WO2012100473A1 - 血液透析用自复位减压阀 - Google Patents
血液透析用自复位减压阀 Download PDFInfo
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- WO2012100473A1 WO2012100473A1 PCT/CN2011/074503 CN2011074503W WO2012100473A1 WO 2012100473 A1 WO2012100473 A1 WO 2012100473A1 CN 2011074503 W CN2011074503 W CN 2011074503W WO 2012100473 A1 WO2012100473 A1 WO 2012100473A1
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- valve
- valve body
- spring
- fixing
- seat
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/24—Check- or non-return valves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/24—Check- or non-return valves
- A61M2039/242—Check- or non-return valves designed to open when a predetermined pressure or flow rate has been reached, e.g. check valve actuated by fluid
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
Definitions
- the present invention is in the field of hemodialysis technology, and in particular, it relates to a self-resetting pressure reducing valve for hemodialysis.
- the pressure reducing valve is an important component on the hemodialysis machine, which acts to regulate and control the pressure of the pipeline.
- the pressure reducing valve used on the hemodialysis machine is generally composed of a valve body and a valve core assembly, and the disadvantages are:
- the valve body is usually made of metal, the valve body is apt to rust, or the medical fluid is contaminated by the precipitation of metal ions.
- the rubber diaphragm is usually used to reset the seal.
- the rubber diaphragm is easy to age, and the rubber diaphragm is inelastic, which will reduce the reliability of the pressure reducing valve.
- the technical problem to be solved by the present invention is to provide a self-resetting pressure reducing valve for hemodialysis having good reliability.
- the self-resetting pressure reducing valve for hemodialysis of the present invention comprises a valve body and a valve seat, a valve core and an adjusting assembly disposed on the valve body, the adjusting assembly comprising a first spring, a diaphragm and a second spring, the diaphragm Separating and sealing the valve body; the liquid inlet of the valve seat is located at a lower portion of the valve seat, and the valve core is located at a lower portion of the valve seat to be engaged with the opening and closing; the first spring applies a downward preload to the valve core through the diaphragm piece The second spring applies an upward pre-tightening force to the valve core, and the valve body is threadedly provided with an adjusting screw for adjusting the pre-tightening force of the first spring.
- valve body includes an upper valve body and a lower valve body fixed to a lower end of the upper valve body, and a top of the upper valve body An adjusting screw is disposed from the top to the bottom, the lower end of the adjusting screw extends into the inner cavity of the upper valve body, and is pressed against the top surface of the pressure pad, and the lower end of the pressure pad is fixed to the upper end of the first spring,
- the lower valve body is provided with an inlet joint and a liquid outlet joint, and the lower valve body has an upper chamber and a lower chamber, wherein the upper chamber communicates with the inner hole of the liquid outlet joint, and the lower chamber communicates with the inner hole of the liquid inlet joint And the upper and lower chambers communicate with each other through a small hole in the valve seat;
- a fixing cup is mounted in the small hole in the valve seat, the lower end of the fixing cup is embedded in the inner cavity of the fixing seat, the fixing seat is located in the lower chamber, and the inner cavity of the fixing seat and the liquid inlet joint are The hole is connected; a shaft pin is disposed in the center hole of the fixing cup, and the valve core is a shaft head integrally formed with the shaft pin, and the shaft pin is matched with the center hole of the fixing cup, and the shaft head of the shaft pin is located at the fixing seat In the inner cavity, the central hole of the fixing cup can be blocked, and the second pin is set on the shaft pin, and the lower end of the second spring abuts the step surface in the central hole of the fixing cup, the second spring The upper end abuts the snap ring provided on the upper part of the shaft pin, the upper end of the shaft pin abuts the lower end of the fixing block, the upper end of the fixing block abuts the lower end of the first spring; and the ring groove is arranged in the middle of the fixing
- the liquid enters the lower chamber of the lower valve body through the liquid inlet joint, and the first spring generates a downward pressure on the shaft pin through the fixing block, and the pressure exceeds the combined force of the elastic force of the second spring and the liquid pressure.
