WO2022078220A1 - 流量调节阀 - Google Patents

流量调节阀 Download PDF

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Publication number
WO2022078220A1
WO2022078220A1 PCT/CN2021/121855 CN2021121855W WO2022078220A1 WO 2022078220 A1 WO2022078220 A1 WO 2022078220A1 CN 2021121855 W CN2021121855 W CN 2021121855W WO 2022078220 A1 WO2022078220 A1 WO 2022078220A1
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WO
WIPO (PCT)
Prior art keywords
valve
flow regulating
port
head
conical surface
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PCT/CN2021/121855
Other languages
English (en)
French (fr)
Inventor
詹少军
徐冠军
Original Assignee
浙江盾安人工环境股份有限公司
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Application filed by 浙江盾安人工环境股份有限公司 filed Critical 浙江盾安人工环境股份有限公司
Priority to KR1020237012851A priority Critical patent/KR20230066469A/ko
Priority to EP21879266.1A priority patent/EP4206501A1/en
Priority to JP2023515100A priority patent/JP2023544973A/ja
Priority to US18/028,767 priority patent/US20230332692A1/en
Publication of WO2022078220A1 publication Critical patent/WO2022078220A1/zh

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    • 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
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F16K1/38—Valve members of conical shape
    • 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
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • 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
    • F16K25/00—Details relating to contact between valve members and seats
    • 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
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present application relates to the technical field of flow control valves, and in particular, to a flow control valve.
  • valve port In the flow regulating valve, the valve port is opened or closed by the movement of the valve head in the valve body.
  • the peripheral edge of the end of the valve head contacts the inner wall of the valve port to form a sealing surface, so as to achieve sealing to close the valve port.
  • the sealing surface of the valve head is sharp and easy to wear, which affects the reliability of the sealing and the service life of the flow regulating valve.
  • the present application provides a flow regulating valve, so as to reduce the wear of the valve head and improve the sealing reliability of the valve port.
  • the present application provides a flow regulating valve, comprising: a valve body, the valve body has a valve port, the inner wall of the valve port has a first conical surface; a valve head, the end of the valve head is The valve head has rounded corners, and the valve head is movably arranged in the valve body to close or open the valve port; when the valve port is closed, the rounded corners and the first conical surface Abut.
  • a rounded corner is provided at the end of the valve head, and the valve port is sealed by the abutment of the rounded corner and the first conical surface.
  • the use of rounded corners reduces wear on contact, improves the reliability of the seal and the service life of the flow regulating valve.
  • the radius of the fillet is R, 0.1mm ⁇ R ⁇ 1.0mm.
  • the radius of the fillet is set to the above range, which is convenient for processing and has a good sealing effect.
  • the outer peripheral surface of the valve head is a cylindrical surface, and the included angle between the cylindrical surface and the first conical surface is A, where A ⁇ 10°. In this way, after the valve port is closed, the gap between the outer peripheral surface of the valve head and the first conical surface is small, which improves the sealing effect and reduces internal leakage.
  • the distance between the large diameter end of the first conical surface and the end surface of the valve head is L, where L ⁇ 2mm.
  • the inner wall of the valve port further has a second conical surface, and an end of the second conical surface with a smaller diameter is connected to an end of the first conical surface with a larger diameter.
  • the included angle between the generatrix of the first conical surface and the radial plane of the valve body is a
  • the angle between the generatrix of the second conical surface and the radial plane of the valve body is a.
  • the included angle is b, where a>b.
  • valve body has an accommodating cavity, the valve port communicates with the accommodating cavity, and the valve head is movably disposed in the accommodating cavity.
  • a flow port is provided on the side wall of the valve body, and when the valve port is opened, the valve port communicates with the flow port. When the valve port is closed, the valve port and the flow port are disconnected.
  • the flow regulating valve further comprises: a guide sleeve, which is arranged in the valve body, and the valve head is movably arranged in the guide sleeve; a driving part, the driving part is drivingly connected with the valve head , to drive the valve head to move.
  • the guide sleeve guides the valve head for smooth movement of the valve head.
