WO2020233338A1 - 电子膨胀阀 - Google Patents

电子膨胀阀 Download PDF

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Publication number
WO2020233338A1
WO2020233338A1 PCT/CN2020/086493 CN2020086493W WO2020233338A1 WO 2020233338 A1 WO2020233338 A1 WO 2020233338A1 CN 2020086493 W CN2020086493 W CN 2020086493W WO 2020233338 A1 WO2020233338 A1 WO 2020233338A1
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WO
WIPO (PCT)
Prior art keywords
valve
sleeve
rod
valve head
electronic expansion
Prior art date
Application number
PCT/CN2020/086493
Other languages
English (en)
French (fr)
Inventor
詹少军
冯贵刚
何秋波
Original Assignee
浙江盾安人工环境股份有限公司
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
Application filed by 浙江盾安人工环境股份有限公司 filed Critical 浙江盾安人工环境股份有限公司
Priority to US17/606,765 priority Critical patent/US11953244B2/en
Priority to EP20809652.9A priority patent/EP3974689A4/en
Priority to KR1020217035871A priority patent/KR102409652B1/ko
Priority to JP2021549651A priority patent/JP7214883B2/ja
Publication of WO2020233338A1 publication Critical patent/WO2020233338A1/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
    • 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
    • F16K1/02—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 with screw-spindle
    • F16K1/04—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 with screw-spindle with a cut-off member rigid with the spindle, e.g. main valves
    • 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
    • F16K1/46—Attachment of sealing rings
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • 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
    • 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
    • F16K31/508—Mechanical actuating means with screw-spindle or internally threaded actuating means the actuating element being rotatable, non-rising, and driving a non-rotatable axially-sliding element
    • 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

  • This application relates to the technical field of valves, and specifically to an electronic expansion valve.
  • the connection structure of the valve head and the screw is complicated, so the processing procedures are cumbersome and the manufacturing cost is high; and the size of the valve head and the screw are relatively long, in order to ensure the life and strength of the product, it cannot be thinner and thinner. Therefore, the overall size of the current electronic expansion valve cannot be further compressed, which does not conform to the development trend of product miniaturization.
  • the application provides an electronic expansion valve to solve the problems of high manufacturing cost and large size of the electronic expansion valve in the prior art.
  • an electronic expansion valve including: a valve body, the valve body has a valve port; the valve head is movably arranged in the valve body, the valve head includes a valve head and a pressure sleeve, the valve head It has a containing cavity, one end of the containing cavity close to the valve port has a bottom wall, a through hole is provided on the bottom wall, and the valve head is used to block the valve port; the guide sleeve is arranged in the valve body, and the valve head penetrates the guide sleeve In; the driving part is movably arranged in the valve body, the end of the driving part penetrates the pressure sleeve, the end of the driving part and the pressure sleeve are provided with a channel, the channel, the containing cavity and the through hole together form a balance through the valve head The channel; the elastic piece is arranged in the containing cavity, one end of the elastic piece is matched with the bottom wall, and the other end of the elastic piece
  • the driving portion includes a rod-shaped member and a valve sleeve, the rod-shaped member can move axially, the end of the rod-shaped member is connected with the valve sleeve, the valve sleeve is matched with the end of the valve head away from the valve port, and the other elastic member One end abuts against the valve sleeve.
  • valve sleeve is fixed at the end of the rod-shaped member, the outer peripheral surface of the valve sleeve has a first limit step, and the other end of the elastic member abuts the first limit step.
  • one end of the valve head away from the valve port has an opening communicating with the containing cavity, the compression sleeve is arranged at the opening, and the valve sleeve abuts against the compression sleeve.
  • the rod-shaped member penetrates through the compression sleeve, the outer peripheral surface of the compression sleeve has a second limit step, a part of the compression sleeve penetrates the accommodating cavity, and the end surface of the valve head abuts the second limit step.
  • first escape hole between the inner wall of the valve sleeve and the rod-shaped member
  • second escape hole is provided between the inner wall of the compression sleeve and the rod-shaped member.
