WO2018188500A1 - 电子膨胀阀 - Google Patents

电子膨胀阀 Download PDF

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Publication number
WO2018188500A1
WO2018188500A1 PCT/CN2018/081703 CN2018081703W WO2018188500A1 WO 2018188500 A1 WO2018188500 A1 WO 2018188500A1 CN 2018081703 W CN2018081703 W CN 2018081703W WO 2018188500 A1 WO2018188500 A1 WO 2018188500A1
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WO
WIPO (PCT)
Prior art keywords
screw
valve
resistant coating
spring
contact
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Application number
PCT/CN2018/081703
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English (en)
French (fr)
Inventor
周磊
蔡江南
陆颖翀
Original Assignee
杭州三花研究院有限公司
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Application filed by 杭州三花研究院有限公司 filed Critical 杭州三花研究院有限公司
Priority to EP18784643.1A priority Critical patent/EP3611409A4/en
Priority to US16/603,916 priority patent/US11703258B2/en
Priority to JP2019555223A priority patent/JP2020513097A/ja
Publication of WO2018188500A1 publication Critical patent/WO2018188500A1/zh

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    • 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
    • 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
    • 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
    • F16K1/50—Preventing rotation of 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • 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 invention relates to a flow control valve, in particular to an electronic expansion valve.
  • an electronic expansion valve including a valve member and a stator member; the valve member including a valve body assembly, a valve core, a screw drive assembly, and a rotor, the valve body assembly being provided a valve port, the valve core being capable of controlling the opening of the valve port by the screw drive assembly; the contact surface of at least one component between the at least one moving member of the electronic expansion valve is provided with wear resistance a coating, the abrasion resistant coating is applied by spraying, the abrasion resistant coating has a thickness of 5 to 8 micrometers, and the material of the wear resistant coating comprises a molybdenum disulfide material and a polytetrafluoroethylene material.
  • the invention is coated with a wear-resistant coating comprising a molybdenum disulfide material and a polytetrafluoroethylene material on the contact surface of the relatively moving parts of the electronic expansion valve, which is advantageous for reducing the relative motion.
  • the wear is beneficial to reduce the frictional resistance and to improve the service life of the electronic expansion valve.
  • FIG. 1 is a schematic cross-sectional structural view showing a first embodiment of an electronic expansion valve of the present invention
  • Figure 2 is a schematic view showing the combined structure of some components in Figure 1;
  • Figure 3 is a schematic view showing the combined structure of the valve seat and the nut of Figure 2;
  • Figure 4 is a schematic view showing the combined structure of the valve core, the screw and the rotor of Figure 2;
  • Figure 5 is a schematic structural view of the screw of Figure 2;
  • Figure 6 is a schematic view showing the structure of the spool of Figure 2;
  • the electronic expansion valve is used to control the flow rate of the refrigerant, and the control of the superheat of the system is achieved by adjusting the flow rate of the refrigerant.
  • the electronic expansion valve controls the flow rate of the refrigerant based on the electric signal control opening degree.
  • electronic expansion valves are increasingly used as throttle elements in the fields of automotive air conditioning systems, heat pump systems, and battery cooling systems.
  • the electronic expansion valve 100 includes a valve member 10 and a stator member 20, and the stator member 20 is fixedly coupled to the valve member 10;
  • the valve member 10 includes a valve body assembly 1, a spool 2, a screw drive assembly 3, and
  • the rotor 4 the valve body assembly 1 is provided with a valve port, and the valve core 2 can control the opening degree of the valve port under the driving of the screw drive assembly 3;
  • the screw drive assembly 3 includes a screw 31 and a nut 32, and the screw 31 is connected with the rotor 4, and the screw 31 drives the valve core 2 to move, the nut 32 is fixed to the fixed portion of the valve member 10, the screw 31 and the nut 32 are screwed, and the screw 31 moves relative to the nut 32, thereby driving the valve core 2 to move up and down, thereby controlling the valve port.