  • the drive part can be driven by electromagnetic drive.
  • the flow regulating valve is an electronic expansion valve, or other forms of flow regulating valve.
  • the flow regulating valve includes a valve body and a valve head, the valve body has a valve port, the inner wall of the valve port has a first conical surface, and the end of the valve head has a rounded corner.
  • the valve head is movably arranged in the valve body to close or open the valve port; when the valve port is closed, the rounded corner abuts the first conical surface.
  • a rounded corner structure is provided at the end of the valve head, and the valve port is sealed by the abutment of the rounded corner and the first conical surface. The rounded corner structure can reduce the wear during contact, improve the reliability of the seal and the service life of the flow regulating valve.
  • FIG. 1 shows a schematic structural diagram of a flow regulating valve provided in Embodiment 1 of the present application
  • FIG. 2 shows a schematic structural diagram of the flow regulating valve provided in the second embodiment of the present application
  • Fig. 3 shows a partial enlarged view of the flow regulating valve in Fig. 2;
  • Figure 4 shows a perspective view of the flow regulating valve in Figure 2;
  • FIG. 5 shows a schematic diagram of the flow characteristic curve of the flow regulating valve in FIG. 2 .
  • valve body 11, first tapered surface; 12, second tapered surface; 20, valve head; 21, fillet; 22, end face; 30, guide sleeve; 40, driving part.
  • an embodiment of the present application provides a flow regulating valve, comprising: a valve body 10 , the valve body 10 has a valve port, and the inner wall of the valve port has a first conical surface 11 ; a valve head 20 , the end of the valve head 20 has a fillet 21, the valve head 20 is movably arranged in the valve body 10 to close or open the valve port; when the valve port is closed, the fillet 21 and the first conical surface 11 Abut.
  • a rounded corner 21 is provided at the end of the valve head 20 , and the valve port is sealed by the abutment of the rounded corner 21 and the first tapered surface 11 .
  • the use of the rounded corners 21 can reduce the wear during contact, improve the reliability of the seal and the service life of the flow regulating valve.
  • the radius of the fillet 21 is R, 0.1 mm ⁇ R ⁇ 1.0 mm.
  • the radius of the fillet 21 is set to the above range, which is convenient for processing and has a good sealing effect.
  • the outer peripheral surface of the valve head 20 is a cylindrical surface, and the included angle between the cylindrical surface and the first tapered surface 11 is A, where A ⁇ 10°. In this way, after the valve port is closed, the gap between the outer peripheral surface of the valve head 20 and the first conical surface 11 is very small, which improves the sealing effect and reduces internal leakage.
  • the distance between the larger diameter end of the first conical surface 11 and the end surface 22 of the valve head 20 is L, L ⁇ 2mm.
  • the flow characteristic curve is the relationship between the flow rate of the flow control valve and the valve opening (that is, the moving distance of the valve head).
  • the inner wall of the valve port further has a second conical surface 12 , and the end of the second conical surface 12 with a smaller diameter is connected to the end of the first conical surface 11 with a larger diameter.
  • the angle between the generatrix of the first conical surface 11 and the radial plane of the valve body 10 is a
  • the angle between the generatrix of the second conical surface 12 and the radial plane of the valve body 10 is b , where a>b.
  • the valve body 10 has an accommodating cavity, the valve port communicates with the accommodating cavity, and the valve head 20 is movably disposed in the accommodating cavity. Furthermore, the valve body 10 has a flow port on the side wall, and when the valve port is opened, the valve port communicates with the flow port through the accommodating chamber. When the valve port is closed, the valve port and the flow port are disconnected.
  • the flow regulating valve further includes: a guide sleeve 30 disposed in the valve body 10, the valve head 20 is movably disposed in the guide sleeve 30, and the guide sleeve 30 can guide the valve head 20, so that the valve The head 20 moves smoothly.
  • the flow regulating valve further includes a driving part 40 which is drivingly connected with the valve head 20 to drive the valve head 20 to move.
  • the driving part 40 can be driven by electromagnetic driving.
  • the flow regulating valve is an electronic expansion valve, or other forms of flow regulating valve.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lift Valve (AREA)
  • Sliding Valves (AREA)

Abstract

一种流量调节阀，包括：阀体（10），阀体（10）具有阀口，阀口的内壁具有第一锥形面（11）；阀头（20），阀头（20）的端部具有圆角（21），阀头（20）可移动地设置在阀体（10）内，以关闭或打开阀口；阀口在关闭的情况下，圆角（21）和第一锥形面（11）抵接。阀口的内壁还具有第二锥形面（12），第二锥形面（12）的直径小的一端和第一锥形面（11）的直径大的一端连接。

