WO2019052570A1 - 电子膨胀阀 - Google Patents

电子膨胀阀 Download PDF

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Publication number
WO2019052570A1
WO2019052570A1 PCT/CN2018/106153 CN2018106153W WO2019052570A1 WO 2019052570 A1 WO2019052570 A1 WO 2019052570A1 CN 2018106153 W CN2018106153 W CN 2018106153W WO 2019052570 A1 WO2019052570 A1 WO 2019052570A1
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WO
WIPO (PCT)
Prior art keywords
valve
steel ball
electronic expansion
valve needle
groove portion
Prior art date
Application number
PCT/CN2018/106153
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English (en)
French (fr)
Inventor
张金荣
魏先让
Original Assignee
浙江三花智能控制股份有限公司
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Application filed by 浙江三花智能控制股份有限公司 filed Critical 浙江三花智能控制股份有限公司
Publication of WO2019052570A1 publication Critical patent/WO2019052570A1/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
    • 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
    • F16K1/42—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
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means

Definitions

  • the invention relates to the technical field of a fluid control component of a refrigeration system, and in particular to an electronic expansion valve.
  • the electronic expansion valve is a refrigerant flow control component of a refrigeration and heating device, and the working process is generally: when the coil device as a stator is energized or de-energized, the belt action is a rotation of the magnetic rotor component of the rotor, and The magnetic rotor is fixedly connected and follows the rotation of the magnetic rotor to drive the needle movement.
  • the electronic expansion valve is provided with a nut member, and the nut member is provided with an internal thread structure, and correspondingly, the screw is provided with an external thread structure through the thread
  • the sub-cooperation makes the screw rod drive the valve needle for lifting movement while rotating, and adjusts the opening degree between the valve needle and the valve port to adjust the flow rate of the refrigerant flowing through the valve port, thereby realizing the system function. And achieve the purpose of precise control.
  • the vibration of the compressor and the pressure of the refrigerant pulse will have a certain impact on the valve needle or the screw.
  • the screw of the electronic expansion valve may be deflected at a certain angle during the operation. The slanting affects the reliability of the operation, and the driving screw of the driving component drives the valve in the axial direction.
  • the force applied to the valve needle is large, and the valve needle easily follows the rotation to cause the thread pair.
  • the wear and the wear of the valve port components, so how to design an electronic expansion valve structure that prevents the screw from being deflected while the force applied to the valve needle is small to prevent the valve port from being worn is a technical problem that those skilled in the art need to solve. problem.
  • the technical problem to be solved by the present invention is to provide an electronic expansion valve which can ensure the reliability of the axial movement of the screw rod to prevent its deflection, and at the same time exert a small force on the valve needle to reduce the mutual force
  • the rotating torque reduces the rotation of the valve needle, prevents the valve port from being worn, and further improves the service life of the product.
  • Electronic expansion valves include:
  • valve seat the valve seat is provided with a valve port and a valve seat cavity is formed in the valve seat;
  • valve needle that opens or closes the valve port to regulate the flow of refrigerant through the valve port
  • the screw rod is floatingly connected to the valve needle through a sleeve;
  • the nut, the nut and the lead screw are matched by the thread
  • the sleeve further includes a support portion, and a steel ball is disposed between the support portion and the valve needle.
  • Electronic expansion valves include:
  • valve seat the valve seat is provided with a valve port and a valve seat cavity is formed in the valve seat;
  • valve needle that opens or closes the valve port to regulate the flow of refrigerant through the valve port
  • the screw rod is floatingly connected to the valve needle through a sleeve;
  • the nut, the nut and the lead screw are matched by the thread
  • the sleeve has a sleeve cavity, and the sleeve cavity is provided with an end plate portion, a boss, a spring, and a support portion.
  • the spring is supported by the support portion, and a steel ball is disposed between the support portion and the valve needle.
  • FIG. 1 is a schematic overall structural view of an embodiment of an electronic expansion valve provided by the present invention.
  • FIG. 2 is an enlarged schematic view showing a steel ball fitting structure of an electronic expansion valve provided by the present invention
  • FIG 3 is an enlarged schematic view showing a steel ball fitting structure of an electronic expansion valve provided by the present invention.
  • FIG. 1 is a schematic view showing the overall structure of an embodiment of an electronic expansion valve provided by the present invention.
