WO2020259657A1 - 一种电子膨胀阀 - Google Patents

一种电子膨胀阀 Download PDF

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Publication number
WO2020259657A1
WO2020259657A1 PCT/CN2020/098381 CN2020098381W WO2020259657A1 WO 2020259657 A1 WO2020259657 A1 WO 2020259657A1 CN 2020098381 W CN2020098381 W CN 2020098381W WO 2020259657 A1 WO2020259657 A1 WO 2020259657A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve needle
spring
electronic expansion
expansion valve
valve
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2020/098381
Other languages
English (en)
French (fr)
Inventor
魏先让
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Sanhua Intelligent Controls Co Ltd
Original Assignee
Zhejiang Sanhua Intelligent Controls Co Ltd
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 Zhejiang Sanhua Intelligent Controls Co Ltd filed Critical Zhejiang Sanhua Intelligent Controls Co Ltd
Priority to US17/439,452 priority Critical patent/US12140354B2/en
Priority to KR1020217033717A priority patent/KR102578174B1/ko
Priority to CN202080013132.1A priority patent/CN113748286B/zh
Priority to JP2021556963A priority patent/JP7385673B2/ja
Priority to EP20832134.9A priority patent/EP3992500A4/en
Publication of WO2020259657A1 publication Critical patent/WO2020259657A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—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
    • 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
    • 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
    • F16K1/38—Valve members of conical shape
    • 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
    • F16K1/48—Attaching valve members to screw-spindles
    • 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
    • F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
    • 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
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the technical field of refrigeration control, in particular to an electronic expansion valve.
  • FIG. 1 shows a typical valve needle assembly structure of an electronic expansion valve.
  • the valve needle assembly of the electronic expansion valve has a screw 16', and the screw 16' and the valve needle 5'are floatingly connected through a sleeve 25'; A second gasket 27' is provided between the valve needle 5'and the 25'.
  • the sleeve 25' is equipped with a compression spring 8', the upper end of the compression spring 8'abuts against the bushing at the lower end of the screw rod 16', and the lower end surface of the spring 8'abuts against the bearing 24'.
  • valve needle screw assembly whose spring is not easy to deflect.
  • the object of the present invention is to provide an electronic expansion valve whose spring is not easy to deflect.
  • an electronic expansion valve which is characterized by comprising a valve needle screw assembly, the valve needle screw assembly including a washer part, a spring, and a screw assembly, the screw assembly including Screw rod, the spring is sheathed on the screw rod;
  • the screw assembly includes a lower stop part and an upper stop part, the lower stop part includes a lower flange part or a body part, and the lower stop part or the body part can abut against the washer part.
  • the upper stopping portion includes an upper flange portion and/or an upper retaining ring, and the upper flange portion and/or the upper retaining ring abuts against the spring;
  • the lower end of the spring abuts against the washer part.
  • the spring is sheathed on the screw rod, and the upper end of the spring abuts against the upper stop part, the lower end of the spring abuts against the lower stop part, and the spring cooperates with the screw rod assembly.
  • the spring of the valve needle screw assembly is not easy to deflect.
  • Figure 1 is a typical valve needle assembly structure of an electronic expansion valve
  • FIG. 2 is a cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state
  • FIG. 3 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • FIG. 4 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the valve needle and the valve port sealing part just contact;
  • FIG. 5 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the spring has not been further compressed at the critical point;
  • FIG. 6 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state
  • Figure 7 is a cross-sectional view of the valve needle screw assembly in Figure 2;
  • Figure 8 is an exploded view of the valve needle screw assembly in Figure 7;
  • FIG. 9 is a partial cross-sectional view of the second embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • FIG. 10 is a partial cross-sectional view of the third embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • FIG. 11 is a partial cross-sectional view of the fourth embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • FIG. 12 is a partial cross-sectional view of the fifth embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • FIG. 13 is a partial cross-sectional view of the sixth embodiment of the electronic expansion valve provided by the present invention when it is fully opened;
  • Fig. 14 is a partial cross-sectional view of the seventh embodiment of the electronic expansion valve provided by the present invention in a fully open state;
  • FIG. 15 is a partial cross-sectional view of the eighth embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • 16 is a partial cross-sectional view of the ninth embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • Valve needle screw assembly 11, valve needle; 111, valve needle sealing part; 12, valve needle sleeve; 121, matching part; 122, peripheral wall part; 13, gasket part; 14, spring; 15, screw assembly 151, screw rod; 1511, lower spring groove; 1512, valve needle support groove; 1513, valve needle support flange; 1514, spring upper ring groove, spring upper ring groove; 153, lower stop 1531, lower flange portion; 154, valve needle support portion; 1541, valve needle support washer; 155, upper stop portion; 1551, upper flange portion; 1552, upper retaining ring; 156, bushing part; 1561 1562.
  • Valve seat 211. Valve port; 2111. Valve port sealing part; 212. Internal control guide 22, the first connecting part; 23, the second connecting part; 24, the guide seat; 241, the inner hole guide part; 25, the connecting seat; 3. the nut assembly; 31, the nut; 32, the nut connecting part; 33. Sliding ring; 4. Rotor assembly; 41. Rotor magnet; 42. Rotor connecting part; 43. Rotor stop part; 5. Shell; 30. Stator coil;
  • Figure 2 is a cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state
  • Figure 3 is a cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully open state Partial cross-sectional view
  • FIG. 4 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the valve needle and the valve port sealing part just contact
  • FIG. 5 is the first embodiment of the electronic expansion valve provided by the present invention.
  • Figure 6 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state
  • Figure 7 is a cross-sectional view of the valve needle screw assembly in Figure 2
  • Figure 8 is Figure 7. Exploded view of the middle valve needle screw assembly.
  • Figure 2 is a cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state.
  • the electronic expansion valve provided by the present invention consists of a valve body 20 and a stator coil 30. constitute.
  • the valve body 20 includes a valve needle screw assembly 1, a valve seat assembly 2, a nut assembly 3, a rotor assembly 4 and a housing 5.
  • the stator coil 30 of the electronic expansion valve is connected to the drive controller. After the drive controller is energized, it sends a pulse drive signal to the stator coil 30.
  • the stator coil 30 generates a periodically changing magnetic field to drive the rotor assembly 4 of the electronic expansion valve to perform a forward or In reverse rotation, the rotor assembly 4 is fixedly connected to the screw rod 151 of the valve pin screw assembly 1, and the rotor assembly 4 will synchronously drive the screw rod 151 to rotate when it rotates.
  • the screw rod 151 of the valve needle screw assembly 1 is provided with an external thread, and the inner hole of the nut 31 of the nut assembly 3 is provided with an internal thread.
  • the screw rod 151 and the nut 31 are threaded, and the rotor assembly 4 rotates while the wire
  • the rod 151 will move along the axial direction, thereby driving the valve needle screw assembly 1 to realize the opening and closing action of the valve port 211.
  • the valve seat assembly 2 provided in this embodiment includes a valve seat 21, a first connecting portion 22, a second connecting portion 23, a guide seat 24, and a connecting seat 25.
  • the first connecting portion 22, the second connecting portion 23, and the guide seat 24 And the connecting seat 25 and the valve seat 21 are fixedly assembled.
  • the first connecting portion 22 and the second connecting portion 23 serve as the inflow or outflow channel of the fluid medium of the electronic expansion valve, and are generally used to connect with the system pipeline when the electronic expansion valve is installed in a refrigeration or heating system such as an air conditioner.
  • the valve seat 21 is provided with a valve port 211 at a position close to the center of the second connecting portion 23, and a valve port sealing portion 2111 is provided on the upper edge of the valve port 211.