Description

流量调节阀 技术领域
本申请涉及流量调节阀技术领域，具体而言，涉及一种流量调节阀。
背景技术
在流量调节阀中，通过阀头在阀体内的移动来打开或关闭阀口。现有技术中，通常是阀头端部的周缘和阀口的内壁接触形成密封面，从而实现密封以关闭阀口。然而，阀头的密封面为尖角，易磨损，影响密封可靠性以及流量调节阀的使用寿命。
发明内容
本申请提供了一种流量调节阀，以减少阀头的磨损，提高阀口的密封可靠性。
为了实现上述目的，本申请提供了一种流量调节阀，包括：阀体，所述阀体具有阀口，所述阀口的内壁具有第一锥形面；阀头，所述阀头的端部具有圆角，所述阀头可移动地设置在所述阀体内，以关闭或打开所述阀口；所述阀口在关闭的情况下，所述圆角和所述第一锥形面抵接。
采用该方案，在阀头的端部设置圆角，通过圆角和第一锥形面的抵接实现对阀口的密封。采用圆角可减少在接触时的磨损，提高了密封的可靠性以及流量调节阀的使用寿命。
进一步地，所述圆角的半径为R，0.1mm≤R≤1.0mm。将圆角的半径设置为上述范围，便于加工，并且密封效果好。
进一步地，所述阀头的外周面为圆柱面，所述圆柱面和所述第一锥形面之间的夹角为A，A≤10°。这样阀口关闭后，阀头的外周面和第一锥形面之间的缝隙很小，提高了密封效果，减少内漏。
进一步地，所述阀口在关闭的情况下，所述第一锥形面的直径大的一端和所述阀头的端面之间的距离为L，L≤2mm。
进一步地，所述阀口的内壁还具有第二锥形面，所述第二锥形面的直径小的一端和所述第一锥形面的直径大的一端连接。通过设置第二锥形面，在打开或关闭阀口的过程中，流量特性曲线呈折线形，从而满足了一些情况下的使用需求。
进一步地，所述第一锥形面的母线和所述阀体的径向平面之间的夹角为a，所述第二锥形面的母线和所述阀体的径向平面之间的夹角为b，其中，a＞b。通过上述设置，阀头在打开或关闭阀口的过程中，阀头的外壁和阀口的内壁之间的流通面积变化呈折线形，从而流量特性曲线呈折线形。
进一步地，所述阀体具有容纳腔，所述阀口和所述容纳腔连通，所述阀头可移动地设置在所述容纳腔内。
进一步地，所述阀体的侧壁上具有流通口，所述阀口打开的情况下，所述阀口和所述流通口连通。阀口关闭的情况下，阀口和流通口断开。
进一步地，所述流量调节阀还包括：导向套，设置在所述阀体内，所述阀头可移动地设置在所述导向套内；驱动部，所述驱动部和所述阀头驱动连接，以驱动所述阀头移动。导向套可对阀头进行引导，以使阀头平稳移动。驱动部可采用电磁驱动的方式。
进一步地，所述流量调节阀为电子膨胀阀，或者为其他形式的流量调节阀。
应用本申请的技术方案，提供了一种流量调节阀，流量调节阀包括阀体和阀头，阀体具有阀口，阀口的内壁具有第一锥形面；阀头的端部具有圆角，阀头可移动地设置在阀体内，以关闭或打开阀口；阀口在关闭的情况下，圆角和第一锥形面抵接。采用该方案，在阀头的端部设置圆角结构，通过圆角和第一锥形面的抵接实现对阀口的密封。采用圆角结构可减少在接触时的磨损，提高了密封的可靠性以及流量调节阀的使用寿命。
附图说明
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1示出了本申请的实施例一提供的流量调节阀的结构示意图；
图2示出了本申请的实施例二提供的流量调节阀的结构示意图；
图3示出了图2中的流量调节阀的局部放大图；
图4示出了图2中的流量调节阀的立体图；
图5示出了图2中的流量调节阀的流量特性曲线示意图。
其中，上述附图包括以下附图标记：
10、阀体；11、第一锥形面；12、第二锥形面；20、阀头；21、圆角；22、端面；30、导向套；40、驱动部。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本申请及其应用或使用的任何限制。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
如图1至图5所示，本申请的实施例提供了一种流量调节阀，包括：阀体10，阀体10具有阀口，阀口的内壁具有第一锥形面11；阀头20，阀头20的端部具有圆角21，阀头20可移动地设置在阀体10内，以关闭或打开阀口；阀口在关闭的情况下，圆角21和第一锥形面11抵接。
采用该方案，在阀头20的端部设置圆角21，通过圆角21和第一锥形面11的抵接实现对阀口的密封。采用圆角21可减少在接触时的磨损，提高了密封的可靠性以及流量调节阀的使用寿命。
