JPH0555453A - Electric circuit device - Google Patents

Abstract

PURPOSE:To acquire an electric circuit device which enables replacing an electric part by removing a terminal screw and an attaching screw of an electric part alone which requires maintenance and inspection without removing a terminal screw of other electric part and minimizes bending stress to an electric wiring board by absorbing dispersions in attaching position in height direction of a terminal of the electric part practically. CONSTITUTION:An attaching pedestal 8e provided to an electric part 8 is brought into contact with a rear 9b of a base of an electric part and is attached by screwing. Or, the attaching pedestal part 8e provided to the electric part 8, whose installment position along a height direction of a terminal is made freely adjustable and is fixed to the electric part 8. Thereby, it is possible to perform maintenance and inspection or exchange of a desired electric part without removing a terminal screw 12 of other part and to minimize bending stress to a printed substrate due to dispersions in height of a terminal of an electric part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric circuit device which constitutes an electric circuit with a printed circuit board, and more particularly to an electric circuit device having improved wiring and maintenance inspection between electric circuit parts.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the structure of a conventional electric circuit device disclosed in Japanese Utility Model Laid-Open No. 60-83292. This electric circuit device is an inverter, and its basic circuit diagram is as shown in FIG. That is, reference numeral 1 in the figure denotes a diode module (converter portion) mounted on the inverter base 9 for converting a three-phase alternating current of a commercial frequency into a direct current. Similarly, a short-circuit contact 8 composed of a transistor module 2 for converting a direct current into a three-phase alternating current having a desired frequency, a smoothing capacitor 3 and an electromagnetic contactor is attached at a predetermined position on the inverter base 9. ing.

Further, in FIG. 6, 4 is a power source side terminal, 5 is a load side terminal, and the operation of the transistor module 2 is controlled by the controller 6. Further, 7 is a resistor for limiting inrush current, which is necessary only at the time of starting the inverter and a voltage drop due to this resistor becomes a problem during operation, so that it is short-circuited by the short-circuit contact 8 during operation.

Further, in FIG. 5, 10 is a radiation fin for reducing the temperature rise of each of the electric circuit parts 1 to 3 due to the electric current of the electric circuit, and 11 is a connection between the electric circuit parts 1, 2, 3, 8 and the like. It is a printed circuit board with wiring.

The printed circuit board 11 has main circuit terminals 1a, 2a, 3a, 8a arranged on the upper surfaces of the electric circuit components 1, 2, 3, 8 and the like, and female screw holes 1b for the control terminals 8b. The terminals 2b, 3b, 8c, and 8d are fixed by terminal screws 12 and are electrically connected. Also,
The electric circuit parts 1, 2, 3, 8 are mounted on the mounting base 1 thereof.
C, 2c, 3c, 8e, etc. are attached to the inverter base 9 by tightening them with mounting screws 13.

Reference numeral 14 is a control circuit wiring board, on which the control device 6 is mounted, and which is electrically and mechanically coupled to the electric circuit wiring board 11 by a connector-16. Reference numeral 17 denotes an invertor front cover which closes the opening of the inverter base 9.

In the electric circuit device constructed as described above, the electric circuit parts 1, 2,
3, 8 and the like are attached with mounting screws 13, the printed circuit board 11 is tightened and fixed with terminal screws 12 from above, and these are integrally connected to complete the assembly of the electric circuit.

That is, in such a conventional electric circuit device, the printed circuit board 11 is employed for connecting and assembling the electric circuit, thereby dramatically streamlining and supplying an inexpensive device.

[0009]

Since the conventional electric circuit device is constructed as described above, a dramatic rationalization has been achieved in connection and assembly of the electric circuit. However, it caused inconvenience in maintenance.

That is, the short-circuit contact 8 composed of an electromagnetic contactor requires maintenance and inspection of the contact portion. Specifically, it is necessary to replace the electromagnetic contactor when the contact is consumed and also to replace the electromagnetic contactor when the contact fails (welding).

In such a case, first, it is necessary to remove the electric circuit wiring board 11, but as a result, it is necessary to remove all the terminal screws 12. In other words, it is irrational and inconvenient if the terminal screws of all the other electric circuit parts have to be removed while only wanting to maintain or replace the electromagnetic contactor.

