CN115467981A - Electronic expansion valve - Google Patents

Electronic expansion valve Download PDF

Info

Publication number
CN115467981A
CN115467981A CN202110650625.2A CN202110650625A CN115467981A CN 115467981 A CN115467981 A CN 115467981A CN 202110650625 A CN202110650625 A CN 202110650625A CN 115467981 A CN115467981 A CN 115467981A
Authority
CN
China
Prior art keywords
valve core
valve
screw
assembly
screw rod
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.)
Pending
Application number
CN202110650625.2A
Other languages
Chinese (zh)
Inventor
不公告发明人
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 CN202110650625.2A priority Critical patent/CN115467981A/en
Publication of CN115467981A publication Critical patent/CN115467981A/en
Pending legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • F16K1/34—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
    • 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
    • F16K1/482—Attaching valve members to screw-spindles with a collar on the spindle or a groove in the spindle, by which a fixing element is supported, the spindle reaching into the valve member
    • F16K1/485—Attaching valve members to screw-spindles with a collar on the spindle or a groove in the spindle, by which a fixing element is supported, the spindle reaching into the valve member with a groove in the spindle
    • 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
    • F25B41/345—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by solenoids
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lift Valve (AREA)

Abstract

The utility model provides an electronic expansion valve, includes case lead screw subassembly, case lead screw subassembly includes case subassembly, packing ring portion, elastic component and lead screw part, and the case subassembly hangs in the lead screw part, and when lead screw supporting part and case supporting part offset, the case subassembly did not receive the spring load of elastic component, and the frictional force that the case subassembly received when the lead screw is rotatory is less.

