WO2009092190A1 - 间隙喷气装置 - Google Patents

间隙喷气装置 Download PDF

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Publication number
WO2009092190A1
WO2009092190A1 PCT/CN2008/002048 CN2008002048W WO2009092190A1 WO 2009092190 A1 WO2009092190 A1 WO 2009092190A1 CN 2008002048 W CN2008002048 W CN 2008002048W WO 2009092190 A1 WO2009092190 A1 WO 2009092190A1
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WO
WIPO (PCT)
Prior art keywords
wheel
notch
gas
nozzle
motor
Prior art date
Application number
PCT/CN2008/002048
Other languages
English (en)
French (fr)
Inventor
Jin Lin
Wen He
Ping'an Luo
Xiaoti Yin
Xinmin Liu
Original Assignee
Nuctech Company Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuctech Company Limited filed Critical Nuctech Company Limited
Priority to US12/747,476 priority Critical patent/US8434701B2/en
Priority to DE200811003335 priority patent/DE112008003335B4/de
Publication of WO2009092190A1 publication Critical patent/WO2009092190A1/zh

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N2001/022—Devices for withdrawing samples sampling for security purposes, e.g. contraband, warfare agents
    • G01N2001/024—Devices for withdrawing samples sampling for security purposes, e.g. contraband, warfare agents passengers or luggage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N2001/028—Sampling from a surface, swabbing, vaporising
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8376—Combined