  • the present invention is directed to improving the mating structure of the valve needle and the lead screw of the prior art electronic expansion valve, and other components of the electronic expansion valve, such as a magnetic rotor, a nut, a stopper, and the like, can be used.
  • General-purpose technology other electronic expansion valve structures that can achieve the same function can also be used.
  • the present invention does not specifically limit the structure of the above components, and those skilled in the art can apply it to all similar electronic expansion valve structures according to the technical solution disclosed in the present invention.
  • the electronic expansion valve has a valve seat 1 , and the valve seat 1 can be formed by metal cutting.
  • the lower part and the side part respectively have a connection port, and the first connection tube 3 and the second connection tube 2 are fixedly connected to the connection port respectively, and the first connection tube 3 is respectively connected.
  • the second nozzle 2 can be used as an inlet pipe or an outlet pipe
  • the valve seat 1 is formed with a valve seat cavity
  • the lower portion is further provided with a valve port 1a that cooperates with the valve needle 14, and the valve needle 14 is driven away from or in contact with the valve port under the driving of the driving component.
  • 1a regulates the flow rate of the refrigerant flowing through the valve port 1a.
  • a cover portion 4 is fixedly connected to the valve seat 1, and a cylindrical outer casing 5 is fixedly coupled to the cover 4, and the valve seat 1, the cover 4 and the outer casing 5 constitute a relatively closed inner cavity.
  • the inner cavity includes a rotor 6, a connecting seat 7 and a screw rod 8.
  • the screw rod 8 is fixedly connected to the rotor 6 in the axial direction through the connecting seat 7, and the screw rod 8 is integrally formed with the rotor 6 through the connecting seat 7, the wire
  • the rod 8 can be fixedly coupled to the joint 7 by welding or the like, and the joint 7 can be integrally molded with the rotor 6.
  • the outer edge portion of the screw rod 8 is formed with an external thread portion 8a that is screwed with the internal thread portion of the nut 9, and a nut guide hole is formed at the center of the nut 9 to guide the screw rod 8 through the screw fit of the screw rod 8 and the nut 9.
  • the action converts the rotation of the rotor in the circumferential direction into the movement of the screw rod 8 in the axial direction to drive the valve needle 14 to open or close the valve port 1a.
  • the nut 9 is provided with a connecting piece, and the connecting piece can be integrally molded with the nut 9.
  • the nut 9 is fixedly connected to the cover 4 through the connecting piece, and the screw rod 8 is floatingly connected with the valve pin 14 through the sleeve 16, and the sleeve 16 is substantially bottom.
  • a cup having an opening through which the valve needle 14 enters the valve seat cavity to contact or move away from the valve port 1a.
  • the sleeve 16 has a sleeve cavity, and an end plate portion 10 is disposed at the top of the sleeve cavity.
  • the end plate portion 10 is provided with an end plate thrust surface 10a.
  • the lower end portion of the screw rod 8 is fixedly connected with a boss 11 and the boss 11 is provided with
  • the boss thrust surface 11a can be fixedly connected to the screw rod 8 and the boss 11 after assembly, and then placed in the sleeve cavity, and then the end plate portion 10 and the sleeve 16 are fixedly connected by, for example, welding.
  • the boss thrust surface 11a is disposed opposite to the end plate thrust surface 10a, and the sleeve 16 is suspended on the screw rod 8.
  • the spring 12 is further disposed under the boss 11, and the spring 12 is supported by the support portion 13, and the support portion 13
  • a steel ball is disposed between the valve needle 14 and a gasket is disposed between the valve needle 14 and the sleeve 16.
  • valve needle 14 is suspended from the sleeve 16. It should be noted that the valve needle 6 is in operation during the operation of the electronic expansion valve. It is possible to move relative to the sleeve 15 but not to be detached from the sleeve 15, i.e. the valve needle 14 comprises a body and a flange portion 14a, the outer diameter of the flange portion 14a being larger than the outer diameter of the bottom opening of the sleeve 16 to prevent the valve needle 14 Falling off the sleeve 16.
  • a spacer is disposed between the valve needle 14 and the sleeve 16 to reduce the gap between the valve needle 14 and the sleeve 16.
  • the frictional force, the support portion 13 includes a body portion and a support flange portion 131, the diameter of the support flange portion 131 is larger than the body diameter of the support portion 13, and the diameter of the support flange portion 131 is greater than or equal to the diameter of the spring 12 to make the spring 12 It can be supported by the support portion 13.