  • the first escape hole and the second escape hole form a passage, and the through hole, The accommodating cavity, the first avoiding hole and the second avoiding hole are sequentially connected.
  • the rod-shaped member includes a first rod section and a second rod section connected to each other, the cross-sectional area of the second rod section is smaller than the cross-sectional area of the first rod section, and the second rod section penetrates the pressure sleeve and the valve sleeve.
  • the radial cross section of the second rod segment is arcuate.
  • the driving part has an external thread
  • the electronic expansion valve further includes a nut assembly, the nut assembly has an internal thread, and the external thread is matched with the internal thread.
  • the length of the end of the driving part penetrating into the valve head is less than or equal to half of the length of the valve head.
  • the valve head can be driven to move by the driving part to block or open the valve port by the valve head, and force can be applied to the valve head by the elastic member to improve the sealing when the valve port is blocked. Sex. Since the end of the driving part is matched with the end of the valve head away from the valve port, the elastic member is located between the end of the driving part and the bottom wall of the accommodating cavity of the valve head, so the length of the valve head and the driving part can be reduced , The structure is simplified, the processing procedure can be simplified, the processing difficulty is reduced, and the manufacturing cost of the electronic expansion valve is reduced.
  • the channel formed by the end of the driving part and the cavity in the compression sleeve, the receiving cavity and the through hole of the valve head form a balance channel penetrating the valve head, so that the area at both ends of the valve head can be maintained
  • the pressure is balanced, and the product size can be made smaller.
  • the valve head can be guided by the guide sleeve, and the seal can be improved to avoid internal leakage.
  • Figure 1 shows a cross-sectional view of an electronic expansion valve provided by an embodiment of the present application
  • Figure 2 shows a perspective view of the electronic expansion valve in Figure 1;
  • Fig. 3 shows a schematic diagram of a part of the parts in Fig. 1.
  • Valve body 11. Valve port; 21. Valve head; 211. Through hole; 22. Press sleeve; 221. Second avoidance hole; 31. Rod-shaped member; 311. First rod section; 312. Second rod 32, valve sleeve; 321, first escape hole; 40, elastic member; 50, nut assembly; 60, guide sleeve; 71, first cavity; 72, second cavity; 80, seal.
  • the embodiments of the present application provide an electronic expansion valve, including: a valve body 10 having a valve port 11; and a valve head movably disposed in the valve body 10,
  • the valve head includes a valve head 21 and a compression sleeve 22.
  • the valve head 21 has a containing cavity.
  • One end of the containing cavity close to the valve port 11 has a bottom wall.
  • the bottom wall is provided with a through hole 211.
  • the valve head 21 is used to block the valve port.
  • the driving part is movably arranged in the valve body 10, the end of the driving part penetrates the pressure sleeve 22, the end of the driving part and the pressure sleeve 22 are provided with a channel, the channel, the receiving cavity and the through hole 211 together form a through The balance channel of the valve head;
  • the elastic member 40 is arranged in the containing cavity, one end of the elastic member 40 is matched with the bottom wall, and the other end of the elastic member 40 can be compressed by the end of the driving part.
  • the valve head can be driven to move by the driving part to block or open the valve port 11 of the valve body 10 through the valve head 21, and force can be applied to the valve head through the elastic member 40 to Improve the sealing performance when blocking the valve port. Since the end of the driving part is matched with the end of the valve head away from the valve port 11, the elastic member 40 is located between the end of the driving part and the bottom wall of the accommodating cavity of the valve head, so that the valve head and the driving part can be lowered. Length, simplify the structure, which can simplify the processing procedures, reduce the processing difficulty, and reduce the manufacturing cost of the electronic expansion valve.
  • the channel formed by the end of the driving part and the cavity in the compression sleeve 22, the accommodating cavity of the valve head 21, and the through hole 211 of the valve head 21 form a balanced channel penetrating the valve head, so that the valve The area at both ends of the head maintains pressure balance while also making the product size smaller.
