WO2013097695A1 - 流量计 - Google Patents

流量计 Download PDF

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Publication number
WO2013097695A1
WO2013097695A1 PCT/CN2012/087388 CN2012087388W WO2013097695A1 WO 2013097695 A1 WO2013097695 A1 WO 2013097695A1 CN 2012087388 W CN2012087388 W CN 2012087388W WO 2013097695 A1 WO2013097695 A1 WO 2013097695A1
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WO
WIPO (PCT)
Prior art keywords
valve body
throttle
disposed
hole
throttle valve
Prior art date
Application number
PCT/CN2012/087388
Other languages
English (en)
French (fr)
Inventor
郑殿会
Original Assignee
北京谊安医疗系统股份有限公司
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 北京谊安医疗系统股份有限公司 filed Critical 北京谊安医疗系统股份有限公司
Priority to US14/002,358 priority Critical patent/US9517322B2/en
Priority to BR112013023388A priority patent/BR112013023388A2/pt
Priority to MX2013010531A priority patent/MX338635B/es
Publication of WO2013097695A1 publication Critical patent/WO2013097695A1/zh

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Classifications

    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/01—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes specially adapted for anaesthetising
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
    • A61M16/122—Preparation of respiratory gases or vapours by mixing different gases with dilution
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/208—Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves
    • A61M16/209—Relief valves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/22—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by variable-area meters, e.g. rotameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/22—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by variable-area meters, e.g. rotameters
    • G01F1/26—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by variable-area meters, e.g. rotameters of the valve type
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
    • 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
    • A61M2205/3334—Measuring or controlling the flow rate