  • the center inner hole of the guide seat 24 of the valve seat assembly 1 is provided with an inner hole guide portion 241 that matches the outer wall of the valve needle screw assembly.
  • the inner hole guide portion 241 is the valve needle
  • the screw assembly provides a guiding function.
  • a nut assembly 3 is arranged concentrically.
  • the nut assembly 3 includes a nut 31, a nut connecting body 32, a sliding ring 33 and a spiral guide 34.
  • the nut 31 can be fixedly connected to the valve seat assembly 3 through the nut connecting body 32 by welding or the like.
  • On the outer circle of the nut 31 on the upper side a sliding ring 33 and a spiral guide 34 are provided.
  • the sliding ring 33 can spirally rotate along the spiral guide 34 within the upper and lower stroke limits.
  • the sliding ring 33 and the spiral guide 34 are connected to the rotor Component 4 cooperates to realize the stroke control of the electronic expansion valve from fully open to fully closed.
  • the rotor assembly 4 includes a rotor magnet 41, a rotor connecting portion 42, and a rotor stopper 43 (the rotor stopper 43 and the rotor magnet 41 can be integrally formed, and a separate assembly method is adopted in this embodiment).
  • the rotor assembly 4 can be fixedly connected to the screw 151 of the valve pin screw assembly 1 through the rotor connecting body 42 (for example, welding connection can be adopted).
  • the rotor assembly 4 is driven by the stator coil 60 to drive the screw 151 to rotate synchronously.
  • a rotor stop part 43 is provided inside the rotor assembly 4, and the rotor stop part 43 cooperates with the sliding ring 33 on the nut 31 and the spiral guide 34 to limit the rotation of the rotor assembly 4 within a prescribed stroke range.
  • the electronic expansion valve provided by this embodiment also includes a housing 5 with an open end, which is sleeved on the outside of the rotor assembly 4.
  • the opening of the housing 5 is welded and sealed with the connecting seat 25 on the upper side of the valve seat assembly 2 to form a closed containment. Cavity.
  • the valve needle screw assembly 1 mainly includes a valve needle 11, a valve needle sleeve 12, a gasket portion 13, a spring 14 and a screw assembly 15.
  • Figure 7 is a cross-sectional view of the valve needle screw assembly
  • Figure 8 is an exploded view of the valve needle screw assembly
  • valve needle 11 and the valve needle sleeve 12 can be fixedly connected by welding or the like.
  • One end of the valve needle 11 includes a valve needle sealing portion 111, which is used to cooperate with the valve port sealing portion 2111 to close the valve port 211.
  • the sleeve 12 includes a peripheral wall portion 122 on its outer periphery and a matching portion 121 integrally formed with the peripheral wall portion 122.
  • the peripheral wall portion 122 and the matching portion 121 can also be fixedly connected by welding, clamping, etc., and the inner diameter of the peripheral wall portion 122 It is larger than the inner diameter of the mating part 121.
  • the valve needle 11 and the valve needle sleeve 12 form a receiving cavity A after being fixedly connected. Therefore, the valve needle 11 and the valve needle sleeve 12 define the receiving cavity A.
  • the gasket portion 13 provided in this embodiment can be a combination of an open retaining ring and a gasket, that is, in this embodiment, the gasket portion 13 includes both an open retaining ring and a gasket.
  • this embodiment The opening retaining ring of the washer portion 13 in the figure is not limited to the C-shaped opening retaining ring shown in the figure, but can also be replaced by other shapes of opening retaining rings; similarly, the gasket in this embodiment is not limited to the one shown in the figure.
  • the ring-shaped washer can also be replaced by other retaining rings that can play the same role, for example, an open retaining ring can also be used instead.
  • the rotational friction mating surfaces are mainly on the upper and lower surfaces of the opening retaining ring, or on the upper and lower surfaces of the washer
  • a coating with lubricating and wear-resistant functions on its surface for example, a coating containing polytetrafluoroethylene, or containing graphite, or containing molybdenum disulfide). Layer
  • the screw assembly 15 includes a lower stop portion 153, and the lower stop portion 153 abuts against the washer portion 13.
  • the screw rod 151 includes a lower spring groove portion 1511, and the lower spring groove portion 1511 extends along The surface of the screw rod 151 is formed by being recessed. At this time, the screw rod assembly 15 forms a lower flange portion 1531.
  • the lower stop portion 153 is a lower flange portion 1531.
  • a washer portion 13 is provided in the lower spring groove portion 151. At this time, the washer portion 13 is connected with the lower spring groove portion 152 in a limit position.
  • the lower flange portion 1531 can also be formed in different ways.
  • the screw rod 151 does not include the lower spring groove portion 1511, and the lower flange portion 1531 may be formed by extending the lower end of the screw rod 151 in the circumferential direction along its surface. At this time, the lower flange portion 1531 can still abut the gasket portion 13.
  • the screw assembly 15 further includes an upper stop portion 155, which abuts against the spring 14.
  • the screw assembly 15 includes an upper flange portion 1551, which extends along the The surface of the screw rod 151 extends in the circumferential direction.
  • the upper flange portion 1551 and the screw rod 151 can be integrally formed or fixedly connected by welding or the like.
  • the upper stop portion 155 is the upper flange portion 1551.
  • the spring 14 is also sheathed on the screw rod 151. Specifically, one end of the spring 14 abuts against the upper flange 1551, and the other end of the spring 14 abuts against the washer part 13. Under the action of the spring 14, the washer part 13 and the lower flange Section 1531 offset. It is worth noting that one end of the spring 14 abuts the upper flange 1551, including one end of the spring 14 directly abuts the upper flange 1551, and also includes one end of the spring 14 indirectly abuts the upper flange 1551, for example, the spring 14 and The upper flange 1551 is directly provided with a retaining ring or other components.
  • the washer portion 13 Since the washer portion 13 is in positionally connected with the lower groove portion 152 of the spring, at this time, due to the influence of the spring 14 on the washer portion 13, the washer portion 13 abuts against the lower flange portion 1531.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • the screw valve needle assembly 1 provided in this embodiment further includes a valve needle support portion 154, and the valve needle support portion 154 abuts against the mating portion 121.
  • the screw rod assembly 15 includes a sleeve member 156.
  • the sleeve member 156 includes a hole portion 1561, a body portion 1562, and a suspension engaging portion 1563.
  • the hole portion 1561 may be a through hole or a blind hole.
  • One end of the screw rod 151 is connected to the hole portion 1561. The connection can be fixed by welding, interference fit, etc.
  • the suspension engaging portion 1563 extends along the circumferential direction of the body portion 1562. At this time, the outer diameter of the suspension engaging portion 1563 is larger than the outer diameter of the body portion 1562.
  • the valve needle support portion 154 is a suspension card At this time, the outer diameter of the suspension engaging portion 1563 is larger than the inner diameter of the mating portion 121.
  • the distance D1 between the suspension engaging portion 1563 and the first retaining ring 13 is greater than or equal to the distance D2 between the suspension engaging portion 1563 and the upper end of the mating portion 121.
  • the distance between D1-D2 can be between 0-0.03mm.
  • valve needle 11 can be hung on the suspension engaging portion 1563 through the valve needle sleeve 12. Since the valve needle 11 is hung on the suspension engaging portion 1563 through the valve needle sleeve 12, the valve needle 11 is not subjected to the elastic load generated by the spring 14. .
  • FIG. 3 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully open state.
  • the stroke of the valve needle 11 from the valve port 211 is L.