In the case of the conventional electric circuit device as described above, the problem is small because the number of electric circuit parts is small, but the problem is very large in the case where the number of electric circuit parts is large.

Further, since the conventional electric circuit device is configured as described above, the installation height of the terminals of each electric circuit component is different. Therefore, bending stress is applied to the electric circuit wiring board 11 when the terminal screw 12 is tightened. In the worst case, the printed circuit board 11 may be cracked or the printed circuit board 11 may be damaged.

The present invention has been made in view of the above point, and it is possible to replace an electric circuit component very smoothly by only removing the terminal screw and the mounting screw of the electric circuit component which requires maintenance and inspection. The present invention provides an electric circuit device capable of

The present invention also provides an electric circuit device in which the bending stress exerted on the printed circuit board is made extremely small without being influenced by the set positions of the terminals of the electric circuit component.

[0016]

According to the present invention, an electric circuit component is mounted on a base, main circuit terminals and control terminals of the electric circuit component are disposed on one end surface of the electric circuit component, and In an electric circuit device in which a printed circuit board is screwed and fixed on the one end face and is connected to the main circuit terminal and the control terminal, the electric circuit component is attached to a base for attaching the electric circuit component to the main body. The electric circuit device is characterized in that the pedestal is mounted and the mounting pedestal is screwed to the back surface of the base.

According to the present invention, an electric circuit component is mounted on a base, main circuit terminals and control terminals of the electric circuit component are arranged on one end face of the electric circuit component, and the one end face is arranged. In an electric circuit device in which a printed circuit board is screwed and fixed onto the main circuit terminal and the control terminal, the electric circuit parts are attached to the base by screwing on the back surface of the base. The electric circuit device is characterized in that the electric circuit component main body is made movable by a base portion along a direction from the base toward the printed circuit board.

[0018]

According to the electric circuit device of the present invention, the electric circuit parts to be inspected or replaced are removed from the rear side of the base without removing other electric circuit parts not to be inspected. Then, maintenance / inspection or replacement work of the electric circuit parts is performed extremely smoothly.

According to the electric circuit device of the present invention, the mounting position of the electric circuit component from the base to the printed circuit board is set to the optimum position by the mounting base. Then, the bending stress exerted on the printed circuit board by the electric circuit component is eliminated, thereby improving the reliability of the device.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. Example 1. 1 is a sectional view of an electric circuit device according to Embodiment 1 of the present invention. This electric circuit device constitutes an inverter, and its basic circuit diagram is the same as that shown in FIG. Further, the same components as those of the conventional one shown in FIGS. 5 and 6 are designated by the same reference numerals and the description thereof will be omitted.

That is, in FIG. 1, reference numerals 1, 2, 3, and 8 are electric circuit parts similar to those in FIG. 5, and 1 is a diode module.
2, reference numeral 2 is a transistor module, 3 is a smoothing capacitor, and 8 is a short-circuit contact composed of an electromagnetic contactor. Inverter bases support the inner side surfaces of these electric circuit components 1, 2, 3, 8 and the like.

Further, the temperature rise of each of the electric circuit components 1 to 3 due to the electric current of the electric circuit is reduced by the radiation fin 10. A printed circuit board 11 is provided on the upper end surface of each of the electric circuit components 1, 2, 3, 8 and the like, and wiring is provided to connect the electric circuit components 1, 2, 3, 8 and the like. The printed circuit board 11 includes the electric circuit components 1, 2,
Main circuit terminals 1a, 2a arranged on the upper end surfaces of 3, 8, etc.
Female screw holes 1b, 2b, 3 of the control terminals 8b and 3a, 8a
The terminals b, 8c, and 8d are screwed by terminal screws 12 and are electrically connected.

Further, the electric circuit parts 1, 2, 3 and 8 have their mounting bases 1c, 2c, 3c and 8e and the like inverted.
It is attached to the base 9 by tightening the attachment screws 13.