Definitions

  • This invention relates to flow meters, and more particularly to flow meters for use in an anesthesia machine. Background technique
  • the flow meter is an important part of the anesthesia machine.
  • the doctor adjusts the flow meter to provide oxygen suitable for the flow to the patient.
  • the existing flowmeter for an anesthesia machine has the following problems: (1) When the anesthesia machine bellows is working normally, the flowmeter float is beating; (2) When the airflow resistance at the outlet end of the flowmeter is too large, the gas in the flowmeter cannot be effectively discharged; (3) The structure is complicated and the manufacturing cost is high. Summary of the invention
  • the object of the present invention is to provide a flow meter to solve the complicated structure of the flowmeter used in the anesthesia machine, and the manufacturing cost is high.
  • the flowmeter floats to jump, and the gas in the flowmeter when the outlet end of the flowmeter is too large The problem that cannot be effectively discharged.
  • a flow meter includes a lower valve body, a throttle valve assembly, a flow tube assembly, an upper valve body, and a pressure fluctuation suppression assembly, wherein the lower valve body is provided with an air inlet, an air outlet, and the air inlet and the outlet a gas flow passage of the gas port, wherein the lower valve body is further provided with a throttle valve assembly for adjusting the opening degree of the air flow passage in the lower valve body, the flow tube assembly comprising a flow tube, an upper base, a lower base and a float, a vent hole is disposed at an axial center of the upper base and the lower base, a lower base is disposed at an air outlet of the lower valve body, and a vertical airflow passage and a horizontal airflow passage are disposed in the upper valve body, An upper base is disposed at an air inlet of the vertical airflow passage in the upper valve body, and the flow tube is disposed on the upper base and the lower base through the two ends of the upper base and the lower base The seat is disposed in the flow tube, and the pressure
  • the safety valve assembly includes a safety valve body, a safety valve stem, a sealing jaw, a spring, a stopper and a nut, and the safety valve body has a through hole at an axial center thereof, and the through hole is provided There is a blocking step extending toward a central axis of the through hole, one end surface of the blocking step is a tapered surface, and the safety valve stem includes a round rod portion and a conical valve head, and the round rod portion One end is connected to the small end of the conical valve head, and the other end is provided with a thread.
  • the conical surface of the conical valve head is provided with an annular groove, and the annular groove is provided with a sealing ⁇ .
  • the safety valve stem is disposed in the safety valve body, the spring is sleeved on the round rod portion of the safety valve stem, and is disposed between the stopper and the blocking step by the stopper and the nut,
  • the conical valve head is in sealing contact with the tapered surface of the blocking step by a sealing jaw disposed in the annular groove thereof, the gap between the tapered valve head cone surface and the blocking step cone surface and the level The air flow paths are connected.
  • the throttle valve assembly includes a throttle valve body, a throttle, a throttle valve stem and a knob
  • the throttle valve body has a through hole at an axial center thereof and a hole in one end of the throttle valve a throttle body
  • the throttle valve body is located on a portion of the throttle body and radially provided with an air outlet hole
  • the throttle end of the throttle valve body is screwed on the lower valve body
  • the intake hole of the throttle center communicates with the air inlet of the lower valve body
  • the air outlet of the throttle valve body communicates with the air outlet of the lower valve body
  • One end of the throttle valve stem is a needle-shaped throttle end, and the needle-shaped throttle end is screwed into a through hole opened in an axial center of the throttle valve body, and is connected to the throttle center
  • the air inlet hole cooperates to realize the throttling function
  • the other end of the throttle valve stem is fixedly connected with a knob.
  • the throttle valve assembly further includes a lock button for limiting a length of the throttle valve stem from the throttle valve body, the lock button sleeved on the throttle valve stem, and Screwed into the valve body of the throttle valve Non-throttled end.
  • the throttle valve assembly further includes a lock for restricting the throttle valve stem from being screwed into the length of the throttle valve body, the lock being fixed to the throttle valve stem between the lock knob and the knob On the part.
  • the flow meter further comprises a backlight board, the backlight board is disposed at the rear of the flow tube, and the upper and lower ends thereof are respectively disposed on the special groove and the upper valve body on the lower valve body The upper end is fixed by a pressure plate, and the pressure plate is fixed to the upper valve body by screws.
  • the gasket is in the shape of a star.
  • the working principle of the invention is as follows: by setting a pressure fluctuation preventing component in the flowmeter, such as a sealing gasket for partial pressure, so that the float of the flowmeter does not jump when the bellows of the anesthesia machine is working normally; by setting a safety valve on the flowmeter When the flowmeter is too large at the outlet end, the gas in the flowmeter can be effectively discharged and the pressure can be reduced by itself.
  • a pressure fluctuation preventing component in the flowmeter such as a sealing gasket for partial pressure
  • FIG. 1 is a cross-sectional structural view of a flow meter according to an embodiment of the present invention.
  • Figure 2 is a cross-sectional structural view showing the upper valve body portion of the flow meter shown in Figure 1.
  • Figure 3 is a perspective view showing the structure of the gasket used in the flow meter shown in Figure 1.
  • the flow meter of this embodiment includes a lower valve body 1, a throttle valve assembly, a flow tube assembly, an upper valve body 2, and a pressure fluctuation suppression assembly, and the lower valve body 1 is provided with an intake air. a port, an air outlet, and an air flow passage connecting the air inlet and the air outlet, wherein the lower valve body 1 is further provided with a throttle valve assembly for adjusting the opening degree of the air flow passage in the lower valve body 1, the flow tube assembly