  • the contact surface of at least one of the relatively moving parts is coated with an abrasion resistant coating, and the wear resistant coating is applied by spraying, and the material of the wear resistant coating comprises molybdenum disulfide material and polytetrafluoroethylene material, wear resistant coating thickness
  • the thickness of the material is 5 to 8 micrometers, so that the coating property, abrasion resistance and cost can be achieved in a reasonable range.
  • the wear-resistant coating is provided to reduce the wear of the relatively moving parts and to lubricate and reduce the frictional resistance. Function, compared with the use of lubricating oil, the wear-resistant coating is more uniform and does not change with pressure, can better improve the wear resistance, is beneficial to improve the service life of the relatively moving parts, and thus improve the service life of the electronic expansion valve.
  • the valve body assembly 1 includes a valve seat 11 and a valve body 12, the valve port is formed on the valve seat 11, and the circulation passage is formed in the valve body 12, and the valve core 2 changes the opening of the valve port to change the working of the circulation passage.
  • the flow rate of the medium, the valve seat 11 and the valve body 12 are separately formed and fixedly connected, which is advantageous for simplifying the forming process of the valve body.
  • the relatively moving component includes at least the external thread portion 312 of the screw 31 and the internal thread portion 323 of the nut 32, the valve port of the valve seat 11 and the valve core 2, the valve core 2 and the nut 32, at least one of the components
  • the opposite moving surface is coated with a wear-resistant coating, and the wear-resistant coating is applied by spraying.
  • the material of the wear-resistant coating comprises molybdenum disulfide material and polytetrafluoroethylene material, and the wear-resistant coating layer has a thickness of 5 to 8 micrometers. The coating properties, wear resistance and cost of such materials can reach a reasonable range.
  • the screw 31 and the valve core 2 are coated with a wear-resistant coating, and of course, the corresponding component may be coated with a wear-resistant coating.
  • the nut 32 is fixedly connected to the valve seat 11 , the valve seat 11 is fixedly connected with the valve body 12 , and the fixed portion of the nut 32 relative to the valve body 1 , that is, the valve seat 11 fixed connection.
  • the nut 32 includes an inner side wall 321 including at least an upper guiding portion 322, an inner threaded portion 323 and a lower guiding portion 324.
  • the inner side wall 321 forms a nut inner cavity 325, and the nut inner cavity 325 has a diameter at the upper guiding portion 322.
  • the diameter of the nut inner cavity at the inner thread portion 323 is larger than the diameter at the lower guide portion 324
  • the upper guide portion 322 is used for guiding the screw 31, and the internal thread portion 323 and the external thread of the screw
  • the portion 312 is screwed
  • the lower guide portion 324 is used for guiding the valve body 2
  • the upper portion of the nut, the inner threaded portion 322, the inner threaded portion 323 and the lower guide portion 324 can be coated with a wear-resistant coating, so that the nut can be raised.
  • the wear resistance of the three sections in 32 is beneficial to increase the service life of the nut 32.
  • the inner side wall 321 of the nut may also be uniformly sprayed with a wear resistant coating. It is of course also possible to apply a wear-resistant coating on the corresponding positions of the screw and the spool of the upper section 322, the internal threaded part 323 and the lower section 324 of the corresponding nut.
  • the screw 31 includes a rotor fixing portion 311, a male screw portion 312, and a valve core connecting portion 313.
  • the rotor fixing portion 311 of the screw 31 is injection-molded with the rotor 4, and in this embodiment, the rotor is fixed.
  • the portion 311 and the external thread portion 312 are disposed on the outer circumference of the screw 31, the valve core fixing portion 313 is connected to the valve body 2, and the external thread portion 312 is coated with a wear-resistant coating to improve the wear resistance of the screw and improve the service life of the screw.
  • the service life of the electronic expansion valve is increased; the outer peripheral surface of the screw 31 between the rotor fixing portion 311 and the male screw portion 312 is coated with a wear-resistant coating, so that the relative movement of the upper guide portion of the screw and the nut can be improved. Wear resistance of the screw; of course, the upper guide portion of the nut may also be coated with a wear-resistant coating, and the outer peripheral surface of the screw between the rotor fixing portion 311 and the external thread portion 312 is not coated with a wear-resistant coating, or the nut upper guide portion and The screw is coated with an abrasion resistant coating on the outer circumferential surface between the rotor fixing portion 311 and the external thread portion 312.