  • the spring 14 is in its initial compressed state, and the slidable washer portion 13 provided on the valve needle screw assembly 1 abuts against the upper surface of the lower flange portion 1531, The valve needle 11 is not subjected to the elastic load generated by the spring 11.
  • the valve needle 11 is suspended on the suspension engaging portion 1563 through the valve needle sleeve 12, and the lower surface of the gasket portion 13 abuts against the upper surface of the lower flange portion 1531. At this time, the lower surface of the gasket portion 13 and the upper surface of the mating portion 121 are still There is a certain amount of clearance D1-D2, so the valve needle is not subjected to the elastic load generated by the spring 14. At this time, the valve needle 11 is suspended and supported by the suspension engaging portion 1563 of the sleeve member 156.
  • the screw rod 151 will move along the axis, and the distance between the valve needle sealing portion 111 of the valve needle 11 and the valve port sealing portion 2111 of the valve port 211 will also change.
  • FIG. 4 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the valve needle and the valve port sealing part just contact, the electronic expansion valve is from the fully opened state to the valve needle sealing part 111 Just touching the valve port sealing part 2111, the displacement amount of the valve needle 11 moving down at this time is L.
  • the spring 11 is always in its initial compression state, and the lower stop part 153 provided on the screw rod 151 always abuts against the wire
  • the valve needle 11 is not subjected to the elastic load generated by the compression spring 11 in this state.
  • the lower surface of the first retaining ring 13 and the mating portion 121 of the valve needle sleeve 12 The upper surface still maintains a certain amount of gap D1-D2.
  • Fig. 5 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the spring has not been further compressed at the critical point.
  • the screw rod 151 in FIG. 5 continues to move downward by the displacement of D1-D2.
  • the lower surface of the gasket portion 13 and the upper end of the mating portion 121 of the valve needle sleeve 12 are just in contact.
  • the critical point at this time corresponds to the critical point where the spring 14 is to be further compressed, and it also corresponds to the critical point where the valve needle 11 and the valve needle sleeve 12 are to bear the elastic load of the compression spring 12 that is further compressed.
  • FIG. 6 is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state. Compared with the state in Fig. 5, the screw rod 151 in Fig. 6 has moved downward by the displacement amount of ⁇ .
  • FIG. 9 is a partial cross-sectional view of the second embodiment of the electronic expansion valve provided by the present invention when it is fully opened;
  • the screw assembly 15 includes a lower stop portion 153, which can abut against the washer portion 13.
  • the screw assembly 15 includes a sleeve member 156, and the sleeve member 156 includes a connecting hole.
  • the connecting hole portion 1561 can be a through hole or a blind hole.
  • One end of the screw rod 151 and the connecting hole portion 1561 can be welded, interference fit, etc. Fixed connection.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • the suspension engaging portion 1563 extends along the circumferential direction of the body portion 1562. At this time, the outer diameter of the suspension engaging portion 1563 is larger than the outer diameter of the body portion 1562.
  • the valve needle support portion 154 is a suspension card The engagement portion 1563. At this time, the outer diameter of the suspension engagement portion 1563 is larger than the inner diameter of the mating portion 121. Therefore, the suspension engagement portion 1563 can abut against the engagement portion 121 of the valve needle sleeve 12.
  • the difference from the first embodiment is that in this embodiment, the lower stop portion 153 is no longer the lower flange portion 1531. At this time, the lower stop portion 153 is the body portion 1562 of the sleeve member 156, that is, in this embodiment In the example, the body portion 1562 and the washer portion 13 can abut against each other.
  • the “capable” mentioned in the present invention refers to the electronic expansion valve in a specific state, and does not mean that the electronic expansion valve is in all working states.
  • the body portion 1562 can be opposed to the gasket portion 13 , Means that the valve port 211 is fully opened, etc.
  • the distance between D1-D2 can be between 0-0.03mm.
  • FIG. 10 is a partial cross-sectional view of the third embodiment of the electronic expansion valve provided by the present invention in a fully open state.
  • the screw assembly 15 includes a valve needle support portion 154.
  • the upper surface of the valve needle support portion 154 can abut against the mating portion 121 of the valve needle sleeve 12.
  • the screw assembly 15 includes a valve needle support washer 1541.
  • a valve needle support groove portion 1512 and a valve needle support flange portion 1513 are also provided on the screw rod 151.
  • valve needle support groove portion 1512 is recessed along the surface of the screw rod 151, and thus is located in the valve needle support recess
  • the valve needle support flange portion 1513 below the groove portion 1512 protrudes relative to the circumference of the valve needle support groove portion 1512, the valve needle support washer 1541 is assembled in the valve needle support groove portion 1512, specifically, the valve needle support washer 1541 It is fixedly connected with the valve needle supporting groove portion 1512 or is connected with a limit position.
  • valve needle support flange portion 1513 can be used for the molding of the valve needle support flange portion 1513.
  • the screw rod 151 does not include the valve needle support groove portion 1512, and the valve needle support flange portion 1513 may be formed by the screw rod 151.
  • the lower end is formed along the circumferential direction of the surface. At this time, the valve needle support flange 1513 can still abut against the valve needle support washer 1541.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • valve needle support portion 154 is a valve needle support washer 1541, and the upper surface of the valve needle support washer 1541 can abut against the mating portion 121 of the valve needle sleeve 12.
  • valve needle 11 can pass and The fixedly connected valve needle sleeve 12 is supported by the valve needle support washer 154.
  • valve needle support portion 154 is no longer a suspension engagement portion 1563, and the valve needle support portion 154 is a valve needle support washer 154, that is, in this embodiment, the mating portion 121 and The valve pin support washer 1541 can be offset.
  • the “capable” mentioned in the present invention refers to the electronic expansion valve in a specific state, and does not mean that the electronic expansion valve is in all states.
  • the mating portion 121 and the valve needle support washer 1541 can Offset means that the valve port 211 is fully opened, etc.
  • the surface of the valve needle support washer 1541 can be sprayed or plated with a coating with lubricating and wear-resistant functions (for example, containing polytetrafluoroethylene, or containing graphite, Or a coating containing molybdenum disulfide), thereby increasing the service life of the electronic expansion valve.
  • a coating with lubricating and wear-resistant functions for example, containing polytetrafluoroethylene, or containing graphite, Or a coating containing molybdenum disulfide
  • FIG. 11 is a partial cross-sectional view of the fourth embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • the screw assembly 15 includes an upper stopper 155, and the upper stopper 155 abuts against the spring 14.
  • the screw assembly 15 is equipped with an upper stop ring 1552.
  • the screw rod 151 is also provided with an upper spring ring groove 1514, the upper ring groove 1514 of the spring is recessed along the surface of the screw rod 151, and the upper retaining ring 1552 is assembled in the upper ring groove of the spring and the upper ring groove 1514 of the spring.
  • the retaining ring 1552 is fixedly connected or connected with the annular groove 1514 on the spring, that is, it is locked into the annular groove 1514 on the spring to limit the position.
  • the upper flange portion 1551 and the upper retaining ring 1552 may also be provided at the same time, the spring 14 directly abuts the upper retaining ring 1552, and the spring 14 and the upper flange portion 1551 indirectly abut.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • the upper stop portion 155 is no longer an upper flange portion 1551, and the upper stop portion 155 is an upper stop ring 1552, that is, in this embodiment, the upper stop ring 1552 is The spring 14 opposes.
  • the spring 14 is sleeved on the shaft of the screw rod 151, and the upper end of the spring 14 abuts against the lower end surface of the upper retaining ring 1552.
  • the present invention does not limit the number of retaining rings in the upper retaining ring 1552.
