the shortest possible time and check the soundness of the entire system in a short time. According to the method of the present invention, it is possible to reduce the impact on the regular inspection period, thereby facilitating the shortening of the regular inspection period, and accelerating the technical trend toward improving the operation rate of the operation of nuclear power plants. is there.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of a general inverter device to which the present invention is applied.

[Explanation of symbols]

1 ... Inverter device, 2 ... Transistor stack, 3 ...
Resistance, 4 ... Stack, 5 ... Module, 6 ... Terminal block, 7
... Fuse stack, 8 ... Fan, 9 ... Electrolytic capacitor, 10 ... Heat shield, 11 ... Mounting fixing screw, 12 ...
Attachment hooks, 13 ... Control circuit electronics, 1
4 ... Handle, 15 ... Metal film capacitor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Nemoto 3-2-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Engineering Co., Ltd. (72) Inventor Kazumi Yanagibashi 3--2, Saiwaicho, Hitachi City, Ibaraki Prefecture No. 1 within Hitachi Engineering Co., Ltd.

Claims (4)

[Claims] 1. In an inverter device including a diode, a thyristor, a capacitor, and a radiation fin in a box, regular replacement parts including an electrolytic capacitor, a metal film capacitor, a fuse, and a fan are integrated in one place to form one module shape. And the module has a handle means that can be easily replaced with one touch by removing the fixing mounting screw in the box, and it is possible to replace one module without individually replacing the regular replacement parts. A feature of the inverter maintenance system. 2. The means for arranging the electrolytic capacitor so as not to disturb the flow of fan air in the module, and the reflected air from the heating element cooled by the fan in the inverter device. A maintenance system for an inverter device, which has a means for shielding the electrolytic capacitor from heat and radiant heat and protects the electrolytic capacitor in the module from external heat. 3. The thermal shield according to claim 1, wherein the electrolytic capacitor side has a character as a black body for absorbing radiant heat, and the opposite side has gloss and thermal conductivity for reflecting radiant heat. Maintenance method for the inverter device that is made of metal. 4. The heat shielding plate according to claim 3, which has a function of efficiently guiding the cooling air of the fan to the object to be cooled,
A maintenance method for an inverter device in which the cooling air blows away heat from the surface of the heat shield plate.