Patent Description:
For example, <CIT> (PTL <NUM>) discloses a transformer device including: a stack formed by stacking a W-phase, a V-phase, and a U-phase in the up-down direction; and a highly rigid inner frame. The inner frame includes: a base box on which the stack is placed; and a frame body disposed on the base box to surround the stack. A pair of suspension bolts for lifting up and transporting the transformer device are connected to an upper end of the frame body.

In the transformer device disclosed in the above-mentioned PTL <NUM>, the pair of suspension bolts used for lifting up the transformer device are connected to the frame body surrounding a core of a transformer. In such a configuration, however, a heavy weight of the transformer acts on the frame body, and thus, the frame body surrounding the stack needs to be entirely firmly formed. This may increase the manufacturing cost of the transformer device.

Thus, an object of the present invention is to solve the above-described problem and to provide a transformer device that can be reduced in manufacturing cost in a configuration with consideration given to an operation of lifting up the transformer device.

A transformer device according to one aspect of the present invention includes: a transformer including a core and a coil wound around the core; a suspension tool attachment unit disposed above the coil and connected to the core; and a cover body having an internal space that accommodates the transformer and connected to the suspension tool attachment unit. A suspension tool for suspending the transformer device including the transformer and the cover body is attachable to the suspension tool attachment unit. The transformer includes a first phase transformer, a second phase transformer stacked above the first phase transformer, and a third phase transformer stacked above the second phase transformer. The suspension tool attachment unit is connected to the core of the third phase transformer. The transformer device further includes: a first connection member that connects the core of the first phase transformer and the core of the second phase transformer; a second connection member that connects the core of the second phase transformer and the core of the third phase transformer; and a lower frame disposed below the first phase transformer and connected to the first phase transformer. The cover body is supported by the suspension tool attachment unit and the lower frame. The cover body is provided with: a first opening located below the first phase transformer and allowing communication between the internal space and a space outside the internal space; and a second opening located above the third phase transformer and allowing communication between the internal space and the space outside the internal space. An air flow is formed such that air flows into the internal space through the first opening and is discharged to the space outside the internal space through the second opening.

A transformer device according to another aspect of the present invention includes: a transformer including a core and a coil wound around the core; and a suspension tool attachment unit disposed above the coil and connected to the core. A suspension tool for suspending the transformer device is attachable to the suspension tool attachment unit.

According to the transformer device configured as described above, the suspension tool attachment unit to which the suspension tool is attachable is connected to the core of the transformer, and thereby, a heavy weight of the transformer can be exerted on the suspension tool attachment unit disposed above the coil when the transformer device is lifted up. This makes it possible to reduce the manufacturing cost of the transformer device in the configuration with consideration given to the operation of lifting up the transformer device.

The transformer includes a first phase transformer, a second phase transformer stacked above the first phase transformer, and a third phase transformer stacked above the second phase transformer. The suspension tool attachment unit is connected to the core of the third phase transformer. The transformer device further includes: a first connection member that connects the core of the first phase transformer and the core of the second phase transformer; and a second connection member that connects the core of the second phase transformer and the core of the third phase transformer.

According to the transformer device configured as described above, when the transformer device is lifted up, a heavy weight of the transformer including the first phase transformer, the second phase transformer, and the third phase transformer stacked in the up-down directions can be exerted on the suspension tool attachment unit.

The transformer device further includes: a lower frame disposed below the first phase transformer and connected to the first phase transformer; and a cover body having an internal space that accommodates the first phase transformer, the second phase transformer, and the third phase transformer and supported by the suspension tool attachment unit and the lower frame.

According to the transformer device configured as described above, the cover body is supported by the suspension tool attachment unit and the lower frame, which makes it possible to provide a frameless structure around the first phase transformer, the second phase transformer, and the third phase transformer. Thereby, the configuration of the transformer device can be simplified.

The cover body is provided with: a first opening located below the first phase transformer and allowing communication between the internal space and the space outside the internal space; and a second opening located above the third phase transformer and allowing communication between the internal space and the space outside the internal space. An air flow is formed such that air flows into the internal space through the first opening and is discharged to the space outside the internal space through the second opening.

According to the transformer device configured as described above, the circumference of each of the first phase transformer, the second phase transformer, and the third phase transformer is frameless, so that air as cooling air can flow more smoothly in the internal space. Thereby, the cooling efficiency for the transformer can be improved.

Further preferably, the transformer device further includes an electric device disposed below the first phase transformer and supported by the lower frame.

According to the transformer device configured as described above, the electric device can be disposed by making use of the space below the first phase transformer.

Further preferably, the transformer device further includes a third connection member that connects the cover body and one of the suspension tool attachment unit and the lower frame, and that is adjustable in position in accordance with a mutual positional relation between the cover body and the connected one.

According to the transformer device configured as described above, the mutual positional deviation between the cover body and the above-mentioned connected one can be absorbed by adjusting the position of the third connection member. This makes it possible to facilitate the operation of attaching the cover body.

