CN117249255A - Electronic expansion valve - Google Patents

Electronic expansion valve Download PDF

Info

Publication number
CN117249255A
CN117249255A CN202310912492.0A CN202310912492A CN117249255A CN 117249255 A CN117249255 A CN 117249255A CN 202310912492 A CN202310912492 A CN 202310912492A CN 117249255 A CN117249255 A CN 117249255A
Authority
CN
China
Prior art keywords
section
gap
valve
guide sleeve
electronic expansion
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
CN202310912492.0A
Other languages
Chinese (zh)
Inventor
曾庆军
陈超
杨茂
刘文金
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.)
Guangdong Welling Motor Manufacturing Co Ltd
Original Assignee
Guangdong Welling Motor Manufacturing 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 Guangdong Welling Motor Manufacturing Co Ltd filed Critical Guangdong Welling Motor Manufacturing Co Ltd
Priority to CN202310912492.0A priority Critical patent/CN117249255A/en
Publication of CN117249255A publication Critical patent/CN117249255A/en
Pending legal-status Critical Current

Links

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
    • F16K1/42—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—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
    • 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
    • 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

Abstract

The technical scheme of the invention discloses an electronic expansion valve, which comprises a valve seat, a guide sleeve, a connecting pipe and a welding ring, wherein the valve seat is provided with a valve cavity and a side hole, and the side hole is communicated with the valve cavity; the guide sleeve is arranged in the valve cavity, the axial direction of the guide sleeve comprises a matching section, and a first gap is formed between the matching section and the inner wall of the valve cavity; the connecting pipe comprises an inserting section and an extending section, wherein the inserting section penetrates through the side hole and forms a second gap with the inner wall of the side hole, and the second gap is communicated with the first gap; the extending section extends into the valve cavity and is connected with the guide sleeve; the solder ring fills the first gap and the second gap. According to the electronic expansion valve provided by the invention, the guide sleeve, the valve seat and the connecting pipe pass through the tunnel furnace together, and the welding ring is melted and filled between the valve seat and the connecting pipe and between the guide sleeve and the valve seat, so that the guide sleeve, the valve seat and the connecting pipe are firmly welded, the working procedures of the electronic expansion valve can be reduced, and the welding of 3 parts is realized by one welding ring, so that the cost is low.

Description

Electronic expansion valve
The application is a divisional application with the application number of 202210680573.8, and the application date of the parent application is as follows: 2022, 06, 16; the invention is named as follows: an electronic expansion valve.
Technical Field
The invention relates to the technical field of solder control components, in particular to an electronic expansion valve.
Background
The electronic expansion valve is used for connecting a system pipeline and refrigeration equipment. The electronic expansion valve is provided with a valve core seat, a valve port is arranged on the valve core seat, and a connecting pipe for connecting a system pipeline is arranged outside the valve core seat. The valve core seat and the valve body of the electronic expansion valve are welded in a welding mode of press fitting and laser welding. Because of the limitation of the welding process, when the valve core seat and the valve body of the existing electronic expansion valve are mutually welded, all parts are required to be welded respectively, the working procedure is complex, the operation steps are more, and the cost is high.
Disclosure of Invention
The invention mainly aims to provide an electronic expansion valve, which aims to reduce the welding procedure of the electronic expansion valve.
According to the technical scheme, the electronic expansion valve comprises:
the valve seat is provided with a valve cavity and a side hole, and the side hole is communicated with the valve cavity;
the guide sleeve is arranged in the valve cavity, the axial direction of the guide sleeve comprises a matching section, and a first gap is formed between the matching section and the inner wall of the valve cavity;
the connecting pipe comprises an inserting section and an extending section, the inserting section penetrates through the side hole and forms a second gap with the inner wall of the side hole, and the second gap is communicated with the first gap; the extending section extends into the valve cavity;
and a welding ring filling the first gap and the second gap.
In one embodiment, the first gap has a pitch of less than 0.2mm.
In one embodiment, the second gap has a pitch of less than 0.2mm.