Description

Electronic expansion valve
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of refrigeration control, in particular to an electronic expansion valve.
[ background of the invention ]
Fig. 10 shows a valve core assembly structure of a typical electronic expansion valve, the valve core assembly of the electronic expansion valve has a lead screw 16', and the lead screw 16' and the valve core 5 'are in limit connection through a sleeve 25'; a second gasket 27' is arranged between the valve cartridge 5' and the sleeve 25 '. The sleeve 25 'is internally provided with a spring 8', the upper end of the spring 8 'is abutted against a bush at the lower end of the screw rod 16', and the lower end surface of the elastic piece 8 'is abutted against a bearing 24'.
The spring load of the spring 8 'acts on the valve element 5' through the bearing 24 'and the steel ball 35'.
The electronic expansion valve using the valve core assembly has the advantages that the elastic load of the elastic part of the electronic expansion valve is always acted on the valve core, and the friction force borne by the valve core when the screw rod rotates is larger.
[ summary of the invention ]
The invention aims to provide an electronic expansion valve which comprises a valve core screw rod assembly, wherein the valve core screw rod assembly comprises a valve core assembly, a gasket part, an elastic part and a screw rod part;
the screw rod component comprises a screw rod body part, a stopping part, a limiting part and a screw rod supporting part, the elastic part is sleeved on the screw rod body part, the upper end part of the elastic part is abutted against the stopping part, the lower end part of the elastic part is abutted against the gasket part, the limiting part can be abutted against the gasket part, and the gasket part is in limit connection with the screw rod component;
the valve core assembly comprises a valve core supporting part and a valve core abutting part, the lower end of the screw rod component is positioned in the valve core assembly, the screw rod supporting part can abut against the valve core supporting part, and the valve core abutting part can abut against the gasket part;
the valve core assembly is connected with the screw rod component in a limiting way;
when the screw rod supporting part is abutted against the valve core supporting part, the valve core abutting part is not abutted against the gasket part.
When the screw supporting part is abutted to the valve core supporting part, the valve core assembly is not subjected to the elastic load of the elastic part, and the friction force of the valve core assembly when the screw rotates is small.
[ description of the drawings ]
Fig. 1 is a sectional view showing a fully closed state of an electronic expansion valve according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of the valve spool stem assembly of FIG. 1;
fig. 3 is a partial sectional view showing a fully opened state of the electronic expansion valve according to the first embodiment of the present invention;
FIG. 4 is a cross-sectional view of the valve cartridge screw assembly of FIG. 3;
fig. 5 is a partial cross-sectional view of the valve cartridge sealing portion of the electronic expansion valve of the first embodiment of the present invention just contacting the valve port sealing portion;
FIG. 6 is a cross-sectional view of the valve spool stem assembly of FIG. 5;
fig. 7 is a partial sectional view of the first embodiment of the present invention at a critical point where the compression spring member is not yet further compressed;
FIG. 8 is a cross-sectional view of the valve spool assembly of FIG. 7;
fig. 9 is a sectional view of a spool screw assembly of the electronic expansion valve of the second embodiment;
FIG. 10 is a valve cartridge assembly configuration for a typical electronic expansion valve;
wherein the figures include the following reference numerals:
1 spool screw assembly, 11 spool assembly, 11A spool case, 11B spool, 111 spool support portion, 112 peripheral wall portion, 113 spool abutment portion, 114 spool seal portion, 13 gasket portion, 14 elastic member, 15 screw member, 15A upper flange portion, 15B upper retainer ring, 151 screw body portion, 155 screw upper groove portion, 156 screw lower groove portion, 152 stopper portion, 153 restricting portion 154 screw support part, 2 valve seat assembly, 21 valve seat, 22 first pipe connecting part, 23 second pipe connecting part, 24 guide seat, 211 valve port part, 211A valve port sealing part, 3 nut assembly, 31 nut, 32 nut connecting body, 33 sliding ring, 34 spiral guide rail, 4 rotor assembly, 41 rotor magnet, 42 rotor connecting part, 43 sliding ring, 44 spiral guide rail, 5 shell
[ detailed description ] embodiments
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
First embodiment
Referring to fig. 1-8 in detail, fig. 1 is a cross-sectional view of an electronic expansion valve in a fully closed state according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view of the valve spool assembly of FIG. 1; fig. 3 is a partial sectional view showing a fully opened state of the electronic expansion valve according to the first embodiment of the present invention; FIG. 4 is a cross-sectional view of the valve cartridge screw assembly of FIG. 3;
fig. 5 is a partial cross-sectional view of the valve cartridge sealing portion of the electronic expansion valve of the first embodiment of the present invention just contacting the valve port sealing portion; FIG. 6 is a cross-sectional view of the valve spool stem assembly of FIG. 5; fig. 7 is a partial sectional view of the first embodiment of the present invention at a critical point where the compression spring member is not yet further compressed; FIG. 8 is a cross-sectional view of the valve spool assembly of FIG. 7;
referring to fig. 1, in an embodiment, the electronic expansion valve provided by the present invention includes a valve body and a stator coil (not shown), wherein the stator coil is sleeved on the valve body, and the valve body includes a valve core screw assembly 1, a valve seat assembly 2, a nut assembly 3, a rotor assembly 4 and a housing 5. A stator coil of the electronic expansion valve is connected with a driving controller, after the driving controller is electrified, a pulse driving signal is sent to the stator coil, and the stator coil generates a changing magnetic field, so that a rotor assembly 4 of the electronic expansion valve is driven to rotate in the forward direction or the reverse direction, the rotor assembly 4 is fixedly connected with a screw rod component 15 of the valve core screw rod assembly 1, and the rotor assembly 4 can synchronously drive the screw rod component 15 to rotate when rotating. The external thread is arranged on the screw rod part 15 of the valve core screw rod component 1, the internal thread is arranged on the inner hole part of the nut 31 of the nut component 3, the screw rod part 15 is in threaded fit with the nut 31, and when the rotor component 4 rotates, the screw rod part 15 can move along the axial direction, so that the valve core 11 can be driven to realize the opening and closing action of the valve opening part 211.
