CN103459908B - 二段空气控制阀 - Google Patents

二段空气控制阀 Download PDF

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CN103459908B
CN103459908B CN201280017064.1A CN201280017064A CN103459908B CN 103459908 B CN103459908 B CN 103459908B CN 201280017064 A CN201280017064 A CN 201280017064A CN 103459908 B CN103459908 B CN 103459908B
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CN103459908A (zh
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赵镐英
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KOREA PRESSURE SYSTEM CO Ltd
Korea Pneumatic System Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0433—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being pressure control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
    • F16K51/02—Other details not peculiar to particular types of valves or cut-off apparatus specially adapted for high-vacuum installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0405—Valve members; Fluid interconnections therefor for seat valves, i.e. poppet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/0426—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with fluid-operated pilot valves, i.e. multiple stage valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0431—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the electrical control resulting in an on-off function
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/12—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened
    • F16K1/123—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened with stationary valve member and moving sleeve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/12—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened
    • F16K1/126—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened actuated by fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7761—Electrically actuated valve
    • 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
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Driven Valves (AREA)
  • Multiple-Way Valves (AREA)
  • Safety Valves (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Lift Valve (AREA)

Abstract

本发明涉及一种用于真空移送系统对压缩空气的供给及切断进行控制的空气控制阀。特别是，本发明的控制阀构成为能够执行二段控制。虽然上述二段控制都是采用依靠供给的压缩空气而滑动的活塞驱动方式。但是，第1控制部采用电子控制方式。相反，第2控制部采用空压控制方式。特别是，上述第2控制部利用真空移送系统达到的真空压而运转。依据本发明的控制阀，可以确保运转的稳定性，同时还能够提高能量效率及运转的精确性。