As described above, the present invention can provide a transformer device that can be reduced in manufacturing cost in a configuration with consideration given to the operation of lifting up the transformer device.

Embodiments of the present invention will be hereinafter described with reference to the accompanying drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference characters.

<FIG> is a perspective view showing a transformer device according to the first embodiment of the present invention. <FIG> is a cross-sectional view showing the internal structure of the transformer device shown in <FIG>.

<FIG> is a perspective view showing a transformer and a frame structure in the transformer device shown in <FIG>. <FIG> is a front view showing the transformer and the frame structure in the transformer device shown in <FIG>. <FIG> is a left side view showing the transformer and the frame structure in the transformer device shown in <FIG>. <FIG> is an exploded assembly diagram partially showing the transformer and the frame structure in <FIG>. <FIG> is an exploded assembly diagram showing remaining portions of the transformer and the frame structure in <FIG>.

Referring to <FIG>, a transformer device <NUM> according to the present embodiment is used for a machine tool such as a lathe, a machining center, a combined processing machine having a lathe turning function and a milling function, or an AM/SM hybrid processing machine capable of performing additive manufacturing (AM) processing for a workpiece and subtractive manufacturing (SM) processing for a workpiece.

By way of example, transformer device <NUM> is installed in a machine tool as a device described below. Specifically, when a machine tool manufactured in the first country adapting the first voltage as a commercial power supply is exported to the second country adapting the second voltage as a commercial power supply, the device as transformer device <NUM> is used for transforming the second voltage supplied to the machine tool in the second country into the first voltage that can be used by the machine tool.

While the figures show "front", "rear", "right", and "left" for convenience of description of the structure of transformer device <NUM>, the relation between each of these directions and the arrangement of the internal structure of transformer device <NUM> is not particularly limited. The figures further show "upper" and "lower". The "upper" side corresponds to the side of a ceiling of a factory or the like where transformer device <NUM> is installed. The "lower" side corresponds to the side of a floor of a factory or the like where transformer device <NUM> is installed.

Transformer device <NUM> includes a transformer <NUM>. Transformer <NUM> forms a main body of transformer device <NUM> that raises or lowers a voltage. Transformer <NUM> includes a core <NUM> and a coil <NUM>.

Core <NUM> is made of a magnetic material. As shown in <FIG> and <FIG>, core <NUM> has a rectangular cylindrical shape. Core <NUM> is provided with a hollow portion <NUM>.

Core <NUM> includes a first vertical rib portion <NUM>, a first lateral rib portion <NUM>, a second vertical rib portion <NUM>, and a second lateral rib portion <NUM>. First vertical rib portion <NUM>, first lateral rib portion <NUM>, second vertical rib portion <NUM>, and second lateral rib portion <NUM> are provided to extend around the circumference of hollow portion <NUM>.

First lateral rib portion <NUM> and second lateral rib portion <NUM> extend such that their longitudinal directions correspond to the horizontal direction (the front-rear direction). First lateral rib portion <NUM> and second lateral rib portion <NUM> are spaced apart from each other in the up-down direction. First vertical rib portion <NUM> and second vertical rib portion <NUM> extend such that their longitudinal directions correspond to the up-down direction. First vertical rib portion <NUM> and second vertical rib portion <NUM> are spaced apart from each other in the horizontal direction (the front-rear direction). The upper end portion and the lower end portion of first vertical rib portion <NUM> are connected to first lateral rib portion <NUM> and second lateral rib portion <NUM>, respectively. The upper end portion and the lower end portion of second vertical rib portion <NUM> are connected to first lateral rib portion <NUM> and second lateral rib portion <NUM>, respectively.

Core <NUM> has a top surface 42a and a bottom surface 42b. Top surface 42a is a horizontal plane facing upward. Top surface 42a is provided on first lateral rib portion <NUM>. Bottom surface 42b is a horizontal plane facing downward. Bottom surface 42b is provided on second lateral rib portion <NUM>.

First lateral rib portion <NUM> has a first side surface 43c and a second side surface 43d. First side surface 43c is a vertical plane facing in the horizontal direction (leftward). Second side surface 43d is disposed on the rear side of first side surface 43c. Second side surface 43d is a vertical plane facing in the horizontal direction (rightward) opposite to the direction in which first side surface 43c faces. Second lateral rib portion <NUM> has a third side surface 44c and a fourth side surface 44d. Third side surface 44c is a vertical plane facing in the horizontal direction (leftward). Fourth side surface 44d is disposed on the rear side of third side surface 44c. Fourth side surface 44d is a vertical plane facing in the horizontal direction (rightward) opposite to the direction in which third side surface 44c faces.

