WO2001009539A1 - Soupape de reglage a ecoulement constant - Google Patents

Soupape de reglage a ecoulement constant Download PDF

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Publication number
WO2001009539A1
WO2001009539A1 PCT/CN2000/000157 CN0000157W WO0109539A1 WO 2001009539 A1 WO2001009539 A1 WO 2001009539A1 CN 0000157 W CN0000157 W CN 0000157W WO 0109539 A1 WO0109539 A1 WO 0109539A1
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WO
WIPO (PCT)
Prior art keywords
valve
sleeve
differential pressure
valve body
constant flow
Prior art date
Application number
PCT/CN2000/000157
Other languages
English (en)
French (fr)
Inventor
Dalin Liu
Original Assignee
Dalin Liu
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 Dalin Liu filed Critical Dalin Liu
Priority to DE10084851A priority Critical patent/DE10084851B3/de
Priority to AU52056/00A priority patent/AU5205600A/en
Priority to US10/031,772 priority patent/US6725880B1/en
Priority to CN00810002.0A priority patent/CN1223781C/zh
Publication of WO2001009539A1 publication Critical patent/WO2001009539A1/zh

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00Control of flow
    • G05D7/01Control of flow without auxiliary power
    • G05D7/0126Control of flow without auxiliary power the sensing element being a piston or plunger associated with one or more springs
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7781With separate connected fluid reactor surface
    • Y10T137/7784Responsive to change in rate of fluid flow
    • Y10T137/7787Expansible chamber subject to differential pressures
    • Y10T137/7788Pressures across fixed choke
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/8158With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225Position or extent of motion indicator

Definitions

  • the invention relates to a constant flow regulating valve with constant flow characteristics for fluid regulation and automatic control. Background technique
  • the valve includes a main valve body, a sub-gang body, a snail butterfly valve, a double-seat disc (automatic spool) and a differential pressure sensor composed of a diaphragm, a spring, and a diaphragm box.
  • This kind of valve can keep the fluid flow rate from being affected by pressure changes within a certain range, but the valve body needs to be designed with a fluid passage that matches the double seat valve disc.
  • the structure is more complicated and the volume is relatively large. Although it has a certain constant flow rate Characteristics, but it has a small adjustment range and poor adjustment performance, making it difficult to install electric and pneumatic valve actuators. Summary of the invention
  • the purpose of the present invention is to overcome the shortcomings of the prior art, and provide a constant flow regulating valve with a compact structure, a small volume, a low manufacturing cost, a good constant flow characteristic, and excellent regulating performance.
  • a constant flow regulating valve with a compact structure, a small volume, a low manufacturing cost, a good constant flow characteristic, and excellent regulating performance.
  • the invention provides a constant flow regulating valve, which includes a valve body.
  • the valve body is provided with an upper cover and a lower cover.
  • the center of the upper cover is provided with a valve shaft, a sealing packing, a sealing roller, and a valve executing device.
  • the cam disc, the outer circle of the end cam disc is matched with the inner hole of the cavity in the valve body, and is opposite to the orifice on the valve body.
  • the lower part of the valve shaft is also connected to the fixed end of the differential pressure sensor.
  • the movable end of the lower part of the susceptor is connected with the sleeve type double seat valve disc.
  • the outer circle of the sleeve type double seat valve disc is matched with the two concentric valve seat holes in the lower part of the valve body, and the upper part of the valve body outlet and the valve body upper cavity.
  • a communication hole is provided between the lower part of the valve shaft, the top of the end-face cam disc and the fixed end of the differential pressure sensor at the same position, and they are concentric and have the same diameter to form another communication hole.
  • a communication hole communicates the outlet of the valve body with the inside of the differential pressure sensor.
  • the constant flow regulating valve includes a valve body.
  • the valve body is provided with an upper cover and a lower cover.
  • the center of the upper cover is provided with a valve shaft, a sealing packing, a sealing roller, and a valve actuator.
  • An end surface is provided at the lower part of the valve shaft.
  • the cam disc, the outer circle of the end cam disc is matched with the inner hole of the cavity in the valve body, and is opposite to the orifice on the valve body.
  • the lower part of the valve shaft is also connected to the fixed end of the differential pressure sensor.
  • the movable end of the lower part of the susceptor is connected with the sleeve type double seat valve disc.
