JPS6138323Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in a furnace condenser device.

Traditionally, for example, induction melting furnaces have mainly used a method in which an alternating current is passed through a coil wound around the furnace, and the molten material charged in the furnace is melted by the Joule heat generated by the electromagnetic induction effect. It is being adopted. Since such an induction melting furnace has a low power factor due to its structure, in order to improve the power factor, a capacitor of 5 to 6 times the power supply capacity is generally connected in parallel to the coil via a detachable contactor. The capacitor capacity is increased or decreased by a contactor in accordance with the power factor change during the melting process. In addition, when taking a large-capacity single-phase load from a three-phase power supply, the unbalance rate becomes a problem, so in order to compensate for this, a three-phase balancing device, that is, a combination of a balancer capacitor and a reactor, is used. It is intended to be used in combination with a power supply circuit.

FIG. 1 is a circuit diagram showing an example of the configuration of one set of this type of induction melting furnace. In the figure, A is an induction melting furnace connected between the power supplies u and v phases, BA and
BB is a plurality of capacitors connected in parallel to the induction melting furnace A for power factor improvement. BC and BD
are a plurality of balancer capacitors each connected between the phases not connected to the induction melting furnace A, that is, the power supply V and W phases. In addition, the power factor improvement capacitor
BA and balancer capacitor BC are connected to each other via contactors CA and CB so that they can be freely connected to and separated from each other. Also, CC is the balance reactor terminal w ₂ , w ₃
This is a contactor for switching the balance reactor connected between the and W phases. Furthermore, D is a current transformer provided in the balancer circuit to measure the current. The contactors CA, CB, and CC described above are generally switched automatically, but in that case, they are controlled by a control circuit (not shown).

By the way, when actually operating the above-mentioned induction melting furnace, the power factor improvement capacitor BA,
Accessories such as BB, balancer capacitors BC and BD, and contactors CA and CB for changing the capacitor capacity are assembled into a furnace capacitor device.

FIG. 2 is a front view showing an example of the configuration of a conventional furnace capacitor device. Depending on the capacity of the capacitor to be installed, the dimension in the depth direction shown in the figure can be increased or decreased, or the same configuration can be installed in multiple stages, for example, in two stages. , and are used by stacking them in three tiers. In the figure, 1
1 is a rectangular front frame made of angle material, and a back frame (not shown) having the same shape as the front frame 1 is provided at the rear of the front frame 1 in the figure. These front frames 1
A seat 5 is provided on the back frame at a height-direction intermediate portion of each vertical side located on both sides, and a seat 5 is provided at a position above the seat 5, spanning the opposing vertical sides. A section 1a is provided. The front frame 1 and the rear frame are provided with upper and lower frames 2, 3, an intermediate frame 4,
It is connected by a base 7 and a support frame 11. The upper and lower frames 2 and 3 are made of angle members and are provided with their ends fixed to the upper and lower corners of the front frame 1 and the rear frame, respectively.
The intermediate frame 4 is also made of angle material, and the front frame 1
The end portion is fixed to a seat 5 provided on a vertical side of the back frame with a bolt 6. This intermediate frame 4 is detachable so that equipment stored within the frame can be taken in and out during repairs, inspections, etc. Further, the bases 7 are made of channel material, and are provided in two pieces at intervals in the width direction as shown in the figure, and their respective ends are fixed to the lower horizontal sides of the front frame 1 and the rear frame. Further, two support frames 11 are provided, and their end portions are fixed to the widthwise intermediate portions of the upper horizontal sides of the front frame 1 and the back frame, and to the widthwise intermediate portions of each intermediate side portion 1a. In the frame configured in this way, a plurality of capacitors B, BA, BB, BC are placed on the base 7 along the depth direction, and the mounting brackets B1 attached to the sides are connected to the middle by bolts 8. By being fixed to the frame 4, it is supported by the frame body. Further, each contactor C, CA, CB, CC, current transformer D, and other accessories are attached to support plates 11a attached to support frames 11, 11, and supported by the frame body. Furthermore, these capacitors B and contactors C,
The bus bar 9 that connects the current transformer D etc. is a support plate 11a.
, and is insulated and supported by a support 10 provided so as to span between the intermediate sides 1a of the front frame 1 and the rear frame.