- the shaft pin is moved downward, and the shaft head of the shaft pin is opened to the center hole of the fixing cup, so the liquid entering the liquid inlet joint passes through the central hole of the fixing cup and enters the upper chamber of the lower valve body, because entering the upper chamber
- the liquid will exert a certain upward pressure on the diaphragm (assuming that the outlet joint of the lower valve body is completely blocked at this time), and the resultant force of the upward liquid pressure and the elastic force of the second spring will gradually overcome the downward pressure of the first spring.
- the maximum pressure generated by the liquid entering the upper chamber of the lower valve body ie, the highest pressure at the outlet of the lower valve body outlet joint
- the pressure at the outlet will be less than the pressure at the inlet joint; when the adjustment screw is adjusted downward, the maximum pressure will increase, and when the adjustment screw is adjusted upward, the maximum pressure will decrease.
- the present invention achieves a reduction in inlet pressure to outlet pressure, and the outlet pressure can be adjusted within a certain range.
- the adjusting screw causes the first spring to be in a fixed position, since the first spring force does not change (the minimum spring force of the second spring is also relatively fixed), even if the liquid pressure at the inlet is continuously increased, the highest pressure at the outlet It will also be constant.
- the second spring pushes the shaft pin up automatically, ensuring that the maximum pressure of the pressure reducing valve is always constant, so that the pressure reducing valve can always work reliably.
- a first sealing ring is installed between the fixing cup and the lower valve body; the sealing property is enhanced to prevent leakage between the fixing cup and the lower valve body.
- a second sealing ring is mounted between the fixing cup and the fixing seat, the central hole of the second sealing ring is opposite to the central hole of the fixing cup, and the shaft head of the shaft pin passes through the cone surface and the second sealing
- the central hole of the ring is matched; the above structure enhances the sealing between the fixing cup and the fixing seat on the one hand, and on the other hand, the opening and sealing of the central hole of the fixing cup of the fixing pin is more sensitive and reliable, and can be matched by the taper surface Guarantee the sealing effect when sealing.
- a third sealing ring is installed between the fixing seat and the lower valve body, the third sealing ring is lower than the inner hole of the liquid inlet joint; enhancing the sealing property, preventing leakage between the fixing seat and the lower valve body .
- a sealing plate is fixed on the bottom of the lower valve body, the sealing plate seals the lower port of the lower chamber, and the lower end of the fixing seat is embedded in the sealing plate, and the two are fixedly connected together; Easy to assemble.
- Figure 1 is a schematic view of the structure of the present invention.
- the self-resetting pressure reducing valve for hemodialysis of the embodiment includes a valve body and a valve seat, a valve core and an adjusting assembly disposed on the valve body, and the adjusting component includes a first spring 5, a diaphragm 14 and a second spring 11, the diaphragm 14 sealingly separating the valve body; the inlet of the valve seat is located at a lower portion of the valve seat, and the valve core is located at a lower portion of the valve seat and is opened and closed Cooperating; the first spring 5 applies a downward pre-tightening force to the valve core through the diaphragm piece 14, the second spring 11 applies an upward pre-tightening force to the valve core, and the valve body is screw-fitted for adjustment The pre-tightening adjustment screw 3 of the first spring 5; the adjustment screw 3 can be adjusted to the first spring 5 by any structure of the prior art.
- the valve body includes an upper valve body 1 and a lower valve body 2, and the upper and lower valve bodies 1, 2 are all made of medical rubber or plastic, and the upper valve body 1 is fastened to the lower valve body. 2, fixed together by multiple screws.
- a liquid inlet joint 6 is integrally formed on one side of the lower valve body 2, and a liquid discharge joint 7 is integrally formed on the other side.
- the lower valve body 2 has an upper chamber 2a and a lower chamber 2b.
- the upper chamber 2a and the lower chamber 2b are both circular, wherein the bottom opening of the upper chamber 2a communicates with the inner hole of the liquid outlet joint 7.
- the side wall opening of the lower chamber 2b communicates with the inner hole of the liquid inlet joint 6, and the upper and lower chambers 2a, 2b communicate with each other through the small hole.
- a fixing cup 8 is mounted in the small hole between the upper and lower chambers 2a, 2b, and a first sealing ring 15 is mounted between the fixing cup 8 and the lower valve body 2, the first sealing ring 15 is higher than the liquid inlet joint 6.
