KR100831212B1 - Magnetron unit - Google Patents

Abstract

A magnetron unit is provided to realize excellent temperature characteristic and to preserve a voltage and power by using a magnet including aluminum, nickel, and cobalt whose thermal property is excellent. Electrons are emitted from an anode cylinder(290). Pole pieces(280) are installed at both ends of the anode cylinder to collect magnetic energy. A magnet(230) is installed in parallel on a side of the anode cylinder. Yokes(221,222) are installed at both ends of the magnet. The yokes form a magnetic circuit between the anode cylinder and the magnet. A spacer(260) is installed between the yoke and the pole piece. The magnet includes at least one of aluminum, nickel, and cobalt. The magnet is symmetrically arranged with respect to a longitudinal central line of the anode cylinder. The magnet is installed to be separated from the anode cylinder. The yokes are comprised of upper and lower yokes. The yokes include a coupling member for coupling the upper and lower yokes.

Description

Magnetron Unit {MAGNETRON UNIT}

1 is a cross-sectional view showing a conventional electrodeless lighting device,

FIG. 2 is a perspective view of the magnetron unit according to FIG. 1; FIG.

3 is a perspective view showing a magnetron unit according to an embodiment of the present invention;

4 is a side view illustrating the magnetron unit according to FIG. 3;

5 is a side view showing the main part of the magnetron unit according to FIG. 3;

6 is a perspective view of the yoke according to FIG. 5;

7 is a perspective view of the anode cylinder according to FIG. 5, FIG.

8 is a perspective view of the magnet according to FIG. 5;

9 shows a spacer according to FIG. 5;

10 is a perspective view of the pole piece according to FIG. 5;

11 is a cross-sectional view of the pole piece according to FIG. 10;

12 is a perspective view of the heat dissipation member according to FIG. 3;

13 is a perspective view showing a modification of the heat radiation member according to FIG.

14 is an experimental graph illustrating a relationship between a width of a yoke and a magnetic field of FIG. 5;

15 is an experimental graph showing a relation between a diameter of a magnet and a magnetic field according to FIG. 5;

16 is an experimental graph illustrating a relationship between a diameter of a spacer and a magnetic field according to FIG. 5;

FIG. 17 is a graph illustrating a light quantity holding performance with respect to the magnet and the conventional magnet of FIG. 5.

** Description of symbols for the main parts of the drawing **

200: magnetron unit 210: output unit

221,222: York 230: Magnet

240,241: heat dissipation member 250: input

260: spacer 270: sealing member

280: pole piece 290: anode cylinder

The present invention relates to a magnetron unit, and more particularly, to a magnetron unit having a magnet including a component having excellent thermal performance.

In general, a plasma lighting system is a lamp device that is recognized as a relatively new light source. The electrodeless lighting device forms an electrodeless bulb by placing a light emitting material such as argon into a quartz sphere having a diameter of 25 to 40 mm, and trapping the electrodeless bulb in a microwave cavity to generate a microwave discharge of 2.45 GHz with a magnetron. It is a lighting device that obtains a continuous spectrum of white light having high luminous efficiency and good color rendering from a light emitting material of a light bulb.

1 is a cross-sectional view showing a conventional electrodeless lighting device, Figure 2 is a perspective view of the magnetron unit according to FIG.

As shown in FIG. 1, a conventional electrodeless lighting device includes a magnetron 20 mounted inside a casing 10 to generate electromagnetic waves, and a commercial AC power is boosted and supplied to the magnetron 20 at a high pressure. The high pressure generator 30 and the waveguide 40 which communicates with the output of the magnetron 20 and transmits electromagnetic waves generated by the magnetron 20, and the outlet of the waveguide 40 communicates with the outlet. A resonator 50 in which electromagnetic waves transmitted through the resonance are resonated, an electrodeless light bulb 60 which is accommodated in the resonator 50 and generates light as the encapsulation material is plasma-formed by electromagnetic energy, and the resonator 50. And the electrodeless bulb 60 is accommodated in the reflection shade 70 for reflecting forward the light generated from the electrodeless bulb 60, and the resonator 50 in the rear side of the electrodeless bulb 60, Dielectric reflecting light while passing electromagnetic waves It is installed on one side of the bowl 80 and the casing 10 is composed of a cooling fan 90 for cooling the magnetron 20 and the high voltage generator 30.