  • the flow tube 3, the upper base 4, the lower base 5 and the float 6 are provided.
  • the axial centers of the upper base 4 and the lower base 5 are respectively provided with vent holes, and the air outlet of the lower valve body 1 is disposed.
  • the wave assembly includes a gasket 7 disposed at an air outlet of the vertical air flow path .
  • the flow meter further includes a safety valve disposed on the upper valve body 2, the intake port of the safety valve being in communication with the horizontal air flow passage.
  • the safety valve assembly includes a safety valve body 8, a safety valve stem 9, a sealing jaw 10, a spring 11, a stopper 12, and a nut.
  • the safety valve body 8 has a through hole at an axial center thereof.
  • the hole has a blocking step extending toward the central axis of the through hole, one end surface of the blocking step is a tapered surface, and the safety valve stem 9 includes a round rod portion and a conical valve head, One end of the round rod portion is connected to the small end of the conical valve head, and the other end is provided with a thread.
  • the tapered surface of the conical valve head is provided with an annular groove, and the annular groove is provided therein.
  • the safety valve stem 9 is disposed in the safety valve body 8
  • the spring 11 is sleeved on the round rod portion of the safety valve stem 9, and passes through the stopper 12 and the nut
  • the tapered valve head is disposed in its annular groove
  • the inner sealing jaw 10 is in sealing contact with the tapered surface of the blocking step, and a gap between the tapered valve head tapered surface and the blocking step tapered surface communicates with the horizontal air flow passage.
  • the throttle valve assembly includes a throttle valve body 13, a throttle 14, a throttle valve stem 15, and a knob 16.
  • the throttle valve body 13 has a through hole at an axial center thereof and a hole at one end thereof.
  • a throttle fin 14 is embedded therein, and a portion of the throttle valve body 13 behind the throttle fin 14 is radially provided with an air outlet hole, and an air intake hole at the center of the throttle fin 14 and the lower valve body 1
  • the upper air inlet communicates with the air outlet of the throttle valve body 13 and the air outlet of the lower valve body 1, and one end of the throttle valve stem 15 is a needle-shaped throttle end.
  • the needle-shaped throttle end is screwed into a through hole opened in the axial center of the throttle valve body 13 and cooperates with an intake hole at the center of the throttle fin 14 to realize a throttle function, and the throttle valve A knob 16 is fixedly coupled to the other end of the valve stem 15.
  • the throttle valve assembly further includes a lock knob 17 for limiting the length of the throttle valve stem 15 from the throttle valve body 13, the lock knob 17 being sleeved on the throttle valve stem 15 And screwed into the non-throttle end of the throttle valve body 13.
  • the throttle valve assembly further includes a lock 18 for restricting the length of the throttle valve stem 15 from being inserted into the throttle valve body 13, the lock 18 being fixed to the throttle valve stem 15 at the lock button 17 and the part between the knobs 16.
  • the flow meter further includes a backlight 19, the backlight 19 is disposed at the rear of the flow tube 3, and the upper and lower ends thereof are respectively disposed on the special groove on the lower valve body 1 and the upper valve body 2 In the special step, the upper end is fixed by a pressure plate 20, and the pressure plate 20 is screwed to the upper valve body 2.
  • the shape of the gasket 7 is star-shaped, and its star-shaped side acts as a limit in the corresponding hole of the upper valve body 2.
  • the working process of the flow meter of this embodiment is: First, the gas enters from the air inlet of the lower valve body 1 The air flow passage in the valve body 1, and then the gas reaches the throttle 14 of the throttle valve assembly. At this time, the adjustment knob 16 opens the intake hole at the center of the throttle fin 14 and the gas passes through the intake air at the center of the throttle fin 14 The air outlet opening of the hole and the throttle valve body 13 located behind the throttle fin 14 and the air flow passage in the lower valve body 1 reach the lower base 5 and enter the axial center of the lower base 5 The vent hole, then, the gas pushes the float 6 upward, and simultaneously opens the vent hole disposed at the axial center of the lower base 5, and the gas enters the flow tube 3 through the vent hole provided at the axial center of the lower base 5, and passes through the float 6 and The gap between the flow tubes 3 flows to the upper base 4, and then the gas flows through the vent holes provided in the axial center of the upper base 4, and enters the vertical air flow passage provided in the upper valve body 2, and then push
  • the safety valve stem 9 separates the safety valve stem 9 from the safety valve body 8, and part of the gas is discharged from the exhaust port on the safety valve body 8, and the pressure in the horizontal air passage of the upper valve body 2 is decreased.
  • the safety valve stem 9 is returned by the action of the spring 11 to return to the sealing contact with the safety valve body 8.
  • the back end of the flow meter When the flow meter of the embodiment is used on an anesthesia machine and the anesthesia machine bellows is working normally, the back end of the flow meter has periodic resistance fluctuations, and thus the horizontal air flow path of the upper valve body 2 and the periodic pressure fluctuations in the vertical air flow path At this time, the gasket 7 bears a partial pressure action in the pressure fluctuation, so that the force generated by the fluctuation is weakened on the float 6, so that the float 6 does not jump when the bellows operates normally.
  • the invention has the following advantages: (1) When the bellows of the anesthesia machine is working normally, the flowmeter float does not jump; (2) when the air resistance at the outlet end of the flowmeter is too large, the gas in the flowmeter can be effectively discharged and the pressure is reduced by itself; (3) Simple structure and low manufacturing cost