Definitions

  • the present invention relates to a fast jet apparatus, and more particularly to a gap jet apparatus for blowing suspected particles carried in human body clothes. Background technique
  • 1,019, 926, 926 A1 discloses an apparatus for blowing a pedestrian to be inspected by a continuous air flow. Later, people developed equipment for blowing clothes with high-pressure gas jets, and the direction of the jets of the nozzles or the direction of the airflow of the blows was constantly changing, either upwards or downwards. These methods and devices were respectively EP1286151A1, US5915268A1 and US6073499A1. It is disclosed in the patent literature.
  • the present invention is directed to a gap jet device having a high jet velocity and an adjustable jet frequency.
  • the present invention provides a gap jet device including a gas source and a gas line communicating with a gas source, wherein the gap jet device further includes a wheel disc and a motor, and the wheel disc is mounted on a rotating shaft of the motor so as to rotate with the motor shaft Rotating together, wherein the wheel is provided with at least one notch, and when the notch is aligned with the nozzle, gas from the gas line can be ejected through the notch.
  • the frequency of the air jet can be freely adjusted by adjusting the motor rotation speed, thereby improving the frequency of the air jet and improving the suspiciousness carried in the body clothes blown off.
  • Figure la is a schematic structural view of an external gap jet device of the present invention.
  • Figure lb shows a front view of the wheel of Figure la
  • 2a is a schematic structural view of a built-in gap jet device of the present invention.
  • Figure 2b shows a front view of the wheel of Figure 2a.
  • Figures la and lb show a schematic structural view of an external gap jet device of a first embodiment of the present invention.
  • the external gap jet device comprises a gas source 1, a gas line 2, a wheel 5 and a motor 3.
  • One end of the gas line 2 is in communication with the gas source 1, and the other end (i.e., the discharge port of the gas line 2) is connected to the nozzle 4, and the nozzle 4 is opposed to one side of the disk surface of the wheel 5.
  • the wheel 5 is mounted on the shaft of the motor 3 for rotation with the motor shaft.
  • a total air circuit switch solenoid valve 7 (which may also be a pulse control) is provided on the gas line 2.
  • the gas source may be an air pump 1 for supplying a high pressure gas, and the pressure of the high pressure gas is generally 0.2 to 0.8 MPa, preferably about 0.5 MPa.
  • the wheel disc 3 is provided with four slots of the same shape and size, each slot is arcuate, and the center of the arcuate slot is the same as the center of the wheel.
  • the four notches on the wheel 5 are evenly spaced on the wheel 5.
  • the width of the notch is designed to allow the air flow ejected from the nozzle 4 to pass unimpeded.
  • an exposed wheel and motor are referred to herein as an external wheel and motor.
  • the air pump 1 is energized and inflated, the solenoid valve 7 is opened, and the motor 3 is energized to drive the wheel 5 to rotate.
  • the notch on the wheel 5 is rotated to be aligned with the nozzle 4
  • the high pressure airflow from the nozzle 4 is discharged. 6 is ejected through the notch on the wheel 5, and when the notch on the reel 5 is rotated so as not to be aligned with the nozzle 4, the high-pressure airflow 6 ejected from the nozzle 4 is blocked by the reel 5 and cannot pass.
  • the wheel 5 is ejected.
  • the high-pressure gas stream 6 ejected from the nozzle 4 is intermittently blocked by the rotating reel 5, thereby generating a pulsed high-pressure gas stream which is jetted at a certain frequency.
  • the airflow hits the clothing worn by pedestrians, making it easier to blow out suspicious particles carried on the human body for system collection, detection and analysis.
  • the frequency f of the jet is .
  • the frequency of the jet is related to the rotational speed ⁇ of the motor and the number ⁇ of the arcuate notches. Therefore, it is possible to increase the jet by increasing the rotational speed ⁇ of the motor or the number ⁇ of the curved notches. The frequency, thus obtaining a high jet frequency.
  • the invention realizes the function of freely adjustable jet nozzle interval time, overcomes the influence of the response time of the common solenoid valve on the jet switching frequency, accelerates the jet frequency of the system, and improves the carrying of the body clothes blown off.
  • the efficiency of suspect particles adopts a mechanical rotating mechanism, has high reliability, overcomes the characteristics that the ordinary electromagnetic valve is repeatedly sucked and easily damaged, and reduces the failure rate of the entire system.
  • the built-in gap jet device comprises a gas source 1, a gas line 2, a wheel 5, a motor 3 and a sealing device 9.
  • One end of the gas line 2 is in communication with the gas source 1, and the other end (i.e., the discharge port of the gas line 2) is in communication with the one side casing 8 of the sealing device 9, and the sealing device 9 is opposed to the discharge port of the gas line 2
  • a nozzle 4 is mounted on the one side casing 8.
  • the wheel 5 is mounted on the shaft of the motor 3 for rotation with the motor shaft.
  • the wheel 5 and the motor 3 are disposed in the sealing device 9.
  • a total airway switch solenoid valve 7 (which may also be a pulse-controlled switch) is provided on the gas line 2.
  • the gas source may be an air pump 1 for supplying a high pressure gas, and the pressure of the high pressure gas is generally 0.2 to 0.8 MPa, preferably about 0.5 MPa.
  • the wheel 4 is provided with a circular arc-shaped notch, and the center and the round of the circular-shaped notch The center of the disc is the same. Further, the width of the notch is designed to allow the airflow ejected from the discharge port of the gas pipe 2 to pass unimpeded.
  • the air pump 1 is energized and the solenoid valve 7 is opened. If the motor 3 is not energized, the wheel 5 does not rotate. At this time, after a certain period of time, regardless of whether the notch on the wheel 5 is aligned with the nozzle 4, the nozzle 4, ⁇ is ejected every time the equilibrium high pressure P Q is ejected. High pressure airflow 6.
  • the motor 3 is energized to drive the rotation of the wheel 5, when the notch on the wheel 5 is rotated to align with the discharge port (or the nozzle 4) of the gas line 2, the nozzle 4 ejects the first pressure P max (t) gas.
  • the notch on the wheel 5 is rotated so as not to be aligned with the discharge port (or the nozzle 4) of the gas line 2
  • the high-pressure airflow ejected from the discharge port of the gas line 2 is blocked by the wheel 5, and cannot be directly Sprayed from the nozzle 4, but since the wheel 5 is sealed in the sealing device and divides the internal space of the sealing device into the left space and the right space, the left space and the right space communicate through the notches on the wheel 5, Therefore, the high-pressure airflow in the left space can still flow into the right space through the notch, and is ejected through the nozzle 4, except that the airflow is disturbed by the high-speed rotating roulette 5, so that the gas pressure ejected from the nozzle 4 at this time (the first)
  • the solenoid valve 7 can be controlled to open, the state of the device is reset, and then the solenoid valve 7 is opened, so that The state of the device enters the next disturbance cycle.
  • the sealing device 9 is designed to isolate the air flow on both sides of the rotating disk, and its function is to widen the pressure difference between P max (t) and P min (t).
  • the number of slots on the wheel disc in the above embodiment may also be two, three or more.
  • both the motor and the disc are disposed in the sealing device, but it is also possible to provide only the disc in the sealing device.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