  • the upper retaining ring 1552 provided on the upper ring groove 1514 of the spring of the screw rod 151 can be composed of an open retaining ring, It is also possible to add one or more retaining rings on the lower side of the open retaining ring to form a superposition.
  • the distance between the suspension engaging portion 1563 and the lower flange portion 1531 is D1
  • the distance between the suspension engaging portion 1563 and the upper end of the mating portion 121 is D2, which still satisfies D1 ⁇ D2.
  • the rotating friction surface may also occur between the upper end of the spring 14 and the upper retaining ring 1552.
  • FIG. 12 is a partial cross-sectional view of the fifth embodiment of the electronic expansion valve provided by the present invention in a fully open state;
  • the number of washer portions 13 is one. This embodiment illustrates that the number of washers in the washer portion 13 is not limited in the present invention.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • the distance between the suspension engaging portion 1563 and the washer portion 13 is D1
  • the distance between the suspension engaging portion 1563 and the upper end of the mating portion 121 is D2, which still satisfies D1 ⁇ D2.
  • FIG. 13 is a partial cross-sectional view of the sixth embodiment of the electronic expansion valve provided by the present invention when it is fully opened;
  • a sleeve washer 157 is added between the sleeve part 156 and the valve needle sleeve 22.
  • valve needle support portion 154 is a sleeve washer 157, and the upper surface of the sleeve washer 157 and the lower surface of the mating portion 121 of the valve needle sleeve 12 can abut.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • the upper end of the suspension engaging portion 1542 can abut against the mating portion 121 of the valve needle sleeve 12, and it is not limited to the direct abutment between the two, but also includes the indirect abutment between the two.
  • the distance between the sleeve washer 157 and the washer portion 13 is D1
  • the distance between the sleeve washer 157 and the upper end of the mating portion 121 is D2, which still satisfies D1 ⁇ D2.
  • a coating with lubricating and wear-resistant functions on the surface of the sleeve gasket 157 for example, containing polytetrafluoroethylene.
  • Ethylene, or coating containing graphite or molybdenum disulfide composition thereby increasing the service life of the electronic expansion valve.
  • FIG. 14 is a partial cross-sectional view of the seventh embodiment of the electronic expansion valve provided by the present invention when it is fully opened;
  • the purpose of the present invention is mainly to improve the screw valve needle assembly 1 of the electronic expansion valve.
  • the electronic expansion valve such as magnetic rotor assembly, screw valve needle assembly, nut assembly, stop device, etc.
  • the components can all adopt general technology, or other electronic expansion valve structures that can achieve the same function.
  • valve seat assembly 2 the structure of the valve seat assembly 2 is slightly different.
  • the valve seat assembly is assembled and fixedly connected by the valve seat 21, the first connecting portion 22, the second connecting portion 23, and the guide seat 24.
  • the nut component 30 in this embodiment is fixedly connected to the upper side of the valve seat assembly 2 (specifically connected to the upper side of the valve seat 21) through the nut connecting body 32, and the fixed connection method can preferably be a welding fixed connection method. .
  • the guide seat 24 cooperates with the valve needle screw assembly 1, and the guide seat 24 has a guiding function for the valve needle screw assembly 1.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 cooperates with the screw assembly 15 to relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • Figure 15 is a partial cross-sectional view of the eighth embodiment of the electronic expansion valve provided by the present invention in a fully open state
  • valve seat assembly 2 is assembled and fixedly connected by the valve seat 21, the first connecting portion 12 and the second connecting portion 13.
  • the center inner hole of the valve seat 21 of the valve seat assembly 2 is provided with an inner hole guide 212 that matches the valve pin screw assembly 1.
  • the inner hole guide 212 of the valve seat 21 is The valve needle screw assembly 1 provides a guiding function.
  • the inner hole guide portion 212 of the valve seat 21 cooperates with the outer edge of the valve needle 11 and/or the peripheral wall portion 122 of the valve needle sleeve 12 to form a valve needle screw assembly 1 Provide guidance.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • FIG. 16 is a partial cross-sectional view of the ninth embodiment of the electronic expansion valve provided by the present invention when it is fully opened;
  • the valve seat assembly 2 is assembled and fixedly connected by a valve seat 21, a first connecting portion 22, a second connecting portion 23, and a connecting seat 25.
  • the first connecting portion 12 is fixedly connected to the connecting seat 17, and the second The connecting portion 13 is fixedly connected to the valve seat 16.
  • the inner hole guide portion 212 in this embodiment is provided on the inner hole wall on the upper side of the valve port 211 of the valve seat 21.
  • the inner hole guide portion 212 of the valve seat assembly 2 provides a guide for the valve needle screw assembly 1 effect.
  • the valve needle screw assembly 1 cooperates with the inner hole guide portion 10b of the valve seat member to realize the guiding and guiding function of the valve needle portion.
  • the inner hole guide portion 212 of the valve seat 21 cooperates with the outer edge of the valve needle 11 and/or the peripheral wall portion 122 of the valve needle sleeve 12 to provide a guide for the valve needle screw assembly 1.
  • the spring 14 is sheathed on the screw rod 151, and the upper end of the spring 14 abuts the upper stop portion 155, and the lower end of the spring 14 abuts the lower stop portion 153. 14 and the screw assembly 15 can relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.
  • orientation nouns such as up, down, left, and right mentioned in this embodiment are all introduced based on the drawings in the specification for ease of description; and "first” and “in the names of components” Ordinal numbers such as “second” are also introduced for ease of description, and do not imply any restriction on any order of components.