  • the fluid pressures in the areas at both ends of the valve head can be made consistent, so that when the valve head blocks the valve port 11, it can avoid that the pressure difference between the two sides of the valve head causes the sealing to be loose. Moreover, this facilitates the opening of the valve port 11.
  • the electronic expansion valve further includes a guide sleeve 60 arranged in the valve body 10, and the valve head is inserted in the guide sleeve 60.
  • the valve head 21 can be guided by the guide sleeve 60.
  • the electronic expansion valve further includes a sealing element 80 arranged between the valve head and the guide sleeve 60.
  • the seal 80 can improve the sealing performance and avoid internal leakage.
  • the inner wall of the guide sleeve 60 has an annular groove, and an annular seal 80 is provided in the annular groove.
  • the outer wall of the valve head 21 can be sealed by the annular seal 80 to ensure the sealing performance of the electronic expansion valve.
  • the length of the end of the driving part penetrating into the valve head is less than or equal to half of the length of the valve head, which can reduce the length of the driving part and facilitate processing.
  • valve head 21 is cylindrical, and the containing cavity is a round hole shape, which makes the valve head 21 simple in structure and convenient for processing and assembly with related parts.
  • the driving part includes a rod 31 and a valve sleeve 32, the rod 31 can move axially, the end of the rod 31 is connected to the valve sleeve 32, and the valve sleeve 32 is away from the valve head.
  • One end of the port 11 is matched, and the other end of the elastic member 40 abuts against the valve sleeve 32.
  • the valve sleeve 32 can be moved by the movement of the rod-shaped member 31.
  • the valve head can be moved to block the valve port 11, and the valve sleeve 32 is moving away from the valve port.
  • the valve head can be driven to move to open the valve port 11.
  • the valve sleeve 32 is fixed to the end of the rod-shaped member 31, the outer peripheral surface of the valve sleeve 32 has a first limit step, and the other end of the elastic member 40 abuts the first limit step.
  • the elastic member 40 can be positioned and limited by the first limiting step.
  • the valve sleeve 32 can prevent the rod-shaped member 31 from directly contacting the elastic member 40 and reduce the wear of the rod-shaped member 31.
  • the valve sleeve 32 can be connected to the end of the rod-shaped member 31 by means of laser welding, which is convenient for processing and has a firm connection.
  • the elastic member 40 may be configured as a spring.
  • the structure of the electronic expansion valve can be simplified, the axial size of the driving part can be reduced, and the overall length of the electronic expansion valve can be reduced, thereby making the structure of the electronic expansion valve more compact and achieving miniaturization.
  • the end of the valve head 21 away from the valve port 11 has an opening communicating with the accommodating cavity, the compression sleeve 22 is disposed at the opening, and the valve sleeve 32 abuts against the compression sleeve 22. In this way, the valve sleeve 32 can be restricted by the compression sleeve 22 so that the valve sleeve 32 is driven by the rod 31 to move away from the valve port 11 to drive the valve head to move.
  • the compression sleeve 22 and the valve head 21 can be assembled by the second limit step, which facilitates the positioning and assembly of the compression sleeve 22 and the valve head 21.
  • the compression sleeve 22 and the valve head 21 can be connected by laser welding, which is convenient for operation and a firm connection.
  • the second limiting step includes a narrow part penetrating into the containing cavity and a wide part contacting the upper end surface of the valve head 21.
  • first escape hole 321 between the inner wall of the valve sleeve 32 and the rod-shaped member 31, and a second escape hole 221 is provided between the inner wall of the pressure sleeve 22 and the rod-shaped member 31.
  • the hole 321 and the second escape hole 221 jointly form the aforementioned channel.
  • the through hole 211, the accommodating cavity, the first avoiding hole 321 and the second avoiding hole 221 are connected in sequence. In this way, the through hole 211, the accommodating cavity, the first avoiding hole 321 and the second avoiding hole 221 can form a balance channel, so that the areas at both ends of the valve head are connected.
