WO2019196063A1 - 电子膨胀阀 - Google Patents

电子膨胀阀 Download PDF

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Publication number
WO2019196063A1
WO2019196063A1 PCT/CN2018/082863 CN2018082863W WO2019196063A1 WO 2019196063 A1 WO2019196063 A1 WO 2019196063A1 CN 2018082863 W CN2018082863 W CN 2018082863W WO 2019196063 A1 WO2019196063 A1 WO 2019196063A1
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WO
WIPO (PCT)
Prior art keywords
valve
screw
electronic expansion
nut
expansion valve
Prior art date
Application number
PCT/CN2018/082863
Other languages
English (en)
French (fr)
Inventor
曾庆军
陈勇好
林崇卫
Original Assignee
浙江盾安禾田金属有限公司
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 浙江盾安禾田金属有限公司 filed Critical 浙江盾安禾田金属有限公司
Priority to JP2020543093A priority Critical patent/JP7089041B2/ja
Priority to KR1020207025965A priority patent/KR102335760B1/ko
Priority to PCT/CN2018/082863 priority patent/WO2019196063A1/zh
Publication of WO2019196063A1 publication Critical patent/WO2019196063A1/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
    • 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
    • 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

Definitions

  • the invention relates to the field of valve technology, and in particular to an electronic expansion valve.
  • An electronic expansion valve for regulating a refrigerant flow rate in a refrigeration system such as an air conditioner includes a valve body member and a coil, and a valve needle opening degree in the valve body member is driven by the coil to adjust a flow rate of a refrigerant in the refrigeration system, thereby achieving temperature control. effect.
  • FIG. 1 An electronic expansion valve (Fig. 1) is disclosed in the Chinese invention patent application (Application No. 201010515234.1), which is composed of a valve seat assembly, a nut assembly, a valve needle screw assembly and a rotor assembly.
  • the intake pipe 14 is sleeved in the side hole of the valve seat 12, the air outlet pipe 13 is press-fitted on the protruding side of the valve seat core 11, and then the valve seat assembly is completed by furnace welding.
  • the nut assembly is manufactured by the connecting plate 31 first injection molding the nut in the injection molding machine, then the limit spring 33 and the retaining ring 34 are set, and finally the laser is welded to the valve seat.
  • the needle screw assembly is assembled by the valve needle 21 spring 25 bushing 24 press sleeve 22 steel ball and the screw rod 23 by a total of six parts.
  • the rotor assembly is interspersed by the magnetic rotor 41 and the guide piece 42.
  • the lasers are welded together and then assembled to the valve needle screw assembly and then laser welded.
  • the casing and the valve seat are welded by laser welding to complete the valve body.
  • the object of the present invention is to provide an electronic expansion valve, which simplifies the assembly process, reduces the use of parts, has fewer quality control points, has fewer processes, improves production efficiency, and reduces costs.
  • an electronic expansion valve comprising:
  • Screw assembly including a screw
  • a rotor assembly comprising a nut nested outside the screw, a limiter disposed on the outer ring of the nut top, and a magnetic rotor sleeved on the outer ring of the nut, the outer peripheral wall of the nut being provided with at least one first a bonding surface, wherein the inner peripheral wall of the magnetic rotor is provided with at least one second bonding surface that is matched with the first bonding surface, and the first bonding surface is adhered to the surface of the second bonding surface
  • an electronic expansion valve comprising:
  • valve seat assembly including a valve seat, a first connecting pipe connected to one side of the valve seat, and a second connecting pipe connected to a lower portion of the valve seat;
  • a screw assembly including a screw mounted on the valve seat
  • valve needle assembly including a valve needle disposed within the screw
  • a valve cavity connecting the first connecting pipe and the second connecting pipe is disposed inside the valve seat assembly, and a first valve port is disposed in a communication between the valve cavity and the second connecting pipe, and the valve cavity is inside the valve cavity
  • the function simplifies the system control, reduces the use of parts, and simplifies the assembly process, reduces the number of processes, improves the production efficiency and reduces the cost.
  • an electronic expansion valve comprising:
  • Screw assembly including a screw
  • a rotor assembly including a nut nested outside the screw, a limiter disposed on an outer ring of the nut top, and a magnetic rotor sleeved on the outer ring of the nut, the nut and/or the screw
  • a limiting member for preventing the circumferential movement of the nut and the screw, and the blocking action of the limiting member can prevent the relative displacement rotation between the nut and the screw, thereby improving the reliability of the operation of the electronic expansion valve. It simplifies the assembly process, improves production efficiency, and reduces production costs.
  • Figure 1 is a schematic view showing the structure of an electronic expansion valve in the prior art
  • Figure 2 is a schematic cross-sectional view showing an electronic expansion valve in an embodiment of the present invention
  • FIG. 3 is a schematic cross-sectional structural view showing a rotor assembly of an electronic expansion valve in an embodiment of the present invention
  • FIG. 4 is a schematic cross-sectional structural view showing an inner hole of a nut of an electronic expansion valve in an embodiment of the present invention
  • FIG. 5 is a schematic structural view showing a nut of an electronic expansion valve in an embodiment of the present invention.
  • FIG. 6 is a schematic structural view showing a screw of an electronic expansion valve in an embodiment of the present invention.
  • FIG. 7 is a schematic view showing the structure of a screw of an electronic expansion valve before injection molding according to an embodiment of the present invention.
  • FIG. 8 is a schematic cross-sectional structural view showing a magnetic rotor of an electronic expansion valve in an embodiment of the present invention.
  • FIG. 9 is a schematic structural view showing a limiter of an electronic expansion valve in an embodiment of the present invention.
  • FIG. 10 is a schematic structural view showing a magnetic rotor of an electronic expansion valve in an embodiment of the present invention.
  • Figure 11 is a schematic view showing the structure of a magnetic rotor of another electronic expansion valve in the embodiment of the present invention.
  • Figure 12 is a schematic enlarged view of the portion A in Figure 11;
  • Figure 13 is a schematic cross-sectional view showing another electronic expansion valve in an embodiment of the present invention.
  • Figure 14 is a schematic enlarged partial view showing a portion A of Figure 13;
  • FIG. 15 is a schematic view showing the structure of a pilot valve core in another electronic expansion valve according to an embodiment of the present invention.