- the lower end of the fixing cup 8 is embedded in the inner cavity of the fixing seat 9 and is limited by the step surface in the inner cavity of the fixing seat 9.
- a second sealing ring 16 is mounted between the fixing cup 8 and the fixing seat 9.
- the central hole of the second sealing ring 16 faces the center hole of the fixing cup 8, and the center hole of the second sealing ring 16 and the center of the fixing cup 8 Lower end hole of the hole
- the ports are equal in size.
- the fixing seat 9 is located in the lower chamber 2b, and the inner cavity of the fixing seat 9 communicates with the inner hole of the liquid inlet joint 6 through the lateral through hole.
- the lower end of the holder 9 is embedded in the sealing plate 18, and the two are fixedly coupled together.
- the sealing plate 18 is fixed to the bottom of the lower valve body 2 by bolts, and the sealing plate 18 seals the lower port of the lower chamber 2b.
- a third sealing ring 17 is mounted between the fixing seat 9 and the lower valve body 2, and the third sealing ring 17 is lower than the inner hole of the liquid inlet joint 6.
- a shaft pin 10 is disposed in the center hole of the fixing cup 8, and the shaft pin 10 is matched with the center hole of the fixing cup 8, and the shaft head integrally formed at the bottom end of the shaft pin 10 is located at the fixing seat 9.
- the tapered surface between the shaft pin 10 and the shaft body can extend into the central hole of the second sealing ring 16, and the central hole of the fixing cup 8 is blocked.
- a second spring 11 is disposed on the shaft pin 10, and a lower end of the second spring 11 abuts a step surface in a central hole of the fixing cup 8, and an upper end of the second spring 11 and a snap ring 12 disposed on an upper portion of the shaft pin 10 Abutting, the snap ring 12 is located in the upper chamber 2a.