  • the spool 2 includes a first end portion 21, a second end portion 22, and a body portion 23.
  • the first end portion 21 is adjacent to and includes a first end
  • the second end portion 22 is adjacent to and includes a second end
  • One end portion 21 is connected to the screw 31
  • the second end portion 22 is for controlling the opening degree of the valve port
  • the main body portion 23 is disposed between the first end portion 21 and the second end portion 22, and the portion of the main body portion 23 and the nut 32 is
  • the lower guiding portion 324 is oppositely disposed, and the first end portion 21, the second end portion 22, and the portion of the main body portion 23 corresponding to the lower guiding portion 324 are coated with a wear-resistant coating to increase the wear resistance of the valve core, of course.
  • the entire surface of the valve plug may also be coated with a wear resistant coating for ease of coating; it is of course also possible to have a corresponding screw with the first end portion 21, the second end portion 22 and the portion of the body portion 23 with the lower guide portion 324.
  • the portion of the valve seat is coated with a wear-resistant coating, or the first end portion 21, the second end portion 22, and the portion of the main body portion 23 and the lower guide portion 324 and the corresponding screw and valve seat are coated with a wear-resistant coating.
  • the valve member 10 includes a connecting sleeve 6, and the screw 31 and the spool 2 are limited by the connecting sleeve 6.
  • the first end portion 21 of the valve body 2 includes an annular groove 211, a flange portion 212, a step portion 213, and a first end 214.
  • An annular groove 211 is formed between the flange portion 212 and the step portion 213, and the annular groove 211 is formed.
  • the diameter of the flange portion 212 is smaller than the diameter of the step portion 213, the diameter of the flange portion 212 is larger than the diameter of the step portion, the diameter of the connecting sleeve 6 is larger than the diameter of the step portion 213, the diameter of the connecting sleeve 6 is smaller than the diameter of the flange portion 212, and the annular groove 211 is used.
  • the sleeve portion 212 limits the movement of the connecting sleeve to the first end 214.
  • the connecting sleeve 6 is sleeved from the second end to the outer circumference of the valve core and is received in the annular groove 211, and then the connecting sleeve 6 is The screw 31 is press-fitted and interference fit, and the connecting sleeve 6 is fixedly connected with the screw 31.
  • the annular groove 211 and the flange portion 212 of the valve core 2 corresponding to the connecting sleeve 6 are coated with a wear-resistant coating, which can improve The wear resistance of the spool 2 increases the service life of the spool 2; of course, it is also possible to apply a wear-resistant coating to the portion of the connecting sleeve 6 corresponding to the annular groove 211 and the flange portion 212, or the The annular groove 211 and the flange portion 212 corresponding to the connecting sleeve 6 and the corresponding connecting sleeve 6 are coated Abrasion resistant coating.
  • a spring 7 is disposed between the screw 31 and the spool 2, and the screw 31 is formed with a screw lumen 314.
  • the first end portion 214 of the spool 2 extends into the screw lumen 314, and the first end 214 and the spring 7
  • the contact portion is disposed, and the flange portion 212 is pressed against the end surface of the connecting sleeve 6 by the spring 7.
  • the spring 7 thus disposed can serve as a buffer when the second end portion 22 of the valve body 2 contacts the valve seat 11, protecting the spool
  • the service life of the valve core is improved; the first end 214 is coated with a wear-resistant coating, which can reduce the friction between the first end and the spring, and reduce the rotation of the valve core 2 with the spring 7, further reducing the relative position of the valve core 2
  • the impact at the valve port of the valve seat 11 increases the service life of the valve seat 11 and the spool 12.
  • the valve body assembly 10 further includes a cover body 5 that separates the stator component 20 from the rotor 4, the stator component 20 is disposed on the outer circumference of the cover body 5, and the rotor 4 is disposed in the inner cavity of the cover body 5, and the cover
  • the body 5 is fixedly disposed with the valve seat 11, which prevents the working medium from coming into contact with the stator member 20 and prevents the working medium from corroding the stator member.