  • the valve head 21 is cylindrical and has a stepped hole in the valve head 21, wherein a hole with a larger diameter forms a receiving cavity, and a hole with a smaller diameter forms a through hole 211. In this way, the structure of the valve head 21 can be simplified, and the valve sleeve 32 and the pressure sleeve 22 are also easy to process and assemble.
  • the rod-shaped member 31 includes a first rod section 311 and a second rod section 312 that are connected to each other.
  • the cross-sectional area of the second rod section 312 is smaller than that of the first rod section 311.
  • the cross section of the first rod section 311 in the axial direction is circular
  • the second rod section 312 is partially cut off on the basis of the first rod section 311, and the cross section in the axial direction is arcuate.
  • the rod section 312 passes through the compression sleeve 22 and the valve sleeve 32.
  • the first escape hole 321 is provided between the inner wall of the valve sleeve 32 and the second rod section 312, and the inner wall of the compression sleeve 22 and the second rod section 312 are provided between The second escape hole 221 described above.
  • an integrally formed rod can be used as the rod-shaped member 31, and a part of the rod-shaped member 31 is cut off in the axial direction to form the second rod section 312, which is convenient for processing and has low manufacturing cost.
  • the cross section of the second rod section 312 may also be a fan shape of any area or other irregular patterns, and the cross section is preferably smaller than that of the first rod section 311.
  • the cross-sectional area of the second rod section 312 may also be greater than the cross-sectional area of the first rod section 311, as long as a gap is formed between the second rod section 312, the pressure sleeve 22 and the valve sleeve 32, the objective of this solution can be achieved.
  • the lower end of the second rod section 312 has a third limit step, the end surface of the third limit step is flush with the end surface of the pressure sleeve 22, and the end surface of the valve sleeve 32 is flush with the end surface of the third limit step Abut.
  • the valve sleeve 32 is fixedly installed on the third limit step and moves with the movement of the rod 31. When the valve sleeve 32 moves upward to the position of the pressure sleeve 22, it can drive the valve head 21 fixed with the pressure sleeve 22 together Move upward to open the valve port 11.
  • the radial cross section of the second rod segment 312 is arcuate. This facilitates the processing of the second rod section 312.
  • the radial cross section of the second rod section 312 may be set to a superior arc bow.
  • the driving part has an external thread
  • the electronic expansion valve further includes a nut assembly 50 having an internal thread
  • the external thread is matched with the internal thread.
  • the electronic expansion valve further includes a magnetic rotor, which can drive the driving part to rotate. The threaded cooperation between the driving part and the nut assembly 50 can cause the driving part to move axially, thereby driving the valve head to move.
  • the external thread is located on the rod 31.
  • the area between the guide sleeve 60, the rod 31, the compression sleeve 22, and the nut assembly 50 is the first cavity 71, and the part where the valve port 11 is located below the valve head 21 is the second cavity.
  • the cavity 72 can communicate with the first cavity 71 and the second cavity 72 through the through hole 211, the receiving cavity, the first escape hole 321 and the second escape hole 221.