In an embodiment, the guide sleeve further comprises a mating surface, the mating surface is arranged on the bottom wall of the mating section, the mating surface is connected with the mating section, a third gap is formed between the mating surface and the extending section, and the distance between the third gap is smaller than 0.2mm.
In an embodiment, the mating surface is a plane or an arc surface.
In one embodiment, the length of the run-in section is greater than or equal to 0.5mm.
In an embodiment, the guide sleeve further comprises a positioning section in the axial direction, the matching section is arranged between the positioning section and the matching surface, and the positioning section is connected with the matching section and abuts against the inner wall of the valve cavity.
In one embodiment, the guide sleeve has an outer diameter at the locating section that is greater than an outer diameter at the mating section.
In an embodiment, the guide sleeve further comprises a guide section, the matching surface is arranged between the guide section and the positioning section, the guide section is connected with the matching surface, and the end face of the extending section, which faces one end of the valve cavity, is abutted to the guide section.
In an embodiment, the adapter further comprises a main body section and a reducing section, wherein the diameter of the main body section is larger than that of the inserting section, and the reducing section is arranged between the main body section and the inserting section and used for connecting the main body section and the inserting section.
In one embodiment, the welding ring is sleeved on the outer wall of the reducing section.
According to the technical scheme, the electronic expansion valve comprises a valve seat, a guide sleeve, a connecting pipe and a welding ring, wherein the valve seat is provided with a valve cavity and a side hole, the guide sleeve is arranged in the valve cavity, and the connecting pipe extends into the valve cavity through the side hole. The uide bushing includes cooperation section, mating surface and location section, and location section and disk seat butt, cooperation section setting are in location section below, are formed with first clearance between cooperation section and the disk seat. The connecting pipe comprises an inserting section which is arranged below the matching surface, and a second gap is formed between the inserting section and the inner wall of the side hole at the side hole. The first gap and the second gap are communicated with each other, the welding ring is arranged outside the valve seat and sleeved with the connecting pipe, and after the welding ring is melted, the welding ring flows from the second gap to the first gap and fills the first gap and the second gap.
According to the electronic expansion valve provided by the technical scheme of the invention, the guide sleeve, the valve seat and the connecting pipe are welded together through the tunnel furnace, the welding ring is sleeved on the connecting pipe outside the valve seat, and the welding ring is abutted with the connecting pipe and the valve seat, so that the installation is convenient. When in welding, the welding ring is melted, and the welding flux is filled between the valve seat and the connecting pipe and between the guide sleeve and the valve seat, so that the guide sleeve, the valve seat and the connecting pipe are firmly welded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an electronic expansion valve;
FIG. 2 is a schematic structural view of a guide sleeve;
fig. 3 is an enlarged schematic view of fig. 1 at a.
Reference numerals illustrate:
reference numerals Name of the name Reference numerals Name of the name
01 Electronic expansion valve 11 Valve cavity
10 Valve seat 12 Side hole
20 Guide sleeve 21 Positioning section
30 Connecting pipe 22 Mating segment
40 Welding ring 23 Mating surface
31 Extending into section 24 Guide section
32 Insertion section 51 First gap
33 Reducing section 52 Second gap
34 Main body section 53 Third gap
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The electronic expansion valve provided by the invention is an important component in a refrigeration system, and mainly plays roles of throttling, depressurization and flow regulation. The existing electronic expansion valve comprises a valve seat assembly, a shell, a rotor assembly, a nut assembly and a valve needle assembly, wherein the nut assembly is provided with a nut, the nut is provided with threads, the valve needle assembly is provided with a screw rod, the screw rod is provided with threads, the nut is in threaded connection with the threads, the rotor assembly is fixedly connected with the screw rod, the valve seat assembly is provided with a valve port, the valve needle assembly is provided with a valve needle, and the magnetic rotor drives the valve needle to approach or separate from the valve port, so that flow regulation is realized. According to the electronic expansion valve provided by the technical scheme of the invention, the guide sleeve, the valve seat and the connecting pipe are welded together through the tunnel furnace, the welding ring is sleeved on the connecting pipe outside the valve seat, and the welding ring is abutted with the connecting pipe and the valve seat, so that the installation is convenient. When in welding, the welding ring is melted, and the welding flux is filled between the valve seat and the connecting pipe and between the guide sleeve and the valve seat, so that the guide sleeve, the valve seat and the connecting pipe are firmly welded.