  • the flange portion 14a is provided with an arcuate groove portion 141a to abut against the spherical bottom surface of the steel ball 15, and the support flange portion 131 of the support portion 13 is provided with a groove portion 1311 to abut the spherical upper end surface of the steel ball 15. Then, the groove portion 131 and the curved groove portion 141a substantially wrap the entire steel ball 15, and it should be noted that the diameter of the steel ball 15 is larger than the depth of the curved groove portion 141a, so that the steel ball 15 can expose the flange of the valve needle 14.
  • the upper end surface of the portion 14a abuts against the support portion 13, or the outer diameter of the steel ball 15 is larger than the depth of the groove portion 131, so that the steel ball 15 can expose the lower end surface of the support flange portion 132 to abut against the flange portion 141a.
  • the material of the steel ball 15 may be SUS440C or of course other materials such as ceramics. In the present invention, the material of the steel ball is not particularly limited.
  • valve needle 14 is driven to perform the axial lifting movement due to The screw rod 8 itself is rotating, so it is inevitable that the valve needle 14 will naturally give a rotational moment.
  • the valve needle 14 is not in contact with the valve port 1a, the valve needle 14, the sleeve 16 and the screw rod 8 can rotate together;
  • the valve needle 14 is in contact with the valve port 1a, the valve port 1a is in a closed state, and the flow rate is driven at 0.
  • the flow rate increases as the pulse increases, and the critical valve opening point is used as a limit.
  • the sealing surface of the valve needle 14 and the valve port 1a are just in contact, in order to improve the reliability of the product, it is desirable that the valve needle 14 does not rotate, that is, the screw 8 is expected to rotate, and the valve needle 14 does not rotate.
  • the boss thrust surface 11a and the end face thrust surface 10a are also in a contact state, and the spring force and the air pressure received by the needle 14 act between the boss thrust surface 11a and the end plate thrust surface 10a, in order to When the screw rod 8 rotates relative to the valve needle 14, the friction between the end plate portion 10 and the boss 11 needs to be minimized, and the friction reducing coating can be generally applied to the end plate thrust surface 10a or the boss thrust surface 11a.
  • the manner is realized, and a steel ball 15 is disposed between the valve needle 14 and the support portion 13.
  • the screw rod 8 drives the boss 11, the spring 12 and the support member 13 as a whole relative to the steel ball 15 Rotation, generally, the ball 15 is also rotated relative to the screw under the force, but the rotation is reduced due to the point contact or line contact structure between the steel ball 15 and the support portion 13, and the steel ball 15 further exerts the force.
  • the valve needle 14 is applied, since the steel ball 15 and the valve needle 14 also have a point contact or a line contact action, the force applied by the steel ball 15 to the valve needle 14 is also reduced, and the valve needle 14 is after the critical valve opening point.
  • the valve needle 14 can be relatively rotated or relatively rotatable as two relatively independent elements, generally relatively non-rotating, but the force applied by the steel ball 15 to the valve needle 14 is very small even when rotated relatively, reducing the valve needle 14 The rotation.
  • the wear of the valve needle 14 to the valve port 1a is reduced, and the presence of the steel ball 15 reduces the resistance between the support portion 13 and the valve needle 14, because the arrangement of the steel ball 15 causes the support portion 13 and the valve needle 14 to There is a certain amount of space between the movements.
  • the space can be adjusted through the activity space, that is, the steel ball 15 has a aligning effect on the screw rod 8 to prevent the screw rod from being actuated. Skew in the middle.
  • FIG. 3 is another embodiment of the present invention, which differs from the above-described embodiment in the cooperation of the support portion 13 and the valve needle 14 with the steel ball 15, which
  • the support flange portion 131 of the support portion 13 is provided with an arcuate groove portion 141a'
  • the flange portion 14a of the valve needle 14 is provided with a groove portion 1311'.
  • the arcuate groove portion 141a' and the groove portion 13111' collectively wrap and abut the steel ball 15 as a whole.
  • the diameter of the steel ball 15 is larger than the depth of the curved groove portion 141a' or the diameter of the steel ball 15 is larger than the depth of the groove portion 13111'.
  • a point contact or line contact structure is formed between the steel ball 15 and the valve needle 14. The structure and function of the remaining related components have been described in the above, and will not be described herein.
  • the technical solution provided by the present invention focuses on the structure of the relevant components in the protective sleeve 16 and the structure in which the screw rod 8 is floatingly connected between the sleeve 16 and the valve needle 14.