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

Abstract

一种电子膨胀阀，包括：阀体（10），阀体具有阀口（11）；阀头部，可移动地设置在阀体内，阀头部包括阀头（21）和压套（22），阀头具有容纳腔，容纳腔的靠近阀口的一端具有底壁，底壁上设有通孔（211），阀头用于封堵阀口；导向套（60），设置在阀体中，阀头部穿设在导向套中；驱动部，可移动地设置在阀体内，驱动部的端部贯穿压套，驱动部的端部和压套上设有通道，通道、容纳腔和通孔共同形成贯穿阀头部的平衡通道；弹性件（40），设置在容纳腔内，弹性件的一端与底壁配合，弹性件的另一端能够被驱动部的端部压缩；密封件（80），密封件设置在阀头部和导向套之间。该电子膨胀阀能够解决现有技术中的电子膨胀阀制造成本高以及尺寸大的问题。

Description

电子膨胀阀 技术领域
本申请涉及阀门技术领域，具体而言，涉及一种电子膨胀阀。
背景技术
现有的电子膨胀阀中，阀头与螺杆连接结构复杂，因而加工工序繁琐，制造成本高；并且阀头和螺杆的尺寸均较长，为了保证产品寿命及强度也无法做到更薄更细，因此使得目前的电子膨胀阀的整体尺寸无法进一步压缩，不符合产品的小型化发展趋势。
发明内容
本申请提供了一种电子膨胀阀，以解决现有技术中的电子膨胀阀制造成本高、尺寸大的问题。
为了解决上述问题，本申请提供了一种电子膨胀阀，包括：阀体，阀体具有阀口；阀头部，可移动地设置在阀体内，阀头部包括阀头和压套，阀头具有容纳腔，容纳腔的靠近阀口的一端具有底壁，底壁上设有通孔，阀头用于封堵阀口；导向套，设置在阀体中，阀头部穿设在导向套中；驱动部，可移动地设置在阀体内，驱动部的端部贯穿压套，驱动部的端部和压套上设有通道，通道、容纳腔和通孔共同形成贯穿阀头部的平衡通道；弹性件，设置在容纳腔内，弹性件的一端与底壁配合，弹性件的另一端能够被驱动部的端部压缩；密封件，密封件设置在阀头部和导向套之间。
进一步地，驱动部包括杆状件和阀套，杆状件能够轴向移动，杆状件的端部与阀套连接，阀套与阀头部的远离阀口的一端配合，弹性件的另一端与阀套抵接。
进一步地，阀套固定在杆状件的端部，阀套的外周面具有第一限位台阶，弹性件的另一端与第一限位台阶抵接。
进一步地，阀头的远离阀口的一端具有与容纳腔连通的开口，压套设置在开口处，阀套与压套抵接。
进一步地，杆状件穿设通过压套，压套的外周面具有第二限位台阶，压套的一部分穿设在容纳腔中，阀头的端面与第二限位台阶抵接。
进一步地，阀套的内壁与杆状件之间具有第一避让孔，压套的内壁与杆状件之间具有第二避让孔，第一避让孔和第二避让孔形成通道，通孔、容纳腔、第一避让孔和第二避让孔顺次连通。
进一步地，杆状件包括相互连接的第一杆段和第二杆段，第二杆段的横截面积小于第一杆段的横截面积，第二杆段穿设在压套和阀套中，阀套的内壁与第二杆段之间具有第一避让孔，压套的内壁与第二杆段之间具有第二避让孔。
进一步地，第二杆段的径向截面为弓形。
进一步地，驱动部具有外螺纹，电子膨胀阀还包括：螺母组件，螺母组件具有内螺纹，外螺纹与内螺纹配合。
进一步地，驱动部的端部穿入阀头部内的长度小于或等于阀头部长度的一半。
应用本申请的技术方案，可通过驱动部来驱动阀头部移动，以通过阀头封堵或打开阀口，通过弹性件可对阀头部施加作用力，以在封堵阀口时提高密封性。由于驱动部的端部与阀头部的远离阀口的一端配合，弹性件位于驱动部的端部与阀头部的容纳腔的底壁之间，因此能够降低阀头部和驱动部的长度，简化结构，从而可以简化加工工序，降低加工难度，降低了电子膨胀阀的制造成本。而且，通过驱动部的端部和压套内的空腔共同形成的通道、容纳腔以及阀头的通孔，形成了贯穿阀头部的平衡通道，这样可使得阀头部的两端的区域保持压力平衡，同时还能将产品尺寸做到更小。通过导向套可对阀头进行导向，通过密封件可提高密封性，避免内泄。