Here, the short-circuit contact 8 composed of an electromagnetic contactor has a contact portion (not shown) therein, but the contact portion is exhausted, and therefore it is a necessary component for maintenance and inspection. ..
Therefore, the inverter base 9 is provided with an insertion hole 9a at a portion to which the short-circuit contact 8 is attached. The short-circuit contact 8 is inserted into the insertion hole 9a from the back surface 9b side of the inverter base. The mounting pedestal portion 8e of the short-circuit contact 8 is in contact with the back surface 9b of the inverter base 9 in the invertor state.
It is fastened and fixed by a mounting screw 13 from the back side 9b of the base.

Further, the control circuit wiring board 14 is used as the control device 6.
Is electrically and mechanically coupled to the electric circuit wiring board 11 by the connector-16. Further, an invertor front cover 17 for closing the opening of the inverter base 9 is provided.

The electric circuit device configured as described above operates as follows. That is, since the short-circuit contact 8 which is a maintenance / inspection necessary part can be attached / detached from the back surface 9b side of the inverter base 9, it can be removed or replaced at the time of maintenance / inspection from the back surface 9b side of the work inverter board. To do. As a result, it is possible to easily remove or replace only the desired maintenance / inspection necessary parts without the work of removing the terminal screws 12 of the other electric circuit parts 1, 2, 3 etc. which need not be removed.

Second Embodiment FIG. 2 is a sectional view of an electric circuit device according to a second embodiment of the present invention. This electric circuit device constitutes an inverter, and its basic circuit diagram is the same as that shown in FIG. Further, the same components as those of the conventional one shown in FIGS. 5 and 6 are designated by the same reference numerals and the description thereof will be omitted.

In the electric circuit device of the second embodiment, the mounting pedestal portion 8e is provided on the short-circuit contact 8 as shown in FIG. 3 so that the mounting position of the terminal in the height direction can be adjusted. The components other than the mounting pedestal portion 8e are the same as those in the first embodiment, so the same reference numerals are used and the description thereof is omitted.

That is, as shown in FIG. 3, the plate-shaped mounting pedestal portion 8e has a mounting hole 8f on one end side thereof and bifurcated engaging projections 8g, 8h on the other end side thereof. is doing. A rotary cam 21 and a wedge 20 are incorporated in the gap between the engagement protrusions 8g and 8h. Rotating cam 2
1 is formed with a cross hole 21a so that it can be rotated by a tool such as a driver.

The engaging protrusions 8g and 8h engage with the engaging groove 8j provided on the side surface of the short-circuit contact 8 to attach in the direction of the height of the terminal (direction of arrow A in the figure). The installation position of 8e can be freely adjusted.

The electric circuit device configured as described above operates as follows. The fact that the short-circuit contact 8 which is a maintenance / inspection necessary part can be attached and detached from the back surface 9b of the inverter base is the same as that of the first embodiment, and therefore its explanation is omitted here. The operation of the structure in which the pedestal portion 8e is attached to the short-circuit contact 8 so that the position thereof can be adjusted in the height direction of the terminal will be described.

That is, as shown in FIG.
When 1 is rotated by a tool such as a screwdriver, the protrusion 21b of the rotating cam 21 moves the wedge 21 from one end of the mounting pedestal 8e toward the other end (to the right in the figure). Let When the wedge 21 moves to the right, the wedge 2
The engaging projections 8g, 8 pushed by the inclined surfaces 20a, 20b of No. 1
Each h opens up and down. Then, the position of the mounting pedestal portion 8e is fixed by being pressed against the engagement groove 8j and its frictional force.

That is, the engagement groove 8j is formed on the side surface of the short-circuit contact 8 along the height direction of the terminal (direction of arrow A). For this reason, the mounting pedestal 8 can be placed at any position along the groove length.
The mounting position of e can be fixed. As a result,
Terminal screw 1
The bending stress applied to the electric circuit wiring board 11 when the 2 is tightened can be minimized.

As a fixing structure for adjusting the position of the mounting pedestal portion 8e, a structure as shown in FIG. 4 is adopted in addition to the rotating cam 21 and the wedge 20 as shown in FIG. can do. That is, although reference numeral 8e in FIG. 4 is a mounting pedestal, an oval mounting hole 8k is formed at one end of the mounting pedestal, and an inclined surface 8l is formed at the other end.