  • the outer circle of the sleeve type double seat valve disc is matched with the two concentric valve seat holes in the lower part of the valve body, and the upper part of the valve body outlet and the valve body upper cavity.
  • a communication hole is provided between the lower part of the valve shaft, the top of the end cam disc and the fixed end of the differential pressure sensor at the same position, and they are concentric and have the same diameter to form another communication hole.
  • a communication hole communicates the outlet of the valve body with the inside of the differential pressure sensor.
  • the upper part of the end-face cam disc is a connecting sleeve, which is connected to the lower part of the valve shaft.
  • a sealing ring groove is arranged on the outer side of the ring groove, and a sealing ring is arranged in the ring groove.
  • the lower part of the end-face cam disc is a helical end with a lower end
  • the cam-shaped sleeve is provided with a through hole at the upper end surface.
  • the main body of the sleeve type silent seat valve disc is a cup-shaped sleeve with an upper end closed, and two annular convex wide flaps are provided on the outer side of the lower part of the sleeve, and 3-6 are evenly distributed on the outer side of the sleeve.
  • the guide fins parallel to the center line of the sleeve are uniformly provided with 3-6 through holes on the upper side of the sleeve, and a protrusion on the upper end of the sleeve is matched with the through hole of the upper end surface of the helical end cam-shaped sleeve.
  • the differential pressure sensor is selected from a bellows, a rubber diaphragm or a sliding piston.
  • the valve actuator is a manual, electric or pneumatic valve actuator.
  • the valve actuator is provided with a pointer and a locking screw, an upper surface of the upper cover is provided with a scale, and the indication on the scale indicated by the pointer is the value of the flow rate passed by the valve.
  • the core of the valve shaft is provided with an adjusting screw, the lower part of the adjusting screw is pressed against the pressure plate, the lower part of the pressure plate is provided with a spring, and the lower part of the spring is pressed against the inner bottom of the differential pressure sensor.
  • the constant flow regulating valve When the constant flow regulating valve is in use, first turn a valve actuator, such as a hand wheel, to cause the valve shaft and the end cam type disc to rotate. At this time, the pointer on the hand wheel points to the scale showing the flow value. After pointing to the required flow value, tighten the locking screw on the handwheel to lock the handwheel. This completes the setting of the constant flow regulating valve. Thereafter, when the pressure of the constant flow regulating valve changes before and after, the differential pressure sensor drives the sleeve-type double-seat valve flap to move up and down to compensate for the change in flow caused by the pressure change, so as to keep the required flow constant. Electric or pneumatic constant flow regulating valves are adjusted by electric or pneumatic valve actuators instead of hand-wheel driven valve shafts. When used in automatic control systems, the valve actuators do not have to be activated frequently due to pressure changes, which can improve the system. Stability, extend the service life of electric or pneumatic valve actuators. BRIEF DESCRIPTION OF THE DRAW
  • FIG. 1 is a schematic structural diagram of an embodiment of the present invention
  • FIG. 2 is a view from C in FIG. 1;
  • FIG. 3 is a cross-sectional view taken along AA in FIG. 1;
  • Fig. 4 is a sectional view taken along the line B-B in Fig. 1. Best Mode of the Invention
  • Embodiment 1 A constant flow regulating valve for fluid regulation and automatic control, comprising a valve body (1), the valve body is provided with an upper cover (7), a lower cover (32), and a valve body (9) in a wide body. ), End cam valve disc (4), differential pressure sensor (5) and sleeve type double seat valve disc (3), the upper cover is pressed through the upper cover by the sealing pressure (14) and the sealing packing (8). (7) of the valve shaft
  • valve shaft (9) is connected to the handwheel (11) via the key (12).
  • the hand wheel (11) is provided with a pointer (15) and a locking screw (10).
  • the pointer (15) points to the dial (16) on the upper cover (7), and displays the flow setting value passed by the valve.
  • the lower part of the valve shaft (9) is connected to the end cam cam disc (4) through a connecting sleeve (6).
  • the end cam cam disc (4) is a sleeve with a cam-shaped end surface at the lower end, and a square through the center of the upper end surface.
  • the hole (33), the outer circle of which fits with the inner hole of the middle cavity of the valve body, and one side of its outer circle corresponds to the throttle hole (24) to form a flow regulating system of the valve.
  • a sealing ring groove is provided on the outer side of the connecting sleeve (6), and a sealing ring (22) is installed therein.