Landscapes

  • Health & Medical Sciences (AREA)
  • Anesthesiology (AREA)
  • Pulmonology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Emergency Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Safety Valves (AREA)
  • Measuring Volume Flow (AREA)

Abstract

一种流量计包括下阀体（1）、节流阀组件、流量管组件、上阀体（2）和抑制压力波动组件，所述下阀体（1）内设置有进气口、出气口及连通所述进气口和出气口的气流通道，所述下阀体（1）上还设置有用于调节下阀体（1）内气流通道开度的节流阀组件，所述流量管组件包括流量管（3）、上基座（4）、下基座（5）和浮子（6），所述上基座（4）和下基座（5）的轴向中心均设置有通气孔，所述下阀体（1）的出气口处设置有下基座（5），所述上阀体（2）内设置有竖直气流通路和水平气流通路，所述上阀体（2）内竖直气流通路的进气口处设置有上基座（4），所述流量管（3）通过其分别套在上基座（4）和下基座（5）的凸起部外的两端设置在上基座（4）和下基座（5）间，所述浮子（6）设置在流量管（3）内，所述抑制压力波动组件包括密封垫（7），所述密封垫（7）设置在所述竖直气流通路的出气口处。

Description

流量计 技术领域
本发明涉及流量计， 特别涉及用于麻醉机的流量计。 背景技术
流量计是麻醉机一个重要部件， 医生通过调节流量计来提供适合流量的氧 气给病人。 现有的用于麻醉机的流量计存在以下问题： （1 )麻醉机风箱正常工 作时， 流量计浮子跳动； （2 ) 流量计出口端气阻过大时， 流量计内气体不能有 效排出； （3 ) 结构复杂， 制造成本高。 发明内容
本发明的目的是提供一种流量计， 以解决现有用于麻醉机的流量计结构复 杂， 制造成本高， 风箱正常工作时流量计浮子跳动， 流量计出口端气阻过大时 流量计内气体不能有效排出的问题。
本发明的目的是通过以下技术方案来实现的：
一种流量计， 包括下阀体、 节流阀组件、 流量管组件、 上阀体和抑制压力 波动组件， 所述下阀体内设置有进气口、 出气口及连通所述进气口和出气口的 气流通道， 所述下阀体上还设置有用于调节下阀体内气流通道开度的节流阀组 件， 所述流量管组件包括流量管、 上基座、 下基座和浮子， 所述上基座和下基 座的轴向中心均设置有通气孔， 所述下阀体的出气口处设置有下基座， 所述上 阀体内设置有竖直气流通路和水平气流通路， 所述上阀体内竖直气流通路的进 气口处设置有上基座， 所述流量管通过其分别套在上基座和下基座的凸起部外 的两端设置在上基座和下基座间， 所述浮子设置在流量管内， 所述抑制压力波 动组件包括密封垫， 所述密封塾设置在所述竖直气流通路的出气口处。 优选地， 所述流量计还包括安全阀， 所述安全阀设置在上阀体上， 所述安 全阀的进气口与所述水平气流通路相连通。
优选地， 所述安全阀组件包括安全阀阀体、 安全阀阀杆、 密封圏、 弹簧、 挡块和螺母， 所述安全阀阀体的轴向中心开设有通孔， 所述通孔内带有一个向 所述通孔中轴线延伸的阻挡台阶， 所述阻挡台阶的一个端面为锥面， 所述安全 阀阀杆包括一圆杆部和一锥形阀头部， 所述圆杆部的一端与所述锥形阀头部的 小端连接， 另一端上设置有螺纹， 所述锥形阀头部的锥面上开设有环形凹槽， 且所述环形凹槽内设置有密封圏， 所述安全阀阀杆设置在安全阀阀体内， 所述 弹簧套设在所述安全阀阀杆的圆杆部上， 并通过所述挡块和螺母设置在挡块和 阻挡台阶之间， 所述锥形阀头部通过设置在其环形 槽内的密封圏与所述阻挡 台阶的锥面密封接触， 所述锥形阀头部锥面与所述阻挡台阶锥面间的间隙与所 述水平气流通路相连通。
