WO2012048659A1 - 一种电动阀 - Google Patents

一种电动阀 Download PDF

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Publication number
WO2012048659A1
WO2012048659A1 PCT/CN2011/080797 CN2011080797W WO2012048659A1 WO 2012048659 A1 WO2012048659 A1 WO 2012048659A1 CN 2011080797 W CN2011080797 W CN 2011080797W WO 2012048659 A1 WO2012048659 A1 WO 2012048659A1
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WO
WIPO (PCT)
Prior art keywords
valve
seat
nut
needle
edge portion
Prior art date
Application number
PCT/CN2011/080797
Other languages
English (en)
French (fr)
Inventor
魏先让
Original Assignee
浙江三花股份有限公司
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=45937908&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2012048659(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from CN2010105152341A external-priority patent/CN102454818A/zh
Priority claimed from CN201010515238XA external-priority patent/CN102454819B/zh
Priority claimed from CN201110184918.2A external-priority patent/CN102853086B/zh
Application filed by 浙江三花股份有限公司 filed Critical 浙江三花股份有限公司
Priority to JP2013533085A priority Critical patent/JP5716980B2/ja
Priority to KR1020137012475A priority patent/KR101455952B1/ko
Priority to CN201180049855.8A priority patent/CN103261766B/zh
Publication of WO2012048659A1 publication Critical patent/WO2012048659A1/zh

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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
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor

Definitions

  • the present invention relates to the field of control valves, and more particularly to an electric valve for regulating fluid flow.
  • the electric valve usually includes a valve seat assembly, a nut assembly, a needle screw assembly, and a rotor assembly.
  • the valve seat assembly generally includes a valve seat, a valve seat and a connecting tube, and the valve seat has a valve port, a valve seat, a valve seat and a connection.
  • the tube is typically welded integrally to form a valve seat assembly, and the valve needle of the needle screw assembly is mounted within the nut of the nut assembly.
  • valve needle and the valve port are not easy to occur.
  • the coaxial phenomenon causes the valve port to be tightly sealed or the valve port to be eccentrically worn, so that the reliability of the action of the electric valve is low, and the service life of the electric valve is also shortened.
  • the valve seat assembly including a valve seat having a valve chamber and a valve port fixed to the valve seat a spool seat assembly
  • the valve stem screw assembly includes a lead screw and a valve needle driven by the lead screw
  • the nut assembly includes a nut and a connecting piece, and the connecting piece is fixed to the valve seat; a nut threadedly engaged with the lead screw, the nut having a nut lower guide section, the valve needle having a lower guide section, the spool seat having a first guide section and a mating portion with the lower guide section of the nut
  • the second guiding section of the lower guiding section of the valve needle cooperates.
  • the first guiding section of the spool seat is disposed at an outer edge portion or an inner edge portion of a side of the spool seat opposite to the valve port, and correspondingly the lower portion of the nut is guided a segment is disposed at an inner edge portion or an outer edge portion of the nut in cooperation with the first guiding portion of the valve core seat to position the valve core seat and the nut;
  • the outer edge portion or the inner edge portion of the valve core seat opposite to the valve port has a step portion
  • the first guide portion is an outer edge portion or an inner edge portion a cylindrical outer wall portion opposite to the upper portion of the step portion or an inner wall portion of the circular hole;
  • the inner edge portion of the valve core seat on the opposite side from the valve port has a step portion
  • the second guide portion is a valve portion in the inner edge portion of the step portion relatively close to the valve An inner wall portion of the inner hole on one side of the mouth
  • the valve core seat is provided with a valve core accommodating chamber, the second guiding portion of the valve core seat is disposed at an inner edge portion of the accommodating chamber, and the lower portion of the valve needle is guided The segment is placed at the outer edge of the valve needle.
  • the valve needle includes a lower guiding portion and a valve needle segment engaged with the valve port, and the second guiding portion of the valve core seat is opposite to the lower guiding portion of the valve needle
  • the valve needle is slidably disposed in the housing cavity of the spool seat.
  • the electric valve according to the above configuration is further provided with an opening connecting the receiving chamber and the valve chamber.
  • the nut further includes a threaded portion that cooperates with the screw rod on an opposite side of the lower guide portion thereof, and has an engagement with the screw rod at an upper end or a lower end of the threaded portion.