- the upper end of the shaft pin 10 abuts against the lower end of the fixing block 13, and a ring groove is arranged in the middle of the fixing block 13, and the diaphragm groove 14 is mounted in the ring groove, and the edge of the diaphragm piece 14 is composed of upper and lower valve bodies.
- the liquid enters the lower chamber 2b of the lower valve body 2 through the liquid inlet joint 6, since the first spring 5 generates a downward pressure on the shaft pin 10 through the fixing block 13, the pressure exceeding the elastic force and the liquid pressure of the second spring 11 The resultant force causes the shaft pin 10 to move downward, and the second sealing ring 16 cannot be sealed.
- the shaft head of the shaft pin 10 opens the center hole of the fixing cup 8, so that the liquid entering the liquid inlet joint 6 passes through the fixing cup 8
- the center hole enters the upper chamber 2a of the lower valve body 2, and the liquid entering the upper chamber 2a exerts a certain upward pressure on the diaphragm 14 (assuming that the outlet joint 7 of the lower valve body 2 is completely blocked at this time), the upward
- the resultant force of the liquid pressure and the elastic force of the second spring 11 gradually overcomes the downward pressure of the first spring 5 and moves the shaft pin 10 upward until the tapered surface between the shaft pin 10 and the shaft body extends into the first Two sealing ring 16
- the central hole of the fixing cup 8 is completely blocked, and the upper chamber 2a of the lower valve body 2 is isolated from the lower chamber 2b (the upper chamber 2a to the liquid outlet joint when the lower valve body outlet joint 7 is blocked)
- the pressure at 7 is the highest pressure at the outlet of the pressure reducing valve); if the outlet of the outlet joint 7 of the valve body 2 is opened as follows,
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Abstract
本发明公开了一种血液透析用自复位减压阀,包括阀体和设置于阀体的阀座、阀芯和调节组件,调节组件包括调整螺钉、第一弹簧、隔膜片和第二弹簧,所述隔膜片将阀体内密封分隔;阀座的进液口位于阀座下部,所述阀芯位于阀座的下部与其启闭配合;第一弹簧通过隔膜片对阀芯施加向下的预紧力,第二弹簧对阀芯施加向上的预紧力,调整螺钉用于调整第一弹簧的预紧力;本发明生物学性能好,不会生锈,有效避免了医用流体污染;用弹簧代替橡胶膜片复位密封,长期使用也能够保证减压的可靠性高,并且消除了传统结构因共振而产生噪音的弊病。