With continued reference to fig. 1, the present embodiment provides a valve seat assembly 2 including a valve seat 21, a first piping portion 22, a second piping portion 23, and a guide seat 24. The first pipe receiving portion 22, the second pipe receiving portion 23, and the guide seat 24 are fixedly assembled with the valve seat 21. The first pipe receiving portion 22 and the second pipe receiving portion 23 are used as an inflow or outflow passage for a fluid medium of an electronic expansion valve, and are generally used for connecting with a system pipeline when the electronic expansion valve is installed in a refrigeration and heating system such as an air conditioner, the guide seat 24 is provided with a valve port portion 211 at a position near the center of the second pipe receiving portion 23, and the valve port portion 211 is provided with a valve port sealing portion 211A (a portion forming a seal with the valve core assembly 11) which can be in sealing engagement with the valve core assembly 11 (mentioned below).
An inner hole guide portion 241 is disposed at a central inner hole position of the guide seat 24 of the valve seat assembly 2 and is matched with an outer wall (specifically, the peripheral wall portion 112, which will be mentioned later) of the plug screw assembly 1, and when the electronic expansion valve performs an opening and closing operation, the inner hole guide portion 241 can provide a guide and guide function for the plug screw assembly 1.
The nut component 3 is coaxially arranged with the valve seat component 2 in the valve body, and the nut component 3 comprises a nut 31, a nut connecting body 32, a sliding ring 33 and a spiral guide rail 34. The nut 31 is fixedly connected with the valve seat assembly 3 through a nut connector 32 by adopting welding, interference crimping and other modes. The outer edge of the upper side of the nut 31 is provided with a sliding ring 33 and a spiral guide rail 34, the sliding ring 33 can spirally rotate along the spiral guide rail 34 within a stroke range defined by the upper end and the lower end, and the sliding ring 33 and the spiral guide rail 34 are matched with the rotor assembly 4 for realizing stroke control of the electronic expansion valve between full opening and full closing.
The rotor assembly 4 includes a rotor magnet 41, a rotor connecting portion 42, and a rotor stopper portion 43 (the rotor stopper portion 43 and the rotor magnet 41 may be integrally formed, and a separate assembly method is adopted in this embodiment). The rotor assembly 4 can be fixedly connected (for example, a welding connection mode can be adopted) with the screw rod part 15 of the valve core screw rod assembly 1 through the rotor connecting body 4, and the rotor assembly 4 drives the screw rod part 15 to synchronously rotate under the driving of the stator coil. The rotor assembly 4 is provided with a rotor stopper 43 on the inner side, and the rotor stopper 43 is engaged with the slide ring 33 and the spiral guide rail 34 on the nut 31 to limit the rotor assembly 4 to rotate within a predetermined stroke range.
In addition, the electronic expansion valve provided by the embodiment further includes a housing 5 with an opening at one end, the housing 5 is sleeved outside the rotor assembly 4, and the opening of the housing 5 is welded and sealed with the valve seat 21 to form a closed accommodating cavity.
Referring to fig. 2 specifically, the spool screw assembly 1 mainly includes a spool assembly 11, a washer portion 13, an elastic element 14 and a screw member 15, the screw member 15 provided in this embodiment includes a screw body 151, a stopping portion 152, a limiting portion 153 and a screw supporting portion 154, in this embodiment, the elastic element 14 is a spring, the elastic element 14 is sleeved outside a peripheral wall of the screw body 151 and is located (limited) between the stopping portion 152 and the limiting portion 153, specifically, an upper end portion of the elastic element 14 abuts against the stopping portion 152, and a lower end portion abuts against the limiting portion 153, where the abutting of the elastic element 14 with XX described in this specification means that an elastic force generated by compression of the elastic element 14 can be transmitted to XX.
In addition, the valve core screw assembly 1 provided by the present embodiment further includes a washer portion 13, the washer portion 13 is substantially in a ring structure, and is disposed outside the peripheral wall of the screw body 151 and located between the elastic element 14 and the limiting portion 153, the washer portion 13 can abut against the limiting portion 153 and is supported by the limiting portion 153, that is, the elastic force generated by the elastic element 14 can be transmitted to the limiting portion 153 through the washer portion 13, and the washer portion 13 is limited by the limiting portion 153 and cannot be disengaged from the lower end of the screw member 15, so that the washer portion 13 is connected to the screw body 151 in a limited manner.
When the above-described structure including the screw member 15, the elastic member 14, and the washer portion 13 is not subjected to other external forces, the upper end portion of the elastic member 14 abuts against the stopper portion 152, the lower end portion abuts against the washer portion 13, the washer portion 13 abuts against the limiting portion 153, and the elastic force generated by the elastic member 14 is transmitted to the limiting portion 153 through the washer portion 13, and at this time, the elastic member 14 abuts against the limiting portion 153 (indirectly), but naturally, the elastic member 14 and the stopper portion 152 are not limited to directly abutting, and a member such as a washer may be provided between the two to indirectly abut against each other.
With reference to fig. 2, the valve core assembly 11 is generally a structure having an opening at an upper end, a hollow interior, and a closed lower portion, and includes a valve core support portion 111, a peripheral wall portion 112, a valve core abutting portion 113, and a valve core sealing portion 114, wherein a distance from the valve core support portion 111 to a central axis of the valve core assembly 11 is smaller than a distance from the peripheral wall portion 112 to the central axis of the valve core assembly 11, the valve core support portion 111 can abut against the lead screw support portion 154, so that the valve core assembly 11 can be supported on the lead screw member 15, the peripheral wall portion 112 is sleeved on the elastic member 14, the valve core abutting portion 113 is generally located below the gasket portion 13, and in some states, the valve core assembly 11 can abut against the gasket portion 13, and overcome an elastic force of the elastic member 14 to move the valve core assembly 11 upward relative to the lead screw member 15, and the valve core sealing portion 114 can abut against the valve port sealing portion 211A.
In this embodiment, the valve core assembly 11 includes a valve core sleeve 11A and a valve core 11B, the valve core sleeve 11A is a cylindrical structure with openings at two ends and a hollow interior, and the upper end of the valve core sleeve is provided with a valve core support portion 111, the valve core support portion 111 is a structure formed by extending inward along the inner edge of the peripheral wall portion 112 and is provided with a through hole, the screw rod member 15 penetrates through the through hole, and the valve core support portion 111 and the peripheral wall portion 112 are an integrally formed structure; the valve core abutting portion 113 of the valve core 11B extends into the lower end opening of the valve core sleeve 11A, the valve core 11B is fixedly connected with the valve core sleeve 11A, the cross section of the valve core abutting portion 113 is approximately circular, the upper end portion of the valve core abutting portion 113 can abut against the gasket portion 13, and the limiting portion 153 can extend into a space formed by the inner edge of the valve core abutting portion 113.