  • other electronic expansion valve components such as nuts, The rotor, the valve seat and the like are not particularly limited, and the related technical solutions provided by the present invention can also be applied to other electronic expansion valve structures in which the valve needle is moved up and down in the axial direction of the screw belt.
  • the invention adopts a steel ball structure arranged between the support portion and the valve needle, and on the one hand, plays a role of aligning the screw rod, and even if the screw rod is deflected a certain time, it is adjusted through the corresponding movable space, and on the other hand, the steel A point contact or line contact structure between the ball and the support portion or between the steel ball and the valve needle.
  • the lead screw, the lead screw and the support portion are rotated as a whole, and the rotation is reduced.
  • the rotational torque between the steel balls, and the force exerted by the rear steel ball on the valve needle is further reduced, further reducing the wear of the valve against the valve port.
  • the upper, lower, left, and right azimuth terms described herein are all described in the reference view shown in FIG. 1, and should not be construed as limiting the present invention.

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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)

Abstract

电子膨胀阀包括：阀座（1），阀座（1）设有阀口（1a）并且阀座（1）内形成阀座腔；阀针（14），阀针（14）可打开或关闭阀口（1a）以对流经阀口（1a）的冷媒进行流量调节；丝杆（8），丝杆（8）通过套筒（16）与阀针（14）进行浮动连接；螺母（9），螺母（9）与丝杆（8）通过螺纹进行配合；套筒（16）还包括支撑部（13），支撑部（13）和阀针（14）之间设置有钢球（15），钢球（15）对丝杆（8）有调心作用防止电子膨胀阀作动过程中丝杆（8）的倾斜同时钢球（15）对阀针（14）施加的作用力较小降低了相互之间的旋转扭矩减少了阀针（14）的进一步旋转，以防止阀针（14）对阀口（1a）造成的磨损。

Description

电子膨胀阀
本申请要求于2017年09月18日提交中国专利局、申请号为201721194122.4、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
本发明涉及制冷系统流体控制部件技术领域，特别涉及一种电子膨胀阀。
背景技术