  • Lead screw guide section is a threaded portion that cooperates with the screw rod on an opposite side of the lower guide portion thereof, and has an engagement with the screw rod at an upper end or a lower end of the threaded portion.
  • the screw rod and the valve needle are elastically coupled by a spring.
  • the electric valve of the above configuration is further provided with a valve needle sleeve between the screw rod and the valve needle, the valve needle sleeve is fixedly connected with the valve needle, and the screw rod passes through the valve needle sleeve It enters the inner cavity of the valve needle and abuts directly or indirectly with the spring.
  • the electric valve provided by the present invention, the needle screw assembly and the nut are all provided with a guiding section that cooperates with the valve core seat, and cooperates with the valve core seat through the guiding section. Since the first guide portion and the second guide portion of the spool seat and the valve port on the spool seat can be simultaneously formed or molded by a mold to ensure the tolerance and accuracy of the relative position, the nut and the valve needle are obtained.
  • FIG. 1 is a schematic structural view of a specific embodiment of an electric valve according to the present invention
  • FIG. 2 is an external view of the nut assembly and a cross-sectional side view of the shaft;
  • Figure 3 is an outline view of the valve core seat and a cross-sectional side view of the shaft;
  • Figure 4 is a schematic view showing the structure of another electric valve according to another embodiment of the present invention
  • Figure 5 is an external view of the nut assembly and a cross-sectional side view of the shaft
  • Figure 6 is an outline view of the valve plug seat and a side view of the shaft side. The symbols in the figure indicate:
  • FIG. 1 is a schematic structural view of a specific embodiment of an electric valve according to the present invention
  • FIG. 2 is an outline view of the nut assembly and a cross-sectional view of the shaft
  • FIG. 3 is an external view of the spool seat and a cross-sectional view of the shaft side. Please refer to Figure 1, Figure 2 and Figure 3.
  • the electric valve provided by the present invention includes a valve seat assembly, a nut assembly, a valve stem screw assembly, and a rotor assembly.
  • the valve seat assembly includes a spool seat 11 and a valve seat 12.
  • a valve port 113 is also formed on the spool seat 11, and the valve seat 12 has a substantially cylindrical structure with a fitting hole with the spool seat at the bottom, and a valve chamber 121 is formed inside.
  • the valve seat assembly further includes a first connecting pipe 13 and a second connecting pipe 14.
  • the spool seat 11, the valve seat 12, the first connecting pipe 13, and the second connecting pipe 14 are integrally connected to form a valve seat assembly.
  • the valve core seat 11, the valve seat 12, the first connecting pipe 13, and the second connecting pipe 14 may be integrally connected by welding, or may be integrally formed.
  • the nut assembly includes a nut 32 and a connecting piece 31.
  • the connecting piece 31 is integrally formed as an insert with a nut 32.
  • the connecting piece 31 is welded and fixed to the valve seat 12, and the nut 32 is threaded through the upper end. Threaded with the threaded rod 23.
  • a guide section 321 is provided at an inner edge portion of the lower portion of the nut 32.
  • a screw guiding section 322 is provided which cooperates with the screw rod 23, and the screw guiding section 322 can be disposed on the upper side or the lower side of the threaded section of the nut 32 which is engaged with the threaded rod 23, Conducive to the guiding of the screw when rotating.
  • the outer circumference of the upper portion of the nut 32 is fitted with a spring guide 33 and a stop slip ring 34.
  • the valve needle screw assembly includes a screw rod 23 and a valve needle 21 driven by the screw rod 23.
  • the valve needle screw assembly further includes a valve needle sleeve 22, a damper 24, a spring 25, and a valve needle 21
  • the valve needle sleeve 22 is integrally connected, and the valve needle 21 and the valve needle sleeve 22 can be integrally connected by welding, interference and pressure fitting, etc., the head of the screw rod 23 is provided with a dam 24, and the dam 24 can be welded, The interference pressure matching and the like are set with the screw rod 23, and the screw rod 23 is fitted in the inner hole of the valve needle 21.
  • the inner hole of the valve needle 21 is further provided with a spring 25, and the end of the screw rod 23 can abut against the spring 25.
