CN2583783Y - Iron hoop-free dry reactor - Google Patents

Abstract

An iron-less dry-type reactor, including a coil and an air duct, is characterized in that: the coil is covered with an inner iron core column with a circular cross-section, and the inner iron core column is electrically connected to the innermost layer of the coil. There is an air passage between them; the coil jacket has a magnetic shielding layer with a circular cross-section, the magnetic shielding layer is electrically connected to the outermost layer of the coil, and there is an air passage between the two; the inner core column and the magnetic The shielding layer is made of magnetically permeable material, and the inner and outer sides and both ends of the shielding layer are covered with insulating layers. The midpoint of the inner core column is electrically connected to the midpoint of the innermost layer of the coil; the midpoint of the magnetic shielding layer is electrically connected to the midpoint of the outermost layer of the coil. The dry-type reactor without iron yoke provided by the utility model has the following technical advantages: it has a magnetic shielding effect, which greatly weakens the magnetic field in the surrounding space; it ensures that instruments and meters are not disturbed by the magnetic field. The structure is simple, the loss is low, and the volume is small; its inductance value is constant in the range of larger current multiples.

Description

A dry-type reactor without iron yoke

technical field

The utility model relates to a reactor, in particular to an iron-less dry-type reactor.

Background technique

With the development of the power system and the increase of large-scale electrical equipment, the amount of reactors is increasing. At present, there are mainly two types of reactor structures:

(1) The core reactor has the advantage of low loss, but due to its high magnetic flux density, the inductance value is nonlinear, and the structure is more complicated and the noise is larger.

(2) The advantages of the air-core reactor are that the inductance value is constant, the structure is simple, and the noise is small, but its loss is large, the volume is large, and its magnetic field interferes greatly with surrounding instruments and meters.

In recent years, several types of non-iron yoke dry-type reactors (also known as half-core type) have been developed in China, and their performance is between the two, such as a magnetically shielded dry-type air-core reactor disclosed in 98233242.4 . Compared with iron-core reactors, its inductance linearity is much better; compared with air-core reactors, its loss is much smaller and its volume is much smaller. However, the magnetic flux density of the reactor is difficult to increase, resulting in a large loss.

Contents of the invention

The object of the present invention is to provide a non-iron yoke dry-type reactor capable of overcoming the above-mentioned defects. The magnetic flux density of the reactor is greatly improved and the loss is small.

In order to achieve the purpose of the above invention, a yokeless dry-type reactor, including a coil and an air duct, is characterized in that: the coil is covered with an inner iron core column with a circular cross-section, and the inner iron core column and the innermost layer of the coil There is an electrical connection between the two, and there is an air passage between the two; the coil jacket has a magnetic shielding layer with a circular cross-section, and the magnetic shielding layer is electrically connected to the outermost layer of the coil, and there is an air passage between the two; Both the inner iron core column and the magnetic shielding layer are made of magnetically permeable material, and the inside and outside and both ends are covered with insulating layers.

The midpoint of the inner core column is electrically connected to the midpoint of the innermost layer of the coil; the midpoint of the magnetic shielding layer is electrically connected to the midpoint of the outermost layer of the coil.

The dry-type reactor provided by the present invention has the following technical advantages:

(1) Simple structure, low loss and small volume.

(2) Its inductance value is constant in the range of larger current multiples.

(3) When equipped with a magnetic shielding layer, it has a magnetic shielding effect, greatly weakening the magnetic field in the surrounding space; ensuring that instruments and meters are not disturbed by the magnetic field.

Description of drawings

Fig. 1 is a schematic structural diagram of a dry-type reactor of the present invention.

Detailed ways

The utility model proposes a dry-type reactor without iron yoke with a new structure. As shown in FIG. There is no iron yoke between the inner core column 2 and the outer magnetic shielding layer 3 . The coil 1 is wound by insulated wires, and the coil type can be a multi-layer parallel structure or a series structure. The inner core column 2 can be a circular iron core column or an annular cross-section iron core column. The iron core column is made of silicon steel sheets or other magnetically conductive materials, and the inside and outside and both ends of the core column are covered with insulating layers. The midpoint of the inner core column is electrically connected to the midpoint of the innermost layer of the coil 1. The outer magnetic shielding layer 3 is a circular cross-section core column made of silicon steel sheets or other magnetically conductive materials. Insulation layer, the midpoint of which is electrically connected to the midpoint of the outermost layer of coil 1, the outer magnetic shielding layer 3 and the outer circle of coil 1 are separated into an air passage 4 by braces, and the inner core column 2 and the inner circle of coil 1 are separated by braces The strips are divided into air passages 4', and the air passages play the role of insulation and heat dissipation.

The structure of the utility model is not limited to the content of the above-mentioned embodiments. When the reactor coil has a circular cross-section, the magnetic shielding layer may not be placed outside the coil. The utility model can make the design of the reactor more flexible, and can reduce the production cost. When the capacity of the reactor is small, it can be made as a reactor with a square cross section, or part or all of the cross section of each component can be square.

Claims (3)

1, a kind of iron-free yoke dry reactor comprises coil and air flue, it is characterized in that: being with the cross section in the described coil is the inner iron core post of annular, does electric the connection between inner iron core post and the coil innermost layer, is separated with air flue between the two; Described coil is with the magnetic masking layer that the cross section is an annular outward, and magnetic masking layer is done electric the connection with the coil outermost layer, also is separated with air flue between the two; Described inner iron core post and magnetic masking layer are made by permeability magnetic material, and its inside and outside two ends that reach are surrounded by insulating barrier.

2, reactor according to claim 1 is characterized in that: do electric the connection between the mid point of the mid point of described inner iron core post and coil innermost layer.

3, reactor according to claim 1 and 2 is characterized in that: the mid point of described magnetic masking layer is done electric the connection with the outermost mid point of coil.

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