JP2012023922A - Inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a mounting structure of a terminal block cover so as to ensure safety by making it possible to perform a wiring and inspection work with the terminal block cover moved to an opening/closing position while being held to its housing, and inhibit an inverter from going into an operation mode when the terminal block cover is open.SOLUTION: An inverter device having a control panel 2 located on the upper front face of a housing 1 which includes main components such as a power module, having terminal blocks 3 and 4 mounted on the lower part of the housing being covered, and equipped with a terminal block cover 5 on the front of the housing 1 comprises: the terminal block cover 5 being slidably guided and supported by the housing 1 and being set so as to cover a key on the control panel 2 in the opening position; and a press-in projection piece on the upper end of the cover provided for stopping forcibly the inverter by pressing a stop key on the control panel 2 in the opening position.

Description

  The present invention relates to a general-purpose inverter device, and more particularly to a mounting structure of a terminal block cover that covers the terminal block and is mounted on the front surface of a housing.

  In the conventional inverter device, the main circuit terminal block and control circuit terminal block for external connection are arranged on the front side of the housing containing the core components such as the power module, printed circuit board, and heat dissipation fins of the power device. A structure in which a terminal block cover is detachably attached to the front surface of the casing so as to cover the terminal block is common (see, for example, Patent Document 1).

  In addition, as a small-capacity general-purpose inverter device, a touch panel type operation panel is provided on the upper front surface of the housing, and an external connection terminal block mounted on the lower portion of the housing is covered so as to be removable on the front surface of the housing. A product equipped with a terminal block cover is also known (see, for example, Patent Document 2).

  When wiring work or wiring maintenance inspection is performed with the inverter device configured as described above at the site of use, the inverter is first shut down as the work procedure, and the terminal cover is removed from the housing in this state. After the work is completed, the inverter is started after the removed terminal block cover is mounted on the housing again.

JP-A-5-62724 Japanese Patent Laid-Open No. 11-41951

By the way, the above-described conventional casing structure has the following problems in terms of ensuring safety when performing wiring and inspection work at the installation site of the inverter device.
In other words, when the terminal block cover is removed and wiring / inspection work is carried out for the terminal block built into the housing, the principle is to perform wiring and inspection work after the inverter has been shut down. The terminal block cover can be removed freely regardless of whether the inverter is running or stopped. For this reason, if an operator forgets to stop the inverter and removes the terminal block cover while the inverter is operating and performs work such as wiring replacement and inspection, unexpected operation problems may occur during the operation. is there. In addition, in an inverter device with an operation panel on the front of the housing (see Patent Document 2), even if the inverter is stopped in advance, the keys on the operation panel may be touched during wiring or inspection. When the inverter enters the operation mode, the same trouble as described above may occur.

  In addition, in the conventional structure, the terminal block cover once removed from the housing may be forgotten after wiring work, or if the terminal block cover is not completely installed, the terminal block cover may fall off during operation.

  The present invention has been made in view of the above points, and an object thereof is to solve the above-described problems and move the cover to the open / close position while performing the wiring and inspection work while holding the terminal block cover in the housing. In addition, the terminal block cover and the operation panel are interlocked, and the terminal block cover is attached so that the inverter does not enter the operation mode when the terminal block cover is opened, so that unexpected operation troubles can be avoided. The object is to provide a highly safe inverter device having an improved structure.

In order to achieve the above object, according to the present invention, a touch panel type operation panel is arranged on the upper front surface of a casing containing basic components such as a power module, a printed circuit board, and a heat radiating fin, and at the bottom of the casing. In the inverter device that covers the installed terminal block for external connection and has a terminal block cover on the front of the housing,
As a slide type cover that slides the terminal block cover up and down and moves to the open / close position, the cover is attached to the housing via a slide mechanism (Claim 1). It is comprised in an aspect.
(1) The slide mechanism includes a guide groove formed along the left and right side edges of the housing, and a flange formed on the left and right side edges of the terminal block cover so as to fit in the guide groove, and An engaging protrusion for locking and holding the terminal block cover in the open position is formed in the guide recessed groove, and a notch groove in which the engaging protrusion fits is formed in the flange portion of the terminal block cover.
(2) Further, the terminal block cover sets the slide mechanism so as to cover the operation key of the operation panel arranged at the upper front of the housing in the opened position.
(3) Furthermore, a push-in projection piece for stopping the operation of the inverter by pressing a stop key of the operation panel at an open position of the cover is provided on the upper end portion of the terminal cover.