The product of the electronic expansion valve welded by the tunnel furnace can be applied to an air conditioning system, and the fluid medium flowing through the electronic expansion valve is a refrigerant used for carrying out cold and heat exchange in the air conditioning system. At this time, the electronic expansion valve is installed at the inlet of the evaporator of the air conditioning system, and the electronic expansion valve is used as a demarcation element between the high-pressure side and the low-pressure side of the air conditioning system, so that the high-pressure liquid refrigerant from the liquid storage dryer and other devices is throttled and depressurized, and the dosage of the liquid refrigerant entering the evaporator is regulated and controlled, so that the dosage of the liquid refrigerant can meet the requirements of external refrigeration load. Or, the electronic expansion valve may be applied to other types of refrigeration apparatuses, and the fluid medium flowing through the electronic expansion valve may be other fluid medium besides a refrigerant, so long as the electronic expansion valve can realize throttling and depressurization of the fluid medium, which is not particularly limited.
The welding flux mentioned in the invention refers to the fluid welding material after the welding ring is melted when the directional sleeve, the valve seat and the connecting pipe are welded together through the tunnel furnace. The solder is in a fluid state and can flow among the valve seat, the connecting pipe and the guide sleeve so as to fill the space between the valve seat and the connecting pipe and the space between the guide sleeve and the valve seat, so that the guide sleeve, the valve seat and the connecting pipe are firmly welded.
Referring to fig. 1 to 3, the present invention proposes an electronic expansion valve 01, wherein the electronic expansion valve 01 comprises a valve seat 10, a guide sleeve 20, a connecting tube 30 and a welding ring 40, the valve seat 10 is provided with a valve cavity 11 and a side hole 12, and the side hole 12 is communicated with the valve cavity 11; the guide sleeve 20 is arranged in the valve cavity 11, the guide sleeve 20 comprises a matching section 22 in the axial direction, and a first gap 51 is formed between the matching section 22 and the inner wall of the valve cavity 11; the adapter tube 30 comprises an insertion section 32 and an extension section 31, wherein the insertion section 32 passes through the side hole 12 and forms a second gap 52 with the inner wall of the side hole 12, and the second gap 52 is communicated with the first gap 51; the extending section 31 extends into the valve chamber 11; the weld ring 40 is sleeved with the adapter tube 30 and abuts against the outer wall of the valve seat 10, so that the weld ring 40 flows from the second gap 52 to the first gap 51 after being melted, and fills the first gap 51 and the second gap 52.
Specifically, the valve seat 10 is manufactured by machining a stainless steel material, and the valve seat 10 is arranged in a substantially cylindrical shape. It will be appreciated that in other embodiments, the valve seat 10 may be manufactured from other materials, and that the valve seat 10 may take shapes other than cylindrical, as is not illustrated herein. The valve seat 10 is internally provided with a valve cavity 11, the side wall of the valve seat 10 is provided with a side hole 12, and the side hole 12 is communicated with the valve cavity 11. A guide sleeve 20 is fixedly mounted in the valve chamber 11, which guide sleeve 20 serves to guide the movement of the valve needle assembly. The guide sleeve 20 includes a fitting section 22 in the axial direction, and at the fitting section 22, the outer wall of the guide sleeve 20 is clearance-fitted with the inner wall of the valve chamber 11, and a first clearance 51 is formed between the fitting section 22 and the inner wall of the valve chamber 11. The first gap 51 extends circumferentially along the inner wall of the valve chamber 11 and is cylindrical. The length of the first gap 51 in the axial direction is the same as the length of the mating segment 22 in the axial direction. The adapter tube 30 includes an