With continued reference to fig. 2, the valve core assembly 11 is connected to the screw rod component 15 in a limiting manner, specifically, the lower end portion of the screw rod component 15 is located inside the valve core assembly 11, and the upper end portion is located outside the valve core assembly 11. In the valve body assembly 11 having this configuration, the valve body support portion 111 can abut against the screw support portion 154 in a state where only gravity is applied, so that the valve body assembly 11 is supported by the screw member 15, and in the present embodiment, the outer peripheral shape of the screw support portion 154 is substantially circular, and the through hole shape of the valve body support portion 111 is also substantially circular, so that the diameter of the screw support portion 154 is larger than the diameter of the through hole of the valve body support portion 111.
In the present embodiment, the stopper 152 is substantially formed by a member extending in a circumferential direction away from the center of the lead screw body 151, and the member is the upper flange portion 15A, specifically, the stopper 152 is substantially an end surface of the upper flange portion 15A abutting against the elastic piece 14, the lead screw supporting portion 154 is an end surface of the upper flange portion 15A supporting the valve body assembly 11, and the stopper 152 and the lead screw supporting portion 154 are formed in the same member (the upper flange portion 15A), and of course, the upper flange portion 15A and the lead screw body 151 may be formed not only in an integrated manner, but also fixed by welding or the like.
It should be noted that the stopping portion 152 and the screw supporting portion 154 may be formed in different parts, for example, the screw part 15 is provided with two parts extending circumferentially away from the center thereof, and the stopping portion 152 and the screw supporting portion 154 are respectively formed in the above two different parts, that is, the stopping portion 152 and the screw supporting portion 154 are not limited to be an integral structure.
In addition, the outer contour shape of the screw supporting portion 154 and the shape of the through hole of the valve core supporting portion 111 may be alternatively or totally other shapes, and it is easy to understand that only the valve core assembly 11 needs to be supported by the screw supporting portion 154 and not to be separated from the screw member 15 from the top to the bottom.
In the present embodiment, the outer periphery of the restriction portion 153 is substantially circular, and the cross-sectional shape of the inner wall of the spool contact portion 113 is also substantially circular, and at this time, the inner diameter of the spool contact portion 113 is slightly larger than the outer diameter of the restriction portion 153, and the spool assembly 11 can be guided by the restriction portion 153 when moving up and down with respect to the screw member 15.
Of course, the sectional shape of the inner wall of the valve body abutment portion 113 and the outer contour shape of the regulating portion 153 may be alternatively or entirely different shapes, and it is only necessary that the valve body assembly 11 is not blocked by the regulating portion 153 during movement.
Referring to fig. 4, in the spool screw assembly 1, when the spool assembly 11 does not receive any force other than the force received in the natural state, the spool abutting portion 113 and the washer portion 13 do not abut against each other, that is, an axial distance D1 exists between the spool abutting portion 113 and the washer portion 13.
In the electronic expansion valve provided in this embodiment, when the refrigerant flow rate is from the fully open state to the fully closed state, the screw member 15 gradually descends, the valve body assembly 11 suspended and supported by the screw member 15 also descends along with the descending of the screw member 15, when the valve body assembly 11 is not yet in contact with the valve port portion 211, a gap exists between the valve body abutment portion 113 and the gasket portion 13, and the valve body abutment portion 113 and the gasket portion 13 do not abut against each other.
As the screw member 15 continues to gradually descend, the valve plug sealing portion 114 abuts against the valve port sealing portion 211A, after the valve plug sealing portion 114 abuts against the valve port sealing portion 211A, the valve plug assembly 11 is supported on the valve port 211, and if the screw member 15 continues to descend, the valve plug assembly 11 does not descend along with further descent of the screw member 15, at this time, the state of the valve plug assembly 11 supported on the screw member 15 changes to the state of being supported on the valve port sealing portion 211A, and the distance between the valve plug abutting portion 113 and the gasket portion 13 decreases along with descent of the screw member 15.
When the distance between the valve body abutment portion 113 and the washer portion 13 becomes 0, the valve body abutment portion 113 starts to abut against the washer portion 13, and at this time, the valve body assembly 11 is at a critical point at which the valve body assembly 11 starts to receive the elastic load of the elastic member 14, and the valve body assembly 11 is about to receive the elastic load of the elastic member 14.
Therefore, in the electronic expansion valve provided in the present embodiment, before the elastic element 14 is not further compressed, the valve core assembly 11 is suspended from the screw support portion 154 through the valve core support portion 111, and the distance between the valve core abutment portion 113 and the washer portion 13 is >0, the valve core assembly 11 is not abutted against the washer portion 13, and the elastic load of the elastic element 14 is borne by the limiting portion 153 through the washer portion 13, so that the elastic load of the elastic element 14 cannot be transmitted to the valve core assembly 11 through the washer portion 13, and the friction force received by the valve core assembly 11 when the screw member 15 rotates can be reduced.
In addition, in the present application, at the moment when the valve core assembly 11 contacts the valve port portion 211, the force applied to the valve port portion 211 does not include the elastic force of the elastic element 14, while in the background art, please refer to fig. 10 specifically, since the valve core is always subjected to the elastic load of the elastic element, at the moment when the valve core contacts the valve port, the force applied to the valve port is the elastic force of the elastic element and the gravity of the valve core (without considering the force such as differential pressure force), the impact force applied to the valve port is large, and the wear of the valve port is also serious.
