CN2508360Y - Iron-core filter reactor - Google Patents

Abstract

The utility model relates to an iron core filter reactor. The utility model consists of an iron core and a coil 2, the iron core consists of an upper iron core 1, a lower iron core 4, and an iron core upright column 3 arranged between the upper iron core and the lower iron core, and the coil 2 is sleeved on an iron core upright column 3. The utility model is characterized in that the iron core upright column 3 adopts the sectional folding of each layer 5, each section is separated with insulating material 6, the padding layer air gap of the iron core and the cross section of the iron core obtain the better matching, in this way, the linearity of the iron core is raised, and the loss is greatly reduced again; the coil 2 adopts the winding of a copper belt 10, the skin effect of a conductor is greatly reduced, the capacitance distributed between the turns and between the layers is greatly reduced, thereby the equivalent alternating current resistance of the reactor drops, and the quality factor of the reactor is enhanced.

Description

Iron core filter reactor

The utility model relates to an iron core filter reactor. It belongs to a special transformer element. It is mainly suitable for a special reactance element in a power filter for suppressing harmonics of the power grid and an inductance element in other circuits that require high linearity and high Q value inductance elements.

At present, there are many types and types of various iron core reactors, but the following deficiencies generally exist:

1. The iron core column adopts integral stacking, the linear range is narrow, and the iron core loss is large, so it cannot be applied in power filters.

2. The coil winding material is enameled wire or flat copper wire, and the surface area is small, which makes the skin effect of the conductor high, and the distributed capacitance between turns and layers is large, so that the equivalent AC resistance of the reactor is large and the quality factor is small. Only 5~8 at the test frequency of 1000Hz.

3. Reactors are generally impregnated with insulating varnish. The disadvantage is that the insulation strength is low, and the working noise of the reactor is large, generally at 50-60 decibels.

Therefore, only air-core reactors can be used in filters at present. However, the volume of the air-core reactor is very large, and the space requirement is very high, which makes the installation volume of the filter large.

The purpose of the utility model is to overcome the above disadvantages and provide a high linearity and low loss iron core filter reactor.

The purpose of this utility model is achieved in this way: an iron core filter reactor includes an iron core and a coil, the iron core includes an upper iron core, a lower iron core, and an iron core column placed between the upper and lower iron cores, and the coil sleeve It is made on the iron core column, and its characteristic is that the iron core column is stacked layer by layer, and each section is separated by insulating material.

The coil of the utility model is wound with copper tape.

Compared with the existing iron core reactor, the utility model has the following advantages:

1. Change the original iron core column from integral stacking to layer-by-layer stacking, and isolate each section with insulating material, so that the air gap of the cushion layer of the iron core and the cross-section of the iron core can be optimally matched, thereby ensuring At 3 times the rated current, the inductance value remains in the linear region. The iron core can be stacked in building blocks. In this way, the linearity of the iron core is increased, and the loss is greatly reduced. At the same time, the installation is simple and the design is flexible.

2. Change the winding material of the original coil from enameled wire and flat copper wire to copper tape winding. In this way, since the surface area of copper tape is much larger than that of enameled wire or flat copper wire with the same cross-sectional area, the skin effect of the conductor is greatly reduced. The inter-turn and inter-layer distributed capacitance is greatly reduced, thereby reducing the equivalent AC resistance of the reactor and improving the quality factor of the reactor. At the same time, the quality factor reaches 45-55 under the test frequency of 1000Hz. It has increased by about 10 times, so that the core reactor can completely replace the air-core reactor in the filter, which reduces the equipment cost and reduces the installation volume by half, and its economic benefits are very obvious. At the same time, due to the adoption of the above-mentioned several new technologies, the temperature rise is greatly reduced, and the working noise is greatly reduced, which provides a strong guarantee for environmental protection.

3. The filter reactor is sealed with epoxy resin, its insulation strength is improved, and the working noise is greatly reduced, generally no more than 45 decibels.

Fig. 1 is the front sectional view of the utility model.

FIG. 2 is a sectional view of A-A in FIG. 1 .

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As shown in Figures 1-2, the utility model is an iron core filter reactor. It is composed of iron core, coil 2 and upper and lower terminal blocks 17, 18, etc.

The iron core is composed of an upper iron core 1, a lower iron core 4 and an iron core column 3 placed between the upper and lower iron cores 1 and 4. There are three iron core columns 3 among the figure. The iron core column 3 is stacked layer by layer with the upper iron core 1 and the lower iron core 4 to form a building block type stacked iron core structure. Layers 5 are separated by insulating gasket 6 to ensure the best fit between the air gap of the magnetic circuit and the cross section of the iron core. Upper iron core 1, lower iron core 4 and iron core column 3 both sides are clamped with fastening splint 12, and are fixed with fastening bolt 15, upper and lower iron yoke 13,19. The function of the fastening splint is to clamp and connect the upper and lower iron cores and the middle iron core column to ensure that the air gap of the iron core does not change due to transportation. An insulating bushing 16 and an insulating bushing 14 are sheathed on the bolt 15 . Its function is to ensure that there will be no short circuit between the fastening bolts and the lower iron choke and upper iron choke to cause eddy current loss.

The coil 2 is set on the iron core column 3 and is made of multiple turns of copper strips, and each turn is composed of a coil skeleton 11 , a copper strip 10 , an interlayer insulation 9 and an air duct skeleton 8 . The copper strip 10 is wound on the bobbin 11, and the interlayer insulation 9 is arranged on the outer periphery of the copper strip 10, and its function is to separate each layer of copper strips for insulation. The air duct frame 8 is placed between each coil, and its function is to separate each coil to form a ventilation duct, so as to ensure the heat dissipation of the entire reactor and reduce the temperature rise. The innermost coil bobbin is set on the iron core column 3 , and the outer circumference of the outermost copper strip is covered with an outer insulating layer 7 . Finally, impregnate and dry the whole reactor with epoxy resin to improve the overall insulation strength of the reactor and reduce working noise.

Claims (5)

1. An iron core filter reactor, comprising an iron core and a coil (2), the iron core comprising an upper iron core (1), a lower iron core (4) and an iron core column (3) placed between the upper and lower iron cores ), the coil (2) is sleeved on the iron core column (3), and it is characterized in that the iron core column (3) is stacked layer by layer (5), with insulation material (6) isolating between each section. 2. An iron core filter reactor according to claim 1, characterized in that the coil (2) is wound with a copper strip (10). 3. An iron core filter reactor according to claim 1, characterized in that the entire filter reactor is sealed with epoxy resin. 4. An iron core filter reactor according to claim 1, characterized in that both sides of the upper and lower iron cores (1), (4) and the iron core column (3) are clamped by fastening splints (12) . 5. An iron core filter reactor according to claim 4, characterized in that fastening bolts (15), upper and lower iron yokes (13), (19) FIXED.

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