  • 16 is a schematic cross-sectional view showing the structure of a pilot valve core in another electronic expansion valve in an embodiment of the present invention.
  • Figure 17 is a schematic view showing the structure of a screw assembly in another electronic expansion valve in the embodiment of the present invention.
  • FIG. 18 is a schematic cross-sectional view showing the structure of the first connecting pipe ventilating the second connecting pipe in another electronic expansion valve in the embodiment of the present invention.
  • Fig. 19 is a schematic cross-sectional view showing the structure of a second connecting pipe for venting the first connecting pipe in another electronic expansion valve in the embodiment of the present invention.
  • an electronic expansion valve includes
  • Screw assembly including screw 6;
  • the rotor assembly comprises a nut 8 nested outside the screw, a limiter 12 disposed on the outer ring of the top of the nut 8, and a magnetic rotor 7 sleeved on the outer ring of the nut 8.
  • the nut 8 can be injection molded by engineering plastic, and the outer circumference of the nut 8
  • At least one first bonding surface 84 is disposed on the wall, and the inner peripheral wall of the magnetic rotor 7 is provided with at least one second bonding surface 73 that is matched with the first bonding surface 84.
  • the first bonding surface 84 is attached to the second surface.
  • the surface of the surface 73 is bonded, and the number of the first bonding surface 84 and the second bonding surface 73 can be the same.
  • the surface contact is convenient for positioning during installation, which simplifies the assembly process, improves the production efficiency, and reduces the production cost.
  • the shapes of the first bonding surface 84 and the second bonding surface 73 are matched, so that a better fit can be performed, and the second bonding surface 73 located on the rib 71 can adopt a plane or a curved surface, corresponding to the first sticker.
  • the joint surface 84 is also a flat surface or a curved surface.
  • the first bonding surface 84 corresponds to a convex surface, and a gap is adopted between the first bonding surface 84 and the second bonding surface 73.
  • Coordination, over-coordination or interference fit is not limited.
  • the first bonding surface 84 is provided with a strip convex in the vertical direction. 85, the operation of the strip-shaped protrusion 85 on the second bonding surface 73 can serve as a guiding and limiting function, when the first bonding surface 84 and the surface of the second bonding surface 73 are attached.
  • the strip-shaped protrusions 85 are received in the recesses 72.
  • the first bonding surface 84 cooperates with the circumferential direction of the fixed magnetic rotor 7.
  • the cooperation of the strip protrusions 85 and the grooves 72 can improve the positioning accuracy of the assembly, and can also reduce the first bonding surface 84 and the second bonding surface 73. The production accuracy and process feasibility.
  • the lengths of the strip-shaped protrusions 85 on each of the first bonding surfaces 84 may be different, and may appear in pairs, and the cooperation relationship between the strip-shaped protrusions 85 and the recesses 72 having a larger size is interference.
  • the fit of the strip-shaped protrusions 85 and the recesses 72 of the smaller size may be a clearance fit, which is not limited thereto.
  • the restrictor 12 is made of a metal foil, a plastic sheet or a rubber sheet, and can be flexibly selected, which is not limited thereto.
  • the top end of the nut 8 is provided with a locking portion 83 and an enlarged portion 81.
  • the diameter of the locking portion 83 is smaller than the diameter of the enlarged portion 81.
  • the limiter 12 includes a circular plate. The portion 121 and the everted member 122, the disc-shaped portion 121 abuts against the end surface 75 of the magnetic rotor 7, and the everted member 122 is sleeved and abutted against the locking portion 83, and the everted member 122 is elastically deformed, and the force card is applied.
  • the buckle is in the locking portion 83.
  • the axial movement of the magnetic rotor 7 can be restricted by the restrictor 12, in particular, the downward movement is restricted, thereby achieving fixation.
  • a cylindrical shape or at least two bent portions may be used, and the locking portion 83 is clamped by the bent portion.
  • four bending portions are symmetrically disposed on the circular plate.
  • the center hole facilitates the passage of the locking portion 83 and the enlarged portion 81.
  • the nut 8 in the embodiment of the present invention has an inner hole for mounting the screw 6, and the inner hole is sequentially provided with a screw guiding section 810, an internal thread section 89, a preloading spring mounting section 88, and a valve needle guiding.
  • Section 82 wherein the inner diameter D1 of the screw guiding section, the small diameter D2 of the internal thread section 89, the inner diameter D3 of the preload spring mounting section 88, and the inner diameter D4 of the needle guide section 82 satisfy D1>D2>D3> D4, in this embodiment, D4 can be 2.09 mm, D3 can be 4.30 mm, D2 can be 4.36 mm, D1 can be 5.18 mm, and the needle guide segment 82 corresponds to a nut hole, and the screw 6 passes through the nut hole.
  • the structure with a progressive inner diameter facilitates the restriction and installation.
  • the screw 6 is sequentially provided with a threaded section 61, a smooth guiding section 62, an injection joint portion 64, a positioning portion 65 and a guiding portion 66, and the injection molding joint portion 64 is provided with a circle in the circumferential direction.
  • the annular groove 63 which is used for the circular groove 63, can facilitate injection molding and increase the strength of the injection molding portion.
  • the side of the injection molding joint portion 64 is provided with a D-shaped opening 67.
  • the D-shaped opening 67 In addition to the shape of the D-shaped opening 67, there may be other shapes, such as a profiled notch, an asymmetrical notch, etc., and the stopper 15 is injection molded.
  • the joint portion 64 is injection-molded on the screw 6, and the D-shaped port 67 is also used to improve the injection molding and increase the strength of the injection molding portion.
  • the circular groove 63 and the D-port 67 structure can be used simultaneously. Adopted separately, this is not limited.
  • the nut 8 further has a stepped surface 86 which can be disposed at the bottom of the nut 8.
  • the stepped surface 86 abuts against the end surface 75 of the rib 71.
  • the stopper 15 is axially The side of the direction is provided with a boss 151, and the bottom of the outer periphery of the nut 8 is provided with a stop boss 87. When the electronic expansion valve is fully closed, the boss 151 abuts against the stop boss 87 to achieve a stop function.