insertion section 32 and an extension section 31, and both the outer diameter of the insertion section 32 and the outer diameter of the extension section 31 are smaller than the inner diameter of the side hole 12, and the adapter tube 30 passes through the side hole 12 and extends into the valve chamber 11. The portion of the adapter tube 30 penetrating the side hole 12 is an insertion section 32, and the portion of the adapter tube 30 extending into the valve chamber 11 is an insertion section 31. The outer diameter of the insertion section 32 is smaller than the inner diameter of the side hole 12, the insertion section 32 is in clearance fit with the inner wall of the side hole 12, and a second clearance 52 is formed between the insertion section 32 and the inner wall of the side hole 12. The second gap 52 extends circumferentially along the inner wall of the side hole 12 and is cylindrical. The length of the second gap 52 in the axial direction is the same as the length of the insertion section 32 in the axial direction or the thickness of the side hole 12. The second gap 52 communicates with the first gap 51, and the solder may flow from the first gap 51 to the second gap 52 or from the second gap 52 to the first gap 51. The extending section 31 extends into the valve cavity 11 and is connected with the guide sleeve 20, the extending section 31 is connected with the guide sleeve 20 and forms a closed port at the branch of the flow path of the first gap 51 and the second gap 52, so that solder is prevented from flowing out from between the extending section 31 and the guide sleeve 20 in the process of flowing from the second gap 52 to the first gap 51, and the solder cannot fill the first gap 51. The weld ring 40 is sleeved with the adapter tube 30 and abuts against the outer wall of the valve seat 10, so that the weld ring 40 flows from the second gap 52 to the first gap 51 after being melted, and fills the first gap 51 and the second gap 52. The welding ring 40 is annular, the welding ring 40 is sleeved on the outer wall of the connecting pipe 30, and the welding ring 40 is abutted with the outer wall of the valve seat 10. When the valve seat 10, the guide sleeve 20 and the connecting pipe 30 are welded together through the tunnel furnace, the welding ring 40 sleeved on the outer wall of the connecting pipe 30 starts to melt, and the welding flux of the welding ring 40 is in a welding flux shape after the welding ring is melted and can flow. Solder can flow into the valve chamber 11 through the second gap 52 due to capillary action, and flow from the junction of the first gap 51 and the second gap 52 to the first gap 51. The first gap 51 and the second gap 52 are filled with solder so that the valve seat 10, the guide bush 20, and the adapter tube 30 are welded together.
According to the technical scheme, the electronic expansion valve 01 is provided, and the electronic expansion valve 01 comprises a valve seat 10, a guide sleeve 20, a connecting pipe 30 and a welding ring 40, wherein gaps are respectively formed between the valve seat 10 and the guide sleeve 20 and between the valve seat 10 and the connecting pipe 30, and the welding ring 40 is sleeved on the connecting pipe 30. The welding ring 40 is sleeved on the connecting pipe 30 outside the valve seat 10, and the welding ring 40 is abutted with the connecting pipe 30 and the valve seat 10, so that the installation is convenient. The guide sleeve 20, the valve seat 10 and the connecting pipe 30 are welded together through the tunnel furnace, and when welding, the welding ring 40 is melted, and the welding flux fills the space between the valve seat 10 and the connecting pipe 30 and the space between the guide sleeve 20 and the valve seat 10 by capillary action, so that the guide sleeve 20, the valve seat 10 and the connecting pipe 30 are firmly welded. The electronic expansion valve 01 provided by the invention can reduce the welding procedure of the electronic expansion valve 01 of the laser welding of the guide sleeve 20 and the valve seat 10 in the prior art, and only one welding ring 40 is required to be arranged to solve the welding of 3 parts, thereby not only simplifying the welding procedure, but also reducing the cost.