Core <NUM> is provided with a first insertion hole <NUM> and a second insertion hole <NUM>. First insertion hole <NUM> is provided in first lateral rib portion <NUM>. First insertion hole <NUM> is formed as a through hole extending between first side surface 43c and second side surface 43d. First lateral rib portion <NUM> is provided with a plurality of first insertion holes <NUM>. The plurality of first insertion holes <NUM> are spaced apart from each other in the horizontal direction (the front-rear direction). Second insertion hole <NUM> is provided in second lateral rib portion <NUM>. Second insertion hole <NUM> is formed as a through hole extending between third side surface 44c and fourth side surface 44d. Second lateral rib portion <NUM> is provided with a plurality of second insertion holes <NUM>. The plurality of second insertion holes <NUM> are spaced apart from each other in the horizontal direction (the front-rear direction).

Coil <NUM> is formed by winding a conductive wire around core <NUM>. The conductive wire is, for example, a rectangular wire having a rectangular cross section.

Coil <NUM> includes a coil on the input side (a primary-side coil) and a coil on the output side (a secondary-side coil). Coil <NUM> on the input side is provided to extend around the circumference of one of first vertical rib portion <NUM> and second vertical rib portion <NUM>. Coil <NUM> on the output side is provided to extend around the circumference of the other of first vertical rib portion <NUM> and second vertical rib portion <NUM>. First lateral rib portion <NUM> and second lateral rib portion <NUM> are exposed from coil <NUM>.

Transformer device <NUM> includes a U-phase transformer 41U, a V-phase transformer 41V, and a W-phase transformer 41W each as transformer <NUM>.

U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W are stacked in the up-down direction. V-phase transformer 41V (the second phase transformer) is stacked above W-phase transformer 41W (the first phase transformer). U-phase transformer 41U (the third phase transformer) is stacked above V-phase transformer 41V (the second phase transformer).

As shown in <FIG> and <FIG>, V-phase transformer 41V and W-phase transformer 41W are disposed such that bottom surface 42b of core <NUM> included in V-phase transformer 41V and top surface 42a of core <NUM> included in W-phase transformer 41W face each other in the up-down direction. Also, U-phase transformer 41U and V-phase transformer 41V are disposed such that bottom surface 42b of core <NUM> included in U-phase transformer 41U and top surface 42a of core <NUM> included in V-phase transformer 41V face each other in the up-down direction.

Note that the order in which U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W are stacked in the up-down direction is not particularly limited.

Transformer device <NUM> further includes a first connection member <NUM>. First connection member <NUM> connects core <NUM> of W-phase transformer 41W and core <NUM> of V-phase transformer 41V. First connection member <NUM> is made of metal. First connection member <NUM> is made of sheet metal.

First connection member <NUM> has a first angle <NUM> and a second angle <NUM>. First angle <NUM> and second angle <NUM> each are an L-shaped angle.

First angle <NUM> and second angle <NUM> are superimposed on each other in the up-down direction while facing in opposite directions in the up-down direction. First angle <NUM> and second angle <NUM> are connected to each other by a fastening member (not shown) such as a bolt. First angle <NUM> is fastened to second lateral rib portion <NUM> of core <NUM> in V-phase transformer 41V by a fastening member (not shown) such as a bolt. Second angle <NUM> is fastened to first lateral rib portion <NUM> of core <NUM> in W-phase transformer 41W by a fastening member (not shown) such as a bolt.

First connection members <NUM> (first angle <NUM> and second angle <NUM>) are provided as a pair on the right and left sides with cores <NUM> of W-phase transformer 41W and V-phase transformer 41V interposed therebetween. The pair of right and left first angles <NUM> are fastened to second lateral rib portion <NUM> of core <NUM> in V-phase transformer 41V by a fastening member (not shown) such as a bolt that is inserted into second insertion hole <NUM> of core <NUM> in V-phase transformer 41V. The pair of right and left second angles <NUM> are fastened to first lateral rib portion <NUM> of core <NUM> in W-phase transformer 41W by a fastening member (not shown) such as a bolt that is inserted into first insertion hole <NUM> of core <NUM> in W-phase transformer 41W.

Transformer device <NUM> further includes a second connection member <NUM>. Second connection member <NUM> connects core <NUM> of V-phase transformer 41V and core <NUM> of U-phase transformer 41U. Second connection member <NUM> is made of metal. Second connection member <NUM> is made of sheet metal.

Second connection member <NUM> connects core <NUM> of V-phase transformer 41V and core <NUM> of U-phase transformer 41U in the same manner as first connection member <NUM> that connects core <NUM> of W-phase transformer 41W and core <NUM> of V-phase transformer 41V.

Second connection member <NUM> has a third angle <NUM> corresponding to first angle <NUM> in first connection member <NUM>, and a fourth angle <NUM> corresponding to second angle <NUM> in first connection member <NUM>. Third angle <NUM> and fourth angle <NUM> are connected to each other by a fastening member (not shown) such as a bolt. Third angle <NUM> is fastened to second lateral rib portion <NUM> of core <NUM> in U-phase transformer 41U by a fastening member (not shown) such as a bolt. Fourth angle <NUM> is fastened to first lateral rib portion <NUM> of core <NUM> in V-phase transformer 41V by a fastening member (not shown) such as a bolt.