  • the height of the rib 71 is smaller than the height of the magnetic rotor 7 , and the rib 71 is symmetrically distributed along the middle of the magnetic rotor 7 , specifically, the rib 71 Four and equal intervals are provided on the inner peripheral wall of the magnetic rotor 7, and the first abutting surface 84 has four and is evenly distributed on the outer peripheral wall of the nut 8.
  • the sleeve seat 5 and the valve seat are assembled after the interference fit, and then the first connecting tube 1 and the second connecting tube 2 are welded through the tunnel furnace, and the screw assembly is screwed and molded thereon.
  • the stopper block 15 is composed of, in implementation, the screw assembly is inserted into the inner cavity of the valve seat to achieve the fixing, and the nut 8 is set in the magnetic rotor 7 through the four ribs 71 provided in the magnetic rotor 7 The two abutting faces 73 cooperate with the four first abutting faces 84 of the nut 8 to fix the circumferential direction of the magnetic rotor 7.
  • the strip-shaped protrusions 85 and the grooves 72 cooperate to improve the positioning accuracy of the assembly, and at the same time
  • the manufacturing precision of the first bonding surface 84 and the second bonding surface 73 is also reduced, and the process feasibility is improved.
  • the restrictor 12 is attached, and since the bent portion of the restrictor 12 abuts against the lock portion 83, the elastic portion of the bent portion is elastically deformed and fastened to the lock portion 83, and the enlarged portion 81 prevents the restrictor 12 from coming out.
  • the limiting block 9 and the valve needle are fixed by laser welding, and then the return spring 10 is loaded, and then the sleeve 11 is pressed, and the sleeve 11 and the sleeve seat 5 are pressed and fitted. Sealed by continuous laser welding .
  • an electronic expansion valve in another embodiment of the present invention includes
  • valve seat assembly comprising a valve seat 3, a first connecting pipe 1 connected to one side of the valve seat 3, a second connecting pipe 2 connected to a lower portion of the valve seat 3, and a casing seat 5 disposed on the valve seat 3, specifically Then, the sleeve seat 5 and the valve seat 3 are assembled with the welding ring after the interference press, and then the first connecting tube 1 and the second connecting tube 2 are welded through the tunnel furnace.
  • valve needle assembly comprising a valve needle 4 mounted on the screw 6, and a pretension spring 14 sleeved on the valve needle 4;
  • the sleeve assembly comprises a limiting block 9 mounted on the top of the screw 6, a return spring 10 mounted on the limiting block 9, and a sleeve 11 sleeved outside the rotor assembly and connected to the sleeve seat 5;
  • the screw assembly comprises a screw 6 press-fitted on the valve seat, and a stop block 15 mounted on the screw 6.
  • the stop block 15 can be arranged on the screw 6 by injection molding, and when implemented, the screw assembly is The surplus pressure is fixed into the inner cavity of the valve seat 5 to achieve fixing.
  • a valve chamber 55 connecting the first connecting tube 1 and the second connecting tube 2 is disposed inside the valve seat assembly, a first valve port 23 is disposed at a position where the valve chamber 55 communicates with the second connecting tube 2, and a second valve is disposed in the valve chamber 55
  • the pilot valve core 25 of the port 51 is fitted on the valve needle 26 and guided by the valve needle 26.
  • the valve needle 26 guides the valve core 25 against the first valve port 23 and guides Passing the second valve port 51, the first connecting pipe 1 is electrically connected to the second connecting pipe 2 via the second valve port 51; in the second state, the valve needle 26 closing the second valve port 51 and guiding the valve spool 25 is separated from the first valve port 23, and the two-way flow switching control is realized by the pilot valve core 25.
  • the one-way valve function can be realized without providing a plurality of expansion valves, simplifying system control, reducing parts usage, and simplifying. Assembly process, fewer processes, improve production efficiency and reduce costs.
  • the pilot valve core 25 further includes at least one passage for communicating the first connecting pipe 1 and the second valve port 51 on the side wall of the pilot valve core 25.
  • a hole 52 and a guiding portion 53 disposed at the other end of the pilot valve core 25 for being sleeved on the valve needle 26 and guided by the valve needle 5;
  • the second valve port 51 is for communicating with the second connecting tube 2;
  • the segment 53 is fitted over the valve needle 26 and guided by the valve needle 26;
  • the flow hole 52 is disposed in the side wall of the pilot valve core 25 and is used for communicating the first connecting pipe 1 and the second valve port 51;
  • the pilot valve core 25 includes a surrounding One end of the pilot valve core 25 is provided with a tapered surface 54 for abutting against the first valve port 23 and having an outer end surface of a tapered structure;
  • the second valve port 51 and the flow hole 52 constitute a connecting passage.
  • the number of the flow holes 52 may be plural.
  • the flow holes 52 are four, and the four flow holes 52 are evenly distributed on the side wall of the pilot valve core 25. .
  • one end of the valve needle 26 is provided with a valve needle tapered surface 54 for abutting against the second valve opening 51, and the valve needle tapered surface 54 abuts against the second valve opening 51 to achieve the second Sealing of the valve port.
  • the inner diameter D2 of the valve chamber 55 and the inner diameter D1 of the guide section are required to satisfy the relationship of D2 > D1 in order to ensure the flow capacity.
  • the lower end of the screw 6 is provided with a mounting cavity 91 for receiving the valve needle 26 and the guide section 53, and the guide section 53 can reciprocate within the mounting cavity.
  • the screw 6 is provided with a stopper block 15.
  • the bottom end of the nut 8 is provided with a stop boss.
  • the stopper boss cooperates with the stopper block 15 to limit the screw 6, when the valve body When fully closed, excessive compression of the pretension spring 14 can be prevented.
  • the screw 6 is sequentially provided with a threaded section, a smooth guiding section, an injection joint, a positioning part and a guiding section, and a D-shaped opening is arranged on the side of the injection molding joint and a circular groove is arranged in the circumferential direction, the stopper 15 is injection molded onto the screw 6 by the injection molding joint.
  • the stopper 13 and the valve needle 26 are welded together.
  • the valve is opened.
  • the rotor assembly is lifted upward, and is driven by the stopper 13
  • the valve needle 26 is also raised upwards away from the valve port.