In one embodiment, the first gap 51 is less than 0.2mm apart. Referring to fig. 1 and 3, in the electronic expansion valve 01 according to the present invention, gaps are respectively provided between the valve seat 10 and the guide sleeve 20, and between the valve seat 10 and the adapter tube 30, and due to capillary action, molten solder flows along the gaps between the valve seat 10 and the guide sleeve 20, and between the valve seat 10 and the adapter tube 30, and fills the first gap 51 and the second gap 52. Capillary action is also called capillary phenomenon, in which a tubule is inserted into a liquid, and the liquid rises or falls in the tubule, and the phenomenon generated at the solid, liquid and gas three-phase interface is called capillary phenomenon. The height of the rise and fall of the liquid in the capillary phenomenon can be determined by the following formula: h=2γcosθ/(ρgr). Wherein, gamma is surface tension; θ is the contact angle; ρ is the liquid density; g is gravity acceleration; r is the radius of the tubule. It will be appreciated that the height of the rise and fall of the liquid in the capillary phenomenon is related to the radius of the tubule. In the electronic expansion valve 01 proposed by the present invention, the degree of solder flow and how much the first gap 51 and the second gap 52 are filled are related to the pitch of the first gap 51 and the second gap 52. The matching section 22 and the inner wall of the valve cavity 11 are formed with a first gap 51, and the distance between the first gap 51 is L 1 ，0＜L 1 < 0.2mm. It will be appreciated that the mating segment 22 is in clearance fit with the inner wall of the valve chamber 11 so that the first gap 51 is spaced more than 0. When the distance between the first gaps 51 is greater than 0.2mm, capillary action is insignificant, and solder may not flow from the second gap 52 to the first gaps 51, and the first gaps 51 are filled with little or no solder, so that the welding between the valve seat 10 and the guide sleeve 20 is weak or even impossible. The first gap 51 is less than 0.2mm apart. The pitch of the first gap 51 may be any value between 0 and 0.2mm, for example, the pitch of the first gap 51 may be 0.01mm, may be 0.15mm, may be 0.18mm, or the like.
In one embodiment, the spacing of the second gap 52 is less than 0.2mm. Referring to fig. 1 and 3, as can be seen from the above embodiments, the melted solder flows along the gap between the valve seat 10 and the guide sleeve 20, and between the valve seat 10 and the adapter tube 30 due to capillary action, and fills the first gap 51 and the second gap 52. The degree of solder flow and how much of the first gap 51 and the second gap 52 are filled are related to the spacing of the first gap 51 and the second gap 52. The insertion section 32 and the inner wall of the side hole 12 are formed with a second gap 52, and the distance between the second gap 52 is L 2 ，0＜L 2 < 0.2mm. It will be appreciated that the insertion section 32 is in clearance fit with the inner wall of the side hole 12 so that the second gap 52 is spaced more than 0. When the distance between the second gaps 52 is greater than 0.2mm, on the one hand, capillary action may be insignificant, solder may not flow from the second gaps 52 to the first gaps 51, and the first gaps 51 may be filled with little or no solder, so that the welding between the valve seat 10 and the guide sleeve 20 is weak or even impossible. On the other hand, too large a distance between the second gaps 52, the increase in solder required to fill the second gaps 52 may result in insufficient solder flowing to the first gaps 51, and thus the welding between the valve seat 10 and the guide sleeve 20 may be weak or even impossible. The second gap 52 is less than 0.2mm apart. The pitch of the second gap 52 may be any value between 0 and 0.2mm, for example, the pitch of the second gap 52 may be 0.05mm, may be 0.12mm, may be 0.19mm, and so on. In other embodiments, the spacing of the first gap 51 and the spacing of the second gap 52 may be the same, e.g., when the spacing of the first gap 51 is 0.12mm52 are also 0.12mm apart. The pitch of the first gap 51 and the pitch of the second gap 52 may also be different, for example, when the pitch of the first gap 51 is 0.12mm, the pitch of the second gap 52 may be 0.06mm, or the like. There is no limitation in this regard.