  • the outer circle of the connecting sleeve (6) is closely matched with the inner circle of the upper cavity of the body.
  • the lower part of the valve shaft (9) is connected to the fixed end of the differential pressure sensor (5) by a fastener, and the movable end of the lower part of the differential pressure sensor (5) is connected to the sleeve type double seat valve disc (3) by screws.
  • the main body of the sleeve type double seat valve disc is a cup-shaped sleeve with an upper end closed, and a square protrusion (34) is arranged at the center of the upper end of the sleeve, which cooperates with the square through hole (33), and the square protrusion (34) has a mounting screw in the center.
  • Holes, two annular convex valve discs (28, 30) are arranged on the outside of the sleeve, and the two valve discs respectively correspond to two concentric valve seat holes in the center of the valve body (1).
  • Four guide fins (29) parallel to the center line of the sleeve are also provided on the outside of the sleeve, as shown in FIG.
  • the seat disc (3) moves smoothly up and down in the seat.
  • the role of the sleeve-type double-seat disc (3) is to compensate for flow changes caused by pressure changes.
  • the differential pressure sensor (5) is composed of a metal bellows and its mounting parts.
  • the communication hole (17) communicates with the through hole on the valve shaft (9), the lower connecting sleeve (6) and the fixed end of the differential pressure sensor (5), so that the inner side (21) of the differential pressure sensor (5) and The upper cavity (18) communicates.
  • valve shaft (9) drives the end cam type disc (4) to rotate, it also carries the differential pressure sensor (5) and the sleeve type double seat disc (3) to rotate together.
  • the sleeve type double seat valve disc (3) rotates, its guide fins also have a cleaning function to prevent debris in the fluid from getting caught in the gap between the guide fins (29) and the valve port, thereby ensuring the sleeve type double
  • the flexibility of the seat valve flap to move up and down guarantees the sensitivity of its pressure compensation.
  • An adjustment rod (13) is provided at the core of the valve shaft (9), the lower end of which is pressed against the pressure plate (19), the pressure plate is pressed against the upper end of the spring (20), and the lower end of the spring (20) is pressed at a difference On the movable end inside the pressure sensor (5). Rotate the adjustment lever (13), by adjusting the spring
  • the fluid that enters the valve inlet cavity (2) in the direction of the horizontal arrow on the left side of the figure is divided into two parts by the outer side of the sleeve-type double-seat disc (3), which respectively pass through the upper and lower two
  • the disc (28, 30) reaches the middle cavity (26) and the lower cavity (31) of the valve, and the part to the lower cavity passes through the hollow channel of the sleeve type double seat disc (3) and the upper through hole (27) ) Also reaches the middle cavity (26).
  • the fluid imbalance force acts on the upper and lower valve discs (28, 30) respectively, and is canceled because of the same size and opposite directions, so the sleeve type double seat valve disc (3) is not affected by the imbalance force.
  • the fluid entering the middle cavity 6) reaches the valve outlet cavity (25) through the end cam disc (4) and the orifice (24).
  • the fluid generates three different pressures under the action of the sleeve-type double-seat disc (3) and the end-cam type disc (4).
  • the pressure in the inlet cavity (2) is the highest and is called P1; when the fluid passes through the sleeve-type double-seat disc (3) and reaches the middle cavity (26) and the lower cavity (31), the pressure drops, which is called P2, the differential pressure sensor ( 5)
  • P2 the differential pressure sensor
  • the pressure on the outside is P2; the fluid passes the end cam disc (4) and the orifice (24), and the pressure is the lowest when it reaches the valve outlet (25), which is called P3. This pressure passes through the valve body.
  • the communication hole (23) communicates with the upper cavity of the valve, that is, the inside (21) of the differential pressure sensor (3).
  • P1-P3 the “total differential pressure of the valve”
  • P2-P3 the "throttling differential pressure”. This is also the internal and external differential pressure of the differential pressure sensor (5).
  • the invention has better performance, higher reliability, compact structure, small size, easy processing, reduced manufacturing cost, good constant flow characteristics, and excellent adjustment performance.