The resonator 50 is formed in a mesh shape so that light can pass while electromagnetic waves can be trapped.

In the drawing, reference numeral “62” is a bulb shaft to which the electrodeless bulb 61 is connected.

As shown in FIG. 2, the conventional magnetron unit according to FIG. 1 includes an input unit 25 for supplying external power to the magnetron unit 20 and an opposite side of the input unit 25 to generate electromagnetic waves. Of the output unit 21 emitting the waveguide 40, the anode cylinder 26 formed between the input unit 25 and the output unit 21 to generate electromagnetic waves, and the anode cylinder 26. A magnet 23 mounted on upper and lower portions, an upper yoke 22a and a lower yoke 22b for supporting the magnet 23, and a heat dissipation member 24 formed to surround the anode cylinder 26; It is configured by.

However, in the conventional magnetron unit 20 as described above, the magnet 23 is formed of ferrite and mounted on the upper and lower portions of the anode cylinder 26, so that the temperature of the magnet 23 rises. There was a problem that a power or voltage loss of the magnetron unit 20 occurred.

In addition, when the conventional magnetron unit 20 is used in the electrodeless lighting device, the amount of light or the light efficiency of the electrodeless lighting device is reduced, and the illumination intensity is lowered and flickers as time passes.

The present invention has been made to solve the problems of the prior art as described above, the present invention by using a magnet containing a component excellent in thermal performance compared to the ferrite, the magnetron that can prevent the performance degradation due to the temperature rise of the magnet To provide a unit.

In addition, another object of the present invention is to provide a magnetron unit that can be miniaturized so that it can be easily applied to an electrodeless lighting device for a street lamp.

The present invention is an anode cylinder for emitting electrons to achieve the object as described above; Pole pieces installed at both ends of the anode cylinder to collect magnetic energy; A magnet installed in parallel with a side of the anode cylinder; A yoke installed at both ends of the magnet to support the magnet and to form a magnetic circuit between the vacuum tube and the magnet; And a spacer installed between the yoke and the pole piece.

By constructing as described above, it is possible to construct a magnetic circuit that can overcome the weakness of the temperature and prevent flickering or darkening caused by the performance degradation due to the fatal temperature for lighting.

In addition, the magnet is characterized by including a component excellent in thermal performance. Here, it is effective that the magnet includes at least one of aluminum, nickel or cobalt having excellent thermal performance. By using the magnet provided with such a component, the temperature coefficient of the magnet can be reduced.

On the other hand, the magnet is characterized in that it is disposed symmetrically with respect to the center line in the longitudinal direction of the anode cylinder. In addition, the magnet is provided spaced apart from the anode cylinder. As a result, a sufficient magnetic field can be generated in the anode cylinder by arranging the magnets in parallel with respect to the anode cylinder.

The yoke is made of an upper and lower yoke, characterized in that it further comprises a fastening member for coupling the upper yoke and the lower yoke. By using the fastening member, even when used for a long time, the fastening force of each component constituting the magnetic circuit can be prevented from loosening.

In addition, a sealing member may be formed between the spacer and the pole piece to prevent leakage of the magnetic closed circuit.

On the other hand, the present invention, the anode is emitted electron; Pole pieces installed at both ends of the anode cylinder and having a central portion protruding therefrom; A cylindrical magnet installed parallel to both sides of the anode cylinder in a longitudinal direction thereof; Yokes respectively provided at both ends of the magnet to support the magnet; A cylindrical spacer disposed between the yoke and the pole piece; And a heat dissipation member surrounding the anode cylinder to protrude heat generated from the anode cylinder and having an extension protruding toward one side of the magnet.

