WO2009079888A1 - A control ball valve - Google Patents

A control ball valve Download PDF

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Publication number
WO2009079888A1
WO2009079888A1 PCT/CN2008/000106 CN2008000106W WO2009079888A1 WO 2009079888 A1 WO2009079888 A1 WO 2009079888A1 CN 2008000106 W CN2008000106 W CN 2008000106W WO 2009079888 A1 WO2009079888 A1 WO 2009079888A1
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WO
WIPO (PCT)
Prior art keywords
pipe
inner diameter
flow
valve
ball valve
Prior art date
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Ceased
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PCT/CN2008/000106
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English (en)
French (fr)
Inventor
Zhongxi Tan
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Individual
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Individual
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Priority to EP08700656.5A priority Critical patent/EP2226536A4/en
Priority to US12/809,426 priority patent/US20100327205A1/en
Publication of WO2009079888A1 publication Critical patent/WO2009079888A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0663—Packings
    • F16K5/0668—Single packings
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs

Definitions

  • the invention relates to a control ball valve. Background technique
  • the control effect of the control valve on the fluid flow rate can be identified by the flow characteristic curve.
  • the characteristic curve of the flow rate is smooth from 0 to 100%, and there is no inflection point, indicating that the fluid flow rate is uniform and there is no turbulence phenomenon, but the structure of the valve cavity is complicated, and the manufacturing and maintenance costs are high. Not suitable for promotion.
  • U.S. Patent discloses an improved control ball-width structure, as shown in FIG.
  • the ball valve 1' includes a flow passage penetrating the inside of the ball valve, and one end of the flow passage has an inlet end 2' for fluid to flow in, and the inlet end 2' is in communication with the first seal seat pipe 3' and the spherical valve plug 4',
  • a distribution plate 5' is further disposed at the intersection of the inlet passage 2' and the first seal seat conduit 3', and the distribution plate is fixed to the pipe at the intersection by a retaining spring through the hole, the distribution plate cross section
  • the structure is shown in Fig.
  • the distribution plate is a spherical surface with a concave surface.
  • the cross section of the distribution plate has an irregular geometry, and a space for the passage of fluid is left inside.
  • the distribution plate has a sealing function, and the other is another. The important function is to adjust the flow of the fluid by setting the geometry.
  • the control ball valve inlet end 2' has an inner diameter d3, the first seal seat pipe 3' has an inner diameter d2, and the spherical valve core 4' has an inner diameter d1, the three inner diameters being unequal to each other, more importantly due to the entrance of the inlet end 2'
  • the pipe is suddenly narrowed, so that after the fluid enters the flow channel from the water inlet, the inner diameter of the pipe is suddenly reduced, the local resistance is increased, and the pressure loss is increased, so that the turbulent flow of the fluid is large, as shown in FIG.
  • the flow characteristic curve of the control ball valve is characterized in that the horizontal axis is the fluid opening degree and the vertical axis is the flow rate.
  • the characteristic curve of the flow rate is relatively smooth, but the opening degree is 70.
  • % there is an inflection point, and after the inflection point is between 70% and 100%, the characteristic curve of the fluid flow starts to be concave, despite the distribution plate 5' confirmation.
  • the flow rate of the fluid is controlled, but the desired flow characteristic curve is still not obtained, which cannot meet the demand.
  • the ball valve differs from the above structure in that the distribution plate has a different position in the flow path.
  • the valve plate is disposed in the inner cavity of the spherical valve core, but since the design of the water inlet pipe is not changed, there is still a certain drop after the fluid flows into the pipe, so the flow characteristic curve of the ball valve still exists when the opening degree is 70%.
  • the inflection point (as shown in Figure 4) does not provide a smooth flow characteristic curve as shown in Figure 1. Summary of the invention
  • the object of the present invention is to overcome the deficiencies of the prior art and to provide a control ball valve structure which is simple in internal structure and capable of achieving a smooth flow characteristic curve, and solves the technical problem of the inflection point of the prior art ball valve flow characteristic curve.
  • a control ball valve includes a valve body, a flow passage through which a fluid can pass through the ceramic body, and both ends of the flow passage include an inlet end and an outlet end.
  • the inlet end of the flow passage is a conical conduit whose inlet is gradually narrowed.
  • the inlet end of the control ball valve is set as a conical pipe whose inlet is gradually narrowed, the flow velocity of the fluid is gradually reduced at the inlet end, the local resistance is reduced, and the pressure loss is also reduced, when the fluid is from the water inlet of the structure. After entering the flow passage of the valve body cavity, no turbulence will occur, so that the characteristic curve of the fluid flow can be well ensured to achieve a smooth and non-inflection point effect.
  • the flow passage includes a spherical valve tube connected to the outlet end and the inlet end, the inlet end having a narrow end connected to the spherical spool tube, and the outlet end having a connection end connected to the spherical spool tube, the outlet
  • the inner diameter of the connecting end is equal to the inner diameter of the spherical spool pipe and the inner diameter of the narrow end.
  • the flow passage further includes a first seal seat pipe connected between the inlet end and the spherical spool pipe, connected to the ball
  • a second seal seat conduit between the spool tube and the outlet end, the inner diameter of the first seal seat conduit and the inner diameter of the second seal seat conduit being equal to the inner diameter of the spherical spool conduit.
  • a sealing seat is provided on the sealing seat pipe to seal the inlet pipe at the inlet end to prevent fluid from seeping out of the pipe.
  • the outlet end is a conical pipe whose outlet is gradually increased.
  • the fluid can prevent the flow rate from increasing due to the sudden increase in the inner diameter, and further control the turbulence of the outlet fluid.
  • the first seal seat conduit and the second seal seat conduit are symmetrically distributed at both ends of the flow passage.
  • the invention has the following technical effects: Since the inlet end of the ball valve flow passage adopts a tapered conical inlet duct, the flow resistance of the fluid flowing into the valve body cavity is small, and the pressure loss is small, Large turbulence occurs. Compared with the existing ball valve, the ideal fluid flow characteristic curve can be obtained without installing the distribution plate. The curve is smooth and has no inflection point, which meets the requirements for use.
  • the control ball valve has a simple structure and is easy to assemble. Production and maintenance costs are low.
  • Figure 1 is a flow chart of fluid flow characteristics of a prior art seat valve
  • FIG. 2 is a schematic view showing a prior art spherical broad section structure
  • FIG. 3 is a schematic cross-sectional structural view of a prior art distribution plate
  • Figure 5 is a schematic cross-sectional view of the ball valve of the present invention.
  • a control ball valve includes a wide body 1.
  • the valve body 1 includes a valve seat 11.
  • the valve seat 11 is fixedly connected at both ends with an inlet end 2 and an outlet end 5.
  • the valve body 1 is internally connected.
  • the flow passage through which the fluid passes, the center of the valve seat 11 is a spherical valve core, the inside of the valve core is connected with a pipe, and communicates with the pipes on both sides to form a flow passage of the entire valve body, and one end of the flow passage includes an inlet end 2, the inlet end 2 is a conical pipe whose inlet is gradually narrowed.
  • the flow path includes a spherical valve tube 4 and a first sealing seat tube 3 connected in series, and the inlet end 2 has a narrow end 21 connected to the first sealing seat tube 3, the inner diameter of the first sealing seat tube 3 and the spherical valve tube
  • the inner diameter of 4 and the inner diameter of the narrow end 21 are equal, and the other end of the spherical wide core pipe 4 is sequentially connected with a second seal seat pipe 31 and an outlet end 5, which has a second seal seat pipe 31 or a spherical spool pipe a connecting end (when the outlet end is directly connected to the spherical wide core pipe), the inner diameter of the connecting end is equal to the inner diameter of the second sealing seat pipe 31, or when the outlet end is directly connected to the spherical spool pipe 4, the connecting end
  • the inner diameter is equal to the inner diameter of the spherical spool tube 4, that is, the inner diameters of the tubes in the flow passage are equal.
  • the outlet end 5 can be configured as a conical conduit with an increasing outlet.
  • outlet end 5 and the inlet end 2 are symmetrically distributed at both ends of the flow passage
  • first seal seat duct 3 and the second seal seat duct 31 are symmetrically distributed at both ends of the flow passage.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)

Description

一种控制球阀 技术领域
本发明涉及到一种控制球阀。 背景技术
现有技术中， 控制阀对流体流量的控制效果可通过流量特征曲线来识别其优劣， 目 前存在一种控制座阔对流体流量的控制可达到满意的流量特征曲线， 如图 1所示， 从开 度 0到 100%之间该流量的特征曲线很平滑，没有出现拐点，说明流体流速均匀， 没有产 生紊流现象， 但该种座阀内腔结构比较复杂， 制作和维修成本较高，不宜推广。
为使控制阀的结构更加简单，现有技术提供了一种控制球阀，美国专利（US6039304, 公告日为 2000年 3月 21日）揭示了一种改良的控制球阔结构， 如图 2所示， 该球阀 1' 包括有贯穿球阀内部的流道， 流道的一端有供流体流入的入口端 2 '， 该入口端 2' 依次 与第一密封座管道 3' 和球形阀芯 4'连通， 在该专利结构中， 在入口通道 2 ' 与与第一 密封座管道 3 '交接处还设置了配流盘 5'， 通过孔用卡簧将配流盘固定在该交接处的管 道上， 配流盘截面结构如图 3所示， 配流盘是一侧面为凹型的球面， 该配流盘的横截面 具有不规则的几何形状， 内部留有供流体通过的空间， 配流盘除起密封作用外， 其另一 个重要功能是通过设置的几何形状来调节流体的流量。 该控制球阀入口端 2 ' 具有内径 d3，第一密封座管道 3'具有内径 d2，球形阀芯 4'具有内径 dl， 该三个内径互不相等， 更关键的是由于入口端 2' 的入口管道是突然变窄的， 这样导致流体从入水口进入流道 后， 由于管道内径突然缩小，局部阻力增大，压力损失加大，从而使得流体的紊流较大， 如图 4所示为该种控制球阀的流体流量特征曲线图， 其横轴为流体开度， 纵轴为流量， 当在开度 0~70%之间时， 其流量的特征曲线还比较平滑， 但在开度是 70%时， 出现了拐 点，拐点之后在开度 70%~100%之间，该流体流量的特征曲线开始下凹，尽管有配流盘 5' 确 认 本 对该流体的流量进行控制， 但仍得不到期望的流量特征曲线， 无法满足需求。
又有人针对上述专利提出了另一种改进型的球阀，.该球阀与上述结构不同之处在 于： 配流盘在流道中的位置不同。 该配流盘设置于球形阀芯内腔中， 但由于其入水口管 道的设计没有变化， 流体流入管道后仍存在一定的落差， 因此该种球阀的流量特征曲线 在开度为 70%时依然存在拐点（如图 4所示)，无法获得如图 1所示平滑的流量特征曲线。 发明内容
本发明的目的是克服现有技术的缺陷，提供一种内部结构简单且能使流体流量达到 平滑的流量特征曲线的控制球阀结构，解决现有技术的球阀流量特征曲线存在拐点的技 术问题。
为到达以上目的， 本发明采取以下的技术方案： 一种控制球阀， 包括有阀体， 所述 陶体内贯通有可供流体通过的流道， 所述流道两端包括入口端和出口端， 所述流道的入 口端为入口逐渐缩小的圆锥形管道。
由于将控制球阀的入口端设置为入口逐渐缩小的圆锥形管道，这样流体的流速在入 口端是逐渐减小的， 局部的阻力变小， 压力损失也减少， 当流体从这种结构的入水口进 入阀体内腔的流道后， 不会产生紊流， 从而能很好的保证流体流量的特征曲线达到平滑 无拐点的效果。
所述流道包括有与出口端和入口端连接的球形阀芯管道，所述入口端具有与球形阀 芯管道连接的窄端， 出口端具有与球形阀芯管道连接的连接端， 所述出口端的连接端内 径与球形阀芯管道的内径和窄端的内径相等。 这样当流体从圆锥形入口端进入流道后， 由于阀体内流道的内径一致， 流体通过流道局部阻力较小， 落差也小， 从而压力损失更 小， 不会存在流体在入口处或流道内由于管道内径的变化过大而导致紊流产生的现象， 有效的保证了流体流量特征曲线从开度 0到 100%的整个过程达到平滑的效果。
所述流道还包括有连接于入口端和球形阀芯管道之间第一密封座管道， 连接于球 形阀芯管道和出口端之间的第二密封座管道，所述第一密封座管道的内径和第二密封座 管道的内径与球形阀芯管道的内径相等。在密封座管道上设置有密封座， 可在入口端处 对入口管道起到密封作用， 防止流体从管道中渗出。
所述出口端为出口逐渐增大的圆锥形管道。 当流体流出流道时， 由于出口端是逐渐 增大的， 这样流体可避免由于内径突然变大使流速增加， 更进一步控制出水口流体紊流 现象的产生。
所述第一密封座管道和第二密封座管道对称分布在所述流道的两端。
本发明与现有技术相比， 具有如下的技术效果： 由于球阀流道的入口端采用了逐渐 缩小的圆锥形入口管道， 这样使得流入阀体内腔中流体流动阻力小， 压力损失小， 不会 出现大的紊流， 与现有的球阀相比， 不需要安装配流盘就能获得理想的流体流量特征曲 线， 曲线平滑、 无拐点， 符合使用要求； 此种控制球阀结构简单， 装配比较容易， 生产 及维修成本都较低。 附图说明
图 1为现有技术座阀的流体流量特征曲线图；
图 2为现有技术球阔剖面结构示意图；
图 3为现有技术配流盘截面结构示意图；
图 4为现有技术球阀的流体流量特征曲线图；
图 5为本发明球阀剖面结构示意图；
附图标记说明： 1 '、 阀体， 2'、入口端， 3'、第一密封座管道， 4'、球形阀芯管道， 5 '、 配流盘， 1、 阀体， 2、 入口端， 21、 窄端， 3、 第一密封座管道， 31、 第二密封座 管道， 4、 球形阀芯管道， 5、 出口端。 具体实施方式
以下结合附图与具体实施方式对本发明内容做进一步的说明：
实施例
请参阅图 5所示， 一种控制球阀， 包括有阔体 1， 该阀体 1包括阀座 11， 阀座 11 两端固定连接有入口端 2和出口端 5,阀体 1内贯通有供流体通过的流道，阀座 11中央 是球形阀芯， 阀芯内部贯通有管道， 并与两侧的管道连通构成整个阀体的流道， 流道的 一端包括有入口端 2， 该入口端 2为入口逐渐缩小的圆锥形管道。
流道上包括有依次连接的球形阀芯管道 4和第一密封座管道 3， 入口端 2具有与第 一密封座管道 3连接的窄端 21，第一密封座管道 3的内径与球形阀芯管道 4的内径和窄 端 21的内径相等，球形阔芯管道 4的另一端依次连接有第二密封座管道 31和出口端 5， 该出口端 5具有与第二密封座管道 31或球形阀芯管道连接的连接端（当出口端与球形 阔芯管道直接连接时）， 该连接端的内径与第二密封座管道 31 的内径相等，或当出口端 与球形阀芯管道 4直接连接时， 该连接端的内径与球形阀芯管道 4的内径相等， 也就是 说流道内各管道内径处处相等。 这样， 流体从入水口进入阀体内后， 可在内径一致的流 道内流动， 从而使流体的流动阻力降低， 压力损失也变小。
可将该出口端 5设置为出口逐渐增大的圆锥形管道。
进一步的， 出口端 5和入口端 2可对称分布在流道的两端， 第一密封座管道 3和第二 密封座管道 31对称分布在流道的两端。

Claims

权利 要 求
、 一种控制球阀， 包括有阔体（1 )， 所述阀体（1 ) 内贯通有可供流体通过的流道， 所述流道两端包括入口端（2)和出口端（5)， 其特征在于： 所述入口端（2)为入 口逐渐缩小的圆锥形管道。
、 根据权利要求 1所述的控制球阀， 其特征在于： 所述流道包括有与出口端（5)和入 口端 （2)连接的球形阀芯管道（4)， 所述入口端 （2) 具有与球形阔芯管道（4) 连接的窄端 （21 ), 出口端 （5) 具有与球形阀芯管道 （4)连接的连接端， 所述出 口端 （5) 的连接端内径与球形阀芯管道（4) 的内径和窄端 （21 ) 的内径相等。 、 根据权利要求 2所述的控制球阔，其特征在于：所述流道还包括有连接于入口端（2) 和球形阀芯管道 (4)之间第一密封座管道（3)， 连接于球形阀芯管道（4)和出口 端 （5) 之间的第二密封座管道（31 )， 所述第一密封座管道 （3) 的内径和第二密 封座管道（31 ) 的内径与球形阀芯管道（4) 的内径相等。
、 根据权利要求 1或 2或 3所述的控制球阔， 其特征在于： 所述出口端（5)为出口逐渐 增大的圆锥形管道。
、 根据权利要求 3所述的控制球阀， 其特征在于： 所述第一密封座管道（3)和第二密 封座管道（31 ) 对称分布在所述流道的两端。
PCT/CN2008/000106 2007-12-18 2008-01-16 A control ball valve Ceased WO2009079888A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08700656.5A EP2226536A4 (en) 2007-12-18 2008-01-16 BALL CONTROL VALVES
US12/809,426 US20100327205A1 (en) 2007-12-18 2008-01-16 Control ball valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200720061753.9 2007-12-18
CNU2007200617539U CN201129493Y (zh) 2007-12-18 2007-12-18 一种控制球阀

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WO2009079888A1 true WO2009079888A1 (en) 2009-07-02

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US (1) US20100327205A1 (zh)
EP (1) EP2226536A4 (zh)
CN (1) CN201129493Y (zh)
WO (1) WO2009079888A1 (zh)

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CN201129493Y (zh) 2008-10-08

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