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Abstract

一种电子膨胀阀，包括阀针丝杆组件(1)，所述阀针丝杆组件(1)包括垫圈部(13)、弹簧(14)以及丝杆组件(15)，所述丝杆组件(15)包括丝杆(151)，所述弹簧(14)外套于所述丝杆(151)；所述丝杆组件(15)包括下止挡部(153)以及上挡止部(155)，所述下止挡部(153)包括下凸缘部(1531)或本体部(1562)，所述下止挡部(153)或所述本体部(1562)能够与所述垫圈部(13)相抵。所述上挡止部(155)包括上凸缘部(1551)和/或上挡圈(1552)，所述上凸缘部(1551)和/或所述上挡圈(1552)与所述弹簧(14)相抵；所述弹簧(14)的下端与所述垫圈部(13)相抵。该电子膨胀阀，弹簧(14)外套于丝杆(151)，且弹簧(14)的上端与所述上挡止部(155)相抵，所述弹簧(14)的下端与所述下止挡部(153)相抵，弹簧(14)与该丝杆组件(15)配合，该阀针丝杆组件(1)的弹簧(14)不易偏斜。

Description

一种电子膨胀阀
本申请要求于2019年06月28日提交中国专利局、申请号为201910575526.5、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】
本发明涉及制冷控制技术领域，特别涉及一种电子膨胀阀。
【背景技术】
图1示出了一种典型的电子膨胀阀的阀针组件结构，该电子膨胀阀的阀针组件具有丝杆16'，丝杆16'与阀针5'通过套筒25'实现浮动连接；阀针5'与所述25'之间设置有第二垫片27'。套筒25'内装有压缩弹簧8'，压缩弹簧8'的上端抵靠在丝杆16'下端的衬套上，弹簧8'的下端面抵靠在轴承24'上。
本领域技术人员可以提供另一种阀针丝杆组件，该阀针丝杆组件的弹簧不易偏斜。
【发明内容】
本发明的目的在于提供一种电子膨胀阀，该阀针丝杆组件的弹簧不易偏斜。
为实现上述目的，采用如下技术方案：一种电子膨胀阀，其特征在于，包括阀针丝杆组件，所述阀针丝杆组件包括垫圈部、弹簧以及丝杆组件，所述丝杆组件包括丝杆，所述弹簧外套于所述丝杆；
所述丝杆组件包括下止挡部以及上挡止部，所述下止挡部包括下凸缘部或本体部，所述下止挡部或所述本体部能够与所述垫圈部相抵。
所述上挡止部包括上凸缘部和/或上挡圈，所述上凸缘部和/或所述上挡圈与所述弹簧相抵；
所述弹簧的下端与所述垫圈部相抵。
本发明提供的电子膨胀阀，弹簧外套于丝杆，且弹簧的上端与所述上挡止部相抵，所述弹簧的下端与所述下止挡部相抵，弹簧与该丝杆组件配合，该阀针丝杆组件的弹簧不易偏斜。
【附图说明】
图1为一种典型的电子膨胀阀的阀针组件结构；
图2为本发明提供的电子膨胀阀第一实施例全闭状态时的剖视图；
图3为本发明提供的电子膨胀阀第一实施例全开状态时的局部剖视图；
图4为本发明提供的电子膨胀阀第一实施例阀针与阀口密封部刚接触时的局部剖视图；
图5为本发明提供的电子膨胀阀第一实施例弹簧还没有被进一步压缩的临界点时的局部剖视图；
图6为本发明提供的电子膨胀阀第一实施例全闭状态时的局部剖视图；
图7为图2中阀针丝杆组件的剖视图；
图8为图7中阀针丝杆组件的爆炸图；
图9为本发明提供的电子膨胀阀第二实施例全开状态时的局部剖视图；
图10为本发明提供的电子膨胀阀第三实施例全开状态时的局部剖视图；
图11为本发明提供的电子膨胀阀第四实施例全开状态时的局部剖视图；
图12为发明提供的电子膨胀阀第第五实施例全开状态时的局部剖视图；
图13为发明提供的电子膨胀阀第第六实施例全开状态时的局部剖视图；
图14为发明提供的电子膨胀阀第第七实施例全开状态时的局部剖视 图；
图15为发明提供的电子膨胀阀第第八实施例全开状态时的局部剖视图；
图16为发明提供的电子膨胀阀第第九实施例全开状态时的局部剖视图；
其中，上述附图包括以下附图标记：
1、阀针丝杆组件；11、阀针；111、阀针密封部；12、阀针套；121、配合部；122、周壁部；13、垫圈部；14、弹簧；15、丝杆组件；151、丝杆；1511、弹簧下凹槽部；1512、阀针支撑凹槽部；1513、阀针支撑凸缘部；1514、弹簧上环形凹槽弹簧上环形凹槽；153、下止挡部；1531、下凸缘部；154、阀针支撑部；1541、阀针支撑垫圈；155、上挡止部；1551、上凸缘部；1552、上挡圈；156、轴套部件；1561、结构孔部；1562、本体部；1563、悬吊卡合部；20、阀体；2、阀座组件；21、阀座；211、阀口；2111、阀口密封部；212、内控导向部；22、第一接管部部；23、第二接管部部；24、导向座；241、内孔导向部；25、连接座；3、螺母组件；31、螺母；32、螺母连接部；33、滑动环；4、转子组件；41、转子磁体；42、转子连接部；43、转子止动部；5、外壳；30、定子线圈；
【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。
请参考图2至图8，其中，图2为本发明提供的电子膨胀阀第一实施例全闭状态时的剖视图，图3为本发明提供的电子膨胀阀第一实施例全开状态时的局部剖视图，图4为本发明提供的电子膨胀阀第一实施例阀针与阀口密封部刚接触时的局部剖视图，图5为本发明提供的电子膨胀阀第一实施例弹簧还没有被进一步压缩的临界点时的局部剖视图，图6为本发明提供的电子膨胀阀第一实施例全闭状态时的局部剖视图，图7为图2中阀针丝杆组件的剖视图，图8为图7中阀针丝杆组件的爆炸图。
请具体参考图2，图2为本发明提供的电子膨胀阀第一实施例全闭状 态时的剖视图，在一种具体实施例中，本发明提供的电子膨胀阀由阀体20和定子线圈30构成。阀体20包括阀针丝杆组件1、阀座组件2、螺母组件3、转子组件4和外壳5。电子膨胀阀的定子线圈30连接驱动控制器，驱动控制器通电后，向定子线圈30发出脉冲驱动信号，定子线圈30产生周期性变化的磁场，从而驱动电子膨胀阀的转子组件4进行正向或反向旋转，转子组件4与阀针丝杆组件1的丝杆151固定连接，转子组件4在旋转时会同步带动丝杆151进行旋转。阀针丝杆组件1的丝杆151上设有外螺纹，螺母组件3的螺母31的内孔部位设有内螺纹，丝杆151与螺母31为螺纹配合，转子组件4旋转运动的同时，丝杆151会沿轴方向发生位移运动，从而可带动阀针丝杆组件1实现阀口211的开闭动作。
本实施例提供的阀座组件2，包括阀座21、第一接管部22、第二接管部23、导向座24和连接座25，第一接管部22、第二接管部23、导向座24和连接座25与阀座21固定组装。第一接管部22和第二接管部23作为电子膨胀阀流体介质的流入或流出通道，一般用于其安装在空调等制冷、制热系统中时与系统管路连接。阀座21在第二接管部23靠近中心的位置，设置有阀口211，阀口211的上侧边缘设有阀口密封部2111。
阀座组件1的导向座24的中心内孔位置，设有与阀针丝杆组件的外壁相配合的内孔导向部241，电子膨胀阀进行开闭动作时，内孔导向部241为阀针丝杆组件提供引导导正作用。
阀座组件2的上侧，同轴心设置有螺母组件3，螺母组件3包括螺母31、螺母连接体32、滑动环33和螺旋导轨34。螺母31可以通过螺母连接体32与阀座组件3采用焊接等方式固定连接。螺母31靠上侧的外圆上，设置有滑动环33和螺旋导轨34，滑动环33可沿螺旋导轨34在上、下限定的行程范围内螺旋转动，上述滑动环33和螺旋导轨34与转子组件4配合，用于实现电子膨胀阀从全开与全闭之间的行程控制。
转子组件4包括转子磁体41、转子连接部42、转子止动部43(转子止动部43与转子磁体41可以一体成型，本实施中采用分体组装的方式)。转子组件4可以通过转子连接体部42与阀针丝杆组件1的丝杆151固定连接(比如可采用焊接连接)，转子组件4在定子线圈60的驱动下，带动丝 杆151同步转动。转子组件4内侧设置有转子止动部43，转子止动部43与螺母31上的滑动环33和螺旋导轨34配合，用于限制转子组件4在规定的行程范围内转动。