  • the cover body 5 and the valve seat 11 are fixedly fixed by welding, which is advantageous for improving the sealing property, and may of course be fixed by other means, such as a screw connection or the like.
  • the electronic expansion valve of the present invention may also be of other structure.
  • a spring is arranged between the screw and the valve core, the valve core is formed with a valve core cavity, the spring is disposed in the inner cavity of the valve core, and one end of the spring is in direct or indirect contact with the screw, and the spring is The other end is in direct or indirect contact with the valve core, at least one of the contact portion of the spring with the valve plug and one of the contact portion of the valve core with the spring is coated with a wear-resistant coating and/or at least a spring contact with the screw and the screw One of the contacts with the spring is coated with a wear resistant coating.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Sliding Valves (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

一种电子膨胀阀（100），包括阀部件（10）和定子部件（20）；阀部件包括阀体组件（1）、阀芯（2）、螺纹传动组件（3）以及转子（4），阀体组件设置有阀口，阀芯在所述螺纹传动组件的带动下能够控制所述阀口的开度；至少电子膨胀阀的相对运动的部件之间的一个部件的接触面设置有耐磨涂层，耐磨涂层通过喷涂的方式进行涂覆，耐磨涂层厚度为5至8微米，耐磨涂层的材料包括二硫化钼材料与聚四氟乙烯材料；这样设置的耐磨涂层有利于减少磨损，提高电子膨胀阀的使用寿命。

Description

电子膨胀阀
本申请要求于2017年04月12日提交中国专利局、申请号为201710234824.9、发明名称为“电子膨胀阀”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种流量控制阀，具体涉及一种电子膨胀阀。
背景技术
在制冷系统中，电子膨胀阀主要用于调节制冷剂的流量。随着对流量控制精度的要求的提高，电子膨胀阀逐渐应用于汽车空调系统、热泵系统以及电池冷却系统中。
电子膨胀阀在运行的过程中，各相对运动的零部件之间存在着磨损以及摩擦阻力的情况，进而导致电子膨胀阀的使用寿命以及效率受到影响。
因此，有必要对现有的技术进行改进，以解决以上技术问题。
发明内容
本发明的目的在于提供一种电子膨胀阀，有利于减少相对运动的部件之间的摩擦，进而提高其使用寿命。