According to said structure, there can exist the following effect.
(1) First, the terminal block cover is mounted on the front surface of the casing as a sliding cover, so that the terminal block is held in the casing without being removed from the casing as in the conventional structure. Wiring, maintenance and inspection work can be performed with the front of the door open, which makes it easy to open and close the terminal block cover, and prevents the user from forgetting to attach the terminal block cover after work.
(2) Since the terminal panel cover is set to cover the key on the operation panel placed on the top front of the chassis at the open position of the terminal block cover, the inverter enters the operation mode when the hand touches the key on the operation panel during work. It is possible to avoid entering, thereby ensuring high safety.
(3) In addition, the terminal block cover and the operation panel are stopped by providing a pushing projection piece at the upper end of the terminal cover for forcibly pressing the stop key of the operation panel at the open position of the cover to stop the operation of the inverter. By interlocking the key, wiring and inspection can be performed without any safety problems even if you forget to stop the inverter before starting work.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance perspective view of the inverter apparatus by the Example of this invention, Comprising: (a), (b) is a figure showing the state which slidably moved the terminal block cover to the closed position and the open position, respectively. FIG. 2 is an exploded perspective view of FIG. 1. It is a side view of Fig.1 (a). It is an enlarged view of the A section in Fig.1 (a). It is a reverse view of the terminal block cover in FIG. FIG. 2 is a partial cross-sectional enlarged view of a portion B in FIG.

  Hereinafter, embodiments of the present invention will be described based on the examples shown in FIGS. In each figure, 1 is a casing of the inverter device, 2 is a touch panel type operation panel arranged on the upper front surface of the housing 1, and 3 and 4 are main circuit terminals for external connection mounted on the lower front side of the housing 1. And a control circuit terminal block, 5 is a sliding terminal block cover that covers the front surfaces of the terminal blocks 3 and 4 and is mounted on the front surface of the housing 1, and 6 is superimposed on the main circuit terminal block 3 on the housing 1. It is the wiring cover of the assembled main circuit.

  Here, the housing 1 is provided with a heat sink 1a provided with a cooling fan 7, a split case 1b on which basic parts (not shown) such as a power device, a printed circuit board and a capacitor are mounted, and an operation panel 2 on the upper front surface. And it becomes a laminated body structure with the division | segmentation case 1c carrying the said terminal blocks 3 and 4 in the lower half part. On the panel surface of the operation panel 2 arranged on the upper front surface of the housing 1, various keys such as an operation key 2a, a stop key 2b, a program key / reset key 2c, a function key / data switching key 2d, and an up / down key 2e are provided. A touch key and an LED monitor 2f are provided.

  On the other hand, as shown in FIG. 5, the terminal block cover 5 is a molded resin molded product in which the left and right side edges of the cover plate surface are refracted in an L shape toward the back side, and the left and right side edges are directed inward. A flange portion 5a extending in the vertical direction is formed, and a pressing projection piece 5b corresponding to the stop key 2b of the operation panel 2 is formed on the back surface of the upper end of the cover.