In an embodiment, the guide sleeve 20 further includes a mating surface 23, where the mating surface 23 is disposed on a bottom wall of the mating section 22, and the mating surface 23 is connected to the mating section 22, and a third gap 53 is formed between the mating surface 23 and the extending section 31, and a distance between the third gap 53 is less than 0.2mm. Referring to fig. 1 to 3, the mating surface 23 is disposed on the bottom wall of the mating section 22, the mating surface 23 is connected to the mating section 22, the mating surface 23 is in clearance fit with the extending section 31, and a third clearance 53 is formed between the mating surface 23 and the extending section 31. The melted solder flows from the second gap 52 to the position where the first gap 51 communicates with the second gap 52, and a part of the solder flows to the first gap 51 due to capillary action and fills the first gap 51, so that the guide sleeve 20 and the valve seat 10 are welded together. Another portion of the solder flows to the third gap 53 and fills the third gap 53 so that the guide sleeve 20 and the adapter tube 30 are welded together. A third gap 53 is formed between the mating surface 23 and the projecting section 31, and the distance between the third gaps 53 is L 3 ，0＜L 3 < 0.2mm. It will be appreciated that the run-in section 31 is in clearance fit with the mating surface 23 so that the third gap 53 is spaced more than 0. When the distance between the third gaps 53 is greater than 0.2mm, on the one hand, capillary action may be insignificant, and the third gaps 53 may not be uniformly filled or filled with the solder, so that the welding between the adapter tube 30 and the guide bush 20 is weak or even impossible. On the other hand, the third gap 53 is excessively large in pitch, and the solder required to fill the third gap 53 increases, which may result in insufficient solder flowing to the first gap 51, so that the welding between the valve seat 10 and the guide sleeve 20 is weak or even impossible. The third gap 53 has a pitch of less than 0.2mm. The pitch of the second gap 52 may be any value between 0 and 0.2mm, for example, the pitch of the second gap 52 may be 0.02mm, 0.9mm, 0.16mm, or the like. In other embodiments, the pitch of the third gap 53 may be the same as or different from the pitch of the first gap 51 and the pitch of the second gap 52, which is not limited herein.
In another embodiment, the mating surface 23 and the protruding section 31 may be an interference fit, only by providing a passage where the first gap 51 and the second gap 52 communicate so that solder may flow from the second gap 52 to the first gap 51. The solder fills the first gap 51 and the second gap 52 so that the guide sleeve 20 and the valve seat 10, the valve seat 10 and the adapter tube 30 are welded together, the matching surface 23 is in interference fit with the extending section 31, and the guide sleeve 20 and the valve seat 10 and the adapter tube 30 can be tightly connected.
In one embodiment, the mating surface 23 is a planar or arcuate surface. Referring to fig. 2, the mating surface 23 may be a plane surface or an arc surface. When the mating surface 23 is planar, the pitch of the third gap 53 is equal everywhere in the direction from the first gap 51 to the third gap 53. When the mating surface 23 is a cambered surface, the pitch of the third gap 53 gradually decreases in the direction from the first gap 51 to the third gap 53. The mating surface 23 may be both a plane and an arc, for example, the mating surface 23 may be an arc where the first gap 51 communicates with the second gap 52, and the pitch thereof may gradually decrease in the direction from the first gap 51 to the third gap 53; the mating face 23 is planar in the rest position, with the spacing being everywhere equal in the direction from the first gap 51 to the third gap 53.
In one embodiment, the length of the run-in section 31 is greater than or equal to 0.5mm. Referring to fig. 1 and 3, the extending section 31 is a portion of the adapter tube 30 extending into the valve cavity 11, and the extending section 31 plays at least two roles in the technical scheme of the present invention. First, the guiding and communicating functions are performed at the communication position between the first gap 51 and the second gap 52, so that the solder can smoothly flow from the second gap 52 to the first gap 51, and the flow break of the solder at the communication position between the first gap 51 and the second gap 52 is avoided. Secondly, the extending section 31 and the matching surface 23 are in clearance fit to form a third gap 53, and the welding flux fills the third gap 53 to enable the guide sleeve 20 and the connecting pipe 30 to be welded together, so that the electronic expansion valve 01 is more compact and stable in structure. The length of the extension 31 is not too short, and in this embodiment, the length of the extension 31 is 0.5mm or more. The welding flux is prevented from flowing out at the position where the first gap 51 is communicated with the second gap 52, the welding flux is fully filled in the position where the third gap 53 is filled, and the guide sleeve 20 and the connecting pipe 30 are firmly welded.