在制冷制热技术领域，电子膨胀阀是制冷制热设备的冷媒流量控制部件，其工作过程一般为：随着作为定子的线圈装置的通电或断电，带动作为转子的磁转子部件旋转，与磁转子固定连接并跟随磁转子旋转的丝杆带动阀针运动，电子膨胀阀中设置有螺母部件，螺母部件设置有内螺纹结构，与之相应地，丝杆上设置有外螺纹结构，通过螺纹副的配合，使丝杆在作旋转运动的同时还带动阀针作升降运动，以调节阀针与阀口之间的开度的方式来调节流过阀口的冷媒的流量，从而实现系统功能并达到精确控制的目的。
电子膨胀阀在制冷系统中使用时，压缩机的振动和冷媒脉冲的压力，会对阀针或丝杆带来一定的冲击，电子膨胀阀在作动过程中丝杆可能会进行一定角度的偏斜从而影响作动可靠性，并且受到驱动部件的驱动丝杆在轴向上带动阀针对阀口进行开闭过程中，施加给阀针的作用力较大，阀针容易跟随旋转从而造成螺纹副的磨损以及阀口部件的磨损，因此如何设计一种防止丝杆偏斜同时施加给阀针的作用力较小以防止阀口磨损的电子膨胀阀结构，是本领域技术人员亟需解决的技术问题。
发明内容
本发明要解决的技术问题为提供一种电子膨胀阀，该电子膨胀阀能够确保丝杆轴向作动的可靠性防止其偏斜，同时对阀针施加较小的作用力降低互相之间的旋转扭矩以减少阀针的旋转，防止阀口的磨损，进一步提高产品使用寿命，为此，本发明采用以下技术方案：
电子膨胀阀包括：
阀座，阀座设有阀口并且阀座内形成阀座腔；
阀针，阀针可打开或关闭阀口以对流经阀口的冷媒进行流量调节；
丝杆，丝杆通过套筒与阀针进行浮动连接；
螺母，螺母与丝杆通过螺纹进行配合；
套筒内还包括支撑部，支撑部和阀针之间设置有钢球。
电子膨胀阀包括：
阀座，阀座设有阀口并且阀座内形成阀座腔；
阀针，阀针可打开或关闭阀口以对流经阀口的冷媒进行流量调节；
丝杆，丝杆通过套筒与阀针进行浮动连接；
螺母，螺母与丝杆通过螺纹进行配合；
套筒具有套筒腔，套筒腔内设有端板部、凸台、弹簧、支撑部，弹簧由支撑部进行支撑，支撑部和所述阀针之间设置有钢球。
附图说明
图1是本发明提供的电子膨胀阀的一种实施方式整体结构示意视图；
图2是本发明提供的电子膨胀阀的钢球配合结构放大示意图；
图3是本发明提供的电子膨胀阀的钢球配合结构放大示意图。
具体实施方式
为了使本领域的技术人员更好地理解本发明的技术方案，下面结合附图和具体实施例对本发明作进一步的详细说明。
请参照图1，图1是本发明提供的电子膨胀阀其中一种实施方式的整体结构示意图。
需要指出的是，本发明是针对现有技术的电子膨胀阀的阀针和丝杆的配合结构进行改进，对于电子膨胀阀的其他部件，如磁性转子、螺母、止动装置等部件均可以采用通用的技术，也可以采用其他可以实现相同功能的电子膨胀阀结构。本发明并不对上述部件的结构进行特别限定，本领域技术人员根据本发明披露的技术方案，可以将其应用于所有类似的电子膨胀阀结构上。
电子膨胀阀具有阀座1，阀座1可以采用金属切削加工成形，其下部和侧部分别开设有连接口，该连接口上分别固定连接有第一接管3以及第二接管2，第一接管3或第二接管2都可以作为进口管或出口管，阀座1形成有阀座腔，下部还设有与阀针14配合的阀口1a，在驱动部件驱动下阀针14远离或接触阀口1a以对流经阀口1a的冷媒进行流量调节。
阀座1上方固定连接有罩盖部4，罩盖4上固定连接有圆筒状的外壳5，阀座1、罩盖4以及外壳5三者构成了一个相对封闭的内腔。该内腔中包括转子6、连接座7以及丝杆8，丝杆8通过连接座7与转子6在轴向上相对固定连接，同时丝杆8通过连接座7与转子6构成一个整体，丝杆8可以通过焊接等方式固定连接于连接座7，连接座7可以与转子6一体注塑成型。丝杆8的外缘部形成与螺母9的内螺纹部进行螺合的外螺纹部8a，螺母9中央形成有螺母导向孔以对丝杆8进行导向，通过丝杆8和螺母9的螺纹配合作用将转子在周向上的旋转转化为丝杆8在轴向方向上的运动从而带动阀针14打开或关闭阀口1a。螺母9设有连接片，连接片可以与螺母9一体注塑成型，螺母9通过连接片固定连接于罩盖4，丝杆8通过套筒16与阀针14进行浮动连接，套筒16大体呈底部带开口的杯状体，阀针14穿过该开口进入阀座腔内与阀口1a接触或远离。套筒16具有套筒腔，在套筒腔的顶部设有端板部10，端板部10设置有端板推力面10a，丝杆8下端部固定连接有凸台11，凸台11设置有凸台推力面11a，在装配时可以将丝杆8和凸台11固定连接后放置入套筒腔后再将端板部10与套筒16通过例如焊接等方式进行固定连接。凸台推力面11a与端板推力面10a形成对向设置，并将套筒16悬挂在丝杆8上，凸台11下方还设置有弹簧12，弹簧12由支撑部13进行支撑，支撑部13与阀针14之间设置有钢球，阀针14与套筒16之间设置有垫片，阀针14悬挂在套筒16上，需要说明的是在电子膨胀阀运行过程中，阀针6可以相对套筒15进行运动但是无法从套筒15中脱离,即阀针14包括本体及凸缘部14a，凸缘部14a的外径大于套筒16的底部开口的外径以防止阀针14从套筒16上脱落。