另外，本实施例提供的电子膨胀阀还包括一端开口的外壳5，套装在转子组件4的外部，外壳5的开口与阀座组件2的上侧的连接座25焊接密封，构成一个密闭的容纳腔。
阀针丝杆组件1主要包括阀针11、阀针套12、垫圈部13、弹簧14以及丝杆组件15，具体的，请参考图7和图8，图7为阀针丝杆组件的剖视图；图8为阀针丝杆组件的爆炸图；
其中，阀针11与阀针套12可以通过焊接等方式固定连接，阀针11的一端包括阀针密封部111，用于与阀口密封部2111相配合以实现阀口211的关闭，阀针套12包括位于其外周的周壁部122以及与周壁部122一体成型的配合部121，当然，周壁部122与配合部121也可以采用焊接、卡接等方式固定连接，并且，周壁部122的内径大于配合部121的内径。阀针11与阀针套12固定连接后形成一个容纳腔A，因此，阀针11与阀针套12限定容纳腔A。
本实施例提供的垫圈部13可以采用开口挡圈和垫圈组合的方式，即在本实施例中，垫圈部13同时包括开口挡圈与垫圈，当然，从本发明的功能原理出发，本实施例中的垫圈部13的开口挡圈并不仅限于图示中的C形开口挡圈，也可以采用其它形状的开口挡圈替代；同理，本实施例中的垫圈，也不限于图示中的圆环形垫圈，也可采用能起到同样作用的其它挡圈替代，例如也可采用开口挡圈替代。
本实施方式中，当与阀针11固定连接的阀针套12与丝杆151发生相对旋转时，其旋转摩擦配合面主要在开口挡圈的上、下表面，或者在垫圈的上、下表面，为了进一步减小其相对旋转的摩擦阻力，优选的可以在其表面喷涂或镀覆具有润滑耐磨功能的涂层(例如含有聚四氟乙烯，或者含有石墨，或者含有二硫化钼成分的涂层)，从而提高电子膨胀阀的使用寿命。
该丝杆组件15包括下止挡部153，下止挡部153与垫圈部13相抵，具体的，在本实施例中，丝杆151包括弹簧下凹槽部1511，弹簧下凹槽部 1511沿丝杆151的表面凹陷而形成，此时，丝杆组件15形成下凸缘部1531，在本实施例中，下止挡部153为下凸缘部1531。
在弹簧下凹槽部151，设有垫圈部13，此时，垫圈部13与弹簧下凹槽部152限位连接。
值得注意的是，下凸缘部1531也可以采用不同的成型方式，例如，丝杆151不包括弹簧下凹槽部1511，下凸缘部1531可以由丝杆151下端沿其表面周向延伸形成，此时，下凸缘部1531任然可以与垫圈部13相抵。
此外，丝杆组件15还包括上挡止部155，上挡止部155与弹簧14相抵，具体的，在本实施例中，丝杆组件15包括上凸缘部1551，上凸缘部1551沿丝杆151的表面周向延伸，上凸缘部1551与丝杆151可以采用一体成型的方式，也可以通过焊接等方式固定连接，在本实施例中，上挡止部155为上凸缘部1551。
此外，弹簧14还外套于丝杆151，具体的，弹簧14的一端与上凸缘部1551相抵，弹簧14另一端与垫圈部13相抵，在弹簧14的作用下，垫圈部13与下凸缘部1531相抵。值得说明的是，弹簧14的一端与上凸缘部1551相抵，包括弹簧14的一端与上凸缘部1551直接相抵，也包括弹簧14的一端与上凸缘部1551间接相抵，例如弹簧14与上凸缘部1551直接设置有挡圈或者其他部件。
由于垫圈部13与弹簧下凹槽部152限位连接，此时，由于弹簧14对垫圈部13的影响，垫圈部13与下凸缘部1531相抵。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
此外，本实施例提供的丝杆阀针组件1，还包括阀针支撑部154，阀针支撑部154与配合部121相抵，具体的，在本实施例中，丝杆组件15包括轴套部件156，轴套部件156包括接孔部1561、本体部1562以及悬吊卡合部1563，该接孔部1561可以为通孔，也可以为盲孔，丝杆151的一端与该接孔部1561可以通过焊接、过盈配合等方式固定连接。
悬吊卡合部1563沿本体部1562的周向延伸，此时，悬吊卡合部1563的外径大于本体部1562的外径，在本实施例中，阀针支撑部154为悬吊卡合部1563，此时，悬吊卡合部1563的外径大于配合部121的内径。
此外，在阀口完全打开等情况下，悬吊卡合部1563与第一挡圈13之间的距离D1大于或者等于悬吊卡合部1563与配合部121上端的距离D2。
D1-D2的距离可以位于0-0.03mm之间。
此时，阀针11可以通过阀针套12悬挂于悬吊卡合部1563，由于阀针11通过阀针套12悬挂于悬吊卡合部1563，阀针11不受到弹簧14产生的弹力载荷。
请具体参考图3，图3为本发明提供的电子膨胀阀第一实施例全开状态时的局部剖视图，电子膨胀阀处于全开状态时，阀针11距离阀口211的行程为L，此时阀针丝杆组件1处于其行程的最上端，弹簧14处于其初始压缩状态，设置在阀针丝杆组件1上的可滑移的垫圈部13抵靠在下凸缘部1531的上表面，阀针11不受到弹簧11产生的弹力载荷。阀针11通过阀针套12悬挂于悬吊卡合部1563，垫圈部13的下表面抵靠在下凸缘部1531的上表面，此时垫圈部13的下表面与配合部121的上表面还有一定量的间隙D1-D2，因此阀针不受到所述弹簧14产生的弹力载荷，此时，阀针11被轴套部件156的悬吊卡合部1563悬吊支撑。
此外，随着转子组件4的转动，丝杆151会沿轴方向发生位移运动，阀针11的阀针密封部111相对于阀口211阀口密封部2111的距离也会发生变化。
请具体参考图4，图4为本发明提供的电子膨胀阀第一实施例阀针与阀口密封部刚接触时的局部剖视图，此时电子膨胀阀从全开状态，到阀针密封部111刚好接触阀口密封部2111，此时阀针11下移的位移量为L，此过程中弹簧11始终处于其初始压缩状态，设置在丝杆151上的下止挡部153始终抵靠在丝杆组件15的下凸缘部1531上，阀针11在此状态下也不受到所述压缩弹簧11产生的弹力载荷，此时第一挡圈13的下表面与阀针套12的配合部121的上表面仍然保持着一定量的间隙D1-D2。
请具体参考图5，图5为本发明提供的电子膨胀阀第一实施例弹簧还 没有被进一步压缩的临界点时的局部剖视图。与图4中的状态相比，图5中的丝杆151继续下移了D1-D2的位移量，此时垫圈部13的下表面与阀针套12的配合部121的上端刚好处于接触的临界点，此时相当于弹簧14处于要被进一步压缩的临界点，也相当于阀针11和阀针套12处于要承受被进一步压缩的压缩弹簧12的弹力载荷的临界点。
请具体参考图6，图6为本发明提供的电子膨胀阀第一实施例全闭状态时的局部剖视图。与图5中的状态相比，图6中的丝杆151下移了α的位移量，此时挡圈部13的下表面与阀针套12的配合部121已经抵紧，并且弹簧14被进一步压缩，阀针丝杆组件1的阀针密封部111与所述阀座部件2的阀口密封部2111抵触压紧，设置在丝杆151上的垫圈部13抵靠在阀针套12的配合部121的上表面，阀针11被进一步压缩的弹簧11产生的弹力所载荷。此时，电子膨胀阀处于全闭状态，丝杆151处于其行程的最下端位置，从全开状态到全闭状态丝杆151向下的行程为L+α。
请具体参考图9，图9为本发明提供的电子膨胀阀第二实施例全开状态时的局部剖视图；
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第二实施例，以下针对与第一实施例不同之处加以详细描述。
在本实施例中，该丝杆组件15包括下止挡部153，下止挡部153能够与垫圈部13相抵，具体的，丝杆组件15包括轴套部件156，轴套部件156包括接孔部1561、本体部1562以及悬吊卡合部1563，该接孔部1561可以为通孔，也可以为盲孔，丝杆151的一端与该接孔部1561可以通过焊接、过盈配合等方式固定连接。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