Description

二段空气控制阀
技术领域
本发明涉及一种空气控制阀。特别是，涉及一种用于真空移送系统对压缩空气的供给及切断进行控制的阀门。
背景技术
真空移送系统包括依靠高速供给的压缩空气而运转的真空泵和依靠上述真空泵排气的夹持器，其通过上述真空泵及夹持器内部产生的负压将移送对象夹持后，再依靠机器人装置将其移送到指定的位置。
当然，上述压缩空气需确保适当供给及适时切断，本发明就是涉及对上述动作进行控制的阀门。
上述系统中使用的现有空气控制阀通过随驱动阀门的电子阀开/关而往复工作的活塞而使出口开闭。即，向阀门箱入口供给的压缩空气一部分经由电子阀对通路内的活塞加压，在阀门处于打开的状态下，使其向后方移动，从而将出口打开。在阀门处于关闭的状态下，使其向前方移动，从而将出口关闭。
虽然具有上述结构的空气控制阀一般都用于真空移送系统中，但是，在这里，却存在以下问题。
第一，仅仅只为了压缩空气的供给及切断而使上述电子阀和控制阀工作的上述阀门结构并不适合于单纯、反复的移送操作。因为这种结构不仅会由于频繁的开/关动作而消耗大量的电力，而且还会缩短配件的使用寿命。另外，还会诱发误运转。为此，在这种情况下，如果阀门继续保持打开状态，就不能顺利完成移送操作。同时，还会导致大量的能源浪费。
第二，上述空气控制阀只能依靠电子阀的开/关而运转。因此，例如，当上述电子阀不能正常运转时，就完全无法对系统进行控制。
第三，在真空移送系统中，压缩空气的供给及切断实际上需要根据真空泵或者排气空间的真空度决定。即，当上述真空度达到充分的标准时，空气控制阀需要运转从而切断供给。但是，上述结构的控制阀仅根据电信号运转。因此，这会降低系统运转的精确性。
发明内容
技术课题
本发明就是为解决上述现有空气控制阀存在的问题而研发的。本发明的目的在于，提供一种空气控制阀，其具有二段控制(two-stage control)，且分别根据电信号及空压信号运转，从而确保运转的稳定性，提高能量效率及运转的精确性。
课题解决方法
本发明的空气控制阀包括：
本体，包括形成有贯通一侧入口及另一侧出口的压缩空气通路的圆筒状外壳，插入于上述通路的中间部内壁并在左右通路间提供路径的挡块，附着在上述外壳外面的电子阀；
第1控制部，包括在上述入口和挡块之间移动使上述路径开闭的中空型第1活塞，从上述通路的入口侧经由电子阀后沿第1活塞外面的左侧及右侧延长的第1流路；
第2控制部，包括在上述挡块和出口之间移动使上述出口开闭的中空型第2活塞，从上述通路的出口侧经由外部空压阀后沿第2活塞外面的左侧延长的第2流路。
优选地，上述外壳由包含一侧入口的第1壳体和包含另一侧出口的第2壳体对向结合构成。
另外，优选地，上述挡块由插入于上述第1壳体的第1挡块和插入于上述第2壳体的第2挡块对向结合构成。
发明的效果
依据本发明的空气控制阀是根据电信号及空压信号执行二段运转的阀门。另外，这种阀门实际上用于真空移送系统中，压缩空气的控制需要根据真空泵或者排气空间达到的真空度而决定。因此，与现有的电信号阀门相比，可以确保运转的稳定性。同时，还提高了能量效率及运转的精确性。
附图说明
图1是依据本发明的空气控制阀立体图。
图2是图1的剖面图。
图3是依据本发明对空气控制阀作用进行说明的示意图。
图4是依据本发明对空气控制阀的另一作用进行说明的示意图。
图5是用于本发明空气控制阀的空压阀示例图。
附图标记说明
100.空气控制阀
10.本体           11.外壳
12.挡块           13.电子阀
14.入口           15.出口
16.通路           17.路径
20.第1控制部      21.第1活塞
22.第1流路        23.突出部
30.第2控制部      31.第2活塞
32.第2流路        33.端部
34.通孔           35.支撑突起
36.弹簧           37.突出部
40.空压阀         41.箱
42.隔板           43.阀杆
44.构件           45.空气通路
具体实施方式
通过参照下面的附图说明本发明的实施例的记载，可以对上面阐述的本发明特征及效果有进一步的了解。在图2以下的附图中，附图标记10代表依据本发明的空气控制阀。
参照图1及图2可以看出，本发明的空气控制阀100包括：本体10和第1控制部20及第2控制部30。
上述本体10包括：中空圆筒状外壳11、设置在上述外壳11内部的挡块12、设置在外壳11外部的电子阀13。具体地说，上述外壳11具有贯通一侧入口14及另一侧出口15的压缩空气通路16。在这里，挡块12插入于上述通路16的中间部而安装，从而为通过这种安装区分的左通路16a、右通路16b间提供较窄的路径17。
上述外壳11由包含一侧入口14的第1壳体11a和包含另一侧出口15的第2壳体11b对向结合构成。当然，在其它实施例中，也可以以一体构成。但是，在这种情况下，通路16变深，加工非常困难，而且发生不良情况的可能性大。因此，在本实施例中，上述外壳11由两个部分构成，不仅使加工变得容易，而且可以大大缩减其尺寸及厚度。
另外，上述挡块12由插入于上述第1壳体11a的第1挡块12a和插入于上述第2壳体11b的第2挡块12b对向结合构成。在本实施例中的结构也是为了克服一体构成时加工困难的问题，进一步为了克服外壳11内的挡块12、第1控制部20及第2控制部30等部件的组装及成形困难的问题的结构。
上述电子阀13附着在外壳11外面，其是提供第1控制部20的一部分流路并对该流路进行开闭控制的普通电子阀。
上述第1控制部20包括：设置在外壳11的通路16上能够滑动的中空型第1活塞21；为使上述第1活塞21移动而形成的第1流路22。具体地说，上述第1活塞21设置在左侧通路16a的入口14与第1挡块12a之间，通过左右移动而开闭上述路径17。第1活塞21为中空型，特别是圆筒状，是因为活塞本身不会妨碍压缩空气的流动。
连通左通路16a、右通路16b的路径17形成于上述挡块12的边沿，当上述第1活塞21移动，从而其端部与上述挡块12接触后，上述路径17就被封闭。
上述第1流路22在上述通路16的入口14侧贯通外壳11的第1壳体11a壁，经由电子阀13后沿第1活塞21外面左侧及右侧延长。在这里，“左侧”、“右侧”应当理解为第1活塞21互为相反的移动方向。参照附图可以看出，上述第1活塞21的外面形成有突出部23，在本实施例中，上述左侧及右侧就是以上述突出部23为基准。
上述第2控制部30包括：设置在外壳11的通路16上能够滑动的中空型第2活塞31；为使上述第2活塞31移动而形成的第2流路32。具体地说，上述第2活塞31设置在右侧通路16b的出口15与第2挡块12b之间，通过左右移动而开闭上述出口15。
上述第2活塞31的一侧被封堵，封闭端部33的侧面形成有经由出口15侧的支撑突起35与出口15连通的通孔34。另外，当上述第2活塞31的封闭端部33与出口15侧接触后，上述出口15就被封闭。附图标记36代表的是在上述第2活塞31外部同轴设置而将第2活塞31加压至出口15侧的弹簧。
上述第2流路32从与上述通孔34连通的通路16的出口15侧贯通外壳11的第2壳体11b壁，经由空压阀40后沿第2活塞31外面左侧延长。参照附图可以看出，上述第2活塞31的外面也形成有突出部37，在本实施例中，上述左侧就是以上述突出部37为基准。上述弹簧36的一端对上述突出部37加压，从而第2活塞31的端部33就与出口15侧接触。
具有上述结构的本发明的空气控制阀100用于真空移送系统，其作用就是允许压缩空气向真空泵供给或者将其切断。
参照图3可以看出，如果电子阀13处于打开（ON）状态，向入口14供给的压缩空气经由第1流路22的同时从右侧对第1活塞21加压，使其向左侧滑动。通过这一操作，使路径17打开。因此，压缩空气通过左侧流路16a及路径17后向右侧流路16b流动。然后，上述压缩空气继续流动脱离第2活塞31的通孔34。
脱离上述通孔34的压缩空气遇到支撑突起35的阻挡而后退，同时对第2活塞31施加比弹簧36的支撑力更大的压力，使其向左侧滑动。通过这一操作使出口15打开。在这种状态下，向上述入口14供给的压缩空气依次通过左侧流路16a-路径17-右侧流路16b-通孔34-出口15向真空泵供给。
当上述供给的压缩空气使真空泵运转时，真空泵与夹持器中就会产生真空及产生负压，从而将移送对象吸附住。至此，空压阀40及第2流路32封闭。
参照图4可以看出，当上述真空达到一定的标准时，在其真空压的作用下上述空压阀40打开。这时，通过通孔34的压缩空气经由第2流路32从左侧对第2活塞31加压，使其向右侧滑动。通过这一操作，使第2活塞31的端部33与出口15侧接触。由此，上述出口15封闭。在这种状态下，即使上述电子阀13处于打开（ON）状态，压缩空气的供给也会被切断。当然，如果真空度下降，上述空压阀40及第2流路32封闭，又会重新恢复到图3所示状态。
图3及图4示出了电子阀13处于打开（ON）状态下压缩空气供给和被切断的操作。但是，当电子阀13处于关闭（OFF）状态时，如图2所示，向入口14供给的压缩空气经由第1流路22的同时从左侧对第1活塞21加压，使其向右侧滑动。通过这一操作，使路径17封闭。由此，压缩空气的供给从根本上被切断。
图5是用于本实施例的上述空压阀40的一个实例。上述空压阀40包括：在箱41的内部被弹性支撑，并在真空压作用下上下移动的隔板42；一端与上述隔板42结合，另一端向下部延长的阀杆43；具有通过随上述隔板42的移动而上下滑动的阀杆43而开闭的空气通路45的构件44。当然，上述空气通路45构成第2流路32的一部分。
例如，如果上述真空泵内未形成真空时，在弹簧压力作用下，上述阀杆42就会堵住空气通路44而使其封闭。图3显示的就是这种这种状态。如上所述，在这种状态下，压缩空气继续流动并向真空泵供给。然后，如果形成真空，在真空压作用下，隔板42及阀杆43上升，同时使空气通路44及第2流路32打开。图4显示的就是这种状态。如上所述，在这种状态下，压缩空气的供给被切断。
上述空压阀40适合用于本发明中。但是，本发明并局限于上述空压阀的具体结构，在其它实施例中，完全可以对设计进行修改。
如上所述，依据本发明的空气控制阀100，压缩空气执行包含第1控制部20及第2控制部30在内的二段控制，特别是，在第1阶段执行电信号控制，且在第2阶段执行空压信号控制。因此，可以确保运转的稳定性和精确性，并且具有良好的能量效率。