In addition, 12a is a protective cover provided to protect the upper half of the side opening of the frame body, and is used to protect the external terminal connection part of the upper part of the capacitor B, the external terminal connection part of the contactor C, the current transformer D, etc. This is for isolating live parts such as the bus bar 9 and the bus bar 9. 12
b is the contactor C in the upper opening of the frame.
This is a protective cover installed to protect the left half of the contactor C as shown in the figure, which is opposite to the contactor. It is. These protective covers 12a and 12b are fixed to the outer surfaces of the front frame 1 and the rear frame with bolts 13, respectively.

By the way, in the furnace capacitor device having the above-mentioned conventional configuration, a support frame 11 for attaching accessories to approximately the center in the width direction of the upper surface opening of the frame body.
exists, and this is the capacitor BA, BB, BC, BD
This poses an obstacle when storing and assembling a plurality of capacitors B in the frame, making it difficult to store them from above. Therefore, the capacitor B must be housed by removing the removable intermediate frame 4 and moving it horizontally from the side of the frame. Therefore, two steps are required: one to move the capacitor B to the installation location using a crane or the like, and the other to move the capacitor B horizontally and store it. When the unit capacity of the unit is very large, its weight becomes heavy, which poses a safety problem.

In addition, when the furnace capacitor device is stacked in multiple stages such as two or three stages depending on the capacity of the capacitor, attaching the protective cover 12b to the top surface of the frame will form a stepped part. In many cases, the protective cover 12b is not attached to the lower furnace condenser device because it becomes an obstacle to stacking. However, since most induction melting furnaces A are installed in foundries with a lot of dust, if the lower furnace capacitor device does not have the protective cover 12b as described above, the side opening of the upper furnace capacitor device will open. There was a risk that dust would enter from the contactor C and adhere to the contactor C, making it impossible to perform contact/separation operations as a contactor. In this case, it is conceivable to provide a protective cover over the entire opening of the frame to prevent dust from entering, but this has the disadvantage that heat dissipation from the heat generating elements such as the capacitor B and the bus bar 9 cannot be carried out sufficiently.

This invention was developed to solve the above problems, and its purpose is to improve the work efficiency and safety of condenser storage and assembly, and to create a furnace for use in which the functions of accessories will not be impaired by dust. The purpose of the present invention is to provide a capacitor device.

An embodiment of the present invention will be described below with reference to FIG.

Figure 3 is a front view showing an example of the configuration of a furnace capacitor device according to the present invention, and the depth dimension can be increased or decreased depending on the capacity of the capacitor installed, or devices with the same configuration can be stacked in multiple stages. It is something to do. In the figure, 101 is a rectangular front frame made of angle material, and behind the front frame 101 in the figure is a back frame (not shown) having the same shape as the front frame 101.
are provided facing each other. These front frames 10
1 and the rear frame, an intermediate side portion 101a is provided at an intermediate portion in the height direction of each vertical side portion located on both sides, spanning both vertical sides. The front frame 101 and the rear frame are arranged between the two
1 upper frame 102, 2 intermediate frames 1
04 and two bases 107 to form a frame. The upper frame 102 is made of an L-shaped angle member, and is provided with one side of the end fixed to the outer surface of each upper corner of the front frame 101 and the back frame, and the other side protruding to the outside of the frame body. . The intermediate frame 104 is also made of L-shaped angle material, and one side of the end is bolted to the middle part in the height direction of the vertical sides of the front frame 101 and the rear frame.
It is fixed with a frame and the other side is located inside the frame so that it can be attached and detached. The base 107 is made of a U-shaped channel material, and is provided at each lower corner of the front frame 101 and the rear frame, with the ends thereof fixed to the inside of the frame.

