JPS5959259A - Nonreflective feeder for supplying very short pulse voltage - Google Patents

Abstract

PURPOSE:To enable to uniformly supply pulse voltage to all of parallel loads, by sequentially increasing the surge impedance of the titled feeder at every junction point of each load so as to satisfy the nonreflective condition of progressive waves. CONSTITUTION:In the optional junction points 9-9' of a plurality of parallel loads connected to feeders 2-2' for distributively supplying very short pulse voltage from a generating power source to said loads, the surge impedances of the feeders are sequentially increased at every junction point in a manner such that the surge impedance Zn of the feeder at a downstream side satisfies the formula : 1/Zn={(1/Zn-1)-(1/Rn)} in relation with the surge impedance Zn-1 of the feeder at an upper stream side and the surge impedance Rn of a load to be connected to said junction point. Thus, the very short pulse voltage can be distributively supplied with the value of voltage uniform to each load, while inhibiting the reflection of the very short pulse voltage at each junction point.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to electrostatic precipitators that perform pulse charging, particle 6; This relates to a bulk feeder that equally distributes voltage to a large number of parallel loads (C) and utilizes the effect effectively.

Generally, a pulse voltage travels on a transmission line at a speed close to the speed of light, that is, 0. It propagates at a speed of about 3 (m/ns),
When the pulse 31Jτ (ns) becomes extremely short and its geometric length λ = 0.3τ (m) becomes about the length of the line L (m) or less, that is, τ, L/0. ．．
3 (ns), the property of propagating along the line as a traveling wave appears. Such a pulse voltage is hereinafter referred to as an ultra-short pulse voltage. In this case, as shown in FIG. 1, a pulse power supply l is connected to a large number of parallel loads 3. 4. When trying to supply pulse voltage to 5..., generally the connection points 6 6', 7-7
', 8-8', ..., irregular partial BIJ reflection of the traveling wave pulse voltage occurs.

As a result, it was not possible to uniformly supply pulse voltage to each load 3, 4, 5, . . . , and it was difficult to utilize the effect effectively.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a non-reflective feeder that can evenly supply pulse voltage to all parallel loads. However.

The present invention achieves this object by increasing the surge impedance of the feeder at each connection point in accordance with that of each load so that the condition of no reflection of traveling waves is satisfied at every connection point.

In other words, in general, the reflection of a traveling wave occurs when the surge impedance changes (increases or decreases) on the transmission line, and at each connection point each time a load is connected to the feeder.

Such a change (reduction) in surge impedance occurs. Therefore, now the nth connection point 9-9' shown in FIG.
When focusing on , the surge impedance on the upstream side of feeder 2.2' is Zn-s, -F- (At II (
If the surge impedance of 1 is Zn, and the load n connected to this connection point is 2/P/SkRn, then
If Zn is selected so that the overall surge impedance Z'n on the downstream side at the connection point 9-9' is equal to the feeder I/beadance Zn-1 on the upstream side, in other words, the If so, no reflections will occur at this connection point. Therefore, in order to satisfy this condition at all connection points,
f! :If the voltage is increased so as to satisfy the equation {2} for each connection point, reflection at the connection point will disappear and the voltage values of the pulse voltages distributed and applied to each load will all be equal.
Becomes Noh.

However, negative 6: When there is a branch feeder that supplies the pulse voltage in a branched manner from the HIc feeder, the above Rn shall take the surge inopedance of the branch feeder.

In this case, it goes without saying that the surge impedance of the branch feeder should match that of the load to prevent reflection.

Surge inopedance R1, R21...Rn of each load
When the values are different, from the condition of equation (2), the surge impedance of the feeder is changed to ZO+ at each connection point 1 to nlc as shown in Fig. 3 so that '/'-$Zn→(3) is satisfied. Zl+ ., Zn-1 should be selected. However, this is the surge inopedance of the main (most second-rate) part of the ZoVi feeder. In addition, when the Z/I/Bidanos of each member 4ii are equal to FEL2R2 and R8-1℃, then Zn-+ = R Zn-2-g Zl-± -1 Z〇-B K Z6 ．． Z1+..., Zn-5 may be selected.