  • the pilot valve core 25 can be guided at the valve needle during the ventilation of the first connecting pipe 1 to the second connecting pipe 2.
  • the lower portion is sealed against the first valve port 23 by the tapered surface 54 so that the gas passes through the flow hole 52, the cavity and the second valve port 51, and then enters the second connecting tube 2, and then the tapered surface of the valve needle 26 is adjusted.
  • the spacing between the two valve ports 51, the position of the valve needle 26 can be set by the coil as needed, and the valve needle 26 is raised or lowered by the screw drive. In this working state, the pilot valve core 25 is subjected to its own gravity and high pressure.
  • the tapered surface of the bottom of the pilot valve core 25 is in contact with the first valve port 23, and the flow rate can only flow through the second valve port 51, so that the valve needle 26 controls the flow of the one-way connecting passage, thereby realizing one-way. Control the effect of traffic.
  • the valve needle 26 is first opened, and the pilot valve core is opened by the air flow, so that the tapered surface 54 of the entire pilot valve core 25 is The first valve port 23 is separated, the second valve port is abutted against the tapered surface 61 of the valve needle 26, and the first valve port 23 directly forms a communication passage with the first connecting pipe 1, and the air flow is provided by the second connecting pipe 2 and the first valve.
  • the port 23 enters the first connecting pipe 1, and at this time, it is not necessary to control the flow rate through the pilot valve core 25.
  • An electronic expansion valve provided by the present invention includes: a valve seat assembly including a valve seat, a first connecting pipe connected to one side of the valve seat, and a second connecting pipe connected to a lower portion of the valve seat; a screw assembly including a screw mounted on the valve seat; the valve needle assembly includes a valve needle disposed in the screw; the valve seat assembly is internally provided with a valve chamber communicating with the first connecting tube and the second connecting tube, and the valve chamber is in communication with the second connecting tube a first valve port is provided, and a valve core having a second valve port is disposed in the valve cavity, and the pilot valve core is sleeved on the valve needle and guided by the valve needle.
  • the valve needle In the first state, the valve needle is guided to the guide The spool abuts against the first valve port and opens the second valve port such that the first connecting tube is electrically connected to the second connecting tube via the second valve port; in the second state, the valve needle closes the second valve The port and the guiding valve spool are separated from the first valve port.