  • the screw 23 is elastically connected to the valve needle 21.
  • the outer edge portion of the valve needle 21 has a guide portion 211.
  • the rotor assembly includes a rotor 41, a rotor stopper 42 and a joint connecting the two, and the rotor assembly is fixed to the upper end of the screw shaft 23.
  • the electric valve further includes a casing 5, and the casing 5 is fitted on the valve seat 12 for sealing the valve body.
  • a stepped portion is provided on the outer edge portion of the valve body seat 11, and the upper side of the step portion provided on the outer edge portion of the valve core seat 11 is a cylindrical outer wall portion away from the valve port direction side as the first aspect of the present invention.
  • the guiding section 111, the first guiding section 111 of the valve core seat 11 is engaged with the lower guiding section 321 of the nut 32.
  • the two may be a transition, an interference or a small clearance fit, and the valve core seat 11 and the nut 32 are cooperatively positioned. . This ensures the coaxiality between the spool seat 11 and the nut 32, and further cooperates with the guide section provided between the spool seat 11 and the valve needle to ensure the coaxiality of the needle and the nut.
  • the valve needle screw assembly has upper and lower guiding respectively, so that the valve port and the valve with the valve core seat The concentricity between the needles is more easily ensured, avoiding the problem of poor valve seal or eccentric wear of the valve port.
  • a spool receiving chamber 114 is further disposed on the spool seat 11, and a second guiding portion 112 is disposed at an inner edge portion of the receiving chamber 114.
  • An opening 115 connecting the receiving chamber 114 and the valve chamber 121 is further disposed on the spool seat 11.
  • the second guide section 112 of the spool seat 11 cooperates with the guide section 211 of the valve needle.
  • Valve needle 21 It is slidably disposed in the housing cavity 114 of the spool seat 11 in the axial direction.
  • the electric valve provided by the invention firstly screwes the valve needle screw assembly and the nut, and at the same time, the guiding end and the needle guiding section of the lower end of the nut are respectively axially slid and the first guiding section and the first part of the valve core seat
  • the two guide segments are fitted in place and the nut assembly is secured to the valve seat by welding the tab to the valve seat. Since the first guide portion and the second guide portion of the spool seat and the valve port on the spool seat can be simultaneously formed or molded by a mold to ensure the tolerance and accuracy of the relative position, the nut and the valve needle are obtained.
  • the coaxiality between the screw assembly and the valve port of the valve plug seat is easily ensured, avoiding the problem that the valve port is not tightly sealed or the valve port is eccentrically worn; at the same time, the coaxiality between the valve needle and the valve port is obtained.
  • the frictional force is significantly reduced, and the operational reliability of the electric valve is also improved.
  • the "inner edge portion” or "outer edge portion” as used in the present invention refers to the axial inner edge portion of the hole or the axial outer edge portion of the shaft, such as In this embodiment, it is an axial inner circular surface or an axial outer circular surface of the hole of the nut.
  • FIG. 4 is a schematic structural view of another embodiment of an electric valve according to the present invention
  • FIG. 5 is an outline view of the nut assembly and a cross-sectional view of the shaft
  • FIG. 6 is an external view of the spool seat and a cross-sectional view of the shaft side. Please refer to Figure 4, Figure 5 and Figure 6.
  • This embodiment is different from the foregoing embodiment in that a guide portion 321 is provided at the outer edge portion of the lower portion of the nut 32; the outer edge portion of the valve needle 21 has a guide portion 211.
  • a circular step portion is provided on an inner edge portion of the valve core seat 11, and a stepped portion having a large hole diameter, that is, an inner wall portion of the inner edge portion of the valve core seat 11 opposite to the upper portion is provided with a first guide portion 111
  • the first guiding section 111 of the valve core seat 11 cooperates with the guiding section 321 of the nut 32 to coordinately position the valve core seat 11 and the nut 32; the second guiding section 112 is provided on the step surface with a small aperture, and the inner hole is provided therein.