附图说明
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1示出了本申请的实施例提供的电子膨胀阀的剖视图；
图2示出了图1中的电子膨胀阀的立体图；
图3示出了图1中的一部分零件的结构示意图。
其中，上述附图包括以下附图标记：
10、阀体；11、阀口；21、阀头；211、通孔；22、压套；221、第二避让孔；31、杆状件；311、第一杆段；312、第二杆段；32、阀套；321、第一避让孔；40、弹性件；50、螺母组件；60、导向套；71、第一腔体；72、第二腔体；80、密封件。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本申请及其应用或使用的任何限制。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
如图1至图3所示，本申请的实施例提供了一种电子膨胀阀，包括：阀体10，阀体10具有阀口11；阀头部，可移动地设置在阀体10内，阀头部包括阀头21和压套22，阀头21具有容纳腔，容纳腔的靠近阀口11的一端具有底壁，底壁上设有通孔211，阀头21用于封堵阀口11；驱动部，可移动地设置在阀体10内，驱动部的端部贯穿压套22，驱动部的端部和压套22上设有通道，通道、容纳腔和通孔211共同形成贯穿阀头部的平衡通道；弹性件40，设置在容纳腔内，弹性件40的一端与底壁配合，弹性件40的另一端能够被驱动部的端部压缩。
应用本实施例的技术方案，可通过驱动部来驱动阀头部移动，以通过阀头21封堵或打开阀体10的阀口11，通过弹性件40可对阀头部施加作用力，以在封堵阀口时提高密封性。由于驱动部的端部与阀头部的远离阀口11的一端配合，弹性件40位于驱动部的端部与阀头部的容纳腔的底壁之间，因此能够降低阀头部和驱动部的长度，简化结构，从而可以简化加工工序，降低加工难度，降低了电子膨胀阀的制造成本。而且，通过驱动部的端部和压套22内的空腔共同形成的通道、阀头21的容纳腔以及阀头21的通孔211，形成了贯穿阀头部的平衡通道，这样可使得阀头部的两端的区域保持压力平衡，同时还能将产品尺寸做到更小。通过设置平衡通道，可使得阀头部的两端的区域内的流体压力一致，这样当阀头部将阀口11封堵之后可避免由于阀头部两侧有压力差而造成封堵不严。而且，这样便于打开阀口11。
电子膨胀阀还包括：导向套60，设置在阀体10中，阀头部穿设在导向套60中。通过导向套60可对阀头21进行导向。
在本实施例中，电子膨胀阀还包括：密封件80，密封件80设置在阀头部和导向套60之间。通过密封件80可提高密封性，避免内泄。具体地，导向套60的内壁上具有环形凹槽，环形凹槽内具有环形密封件80，通过环形密封件80可对阀头21的外壁进行密封，以保证电子膨胀阀的密封性。
在本实施例中，驱动部的端部穿入阀头部内的长度小于或等于阀头部的长度的一半，这样可以减小驱动部的长度，便于加工。
在本实施例中，阀头21为圆柱状，容纳腔为圆孔状，这使得阀头21结构简单，便于加工以及与相关零部件的装配。
在本实施例中，驱动部包括杆状件31和阀套32，杆状件31能够轴向移动，杆状件31的端部与阀套32连接，阀套32与阀头部的远离阀口11的一端配合，弹性件40的另一端与阀套32抵接。这样可通过杆状件31的移动带动阀套32移动，阀套32在向靠近阀口11的方向移动时，可带动阀头部移动以封堵阀口11，阀套32在向远离阀口11的方向移动时，可带动阀头部移动以打开阀口11。
如图1所示，阀套32固定在杆状件31的端部，阀套32的外周面具有第一限位台阶，弹性件40的另一端与第一限位台阶抵接。通过第一限位台阶可对弹性件40进行定位和限位。而且，通过阀套32可避免杆状件31与弹性件40直接接触，减少杆状件31的磨损。具体地，阀套32可通过激光焊接的方式与杆状件31的端部连接，此种方式便于加工，连接牢固。在本实施例中，弹性件40可以设置为弹簧。