优选地， 所述节流阀组件包括节流阀阀体、 节流圏、 节流阀阀杆和旋钮， 所述节流阀阀体的轴向中心开设有通孔， 其一端的孔内镶嵌有节流圏， 所述节 流阀阀体位于节流圏后的部分上径向开设有出气孔， 所述节流阀阀体的节流圏 端旋合在所述下阀体上专设的孔内， 所述节流圏中心的进气孔与所述下阀体上 的进气口相通， 所述节流阀阀体上的出气孔与所述下阀体上的出气口相通， 所 述节流阀阀杆的一端为针形节流端， 所述针形节流端旋合在所述节流阀阀体轴 向中心开设的通孔内， 并与所述节流圏中心的进气孔配合实现节流功能， 所述 节流阀阀杆的另一端固定连接有旋钮。
优选地， 所述节流阀组件还包括用于限制节流阀阀杆从节流阀阀体旋出的 长度的锁钮， 所述锁钮套设在所述节流阀阀杆上， 并旋合在所述节流阀阀体的 非节流圏端。
优选地， 所述节流阀组件还包括用于限制节流阀阀杆旋入节流阀阀体内长 度的锁圏， 所述锁圏固定在节流阀阀杆位于所述锁钮和旋钮间的部分上。
优选地， 所述流量计还包括背光板， 所述背光板安置于所述流量管的后方， 其上、 下两端分别置于下阀体上专设的凹槽和上阀体上专设的台阶内， 且其上 端由压板固定， 所述压板用螺钉固定于上阀体上。
优选地， 所述密封垫的形状为星形。
本发明的工作原理为： 通过在流量计内设置抑制压力波动组件， 如起分压 作用的密封垫， 使流量计的浮子在麻醉机风箱正常工作时不跳动； 通过在流量 计上设置安全阀， 使流量计在出口端气阻过大时， 流量计内气体能有效排出并 自行降低压力。
本发明的有益效果为： （ 1 )麻醉机风箱正常工作时， 流量计浮子不跳动； ( 2 )流量计出口端气阻过大时，流量计内气体能有效排出并自行降低压力；（3 ) 结构简单， 制造成本低。 附图说明
下面根据附图和实施例对本发明作进一步详细说明。
图 1是本发明实施例的流量计的剖视结构示意图。
图 2是图 1所示流量计的上阀体部分的剖视结构示意图。
图 3是用于图 1所示流量计的密封垫的立体结构示意图。
图中： 1、 下阀体； 2、 上阀体； 3、 流量管； 4、 上基座； 5、 下基座； 6、 浮子； 7、 密封垫； 8、 安全阀阀体； 9、 安全阀阀杆； 10、 密封圏； 11、 弹簧； 12、 挡块； 13、 节流阀阀体； 14、 节流圏； 15、 节流阀阀杆； 16、 旋钮； 17、 锁钮； 18、 锁圏； 19、 背光板； 20、 压板。
具体实施方式
如图 1 ~ 3所示， 本实施例的流量计包括下阀体 1、 节流阀组件、 流量管组 件、 上阀体 2和抑制压力波动组件， 所述下阀体 1 内设置有进气口、 出气口及 连通所述进气口和出气口的气流通道， 所述下阀体 1上还设置有用于调节下阀 体 1内气流通道开度的节流阀组件， 所述流量管组件包括流量管 3、 上基座 4、 下基座 5和浮子 6， 所述上基座 4和下基座 5的轴向中心均设置有通气孔， 所 述下阀体 1的出气口处设置有下基座 5, 所述上阀体 2内设置有竖直气流通路 和水平气流通路， 所述上阀体内竖直气流通路的进气口处设置有上基座 4， 所 述流量管 3通过其分别套在上基座 4和下基座 5的凸起部外的两端设置在上基 座 4和下基座 5间， 所述浮子 6设置在流量管 3内， 所述抑制压力波动组件包 括密封垫 7， 所述密封垫 7设置在所述竖直气流通路的出气口处。
所述流量计还包括安全阀， 所述安全阀设置在上阀体 2上， 所述安全阀的 进气口与所述水平气流通路相连通。