Here, the heat radiating member is formed with a hole for inserting the anode cylinder and the magnet.

By configuring as described above, it is possible to effectively block the heat generated in the anode cylinder from being conducted to the magnet side.

On the other hand, the yoke, characterized in that the width is larger than the diameter of the magnet and smaller than the diameter of the anode cylinder. The maximum intensity magnetic field is created when the width of the yoke that transfers magnetic energy from the magnet towards the anode cylinder is approximately similar to the outer diameter of the anode cylinder.

The pole piece may include a protruding center portion and an edge portion extending radially from an edge of the center portion. By forming in this way, the magnetic field energy can be effectively collected.

In addition, the diameter of the magnet is characterized in that it is larger than the inner diameter of the edge portion of the pole piece and smaller than the diameter of the anode cylinder.

The diameter of the spacer is larger than the outer diameter of the edge portion of the pole piece, characterized in that smaller than the diameter of the anode cylinder.

On the other hand, it is preferable that the magnet contains at least one or more of aluminum, nickel or cobalt. This is because the higher the thermal performance, the more at least one of aluminum, nickel or cobalt is included.

The objects and features of this invention will become more apparent from the following detailed description.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the configuration and operation according to an embodiment of the present invention.

However, in describing the present invention, a detailed description of known functions or configurations will be omitted to clarify the gist of the present invention.

In addition, the same reference numerals are given to the same and the same components as those described above, and detailed description thereof will be omitted.

3 is a perspective view illustrating a magnetron unit according to an exemplary embodiment of the present invention, FIG. 4 is a side view illustrating the magnetron unit according to FIG. 3, and FIG. 5 is a side view illustrating the main part of the magnetron unit according to FIG. 3. .

3 to 5, the magnetron unit 200 according to an embodiment of the present invention, the input unit 250 for supplying external power to the magnetron unit 200, and the input unit 250 An output unit 210 formed on the opposite side of the output unit 210 to emit electromagnetic waves to the waveguide 40 (see FIG. 1), and an anode cylinder formed between the input unit 250 and the output unit 210 to generate electromagnetic waves ( 290, the magnet 230 mounted on the side of the anode cylinder 290, the upper yoke 221 and the lower yoke 222 supporting the magnet 230, the magnet 230 and the anode It is configured to include a heat radiation member 240 formed to surround the cylinder 290.

Here, the upper yoke 221 and the lower yoke 222 are fastened to each other by a fastening member 223. The fastening member 223 is preferably a screw, but is not limited thereto, and riveting may be used.

Magnetron unit 200 according to an embodiment of the present invention constitutes a magnetic circuit as shown in FIG. That is, in the magnetic circuit according to the embodiment of the present invention, the anode cylinder 290 constituting the resonator is disposed in the center portion, and the magnet 230 including aluminum, nickel, and cobalt components is the anode cylinder 290. It is arranged at a predetermined interval on the side of the anode cylinder 290 in parallel with the axial or longitudinal direction of.

In addition, it covers the upper and lower portions of the magnet 230 and is widely distributed perpendicularly to the axial direction of the anode cylinder 290 to connect the magnet 230 to the anode cylinder 290 to form a magnetic closed circuit A spacer 260 is connected to the yoke 221, 222 and the yoke 221, 222, and is connected to a pole piece 280 provided at upper and lower ends of the anode cylinder 290, and the spacer 260 and the pole piece ( 280 between the sealing member 270 of the metal installed between the 280 and the connection between the seal ring member 270 and the pole piece 280 to collect and transfer the magnetic energy in the working space (A) which is an electron movement region It is configured to include).