  • the spool receiving cavity 114 is formed, and the second guiding section 112 of the spool seat 11 cooperates with the guiding section 211 of the valve needle, so that the valve needle 21 can be slidably disposed in the receiving cavity 114 of the spool seat 11 in the axial direction. .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Lift Valve (AREA)

Description

一种电动阀 本申请要求下列专利申请的优先权， 其全部内容均通过引用结合在本 申请中：
1、 2010年 10月 15 日提交中国专利局、 申请号为 201010515234.1、 发明名称为"一种电动阀 "的中国专利申请；
2、 2010年 10月 15 日提交中国专利局、 申请号为 201010515238.X、 发明名称为"电动阀及其止动装置 "的中国专利申请；
3、 2011年 7月 1 日提交中国专利局、 申请号为 201110184918.2、 发 明名称为 "一种电动阀装置"的中国专利申请。
技术领域
本发明涉及控制阀技术领域， 尤其涉及一种用于调节流体流量的电动 阀。
背景技术
在空调、 冰箱、 热泵热水器及各类制冷、 制热设备中， 通常采用电动 阀调节流体的流量。
电动阀通常包括阀座组件、 螺母组件、 阀针丝杆组件， 转子组件， 阀 座组件通常包括阀芯座、 阀座及连接管， 阀座上具有阀口， 阀芯座、 阀座 及连接管通常焊接成一体构成阀座组件， 阀针丝杆组件的阀针安装在螺母 组件的螺母内。
特许文献（特开 2010-25932号公报）公开了一种电动阀， 螺母组件的 螺母固定在导向套筒内， 导向套筒固定在阀座上， 阀针又需要固定在阀座 的阀口内， 因此对阀座与螺母的同轴度要求较高， 上述电动阀需要经过多 次组装工序间接控制才能保证阀芯座与螺母的同轴度， 而且阀座与螺母的 同轴度受到螺母、 导向套筒、 阀座、 阀针等多个零件的加工精度的影响， 同轴度不易保证， 如果出现阀芯座与螺母不同轴， 容易出现阀针与阀口不 同轴现象， 进而造成阀口密封不严或阀口出现偏心磨损的问题， 从而使得 电动阀的动作的可靠性较低， 也会缩短电动阀的使用寿命。
因此， 如何研发出一种满足阀座组件、 螺母组件和阀针丝杆组件同轴 度较高的电动阀， 成为本领域技术人员亟待解决的技术难题。 发明内容
本发明的目的是提供一种电动阀， 包括阀座组件、 螺母组件、 阀针丝 杆组件， 所述阀座组件包括设有阀腔的阀座和固定在所述阀座上的带阀口 的阀芯座， 所述阀针丝杆组件包括丝杆和由所述丝杆带动的阀针； 所述螺 母组件包括螺母和连接片， 所述连接片与所述阀座固接； 所述螺母与所述 丝杆螺纹配合， 所述螺母具有螺母下部导向段， 所述阀针具有下部导向段， 所述阀芯座具有与所述螺母的下部导向段配合的第一导向段和与所述阀针 的下部导向段配合的第二导向段。
优选地， 如上述结构的电动阀， 所述阀芯座的第一导向段设置在阀芯 座离阀口反向的一侧的外缘部或内缘部， 相应地所述螺母的下部导向段与 所述阀芯座的第一导向段相配合地设置在螺母的内缘部或外缘部， 使所述 阀芯座与所述螺母配合定位；
优选地， 如上述结构的电动阀， 所述阀芯座的离阀口反向的一侧的外 缘部或内缘部具有台阶部， 所述第一导向段为外缘部或内缘部台阶部中相 对上部的圓柱状的外壁部或圓孔的内壁部；
优选地， 如上述结构的电动阀， 所述阀芯座的离阀口反向的一侧的内 缘部具有台阶部， 所述第二导向段为所述内缘部台阶部中相对靠近阀口一 侧的内孔的内壁部；