采用上述技术方案，不但能简化电子膨胀阀的结构，还能够使得驱动部的轴向尺寸减小，电子膨胀阀的整体长度减小，从而使电子膨胀阀的结构更加紧凑，实现小型化。
在本实施例中，阀头21的远离阀口11的一端具有与容纳腔连通的开口，压套22设置在开口处，阀套32与压套22抵接。这样可通过压套22对阀套32进行限位，以使阀套32在杆状件31的驱动下朝远离阀口11移动时带动阀头部移动。
具体地，杆状件31的前端穿设通过压套22，压套22的外周面具有第二限位台阶，压套22的一部分穿设在容纳腔中，阀头21的端面与第二限位台阶抵接。这样可通过第二限位台阶对压套22与阀头21进行限位装配，便于压套22与阀头21的定位和装配。优选地，可通过激光焊接将压套22与阀头21连接，这样便于操作，连接牢固。具体地，第二限位台阶包括穿设进入容纳腔中的窄部和与阀头21的上端面相抵接的宽部。
具体地，在本实施例中，阀套32的内壁与杆状件31之间具有第一避让孔321，压套22的内壁与杆状件31之间具有第二避让孔221，第一避让孔321和第二避让孔221共同形成上述通道。通孔211、容纳腔、第一避让孔321和第二避让孔221顺次连通。这样可通过通孔211、容纳腔、第一避让孔321和第二避让孔221组成平衡通道，使得阀头部的两端的区域连通。采用上述方式，可利用阀套32和压套22上的孔，便于加工。在本实施例中，阀头21为圆柱形，在阀头21内具有阶梯孔，其中直径较大的孔形成容纳腔，直径较小的孔形成通孔211。采用此种方式可简化阀头21的结构，阀套32和压套22等也便于加工和装配。
在本实施例中，杆状件31包括相互连接的第一杆段311和第二杆段312，在轴向上，第二杆段312的横截面积小于第一杆段311的横截面积。本实施例中，第一杆段311在轴向上的横截面为圆形、第二杆段312在第一杆段311的基础上切除一部分，在轴向上的横截面为弓形，第二杆段312穿设在压套22和阀套32中，阀套32的内壁与第二杆段312之间具有上述第一避让孔321，压套22的内壁与第二杆段312之间具有上述第二避让孔221。在加工时，可采用一根一体成型的杆作为杆状件31，从杆状件31的一端沿轴向切削掉一部分制作出第二杆段312，这样便于加工，制造成本低。
在其他未图示出的实施例中，第二杆段312的横截面也可为任意面积的扇形或者其他不规则的图形，其横截面比第一杆段311小为佳。当然第二杆段312的横截面积也可以大于第一杆段311的横截面积，只要第二杆段312与压套22、阀套32之间形成间隙即可达到本方案的目的。
在本实施例中，第二杆段312的下端部具有第三限位台阶，第三限位台阶的端面与压套22的端面平齐，阀套32的端面与第三限位台阶的端面抵接。这样便于第二杆段312、压套22和阀套32的定位和装配。阀套32固定安装于第三限位台阶上，并随杆状件31的运动而运动，当阀套32朝上运动到压套22位置时，可带动与压套22固定的阀头21一起向上运动，以打开阀口11。
进一步地，在本实施例中，第二杆段312的径向截面为弓形。这样便于第二杆段312的加工，为了保证第二杆段312的结构强度，可以将第二杆段312的径向截面设置为优弧弓。
在本实施例中，驱动部具有外螺纹，电子膨胀阀还包括：螺母组件50，螺母组件50具有内螺纹，外螺纹与内螺纹配合。在本实施例中，电子膨胀阀还包括磁转子，磁转子可带动驱动部转动，通过驱动部与螺母组件50的螺纹配合可使得驱动部发生轴向移动，从而带动阀头部移动。具体地，外螺纹位于杆状件31上。