  • the two-way flow switching control is realized by using the pilot valve core, and the one-way valve function can be realized without setting a plurality of expansion valves, thereby simplifying the system control. Reduce the use of parts, it can also simplify the assembly process, less process, mention Production efficiency and reduce costs.
  • An embodiment of the electronic expansion valve provided by the present invention is provided with a limiting member for preventing relative movement of the nut 8 and the screw 6 on the nut 8 and/or the magnetic rotor 7, by the blocking function of the limiting member.
  • the relative displacement rotation between the nut 8 and the screw 6 is not easy, the reliability of the operation of the electronic expansion valve is improved, the positioning is facilitated during installation, the assembly process is simplified, the production efficiency is improved, and the production cost is reduced.
  • the limiting member includes a stopper boss 87 disposed at the bottom of the outer periphery of the nut 8, and a boss 151 disposed on the screw 7, and the boss 151 is disposed at the stopper 15
  • the boss 151 On the side in the axial direction, the boss 151 abuts against the stop boss 87 when the electronic expansion valve is fully closed, thereby achieving a stop function, and restricting the relative movement between the nut 8 and the magnetic rotor 7 in the circumferential direction.
  • the mounting and positioning of the nut and the magnetic rotor are facilitated, the assembly process is simplified, the parts are few, the number of processes is small, the quality control points are small, and the manufacturing efficiency is improved. ,cut costs.
  • the blocking action of the limiting member the relative displacement rotation between the nut and the magnetic rotor is less likely to occur, the reliability of the operation of the electronic expansion valve is improved, the assembly process is simplified, the production efficiency is improved, and the production cost is reduced.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Valve Housings (AREA)

Abstract

一种电子膨胀阀，包括螺杆（6）、嵌套在所述螺杆（6）外的螺母（8）、设置在螺母（8）顶部外圈的限制器（12）、及套设在螺母（8）外圈的磁转子（7），螺母（8）的外周壁设置至少一个第一贴合面（84），磁转子（7）的内周壁设置至少一个与第一贴合面（84）相配合限位的第二贴合面（73），第一贴合面（84）与第二贴合面（73）表面贴合，通过利用第一贴合面（84）和第二贴合面（73）的配合便于螺母（8）与磁转子（7）的安装与定位，简化了装配工艺，提高了制作效率，降低生产成本。

Description

电子膨胀阀 技术领域
本发明涉及阀门技术领域，特别是涉及一种电子膨胀阀。
背景技术
电子膨胀阀作为一种新型的控制元件，早已经突破了节流机构的概念，它是制冷系统智能化的重要环节，也是制冷系统优化得以真正实现的重要手段和保证，也是制冷系统机电一体的象征，已经被应用在越来越多的领域中。
在空调等制冷系统上用来调节制冷剂流量的电子膨胀阀包括阀体部件及线圈，通过线圈驱动阀体部件内的阀针开合度来调节制冷系统制冷剂的流量大小，从而达到控制温度的效果。
中国发明专利申请(申请号为201010515234.1)的中公开了一种电子膨胀阀(如图1)，该电子膨胀阀由阀座组件、螺母组件、阀针丝杆组件以及转子组件组成。在实施过程中，进气接管14套在阀座12的侧孔内，出气接管13压装在阀座芯11的伸出侧，然后一起炉焊完成阀座组件的制作。螺母组件的制作过程是连接板31先在注塑机中注塑成型螺母，然后套装限位弹簧33和止挡圈34，最后还要激光焊接在阀座上。阀针丝杆组件由阀针21弹簧25衬套24压套22钢珠以及丝杆23共六个零件组成通过两道激光焊接组装在一起，转子组件是由磁转子41和导动片42过盈压装后激光焊接在一起然后装配到阀针丝杆组件上再一次通过激光焊，最后还要通过激光焊接 把套管与阀座进行焊接完成阀体制作。整个实施过程中装配工序多，质量控制点多，使用激光焊接地方多达六处，不利于产品质量控制，制造成本高。
发明内容
本发明的目的是提供一种电子膨胀阀，简化装配工艺，减少零件使用，品质控制点少，工序少，提高制作效率，降低成本。
为解决上述技术问题，作为本发明的一个方面，提供一种电子膨胀阀，包括：
螺杆组件，包括螺杆；
