JP3637795B2 - Inverter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dustproof and waterproof inverter device.
[0002]
[Prior art]
FIG. 3 is a typical circuit configuration diagram of this type of inverter device, where 1 is an AC power source such as a commercial power source, 2 is an inverter device, and 3 is an electric motor as a load fed from the inverter device 2.
[0003]
The inverter device 2 is formed by a well-known technique, and a diode rectifier circuit 11 that rectifies the voltage of the AC power supply 1, a smoothing capacitor 12 that smoothes the output voltage of the diode rectifier circuit 11, and a voltage across the smoothing capacitor 12. An inverter 13 for converting to AC, a control circuit 14 for controlling the output of the inverter 13 to AC at a desired voltage and frequency for variable speed control of the electric motor 3, and an operating state of the inverter device 2 via the control circuit 14 And an operation panel 15 for operation and display.
[0004]
Depending on the mechanical equipment on which the inverter device 2 and the motor 3 are installed, the operation panel 15 shown in FIG. 3 is integrated with the inverter main body including the diode rectifier circuit 11, the smoothing capacitor 12, the inverter 13, and the control circuit 14. In some cases, the control panel 14 and the operation panel 15 are connected by an extension cable, so that the operation panel 15 is separated from the inverter body.
[0005]
Further, as a required specification from the mechanical equipment, the inverter device 2 may be required to have a dustproof and waterproof structure.
FIG. 4 is a schematic conceptual cross-sectional view showing a conventional example of the dustproof and waterproof structure of the inverter device 2 shown in FIG.
[0006]
In FIG. 4, 21 is a main body case covering the inverter main body, 22 is an upper case of the operation panel portion, 23 is a lower case of the operation panel portion, and the operation panel 15 can be divided into an upper case 22 and a lower case 23. It has become. Reference numeral 24 denotes a control circuit board on which the control circuit 14 that is one of the inverter main bodies is mounted. Reference numeral 24a denotes a main body side connector provided in the control circuit 14 through a square hole provided in the main body case 21 as shown in the figure. Reference numeral 25 denotes an operation panel board on which electronic parts, push buttons, etc. of the operation panel 15 are mounted. Reference numeral 25a denotes a connection between the operation panel 15 and the main body side connector 24a through a square hole provided in the lower case 23 as shown. An operation panel side connector provided on the operation panel substrate 25, 26 is a packing material for sealing between one surface of the main body case 21 and the lower case 23, and 27 is a sealing portion for joining the upper case 22 and the lower case 23. Packing material. Further, as shown in FIG. 4, the operation panel substrate 25 is supported by the lower case 23.
Note that the inverter main body portion other than the portion in contact with the lower case 23 of the inverter main body portion has a dustproof and waterproof structure by the main body case 21 and the like by a known technique.
[0007]
[Problems to be solved by the invention]
According to the dustproof and waterproof structure of the conventional operation panel shown in FIG. 4, the packing material 26 and the packing material 27 having different shapes are required. In particular, as shown in FIG. There is a problem that a step is provided on each of the opposing surfaces that join the two, and a part of the step is sealed with the packing material 27, and the structure of the opposing surfaces of the upper case 22 and the lower case 23 is complicated. .
An object of the present invention is to provide an inverter device having a dustproof and waterproof structure that solves the above problems.
[0008]
[Means for Solving the Problems]
The present invention relates to an inverter main body that converts a DC voltage obtained by converting an input AC voltage by a rectifier circuit and a smoothing capacitor into an alternating current of a desired voltage and frequency by an inverse conversion circuit and supplies power to a load, and the inverter main body An operation panel unit that operates and displays the operation state of the unit, and this operation panel unit can be mounted on one surface of the inverter main body unit and can be separated from the inverter main body unit.
The operation panel is formed of a box-shaped panel case having an opening and a panel bottom plate fitted inside the opening. When the operation panel is mounted on one surface of the inverter main body, an opening of the panel case is formed. The part is opposed to the inverter main body, and the gap between the opening end face of the panel case and one surface of the inverter main body is sealed with a packing material.
[0009]
According to the present invention, the operation panel can be made dustproof and waterproof with a pair of packing materials, and the opening end face of the box-shaped case and one surface of the inverter main body are mutually connected as will be described later. It can be flat.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic conceptual cross-sectional view of the dustproof and waterproof structure of the inverter device 2 shown in FIG. 3 showing an embodiment of the present invention, which is the same as that having the same function as the conventional example shown in FIG. The code is attached.