In this embodiment, when the valve body abutting portion 113 abuts against the gasket portion 13, the elastic load of the elastic member 14 is transmitted to the valve body assembly 11 through the gasket portion 13, and the valve body sealing portion 114 and the valve port sealing portion 211A can be more tightly engaged, and at this time, the valve body assembly 11 receives the elastic load of the elastic member 14, and when the screw member 15 rotates, the rotational frictional engagement surface is mainly between the retainer portion 13 and the valve body abutting portion 113, and in order to further reduce the frictional resistance of the relative rotation, a coating having a lubricating wear-resistant function (for example, a coating containing polytetrafluoroethylene, or containing graphite, or containing a molybdenum disulfide component) can be sprayed or plated on the surface of the retainer portion 13 or the valve body abutting portion 113, thereby improving the service life of the electronic expansion valve.
In this embodiment, the diameter of the limiting portion 153 is larger than the inner diameter of the washer portion 13, and at this time, the washer portion 13 may be supported by the limiting portion 153 without coming off from the lower end of the screw member 15, and of course, either or both of the outer contour shape of the limiting portion 153 and the inner hole shape of the washer portion 13 may be set to be circular, as long as it is ensured that the washer portion 13 can be supported by the limiting portion 153 and the washer portion 13 does not come off from the screw member 15, and when the washer portion 13 includes two or more components, the inner diameter of the washer portion 13 is determined by the smallest inner diameter of all the components.
It should be noted that the restricting portion 153 may be formed in a different manner, for example, the restricting portion 153 may be fixedly connected to the lead screw body 151 by welding, screwing, or the like, a screw thread may be provided at a lower end of the lead screw body 151, a nut may be screwed to the lead screw body 151, and the nut may form the restricting portion 153.
In the electronic expansion valve provided by this embodiment, the elastic element 14 is externally sleeved on the screw 151, the upper end of the elastic element 14 abuts against the stopping portion 152, the lower end of the elastic element 14 abuts against the limiting portion 153 (indirectly), and the elastic element 14 is engaged with the screw member 15, so that the situation that the elastic element 14 deflects can be relatively reduced, and the eccentric wear of the valve core 11 can be reduced.
The present application will be described below with reference to different operating states of the electronic expansion valve, and please refer to fig. 3-4 specifically, fig. 3 is a partial cross-sectional view of a first embodiment of the electronic expansion valve provided by the present invention in a fully open state, and fig. 4 is a cross-sectional view of a spool rod assembly in fig. 3.
When the electronic expansion valve is in a fully open state, the stroke of the valve core sealing portion 114 from the valve port sealing portion 211A is L, at this time, the elastic member 14 is in its initial compression state, the slidable gasket portion 13 disposed on the screw rod member 15 abuts against the limiting portion 153, and the valve core assembly 11 is not directly or indirectly subjected to an elastic load generated by the elastic member 14. The valve core assembly 11 is suspended from the screw support portion 154 through the valve core support portion 111, the lower surface of the washer portion 13 abuts against the limiting portion 153, and at this time, the washer portion 13 has a certain amount of clearance D1 from the valve core abutment portion 113, so that the valve core assembly 11 is not subjected to the elastic load generated by the elastic member 14.
Further, as the rotor assembly 4 rotates, the screw rod 151 undergoes a displacement motion in the axial direction, and the distance of the valve body sealing portion 114 from the valve port sealing portion 211A also changes.
Referring to fig. 5 and 6 in detail, fig. 5 is a partial cross-sectional view of a valve element 11 of a first embodiment of an electronic expansion valve according to the present invention just before contacting a valve port sealing portion 211A, and fig. 6 is a cross-sectional view of a valve element rod assembly in fig. 5;
at this time, the electronic expansion valve is in the state shown in fig. 3 until the valve element sealing portion 114 just contacts the valve port sealing portion 211A, the displacement amount of the downward movement of the valve element assembly 11 is L, the elastic member 14 is always in its initial compression state in the process, the gasket portion 13 disposed on the screw member 15 always abuts against the limiting portion 153, the valve element assembly 11 is also not subjected to the elastic load generated by the elastic member 14 in this state, and at this time, a certain amount of gap D1 is still maintained between the lower surface of the gasket portion 13 and the valve element abutting portion 113.
Referring to fig. 7 and 8 in particular, fig. 7 is a partial cross-sectional view of the elastic member 14 of the first embodiment of the electronic expansion valve provided in the present invention at a critical point where the elastic member is not yet compressed; fig. 8 is a cross-sectional view of the valve spool stem assembly of fig. 7.
The screw member 15 in fig. 7 continues to move down by the amount of displacement D1 as compared with the state in fig. 5-6, at which point the washer portion 13 and the spool abutment portion 113 are just at the critical point of contact, at which point the elastic member 14 is at the critical point to be further compressed, and at which point the spool assembly 11 is at the critical point to receive the elastic load of the elastic member 14 to be further compressed.
Referring to fig. 1-2, fig. 1 is a partial cross-sectional view of a fully closed state of a first embodiment of an electronic expansion valve according to the present invention, and fig. 2 is a cross-sectional view of a spool rod assembly of fig. 1. The screw member 15 in fig. 1 continues to move downward by the displacement amount α as compared with the state in fig. 7 to 8, at which time the gasket portion 13 has abutted against the spool abutment portion 113 of the spool assembly 11 and the elastic member 14 is further compressed, the spool sealing portion 114 has abutted against and pressed against the valve port sealing portion 211A, and the spool assembly 11 is loaded by the elastic force generated by the elastic member 14 which is further compressed. At this time, the electronic expansion valve is in the fully closed state, the screw rod 151 is at the lowermost end position of its stroke, and the stroke of the screw rod member 15 downward from the fully open state to the fully closed state is L + α + D1.