  The terminal block cover 5 is guided and supported so as to slide up and down with respect to the housing 1 and move to the open / close position. That is, as shown in FIG. 4, guide grooves 8 in which flanges 5 a (see FIG. 5) formed on both side edges of the terminal block cover 5 are fitted on the left and right side wall surfaces of the housing 1 (divided case 1 c). It is engraved along the vertical direction. A pair of upper and lower engaging protrusions 8 are formed on the upper side of the housing in the guide groove 5a, and the engaging protrusions 8 and 5a of the terminal block cover 5 correspond to the engaging protrusions 8 and A pair of notch grooves 5a-1 that engage with each other is formed.

  With the above configuration, the terminal block cover 5 is held on the front surface of the housing 1 so as to be vertically slidable by fitting the left and right flange portions 5a into the guide groove 8. Here, in the closed position where the terminal block cover 5 is pulled down in the direction of the arrow as shown in FIG. 1A, the terminal block cover 5 covers the front surfaces of the terminal blocks 3 and 4. When the terminal block cover 5 is in the closed position, the lower corners of the cover are held against the corner wall 6a formed protruding from the left and right ends of the wiring cover 6 so as not to drop downward.

  On the other hand, when the terminal block cover 5 is lifted upward as shown in FIG. 1B, the terminal blocks 3 and 4 are exposed. Therefore, the terminal blocks 3 and 4 are accessed in this cover open position to perform wiring and inspection work. It can be performed. In the open position of the terminal block cover 5, the notch groove 5a-1 (see FIG. 5) formed in the flange portion 5a has an engaging protrusion 8a (see FIG. 4) formed in the guide groove 8 of the housing 1. The cover is engaged and held in this open position.

  When the terminal block cover 5 is slid upward toward the open position, an operation panel in which the upper plate surface of the terminal block cover 5 is arranged on the upper front surface of the housing 1 as shown in FIGS. 2 and a push projection 5b (see FIG. 5) provided at the upper end of the terminal block cover 5 pushes the stop key 2b of the operation panel 2 to forcibly stop the operation of the inverter.

  Therefore, even if the operator forgets to stop the inverter in advance and opens the terminal block cover 5, the inverter can be forcibly stopped to perform terminal wiring and inspection work safely. In addition, when the terminal block cover 5 is opened, the touch key of the operation panel 2 cannot be touched by mistake or the touch key cannot be operated, so that the inverter is reliably prevented from entering the operation mode during work. This makes it possible to safely perform terminal wiring and inspection work.

  Moreover, when carrying out wiring and inspection work for the terminal block, there is no need for the troublesome work of removing the terminal block cover 5 from the housing 1 each time and reattaching it after the work as in the conventional structure. Convenient to avoid forgetting to attach the cover like the structure.

DESCRIPTION OF SYMBOLS 1 Case 2 Operation panel 2a-2e Touch key 3 Main circuit terminal block 4 Control circuit terminal block 5 Terminal block cover 5a Eave part 5a-1 Notch groove 5b Pushing protrusion piece 6 Main circuit wiring cover 8 Guide concave groove 8a Engagement Protrusion

Claims (4)

A touch panel type operation panel is placed on the upper front of the chassis with built-in key components such as power modules, printed circuit boards, and heat radiation fins, and the external connection terminal block mounted on the bottom of the chassis is covered. In the inverter device with a terminal block cover on the front,
An inverter device comprising: a sliding cover that slides the terminal block cover up and down to move to an open / closed position; and the cover is mounted on a housing via a sliding mechanism.   The inverter device according to claim 1, wherein the slide mechanism is formed on the left and right side edges of the terminal block cover so as to fit in the guide groove and the guide groove formed along the left and right side edges of the housing. The guide groove is formed with an engaging protrusion for locking and holding the terminal block cover in the open position, and a notch groove in which the engaging protrusion fits is formed on the flange portion of the terminal block cover. An inverter device characterized by that.   3. The inverter device according to claim 1, wherein the terminal block cover has a slide mechanism set so as to cover an operation key of the operation panel at the opened position. 4. 4. The inverter device according to claim 3, wherein a push-out projection for pressing a stop key of the operation panel at an open position of the cover is provided on an upper end portion of the terminal cover.