参照图1和图2所示为本发明提供的一种实施方式，在本实施方式中，阀针14和套筒16之间设置有垫片以减小阀针14和套筒16之间的摩擦力，支撑部13包括本体部和支撑凸缘部131，支撑凸缘部131的直径大于支撑 部13的本体直径，且支撑凸缘部131的直径大于或等于弹簧12的直径以使弹簧12能支撑于支撑部13。凸缘部14a开设有弧形槽部141a以与钢球15的球形底面相贴合抵接，支撑部13的支撑凸缘部131开设有凹槽部1311以与钢球15的球形上端面相抵接，凹槽部131和弧形槽部141a大体包裹整个钢球15，需要说明的是钢球15的直径大于弧形槽部141a的深度，这样钢球15就可露出阀针14的凸缘部14a的上端面与支撑部13相抵接，或者钢球15的外径大于凹槽部131的深度，这样钢球15就可露出支撑凸缘部132的下端面与凸缘部141a相抵接。钢球15材质可以是SUS440C当然也可以是陶瓷等其他材质，在本发明中并不对钢球的材质作特殊限定。需要说明的是当电子膨胀阀的运行过程中，通过给步进电机定子脉冲指令，驱动转子6转动，进而带动转子8旋转，在螺纹副作用下，带动阀针14做轴向的升降运动，由于丝杆8本身在转动，因此不可避免地会天然给阀针14一个转动力矩，当阀针14与阀口1a不接触状态时，阀针14、套筒16以及丝杆8可以一起转动；当阀针14与阀口1a相接触时，阀口1a处于闭阀状态，流量驱动于0，当临界开阀点后，流量随着脉冲增大而增大，以临界开阀点为界限，此时阀针14与阀口1a两者的密封面刚刚接触，为了提高产品可靠性，此时期望阀针14不发生转动，即期望丝杆8发生转动，而阀针14不发生转动。而此时，凸台推力面11a和端面推力面10a也正好处于接触状态，弹簧力和阀针14所受的气压力会作用在凸台推力面11a和端板推力面10a之间，为了使丝杆8相对阀针14发生旋转，就需尽量减小端板部10和凸台11之间的摩擦力，一般可在端板推力面10a或凸台推力面11a上涂减摩涂层等方式得以实现，而阀针14和支撑部13之间设置有钢球15，在电子膨胀阀作动时，丝杆8会带动凸台11、弹簧12以及支撑部件13作为一个整体相对钢球15旋转，一般来说在作用力下钢球15也相对丝杆进行旋转，但因钢球15与支撑部13之间为点接触或线接触结构从而减少了转动，而后钢球15进一步将作用力施加给阀针14时，因钢球15与阀针14之间也为点接触或线接触作用，钢球15施加给阀针14的作用力也较小减少了阀针14在临界开阀点后或临界闭阀点后的作动中进行进一步旋转，需要说明的是钢球15与阀针14作为两个相对独立的元件可相对不转也可相对旋转，一般为相对不转，但即使相对旋转时，钢球15施加给 阀针14的作用力也非常小，减少了阀针14的旋转。减小了阀针14对阀口1a的磨损，同时钢球15的存在减小了支撑部13与阀针14互相之间的阻力，因钢球15的设置使支撑部13与阀针14之间存有一定的活动空间，在作动过程中当丝杆8存在一定的偏斜时可通过该活动空间调正，即钢球15对丝杆8还有调心作用防止丝杆作动过程中的偏斜。
下面参照图3，图3为本发明提供的另一种实施方式，该实施方式与上述实施方式所陈述的不同点为支撑部13和阀针14的用于与钢球15的配合结构，该实施方式中支撑部13的支撑凸缘部131设置有弧形槽部141a’，阀针14的凸缘部14a上开设有凹槽部1311’。该弧形槽部141a’和凹槽部13111’一起大体地将钢球15整体包裹并抵接。钢球15的直径大于弧形槽部141a’的深度或者钢球15的直径大于凹槽部13111’的深度。钢球15与阀针14之间形成点接触或线接触结构，其余相关元件结构和作用已在上述内容中进行一一描述，在此不再赘述。
需要说明的是本发明提供的技术方案重点在于保护套筒16内的相关元件结构以及丝杆8通过套筒16与阀针14之间进行浮动连接的结构，至于其他电子膨胀阀元件例如螺母、转子、阀座等不进行特殊限定，本发明提供的相关技术方案也可应用于其他类似的阀针由丝杆带动作轴向上的升降运动结构的电子膨胀阀结构中。
本发明通过在支撑部和阀针之间设置的钢球结构，一方面对丝杆起到调心作用，即使在丝杆发生一定偏斜时也通过相应的活动空间调正，另一方面钢球与支撑部之间或钢球与阀针之间为点接触或线接触结构，当电子膨胀阀进行作动时丝杆带动凸台、丝杆以及支撑部作为一个整体旋转作动时降低了与钢球之间的旋转扭力，而后钢球对阀针施加的作用力也进一步减小，进一步减少阀针对阀口的磨损。本文所述的上、下、左、右等方位名词，均是以图1所示的基准视图进行描述，并不应当理解为对本发明的限制。