优选地， 如上述结构的电动阀， 所述阀芯座设有阀芯容纳腔， 所述阀 芯座的第二导向段设置在所述容纳腔的内缘部， 所述阀针的下部导向段设 置在阀针的外缘部。
优选地， 如上述结构的电动阀， 所述阀针包括下部导向段和与所述阀 口配合的阀针段， 所述阀芯座的第二导向段与所述阀针的下部导向段相配 合， 使所述阀针可沿轴向滑动地设置在所述阀芯座的容纳腔中。 优选地， 如上述结构的电动阀， 所述阀芯座上还设置有连接所述容纳 腔与所述阀腔的开口。
优选地， 如上述结构的电动阀， 所述螺母在其下部导向段的相反侧还 包括有与所述丝杆配合的螺纹段， 在螺紋段的上端或下端还具有与所述丝 杆配合的丝杆导向段。
优选地，如上述结构的电动阀，所述丝杆与所述阀针之间通过弹簧弹性 连接。
优选地，如上述结构的电动阀，所述丝杆与所述阀针之间还设置有阀针 套， 阀针套与所述阀针固定连接， 所述丝杆穿过所述阀针套进入所述阀针 的内腔中并与所述弹簧直接或间接相抵接。
本发明提供的电动阀， 阀针丝杆组件和螺母都设置有与阀芯座配合的 导向段， 通过导向段与阀芯座配合。 由于阀芯座的第一导向部和第二导向 部及阀芯座上的阀口， 都可以同时一次性加工成型或采用模具成型， 以保 证相对位置的公差要求和精度， 使得螺母和阀针丝杆组件及阀芯座的阀口 之间同轴度极易得到保证， 避免出现阀口密封不严或阀口出现偏心磨损的 问题； 同时， 由于阀针与阀口的同轴度得到了提高， 转子组件的转子转动 时的摩擦力会明显减小， 电动阀的动作可靠性也会提高。
附图说明
图 1 本发明所提供的一种电动阀具体实施例的结构示意图； 图 2 图 1中螺母组件的外形图及轴侧剖视图；
图 3 图 1中阀芯座的外形图及轴侧剖视图；
图 4 本发明所提供的另一种电动阀具体实施例的结构示意图； 图 5 图 4中螺母组件的外形图及轴侧剖视图；
图 6 图 4中阀芯座的外形图及轴侧剖视图。 图中符号说明：
II-阀芯座；
III-第一导向段、 112-第二导向段; 113-阀口、 114容纳腔、 115-开口;
12-阀座、 121-阀腔;
13-第一连接管、 14-第二连接管；
21-阀针、 211-导向段；
22-阀针套、 23-丝杆；
24-挡圏、 25-弹簧；
31-连接片；
32-螺母；
321-导向段、 322-丝杆导向段；
33-弹簧导轨、 34-滑环；
41—转子、 42-转子止动部；
5-外壳。
具体实施方式
为了使本领域的技术人员更好的理解本发明的技术方案， 下面结合附 图和具体实施方式对本发明作进一步的详细说明。
图 1为本发明所提供的一种电动阀具体实施例的结构示意图； 图 2为 螺母组件的外形图及轴侧剖视图； 图 3为阀芯座的外形图及轴侧剖视图。 请参看图 1、 图 2和图 3。
本发明提供的电动阀包括阀座组件、 螺母组件、 阀针丝杆组件及转子 组件。
阀座组件包括阀芯座 11和阀座 12。 阀芯座 11上还加工有阀口 113 , 阀座 12为底部带有与阀芯座配合孔的大致筒状结构，其内部形成阀腔 121。 在本实施例中， 阀座组件还进一步包括第一连接管 13和第二连接管 14。 阀芯座 11、 阀座 12、 第一连接管 13、 第二连接管 14连接成一体形成阀座 组件。 当然， 阀芯座 11、 阀座 12、 第一连接管 13、 第二连接管 14可以通 过焊接连接成一体， 也可以一体成型。
螺母组件包括螺母 32和连接片 31 , 连接片 31作为嵌件与螺母 32— 体成型，连接片 31与阀座 12焊接固接，所述螺母 32通过上端设置的螺纹 与丝杆 23螺纹配合。 在螺母 32下部的内缘部设置有导向段 321。 在螺母 32的上部的内孔中，设置有与丝杆 23配合的丝杆导向段 322,丝杆导向段 322可以设置在螺母 32的与丝杆 23配合螺紋段的上侧或下侧， 以有利于 丝杆转动时的导向。 螺母 32的上部的外圓周套装有弹簧导轨 33和止动滑 环 34。