转子组件，包括嵌套在所述螺杆外的螺母、设置在所述螺母顶部外圈的限制器、及套设在所述螺母外圈的磁转子，所述螺母的外周壁设置至少一个第一贴合面，所述磁转子的内周壁设置至少一个与所述第一贴合面相配合限位的第二贴合面，所述第一贴合面与所述第二贴合面表面贴合，通过利用第一贴合面和第二贴合面的配合便于螺母与磁转子的安装与定位，简化了装配工艺，提高了制作效率，降低生产成本。
作为本发明的另一个方面，提供一种电子膨胀阀，包括：
阀座组件，包括阀座、连接在所述阀座一侧的第一连接管和连接在所述阀座下部的第二连接管；
螺杆组件，包括安装在所述阀座上的螺杆；
阀针组件，包括设置在在所述螺杆内的阀针；
所述阀座组件内部设置连通所述第一连接管和所述第二连接管的阀腔，所述阀腔与所述第二连接管连通处设有第一阀口，所述阀腔内设置具有第二阀口的导阀芯，所述导阀芯套装在所述阀针上并以所述阀针为导向，在第一状态下，所述阀针导向所述导阀芯抵靠在所述第一阀口并导通所述第二阀口，以使得所述第一连接管经由所述第二阀口与所述第二连接管导通；在第二状态下，所述阀针封闭所述第二阀口并导向所述导阀芯与所述第一阀口分离，利用导阀芯实现两路流量的切换控制，不需要设置多个膨胀阀就可以实现单向阀功能，简化了系统控制，减少零件使用，也可以简化了装配工艺，工序少，提高制作效率并降低成本。
作为本发明的再一个方面，提供一种电子膨胀阀，包括：
螺杆组件，包括螺杆；
转子组件，包括嵌套在所述螺杆外的螺母、设置在所述螺母顶部外圈的限制器、及套设在所述螺母外圈的磁转子，所述螺母和/或所述螺杆上设有用于防止所述螺母和所述螺杆发生相对周向运动的限位件，通过限位件的阻挡作用可以使得螺母和螺杆之间不易发生相对位移转动，提高了电子膨胀阀运行的可靠性，简化了装配工艺，提高了制作效率，降低生产成本。
附图说明
图1示意性示出了现有方案中电子膨胀阀的结构示意图；
图2示意性示出了本发明实施例中的一种电子膨胀阀的剖视结 构示意图；
图3示意性示出了本发明实施例中的一种电子膨胀阀的转子组件的剖视结构示意图；
图4示意性示出了本发明实施例中的一种电子膨胀阀的螺母内孔的剖视结构示意图；
图5示意性示出了本发明实施例中的一种电子膨胀阀的螺母的结构示意图；
图6示意性示出了本发明实施例中的一种电子膨胀阀的螺杆的结构示意图；
图7示意性示出了本发明实施例中的一种电子膨胀阀的螺杆在注塑前的结构示意图；
图8示意性示出了本发明实施例中的一种电子膨胀阀的磁转子的剖视结构示意图；
图9示意性示出了本发明实施例中的一种电子膨胀阀的限制器的结构示意图；
图10示意性示出了本发明实施例中的一种电子膨胀阀的磁转子的结构示意图；
图11示意性示出了本发明实施例中的另一种电子膨胀阀的磁转子的结构示意图；
图12示意性示出了图11中A处的放大示意图；
图13示意性示出了本发明实施例中的另一种电子膨胀阀的剖视示意图；
图14示意性示出了图13中A部分的局部放大示意图；
图15示意性示出了本发明实施例中的另一种电子膨胀阀中导阀芯的结构示意图；
图16示意性示出了本发明实施例中的另一种电子膨胀阀中导阀芯的结构剖视示意图；
图17示意性示出了本发明实施例中的另一种电子膨胀阀中螺杆组件的结构示意图；
图18示意性示出了本发明实施例中的另一种电子膨胀阀中第一连接管向第二连接管通气的结构剖视示意图；
图19示意性示出了本发明实施例中的另一种电子膨胀阀中第二连接管向第一连接管通气的结构剖视示意图。
图中附图标记：第一连接管1、第二连接管2、阀座3，阀针4，套管座5，第二阀口51，流通孔52，导向段53，锥面54，阀腔55，螺杆6、螺纹段61，光滑导向段62，圆环形槽63，注塑结合部64，定位部65，导向段66，D型口67，磁转子7，凸筋71，凹槽72，第二贴合面73，端面75，螺母8，扩大部81，阀针导向段82，锁径部83，第一贴合面84，条形凸起85，台阶面86，止挡凸台87，预紧弹簧安装段88，内螺纹段89，螺杆导向段810，限位块9，复位弹簧10，套管11，限制器12，圆板状部121，外翻部件122，垫片13，预紧弹簧14，止挡块15，凸台151，第一阀口23；阀座24；导阀芯25，阀针26；阀针锥面261，安装腔体91。
具体实施方式
以下对本发明的实施例进行详细说明，但是本发明可以由权利要求限定和覆盖的多种不同方式实施。
请参考图2至图12所示，根据本发明的实施例，电子膨胀阀包括
螺杆组件，包括螺杆6；
转子组件，包括嵌套在螺杆外的螺母8、设置在螺母8顶部外圈的限制器12、套设在螺母8外圈的磁转子7，螺母8可以采用工程塑料注塑成型，螺母8的外周壁设置至少一个第一贴合面84，磁转子7的内周壁设置至少一个与第一贴合面84相配合限位的第二贴合面73，第一贴合面84与第二贴合面73表面贴合，第一贴合面84和第二贴合面73的数量可以相同，通过面面接触，在安装时便于定位，简化了装配工艺，提高了制作效率，降低生产成本。
第一贴合面84和第二贴合面73的形状相匹配，这样可以进行更好的贴合，位于凸筋71上的第二贴合面73可以采用平面或弧面，对应第一贴合面84也为平面或者弧面，例如当第二贴合面73采用凹面时第一贴合面84对应采用凸面，另外，第一贴合面84和第二贴合面73之间采用间隙配合、过度配合或过盈配合，对此不做限定。
结合图9、图10及图11所示，为了避免第一贴合面84和第二贴合面73之间不易产生偏移，在第一贴合面84沿竖直方向设有条形凸起85，条形凸起85配合第二贴合面73上的操作可以起到导向和限位的作用，在所述第一贴合面84与所述第二贴合面73表面贴 合时所述条形凸起85容纳于所述凹槽72内，装配时，先将螺母8套装到磁转子7内，通过磁转子7内设的第二贴合面73来与螺母8外设的第一贴合面84配合固定磁转子7的圆周方向，条形凸起85与凹槽72配合作用能够提高装配的定位精度，还可以降低第一贴合面84和第二贴合面73的的制作精度，提高工艺可行性。
需要说明的是，每个第一贴合面84上条形凸起85的长度尺寸可以不同，可以成对出现，对于尺寸较大的条形凸起85与凹槽72的配合关系是过盈配合，而尺寸较小的条形凸起85与凹槽72的配合关系则可以是间隙配合，对此不做限定。
限制器12采用金属薄片、塑料薄片或橡胶薄片，可以灵活选择，对此不做限定。
结合图4、图5及图9所示，螺母8的顶端设有锁径部83和扩大部81，锁径部83的直径小于所述扩大部81的直径，所述限制器12包括圆板状部121和外翻部件122，圆板状部121与磁转子7的端面75相抵靠，外翻部件122套设并抵紧在锁径部83，外翻部件122发生弹性形变，作用力卡扣在锁径部83，因为扩大部81的存在可以阻挡避免限制器12从锁径部83脱出，通过限制器12可以限制磁转子7的轴向运动，特别是限制向下运动，从而实现固定磁转子7的效果。
对于，外翻部件122的结构可以采用圆筒状也可以采用至少两片弯折部，利用弯折部夹紧锁径部83，本实施例中，采用四片弯折部对称设置在圆板状部121的中心孔周围，中心孔是便于锁径部83 和扩大部81穿过使用。