为实现上述目的，本发明采用如下技术方案：一种电子膨胀阀，包括阀部件和定子部件；所述阀部件包括阀体组件、阀芯、螺纹传动组件以及转子，所述阀体组件设置有阀口，所述阀芯在所述螺纹传动组件的带动下能够控制所述阀口的开度；所述电子膨胀阀的至少相对运动的部件之间的至少一个部件的接触面设置有耐磨涂层，所述耐磨涂层通过喷涂的方式进行涂覆，所述耐磨涂层厚度为5至8微米，所述耐磨涂层的材料包括二硫化钼材料和聚四氟乙烯材料。
与现有技术相比，本发明通过在电子膨胀阀的相对运动的部件的接触面涂覆有包括二硫化钼材料和聚四氟乙烯材料的耐磨涂层，有利于减小因相对运动产生的磨损，有利于减小摩擦阻力，并有利于提高电子膨胀阀的使用寿命。
附图说明
图1是本发明的电子膨胀阀的第一种实施方式的一个截面结构示意图；
图2是图1中的部分零部件的组合结构示意图；
图3是图2中阀座与螺母的组合结构示意图；
图4是图2中阀芯与螺杆以及转子的组合结构示意图；
图5是图2中螺杆的结构示意图；
图6是图2中阀芯的结构示意图。
具体实施方式
下面结合附图和具体实施例对本发明作进一步说明：
在制冷系统中，电子膨胀阀用来控制制冷剂的流量，通过对制冷剂流量的调节达到对系统过热度的控制作用，电子膨胀阀是基于电信号控制开度来控制制冷剂的流量。为了提高流量的控制精度，汽车空调系统、热泵系统以及电池冷却系统等领域逐渐使用电子膨胀阀作为节流元件。
参见图1，本实施例中，电子膨胀阀100包括阀部件10和定子部件20，定子部件20与阀部件10固定连接；阀部件10包括阀体组件1、阀芯2、螺纹传动组件3以及转子4，阀体组件1设置有阀口，阀芯2在螺纹传动组件3的带动下能够控制阀口的开度；螺纹传动组件3包括螺杆31和螺母32，螺杆31与转子4连接，螺杆31带动阀芯2移动，螺母32与阀部件10中固定不动的部分相固定，螺杆31和螺母32螺纹配合，螺杆31相对于螺母32运动，进而带动阀芯2上下移动，进而控制阀口的开度。至少相对运动的部件之一的接触面涂覆有耐磨涂层，耐磨涂层通过喷涂涂覆，耐磨涂层的材料包括二硫化钼材料和聚四氟乙烯材料，耐磨涂层厚度为5至8微米，这样材料的涂覆性、耐磨性均以及成本能达到合理的范围，这样设置的耐磨涂层有利于减少相对运动的部件的磨损并起到润滑和降低摩擦阻力的作用，相对于使用润滑油，耐磨涂层更加均匀且不会随压力变化，能更好的提高耐磨性，有利于提高相对运动的部件的使用寿命，进而提高电子膨胀阀的使用寿命。
本实施例中，阀体组件1包括阀座11和阀主体12，阀口成形于阀座11，流通通道成形于阀主体12，阀芯2通过控制阀口的开度，改变流通通道的工作介质的流量，阀座11与阀主体12分别成形并固定连接，这样有利于简化阀体的成形工艺。
本实施例中，相对运动的部件至少包括螺杆31的外螺纹部312与螺母32的内螺纹部323、阀座11的阀口处与阀芯2、阀芯2与螺母32，至少其中一个部件的相对运动面涂覆有耐磨涂层，耐磨涂层通过喷涂涂覆，耐磨涂层的材料包括二硫化钼材料与聚四氟乙烯材料，耐磨涂层厚度为5至8微米，这样材料的涂覆性、耐磨性均以及成本能达到合理的范围。本实施例中，螺杆31和阀芯2涂覆有耐磨涂层，当然也可以在相对应的部件涂覆耐磨涂层。
结合参见图1、图2以及图3，本实施例中，螺母32与阀座11固定连接，阀座11与阀主体12固定连接，螺母32相对于阀体1的固定的部分，即阀座11固定连接。螺母32包括内侧壁321，内侧壁321包括至少上导向部322，内螺纹部323以及下导向部324三段，内侧壁321形成螺母内腔325，螺母内腔325在上导向部322处的口径大于在内螺纹部323处的口径，螺母内腔在内螺纹部323处的口径大于在下导向部324处的口径，上导向部322用于螺杆31的导向，内螺纹部323与螺杆的外螺纹部312螺纹连接，下导向部324用于阀芯2的导向，在螺母的上导向部322，内螺纹部323以及下导向部324三段均可以涂覆有耐磨涂层，这样可以提高螺母32在三段的耐磨性，有利于提高螺母32的使用寿命。为了提高螺母32的涂覆的工艺性，也可以将螺母的内侧壁321均匀喷涂耐磨涂层。当然也可以在对应螺母的上导向部322，内螺纹部323以及下导向部324三段的螺杆和阀芯的对应位置涂覆耐磨涂层。