[0011]
That is, in FIG. 1, in addition to the main body case 21, the control circuit board 24, the main body side connector 24a, the operation panel board 25, and the operation panel side connector 25a, an operation panel case 31 in which one side of the rectangular parallelepiped is opened, and an operation panel An operation panel bottom plate 32 that supports the substrate 25 and has a square hole for the operation panel side connector 25 a and a packing material 33 are provided, and a packing material 33 is provided between the opening end face of the operation panel case 31 and the main body case 21. It is sealed by. The box-shaped case of the operation panel portion can be divided into an operation panel case 31 and an operation panel bottom plate 32. When the operation panel portion is mounted on the main body case 21, the operation panel case 31 and the operation panel bottom plate are arranged. 32, that is, the opening side of the operation panel case 31 is opposed to the main body case 21 side.
[0012]
Accordingly, the gap between the division surfaces of the operation panel case 31 and the operation panel bottom plate 32 and the dustproof and waterproofing between the operation panel portion and the main body case can be performed simultaneously by the single packing material 33.
[0013]
FIG. 2 is a detailed perspective view of the operation panel unit of the present invention. FIG. 2 (a) is an external view seen from the bottom side of the operation panel unit. The operation panel unit is shown in FIG. 2 (b). As shown in the exploded view, the operation panel side connector 25a installed on the back side of the operation panel substrate 25 is passed through the square hole of the operation panel bottom plate 32, and the operation panel substrate 25 is fixed to the operation panel bottom plate 32 with screws 34. A box-shaped case is formed by fitting the operation panel bottom plate 32 inside the opening of the operation panel case 31 (inside the side wall of the operation panel case 31).
[0014]
In FIG. 1, the operation panel case 31 and the operation panel bottom plate 32 are positioned by providing a step on the end surface of the opening on the bottom side of the operation panel case 31 and the outer peripheral portion of the operation panel bottom plate 32. A step may be provided only at the end face of the opening of the panel case 32, and the plate-like operation panel bottom plate 32 may be fitted therein, or a protrusion is provided inside the side wall of the operation panel case 31 to provide a plate-like shape. The operation panel bottom plate 32 may be fitted.
[0015]
When the operation panel portion is integrated with the inverter main body portion, a hollow packing material 33 as shown in FIG. 2B is inserted between the opening end face of the operation panel case 31 and one surface of the main body case 21. As shown in FIG. 2 (A, B), the operation panel section shown in FIG. 2 (A) is fixed to the main body case 21 using the through holes provided in the two corners of the operation panel case 31. That's fine.
[0016]
The material of the packing material 33 is generally a sponge material or a rubber material.
Further, a silicon material or the like may be applied to the opening end face of the operation panel case 31 as the packing material 33.
[0017]
【The invention's effect】
According to the present invention, when the inverter device composed of the inverter main body and the operation panel is made to be dustproof and waterproof, the operation panel can be made dustproof and waterproof with a set of packing materials.
[Brief description of the drawings]
1 is a schematic conceptual cross-sectional view of a dustproof and waterproof structure of an inverter device showing an embodiment of the present invention. FIG. 2 is a partial detailed perspective view of FIG. 1, FIG. 2 (a) is an external view, and FIG. B) Exploded view [Fig. 3] Typical circuit diagram of the inverter device [Fig. 4] Schematic conceptual cross-sectional view of the dustproof and waterproof structure of the inverter device showing the conventional example [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... AC power source, 2 ... Inverter apparatus, 3 ... Electric motor, 11 ... Diode rectifier circuit, 12 ... Smoothing capacitor, 13 ... Inverter, 14 ... Control circuit, 15 ... Operation panel, 21 ... Main body case, 22 ... Case, 23 ... lower case, 24 ... control circuit board, 25 ... operation panel board, 26, 27 ... packing material, 31 ... operation panel case, 32 ... operation panel bottom plate, 33 ... packing material, 34 ... screw.

Claims (1)

Inverter body that converts input AC voltage by a rectifier circuit and a smoothing capacitor into alternating current of a desired voltage and frequency using an inverse converter circuit and supplies power to the load, and operating state of the inverter body In the inverter device that can be mounted on one surface of the inverter main body and can be separated from the inverter main body,
The operation panel is formed of a box-shaped panel case having an opening and a panel bottom plate fitted inside the opening. When the operation panel is mounted on one surface of the inverter main body, an opening of the panel case is formed. the parts are opposed to the inverter main unit side, the inverter apparatus characterized by sealing the through path Kkin material between the one surface of the the opening end surface of the panel case the inverter unit.

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