阀针丝杆组件包括丝杆 23和由丝杆 23带动的阀针 21 ,在本实施例中， 阀针丝杆组件还进一步包括阀针套 22、 挡圏 24、 弹簧 25 , 阀针 21与阀针 套 22连接成一体， 阀针 21与阀针套 22具体可以通过焊接、过盈压配等方 式连接成一体， 丝杆 23的头部套装有挡圏 24, 挡圏 24可以通过焊接、 过 盈压配等方式与丝杆 23套装， 丝杆 23卡装在阀针 21的内孔中， 阀针 21 内孔中还设有弹簧 25 , 丝杆 23的端部可抵靠弹簧 25。 丝杆 23与阀针 21 之间为弹性连接。 阀针 21的外缘部具有导向段 211。
转子组件包括转子 41、 转子止动部 42和连接二者的连接体， 转子组 件固定在丝杆 23的上端。
具体方案中， 电动阀还包括外壳 5 , 外壳 5套装在阀座 12上， 用于密 封阀体。
在阀芯座 11的外缘部上设置有台阶部， 阀芯座 11的外缘部上设置的 台阶部的相对上侧即远离阀口方向侧的圓柱状的外壁部作为本发明的第一 导向段 111 ,阀芯座 11的第一导向段 111与螺母 32的下部导向段 321配合， 具体地， 两者可以是过渡、 过盈或小间隙配合， 使阀芯座 11与螺母 32配 合定位。 这样可以使阀芯座 11与螺母 32之间的同轴度得到保证， 并进一 步结合阀芯座 11与阀针之间设置的导向段的配合，使阀针与螺母的同轴度 得以保证。 然后再结合螺母上设置的与阀针丝杆组件上的丝杆配合导向的 丝杆导向段 322, 使阀针丝杆组件分别具有上、 下导向， 从而使具有阀芯 座的阀口与阀针之间同轴度更易得到保证， 避免出现阀口密封不严或阀口 出现偏心磨损的问题。
在阀芯座 11上还设有阀芯容纳腔 114, 在容纳腔 114的内缘部设置有 第二导向段 112。 在阀芯座 11上还设置有连接容纳腔 114与阀腔 121的开 口 115。 阀芯座 11的第二导向段 112与阀针的导向段 211配合。 使阀针 21 可沿轴向滑动地设置在所述阀芯座 11的容纳腔 114中。
本发明提供的电动阀， 先将阀针丝杆组件与螺母螺合， 再同时使螺母下端 设置的导向端和阀针导向段分别轴向滑动的与阀芯座上的第一导向段和第 二导向段配合安装到位， 然后通过将连接片与阀座进行焊接的方式， 将螺 母组件固定在阀座上。 由于阀芯座的第一导向部和第二导向部及阀芯座上 的阀口， 都可以同时一次性加工成型或采用模具成型， 以保证相对位置的 公差要求和精度， 使得螺母和阀针丝杆组件及阀芯座的阀口之间的同轴度 极易得到保证，避免出现阀口密封不严或阀口出现偏心磨损的问题； 同时， 由于阀针与阀口的同轴度得到了提高， 转子组件的转子转动时的摩擦力会 明显减小， 电动阀的动作可靠性也会提高。 应该指出的是，本领域的技术人员可以理解， 本发明所说的 "内缘部" 或 "外缘部"， 是指的孔的轴向内缘部或轴的轴向外缘部， 如在本实施例中 为螺母的孔的轴向内圓面或轴向外圓面。
图 4为本发明所提供的一种电动阀另一种具体实施例的结构示意图； 图 5为螺母组件的外形图及轴侧剖视图； 图 6为阀芯座的外形图及轴侧剖 视图。 请参看图 4、 图 5和图 6。
该实施例与前述实施例不同点在于，在螺母 32下部的外缘部设置有导 向段 321; 阀针 21的外缘部具有导向段 211。
在阀芯座 11的内缘部上设置有圓形台阶部，其孔径较大的台阶面上即 阀芯座 11的内缘部上相对上部的圓孔的内壁部设置有第一导向段 111 , 阀 芯座 11的第一导向段 111与螺母 32的导向段 321配合，使阀芯座 11与螺 母 32配合定位； 其孔径较小的台阶面上设置有第二导向段 112, 其内孔则 形成阀芯容纳腔 114, 阀芯座 11的第二导向段 112与阀针的导向段 211配 合， 使阀针 21可沿轴向滑动地设置在所述阀芯座 11的容纳腔 114中。