所述安全阀组件包括安全阀阀体 8、 安全阀阀杆 9、 密封圏 10、 弹簧 11、 挡块 12和螺母， 所述安全阀阀体 8的轴向中心开设有通孔， 所述通孔内带有一 个向所述通孔中轴线延伸的阻挡台阶， 所述阻挡台阶的一个端面为锥面， 所述 安全阀阀杆 9包括一圆杆部和一锥形阀头部， 所述圆杆部的一端与所述锥形阀 头部的小端连接， 另一端上设置有螺纹， 所述锥形阀头部的锥面上开设有环形 凹槽， 且所述环形凹槽内设置有密封圏 10， 所述安全阀阀杆 9设置在安全阀阀 体 8内，所述弹簧 11套设在所述安全阀阀杆 9的圆杆部上，并通过所述挡块 12 和螺母设置在挡块 12和阻挡台阶之间，所述锥形阀头部通过设置在其环形 槽 内的密封圏 10与所述阻挡台阶的锥面密封接触，所述锥形阀头部锥面与所述阻 挡台阶锥面间的间隙与所述水平气流通路相连通。
所述节流阀组件包括节流阀阀体 13、节流圏 14、节流阀阀杆 15和旋钮 16, 所述节流阀阀体 13 的轴向中心开设有通孔， 其一端的孔内镶嵌有节流圏 14， 所述节流阀阀体 13位于节流圏 14后的部分上径向开设有出气孔， 所述节流圏 14中心的进气孔与所述下阀体 1上的进气口相通， 所述节流阀阀体 13上的出 气孔与所述下阀体 1上的出气口相通，所述节流阀阀杆 15的一端为针形节流端， 所述针形节流端旋合在所述节流阀阀体 13轴向中心开设的通孔内，并与所述节 流圏 14中心的进气孔配合实现节流功能， 所述节流阀阀杆 15的另一端固定连 接有旋钮 16。
所述节流阀组件还包括用于限制节流阀阀杆 15从节流阀阀体 13旋出的长 度的锁钮 17， 所述锁钮 17套设在所述节流阀阀杆 15上， 并旋合在所述节流阀 阀体 13的非节流圏端。
所述节流阀组件还包括用于限制节流阀阀杆 15旋入节流阀阀体 13内长度 的锁圏 18， 所述锁圏 18固定在节流阀阀杆 15位于所述锁钮 17和旋钮 16间的 部分上。
所述流量计还包括背光板 19， 所述背光板 19安置于所述流量管 3的后方， 其上、 下两端分别置于下阀体 1上专设的凹槽和上阀体 2上专设的台阶内， 且 其上端由压板 20固定， 所述压板 20用螺钉固定于上阀体 2上。
所述密封垫 7的形状为星形， 其星形边在上阀体 2对应孔内起限位作用。 所述节流圏 14中心的进气孔
本实施例的流量计的工作过程为： 首先， 气体从下阀体 1 的进气口进入下 阀体 1内的气流通道， 接着， 气体到达节流阀组件的节流圏 14处， 此时， 调节 旋钮 16使节流圏 14中心的进气孔开启， 气体通过节流圏 14中心的进气孔、 节 流阀阀体 13位于节流圏 14后的部分上径向开设的出气孔和下阀体 1 内的气流 通道到达下基座 5处， 并进入下基座 5轴向中心设置的通气孔， 然后， 气体推 动浮子 6向上移动， 同时将下基座 5轴向中心设置的通气孔打开， 气体通过下 基座 5轴向中心设置的通气孔进入流量管 3， 并通过浮子 6与流量管 3之间的 间隙流到上基座 4处， 接着， 气体流过上基座 4轴向中心设置的通气孔， 并进 入上阀体 2内设置的竖直气流通路， 然后， 向上推开设置在所述竖直气流通路 出气口处的密封垫 7， 并流入上阀体 2内设置的水平气流通路， 最终从上阀体 2 上的出气口流到与流量计连接的后端设备。
当与流量计连接的后端设备的气阻增大时， 流量计上阀体 2的水平气流通 路内的压强也随之增大， 当水平气流通路内的压强达到设定值时， 气体推动安 全阀阀杆 9， 使安全阀阀杆 9与安全阀阀体 8分离， 部分气体从安全阀阀体 8 上的排气口排出， 上阀体 2的水平气流通路内的压强随之下降， 当水平气流通 路内的压强低于设定值时， 安全阀阀杆 9在弹簧 11的作用下回位， 恢复与安全 阀阀体 8的密封接触。
当本实施例的流量计用在麻醉机上， 且麻醉机风箱正常工作时， 流量计后 端有周期的阻力波动， 进而上阀体 2的水平气流通路及竖直气流通路内有周期 的压力波动， 此时， 密封垫 7在压力波动中承担分压作用， 使波动产生的作用 力减弱作用于浮子 6， 从而使浮子 6在风箱正常工作时不跳动。
本发明具有以下优点： （ 1 )麻醉机风箱正常工作时， 流量计浮子不跳动； ( 2 )流量计出口端气阻过大时，流量计内气体能有效排出并自行降低压力；（3 ) 结构简单， 制造成本低