  • the opening degree is determined, the pressure before and after When changing over a large working range, the flow through it remains constant, which can be adjusted manually or easily installed with electric or pneumatic valve actuators for automatic adjustment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Fluid-Driven Valves (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Control Of Fluid Pressure (AREA)
  • Safety Valves (AREA)

Description

恒流量调节阀 技术领域
本发明涉及一种用于流体调节和自动控制的具有恒流量特性的 恒流量调节阀。 背景技术
在供热, 空调, 供水、 流体输送等系统中, 为了节约能源需要 均衡合理地输送与分配流体的流量, 保持各个节点所需流量的准确 和稳定, 由于流体的压力与流量的变化会相互影响, 使得各个节点 的流量难以控制准确并保持稳定, 导致流量均衡的输送与分配难以 实现, 进而造成大量能源被浪费。 为此人们发明了许多在流体压力 发生变化时能保持流量不变的设备, 也就是具有恒流量特性的阀门, 其中中国专利 ZL96215731. 7 (公告号 CN2268161 )公开了一种自力 式平衡阀。 该阀包括主阀体, 副岡体, 蜗动蝶阀, 双座阀瓣 (自动 阀芯) 和由膜片, 弹簧, 膜盒组成的差压感受器。 这种阀门能在一 定的范围内保持流体的流量不受压力变化的影响, 但其阀体内需要 设计出配合双座阀瓣的流体通道, 结构比较复杂, 体积比较庞大, 虽然具有一定的恒流量特性, 但它的调节范围较小, 调节性能较差, 不便安装电动、 气动阀门执行器。 本发明概述
本发明的目的是克服现有技术的不足, 提供一种结构筒单紧凑、 体积小、 制造成本较低、 具有良好的恒流量特性、 调节性能优异的 恒流量调节阀, 当它的开度确定后, 它前后的压力在较大的工作范 围内变化时, 通过它的流量保持恒定, 既可手动调节, 也可方便地 安装电动或气动阀门执行器进行自动调节。
本发明提供一种恒流量调节阀, 包括阀体, 阀体上装有上盖和 下盖, 上盖中心装有阀轴、 密封填料、 密封压兰和阀门执行装置, 在阀轴下部装有端面凸轮式阀瓣, 端面凸轮式阀瓣的外圆与阀体中 腔的内孔间隙配合, 并与阀体上的节流孔相对, 阀轴下部还与差压 感受器的固定端连接, 差压感受器下部的活动端连接套筒式双座阀 瓣, 套筒式双座阀瓣的外圆与阀体内下部的两个同心的阀座孔间隙 配合, 在阀体出口的上部与阀体上腔之间设有一个连通孔, 在阀轴 下部、 端面凸轮式阀瓣的顶部和差压感受器固定端的同一位置各设 有一个通孔, 它们同心、 同直径, 从而形成另一个连通孔, 这两个 连通孔使阀体出口处与差压感受器内侧连通。 本发明详述
才艮据本发明, 恒流量调节阀包括阀体, 阀体上装有上盖和下盖, 上盖中心装有阀轴、 密封填料、 密封压兰和阀门执行装置, 在阀轴 下部装有端面凸轮式阀瓣, 端面凸轮式阀瓣的外圓与阀体中腔的内 孔间隙配合, 并与阀体上的节流孔相对, 阀轴下部还与差压感受器 的固定端连接, 差压感受器下部的活动端连接套筒式双座阀瓣, 套 筒式双座阀瓣的外圆与阀体内下部的两个同心的阀座孔间隙配合, 在阀体出口的上部与阀体上腔之间设有一个连通孔 , 在阀轴下部、 端面凸轮式阀瓣的顶部和差压感受器固定端的同一位置各设有一个 通孔, 它们同心、 同直径, 从而形成另一个连通孔, 这两个连通孔 使阀体出口处与差压感受器内侧连通。