悬吊卡合部1563沿本体部1562的周向延伸，此时，悬吊卡合部1563的外径大于本体部1562的外径，在本实施例中，阀针支撑部154为悬吊卡 合部1563，此时，悬吊卡合部1563的外径大于配合部121的内径，因此，悬吊卡合部1563能够与阀针套12的配合部121相抵。
此外，与第一实施例不同的是，本实施例中下止挡部153不再为下凸缘部1531，此时，下止挡部153为轴套部件156的本体部1562，即本实施例中，本体部1562与垫圈部13能够相抵。
值得说明的是，本发明所述的“能够”是指在特定状态下，而并非指该电子膨胀阀在所有工作状态下，例如，在本实施例中，本体部1562能够与垫圈部13相抵，是指阀口211在完全打开等情况下。
当然，此时悬吊卡合部1563与第一挡圈13之间的距离D1与悬吊卡合部1563与配合部121上端的距离D2仍然满足D1≥D2。
D1-D2的距离可以位于0-0.03mm之间。
请具体参考图10，图10为本发明提供的电子膨胀阀第三实施例全开状态时的局部剖视图。
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第三实施例，以下针对与第一实施例不同之处加以详细描述。
在本实施例中，该丝杆组件15包括阀针支撑部154，阀针支撑部154的上表面能够与阀针套12的配合部121相抵，具体的，丝杆组件15包括阀针支撑垫圈1541，此外，在丝杆151上还设置有阀针支撑凹槽部1512以及阀针支撑凸缘部1513，阀针支撑凹槽部1512沿着丝杆151表面凹陷，于是，位于阀针支撑凹槽部1512下方的阀针支撑凸缘部1513相对于阀针支撑凹槽部1512的周向凸出，阀针支撑垫圈1541装配于阀针支撑凹槽部1512，具体的，阀针支撑垫圈1541与阀针支撑凹槽部1512固定连接或者限位连接。
值得注意的是，对于阀针支撑凸缘部1513的成型方式还可以采用其他的形式，例如，丝杆151不包括阀针支撑凹槽部1512，阀针支撑凸缘部1513可以由丝杆151下端沿其表面周向延伸形成，此时，阀针支撑凸缘部1513仍然可以与阀针支撑垫圈1541相抵。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14 的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
此时，阀针支撑部154为阀针支撑垫圈1541，阀针支撑垫圈1541的上表面能够与阀针套12的配合部121相抵，在阀口211打开等情况下，阀针11能够通过与之固定连接的阀针套12支撑于阀针支撑垫圈154。
与第一实施例不同的是，本实施例中阀针支撑部154不再为悬吊卡合部1563，阀针支撑部154为阀针支撑垫圈154，即本实施例中，配合部121与阀针支撑垫圈1541能够相抵。
值得说明的是，本发明所述的“能够”是指在特定状态下，而并非指该电子膨胀阀在所有状态下，例如，在本实施例中，配合部121与阀针支撑垫圈1541能够相抵，是指阀口211在完全打开等情况下。
当然，此时阀针支撑垫圈1541与第一挡圈13之间的距离D1，阀针支撑垫圈1541与配合部121上端的距离D2仍然满足D1≥D2。
为了进一步减小配合部121相对于丝杆151的旋转摩擦阻力，可以在阀针支撑垫圈1541的表面喷涂或镀覆具有润滑耐磨功能的涂层(例如含有聚四氟乙烯，或者含有石墨，或者含有二硫化钼成分的涂层)，从而提高电子膨胀阀的使用寿命。
请具体参考图11，图11为本发明提供的电子膨胀阀第四实施例全开状态时的局部剖视图；
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第四实施例，以下针对与第一实施例不同之处加以详细描述。
在本实施例中，丝杆组件15包括上挡止部155，上挡止部155与弹簧14相抵，具体的，在本实施例中，该丝杆组件15装配有上挡圈1552，另外，丝杆151上还设置有弹簧上环形凹槽1514，弹簧上环形凹槽1514沿着丝杆151表面凹陷，上挡圈1552装配于弹簧上环形凹槽弹簧上环形凹槽1514，具体的，上挡圈1552与弹簧上环形凹槽1514固定连接或者限位连接，即卡入弹簧上环形凹槽1514内以限位。也可以同时设置上凸缘部1551 和上挡圈1552，所述弹簧14与上挡圈1552直接相抵，弹簧14与上凸缘部1551间接相抵。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
与第一实施例不同的是，本实施例中上挡止部155不再为上凸缘部1551，上挡止部155为上挡圈1552，即在本实施例中，上挡圈1552与弹簧14相抵。
此时，弹簧14套装在丝杆151的轴上，弹簧14的上端部与上挡圈1552的下端面相抵。值得说明的是，本发明并不限定上挡圈1552中挡圈的数量，具体的，设置于丝杆151的弹簧上环形凹槽1514上的上挡圈1552，可以由一个开口挡圈构成，也可以在开口挡圈下侧再增加一个或者多个挡圈叠加构成。
当然，此时悬吊卡合部1563与下凸缘部1531之间的距离为D1,悬吊卡合部1563与配合部121上端的距离为D2,仍然满足D1≥D2。
在本实施例中，当阀针11与丝杆151发生相对旋转时，其旋转摩擦面也可能发生在弹簧14上端与上挡圈1552之间，为了进一步减小其相对旋转的摩擦阻力，可以在上述上挡圈1552表面喷涂或镀覆具有润滑耐磨功能的涂层(例如含有聚四氟乙烯，或者含有石墨，或者含有二硫化钼成分的涂层)，从而提高电子膨胀阀的使用寿命。
请具体参考图12，图12为发明提供的电子膨胀阀第第五实施例全开状态时的局部剖视图；
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第五实施例，以下针对与第一实施例不同之处加以详细描述。
与第一实施例不同的是，在本实施例中，垫圈部13的数量为1个，本实施例说明的是：在本发明中，并不限定垫圈部13中垫圈的数量。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14 的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
当然，此时悬吊卡合部1563与垫圈部13之间的距离为D1,悬吊卡合部1563与配合部121上端的距离为D2,仍然满足D1≥D2。
请具体参考图13，图13为发明提供的电子膨胀阀第第六实施例全开状态时的局部剖视图；
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第六实施例，以下针对与第一实施例不同之处加以详细描述。
在本实施例中，其在轴套部件156与阀针套22之间增加了轴套垫圈157。在阀针11不受到所述弹簧14产生的弹力载荷期间，阀针11与阀针套12间隔了轴套垫圈157悬吊在轴套部件156的悬吊卡合部1563上。
此时，阀针支撑部154为轴套垫圈157，轴套垫圈157的上表面与阀针套12的配合部121的下表面能够相抵。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
本实施例说明的是：在本发明中，悬吊卡合部1542的上端能够与阀针套12的配合部121相抵，并不是局限于两者直接相抵，还包括两者间接相抵。
当然，此时轴套垫圈157与垫圈部13之间的距离为D1,轴套垫圈157与配合部121上端的距离为D2,仍然满足D1≥D2。
为了进一步减小阀针套12的配合部121相对于丝杆151的旋转摩擦阻力，优选的可以在轴套垫圈157的表面喷涂或镀覆具有润滑耐磨功能的涂层(例如含有聚四氟乙烯，或者含有石墨，或者含有二硫化钼成分的涂层)，从而提高电子膨胀阀的使用寿命。
请具体参考图14，图14为发明提供的电子膨胀阀第第七实施例全开 状态时的局部剖视图；
需要指出的是，本发明目的主要是对电子膨胀阀的丝杆阀针组件1进行改进，对于电子膨胀阀的其他部件，如磁转子组件、丝杆阀针组件、螺母组件、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。