In other words, the novel ultra-short pulse monthly feeder according to the present invention is constructed by setting an arbitrary connection point of a plurality of parallel loads connected to an 8-feeder, and adjusting the surge inopedance Zn of the feeder on the downstream side. The surge impedance of the feeder at the side Zn-1. l/Z for the negative 711 surge inopedance Rn connected to the connection flow point
n = I (1/Zn-+)-(-1/Rn) l
It is characterized by increasing the surge inopedance of the feeder at each connection point, as follows.

In this case, the increase in surge inopedance at the connection point is as follows: (2) The opposing area of the feeder that faces Zl is gradually reduced in pressure as shown in Figs. 2 and 3; (2)
The feeder itself is made of a large number of element feeders (for example, cables, etc.) with equal surge inopedance, and the number is reduced at each connection point. (3) The distance between opposing feeders is reduced stepwise at each connection point. to increase.

(4) Wrapping a magnetic core of ferrite air snow around the feeder and increasing its ductance or number at each connection point, (5) Inserting a dielectric between the feeder conductors and adjusting the dielectric constant at each connection point. This can be done by reducing 1 and so on. 1 coaxial fixed feeder as feeder
(When using a feeder, (1) above can also be achieved by changing the diameter of the feeder.Also, it is not uncommon for one of the lines constituting the feeder to be a grounded structure.

At this time, for the other feeder 9, apply the above fl) to (5).
By implementing this, an increase in surge impedance at the connection point can be easily achieved.

Various embodiments of the novel feeder according to the present invention will be shown below with reference to the drawings.

FIG. 4 is a perspective view of an example in which the novel feeder by Kihatsu EyI/ can be implemented as a pulse 611 of a two-electrode electrostatic precipitator consisting of a corona discharge 4 and a collector II pole.

In the figure, 10.10', 10", . . . 10', 10", . . . 10', 10", . . Extremely nr,
In between, each wooden long linear electrode 11.11', n
",..." - are insulated and fixed at the bottom and arranged in a zigzag pattern. 2 and 2' are feeders according to the present invention.

The center part 12.12' is a J'i'j structure with a /1-right illusion as the center, and the output terminal VC of the pole bar 1 pulse high voltage power supply 1 is connected to H at the center part 12.12'. After distributing the output pulse high voltage to the left and right, it is connected to 11 corona transmission lines consisting of each discharge electrode and the dust collection electrodes on the left and right sides.

The feeder for distributing this pulsed high voltage
3'-14', 13''-14'', . However, one side 2' of the feeder is directly connected to one of the output terminals of the pulsed high voltage power source 1, and is grounded via a conductor 15, and is connected to a group of dust collecting electrodes 10, 10', 10'', . . .
...Cζ distribution feeder 14.14', 14'',・
It is connected via... The other end 2 of the Ushida feeder is connected to the other output terminal of the H/L/S high voltage power supply 1 via an insulating coupling capacitor 16, whereby each corona discharge electrode I! Y11, 11', 1
A negative DC high voltage is supplied to each of the left and right grounded dust collecting electrodes to the left and right grounded dust collecting electrodes, and the dust collecting space 21.2 between them is
1'.

21'', . . ., a DC electric field for dust collection is formed.

There are a total of 21-1-1 corona transmission lines each consisting of each corona discharge electrode and the dust collection poles on its left and right, all of which have the same surge impedance R.

In addition, each distribution feeder 13-14.13'-14',
It is assumed that . The feeder 2.2' is constructed so as to apply surge impedance L to each connection point 1ij sequentially from the central portion 12.12' to the left and right, according to the conditions of the feeder of the present invention as shown in the figure. bl. As a result, the extremely short pulse voltage in the pulse supplied from the ultra-short pulse high-voltage medium power supply 1 is distributed equally to all corona transmission lines.

distributed without reducing its voltage value, corona discharge electrode j
Propagates as a traveling wave high voltage on the transmission line with polarity such that +l', 11.11', 11'', etc. are negative,
It is superimposed on the negative DC voltage already created on the corona discharge electrode γ by the DC power supply 17, to generate a uniform and strong negative corona discharge over the entire length of the corona discharge electrode. The negative ions created by this are collected in the dust collection space 21.2.
1';21", ... across the dust collecting electrode 10-1
0', 10'-10'', . . . , and during that time, it floats in the gas flow and hits the dust particles entering from hand n1f, strongly charging them negatively. Therefore, the dust R
The particles are driven by Coulomb force and collected on each dust collection pole.

FIG. 5 shows how the novel feeder according to the present invention is applied to pulse charging of a one-electrode type electrostatic precipitator consisting of a corona discharge electrode, a third electrode for forming an electric field provided near the corona discharge electrode, and a dust collecting electrode. It is a perspective view of an example. In figure 10.1
o: to'',...ha grounded plate-shaped dust collecting electrode 11
A conductor frame 22, 22' is insulated in the middle.
, 22':... are arranged in parallel with this, and are insulated from above and below via an insulator tube 23 to form one long linear roller f bk N poles 11° 11', 11''. ,...
...are arranged in a zigzag pattern.

And in the vicinity on the left and right of the corona discharge electrode.

A wire or rod shape with a large curvature water diameter that is fixed to the frame 22, 22' above and below so as to sandwich this, and parallel to this, so that corona discharge does not occur.

A non-U-shaped "cona d pole j!r24" is arranged.However, at both ends of the frame, the vertical frame part bends this by 11.Therefore, each corona I father electrode 11 .ll', 11'', ... and 4 on the left and right
1 Corona electrode A24 forms a long corona path. 2゜2' is a new feeder according to the present invention for supplying pulse voltage to these many parallel corona transmission lines, and 2.2' in Fig. 4 and #=! 111=I! 3 have a similar structure (j-). (lj, L, in this example 2, 2' are both directly connected to the output terminal of the ultra-short pulse high voltage power supply 1, and the central part 12.12' is the center, and the left and right transmission lines are 20,1 in total. 1 and a distribution feeder 25 26 which also has a surge impedance R
, 25', 26', 25''-26'',...
- and frame 22.22'.

22'', . . . are connected to the feeder 2.2' as shown in the figure.The feeders 2, 2'
From 2.12', the surge impedance is made to increase at each connection point on the left and right according to equation (5).

Therefore, the pulsed voltage supplied from the pulsed high-voltage power supply I is completely evenly distributed to each corona transmission line while maintaining its voltage value.

On the other hand, the feeder 2.2' is connected with a high resistance 27, and the feeder 2.2' is connected with a damping resistance 19. The other end of the choke coil I8 is connected to the negative polarity output of the grounded DC high voltage power supply 17, so that the frame 22
．． 22', 22'', . . . and non-corona electrodes 24.
Linear corona electrode II, 11', II'',...
The corona transmission line consists of dust collection gAlo-1 on the left and right side.
0'.

10'-10'', so''-xo'', ..., and are at a negative high potential with respect to the dust collection space 21, 21',
A DC electric field for dust collection is formed at 21'', . . . □.

1. /-I Linear corona B electrode 0 on each corona transmission line
．． 11', 11'', . . . when an extremely short pulse voltage is applied with a negative polarity.

A strong and uniform negative corona discharge occurs from the corona discharge electrode to the non-corona discharge electrodes on both sides.

A large amount of negative ions are released, and the total amount of the negative ions (delta) reaches the left and right dust collection electrodes 10-10', 10'-10" across the dust collection space 21.21', 21", . , and travel to . Therefore, from the hand iii + 11111, the gas (?-) enters the gas with a free force (?-K) and hits it, giving it a strong negative charge. Therefore, these dust particles are collected by the action of the Coulomb force. I] and be carried to the highest level, and be collected here.

Ru.

In addition to the above-mentioned two sides, the novel feeder according to the present invention has
+1Iii't; j is provided inside any device that uses pulsed voltage. A parallel corona transmission line, such as a parallel corona transmission line, can be used to distribute and supply a pulsed voltage with equal voltage. Among these devices are an electrostatic precipitator using a double helix discharge electrode, such as the one proposed by the present inventor in another invention "Electrostatic precipitator" (Japanese Patent Publication No. 57-31944), [Particle charge, E
Electrode till for device (Japanese Patent Application Laid-Open No. 56-81142),
r ladle (□:j electric equipment f21J (Unexamined Japanese Patent Publication No. 1983 8115
1).

Particle charging device ``Boxer Charger'' or ``Ozone Generator'' (% Patent Application 1982-021878) that can be proposed in
Needless to say, there are over 100 ozonizer shops that can be proposed.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional feeder for supplying ultra-short pulse voltage, Figs. 2 and 3 are schematic perspective views showing the principle of the present invention, and Fig. 4 is a feeder for supplying ultra-short pulse voltage according to the present invention. FIG. 5 is a perspective view of an example in which the non-reflection type feeder can be applied to pulse charging of a two-electrode electrostatic precipitator, and FIG. Please write down the names of the main elements in Figure 1. 1... Power supply for generating ultra-short pulse high voltage 2.2'.
...Feeder 3, 4.5. n-...Parallel load 6, 6: 7.
7; 8.8', 9.9'---m'M point ZO,
Zl, -, zn+ R1, R2, -, IIn, R-
=・・・・・・Sargyi/Pigns 10.10110″,・・・・Dust collection pole ii, 1
1: 1zlZ... Linear discharge electrode 13,
13; 13", -, 14,14: 14", -,
25, 25: 2S'', -. 26, 26', 26''...Distribution feeder 1t
Ra 16 --- Hachiai Conde/Zuno 17 DC high-voltage power supply engineer 8 --- Choke coil 19 --- Attenuation resistor 21, 2x', 21", ... Dust collection space 22, 2
2: 22″, ...conductor frame 23 ・
A11 tube 24- Jl corona electrode 27-- -high resistance

Claims (1)

[Claims] 1. A feeder for distributing and supplying extremely short pulse voltage from its generating power source to a plurality of loads; 4. The feeder is characterized in that its surge impedance is increased successively at each connection point of the loads. A feeder for supplying ultra-short pulse voltage to places where 2. At any negative 6:j connection point, the surge impedance Zn of the feeder on the downstream side is 5 the surge impedance Zn of the feeder on the upstream side.
1/Zn-((1/Z
n-1) -1/Rn) for each connection point.
6 Increase feeder surge impedance 2
This prevents reflection of the ultra-short pulse voltage at each connection point and distributes and supplies the ultra-short pulse voltage to each member 61j with an equal voltage value. feeder. A patented feeder characterized in that the surge impedance is increased by reducing the lunar surface area of a pair of feeders. 3. The feeder according to claim 1, wherein the feeder is composed of a large number of elementary feeders having the same surge impedance, and the surge impedance is increased by decreasing the number of element feeders. Claim 1. A dielectric material is inserted between the feeder conductors, and the surge impedance is increased by decreasing the dielectric constant of the dielectric material. The feeder described in 2. Claim 1 characterized in that the surge impedance is increased by increasing the distance between the feeder conductors.
, 2κ described in Patent 8, which is characterized in that the surge impedance is increased by increasing the feeder ductance, and pulse charging is performed by superimposing ultra-short pulse high voltage onto a corona discharge electrode that applies DC voltage. A two-electrode electrostatic precipitator consisting of a dust collection electrode and a discharge electrode, which serves as a feeder for distributing ultra-short pulse high voltage to the plurality of corona discharge electrodes from its power source, claims I to 7. A pulse/J type two-electrode electrostatic precipitator characterized by the use of the feeder described above. 9. A three-electrode electrostatic precipitator having a corona discharge electrode, a dust collecting electrode, and a non-corona third electrode insulated near the corona discharge electrode, the former being between the third electrode and the dust collecting electrode. Claims 1 to 7 are described as a feeder that applies a high DC voltage such that the former is negative, and distributes and supplies extremely short pulse height between the corona discharge electrode and the third electrode such that the former is negative. Pulse 6: I-electrode three-electrode type % type % type feeder