The slope 8l abuts the mounting slope 8m formed on the bottom surface of the main body of the short-circuit contact 8. That is, by connecting the oblong fixing holes 8p formed in the inclined surface 8l to the screw holes 8n formed in the mounting inclined surface 8m and inserting the fixing screws 30 into these holes to tighten them, 8e is fixed to the short-circuit contact 8.

Then, the mounting pedestal portion 8e is indicated by an arrow B in the figure.
The installation position (position in the direction of arrow C) of the mounting pedestal portion 8e can be adjusted by sliding in the direction of and tightening the fixing screw 30.

In the first and second embodiments, the inverter table is used.
Although the fixing structure has been described which can be attached and detached from the rear surface of the device and the installation position of the mounting pedestal portion 8e can be adjusted, other electric circuit parts, that is, the diode module The same structure can be adopted for the module, the transistor module and the capacitor.

In the first and second embodiments, the inverter has been described as an example of the electric circuit device, but it goes without saying that the invention can be applied to other electric circuit devices having a printed circuit board.

[0039]

As described above, according to the present invention, the maintenance required parts can be easily attached to and detached from the rear surface of the electric circuit device, so that the corresponding parts can be removed without removing the terminal screws of other parts. Maintenance and inspection or replacement of parts can be easily performed. Furthermore, it is possible to achieve the rationalization of the wiring assembly that the conventional product has. As a result, it is possible to supply an inexpensive device that is easy to inspect and maintain.

Further, according to the present invention, the mounting pedestal portion of the electric circuit component can freely adjust its position with respect to the electric circuit component in a height direction (terminal height direction) toward the base of the printed circuit board. Since the structure which can be performed is adopted, it is possible to eliminate the occurrence of bending stress on the printed circuit board due to the difference in the terminal height of the electric circuit component.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric circuit device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an electric circuit device according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a fixing structure of a mounting pedestal portion of the electric circuit device according to the second embodiment.

FIG. 4 is a perspective view showing another example of a fixing structure of the mounting pedestal portion.

FIG. 5 is a sectional view of a conventional electric circuit device disclosed in Japanese Utility Model Publication No. 60-83292.

FIG. 6 is a circuit diagram showing a basic circuit of an electric circuit device (inverter).

[Explanation of symbols]

 1 Diode Module 2 Transistor Module 3 Smoothing Capacitor 8 Shorting Contact (Electromagnetic Contactor) 9 Inverter Base 1a Main Circuit Terminal 2a Main Circuit Terminal 3a Main Circuit Terminal 8a Main Circuit Terminal 8b Control Terminal 1b Female Screw Hole 2b Female screw hole 3b Female screw hole 8c Female screw hole 8d Female screw hole 11 Printed circuit board 12 Terminal screw 8e Mounting pedestal 9b Base back surface 13 Mounting screw 8j Engaging groove 8g Engaging protrusion 8h Engaging protrusion 20 Wedge 21 Rotating cam 8l Slope 8m Mounting slope 8p Fixing hole 30 Fixing screw 8n Screw hole

Claims (2)

[Claims] 1. An electric circuit component is mounted on a base, main circuit terminals and control terminals of the electric circuit component are disposed on one end face of the electric circuit component, and a printed circuit board is provided on the one end face. In an electric circuit device in which the main circuit terminal and the control terminal are connected by screwing and fixing the electric circuit component to the base, and the mounting base is attached to the main body of the electric circuit component, and the mounting is performed. An electric circuit device characterized in that a pedestal portion is screwed to the back surface of the base. 2. An electric circuit component is mounted on a base, main circuit terminals and control terminals of the electric circuit component are arranged on one end face of the electric circuit component, and a printed circuit board is provided on the one end face. In the electric circuit device which is fixed by screwing and is connected to the main circuit terminal and the control terminal, the mounting of the electric circuit component to the base is performed by a mounting pedestal portion screwed to the back surface of the base. An electric circuit device characterized in that an electric circuit component main body is made movable along a direction from the base toward the printed circuit board.