间隙喷气装置 技术领域
本发明涉及一种快速喷气设备，特别是一种用于吹落人体衣物中携带的可疑微粒 的间隙喷气装置。 背景技术
随着 IMS技术的发展， 对行人携带的毒品、 爆炸物等可疑微粒检测成为可能。 在利用 IMS技术对行人进行毒品、爆炸物监测时， 首先可以利用该快速喷气设备吹落 行人身上携带的毒品、 爆炸物等可疑微粒， 然后再吸入 IMS系统， 进行测量、 分析。 最近几年， 国外专家对门式行人检查技术进行了很多研究， 并申请了多项专利， 如： EP1286151A1 , US5915268A1 , US6073499A1及 US2001049926A1等等。 在这些专利 中， 为了把人体衣物中携带的可疑微粒吹落下来， 想了许多办法。 美国专利文献 US2001049926A1 公开了一种用连续气流吹被检查的行人的设备。 后来， 人们又开发 了用高压气体喷头来吹打衣物的设备， 并且喷头喷气的方向或吹气的气流方向也不断 变化， 或向上方， 或向下方， 这些方法和设备分别被 EP1286151A1 , US5915268A1 和 US6073499A1等专利文献所公开。
在现有的采用喷头喷高压气体的 IMS设备中， 都采用普通电磁阀来控制气路的 通和断， 囟此喷气的频率受到限制， 通断的周期很难小于 80ms (通 40ms， 断 40ms) 。 发明内容
因此， 本发明旨在提供一种喷气频率高且喷气频率可调的间隙喷气装置。
为了实现上述目的， 本发明提供一种间隙喷气装置， 包括气源和与气源连通的气 管路， 其中， 间隙喷气装置还包括轮盘和电机， 轮盘安装在电机的转轴上以便随电机 转轴一起旋转， 其中， 轮盘上设置有至少一个槽口， 当槽口与喷嘴对准时， 来自气管 路的气体能够通过槽口喷出。
与现有技术相比， 由于本发明釆用了电机驱动的轮盘结构， 因此可以通过调节电 机转速来自由地调节喷气的频率， 因此能够提高喷气的频率， 改善吹落人体衣物中携 带的可疑微粒的效果。 附图说明
图 la是本发明的外置式间隙喷气装置的结构示意图；
图 lb显示图 la的轮盘的主视图；
图 2a是本发明的内置式间隙喷气装置的结构示意图；
图 2b显示图 2a的轮盘的主视图。 具体实施方式
【第一实施例】
图 la和图 lb显示本发明的第一实施实例的外置式间隙喷气装置的结构示意图。 如图 la所示， 该外置式间隙喷气装置包括气源 1、 气管路 2、 轮盘 5和电机 3。 气管路 2的一端与气源 1连通， 另一端 （即气管路 2的排出口） 与喷嘴 4连接， 喷嘴 4 与轮盘 5的一侧盘面相对。轮盘 5安装在电机 3的转轴上以便随电机转轴一起旋转。
另外， 在气管路 2上设置有总气路开关电磁阀 7 (也可以是脉冲控制的幵关）。 另外， 气源可以为气泵 1 , 用于提供高压气体， 高压气体的压力一般为 0.2~ 0.8MPa, 优选地为 0.5 MPa左右。
如图 lb所示， 轮盘 3上设置有四个形状、 大小相同的槽口， 每个槽口都是圆弧 形的， 并且圆弧形槽口的圆心与轮盘的中心相同。 轮盘 5上的四个槽口均匀地间隔分 布在轮盘 5上。另外，槽口的宽度被设计成能够让喷嘴 4喷出的气流毫无阻挡地通过。
如图 la所示， 由于轮盘和电机是直接外露的， 并没有用密封装置密封， 因此在 本文中将这种外露地设置的轮盘和电机称为外置式轮盘和电机。
下面参照图 la来说明本发明的第一实施例的工作原理。
如图 la所示， 首先气泵 1通电充气， 电磁阀 7开启， 电机 3通电驱动轮盘 5旋 转， 当轮盘 5上的槽口被旋转到与喷嘴 4对准时， 喷嘴 4喷出的高压气流 6通过轮盘 5上的槽口喷出， 当轮盘 5上的槽口被旋转到不与喷嘴 4对准时， 喷嘴 4喷出的高压 气流 6就会受到轮盘 5的阻挡， 而不能通过轮盘 5喷出。 这样， 由于喷嘴 4喷出的高 压气流 6受到旋转轮盘 5断断续续的阻挡， 从而产生按一定频率喷气的脉冲式高压气 ,流。 该气流打到行人所穿的衣物上， 可以更容易地吹打出人体上所携带的可疑微粒， 以便系统收集、 检测和分析。
如图 la所示，如果电机的旋转速度 ω (弧度 /s)、弧形槽口所对应的圆心角 α (度）、 弧形槽口的数量 η都已知时， 则可计算出每次喷气通过的时间 tl (s)， 和每次喷气断 开的时间 t2 (s)。
πα …
= ( 1 )
1 180ω π(360 - ηα) ( 2 )