具体地，圆角21的半径为R，0.1mm≤R≤1.0mm。将圆角21的半径设置为上述范围，便于加工，并且密封效果好。
在本实施例中，阀头20的外周面为圆柱面，圆柱面和第一锥形面11之间的夹角为A，A≤10°。这样阀口关闭后，阀头20的外周面和第一锥形面11之间的缝隙很小，提高了密封效果，减少内漏。
在本实施例中，阀口在关闭的情况下，第一锥形面11的直径大的一端和阀头20的端面22之间的距离为L，L≤2mm。
流量特性曲线是流量调节阀的流量和阀口开度(也即阀头的移动距离)的关系。进一步地，在另一实施例中，阀口的内壁还具有第二锥形面12，第二锥形面12的直径小的一端和第一锥形面11的直径大的一端连接。通过设置第二锥形面12，在打开或关闭阀口的过程中，流量特性曲线呈折线形，从而满足了一些情况下的使用需求。
具体地，第一锥形面11的母线和阀体10的径向平面之间的夹角为a，第二锥形面12的母线和阀体10的径向平面之间的夹角为b，其中，a＞b。通过上述设置，阀头20在打开或关闭阀口的过程中，阀头20的外壁和阀口的内壁之间的流通面积变化呈折线形，从而流量特性曲线呈折线形。
在本实施例中，阀体10具有容纳腔，阀口和容纳腔连通，阀头20可移动地设置在容纳腔内。而且，阀体10的侧壁上具有流通口，阀口打开的情况下，阀口通过容纳腔和流通口连通。阀口关闭的情况下，阀口和流通口断开。
在本实施例中，流量调节阀还包括：导向套30，设置在阀体10内，阀头20可移动地设置在导向套30内，导向套30可对阀头20进行引导，以使阀头20平稳移动。流量调节阀还包括驱动部40，驱动部40和阀头20驱动连接，以驱动阀头20移动。驱动部40可采用电磁驱动的方式。
具体地，流量调节阀为电子膨胀阀，或者为其他形式的流量调节阀。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种流量调节阀，其特征在于，包括：
    阀体(10)，所述阀体(10)具有阀口，所述阀口的内壁具有第一锥形面(11)；
    阀头(20)，所述阀头(20)的端部具有圆角(21)，所述阀头(20)可移动地设置在所述阀体(10)内，以关闭或打开所述阀口；所述阀口在关闭的情况下，所述圆角(21)和所述第一锥形面(11)抵接。
  2. 根据权利要求1所述的流量调节阀，其特征在于，所述圆角(21)的半径为R，
    0.1mm≤R≤1.0mm。
  3. 根据权利要求2所述的流量调节阀，其特征在于，所述阀头(20)的外周面为圆柱面，所述圆柱面和所述第一锥形面(11)之间的夹角为A，A≤10°。
  4. 根据权利要求1所述的流量调节阀，其特征在于，所述阀口在关闭的情况下，所述第一锥形面(11)的直径大的一端和所述阀头(20)的端面(22)之间的距离为L，L≤2mm。
  5. 根据权利要求1所述的流量调节阀，其特征在于，所述阀口的内壁还具有第二锥形面(12)，所述第二锥形面(12)的直径小的一端和所述第一锥形面(11)的直径大的一端连接。
  6. 根据权利要求5所述的流量调节阀，其特征在于，所述第一锥形面(11)的母线和所述阀体(10)的径向平面之间的夹角为a，所述第二锥形面(12)的母线和所述阀体(10)的径向平面之间的夹角为b，
    其中，a＞b。
  7. 根据权利要求1所述的流量调节阀，其特征在于，所述阀体(10)具有容纳腔，所述阀口和所述容纳腔连通，所述阀头(20)可移动地设置在所述容纳腔内。
  8. 根据权利要求1所述的流量调节阀，其特征在于，所述阀体(10)的侧壁上具有流通口，所述阀口打开的情况下，所述阀口和所述流通口连通。
  9. 根据权利要求1所述的流量调节阀，其特征在于，所述流量调节阀还包括：
    导向套(30)，设置在所述阀体(10)内，所述阀头(20)可移动地设置在所述导向套(30)内；
    驱动部(40)，所述驱动部(40)和所述阀头(20)驱动连接，以驱动所述阀头(20)移动。
  10. 根据权利要求1所述的流量调节阀，其特征在于，所述流量调节阀为电子膨胀阀。
PCT/CN2021/121855 2020-10-12 2021-09-29 流量调节阀 WO2022078220A1 (zh)

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