结合图4和图5所示，本发明实施例中的螺母8具有安装螺杆6的内孔，内孔依次设有螺杆导向段810、内螺纹段89、预紧弹簧安装段88以及阀针导向段82，其中，所述螺杆导向段的内径D1、所述内螺纹段89的小径D2、预紧弹簧安装段88的内径D3、以及阀针导向段82的内径D4满足D1＞D2＞D3＞D4，本实施例中，D4可选2.09毫米，D3可选4.30毫米，D2可选4.36毫米，D1可选5.18毫米，阀针导向段82对应为螺母小孔，螺杆6穿过螺母小孔，采用内径尺寸递进的结构方式便于限位和安装。
结合图7所示，对应地，螺杆6依次设有螺纹段61、光滑导向段62、注塑结合部64、定位部65以及导向段66，在所述注塑结合部64沿周向方向设有圆环形槽63，用过圆环形槽63可以方便注塑附着，提高注塑部位的强度。
结合图7所示，注塑结合部64的侧面设有D型口67，除了D型口67的形状还可以有其他形状结构的缺口，如异型缺口、不对称缺口等，止挡块15通过注塑结合部64注塑在螺杆6上，采用D型口67也同样是为了提高注塑附着，提高注塑部位的强度，需要说明的是，对于圆环形槽63和D型口67结构可以同时使用也可以分别采用，对此不做限定。
结合图8所示，进一步地，螺母8还具有台阶面86，该台界面可以设置于螺母8的底部，台阶面86与凸筋71的端面75相抵靠，另外，止挡块15在轴向方向的侧面设有凸台151，螺母8外周的底 部设有止挡凸台87，在电子膨胀阀全关时凸台151与止挡凸台87相抵靠，实现止挡作用。
结合图9、图10及图11所示，进一步地，凸筋71的高度小于磁转子7的高度，凸筋71沿着磁转子7中间成两端对称分布，具体地，所述凸筋71为四个且等间隔设置在所述磁转子7的内周壁上，所述第一贴合面84具有四个且均布在所述螺母8的外周壁。
实施时，套管座5与阀座在过盈压装后装好焊环再装上第一连接管1和第二连接管2通过隧道炉完成焊接，螺杆组件由螺杆6和注塑在其上的止挡块15组成，实施时，把螺杆组件过盈压装到阀座内腔中实现固定，把螺母8套装到磁转子7内，通过磁转子7内设的四条凸筋71上的第二贴合面73与螺母8外设的四个第一贴合面84配合固定磁转子7的圆周方向，装配后，条形凸起85和凹槽72配合作用能够提高装配的定位精度，同时也降低第一贴合面84和第二贴合面73的制作精度，提高工艺可行性。然后安装限制器12，由于限制器12的弯折部与锁径部83相抵，同时弯折部发生弹性形变作用力扣合在锁径部83上，利用扩大部81防止限制器12脱出也能起到限制磁转子7的轴向下运动进而固定磁转子7，接着依次装入阀针、预紧弹簧14、垫片13和的转子组件，通过设置在螺母8内腔螺纹段与螺杆螺纹段配合作用，顺时针旋入转子组件，直到设置在螺母8上的止挡块15碰到设置在螺杆组件上的止挡块15上的凸台151为止，再逆时针方向转动转子组件设定的角度，这一过程称之前膨胀阀初始化过程，然后保持转子组件位置不动，装入限位块9，限位 块9与阀针间隙配合，阀针穿过螺母小孔，限位块9与螺母小孔端面75贴合，这个时间通过激光焊接将限位块9与阀针固定，接着装入复位弹簧10，再压入套管11，套管11与套管座5过盈压装后通过连续式激光焊接连接，保证密封性能。
结合图13所示，具体地，本发明的另一种实施例中的电子膨胀阀，包括
阀座组件，包括阀座3、连接在阀座3一侧的第一连接管1和连接在阀座3下部的第二连接管2，以及设置在阀座3上的套管座5，具体地，套管座5与阀座3在过盈压装后装好焊环再装上第一连接管1和第二连接管2通过隧道炉完成焊接。
阀针组件，包括安装在螺杆6上的阀针4，以及套设在阀针4上的预紧弹簧14；
套管组件，包括安装在螺杆6顶部的限位块9、安装在限位块9上的复位弹簧10、以及套在转子组件外并与所述套管座5连接的套管11；
螺杆组件，包括压装在所述阀座上的螺杆6，及安装在螺杆6上的止挡块15，止挡块15可以通过注塑的方式设置在螺杆6上，实施时，把螺杆组件过盈压装到阀座5内腔中实现固定。
阀座组件内部设置连通第一连接管1和第二连接管2的阀腔55，阀腔55与第二连接管2连通处设有第一阀口23，阀腔55内设置具有第二阀口51的导阀芯25，导阀芯25套装在阀针26上并以阀针26为导向，在第一状态下，阀针26导向导阀芯25抵靠在第一阀口 23并导通所述第二阀口51，使得第一连接管1经由第二阀口51与第二连接管2导通；在第二状态下，阀针26封闭第二阀口51并导向导阀芯25与第一阀口23分离，利用导阀芯25实现两路流量的切换控制，不需要设置多个膨胀阀就可以实现单向阀功能，简化了系统控制，减少零件使用，也可以简化了装配工艺，工序少，提高制作效率并降低成本。
如图13、图14、图15和图16所示，导阀芯25还包括：设置在导阀芯25侧壁上的至少一个用于连通第一连接管1和第二阀口51的流通孔52和设置在导阀芯25另一端的用于套设在阀针26并以所述阀针5为导向的导向段53；第二阀口51用于与第二连接管2连通；导向段53套装在阀针26上并以阀针26为导向；流通孔52设置在导阀芯25的侧壁内并用于连通第一连接管1和第二阀口51；导阀芯25包括环绕导阀芯25的一端设置的用于与第一阀口23抵靠且外端面为锥形结构的锥面54；第二阀口51与流通孔52构成连接通道。
如图15所示，需要说明的是，流通孔52的个数可以为多个，本实施例中，流通孔52为四个，四个流通孔52均布在导阀芯25的侧壁上。
结合图13和图14所示，阀针26的一端设有用于与第二阀口51抵靠的阀针锥面54，阀针锥面54与第二阀口51抵靠后实现对第二阀口的密封作用。
结合图16所示，阀腔55的内径D2，所述导向段的内径D1，为了保证流通能力，需满足D2＞D1关系。
如图13和图17所示，螺杆6下端设有用于容纳阀针26和导向段53的安装腔体91，导向段53可以在安装腔体内往复运动。
如图17所示，螺杆6上设有止挡块15，所述螺母8的底端设有止挡凸台，止挡凸台与止挡块15配合对螺杆6进行限位，当阀体全关时，可以防止过度压缩预紧弹簧14。
螺杆6依次设有螺纹段、光滑导向段、注塑结合部、定位部以及导向段，在所述注塑结合部的侧面设有D型口并沿周向方向设有圆环形槽，止挡块15通过所述注塑结合部注塑在螺杆6上。
限位器13与阀针26通过焊接在一起，当转子组件逆时针方向转动时，为开阀动作，通过螺杆6与螺母8上的螺纹传动作用，转子组件向上抬升，通过限位器13带动阀针26也向上抬升，离开阀口。
如图18所示，通过在导阀芯25内设置外端面为锥形结构的锥面，可以在第一连接管1向第二连接管2通气过程中，导阀芯25在阀针的导向下通过锥面54与第一阀口23抵靠密封，使得气体通过流通孔52、腔体及第二阀口51后进入第二连接管2内，再通过调节阀针26的锥面与第二阀口51之间的间距，阀针26的位置可以根据需要由线圈来设定，通过螺纹传动带动阀针26上升或下降运动，这种工作状态时，导阀芯25受自身重力和高压侧气压原因，导阀芯25底部的锥面与第一阀口23接触密封，流量只能通过第二阀口51流过，实现阀针26控制该单向连接通道的流量，从而实现单向控制流量的效果。
如图19所示，在第二连接管2向第一连接管1通气过程中，先将阀针26打开，导阀芯受气流作用被顶开，使整个导阀芯25的锥面54与第一阀口23分开，第二阀口与阀针26的锥面61抵靠密封，第一阀口23与第一连接管1直接构成连通通道，气流由第二连接管2、第一阀口23进入第一连接管1，此时不需要通过导阀芯25控制流量。