2 180ηω
因此， 喷气一次通、 断的周期 Τ为-
„ πα π{360 - ηα) 2π ,。、
T = t + t2 = +—^ J-=— ( 3 )
180» 180 ηω
而， 喷气的频率 f为. ·
/ =— =—— （4 )
Τ 2π 根据上面的计算可以看出， 喷气的频率与电机的旋转速度 ω和弧形槽口的数量 η 相关， 因此， 可以通过增加电机的旋转速度 ω或弧形槽口的数量 η来增加喷气频率， 从而获得高的喷气频率。
同现有技术相比， 本发明实现了喷头喷气间隔时间自由可调的功能， 克服了普通 电磁阀响应时间对喷气通断频率的影响， 加快了系统的喷气频率， 提高了吹落人体衣 物携带可疑微粒的效率。 本发明釆用机械旋转机构， 可靠性较高， 克服了普通电磁阀 反复吸合易损坏的特点， 降低了整个系统的故障率。 - -
【第二实施例】
图 2a和图 2b显示本发明的第二实施例的内置式间隙喷气装置的结构示意图。 如图 2a所示， 该内置式间隙喷气装置包括气源 1、 气管路 2、 轮盘 5、 电机 3和 密封装置 9。 气管路 2的一端与气源 1连通， 另一端 （即气管路 2的排出口） 与密封 装置 9的一侧壳体 8连通， 在与气管路 2的排出口相对的、 密封装置 9的另一侧壳体 8上安装有喷嘴 4。 轮盘 5安装在电机 3的转轴上以便随电机转轴一起旋转。 轮盘 5 和电机 3—起设置在密封装置 9中。
另外， 在气管路 2上设置有总气路开关电磁阀 7 (也可以是脉冲控制的开关）。 另外， 气源可以为气泵 1， 用于提供高压气体， 高压气体的压力一般为 0.2〜 0.8MPa， 优选地为 0.5 MPa左右。
如图 2b所示， 轮盘 4上设置有一个圆弧形的槽口， 并且圆弧形槽口的圆心与轮 盘的中心相同。 另外， 槽口的宽度被设计成能够让气管路 2的排出口喷出的气流毫无 阻挡地通过。
如图 2a所示， 由于轮盘和电机是设置在密封装置中的， 因此在本文中将这种密 封地设置的轮盘和电机称为内置式轮盘和电机。
下面参照图 2a来说明本发明的第二实施例的工作原理。
如图 2a所示， 首先气泵 1通电充气， 电磁阀 7开启。 如果电机 3不通电， 轮盘 5不旋转， 这时， 经过一定时间后， 不管轮盘 5上的槽口是否与喷嘴 4对准， 喷嘴 4 ,ι Ί每按平衡高气压 PQ喷出的高压气流 6。
如果电机 3通电驱动轮盘 5旋转时，当轮盘 5上的槽口被旋转到与气管路 2的排 出口 （或喷嘴 4) 对准时， 喷嘴 4喷出第一压力 Pmax(t)的气体。 当轮盘 5上的槽口被 旋转到不与气管路 2的排出口 （或喷嘴 4) 对准时， 气管路 2的排出口喷出的高压气 流就会受到轮盘 5的阻挡， 而不能直接从喷嘴 4喷出， 但由于轮盘 5密封在密封装置 内并将密封装置的内部空间分为左侧空间和右侧空间， 左侧空间和右侧空间通过轮盘 5上的槽口连通， 因此左侧空间中的高压气流仍能够通过槽口流入右侧空间， 并经喷 嘴 4喷出， 只是气流受到高速旋转的轮盘 5的扰动， 使得此时从喷嘴 4喷出的气体压 力 （第二气体压力 Pmin(t)) 小于第一压力 Pmax(t)。 并且根据扰动理论， 有如下关系， 0<Pmin(t)<PQ<Pmax(t)。 如果喷气持续时间 t太长， 可能导致 Pmax(t)和 Pmin(t)相互逼近， 这时， 可控制电磁阀 7断开， 使本装置的状态复位， 然后再电磁阀 7开启， 使本装置 的状态进入下一个扰动循环。 显然， 密封装置 9是为了隔离旋转轮盘二边的气流而设 计的， 其作用是拉大 Pmax(t)和 Pmin(t)之间的压力差距。
这样一来， 就可以形成按一定频率喷气的气流打到行人所穿的衣物上，可以更容 易地吹打出人体上所携带的可疑微粒， 以便系统收集、 检测和分析。
【其它可能的变化例】
上述实施例中的轮盘上的槽口的数量还可以为 2、 3个或 5个以上。
在第二实施例中， 电机和轮盘都设置在了密封装置中， 但是， 也可仅将轮盘设置 在密封装置中。
通过阅读本说明书， 这些简单的置换和变化对于本领域的技术人员而言， 是显而 易见的， 因此不在一一列举。 尽管已经示出和描述了本发明的实施例， 对于本领域的普通技术人员而言， 可以 理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行变化， 本发明的范 围由所附权利要求及其等同物限定。