Second connection members <NUM> (third angle <NUM> and fourth angle <NUM>) are provided as a pair on the right and left sides with cores <NUM> of V-phase transformer 41V and U-phase transformer 41U interposed therebetween.

In the above description of the present embodiment, each of first connection member <NUM> and second connection member <NUM> is formed of a combination of two L-shaped angles, but the present invention is not limited thereto. Each of the first connection member and the second connection member in the present invention may be formed, for example, of a flat plate extending between cores of transformers adjacent to each other in the up-down direction.

<FIG> is an exploded assembly diagram showing an upper frame, a third connection member, and a cover body. Referring to <FIG>, transformer device <NUM> further includes an upper frame <NUM> (a suspension tool attachment unit) and a third connection member <NUM>.

Upper frame <NUM> is connected to core <NUM>. Upper frame <NUM> is disposed above coil <NUM> wound around core <NUM>. Upper frame <NUM> is configured such that a suspension tool <NUM> for suspending transformer device <NUM> is attachable thereto.

Upper frame <NUM> is connected to core <NUM> of U-phase transformer 41U. Upper frame <NUM> is connected to first lateral rib portion <NUM> of core <NUM> in U-phase transformer 41U. Upper frame <NUM> is connected to core <NUM> at a position above coil <NUM> in U-phase transformer 41U. Upper frame <NUM> is made of metal. Upper frame <NUM> is made of sheet metal.

Upper frame <NUM> has a vertical plate portion <NUM>, an upper plate portion <NUM>, and a nut <NUM>. Vertical plate portion <NUM> is formed of a flat plate orthogonal to the horizontal direction (the right-left direction). Vertical plate portion <NUM> is fastened to first lateral rib portion <NUM> of core <NUM> in U-phase transformer 41U by a fastening member (not shown) such as a bolt. Vertical plate portion <NUM> extends upward from first lateral rib portion <NUM>. Vertical plate portion <NUM> has a lower end portion 33u located above an upper end portion <NUM> of coil <NUM> in U-phase transformer 41U. Lower end portion 33u of vertical plate portion <NUM> faces upper end portion <NUM> of coil <NUM> in U-phase transformer 41U in the up-down direction.

Upper plate portion <NUM> is formed of a flat plate orthogonal to the up-down direction. Upper plate portion <NUM> is provided at a position angled with respect to the upper end portion of vertical plate portion <NUM> to extend from the upper end portion in the right-left direction. Together with vertical plate portion <NUM>, upper plate portion <NUM> forms a corner portion at an angle of <NUM>°. Upper plate portion <NUM> is disposed on top surface 42a of core <NUM> in U-phase transformer 41U.

Nut <NUM> is fixed to upper plate portion <NUM>. Nut <NUM> is welded to the bottom surface of upper plate portion <NUM> as a back nut. Nut <NUM> can fasten a suspension tool <NUM> that serves to suspend transformer device <NUM>.

As an example shown in <FIG>, suspension tool <NUM> for suspending transformer device <NUM> is an eyebolt including: a ring portion through which a wire, a hook, or the like can be passed; and a threaded portion screwed into nut <NUM>. Suspension tool <NUM> may be a T-shaped bolt including: a lateral shaft portion over which a wire, a hook, or the like can be placed; and a threaded portion screwed into nut <NUM>.

Upper frames <NUM> are provided as a pair on the right and left sides with first lateral rib portion <NUM> of core <NUM> in U-phase transformer 41U interposed therebetween. Vertical plate portions <NUM> of the pair of right and left upper frames <NUM> are fastened to first lateral rib portion <NUM> of core <NUM> in U-phase transformer 41U by fastening members (not shown) such as bolts inserted into first insertion holes <NUM> of core <NUM> in U-phase transformer 41U.

Third connection member <NUM> connects upper frame <NUM> and a cover body <NUM> (a side cover <NUM> and a rear cover <NUM>) which will be described later. The structure of third connection member <NUM> will be described later in detail.

<FIG> is a perspective view showing a lower frame. Referring to <FIG>, transformer device <NUM> further includes a lower frame <NUM> and an angle <NUM>. Lower frame <NUM> is disposed below W-phase transformer 41W. Lower frame <NUM> is connected to W-phase transformer 41W.

Lower frame <NUM> is provided on a floor of a factory or the like where transformer device <NUM> is installed. Lower frame <NUM> is connected to core <NUM> of W-phase transformer 41W. Lower frame <NUM> is connected to second lateral rib portion <NUM> of core <NUM> in W-phase transformer 41W.

Lower frame <NUM> is connected to W-phase transformer 41W through angle <NUM>. Angle <NUM> is an L-shaped angle. Angle <NUM> is fastened to second lateral rib portion <NUM> of core <NUM> in W-phase transformer 41W by a fastening member (not shown) such as a bolt. Angle <NUM> is fastened to lower frame <NUM> by a fastening member (not shown) such as a bolt. Angles <NUM> are provided as a pair on the right and left sides with second lateral rib portion <NUM> of core <NUM> in W-phase transformer 41W interposed therebetween.