所述端面凸轮式阀瓣的上部为一个连接套, 与阀轴下部连接, 其外侧设有一个密封环槽, 环槽内装有一个密封圈, 其外圓与阀体 上腔的内孔紧密配合, 端面凸轮式阀瓣的下部为下端带有螺旋端面 凸轮形状的套筒, 其上端面设有一个通孔。
所述套筒式默座阀瓣的主体为上端封闭的杯形套筒, 在套筒下 部的外侧设有两个环形凸起的阔瓣, 在套筒的外侧还均布有 3-6 个 平行于套筒中心线的导向翅片, 在套筒上部的侧面均布有 3-6 个通 孔, 套筒上端有一个突起, 与螺旋端面凸轮形状套筒的上端面的通 孔相配合。
所述差压感受器选自波纹管、 橡胶膜片或滑动活塞。
所述阀门执行装置是手动、 电动或气动阀门执行器。
所述阀门执行装置上设有指针和锁紧螺钉, 上盖的上表面有刻 度盘, 指针所指刻度盘上的示值为阀门所通过的流量值。
所述阀轴的芯部装有调节螺杆, 调节螺杆的下部顶在压盘上, 压盘下部装有弹簧, 弹簧下部压在差压感受器内侧底部。
所述恒流量调节阀在使用时, 先转动阀门执行器, 例如手轮, 使其带动阀轴和端面凸轮式阀瓣旋转, 此时手轮上的指针指向显示 流量值的刻度盘, 当指针指向所需的流量值后, 将手轮上的锁紧螺 钉拧紧, 锁住手轮, 这样就完成了恒流量调节阀的设定。 此后, 当 恒流量调节阀前后压力发生变化时, 差压感受器带动套筒式双座阀 瓣上下运动, 补偿由压力变化引起的流量变化, 使所需的流量保持 恒定。 电动或气动恒流量调节阀是由电动或气动阀门执行器代替手 轮驱动阀轴进行调节, 它们在自动控制系统中使用时, 可使阀门执 行器不必因压力的变化而频繁启动, 可提高系统的稳定性, 延长电 动或气动阀门执行器的使用寿命。 附图说明
图 1是本发明实施例的结构示意图;
图 2是图 1中的 C向视图; 图 3是图 1中的 A-A剖视图;
图 4是图 1中的 B- B剖视图。 本发明最佳实施方式
实施例 1: 一种用于流体调节和自动控制的恒流量调节阀, 包 括阀体( 1 ), 阀体上装有上盖( 7 ), 下盖( 32 ), 阔体内装有阀轴( 9 )、 端面凸轮式阀瓣(4)、 差压感受器 (5 )和套筒式双座阀瓣(3), 上 盖通过密封压兰 ( 14 )和密封填料( 8 )压紧穿过上盖 ( 7 ) 的阀轴
( 9 ), 阀轴 ( 9 )通过键 ( 12 ) 连接手轮( 11 )。 手轮( 11 ) 上设置 了指针( 15 )和锁紧螺钉( 10 ), 指针( 15 )指向上盖 ( 7 ) 上的刻 度盘(16), 显示阀门通过的流量设定值。
阀轴(9) 下部通过连接套(6) 与端面凸轮式阀瓣(4 )连接, 端面凸轮式阀瓣(4 )是下端带有凸轮形端面的套筒, 其上端面中心 有一个方形通孔(33), 其外圆与阀体中腔的内孔间隙配合, 其外圓 的一侧与节流孔(24 )相对应, 形成阀门的流量调节系统。 当端面 凸轮式阀瓣(4) 沿中心轴线转动时, 其凸轮形端面就改变了节流孔
( 24 ) 的流通面积, 流量随之改变。 这样就可在其转动一圈之内完 成阀门流量调节的全部行程。 具体过程是: 当手轮(11 ) 上的指针
(15 )指在刻度盘(16) 的 0度时, 流量最小, 指在 270度时流量 最大。 从 0度到 270度的范围用于手轮调节, 从 270度到 0度的范 围用于电动或气动阀门执行器调节。 连接套(6) 的外侧设有一个密 封环槽, 其中装有一个密封圈 (22), 其外圆与岡体的上腔内圆紧密 配合。
阀轴(9) 的下部通过紧固件连接差压感受器 ( 5 ) 的固定端, 差压感受器(5) 下部的活动端通过螺钉连接套筒式双座阀瓣(3)。 阀体内设有两个同心的阀座孔, 套筒式双座阀瓣(3) 与这两个阀座 孔间隙配合, 使阀体内划分为进口腔(2), 中腔(26), 下腔(31) 和上腔(18)。 套筒式双座阀瓣的主体为上端封闭的杯形套筒, 在套 筒上端中心有一个方形突起(34), 它与方形通孔(33) 配合, 方形 突起(34) 中心有安装螺孔, 在套筒的外侧设置两个环形凸起的阀 瓣 (28、 30), 这两个阀瓣分别对应于阀体 (1) 中央的两个同心阀 座孔。 在套筒的外侧还设有平行于套筒中心线的 4个导向翅片(29 ), 如图 4 所示, 其作用是在套筒外侧形成进口腔(2), 并引导套筒式 双座阀瓣(3) 在阀座中上下平稳运动。 套筒式双座阀瓣 (3) 的作 用是补偿由压力变化引起的流量变化。