6 is a perspective view illustrating the yoke according to FIG. 5, FIG. 7 is a perspective view illustrating the anode cylinder according to FIG. 5, FIG. 8 is a perspective view illustrating the magnet according to FIG. 5, and FIG. 9 according to FIG. 5. Figure 10 is a view showing the spacer, Figure 10 is a perspective view of the pole piece according to Figure 5, Figure 11 is a cross-sectional view of the pole piece according to FIG.

6 shows an upper yoke 221 among the yokes 221 and 222. The upper yoke 221 is formed with an anode insertion hole 221a for inserting the anode cylinder 290 in the center portion, and a fastening hole 221b for the fastening member 223 is formed in each corner portion. It is.

Preferably, the upper yoke 221 preferably has a rectangular shape, and a width of the yoke 221 having a short side is referred to as "W".

In FIG. 7, the anode cylinder 290 is illustrated, and the anode cylinder 290 is formed in a cylindrical shape having an outer diameter of “Da”. The shape of the anode cylinder 290 is not limited to a cylindrical shape and may have various shapes depending on the field in which the magnetron unit is used.

As shown in Figure 8, the magnet 230 according to an embodiment of the present invention preferably has a cylindrical shape having a diameter of "Dm", but is not necessarily limited to such a shape.

The magnet 230 includes aluminum (Al), nickel (Ni), cobalt (Co) components having excellent thermal performance. The conventional magnet formed of ferrite has a temperature coefficient of -0.18% / ° C, whereas the temperature coefficient of the magnet 230 according to the present invention containing aluminum, nickel, and cobalt is -0.016% / ° C, which is smaller than that of the conventional ferrite magnet. Here, the temperature coefficient means the degree of change in resistance with temperature change.

When the magnet 230 containing a component having excellent thermal performance according to the present invention is disposed at the same position as that of a conventional ferrite magnet, that is, above and below the anode cylinder, a sufficient magnetic field is not obtained. Accordingly, the magnet 230 according to the present invention is disposed in parallel to the side of the anode cylinder 290 to obtain a sufficient magnetic field.

In addition, it is advantageous to install the magnet 230 as close as possible to the anode cylinder 290 side for a sufficient magnetic field. However, in order to prevent the heat of the anode cylinder 290 from being directly transmitted to the magnet 230, it is preferable to have a predetermined interval therebetween.

As shown in FIG. 9, the spacer 260 has a cylindrical shape having a predetermined thickness and a diameter "Ds".

The spacer 260 is formed between the yokes 221 and 222 and the pole piece 280 to be described later to serve to magnetically connect both.

10 and 11, the pole piece 280 includes a protruding center portion 280a and an edge portion 280b extending radially from an edge of the central portion 280a. It is composed. Here, the hole 280c is formed in the central portion 280a to communicate with the anode cylinder 290.

The protruding center portion 280a is inserted into the anode cylinder 290 to collect magnetic energy and to deliver the energy to the working space A of the anode cylinder 290.

The central portion 280a has a diameter of "Dpi", and the edge portion 280b has a diameter of "Dpo".

12 is a perspective view illustrating the heat dissipation member of FIG. 3, and FIG. 13 is a perspective view illustrating a modification of the heat dissipation member of FIG. 3.

The heat dissipation member 240 of FIG. 12 is a detachable portion having an extension portion 240c attached to a heat sink (not shown), and a portion having an open hole 240b on the other side through which the magnet 230 is inserted. It is separated.

The heat dissipation member 240 has a hole 240a for inserting the anode cylinder 290 and a hole 240b for inserting the magnet 230.

Here, the extension part 240c is formed to have a sufficient length or area so that the heat generated from the anode cylinder 290 is sufficiently conducted to radiate heat toward the heat sink (not shown).

On the other hand, the heat dissipation member 241 shown in FIG. 13 is integral, and its configuration is similar to that of the heat dissipation member 240 of FIG. That is, a hole 241a for inserting the anode cylinder 290 and a hole 241b for inserting the magnet 230 are formed, and an extension 241c for heat transfer to a heat sink (not shown). ) Is formed.