At this time, the valve body contact portion 113 contacts the washer portion 13, and the washer portion 13 is pushed up by the valve body 11 and moved by a predetermined distance α. The valve core assembly 11 is subjected to the elastic load of the elastic member 14 (transmitted to the valve core assembly 11 by the gasket portion 13), and the elastic load can provide a valve closing force of the valve core assembly 11, so as to reduce as much as possible the situation that the refrigerant overcomes the elastic force of the elastic member 14 and the gravity of the valve core assembly 11 to open the valve opening portion 211 in the valve closing state when the electronic expansion valve uses the second connecting pipe portion 23 as an inlet pipe.
In addition, referring to fig. 2 specifically, the screw rod 15 of the present embodiment may further include a screw rod lower groove 156, the screw rod lower groove 156 is formed by being recessed approximately along the circumferential direction of the surface of the screw rod 15, at this time, the limiting portion 153 is located below the screw rod lower groove 156, the washer portion 13 is disposed in the screw rod lower groove 156, at this time, the washer portion 13 is connected to the screw rod lower groove 156 in a limiting manner, in the present embodiment, the limiting portion 153 and the screw rod main body 151 are integrally formed, and the limiting portion 153 is approximately formed by extending along the circumferential direction away from the approximately lower end of the screw rod main body 151.
The gasket portion 13 provided in this embodiment may adopt a manner of combining a circlip and a gasket, that is, in this embodiment, the gasket portion 13 includes both the circlip and the gasket, and of course, from the functional principle of the present invention, the circlip of the gasket portion 13 in this embodiment is not limited to the C-shaped circlip, and may also be replaced by circlips of other shapes; similarly, the gasket in the present embodiment is not limited to a circular gasket, and other retaining rings that can perform the same function may be used instead, for example, a split retaining ring may be used instead, and the gasket portion 13 of the present invention may be only one of a split retaining ring and a gasket, and the technical effect of the gasket portion 13 may also be achieved, and of course, the gasket portion 13 may also be formed by 3 or more parts. The split retainer ring of the invention is as follows: a member having an opening and having a hollow interior; the gasket of the invention refers to: a hollow member having no opening.
In addition, the guide seat 24 is provided with an inner hole guide portion 241, the inner hole guide portion 241 is a substantially cylindrical inner annular wall structure, the peripheral wall portion 112 can be in clearance fit with the guide seat 24, specifically, the peripheral wall portion 112 of the valve core assembly is in clearance fit with the inner hole guide portion 241 of the guide seat 24, and can be guided by the guide seat 24 in the up-and-down moving process of the valve assembly, which is more favorable for ensuring the coaxiality of the valve core assembly 11 and the valve mouth portion 211, and reducing the deflection of the valve core assembly 11 relative to the valve mouth portion 211, thereby reducing the eccentric wear of the valve core assembly 11, improving the service life of the electronic expansion valve, and reducing the noise generated by the valve mouth portion 211 and the valve core assembly 11 due to the influence of the coaxiality. It should be noted that the guide seat 24 provided by the present invention is not limited to the integrally formed structure, and the guide seat 24 may be assembled by two or more components, and in the case where no specific description is given, the other components provided by the present invention are also applicable, and the present application is not limited to the form in which the valve port portion 211 is formed in the guide seat 24, and may also adopt the form in which the valve port portion 211 is formed in the valve seat 21 or other components, and the inner hole guide portion 241 having the guide function is fixed to the valve seat 21.
Second embodiment
Referring to fig. 9, fig. 9 is a sectional view of a spool screw assembly of an electronic expansion valve according to a second embodiment; the stopping portion 152 of the electronic expansion valve of the present application is not limited to the above structure, for example, the screw member 15 may further include a screw upper groove portion 155, the screw upper groove portion 155 is formed by being recessed substantially along the surface of the screw body portion 151, in this case, an upper retaining ring 15B is disposed in the screw upper groove portion 155, in this embodiment, an end surface of the upper retaining ring 15B abutting against the elastic member 14 forms the stopping portion 152, an end surface of the upper retaining ring 15B supporting the valve core assembly 11 forms a screw supporting portion 154, and the upper retaining ring 15B is clamped or limited in the screw upper groove portion 155.
Of course, the stopping portion 152 may be formed in other forms, for example, an external thread is provided on the screw rod member 15, a stopping member provided with an internal thread is connected to the screw rod member 15 by a thread, the screw rod member 15 is in thread fit with the stopping member, the stopping portion 152 is formed on the end surface of the stopping member abutting against the elastic member 14, and when the screw rod supporting portion 154 and the stopping portion 152 are formed in the same component, the screw rod supporting portion 154 is formed on the upper end surface of the stopping member; when the screw supporting portion 154 and the stopping portion 152 are not formed in the same component, the screw supporting portion 154 may also adopt a structure similar to the stopping portion 152.
In the present embodiment, the structure of the valve body assembly 11 is also changed to a certain extent, and in the present embodiment, the peripheral wall portion 112, the valve body contact portion 113, and the valve body sealing portion 114 are integrally formed, and the valve body support portion 111 is fixedly connected to the peripheral wall portion 112; of course, the peripheral wall portion 122 and the valve body 11B may be fixedly connected, and the valve body support portion 111 and the peripheral wall portion 112 may be fixedly connected.
It should be noted that the present invention mainly aims to improve the valve core screw rod assembly 1 of the electronic expansion valve, and other components of the electronic expansion valve, such as the rotor assembly 4, the nut assembly 3, and the like, can adopt a general technology, and can also adopt other electronic expansion valve structures capable of realizing the same function.
It should be noted that the term "against" in this specification includes direct and indirect against, and the term "support" in this specification includes direct support and indirect support, and the terms of orientation such as up, down, left, right, etc. mentioned in this embodiment are all introduced for convenience of description based on the drawings in this specification; and the use of ordinal numbers such as "first," "second," etc., in the component names, are also included for convenience of description and are not intended to imply any limitation on the order in which the components are recited.
The electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (9)