Incidentally, an upper frame 102 is provided at the middle part in the height direction of each vertical side of the front frame 101 and the rear frame.
A support frame 11 made of angle material faces the
1 can be attached removably,
A support 111a is attached to at least one vertical side so that accessories can be attached as described later. In the embodiment, a support frame 111 is provided only on the vertical side of each frame on the left side in the figure, with one end fixed by a bolt 114 and the other side protruding outward.

and multiple capacitors B, BA, BB, BC
are placed on two bases 107 along the depth direction, and are fixed to the intermediate frame 104 with bolts 108 via fixtures B1 attached to the sides, respectively, and supported by the frame. Also, each contactor C
(CA, CB, CC), current transformer D, and other accessories are attached to the upper frame 102 and the support 111a, and are arranged so as to protrude outside the frame.
These contactors C, current transformers D, etc. are covered and protected by protective covers 112a fixed to the other side of the upper frame 102 and the vertical sides of each frame with bolts 113. Note that on the right side vertical side in the figure where the contactor C etc. are not provided, a protective cover 112b with a low protruding height is attached with bolts 113 to protect the live part without providing a support frame.

On the other hand, the bus bar 109 is insulated and supported by a support 110 that is fixed to each intermediate frame 101a of the front frame 101 and the rear frame and extends in the depth direction.
It is connected to a capacitor B, a contactor C, and a current transformer D via a connecting conductor (not shown) disposed so as to penetrate 1a.

In a furnace condenser device with such a configuration,
Since there is no frame (11 in Figure 2) for attaching accessories in the center of the upper opening of the frame, make the inner dimension of the frame in the width direction 25 mm to 65 mm larger than the maximum width of capacitor B. For example, intermediate frame 1
Even if 04 protrudes inside the frame, the capacitor B can be stored from above the frame. Therefore, the capacitor B can be stored by simply moving it to the vicinity of the upper opening of the frame using a crane or the like and then lowering it onto the base 107 inside the frame. There is no need to perform the difficult work process of moving in different directions. Furthermore, the positioning of the capacitor B can be performed simply and easily, and the working efficiency and safety of storage and assembly can be greatly improved. In this case, unlike the conventional case, the upper frame 102 is arranged so that one horizontal side thereof protrudes outward, so this one horizontal side does not become an obstacle when storing the capacitor B from above. The device can be made smaller by reducing the width dimensions of 101 and the back frame.

In addition, by arranging accessories such as the contactor C on the side of the frame as shown in FIG. 3, and covering the surface with protective covers 112a and 112b, the device can be installed in two or three tiers, etc. When using the protective covers 112a and 1 by stacking them in multiple tiers,
12b can be used without removing it from the frame. As a result, not only can maintenance and inspection of the accessories be performed simply and easily, but also the protective covers 112a and 112b can reliably protect the accessories from dust in factories, etc. The functionality of the product will not be impaired.

As explained above, according to the present invention, it is possible to provide a furnace capacitor device that facilitates the work of storing and assembling a capacitor, improves work efficiency and safety, and prevents the functions of accessories from being impaired by dust.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing a configuration example of a furnace capacitor device used in an induction melting furnace, Fig. 2 is a front view showing a conventional furnace capacitor device, and Fig. 3 is a diagram of a furnace capacitor device according to the present invention. It is a front view showing one example. 101...Front frame, 102...Upper frame,
104...Intermediate frame, 107...Base, 1
09...Bus bar, 110, 111a...Support tool, 111...Support frame, 112a, 112
b...Protective cover, B...Capacitor, B1...
Fixture, C...Contactor, D...Current transformer.

Claims (1)

[Scope of utility model registration request] A rectangular front frame, a rectangular back frame disposed opposite to the front frame, and a rectangular back frame disposed between the front frame and the back frame, each having an end portion protruding outward from the front frame. and an upper frame fixed to the outer surface of the upper corner of the rear frame, and a base disposed between the front frame and the rear frame and having ends fixed to both lower corners of the front frame and the rear frame, respectively. , an intermediate frame disposed between the front frame and the rear frame and having both ends attached to the intermediate portions in the height direction of both vertical sides of the front frame and the rear frame, forming a frame body;
A plurality of capacitors are placed at predetermined positions on the base within this frame, and these capacitors are fixed to the intermediate frame via fixtures provided on each side, and a busbar is arranged above these capacitors. This bus bar is supported by the frame via a support, a support is attached to the upper frame, and accessories such as a contactor are attached to this support so as to protrude outside the frame. A furnace condenser device characterized by having a protective cover covering it.