In the magnetic circuit configured as shown in Figure 5, the dimensions of each component affects the strength of the magnetic field, which will be described below.

FIG. 14 is an experimental graph showing the relationship between the yoke width and the magnetic field according to FIG. 5, FIG. 15 is an experimental graph showing the relationship between the diameter of the magnet and the magnetic field according to FIG. 5, and FIG. 16 is a spacer according to FIG. 5. Is an experimental graph showing the relationship between the diameter and the magnetic field, and FIG. 17 is a graph showing the light amount retention performance with respect to the magnet and the conventional magnet according to FIG. 5.

As shown in FIG. 14, the width W of the yokes 221 and 222 for transmitting magnetic energy from the magnet 230 toward the anode cylinder 290 may be equal to the outer diameter Da of the anode cylinder 290. It can be seen that magnetic fields of maximum intensity are produced when they are nearly similar. However, when the widths W of the yokes 221 and 222 are larger than the outer diameter Da of the anode cylinder 290, the leakage energy is increased to reduce the magnetic field.

When the widths W of the yokes 221 and 222 are smaller than the outer diameter Da of the anode cylinder 290, the magnetic energy transfer resistance is increased to decrease the magnetic field and to reach the diameter Dm of the magnet 230 experimentally. The name can be found at 1850 Gauss, which is considered to be the limit of performance.

Accordingly, the range of the preferred width W of the yokes 221 and 222 is greater than or equal to the diameter Dm of the magnet 230 and less than or equal to the outer diameter Da of the anode cylinder 290. That is, the range of Dm ≤ W ≤ Da is an optimal range.

On the other hand, as shown in Figure 15, it can be seen that the larger the diameter (Dm) of the magnet 230, the stronger the magnetic field.

However, the magnet 230, which includes aluminum, nickel, and cobalt components having excellent thermal performance is considerably expensive and should be used only as necessary for performance. Therefore, when the diameter Dm of the magnet 230 is about the diameter Da of the anode cylinder 290, it is possible to secure the strength of the magnetic field as much as necessary, and the larger diameter Dm of the magnet 230 is almost converging. do. The reason for this convergence phenomenon is that as the diameter Dm of the magnet 230 increases, the width W of the yokes 221 and 222 also increases, and the width W of the yokes 221 and 222 is the anode cylinder Da. If larger than), the leakage of the magnetic field increases, which is adversely affected.

When the diameter (Dm) of the magnet 230 is smaller, the magnetic field falls, the performance is guaranteed at about the inner diameter (Dpi) of the central portion (280a) in contact with the sealing member 270 inside the pole piece (280) You can get the limit of 1850 gauss.

Therefore, the optimum range of the diameter Dm of the magnet 230 is Dpi ≦ Dm ≦ Da.

In addition, FIG. 16 illustrates the relationship between the diameter Ds of the spacer 260 and the magnetic field.

When the diameter Ds of the spacer 260 is equal to the outer diameter Dpo of the edge portion 280b of the pole piece 280, which collects and transfers magnetic field energy when it is transmitted to the working space A. If the magnetic field is maximum, and larger than Dpo, the strength of the magnetic field decreases due to leakage phenomenon. If smaller than Dpo, the magnetic resistance increases, and the strength of the magnetic field drops.

However, since the diameter Da of the anode cylinder 290 is suitable in a region larger than the diameter Dpo of the edge portion 280b of the pole piece 280, the optimum diameter Ds of the spacer 260 is optimal. The range of Dpo≤Ds≤Da.

17 shows an experimental graph comparing the performance of a conventional ferrite magnet and the electrodeless lighting device using the magnet 230 including aluminum, nickel, and cobalt according to an embodiment of the present invention.