Lower frame <NUM> is entirely formed of a frame member having a rectangular parallelepiped appearance. Lower frame <NUM> has a front surface portion <NUM>, a left side surface portion <NUM>, a right side surface portion <NUM>, an upper surface portion <NUM>, a rear surface portion <NUM>, and a lower surface portion <NUM>.

Front surface portion <NUM> is disposed on the front side of lower frame <NUM> having a rectangular parallelepiped appearance. Front surface portion <NUM> is formed of a flat plate orthogonal to the front-rear direction. Left side surface portion <NUM> is disposed on the left side of lower frame <NUM> having a rectangular parallelepiped appearance. Left side surface portion <NUM> is provided with an opening 74p opened upward. Left side surface portion <NUM> has a frame shape extending along the front edge, the lower edge, and the rear edge of opening 74p. Right side surface portion <NUM> is disposed on the right side of lower frame <NUM> having a rectangular parallelepiped appearance. Right side surface portion <NUM> is provided with an opening 75p opened upward. Right side surface portion <NUM> has a frame shape extending along the front edge, the lower edge, and the rear edge of opening 75p.

Upper surface portion <NUM> is disposed on the upper side of lower frame <NUM> having a rectangular parallelepiped appearance. Upper surface portion <NUM> is provided with an opening 76p opened in the right-left direction. Upper surface portion <NUM> has a frame shape extending along the front edge and the rear edge of opening 76p. Angle <NUM> is fastened to upper surface portion <NUM> by a fastening member (not shown) such as a bolt.

Rear surface portion <NUM> is disposed on the rear side of lower frame <NUM> having a rectangular parallelepiped appearance. Rear surface portion <NUM> is provided with an opening 77p opened downward. Rear surface portion <NUM> has a frame shape extending along the right edge, the upper edge, and the left edge of opening 77p. Lower surface portion <NUM> is disposed on the lower side of lower frame <NUM> having a rectangular parallelepiped appearance. Lower surface portion <NUM> is provided with an opening 78p opened frontward and rearward. Lower surface portion <NUM> has a frame shape extending along the right edge and the left edge of opening 78p.

As shown in <FIG> and <FIG>, transformer device <NUM> further includes a cover body <NUM>.

Cover body <NUM> has an internal space <NUM> that accommodates transformer <NUM> (41U, 41V, 41W). Internal space <NUM> further accommodates upper frame <NUM>, third connection member <NUM>, and lower frame <NUM>.

Cover body <NUM> entirely has a rectangular parallelepiped appearance. The length of cover body <NUM> in the up-down direction is greater than the length of cover body <NUM> in the front-rear direction and greater than the length of cover body <NUM> in the right-left direction. Cover body <NUM> is supported by upper frame <NUM> and lower frame <NUM>. Upper frame <NUM> and lower frame <NUM> function as frame members that support cover body <NUM> above and below transformer <NUM> (41U, 41V, 41W).

More specifically, cover body <NUM> has a front cover <NUM>, a side cover <NUM> (<NUM>, 23R), a rear cover <NUM>, and a top cover <NUM>.

Front cover <NUM> is disposed on the front side of cover body <NUM> having a rectangular parallelepiped appearance. Front cover <NUM> is fastened to front surface portion <NUM> of lower frame <NUM> by a fastening member (not shown) such as a bolt.

Side covers <NUM> (<NUM>, 23R) are provided as a pair on the right and left sides. A side cover <NUM> is disposed on the left side of cover body <NUM> having a rectangular parallelepiped appearance, and a side cover 23R is disposed on the right side of cover body <NUM> having a rectangular parallelepiped appearance. Side covers <NUM> and 23R are bilaterally symmetrical in shape.

Side cover <NUM> is provided with a first opening <NUM> and a second opening <NUM>. First opening <NUM> is provided to allow communication between internal space <NUM> and a space outside internal space <NUM>. First opening <NUM> includes a plurality of slits penetrating through side cover <NUM>. First opening <NUM> is located below W-phase transformer 41W. First opening <NUM> is entirely located at a position lower than bottom surface 42b of core <NUM> in W-phase transformer <NUM>. A part of first opening <NUM> may be located at a position lower than bottom surface 42b of core <NUM> in W-phase transformer <NUM>. First opening <NUM> faces, in the horizontal direction (the right-left direction), openings 74p and 75p provided in lower frame <NUM>.

Second opening <NUM> is provided to allow communication between internal space <NUM> and a space outside internal space <NUM>. Second opening <NUM> includes a plurality of slits penetrating through side cover <NUM>. Second opening <NUM> is located above U-phase transformer <NUM>. A part of second opening <NUM> is located at a position higher than coil <NUM> in U-phase transformer <NUM>. Second opening <NUM> may be entirely located at a position higher than coil <NUM> in U-phase transformer <NUM>. Second opening <NUM> faces upper frame <NUM> in the horizontal direction (the right-left direction).