Claims

1、 一种流量计， 其特征在于： 包括下阀体、 节流阀组件、 流量管组件、 上 阀体和抑制压力波动组件， 所述下阀体内设置有进气口、 出气口及连通所述进 气口和出气口的气流通道， 所述下阀体上还设置有用于调节下阀体内气流通道 开度的节流阀组件， 所述流量管组件包括流量管、 上基座、 下基座和浮子， 所 述上基座和下基座的轴向中心均设置有通气孔， 所述下阀体的出气口处设置有 下基座， 所述上阀体内设置有竖直气流通路和水平气流通路， 所述上阀体内竖 直气流通路的进气口处设置有上基座， 所述流量管通过其分别套在上基座和下 基座的凸起部外的两端设置在上基座和下基座间， 所述浮子设置在流量管内， 所述抑制压力波动组件包括密封垫， 所述密封垫设置在所述竖直气流通路的出 气口处。
2、 根据权利要求 1所述的流量计， 其特征在于： 还包括安全阀， 所述安全 阀设置在上阀体上， 所述安全阀的进气口与所述水平气流通路相连通。
3、 根据权利要求 1所述的流量计， 其特征在于： 所述安全阀组件包括安全 阀阀体、 安全阀阀杆、 密封圏、 弹簧、 挡块和螺母， 所述安全阀阀体的轴向中 心开设有通孔， 所述通孔内带有一个向所述通孔中轴线延伸的阻挡台阶， 所述 阻挡台阶的一个端面为锥面， 所述安全阀阀杆包括一圆杆部和一锥形阀头部， 所述圆杆部的一端与所述锥形阀头部的小端连接， 另一端上设置有螺纹， 所述 锥形阀头部的锥面上开设有环形凹槽， 且所述环形凹槽内设置有密封圏， 所述 安全阀阀杆设置在安全阀阀体内，所述弹簧套设在所述安全阀阀杆的圆杆部上， 并通过所述挡块和螺母设置在挡块和阻挡台阶之间， 所述锥形阀头部通过设置 在其环形 W槽内的密封圏与所述阻挡台阶的锥面密封接触， 所述锥形阀头部锥 面与所述阻挡台阶锥面间的间隙与所述水平气流通路相连通。
4、 根据权利要求 1所述的流量计， 其特征在于： 所述节流阀组件包括节流 阀阀体、 节流圏、 节流阀阀杆和旋钮， 所述节流阀阀体的轴向中心开设有通孔， 其一端的孔内镶嵌有节流圏， 所述节流阀阀体位于节流圏后的部分上径向开设 有出气孔， 所述节流阀阀体的节流圏端旋合在所述下阀体上专设的孔内， 所述 节流圏中心的进气孔与所述下阀体上的进气口相通， 所述节流阀阀体上的出气 孔与所述下阀体上的出气口相通， 所述节流阀阀杆的一端为针形节流端， 所述 针形节流端旋合在所述节流阀阀体轴向中心开设的通孔内， 并与所述节流圏中 心的进气孔配合实现节流功能， 所述节流阀阀杆的另一端固定连接有旋钮。
5、 根据权利要求 4所述的流量计， 其特征在于： 所述节流阀组件还包括用 于限制节流阀阀杆从节流阀阀体旋出的长度的锁钮， 所述锁钮套设在所述节流 阀阀杆上， 并旋合在所述节流阀阀体的非节流圏端。
6、 根据权利要求 5所述的流量计， 其特征在于： 所述节流阀组件还包括用 于限制节流阀阀杆旋入节流阀阀体内长度的锁圏， 所述锁圏固定在节流阀阀杆 位于所述锁钮和旋钮间的部分上。
7、 根据权利要求 1所述的流量计， 其特征在于： 还包括背光板， 所述背光 板安置于所述流量管的后方， 其上、 下两端分别置于下阀体上专设的凹槽和上 阀体上专设的台阶内， 且其上端由压板固定， 所述压板用螺钉固定于上阀体上。
8、根据权利要求 1所述的流量计，其特征在于：所述密封垫的形状为星形。
PCT/CN2012/087388 2011-12-30 2012-12-25 流量计 WO2013097695A1 (zh)

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