Comparing the amount of light (unit: lm), which is an important performance in the lighting device, the light quantity hardly changes even if the lighting device using the magnet 230 according to the present invention is kept on, whereas the lighting device using the conventional magnet has a time. It can be seen that the amount of light rapidly decreases as time passes. This difference shows that the performance is unparalleled in view of reliability as a lighting device.

On the other hand, as shown in Figure 12 and 13, the insertion or partial insertion of the magnet 230 in the heat dissipation member (240, 241) is important.

In order for the magnetron unit 200 according to an embodiment of the present invention to exhibit its performance, the magnetic field value should be close to about 1900 gauss. In order to do so, the gap between the anode cylinder 290 and the magnet 230 should be very small. do.

In addition, the magnetron unit 200 according to an embodiment of the present invention may be applied to an electrodeless lighting device, preferably an electrodeless lighting device for a street lamp, but is not limited thereto and may be applied to various fields such as a microwave oven. Can be.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

As described above, the present invention provides a magnetron unit in which performance is not degraded even when the temperature of the magnet is increased by using a magnet containing a component having excellent thermal performance.

In addition, the present invention provides a magnetron unit having excellent temperature characteristics, preserving voltage and power, and improving reliability by constructing a magnetic circuit using a magnet including aluminum, nickel, and cobalt having excellent thermal performance.

In addition, by using the magnetron unit according to the present invention, there is no phenomenon of darkening or flickering even when used for a long time, and the amount of light is not reduced and the light efficiency is excellent.

Claims (14)

An anode cylinder in which electrons are emitted; Pole pieces installed at both ends of the anode cylinder to collect magnetic energy; A magnet installed in parallel with a side of the anode cylinder; A yoke installed at both ends of the magnet to support the magnet and to form a magnetic circuit between the anode cylinder and the magnet; And And a spacer disposed between the yoke and the pole piece. The method of claim 1, The magnet is a magnetron unit, characterized in that it comprises at least one of aluminum, nickel or cobalt. delete The method of claim 1, The magnet is characterized in that the magnetron unit is disposed symmetrically with respect to the longitudinal center line of the anode cylinder. The method of claim 4, wherein The magnet is magnetron unit, characterized in that spaced apart from the anode cylinder. The method of claim 1, The yoke is made of an upper yoke and a lower yoke, the magnetron unit further comprises a fastening member for coupling the upper yoke and the lower yoke. The method of claim 1, Magnetron unit, characterized in that the sealing member is formed between the spacer and the pole piece. An anode cylinder in which electrons are emitted; Pole pieces installed at both ends of the anode cylinder and having a central portion protruding therefrom; A cylindrical magnet installed parallel to both sides of the anode cylinder in a longitudinal direction thereof; Yokes respectively provided at both ends of the magnet to support the magnet; A cylindrical spacer disposed between the yoke and the pole piece; And And a heat dissipation member surrounding the anode cylinder to protrude heat generated by the anode cylinder, the heat dissipation member having an extension protruding toward one side of the magnet. The method of claim 8, The heat dissipation member, the magnetron unit, characterized in that a hole for inserting the anode cylinder and the magnet is formed. The method of claim 8, The yoke is a magnetron unit, characterized in that the width is larger than the diameter of the magnet and smaller than the diameter of the anode cylinder. The method of claim 8, The pole piece, the magnetron unit characterized in that it comprises a protruding center portion and the edge portion extending radially from the edge of the center portion. The method of claim 11, A magnetron unit is characterized in that the diameter of the magnet is larger than the inner diameter of the edge portion of the pole piece and smaller than the diameter of the anode cylinder. The method of claim 11, The diameter of the spacer is greater than the outer diameter of the edge portion of the pole piece magnetron unit, characterized in that smaller than the diameter of the anode cylinder. The method according to any one of claims 8 to 13, The magnet, the magnetron unit, characterized in that at least one of aluminum, nickel or cobalt.

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