By a fastening member (not shown) such as a bolt, side cover <NUM> (<NUM>, 23R) is fastened to: third connection member <NUM> connected to upper frame <NUM>; and right side surface portion <NUM> or left side surface portion <NUM> of lower frame <NUM>.

Rear cover <NUM> is disposed on the rear surface side of cover body <NUM> having a rectangular parallelepiped appearance. By a fastening member (not shown) such as a bolt, rear cover <NUM> is fastened to: third connection member <NUM> connected to upper frame <NUM>; and rear surface portion <NUM> of lower frame <NUM>.

Top cover <NUM> is disposed on the upper surface side of cover body <NUM> having a rectangular parallelepiped appearance. Top cover <NUM> is provided to cover upper frame <NUM> from above. Top cover <NUM> is fastened to upper frame <NUM> by a fastening member (not shown) such as a bolt. As shown in <FIG>, top cover <NUM> is provided with a through hole 25p through which suspension tool <NUM> such as an eyebolt can be inserted into nut <NUM> provided in upper frame <NUM>.

Cover body <NUM> forms an enclosure surrounding transformer <NUM> (41U, 41V, 41W), whereas upper frame <NUM> does not form such an enclosure. Upper frame <NUM> is accommodated inside (in internal space <NUM> of) cover body <NUM>. Upper frame <NUM> may be provided to extend from a position inside cover body <NUM> at which upper frame <NUM> is connected to core <NUM> of U-phase transformer 41U and penetrate through cover body <NUM> to the outside of cover body <NUM>.

In the case of transportation of transformer device <NUM>, a threaded portion of suspension tool <NUM> such as an eyebolt is screwed into nut <NUM> provided in upper frame <NUM>, and thereby, suspension tool <NUM> is attached to upper frame <NUM>. Suspension tool <NUM> such as an eyebolt may be permanently attached to upper frame <NUM>, or may be prepared when transformer device <NUM> is transported. In the state in which a belt or a hook is placed over suspension tool <NUM> such as an eyebolt, transformer device <NUM> is lifted up using a crane or the like.

In the present embodiment, in transformer device <NUM> having a vertically stacked structure in which cores <NUM> of V-phase transformer 41V and W-phase transformer 41W stacked in the up-down direction are connected to each other by first connection member <NUM>, and cores <NUM> of U-phase transformer 41U and V-phase transformer 41V stacked in the up-down direction are connected to each other by second connection member <NUM>, upper frame <NUM> to which suspension tool <NUM> is attached is connected to core <NUM> of U-phase transformer 41U that is stacked on the uppermost stage among U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W.

In the configuration as described above, when transformer device <NUM> is lifted up, a heavy weight of transformer <NUM> (41U, 41V, 41W) can be exerted on upper frame <NUM> disposed above coil <NUM> of U-phase transformer 41U without cover body <NUM> interposed therebetween. This eliminates the need to provide cover body <NUM> with high rigidity, so that the manufacturing cost of transformer device <NUM> can be reduced.

Further, cover body <NUM> is supported by upper frame <NUM> and lower frame <NUM> disposed above and below transformer <NUM> (41U, 41V, 41W). This configuration eliminates the need to provide a frame member for supporting cover body <NUM> around transformers <NUM> (41U, 41V, 41W) stacked in the up-down direction. This simplifies the structure of transformer device <NUM>, and thereby, the manufacturing cost of transformer device <NUM> can be further reduced.

Cover body <NUM> (side cover <NUM>) is provided with first opening <NUM> and second opening <NUM> as vents. As heat is generated in transformer <NUM> (41U, 41V, 41W), an air flow is formed as shown by arrows in <FIG> such that air flows into internal space <NUM> through first opening <NUM> and is discharged to the space outside internal space <NUM> through second opening <NUM>.

According to the configuration as described above, the circumference of transformer <NUM> (41U, 41V, 41W) is frameless as described above, which allows air as cooling air to flow more smoothly in internal space <NUM>. Thereby, the cooling efficiency for transformer <NUM> (41U, 41V, 41W) can be improved.

Referring to <FIG>, third connection member <NUM> is configured to be adjustable in position in accordance with the mutual positional relation between upper frame <NUM> and cover body <NUM> (side cover <NUM> and rear cover <NUM>). Third connection member <NUM> is configured to be adjustable in position in accordance with the mutual positional relation between upper frame <NUM> and cover body <NUM> (side cover <NUM> and rear cover <NUM>) in the front-rear direction.

More specifically, third connection member <NUM> includes a first connection portion <NUM> and a second connection portion <NUM> (63j, <NUM>). First connection portion <NUM> has a flat plate shape orthogonal to the right-left direction. First connection portion <NUM> is provided with an elongated hole <NUM> having a longitudinal direction extending in the front-rear direction. First connection portion <NUM> is provided with a plurality of elongated holes <NUM> spaced apart from each other in the front-rear direction. First connection portion <NUM> is fastened to upper frame <NUM> (vertical plate portion <NUM>) by a fastening member (not shown) such as a bolt that is inserted into elongated hole <NUM>.

Second connection portion <NUM> is connected to cover body <NUM>. A second connection portion 63j has a flat plate shape orthogonal to the front-rear direction. Second connection portion 63j is provided at a position angled with respect to the rear end portion of first connection portion <NUM> to extend from the rear end portion in the right-left direction. Second connection portion 63j is connected to rear cover <NUM> by a fastening member (not shown) such as a bolt. Second connection portion <NUM> has a flat plate shape orthogonal to the up-down direction. Second connection portion <NUM> is provided at a position angled with respect to the upper end portion of first connection portion <NUM> to extend from the upper end portion in the right-left direction. Second connection portion <NUM> is connected to side cover <NUM> by a fastening member (not shown) such as a bolt.

In the present embodiment, U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W are stacked in the up-down direction, and then, upper frame <NUM> is connected to core <NUM> of U-phase transformer 41U stacked on the uppermost stage, and lower frame <NUM> is connected to core <NUM> of W-phase transformer 41W stacked on the lowermost stage. In the configuration as described above, cover body <NUM> is supported by upper frame <NUM> and lower frame <NUM> spaced apart from each other in the up-down direction, which may cause a positional deviation between cover body <NUM> and upper frame <NUM> or lower frame <NUM>.

In view of the above, by adjusting the position of third connection member <NUM> in the front-rear direction corresponding to the longitudinal direction of elongated hole <NUM>, the positional deviation occurring between upper frame <NUM> and cover body <NUM> (side cover <NUM> and rear cover <NUM>) can be absorbed. This makes it possible to facilitate the operation of attaching cover body <NUM>.

Note that a position adjusting member corresponding to third connection member <NUM> may be provided at a position where lower frame <NUM> and cover body <NUM> are connected.

Referring to <FIG>, transformer device <NUM> further includes an electric device <NUM>. Electric device <NUM> is disposed below W-phase transformer 41W. Electric device <NUM> is supported by lower frame <NUM>.

Electric device <NUM> is an electrical component relating to transformer device <NUM>. Electric device <NUM> may include a terminal block forming a current circuit on each of the input side and the output side of transformer <NUM>, or a breaker that cuts off the current circuit when an overcurrent occurs.

Electric device <NUM> is disposed in a space surrounded by front surface portion <NUM>, left side surface portion <NUM>, right side surface portion <NUM>, upper surface portion <NUM>, rear surface portion <NUM>, and lower surface portion <NUM>. Electric device <NUM> is located to face openings 74p and 75p of lower frame <NUM> in the horizontal direction (the right-left direction). Electric device <NUM> is located to face opening 77p of lower frame <NUM> in the horizontal direction (the front-rear direction).

Electric device <NUM> is attached to lower frame <NUM> with an attachment member <NUM> interposed therebetween. Attachment member <NUM> includes a frame portion <NUM> and a flat plate portion <NUM>. Frame portion <NUM> has a frame shape extending in the horizontal direction (the right-left direction). Frame portion <NUM> extends between lower surface portions <NUM> on the right and left sides in lower frame <NUM>. Flat plate portion <NUM> is formed of a flat plate extending from frame portion <NUM>. Flat plate portion <NUM> extends obliquely upward from frame portion <NUM> as it comes closer to front surface portion <NUM> in the front-rear direction. Electric device <NUM> is mounted on flat plate portion <NUM>.

Note that rear cover <NUM> of cover body <NUM> is provided with a through hole (not shown) through which wires extending from electric device <NUM> pass.

According to the configuration as described above, electric device <NUM> can be disposed by making use of the space below W-phase transformer 41W stacked on the lowermost stage among U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W. Further, air outside cover body <NUM> flows into lower frame <NUM> through first opening <NUM> provided in side cover <NUM> (<NUM>, 23R) and openings 74p, 75p provided in lower frame <NUM>, so that electric device <NUM> can be efficiently cooled.

As a summary of the structure of transformer device <NUM> according to the first embodiment of the present invention described above, transformer device <NUM> according to the present embodiment includes: transformer <NUM> including core <NUM> and coil <NUM> wound around core <NUM>; and upper frame <NUM> disposed above coil <NUM>, connected to core <NUM> and serving as a suspension tool attachment unit to which suspension tool <NUM> for suspending transformer device <NUM> is attachable.

According to transformer device <NUM> in the first embodiment of the present invention configured as described above, the manufacturing cost of transformer device <NUM> can be reduced in the configuration with consideration given to the operation of lifting up transformer device <NUM>.