结合参见图2、图4以及图5，螺杆31包括转子固定部311、外螺纹部312以及阀芯连接部313，螺杆31的转子固定部311与转子4注塑固定，本实施例中，转子固定部311和外螺纹部312设置于螺杆31的外周，阀芯固定部313与阀芯2连接，外螺纹部312涂覆有耐磨涂层，提高螺杆的耐磨性，提高螺杆的使用寿命，进而提高电子膨胀阀的使用寿命；在转子固 定部311和外螺纹部312之间的螺杆31的外周面涂覆有耐磨涂层，这样在螺杆与螺母的上导向部相对运动时，可以提高螺杆的耐磨性；当然也可以螺母的上导向部涂覆耐磨涂层，螺杆在转子固定部311和外螺纹部312之间外周面不涂覆耐磨涂层，或者螺母上导向部和螺杆在转子固定部311和外螺纹部312之间的外周面均涂覆耐磨涂层。
结合参见图6，阀芯2包括第一端部21、第二端部22以及主体部23，第一端部21靠近并包括第一末端，第二端部22靠近并包括第二末端，第一端部21与螺杆31连接，第二端部22用于控制阀口的开度，主体部23设置于第一端部21和第二端部22之间；部分主体部23与螺母32的下导向部324相对设置，第一端部21、第二端部22以及主体部23的与下导向部324对应的部分均涂覆有耐磨涂层，以增加阀芯的耐磨性，当然为了涂覆方便也可以将阀芯的整个表面涂覆耐磨涂层；当然也可以在与第一端部21、第二端部22以及主体部23的与下导向部324部分的对应的螺杆、阀座的部位涂覆耐磨涂层，或者第一端部21、第二端部22以及主体部23的与下导向部324部分以及对应的螺杆和阀座的部位均涂覆耐磨涂层。
本实施方式中，参见图1、图2以及图4，阀部件10包括连接套6，螺杆31与阀芯2通过连接套6限位。阀芯2的第一端部21包括环形凹槽211、凸缘部212、台阶部213以及第一末端214，凸缘部212和台阶部213之间形成环形凹槽211，环形凹槽211的直径小于台阶部213的直径，凸缘部212的直径大于台阶部的直径，连接套6的口径大于台阶部213的直径，连接套6的口径小于凸缘部212的直径，环形凹槽211用于容置连接套6，凸缘部212限制连接套向第一末端214移动，连接套6自第二端部套设于阀芯的外周并容置于环形凹槽211，然后连接套6与螺杆31压装并过盈配合，进而连接套6与螺杆31固定连接，其中阀芯2的与连接套6对应的环形凹槽211和凸缘部212涂覆有耐磨涂层，这样可以提高阀芯2的耐磨性，提高阀芯2的使用寿命；当然也可以在与环形凹槽211和凸缘部212对应的连接套6的部位涂覆耐磨涂层，或者阀芯2的与连接套6对应的环形凹槽211和凸缘部212以及与之对应的连接套6的部位均涂覆耐磨涂层。
本实施例中，螺杆31和阀芯2之间设置有弹簧7，螺杆31成形有螺杆内腔314，阀芯2的第一端部214伸入螺杆内腔314，第一末端214与弹簧7接触设置，并且凸缘部212通过弹簧7压于连接套6的端面，这样设置的弹簧7在阀芯2的第二端部22与阀座11接触时能够起到缓冲的作用，保护阀芯，提高阀芯的使用寿命；第一末端214涂覆有耐磨涂层，这样可以减少第一末端与弹簧之间的摩擦，减少阀芯2随着弹簧7的转动，进一步减少阀芯2相对于阀座11的阀口处的冲击，提高阀座11和阀芯12的使用寿命。
本实施例中，阀体组件10还包括罩体5，罩体5将定子部件20和转子4隔离，定子部件20设置于罩体5的外周，转子4设置于罩体5的内腔，罩体5与阀座11固定设置，这样可以防止工作介质与定子部件20接触，防止工作介质腐蚀定子部件。本实施例中，罩体5与阀座11固定设置通过焊接固定，这样有利于提高密封性，当然也可以通过其它方式固定，比如：螺纹连接等。