1. The electronic expansion valve is characterized by comprising a valve core screw rod assembly (1), wherein the valve core screw rod assembly (1) comprises a valve core assembly (11), a gasket part (13), an elastic part (14) and a screw rod part (15);
the screw rod component (15) comprises a screw rod body part (151), a stopping part (152), a limiting part (153) and a screw rod supporting part (154), the elastic piece (14) is sleeved on the screw rod body part (151), the upper end part of the elastic piece (14) is abutted against the stopping part (152), the lower end part of the elastic piece (14) is abutted against the gasket part (13), the limiting part (153) can be abutted against the gasket part (13), and the gasket part (13) is in limit connection with the screw rod component (15);
the valve core assembly (11) comprises a valve core supporting part (111) and a valve core abutting part (113), the lower end of the screw rod component (15) is positioned in the valve core assembly (11), the screw rod supporting part (154) can abut against the valve core supporting part (111), and the valve core abutting part (113) can abut against the gasket part (13);
the valve core assembly (11) is in limit connection with the screw rod component (15);
when the screw support portion (154) abuts against the valve element support portion (111), the valve element abutment portion (113) does not abut against the washer portion (13).
2. An electronic expansion valve according to claim 1, wherein the lead screw member (15) includes an upper flange portion (15A), the upper flange portion (15A) extending in a circumferential direction of the lead screw body portion (151), a lower end face of the upper flange portion (15A) abutting an upper end portion of the elastic member (14), the upper flange portion (15A) including the stopper (152).
3. The electronic expansion valve according to claim 2, wherein an upper end face of the upper flange portion (15A) is capable of abutting against the spool support portion (111), the upper flange portion (15A) including the lead screw support portion (154).
4. The electronic expansion valve according to claim 1, wherein the screw member (15) comprises a screw upper groove portion (155), the screw upper groove portion (155) being recessed along a circumferential direction of the screw body portion (151);
the screw rod component (15) further comprises an upper retainer ring (15B), the upper retainer ring (15B) is located in the upper groove portion (11) of the screw rod, the lower end face of the upper retainer ring (15B) is abutted to the upper end portion of the elastic piece (14), and the upper retainer ring (15B) comprises a stopping portion (152).
5. An electronic expansion valve according to claim 4, wherein an upper end face of the upper retainer (15B) is abuttable against the spool support portion (111), the upper retainer (15B) comprising the lead screw support portion (154).
6. The electronic expansion valve according to claim 1, wherein the valve core assembly (11) includes a valve core sleeve (11A) and a valve core (11B), a lower end of the valve core sleeve (11A) is open, and includes the valve core support portion (111) and a peripheral wall portion (112), a distance from the valve core support portion (111) to an axis of the valve core assembly (11) is closer to a distance from the peripheral wall portion (112) to the axis of the valve core assembly (11), the valve core (11B) includes the valve core abutting portion (113), the valve core abutting portion (113) extends into a lower end opening of the peripheral wall portion (112), and the valve core sleeve (11A) and the valve core (11B) are fixedly connected.
7. The electronic expansion valve according to claim 1, wherein the screw member (15) comprises a screw lower groove portion (156), the screw lower groove portion (156) being recessed along a circumferential direction of the screw body portion (151); in the axial direction of the valve core assembly (11), the limiting part (153) is positioned below the screw rod groove part (156), the gasket part (13) is positioned in the screw rod lower groove part (156), and the gasket part (13) is in limit connection with the screw rod lower groove part (156).
8. The electronic expansion valve according to any of claims 1-7, further comprising a valve seat assembly (2), wherein the valve seat assembly (2) comprises a valve seat (21) and a guide seat (24), the guide seat (24) is fixedly connected with the valve seat (21), the guide seat (24) comprises an inner bore guide portion (241), the inner bore guide portion (241) has a substantially cylindrical inner annular wall structure, and the valve core assembly (11) is in clearance fit with the guide seat (24).
9. An electronic expansion valve according to any of claims 1-7, wherein the surface of the gasket part (13) comprises a coating comprising polytetrafluoroethylene or graphite or molybdenum disulphide.
CN202110650625.2A 2021-06-11 2021-06-11 Electronic expansion valve Pending CN115467981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110650625.2A CN115467981A (en) 2021-06-11 2021-06-11 Electronic expansion valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110650625.2A CN115467981A (en) 2021-06-11 2021-06-11 Electronic expansion valve