Description
说 明 书 血液透析用自复位减压阀 技术领域
本发明属于血液透析技术领域, 具体地说, 特别涉及血液透析用自复位减 压阀。
背景技术
减压阀是血液透析机上的重要部件, 起调节及控制管路压力的作用。 目前, 血液透析机上使用的减压阀一般由阀体和阀芯组件构成, 所存在的不足在于:
1 ) 通常采用金属制作阀体, 阀体易生锈, 或者因析出金属离子而污染医用 流体。
2 ) 通常采用橡胶膜片复位密封的方式, 橡胶膜片易老化, 橡胶膜片无弹性 后会降低减压阀的可靠性。
3 ) 阀体进口处密封圈的可靠性差, 容易出现密封不良, 偶尔出现减压效果 不好, 或因与进液产生共振而出现噪音较大的情况。
发明内容
本发明所要解决的技术问题在于提供一种可靠性好的血液透析用自复位减 压阀。
本发明的血液透析用自复位减压阀, 包括阀体和设置于阀体的阀座、 阀芯 和调节组件, 所述调节组件包括第一弹簧、 隔膜片和第二弹簧, 所述隔膜片将 阀体内密封分隔; 所述阀座的进液口位于阀座下部, 所述阀芯位于阀座的下部 与其启闭配合; 所述第一弹簧通过隔膜片对阀芯施加向下的预紧力, 所述第二 弹簧对阀芯施加向上的预紧力, 所述阀体上螺紋配合设置有用于调整第一弹簧 的预紧力的调整螺钉。
进一歩, 所述阀体包括上阀体和固定于上阀体下端的下阀体, 上阀体的顶
部由上往下穿设有调整螺钉, 该调整螺钉的下端伸入上阀体的内腔, 并抵压在 压垫的顶面, 压垫的下端与第一弹簧的上端固定, 在所述下阀体上设有进液接 头和出液接头, 下阀体内具有上部腔室和下部腔室, 其中上部腔室与出液接头 的内孔连通, 下部腔室与进液接头的内孔连通, 并且上、 下部腔室之间通过阀 座上的小孔相通;
进一歩, 在所述阀座上的小孔中安装有固定杯, 该固定杯的下端嵌入固定 座的内腔中, 固定座位于下部腔室内, 且固定座的内腔与进液接头的内孔连通; 在所述固定杯的中心孔内穿设有轴销, 阀芯为与轴销一体成型的轴头, 该轴销 与固定杯的中心孔间隙配合, 轴销的轴头位于固定座的内腔中, 并能将固定杯 的中心孔封堵, 在所述轴销上套装有第二弹簧, 该第二弹簧的下端与固定杯中 心孔内的台阶面抵接, 第二弹簧的上端与轴销上部设置的卡环相抵接, 所述轴 销的上端与固定块的下端抵接, 固定块的上端与第一弹簧的下端抵接; 在所述 固定块的中部设有环槽, 该环槽中安装有隔膜片, 所述隔膜片的边缘由上、 下 阀体、 压紧;
采用以上技术方案, 液体通过进液接头进入下阀体的下部腔室, 由于第一 弹簧会通过固定块对轴销产生一个向下的压力, 该压力超过第二弹簧的弹力与 液体压力的合力而让轴销向下移动, 并使轴销的轴头打开固定杯的中心孔, 故 进液接头进入的液体会通过固定杯的中心孔进入下阀体的上部腔室, 由于进入 上部腔室的液体会对隔膜片产生一定的向上压力 (假设此时下阀体的出液接头 完全堵塞), 该向上的液体压力与第二弹簧的弹力所形成的合力会逐渐克服第一 弹簧的向下压力并使轴销向上移动, 直到轴销的轴头将固定杯的中心孔完全封 堵, 下阀体的上部腔室与下部腔室隔离 (下阀体出液接头堵塞时, 上部腔室到 出液接头处的压力即为减压阀出口处的最高压力); 假如下阀体的出液接头出口 处打开时, 由于下阀体上部腔室内的压力下降, 使第一弹簧弹力与第二弹簧、 液体压力的平衡点破坏, 故第一弹簧会使轴销向下移动, 使进液接头处的液体 流向出液接头, 此时下阀体出液接头出口处的压力会小于出口被完全堵塞时的
压力。
进入下阀体上部腔室的液体产生的最高压力 (即下阀体出液接头出口堵塞 时的最高压力) 只能小于或等于下阀体进液接头的压力, 且出液接头出口不堵 塞时, 出口处的压力更会小于进液接头处的压力; 当调整螺钉向下调整时, 该 最高压力会增高, 当调整螺钉向上调整时, 该最高压力会降低。
有此可见, 本发明实现了进口压力到出口压力的降低, 且出口压力可在一 定范围调整。 当调整螺钉使第一弹簧在一固定位置时, 由于第一弹簧力不发生 变化 (第二弹簧向上的最小弹力也相对固定), 故即使进口处的液体压力不断增 大, 出口处的最高压力也会恒定。 当调整螺钉使第一弹簧松开时, 第二弹簧会 推动轴销自动向上移动, 确保减压阀的最高压力始终恒定, 进而使减压阀始终 能够可靠工作。
进一歩, 在所述固定杯与下阀体之间安装有第一密封圈; 增强密封性, 防 止固定杯与下阀体之间发生泄漏。
进一歩, 在所述固定杯与固定座之间安装有第二密封圈, 该第二密封圈的 中心孔正对固定杯的中心孔, 所述轴销的轴头通过锥面与第二密封圈的中心孔 配合; 以上结构一方面增强了固定杯与固定座之间的密封性, 另一方面, 轴销 控制固定杯中心孔的打开与封堵更灵敏、 可靠, 并且通过锥面配合能够保证封 堵时的密封效果。