如图3所示，导向套60、杆状件31、压套22和螺母组件50之间的区域为第一腔体71，阀口11所在的孔位于阀头21的下方的部分为第二腔体72，通过通孔211、容纳腔、第一避让孔321和第二避让孔221可将第一腔体71和第二腔体72连通。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种电子膨胀阀，其特征在于，包括：
    阀体(10)，所述阀体(10)具有阀口(11)；
    阀头部，可移动地设置在所述阀体(10)内，所述阀头部包括阀头(21)和压套(22)，所述阀头(21)具有容纳腔，所述容纳腔的靠近所述阀口(11)的一端具有底壁，所述底壁上设有通孔(211)，所述阀头(21)用于封堵所述阀口(11)；
    导向套(60)，设置在所述阀体(10)中，所述阀头部穿设在所述导向套(60)中；
    驱动部，可移动地设置在所述阀体(10)内，所述驱动部的端部贯穿所述压套(22)，所述驱动部的端部和所述压套(22)上设有通道，所述通道、所述容纳腔和所述通孔(211)共同形成贯穿所述阀头部的平衡通道；
    弹性件(40)，设置在所述容纳腔内，所述弹性件(40)的一端与所述底壁配合，所述弹性件(40)的另一端能够被所述驱动部的端部压缩；
    密封件(80)，所述密封件(80)设置在所述阀头部和所述导向套(60)之间。
  2. 根据权利要求1所述的电子膨胀阀，其特征在于，所述驱动部包括杆状件(31)和阀套(32)，所述杆状件(31)能够轴向移动，所述杆状件(31)的端部与所述阀套(32)连接，所述阀套(32)与所述阀头部的远离所述阀口(11)的一端配合，所述弹性件(40)的另一端与所述阀套(32)抵接。
  3. 根据权利要求2所述的电子膨胀阀，其特征在于，所述阀套(32)固定在所述杆状件(31)的端部，所述阀套(32)的外周面具有第一限位台阶，所述弹性件(40)的另一端与所述第一限位台阶抵接。
  4. 根据权利要求2所述的电子膨胀阀，其特征在于，所述阀头(21)的远离所述阀口(11)的一端具有与所述容纳腔连通的开口，所述压套(22)设置在所述开口处，所述阀套(32)与所述压套(22)抵接。
  5. 根据权利要求4所述的电子膨胀阀，其特征在于，所述杆状件(31)穿设通过所述压套(22)，所述压套(22)的外周面具有第二限位台阶，所述压套(22)的一部分穿设在所述容纳腔中，所述阀头(21)的端面与所述第二限位台阶抵接。
  6. 根据权利要求2所述的电子膨胀阀，其特征在于，所述阀套(32)的内壁与所述杆状件(31)之间具有第一避让孔(321)，所述压套(22)的内壁与所述杆状件(31)之间具有第二避让孔(221)，所述第一避让孔(321)和所述第二避让孔(221)形成所述通道，所述通孔(211)、所述容纳腔、所述第一避让孔(321)和所述第二避让孔(221)顺次连通。
  7. 根据权利要求6所述的电子膨胀阀，其特征在于，所述杆状件(31)包括相互连接的第一杆段(311)和第二杆段(312)，所述第二杆段(312)的横截面积小于所述第一杆段(311) 的横截面积，所述第二杆段(312)穿设在所述压套(22)和所述阀套(32)中，所述阀套(32)的内壁与所述第二杆段(312)之间具有所述第一避让孔(321)，所述压套(22)的内壁与所述第二杆段(312)之间具有所述第二避让孔(221)。
  8. 根据权利要求7所述的电子膨胀阀，其特征在于，所述第二杆段(312)的径向截面为弓形。
  9. 根据权利要求1所述的电子膨胀阀，其特征在于，所述驱动部具有外螺纹，所述电子膨胀阀还包括：
    螺母组件(50)，所述螺母组件(50)具有内螺纹，所述外螺纹与所述内螺纹配合。
  10. 根据权利要求1至9任意一项所述的电子膨胀阀，其特征在于，所述驱动部的端部穿入所述阀头部内的长度小于或等于所述阀头部长度的一半。
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