In an embodiment, the guide sleeve 20 further includes a positioning section 21 in the axial direction, and a mating section 22 is disposed between the positioning section 21 and the mating surface 23, and the positioning section 21 is connected to the mating section 22 and abuts against the inner wall of the valve cavity 11. Referring to fig. 1 and 2, in the direction from the first gap 51 to the third gap 53, the guide sleeve 20 sequentially includes a positioning section 21, a mating section 22 and a mating surface 23, and the positioning section 21 abuts against the inner wall of the valve cavity 11. The positioning section 21 is used to determine the position of the guide sleeve 20 connected to the valve seat 10. The positioning section 21 is connected with the matching section 22, and after the position of the positioning section 21 abutting against the inner wall of the valve cavity 11 is fixed, the position of the first gap 51 can also be fixed. It will be appreciated that the position of the first gap 51 is determined by the positioning segment 21.
In one embodiment, the guide sleeve 20 has a larger outer diameter at the locating section 21 than at the mating section 22. Referring to fig. 1 and 2, the positioning section 21 abuts against the inner wall of the valve cavity 11, and the matching section 22 is in clearance fit with the inner wall of the valve cavity 11. Therefore, when the outer diameter of the guide sleeve 20 at the positioning section 21 is smaller than or equal to the outer diameter at the matching section 22, the inner wall of the valve cavity 11 has concave-convex relief, so that the processing difficulty is high, and the production and the manufacturing are inconvenient. The outer diameter of the guide sleeve 20 at the positioning section 21 is larger than the outer diameter at the matching section 22, and the portion of the guide sleeve 20 at the positioning section 21, which is larger than the outer diameter at the matching section 22, is the size of the first gap 51 interval. The inner wall of the valve cavity 11 is flat, and the processing and the manufacturing are convenient. As is clear from the above embodiment, the distance between the first gaps 51 is smaller than 0.2mm, and the difference between the outer diameter of the guide sleeve 20 at the positioning section 21 and the outer diameter at the mating section 22 is smaller than 0.2mm.
In an embodiment, the guide sleeve 20 further includes a guide section 24, the mating surface 23 is disposed between the guide section 24 and the positioning section 21, the guide section 24 is connected to the mating surface 23, and an end surface of the extending section 31 facing one end of the valve cavity 11 abuts against the guide section 24. Referring to fig. 2 and 3, the guide sleeve 20 further includes a guide section 24, and the guide section 24 plays a role in guiding the movement of the needle assembly. In the direction from the first gap 51 to the third gap 53, the guide sleeve 20 sequentially includes a positioning section 21, a mating section 22, a mating surface 23 and a guide section 24, the guide section 24 is connected with the mating surface 23, and the guide section 24 abuts against an end face of the extending section 31 facing one end of the valve cavity 11. The guide section 24 is abutted with the extending section 31, so that loosening and shaking are not easy to occur between the parts, and the connection between the guide sleeve 20 and the connecting pipe 30 is more compact and stable. On the other hand, the solder flows to the third gap 53, and since the guide section 24 abuts against the end face of the extension section 31, the solder is prevented from running away from the end face of the extension section 31, and it is ensured that sufficient solder can flow to the first gap 51.
In one embodiment, the adapter 30 further includes a main body section 34 and a reducing section 33, the main body section 34 having a larger diameter than the insert section 32, the reducing section 33 being disposed between the main body section 34 and the insert section 32 for connecting the main body section 34 and the insert section 32. Referring to fig. 1, the product of the electronic expansion valve 01 welded by the tunnel furnace according to the present invention can be applied to an air conditioning system to adjust and control the dosage of the liquid refrigerant entering the evaporator, so that the dosage of the liquid refrigerant can adapt to the requirement of external refrigeration load. The adapter tube 30 further comprises a main body section 34, and the main body section 34 is used for flowing the liquid refrigerant into the electronic expansion valve 01 or flowing the liquid refrigerant out of the electronic expansion valve 01. The diameter of the main body section 34 is larger than the diameter of the insertion section 32, and a reducing section 33 is provided at the junction of the main body section 34 and the insertion section 32. The reducing section 33 is disposed between the main body section 34 and the insertion section 32 to connect the main body section 34 and the insertion section 32. The diameter of the variable-diameter section 33 gradually decreases from the same diameter as the main body section 34 to the same diameter as the insertion section 32 in the direction from the main body section 34 to the insertion section 32. The reducing section 33 forms a slope at the junction of the main section 34 and the insert section 32.