以上所述仅是发明的优选实施方式的描述， 应当指出， 本发明说明书 中的上、 下、 内、 外等方位用词只是为了说明清楚一些， 不应视作对本发 明的限制。 由于文字表达的有限性， 而在客观上存在无限的具体结构， 对 于本技术领域的普通技术人员来说， 在不脱离本发明原理的前提下， 还可 以做出若干改进和润饰， 这些改进和润饰也应视为本发明的保护范围。

Claims

权 利 要 求
1、 一种电动阀， 包括阀座组件、 螺母组件、 阀针丝杆组件， 所述阀座 组件包括设有阀腔 (121)的阀座 (12)和固定在所述阀座 (12)上的带阀口（113) 的阀芯座 (11) , 所述阀针丝杆组件包括丝杆 (23)和由所述丝杆 (23)带动的阀 针 (21); 所述螺母组件包括螺母 (32)和连接片（31);
所述连接片（31)与所述阀座 (12)固接； 所述螺母 (32)与所述丝杆 (23)螺 纹配合；
所述螺母 (32)具有螺母下部导向段 (321), 所述阀针 (21)具有下部导向 段 (211), 所述阀芯座 (11)具有与所述螺母的下部导向段 (321)配合的第一导 向段 (111)和与所述阀针的下部导向段 (211)配合的第二导向段 (112)。
2、 根据权利要求 1所述的电动阀， 其特征在于， 所述阀芯座 (11)的第 一导向段 (111)设置在阀芯座 (11)离阀口反向的一侧的外缘部或内缘部， 相 应地所述螺母 (32)的下部导向段 (321) 与所述阀芯座（11) 的第一导向段
(111)相配合地设置在螺母 (32)的内缘部或外缘部，使所述阀芯座 (11)与所述 螺母 (32)配合定位。
3、 根据权利要求 2所述的电动阀， 其特征在于， 所述阀芯座 (11)的离 阀口反向的一侧的外缘部或内缘部具有台阶部， 所述第一导向段 (111)为外 缘部或内缘部台阶部中相对上部的圓柱状的外壁部或圓孔的内壁部。
4、 根据权利要求 3所述的电动阀， 其特征在于， 所述阀芯座 (11)的离 阀口反向的一侧的内缘部具有台阶部， 所述第二导向段 (112) 为所述内缘 部台阶部中相对靠近阀口一侧的内孔的内壁部。
5、 根据权利要求 1所述的电动阀， 其特征在于， 所述阀芯座 (11)设有 阀芯容纳腔（114) , 所述阀芯座（11)的第二导向段 (112)设置在所述容纳腔 (114)的内缘部， 所述阀针 (21)的下部导向段 (211)设置在阀针 (21)的外缘部。
6、 根据权利要求 5所述的电动阀， 其特征在于， 所述阀针 (21)包括下 部导向段 (211)和与所述阀口配合的阀针段， 所述阀芯座 (11)的第二导向段
( 112)与所述阀针 (21 )的下部导向段 (211 )相配合， 使所述阀针 (21 )可沿轴向 滑动地设置在所述阀芯座 (11)的容纳腔 (114)中。
7、根据权利要求 1-6所述的任一电动阀，其特征在于，所述阀芯座 (11) 上还设置有连接所述容纳腔 (114)与所述阀腔 (121)的开口（115)。
8、根据权利要求 1-6所述的任一电动阀，其特征在于，所述螺母 (32) 在 其下部导向段的相反侧还包括有与所述丝杆 (23)配合的螺纹段， 在螺纹段 的上端或下端还具有与所述丝杆 (23)配合的丝杆导向段 (322)。
9、 根据权利要求 1-6 所述的任一电动阀， 其特征在于， 所述丝杆 (23) 与所述阀针 (21)之间通过弹簧 (25)弹性连接。
10、 根据权利要求 9所述的电动阀， 其特征在于， 所述丝杆 (23)与所 述阀针 (21)之间还设置有阀针套（ 22 ) , 阀针套（ 22 )与所述阀针固定连接， 所述丝杆穿过所述阀针套（22 )进入所述阀针（21 ) 的内腔中并与所述弹 簧 (25)直接或间接相抵接。
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