差压感受器(5)用金属波纹管及其安装部件组成。
连通孔( 17 )连通阀轴 ( 9 )上、 及其下部的连接套( 6 )和差 压感受器(5) 的固定端上的通孔, 使差压感受器 (5) 的内侧(21) 与上腔(18)连通。 上腔与出口腔(25)之间也设有连通孔(23), 这两个连通孔将阀门出口腔(25)处的流体压力 P3传递到差压感受 器(5) 的内 j (21)。
当阀轴 (9) 带动端面凸轮式阀瓣 (4) 转动时, 也带着差压感 受器( 5 )以及套筒式双座阀瓣( 3 )一起转动。 套筒式双座阀瓣( 3 ) 的转动时, 其导向翅片还具有清扫作用, 防止流体内的杂物卡在导 向翅片 (29) 与阀口的缝隙中, 从而保证套筒式双座阀瓣上下运动 的灵活性, 即保证其压力补偿的灵敏度。
在阀轴 (9) 芯部设有一个调节杆(13), 其下端顶在压盘(19) 上, 压盘压在弹簧(20) 的上端, 并使弹簧(20) 的下端压在差压 感受器 (5) 内侧的活动端上。 旋转调节杆(13), 可通过调节弹簧
(20)对差压感受器(5) 的活动端的压紧力进行微量调节。
本实施例将阀轴 (9)、 端面凸轮式阀瓣 (4)、 套筒式双座阀瓣
(3)、 差压感受器 (5)、 调节杆(18) 和弹簧(20)组装在同一轴 线上, 结构紧凑合理, 可同时完成流量调节, 压力补偿和微量调节 三大功能。
以下是本实施例的工作原理和过程: 沿图中左侧水平箭头方向 进入阀门进口腔(2) 的流体被套筒式双座阀瓣 (3) 外侧分为两部 分, 分别经过上下两个阀瓣(28、 30)到达阀门的中腔(26) 和下 腔(31), 到下腔的部分再经套筒式双座阀瓣 (3) 中空的通道及其 上部的通孔(27)也到达中腔(26)。 此时流体的不平衡力分别作用 于上下两个阀瓣(28、 30), 因其大小相同, 方向相反而抵消, 因此 套筒式双座阀瓣(3) 不受不平衡力的影响。
进入中腔 6) 的流体经端面凸轮式阀瓣(4) 和节流孔(24) 到达阀门出口腔(25)。 流体在套筒式双座阀瓣 (3) 和端面凸轮式 阀瓣(4) 的作用下, 产生三段不同的压力。 进口腔(2) 的压力最 高, 称为 P1; 流体经过套筒式双座阀瓣 (3)后到达中腔(26) 和 下腔(31) 时压力下降, 称为 P2, 差压感受器 (5) 的外侧所受压 力为 P2; 流体再经过端面凸轮式阀瓣(4)和节流孔(24), 到达阀 门出口 (25) 时压力最低, 称为 P3, 这个压力经过阀体上的连通孔 (23), 与阀门上腔即差压感受器 (3) ό 内侧 (21) 连通。 我们将 (P1-P3)称为"阀门总差压", 将(Ρ2-Ρ3) 称为"节流差压"。 这也 是差压感受器(5) 的内外差压。
当端面凸轮式阀瓣(4)与节流孔(24) 的开度位置不变, 当岡 门总差压突然增大时, 会使流量暂时上升, 同时节流差压也暂时上 升, 这使差压感受器(5)被压缩并带动套筒式双座阀瓣(3)上移, 使流通面积减小并迫使 Ρ2降低, 从而节流差压和流量恢复; 反之, 当阀门总差压减小, 流量会暂时下降, 同时使节流差压暂时减小, 造成差压感受器 (5)膨胀并推动套筒式双座阀瓣(3) 下移, 致使 流通面积增加引起 Ρ2上升, 从而节流差压和流量恢复。 当手柄( 11 ) 或电动, 气动执行器带动阀轴 (9 )转动, 使端面凸轮式阀瓣 (4 ) 与节流孔(23 ) 的开度位置改变后, 也会使节流差压暂时改变, 但 随着差压感受器 (5 )带动套筒式双座阀瓣(3 ) 进行差压补偿, 节 流差压会迅速恢复, 从而在新的流量点上实现恒流, 需要说明的是, 当总差压超过工作范围时, 流量将不能恢复, 这个工作范围约为 0. 02Mpa 至 0. 4Mpa, 总差压在工作范围内时, 流量不随总差压增减 而变化, 只会随端面凸轮式阀瓣(4 )与节流孔(24 ) 的开度大小而 变化, 因此这种阀门称为 "恒流量调节岡"。 本发明的恒流量调节阀, 由于套筒式双座阀瓣的主体为套筒, 其中心的通道自然形成了一个流体通道, 与已有技术相比, 省去了 在阀体上设置专门的流体通道的要求, 使其结构更筒单, 加工更容 易; 又由于套筒外侧设有导向翅片, 也省去了已有技术中双座阀瓣 所需的导向杆和导向孔, 既简化了结构, 也减少了流体中杂物卡住 阀瓣的危险。 因此本发明性能更好, 可靠性更高, 结构筒单紧凑、 体积小、 易加工、 制造成本降低, 具有良好的恒流量特性, 调节性 能优异, 当它的开度确定后, 其前后的压力在较大的工作范围内变 化时, 通过它的流量仍保持恒定, 既可手动调节, 也可方便地安装 电动或气动阀门执行器进行自动调节。

Claims

权 利 要 求
1、 一种恒流量调节阀, 包括阀体, 阀体上装有上盖和下盖, 上 盖中心装有阀轴、 密封填料、 密封压兰和阀门执行装置, 其特征在 于: 在阀轴下部装有端面凸轮式阀瓣, 端面凸轮式阀瓣的外圆与阀 体中腔的内孔间隙配合, 并与阀体上的节流孔相对, 阀轴下部还与 差压感受器的固定端连接, 差压感受器下部的活动端连接套筒式双 座阀瓣, 套筒式双座阀瓣的外圆与阀体内下部的两个同心的阀座^ J 间隙配合, 在阀体出口的上部与阀体上腔之间设有一个连通孔, 在 阀轴下部、 端面凸轮式阀瓣的顶部和差压感受器固定端的同一位置 各设有一个通孔, 它们同心、 同直径, 从而形成另一个连通孔, 这 两个连通孔使阀体出口处与差压感受器内侧连通。
2、 根据权利要求 1所述的恒流量调节阔, 其特征在于所述端面 凸轮式阀瓣的上部为一个连接套, 与阀轴下部连接, 其外侧设有一 个密封环槽, 环槽内装有一个密封圏, 其外圆与阀体上腔的内孔紧 密配合, 端面凸轮式阔瓣的下部为下端带有螺旋端面凸轮形状的套 筒, 其上端面设有一个通孔。
3、 根据权利要求 1所述的恒流量调节阀, 其特征在于所述套筒 式双座阀瓣的主体为上端封闭的杯形套筒, 在套筒下部的外侧设有 两个环形凸起的阀瓣, 在套筒的外侧还均布有 3-6 个平行于套筒中 心线的导向翅片, 在套筒上部的侧面均布有 3-6 个通孔, 套筒上端 有一个突起 , 与螺旋端面凸轮形状套筒的上端面的通孔相配合。
4、 根据权利要求 1所述的恒流量调节阀, 其特征在于所述差压 感受器选自波纹管、 橡胶膜片或滑动活塞。
5、 居权利要求 1所述的恒流量调节阀, 其特征在于所述阀门 执行装置上设有指针和锁紧螺钉, 上盖的上表面有刻度盘, 指针所 指刻度盘上的示值为阀门所通过的流量值。
6、 根据权利要求 1所述的恒流量调节阀, 其特征在于所述阀门 执行装置是手动、 电动或气动阀门执行器。
7、 根据权利要求 1所述的恒流量调节阀, 其特征在于所述阀轴 的芯部装有调节螺杆, 调节螺杆的下部顶在压盘上, 压盘下部装有 弹簧, 弹簧下部压在差压感受器内侧底部。
PCT/CN2000/000157 1999-07-30 2000-06-14 Soupape de reglage a ecoulement constant WO2001009539A1 (fr)

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US10/031,772 US6725880B1 (en) 1999-07-30 2000-06-14 Constant flow control valve
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