Publications (1)

Publication Number Publication Date
CN115467981A true CN115467981A (en) 2022-12-13

Family

ID=84364560

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110650625.2A Pending CN115467981A (en) 2021-06-11 2021-06-11 Electronic expansion valve

Country Status (1)

Country Link
CN (1) CN115467981A (en)

Similar Documents

Publication Publication Date Title
EP3792529A1 (en) Valve needle assembly and electronic expansion valve having the valve needle assembly
CN113685559A (en) Electronic expansion valve
CN113748287B (en) Electronic expansion valve
CN115467981A (en) Electronic expansion valve
KR102578174B1 (en) Electronic expansion valve
WO2022161429A1 (en) Electrically-operated valve
US11193596B2 (en) Electric valve and manufacturing method therefor
CN112879573A (en) Electronic expansion valve
US11982477B2 (en) Electronic expansion valve
CN111963695A (en) Automobile-used electronic expansion valve and vehicle of low wear structure
CN113775767A (en) Electric valve and assembling method thereof
JP7438565B2 (en) electric valve
CN114719030A (en) Electronic expansion valve
CN113775771A (en) Electric valve
WO2022161426A1 (en) Electric valve
CN220911733U (en) Expansion valve, air conditioner and vehicle
CN115306904A (en) Valve device
CN116336195A (en) Electronic expansion valve
CN116263207A (en) Electronic expansion valve
CN116697063A (en) Electronic expansion valve

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination