CN1413167A - 在离子风设备中减少臭氧产物的方法和装置 - Google Patents

在离子风设备中减少臭氧产物的方法和装置 Download PDF

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CN1413167A
CN1413167A CN00817723A CN00817723A CN1413167A CN 1413167 A CN1413167 A CN 1413167A CN 00817723 A CN00817723 A CN 00817723A CN 00817723 A CN00817723 A CN 00817723A CN 1413167 A CN1413167 A CN 1413167A
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吉姆·L·李
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Summer Beat Image Acquisition LLC
Teserra
Sharper Image Corp
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    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
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Abstract

一种在离子风设备中限制臭氧产物的方法，通过在时间上以产生气流的波形效应改变跨发射器阵列(10)和收集器(20)上的高压电位，可以在这样的设备中实现高加速度的事件的同时限制臭氧产物。通过切换、锯齿或选通方法将高压电位向该阵列馈给可以实现该变化。

Description

在离子风设备中减少臭氧产物的方法和装置
技术领域
本发明一般涉及离子发生器和离子风设备，特别涉及一种在离子风设备中用于减少臭氧产物的改进方法和装置。
背景技术
在诸如美国专利4,789,801(这里结合作为参考)所描述的离子风之类的设备提供加速的气体离子，该气体离子通过使用在一个或多个发射器和多个收集器(加速器)之间的差动高压电场而产生的。向周围的大量气体中带入离子而造成气体流动。然而，用于产生气体离子并提供气体加速的必要推力的高压电场也产生分子分解反应，该反应中的最普通的反应是当该设备工作在可呼吸的大气中时由氧气中产生臭氧。本发明的目的是提供在这种设备中减少臭氧产物的方法。
美国食品和药物管理局已经确定室内空气中的臭氧在浓度超过50ppb(10亿分率)时可能会对人造成损害。NIOSH也规定臭氧的室内浓度超过100ppb时可能会对人造成损害。使用高压电场以产生大气的等离子体电晕放电和空气离子的设备都易于产生该同素异形体，即臭氧。在大多数直流工作的离子风系统中，在高压电场的电压及电流和臭氧浓度的水平之间有一个线性的关系。而且在电场的加速度和强度之间存在一个线性关系。一般地说电压越高、加速度越大。由于要求具有最大的加速度，必须采用一种方法以限制或减少不需要的臭氧产物。
发明内容
离子风设备通过在一个或多个发射器和多个收集器(加速器)之间施加差动高压电场可以加速气体离子。本发明的方法，通过以产生气流的“波形效应”的方式在时间上改变跨发射器阵列和收集器之间的高压电位，在这样的设备中实现高加速度，同时限制臭氧产物。已经证明了有几种可选择的改变高压电位的方法可以成功地实现种波形效应。一种方法，其可以被称作为切换方法，它让正发射器高压电位在一段时间内(例如3秒)工作在降低的电平上(例如+6KV)，然后在另外的时段上(优选地为较短的时间间期(例如1秒))切换到较高的电位上(例如+8.5KV)。结果是同时降低到较低的气流(较少的臭氧发生水平)。然而，当从较低的电位向较高的电位切换持续一秒时，由于加速了的离子动量可以即刻到达较高的气流量。由于离子动量转移以及离子惯性整个平均气流稍微高于上述线性流量的三至一倍。
一种可选择的方法，它可以被称作为锯齿方法，通过使用电子电路来完成波形效果以产生非线性的锯齿波驱动电压。典型的锯齿波宽度可能也是例如4秒，它具有尾部，和大约1秒的影响最高电压状态的下降沿。在切换方法和斜率方法中，气流的速度一般是从每分钟300英尺的低速度状态向每分钟500英尺的高速度状态变化。随后的臭氧产物水平从3秒的17ppb向少于1秒的50ppb的高水平变化。总平均臭氧产物少于25ppb。这表示对同样的阵列在每秒350英尺的稳态下产生平均35ppb臭氧的运行时的一个改进。此外，每秒500英尺的气流冲出明显地改进了离子风设备的运转。
下一个可选择的也产生波形效应的方法可以被称作选通方法，它是在定时的间隔上切换把正高压到发射器或把负高压切换到收集器(或同时切换正、负高压)的选通电压，例如20秒关闭，然后20秒在高压状态。最终，切换方法，不论是锯齿方法还是选通方法都可以互相协同使用或与其他臭氧控制方法一起使用。
附图说明
图1是离子风设备的发射器和收集器(加速器)阵列的示意图；
图2是本发明的在发射器和收集器之间改变高压电位的切换方法的示意图；
图3是本发明的锯齿方法的示意图；以及
图4是本发明的选通方法的示意图。
具体实施方式
图1引用如美国专利4,789,801所描述的典型的离子风阵列。发射器或发射器1通常是由1毫米的纯钨丝构成，并具有任意长度。收集器(有时称作加速器)20通常由非腐蚀性导电材料例如铜、铝、不锈钢或黄铜等构成。该发射器10总是位于收集器对面，并且位于收集器20的空隙的中心(A)。发射器10到收集器20的引导边沿(半径)的等距离(B)可以随所要求的工作效果而变化，但是一般是1英寸。这也是收集器之间的真正间隔(C)。
跨发射器/收集器阵列施加的差值电压必须至少是6,500伏，以便影响任何真正的离子的移动性和随后的气流。典型的配置包括施加一正高压到发射器10，并施加一负高压到收集器20以达到15,000伏的最大直流差值电压。这些差动电位可以翻转。但是，当这种做时，会在发射器源上非稳定的等离子云封层，导致过多的电晕放电噪声和臭氧产物。可选择的是，该阵列可以通过单纯的正或单纯的负高压激励源来驱动发射器10和具有高返地阻抗的(以减少负载电流和击穿电弧)收集器20。该激励电压也可以采用美国专利4,789,801所教导的方法来调制以到达所要求的结果。
图2是本发明的切换方法的示意图。该方法将一脉冲高压提供给发射器/收集器阵列，即一高压激励配置通过从低电平正高压状态HV1在预定的时间间期切换到高电平正高压状态HV2来驱动该阵列，例如1秒钟的HV1和3秒钟的HV2。如果正电压按比例适当地增加，则没有必要包括负电压基准-HV以达到同样的气流水平。电压极性也可以反转而对气流水平具有最小的影响。
图3是本发明的锯齿方法的示意图。该方法将锯齿性的高压提供给发射器/收集器，即高压激励配置使用在可变时间间期上幅度变化的锯齿波电压来驱动该阵列。为得到最小的臭氧产物来说，接通状态的低电平高电压一般可能有5.5秒长。相反地，为了得到最大要求的臭氧，该低电平高电压可短到2.5秒。该锯齿波上升时间典型地在1.5秒产生一个超过14000伏的差值电压。真正的时间和幅度可以根据所要求的气流和臭氧水平的效果来变化。
图4是本发明的选通方法的示意图。该方法将序列高压提供给发射器/收集器阵旬，即将差动高压选通施加(或开关接通/关闭)给该阵列的方法，用该方法时，把施加在该阵列上的差值电压在预定的间隔上从零状态转换到最高状态。该开/关定时的状态和差动幅度可以根据效果来变化。例如，20秒开到20秒关的时间和15000伏的差动高压电平对气流和臭氧输出将是最大的占空比和最高幅度。正如上文所述的切换和锯齿方法，如果发射器阵列上的电压成比例地增加，由于气流和臭氧水平在同样的环境条件将成比例地增加，因此没有绝对必要在收集器阵列上使用负高压。但是，施加给收集器阵列的负高压通常用于改善污物收集、限制电路的成本并减少对位于阵列机箱附近的中性元件的电晕电弧。