In the above description of the present embodiment, the suspension tool attachment unit according to the present invention is upper frame <NUM> to which suspension tool <NUM> such as an eyebolt is attachable, but the present invention is not limited thereto. For example, a shackle formed of a U-shaped fitting and a threaded portion serving as a bridge across an opening of the U-shaped fitting can be used as a suspension tool. In this case, a frame body provided with a hole through which the threaded portion of the shackle is passed may be used as the suspension tool attachment unit in the present invention.

Example <FIG> is a cross-sectional view showing a transformer device in an example not falling under the scope of claim <NUM>. <FIG> is a cross-sectional view showing the transformer device taken along an arrow line XI-XI in <FIG>. In the present example, the description of the same configuration as that of transformer device <NUM> in the first embodiment will not be repeated.

Referring to <FIG>, in the present embodiment, U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W are arranged in the horizontal direction. The order in which U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W are arranged in the horizontal direction is not particularly limited.

The transformer device includes an upper frame <NUM> (a suspension tool attachment unit). Upper frame <NUM> is connected to core <NUM> of U-phase transformer 41U, core <NUM> of V-phase transformer 41V, and core <NUM> of W-phase transformer 41W.

Upper frame <NUM> extends in the horizontal direction such that U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W are arranged in the longitudinal direction. Upper frame <NUM> is disposed above core <NUM> of each of U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W. Upper frame <NUM> is fastened by a fastening member such as a bolt to first lateral rib portion <NUM> of core <NUM> in U-phase transformer 41U, first lateral rib portion <NUM> of core <NUM> in V-phase transformer 41V, and first lateral rib portion <NUM> of core <NUM> in W-phase transformer 41W.

Upper frame <NUM> is formed of an L-shaped angle. As shown in <FIG>, upper frames <NUM> are provided as a pair on the right and left sides with core <NUM> of transformer <NUM> (41U, 41V, 41W) interposed therebetween. Upper frame <NUM> is configured such that a suspension tool for suspending a transformer device is attachable thereto. Upper frame <NUM> includes a nut <NUM>. Nut <NUM> can fasten the suspension tool for suspending the transformer device.

The transformer device further includes a cover body <NUM>. Cover body <NUM> accommodates transformer <NUM> (41U, 41V, 41W). Upper frame <NUM> is accommodated inside cover body <NUM>.

According to the configuration as described above, when the transformer device is lifted up, a heavy weight of transformer <NUM> (41U, 41V, 41W) can be exerted on upper frame <NUM> disposed above core <NUM> of each of U-phase transformer 41U, V-phase transformer 41V, and W-phase transformer 41W without cover body <NUM> interposed therebetween. This eliminates the need to provide cover body <NUM> with high rigidity, so that the manufacturing cost of the transformer device can be reduced.

The transformer device according to the example configured as described above can similarly achieve the effect described in the first embodiment.

Note that upper frame <NUM> may be divided between U-phase transformer 41U and V-phase transformer 41V and also between V-phase transformer 41V and W-phase transformer 41W. In this case, nut <NUM> capable of fastening a suspension tool may be provided in at least one of upper frame <NUM> connected to U-phase transformer 41U, upper frame <NUM> connected to V-phase transformer 41V, and upper frame <NUM> connected to W-phase transformer 41W.

By way of example, nut <NUM> capable of fastening a suspension tool is provided in each of upper frame <NUM> connected to U-phase transformer 41U and upper frame <NUM> connected to W-phase transformer 41W. In such a configuration, upper frame <NUM> connected to U-phase transformer 41U and upper frame <NUM> connected to W-phase transformer 41W each correspond to the suspension tool attachment unit according to the present invention.

It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the meaning and scope of the claims.

The present invention is applicable to a transformer device used in a machine tool or the like.

Claim 1:
A transformer device (<NUM>) comprising:
a transformer (<NUM>) including a first phase transformer (41W), a second phase transformer (41V) stacked above the first phase transformer, and a third phase transformer (41U) stacked above the second phase transformer, each phase transformer including a core (<NUM>) and a coil (<NUM>) wound around the core;
a suspension tool attachment unit (<NUM>) disposed above the coil and connected to the core of the third phase transformer (41U), and
a cover body (<NUM>) having an internal space that accommodates the transformer and connected to the suspension tool attachment unit, wherein
a suspension tool (<NUM>) for suspending the transformer device including the transformer and the cover body is attachable to the suspension tool attachment unit,
the transformer device further comprises:
a first connection member (<NUM>) that connects the core of the first phase transformer and the core of the second phase transformer;
a second connection member (<NUM>) that connects the core of the second phase transformer and the core of the third phase transformer; and
a lower frame (<NUM>) disposed below the first phase transformer and connected to the first phase transformer,
the cover body is supported by the suspension tool attachment unit and the lower frame,
the cover body is provided with:
a first opening (<NUM>) located below the first phase transformer and allowing communication between the internal space and a space outside the internal space; and
a second opening (<NUM>) located above the third phase transformer and allowing communication between the internal space and the space outside the internal space, and
an air flow is formed such that air flows into the internal space through the first opening and is discharged to the space outside the internal space through the second opening.