本发明的电子膨胀阀也可以为其他结构，螺杆和阀芯之间设置有弹簧，阀芯成形有阀芯内腔，弹簧设置于阀芯内腔，弹簧一端与螺杆直接或间接接触，弹簧的另一端与阀芯直接或间接接触，至少弹簧的与阀芯的接触部和阀芯的与弹簧的接触部之一涂覆有耐磨涂层和/或者至少弹簧的与螺杆的接触部和螺杆的与弹簧的接触部之一涂覆有耐磨涂层。
需要说明的是：以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。

Claims (10)

  1. 一种电子膨胀阀，包括阀部件和定子部件；所述阀部件包括阀体组件、阀芯、螺纹传动组件以及转子，所述阀体组件设置有阀口，所述阀芯在所述螺纹传动组件的带动下能够控制所述阀口的开度；其特征在于：所述电子膨胀阀的至少相对运动的部件之间的至少一个部件的接触面设置有耐磨涂层，所述耐磨涂层通过喷涂的方式进行涂覆，所述耐磨涂层厚度为5至8微米，所述耐磨涂层的材料包括二硫化钼材料和聚四氟乙烯材料。
  2. 根据权利要求1所述的电子膨胀阀，其特征在于：所述螺纹传动组件包括螺杆和螺母，所述螺杆与所述转子固定连接，所述螺杆带动所述阀芯运动，所述螺母与所述阀体组件中固定不动的部分相固定，所述螺杆包括外螺纹部，所述螺母包括内螺纹部，所述外螺纹部和所述内螺纹部螺纹配合，至少所述外螺纹部和所述内螺纹部之一涂覆有所述耐磨涂层。
  3. 根据权利要求2所述的电子膨胀阀，其特征在于：所述螺母还包括下导向部，所述下导向部设置于所述内螺纹部以下，所述下导向部的口径小于所述内螺纹部的口径，所述下导向部用于对所述阀芯的运动导向，至少所述下导向部与所述阀芯的对应于所述下导向部的部分的外表面之一涂覆有所述耐磨涂层。
  4. 根据权利要求3所述的电子膨胀阀，其特征在于：所述螺母包括内侧壁，所述内侧壁形成所述螺母内腔，所述内螺纹部和所述下导向部均成形于所述内侧壁，所述内侧壁还包括所述螺杆贯穿的上导向部，所述下导向部和所述上导向部分别位于所述内螺纹部的两侧，所述上导向部的口径大于所述内螺纹部的口径，所述上导向部涂覆有所述耐磨涂层
  5. 根据权利要求2至4任一项所述的电子膨胀阀，其特征在于：所述阀部件还包括连接套，所述螺杆和所述阀芯通过所述连接套相对限位，所述螺杆与所述连接套过盈配合，所述螺杆设置限位部，所述连接套设置于所述限位部，至少所述阀芯的与所述连接套接触的部位和所述连接套的与所述阀芯接触的部分之一涂覆有所述耐磨涂层。
  6. 根据权利要求5所述的电子膨胀阀，其特征在于：所述螺杆和所述阀芯之间还设置有弹簧，所述弹簧分别与所述螺杆和所述阀芯直接或间接 接触设置，至少所述阀芯的与所述弹簧接触的部位和所述弹簧与所述阀芯接触的部位涂覆有所述耐磨涂层。
  7. 根据权利要求6所述的电子膨胀阀，其特征在于：所述螺杆包括螺杆内侧壁，所述内侧壁围绕形成螺杆内腔，所述弹簧设置于所述螺杆内腔，所述弹簧一端与所述螺杆接触，所述弹簧的另一端与所述阀芯的顶部接触，至少所述弹簧的与所述阀芯的顶部的接触部和所述阀芯的顶部之一涂覆有所述耐磨涂层。
  8. 根据权利要求6所述的电子膨胀阀，其特征在于：所述阀芯设置有阀芯内腔，所述弹簧设置于所述阀芯内腔，所述弹簧一端与所述螺杆直接或间接接触，所述弹簧的另一端与所述阀芯直接或间接接触，至少所述弹簧的与所述阀芯的接触部和所述阀芯的与所述弹簧的接触部之一涂覆有所述耐磨涂层或者至少所述弹簧的与所述螺杆的接触部和所述螺杆的与所述弹簧的接触部之一涂覆有所述耐磨涂层。
  9. 根据权利要求7或8所述的电子膨胀阀，其特征在于：所述螺杆包括与所述转子固定的转子固定部，所述转子固定部以下的所述螺杆的外表面涂覆所述耐磨涂层。
  10. 根据权利要求5所述的电子膨胀阀，其特征在于：至少所述阀芯的与所述阀口处的所述阀体组件的接触的部位和所述阀体组件的在所述阀口处与所述阀芯的接触的部位之一涂覆有所述耐磨涂层。
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