进一歩, 在所述固定座与下阀体之间安装有第三密封圈, 该第三密封圈低 于进液接头的内孔; 增强密封性, 防止固定座与下阀体之间发生泄漏。
进一歩, 在所述下阀体的底部固定有封板, 该封板将下部腔室的下端口密 封, 所述固定座的下端嵌入封板中, 两者固定连接在一起; 为了简化结构、 方 便装配。
本发明的有益效果是:
1 ) 可采用医用橡胶和塑料制作, 生物学性能好, 不会生锈, 有效避免了医 用流体污染。
2 ) 用弹簧代替橡胶膜片复位密封, 长期使用也能够保证减压的可靠性高。
3 ) 密封性好, 不会发生泄漏, 并且消除了传统结构因共振而产生噪音的弊 病。
附图说明
下面结合附图和实施例对本发明作进一歩描述。
图 1为本发明的结构示意图。
具体实施方式
图 1 为本发明的结构示意图, 如图所示: 本实施例的血液透析用自复位减 压阀, 包括阀体和设置于阀体的阀座、 阀芯和调节组件, 所述调节组件包括第 一弹簧 5、 隔膜片 14和第二弹簧 11, 所述隔膜片 14将阀体内密封分隔; 所述 阀座的进液口位于阀座下部, 所述阀芯位于阀座的下部与其启闭配合; 所述第 一弹簧 5通过隔膜片 14对阀芯施加向下的预紧力, 所述第二弹簧 11对阀芯施 加向上的预紧力, 所述阀体上螺紋配合设置有用于调整第一弹簧 5 的预紧力的 调整螺钉 3 ;调整螺钉 3对第一弹簧 5的调整方式可以采用现有技术的任何结构。
如图所示, 本实施例中, 阀体包括上阀体 1和下阀体 2, 上、 下阀体 1、 2 均由医用橡胶或塑料制成, 并且上阀体 1扣装在下阀体 2上, 通过多颗螺钉固 定连接在一起。在下阀体 2的一侧一体形成有进液接头 6, 另一侧一体形成有出 液接头 7。 所述下阀体 2内具有上部腔室 2a和下部腔室 2b, 上部腔室 2a及下 部腔室 2b均为圆形, 其中上部腔室 2a的底部开孔与出液接头 7的内孔连通, 下部腔室 2b的侧壁开孔与进液接头 6的内孔连通, 并且上、 下部腔室 2a、 2b 之间通过小孔相通。
从图 1中可知, 在上、 下部腔室 2a、 2b之间的小孔中安装有固定杯 8, 该 固定杯 8与下阀体 2之间装有第一密封圈 15, 第一密封圈 15高于进液接头 6。 所述固定杯 8的下端嵌入固定座 9的内腔中, 由固定座 9内腔中的台阶面限位。 在固定杯 8与固定座 9之间安装有第二密封圈 16,该第二密封圈 16的中心孔正 对固定杯 8的中心孔, 并且第二密封圈 16的中心孔与固定杯 8中心孔的下端孔
口大小相等。 所述固定座 9位于下部腔室 2b内, 固定座 9的内腔通过横向通孔 与进液接头 6的内孔连通。 固定座 9的下端嵌入封板 18中, 两者固定连接在一 起。 封板 18通过螺栓固定于下阀体 2的底部, 该封板 18将下部腔室 2b的下端 口密封。 在所述固定座 9与下阀体 2之间安装有第三密封圈 17, 该第三密封圈 17低于进液接头 6的内孔。
从图 1中还可知, 在固定杯 8的中心孔内穿设有轴销 10, 该轴销 10与固定 杯 8的中心孔间隙配合, 轴销 10底端一体形成的轴头位于固定座 9的内腔中, 轴销 10轴头与轴身之间的锥面能够伸入第二密封圈 16的中心孔内,将固定杯 8 的中心孔封堵。 在所述轴销 10上套装有第二弹簧 11, 该第二弹簧 11的下端与 固定杯 8中心孔内的台阶面抵接, 第二弹簧 11的上端与轴销 10上部设置的卡 环 12相抵接, 卡环 12位于上部腔室 2a中。 所述轴销 10的上端与固定块 13的 下端抵接, 在固定块 13的中部设有环槽, 该环槽中安装有隔膜片 14, 所述隔膜 片 14的边缘由上、 下阀体 1、 2压紧, 隔膜片 14将上阀体 1的内腔与下阀体 2 的上部腔室 2a分隔开。 所述固定块 13的上端与第一弹簧 5的下端抵接, 第一 弹簧 5的上端与压垫 4的下端固定。 在所述上阀体 1的顶部由上往下穿设有调 整螺钉 3, 该调整螺钉 3与上阀体 1螺紋配合, 调整螺钉 3的下端伸入上阀体 1 的内腔, 并抵压在压垫 4的顶面。
本发明的工作原理如下:
液体通过进液接头 6进入下阀体 2的下部腔室 2b, 由于第一弹簧 5会通过 固定块 13对轴销 10产生一个向下的压力, 该压力超过第二弹簧 11的弹力与液 体压力的合力而让轴销 10向下移动, 并使第二密封圈 16不能密封, 此时轴销 10的轴头打开固定杯 8的中心孔, 故进液接头 6进入的液体会通过固定杯 8的 中心孔进入下阀体 2的上部腔室 2a, 由于进入上部腔室 2a的液体会对隔膜片 14产生一定的向上压力(假设此时下阀体 2的出液接头 7完全堵塞), 该向上的 液体压力与第二弹簧 11的弹力所形成的合力会逐渐克服第一弹簧 5的向下压力 并使轴销 10向上移动, 直到轴销 10轴头与轴身之间的锥面伸入第二密封圈 16