Claims

权 利 要 求
1 . 一种间隙喷气装置， 包括气源和与气源连通的气管路， 其特征在于， 所述间 隙喷气装置还包括轮盘和电机， 所述轮盘安装在电机的转轴上以便随电机转轴一起旋 转， 其中， 所述轮盘上设置有至少一个槽口， 当槽口与喷嘴对准时， 来自气管路的气 体能够通过槽口喷出。
2. 根据权利要求 1所述的间隙喷气装置， 其中所述轮盘和电机是外置的， 所述 喷气管的排出口上安装有喷嘴， 当喷嘴与轮盘上的槽口对准时气体通过槽口喷出， 当 喷嘴与轮盘上的槽口不对准时气体不能喷出。
3. 根据权利要求 2所述的间隙喷气装置， 其中所述槽口是圆弧形的， 并且圆弧 形槽口的圆心与轮盘的中心相同。
4. 根据权利要求 2所述的间隙喷气装置， 其中所述轮盘上设置有两个以上的槽 口， 并且两个以上的槽口均匀地间隔分布。
5. 根据权利要求 4所述的间隙喷气装置， 其中所述轮盘上设置有四个槽口。
6. 根据权利要求 1所述的间隙喷气装置， 其中所述轮盘和电机是内置的， 即所 述轮盘和电机容纳在密封装置中， 所述喷气管的排出口与密封装置的一侧连通， 在与 排出口相对的、 密封装置的另一侧上安装有喷嘴， 当喷嘴与轮盘上的槽口对准时经喷 嘴喷出第一压力气体， 当喷嘴与轮盘上的槽口不对准时经喷嘴喷出不同于第一压力的 第二压力气体。
7. 根据权利要求 6所述的间隙喷气装置， 其中所述槽口是圆弧形的， 并且圆弧 形槽口的圆心与轮盘的中心相同。
8. 根据权利要求 6所述的间隙喷气装置， 其中所述轮盘上设置有一个槽口。
9. 根据权利要求 6所述的间隙喷气装置， 其中所述轮盘上设置有两个以上的槽 口， 并且两个以上的槽口均匀地间隔分布。
10. 根据前述任一项权利要求的间隙喷气装置，其中在所述气管路上设置有总气 路开关电磁阀或脉冲控制的开关。
PCT/CN2008/002048 2007-12-27 2008-12-23 间隙喷气装置 WO2009092190A1 (zh)

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US20100269930A1 (en) 2010-10-28

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