Claims (8)

1.一种二段空气控制阀，其特征在于，包括：
本体，包括形成有贯通一侧入口及另一侧出口的压缩空气通路的圆筒状外壳，插入于上述通路的中间部内壁并在左右通路间提供路径的挡块，附着在上述外壳外面的电子阀；
第1控制部，包括在上述入口和挡块之间移动使上述路径开闭的中空型第1活塞，从上述通路入口侧经由电子阀后沿第1活塞外面的左侧及右侧延长的第1流路；
第2控制部，包括在上述挡块和出口之间移动使上述出口开闭的中空型第2活塞，从上述通路出口侧经由外部空压阀后沿第2活塞外面的左侧延长的第2流路。
2.根据权利要求1所述的二段空气控制阀，其特征在于：
上述外壳由包含一侧入口的第1壳体和包含另一侧出口的第2壳体对向结合构成。
3.根据权利要求2所述的二段空气控制阀，其特征在于：
上述挡块由插入于上述第1壳体的第1挡块和插入于上述第2壳体的第2挡块对向结合构成。
4.根据权利要求1所述的二段空气控制阀，其特征在于：
上述路径形成于上述挡块的边沿，当上述第1活塞移动，从而其端部与上述挡块接触后，上述路径就被封闭。
5.根据权利要求1所述的二段空气控制阀，其特征在于：
上述第2活塞一侧被封堵，在封闭端部的侧面形成有经由上述出口侧支撑突起与出口连通的通孔，当上述第2活塞移动至其封闭端部与出口侧接触时，上述出口即被封闭。
6.根据权利要求5所述的二段空气控制阀，其特征在于：
上述第2流路从与上述通孔连通的通路出口侧贯通外壳壁，经由空压阀后沿第2活塞外面左侧延长。
7.根据权利要求1所述的二段空气控制阀，其特征在于：
上述空压阀在真空压的作用下开闭。
8.根据权利要求7所述的二段空气控制阀，其特征在于：
上述空压阀包括：在箱内部以弹性支撑，并在真空压作用下上下移动的隔板；一端与上述隔板结合，另一端向下部延长的阀杆；具有通过上述阀杆的上下移动而开闭的第2流路用空气通路的构件。
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