Claims (10)

1.一种在离子风设备中减少臭氧产物的方法，所述方法包括下列步骤：
提供一发射器；
提供多个收集器；
将所述收集器与所述发射器等距离地放置以形成一阵列；
在所述发射器和所述收集器之间提供一高压电位；以及
随时间改变所述高压电位以产生气流的波形效果并减少总的臭氧产物。
2.如权利要求1所述的在离子风设备中减少臭氧产物的方法，其中所述随时间改变所述高压电位的步骤包括：所述高压电位从在第一时间段持续的较低的高压电平切换到在第二时间段持续的较高的高压电位。
3.如权利要求2所述的在离子风设备中减少臭氧产物的方法，其中所述较低的高压电平是大约+6KV，并且所述较高的高压电位是大约+8.5KV。
4.如权利要求2所述的在离子风设备中减少臭氧产物的方法，其中所述第一时间段大于所述第二时间段。
5.如权利要求4所述的在离子风设备中减少臭氧产物的方法，其中所述第一时间段是大约3秒，所述第二时间段是大约1秒。
6.如权利要求1所述的在离子风设备中减少臭氧产物的方法，其中所述随时间改变所述高压电位的步骤包括向所述发射器/收集器阵列提供一非线性锯齿驱动电压。
7.如权利要求6所述的在离子风设备中减少臭氧产物的方法，其中所述非线性锯齿驱动电压具有大约4秒的脉冲宽度。
8.如权利要求6所述的在离子风设备中减少臭氧产物的方法，其中所述非线性锯齿电压具有一尾部和影响最高电压状态大约1秒的下降沿。
9.如权利要求1所述的在离子风设备中减少臭氧产物的方法，其中所述随时间改变所述高压电位的步骤包括给所述发射器/收集器阵列提供一选通电压。
10.如权利要求9所述的在离子风设备中减少臭氧产物的方法，其中所述选通电压是在预定的时间间期内从零状态转换到最高状态。
CNB008177236A 1999-12-24 2000-12-22 在离子风设备中减少臭氧产物的方法和装置 Expired - Fee Related CN1264743C (zh)

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CN104456751A (zh) * 2014-11-21 2015-03-25 珠海格力电器股份有限公司 一种离子风发生装置

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CN1264743C (zh) 2006-07-19
EP1255694A4 (en) 2008-06-25
CA2395517C (en) 2009-09-22
CA2395397C (en) 2010-03-23
US20020195951A1 (en) 2002-12-26
CA2395517A1 (en) 2001-07-05
AU2914101A (en) 2001-07-09
AU2914001A (en) 2001-07-09
US6603268B2 (en) 2003-08-05
WO2001048781A1 (en) 2001-07-05
CA2395397A1 (en) 2001-07-05
EP1255694A1 (en) 2002-11-13

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