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第七实施例，以下针对与第一实施例不同之处加以详细描述。
例如在本实施例中，其阀座组件2的构造略有不同。阀座组件由阀座21、第一接管部22、第二接管部23、导向座24组装固定连接而成。本实施例中的螺母部件30通过螺母连接体32固定连接在阀座组件2的上侧(具体是连接在阀座21的上侧)，其固定连接的方式优选的可以采用焊接固定连接的方式。
在本实施例中，导向座24与阀针丝杆组件1相配合，导向座24对阀针丝杆组件1具有导向作用。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
见图15，图15为发明提供的电子膨胀阀第第八实施例全开状态时的局部剖视图；
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第八实施例，以下针对与第一实施例不同之处加以详细描述。
在本实施例中，阀座组件2由阀座21、第一接管部12、第二接管部13组装固定连接而成。阀座组件2的阀座21的中心内孔位置设有与阀针丝杆组件1相配合的内孔导向部212，电子膨胀阀进行开闭动作时，阀座21的内孔导向部212为阀针丝杆组件1提供引导导正作用，具体的，阀座21的内孔导向部212与阀针11的外缘和/或阀针套12的周壁部122配合， 为阀针丝杆组件1提供导向。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
请具体参考图16，图16为发明提供的电子膨胀阀第第九实施例全开状态时的局部剖视图；
为了便于描述本实施例，对于本实施例与第一实施例中具有相同结构且具有相同作用的部件采用同一附图标记，第一实施例中各部件的描述同样适用于第九实施例，以下针对与第一实施例不同之处加以详细描述。
在本实施例中，阀座组件2由阀座21、第一接管部22、第二接管部23、连接座25组装固定连接而成，第一接管部12与连接座17固定连接，第二接管部13与阀座16固定连接。本实施例中的内孔导向部212，设置于阀座21的阀口211上侧的内孔壁上，该阀座组件2的内孔导向部212为阀针丝杆组件1提供引导导正作用。电子膨胀阀进行开闭动作时，阀针丝杆组件1与阀座部件的内孔导向部10b配合，实现对阀针部的引导导正作用。具体的，阀座21的内孔导向部212与阀针11的外缘和/或阀针套12的周壁部122配合，为阀针丝杆组件1提供导向。
本实施例提供的电子膨胀阀，其弹簧14外套于丝杆151，且弹簧14的上端与所述上挡止部155相抵，所述弹簧14的下端与所述下止挡部153相抵，弹簧14与该丝杆组件15配合，可以相对降低弹簧14出现偏斜的情况，从而减少偏心磨损。
需要说明的是，本实施例所提及的上、下、左、右等方位名词，均是以说明书附图作为基准，为便于描述而引入的；以及部件名称中的“第一”、“第二”等序数词，也是为了便于描述而引入的，并不意味着对部件的任何次序作出任何的限定。
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 (12)

  1. 一种电子膨胀阀，其特征在于，包括阀针丝杆组件(1)，所述阀针丝杆组件(1)包括垫圈部(13)、弹簧(14)以及丝杆组件(15)，所述丝杆组件(15)包括丝杆(151)，所述弹簧(14)外套于所述丝杆(151)；
    所述丝杆组件(15)包括下止挡部(153)以及上止挡部(155)，所述下止挡部(153)能够与所述垫圈部(13)相抵；
    所述上挡止部(154)与所述弹簧(14)相抵；
    所述弹簧(14)的下端与所述垫圈部(13)相抵。
  2. 根据权利要求1所述的电子膨胀阀，其特征在于，所述阀针丝杆组件(1)还包括阀针(11)、阀针套(12)，所述阀针(11)与所述阀针套(12)固定连接，所述阀针套(12)包括周壁部(122)和配合部(121)，所述配合部(121)的内径小于所述周壁部(122)的内径，固定连接的所述阀针(11)、阀针套(12)与所述丝杆组件(15)限位连接。
  3. 根据权利要求1-2任一项所述的电子膨胀阀，其特征在于，所述下止挡部(153)包括下凸缘部(1531)，所述下凸缘部(1531)沿所述丝杆(151)的周向延伸，所述下止挡部(1531)与所述丝杆(151)一体成型或者固定连接，所述下止挡部(1531)能够与所述丝杆垫圈部(13)相抵。
  4. 根据权利要求1-2任一项所述的电子膨胀阀，其特征在于，所述丝杆组件(15)包括轴套部件(156)，所述轴套部件包括供所述丝杆(151)插入的接孔部(1561)、本体部(1562)以及悬吊卡合部(1563)，所述下止挡部(153)为所述本体部(1562)，所述本体部(1562)能够与所述垫圈部(13)相抵，所述悬吊卡合部(1563)沿所述本体部(1562)的周向延伸。
  5. 根据权利要求1-2任一项所述的电子膨胀阀，其特征在于，所述上挡止部(155)包括上凸缘部(1551)，所述上凸缘部(1551)沿所述丝杆(151)的周向延伸，所述上凸缘部(1551)与所述丝杆(151)一体成型或者固定连接，所述弹簧(14)与所述上凸缘部(1551)相抵。
  6. 根据权利要求1-2任一项所述的电子膨胀阀，其特征在于，所述上挡止部(155)包括上挡圈(1552)，所述丝杆(51)包括弹簧上环形凹槽 (1514)，所述弹簧上环形凹槽(1514)与所述上挡圈(1552)限位连接或者固定连接，所述弹簧(14)与所述上挡圈(1552)相抵。
  7. 根据权利要求1-2任一项所述的电子膨胀阀，其特征在于，所述上挡止部(155)包括上凸缘部(1551)和上挡圈(1552)，所述上凸缘部(1551)沿所述丝杆(151)的周向延伸，所述上凸缘部(1551)与所述丝杆(151)一体成型或者固定连接，所述上挡圈(1552)位于所述弹簧(14)和所述上凸缘部(1551)之间，所述弹簧(14)与所述上挡圈(1552)直接相抵，所述弹簧(14)与所述上凸缘部(1551)间接相抵。
  8. 根据权利要求3、5-7任一项所述的电子膨胀阀，其特征在于，所述丝杆组件(15)包括阀针支撑部(154)，所述阀针支撑部(154)包括阀针支撑垫圈(1541)以及阀针支撑凹槽部(1512)，所述阀针支撑垫圈(1541)与所述阀针支撑凹槽部(1512)固定连接或者限位连接，所述阀针支撑垫圈(1541)能够与所述阀针套(12)的配合部(121)相抵。
  9. 根据权利要求4所述的电子膨胀阀，其特征在于，所述丝杆组件(15)包括阀针支撑部(154)，所述阀针支撑部(154)包括悬吊卡合部(1563)，所述悬吊卡合部(1563)能够与所述阀针套(12)的配合部(121)相抵。
  10. 根据权利要求4所述的电子膨胀阀，其特征在于，所述丝杆组件(15)包括阀针支撑部(154)，所述阀针支撑部(154)包括轴套挡圈(157)，所述轴套垫圈(157)被所述悬吊卡合部(1563)支撑，所述轴套垫圈(157)能够与所述阀针套(12)的配合部(121)相抵。
  11. 根据权利要求2-10任一项所述的电子膨胀阀、其特征在于，所述下止挡部(153)与所述垫圈部(13)之间的距离为D1，所述下止挡部(153)与所述配合部(121)上端之间的距离为D2，且D1≥D2。
  12. 根据权利要求11所述的电子膨胀阀，其特征在于，0≤D1-D2≤0.03mm。
PCT/CN2020/098381 2019-06-28 2020-06-28 一种电子膨胀阀 Ceased WO2020259657A1 (zh)

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