本发明提供的一种电子膨胀阀包括：阀座组件，包括阀座、连接在所述阀座一侧的第一连接管和连接在所述阀座下部的第二连接管；螺杆组件，包括安装在阀座上的螺杆；阀针组件，包括设置在在螺杆内的阀针；阀座组件内部设置连通第一连接管和第二连接管的阀腔，阀腔与第二连接管连通处设有第一阀口，阀腔内设置具有第二阀口的导阀芯，导阀芯套装在阀针上并以阀针为导向，在第一状态下，所述阀针导向所述导阀芯抵靠在第一阀口并导通第二阀口，以使得第一连接管经由第二阀口与所述第二连接管导通；在第二状态下，阀针封闭第二阀口并导向导阀芯与第一阀口分离，通过本发明结构，利用导阀芯实现两路流量的切换控制，不需要设置多个膨胀阀就可以实现单向阀功能，简化了系统控制，减少零件使用，也可以简化了装配工艺，工序少，提高制作效率并降低成本。
本发明还提供的电子膨胀阀的一种实施例，在螺母8和/或磁转子7上设有用于防止螺母8和螺杆6发生相对周向运动的限位件，通过限位件的阻挡作用可以使得螺母8和螺杆6之间不易发生相对位移转动，提高了电子膨胀阀运行的可靠性，安装时便于定位，简 化了装配工艺，提高了制作效率，降低生产成本
结合图5和图6所示，具体地，限位件包括设置在螺母8外周的底部设有止挡凸台87以及设置在螺杆7上的凸台151，凸台151设置在止挡块15在轴向方向的侧面上，在电子膨胀阀全关时凸台151与止挡凸台87相抵靠，实现止挡作用，限制螺母8和磁转子7之间产生周向方向的相对运动。
综上所述，通过利用第一贴合面和第二贴合面的配合便于螺母与磁转子的安装与定位，简化了装配工艺，零件少，工序少，品质控制点少，提高了制作效率，降低成本。通过限位件的阻挡作用可以使得螺母和磁转子之间不易发生相对位移转动，提高了电子膨胀阀运行的可靠性，简化了装配工艺，提高了制作效率，降低生产成本。
以上仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (20)

  1. 一种电子膨胀阀，其特征在于，包括：
    螺杆组件，包括螺杆；
    转子组件，包括嵌套在所述螺杆外的螺母、设置在所述螺母顶部外圈的限制器、及套设在所述螺母外圈的磁转子，所述螺母的外周壁设置至少一个第一贴合面，所述磁转子的内周壁设置至少一个与所述第一贴合面相配合限位的第二贴合面，所述第一贴合面与所述第二贴合面表面贴合。
  2. 根据权利要求1所述的电子膨胀阀，其特征在于，所述螺母具有安装所述螺杆的内孔，所述内孔依次设有螺杆导向段、内螺纹段、预紧弹簧安装段以及阀针导向段，其中，所述螺杆导向段的内径D1、所述内螺纹段的小径D2、预紧弹簧安装段的内径D3、以及阀针导向段的内径D4满足D1＞D2＞D3＞D4。
  3. 根据权利要求1所述的电子膨胀阀，其特征在于，所述磁转子呈圆筒状且内周壁设有与所述第二贴合面个数相同数量的凸筋，所述第二贴合面设置在所述凸筋上。
  4. 根据权利要求3所述的电子膨胀阀，其特征在于，所述第一贴合面沿竖直方向设有条形凸起，所述第二贴合面沿竖直方向设有凹槽，在所述第一贴合面与所述第二贴合面表面贴合时所述条形凸起容纳于所述凹槽内。
  5. 根据权利要求2所述的电子膨胀阀，其特征在于，所述第一贴合面与所述第二贴合之间贴合方式采用间隙配合、过渡配合或过盈 配合。
  6. 根据权利要求1所述的电子膨胀阀，其特征在于，所述螺母的顶端设有锁径部和扩大部，所述限位块卡设在所述锁径部内，所述锁径部的直径小于所述扩大部的直径；
    所述限制器包括圆板状部和外翻部件，所述外翻部件套设并抵紧在所述锁径部，所述圆板状部与所述磁转子的端面相抵靠。
  7. 根据权利要求3所述的电子膨胀阀，其特征在于，所述凸筋的高度小于所述磁转子的高度。
  8. 根据权利要求1所述的电子膨胀阀，其特征在于，所述螺杆依次设有螺纹段、光滑导向段、注塑结合部、定位部以及导向段，在所述注塑结合部的侧面设有D型口并沿周向方向设有圆环形槽。
  9. 根据权利要求8所述的电子膨胀阀，其特征在于，所述螺杆组件还包括安装在所述螺杆上的止挡块，所述止挡块通过所述注塑结合部注塑在所述螺杆上。
  10. 根据权利要求2所述的电子膨胀阀，其特征在于，所述凸筋为四个且等间隔设置在所述磁转子的内周壁上，所述第一贴合面具有四个且均布在所述螺母的外周壁上。
  11. 根据权利要求1所述的电子膨胀阀，其特征在于，所述螺母和/或所述螺杆上设有用于防止所述螺母和所述螺杆发生相对周向运动的限位件。
  12. 根据权利要求11所述的电子膨胀阀，其特征在于，所述限位件 包括设置在所述螺母外周的底部设有止挡凸台以及设置在所述螺杆上的凸台，在所述电子膨胀阀全关时所述凸台与所述止挡凸台相抵靠。
  13. 根据权利要求12所述的电子膨胀阀，其特征在于，所述螺杆组件还包括安装在所述螺杆上的止挡块，所述止挡块通过所述注塑结合部注塑在所述螺杆上，所述凸台设置在所述止挡块在轴向方向的侧面上。
  14. 根据权利要求13所述的电子膨胀阀，其特征在于，所述外翻部件具有至少两片弯折部，所述弯折部夹紧所述锁径部。
  15. 根据权利要求1所述的电子膨胀阀，其特征在于，还包括：
    阀座组件，包括用于安装所述螺杆的阀座、连接在所述阀座一侧的第一连接管和连接在所述阀座下部的第二连接管；
    阀针组件，包括设置在在所述螺杆内的阀针；
    所述阀座组件内部设置连通所述第一连接管和所述第二连接管的阀腔，所述阀腔与所述第二连接管连通处设有第一阀口，所述阀腔内设置具有第二阀口的导阀芯，所述导阀芯套装在所述阀针上并以所述阀针为导向，在第一状态下，所述阀针导向所述导阀芯抵靠在所述第一阀口并导通所述第二阀口，以使得所述第一连接管经由所述第二阀口与所述第二连接管导通；在第二状态下，所述阀针封闭所述第二阀口并导向所述导阀芯与所述第一阀口分离。
  16. 根据权利要求15所述的电子膨胀阀，其特征在于，所述导阀芯包括：
    环绕所述导阀芯的一端设置的用于与所述第一阀口抵靠且外端面为锥形结构的锥面；
    设置在所述导阀芯另一端的用于套设在所述阀针并以所述阀针为导向的导向段；
    设置在所述导阀芯侧壁上的至少一个用于连通所述第一连接管和第二阀口的流通孔，所述第二阀口与所述流通孔构成连接通道。
  17. 根据权利要求16所述的电子膨胀阀，其特征在于，所述阀腔的内径大于所述导向段的内径。
  18. 根据权利要求16所述的电子膨胀阀，其特征在于，所述流通孔为四个且均布在所述导阀芯的侧壁上。
  19. 根据权利要求16所述的电子膨胀阀，其特征在于，所述阀针的一端设有用于与所述第二阀口抵靠的阀针锥面。
  20. 根据权利要求16所述的电子膨胀阀，其特征在于，所述阀针的一端设有用于与所述第二阀口抵靠的阀针锥面。
PCT/CN2018/082863 2018-04-12 2018-04-12 电子膨胀阀 WO2019196063A1 (zh)

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