以上对本发明所提供的电子膨胀阀进行了详细介绍。本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，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，还可以对本发明进行若 干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。

Claims (10)

  1. 电子膨胀阀，其特征在于，包括：
    阀座(1)，所述阀座(1)设有阀口(1a)并且所述阀座(1)内形成阀座腔；
    阀针(14)，所述阀针(14)可打开或关闭所述阀口(1a)以对流经所述阀口(1a)的冷媒进行流量调节；
    丝杆(8)，所述丝杆(8)通过套筒(16)与所述阀针(14)进行浮动连接；
    螺母(9)，所述螺母(9)与所述丝杆(8)通过螺纹进行配合；
    所述套筒(16)内还包括支撑部(13)，所述支撑部(13)和所述阀针(14)之间设置有钢球(15)。
  2. 根据权利要求1所述的电子膨胀阀，其特征在于，所述支撑部(13)包括支撑凸缘部(131)，所述阀针(14)包括凸缘部(14a)，所述支撑凸缘部(131)与所述凸缘部(14a)之间设置有钢球(15)
  3. 根据权利要求2所述的电子膨胀阀，其特征在于，所述支撑凸缘部(131)设有凹槽部(1311)，所述凸缘部(14a)设有弧形槽部(141a),所述凹槽部(1311)与所述弧形槽部(141a)大体包裹所述钢球(15)。
  4. 根据权利要求3所述的电子膨胀阀，其特征在于，所述钢球(15)的直径大于所述凹槽部(1311)或所述弧形槽部(141a)的深度，所述钢球(15)与所述凹槽部(1311)以及所述弧形槽部(141a)分别进行抵接。
  5. 根据权利要求2所述的电子膨胀阀，其特征在于，所述支撑凸缘部(131)设有弧形槽部(141a’)，所述凸缘部(14a)设有凹槽部(1311’)，所述弧形槽部(141a’)与所述凹槽部(1311’)大体包裹所述钢球(15)。
  6. 根据权利要求5所述的电子膨胀阀，其特征在于，所述钢球(15)的直径大于所述弧形槽部(1311’)或所述凹槽部(141a’)的深度，所述钢球(15)与所述弧形槽部(1311’)以及所述凹槽部(141a’)分别进行抵接。
  7. 根据权利要求2-6任意一项所述的电子膨胀阀，其特征在于，所述钢球(15)与所述支撑部(13)为点接触或线接触结构。
  8. 根据权利要求2-6任意一项所述的电子膨胀阀，其特征在于，所述钢球(15)与所述阀针(14)为点接触或线接触结构。
  9. 根据权利要求1所述的电子膨胀阀，其特征在于，所述套筒(16)具有套筒腔，所述套筒腔内设有端板部(10)、凸台(11)、弹簧(12)，所述弹簧由支撑部(13)进行支撑，所述端板部(10)设有端板推力面(10a)，所述凸台(11)设有凸台推力面(11a)，所述端板推力面(10a)与所述凸台推力面(11a)对向设置，所述凸台(11)固定连接于所述丝杆(8)，当电子膨胀阀作动时，所述丝杆(8)带动凸台(11)、弹簧(12)以及支撑部(13)一起旋转以使钢球(15)可相对丝杆(8)转动。
  10. 电子膨胀阀，其特征在于，包括：
    阀座(1)，所述阀座(1)设有阀口(1a)并且所述阀座(1)内形成阀座腔；
    阀针(14)，所述阀针(14)可打开或关闭所述阀口(1a)以对流经所述阀口(1a)的冷媒进行流量调节；
    丝杆(8)，所述丝杆(8)通过套筒(16)与所述阀针(14)进行浮动连接；
    螺母(9)，所述螺母(9)与所述丝杆(8)通过螺纹进行配合；
    所述套筒(16)具有套筒腔，所述套筒腔内设有端板部(10)、凸台(11)、弹簧(12)、支撑部(13)，所述弹簧由支撑部(13)进行支撑，所述支撑部(13)和所述阀针(14)之间设置有钢球(15)。
PCT/CN2018/106153 2017-09-18 2018-09-18 电子膨胀阀 WO2019052570A1 (zh)

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