的中心孔内, 将固定杯 8的中心孔完全封堵, 下阀体 2的上部腔室 2a与下部腔 室 2b隔离 (下阀体出液接头 7堵塞时, 上部腔室 2a到出液接头 7处的压力即 为减压阀出口处的最高压力); 假如下阀体 2的出液接头 7出口处打开时, 由于 下阀体上部腔室 2a内的压力下降, 使第一弹簧弹力与第二弹簧、 液体压力的平 衡点破坏, 故第一弹簧 5会使轴销 10向下移动, 使进液接头 6处的液体流向出 液接头 7,此时下阀体出液接头 7出口处的压力会小于出口被完全堵塞时的压力。
最后说明的是, 以上实施例仅用以说明本发明的技术方案而非限制, 尽管 参照较佳实施例对本发明进行了详细说明, 本领域的普通技术人员应当理解, 可以对本发明的技术方案进行修改或者等同替换, 而不脱离本发明技术方案的 精神和范围, 其均应涵盖在本发明的权利要求范围当中。
Claims
1.一种血液透析用自复位减压阀, 其特征在于: 包括阀体和设置于阀体的 阀座、 阀芯和调节组件, 所述调节组件包括第一弹簧 (5)、 隔膜片 (14) 和第 二弹簧 (11), 所述隔膜片 (14) 将阀体内密封分隔; 所述阀座的进液口位于阀 座下部, 所述阀芯位于阀座的下部与其启闭配合; 所述第一弹簧 (5) 通过隔膜 片 (14) 对阀芯施加向下的预紧力, 所述第二弹簧 (11) 对阀芯施加向上的预 紧力, 所述阀体上螺紋配合设置有用于调整第一弹簧(5) 的预紧力的调整螺钉
(3)。
2.根据权利要求 1 所述的血液透析用自复位减压阀, 其特征在于: 所述阀 体包括上阀体 (1) 和固定于上阀体下端的下阀体 (2), 上阀体 (1) 的顶部由 上往下穿设有调整螺钉 (3), 该调整螺钉 (3) 的下端伸入上阀体 (1) 的内腔, 并抵压在压垫 (4) 的顶面, 压垫 (4) 的下端与第一弹簧 (5) 的上端固定, 在 所述下阀体 (2) 上设有进液接头 (6) 和出液接头 (7), 下阀体 (2) 内具有上 部腔室 (2a) 和下部腔室 (2b), 其中上部腔室 (2a) 与出液接头 (7) 的内孔 连通, 下部腔室 (2b) 与进液接头 (6) 的内孔连通, 并且上、 下部腔室 (2a、 2b) 之间通过阀座上的小孔相通。
3.根据权利要求 2所述的血液透析用自复位减压阀, 其特征在于: 在所述 阀座上的小孔中安装有固定杯 (8), 该固定杯 (8) 的下端嵌入固定座 (9) 的 内腔中, 固定座 (9) 位于下部腔室 (2b) 内, 且固定座 (9) 的内腔与进液接 头 (6) 的内孔连通; 在所述固定杯 (8) 的中心孔内穿设有轴销 (10), 阀芯为 与轴销(10)—体成型的轴头, 该轴销(10)与固定杯(8) 的中心孔间隙配合, 轴销 (10) 的轴头位于固定座 (9) 的内腔中, 并能将固定杯 (8) 的中心孔封 堵, 在所述轴销 (10) 上套装有第二弹簧 (11), 该第二弹簧 (11) 的下端与固 定杯 (8) 中心孔内的台阶面抵接, 第二弹簧 (11) 的上端与轴销 (10) 上部设 置的卡环 (12) 相抵接, 所述轴销 (10) 的上端与固定块 (13) 的下端抵接, 固定块 (13) 的上端与第一弹簧 (5) 的下端抵接; 在所述固定块 (13) 的中部 设有环槽, 该环槽中安装有隔膜片 (14), 所述隔膜片 (14) 的边缘由上、 下阀 体 (1、 2) 压紧。
4、 根据权利要求 3所述的血液透析用自复位减压阀, 其特征在于: 在所述 固定杯 (8) 与下阀体 (2) 之间安装有第一密封圈 (15)。
5、 根据权利要求 3或 4所述的血液透析用自复位减压阀, 其特征在于: 在 所述固定杯(8)与固定座(9)之间安装有第二密封圈(16),该第二密封圈(16) 的中心孔正对固定杯 (8) 的中心孔, 所述轴销 (10) 的轴头通过锥面与第二密 封圈 (16) 的中心孔配合。
6、 根据权利要求 3所述的血液透析用自复位减压阀, 其特征在于: 在所述 固定座 (9) 与下阀体 (2) 之间安装有第三密封圈 (17), 该第三密封圈 (17) 低于进液接头 (6) 的内孔。
7、 根据权利要求 3或 6所述的血液透析用自复位减压阀, 其特征在于: 在 所述下阀体 (2) 的底部固定有封板 (18), 该封板 (18) 将下部腔室 (2b) 的 下端口密封, 所述固定座(9) 的下端嵌入封板(18) 中, 两者固定连接在一起。
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