In one embodiment, the weld ring 40 is sleeved on the outer wall of the reducing section 33. Referring to fig. 1 and 3, the welding ring 40 is annular and is sleeved on the outer wall of the reducing section 33. The reducing section 33 forms a slope at the junction of the main body section 34 and the insertion section 32, and the reducing section 33 forms an included angle with the outer wall of the valve seat 10. The welding ring 40 is fixed at the included angle between the reducing section 33 and the outer wall of the valve seat 10, and is abutted against the outer wall of the valve seat 10. The weld ring 40 is not easily slid in the length direction of the adapter tube 30, and when the valve seat 10, the adapter tube 30 and the guide sleeve 20 are welded together by the tunnel furnace, the weld ring 40 is melted and then directly flows into the valve cavity 11 from the second gap 52, and then flows to the first gap 51 and the third gap 53. The conditions of solder loss and insufficient solder filling are greatly avoided.
According to the technical scheme, the electronic expansion valve comprises a valve seat, a guide sleeve, a connecting pipe and a welding ring, gaps are respectively formed between the valve seat and the guide sleeve and between the valve seat and the connecting pipe, and the welding ring is sleeved on the connecting pipe. The welding ring is sleeved on the connecting pipe outside the valve seat, and is in butt joint with the connecting pipe and the valve seat, so that the installation is convenient. The guide sleeve, the valve seat and the connecting pipe are welded together through the tunnel furnace, and when welding, the welding ring is melted, and the welding flux is filled between the valve seat and the connecting pipe and between the guide sleeve and the valve seat through capillary action, so that the guide sleeve, the valve seat and the connecting pipe are firmly welded. The electronic expansion valve provided by the invention can reduce the welding procedure of the electronic expansion valve for laser welding of the guide sleeve and the valve seat in the prior art, and only one welding ring is required to be arranged to solve the welding of 3 parts, thereby not only simplifying the welding procedure, but also reducing the cost.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present description and accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims (11)

1. An electronic expansion valve, characterized in that it comprises:
the valve seat is provided with a valve cavity and a side hole, and the side hole is communicated with the valve cavity;
the guide sleeve is arranged in the valve cavity, the axial direction of the guide sleeve comprises a matching section, and a first gap is formed between the matching section and the inner wall of the valve cavity;
the connecting pipe comprises an inserting section and an extending section, the inserting section penetrates through the side hole and forms a second gap with the inner wall of the side hole, and the second gap is communicated with the first gap; the extending section extends into the valve cavity;
and a welding ring filling the first gap and the second gap.
2. The electronic expansion valve of claim 1, wherein the first gap has a pitch of less than 0.2mm.
3. The electronic expansion valve of claim 2, wherein the second gap has a pitch of less than 0.2mm.
4. The electronic expansion valve of claim 1, wherein the guide sleeve further comprises a mating surface disposed on a bottom wall of the mating section and connected thereto, wherein a third gap is formed between the mating surface and the extension section, and wherein a spacing of the third gap is less than 0.2mm.
5. The electronic expansion valve of claim 4, wherein the mating surface is a planar or arcuate surface.
6. The electronic expansion valve of claim 4, wherein the length of the extension is 0.5mm or greater.
7. The electronic expansion valve of claim 4, wherein said guide sleeve further comprises a positioning segment in an axial direction, said mating segment being disposed between said positioning segment and said mating surface, said positioning segment being connected to said mating segment and abutting said valve cavity inner wall.
8. The electronic expansion valve of claim 7, wherein the guide sleeve has an outer diameter at the locating section that is greater than an outer diameter at the mating section.
9. The electronic expansion valve of claim 8, wherein said guide sleeve further comprises a guide section, said mating surface is disposed between said guide section and said positioning section, said guide section is connected to said mating surface, and an end surface of said extension section facing one end of said valve chamber abuts said guide section.
10. The electronic expansion valve of claim 9, wherein the nipple further comprises a body section and a reducing section, the body section having a diameter greater than the diameter of the insert section, the reducing section disposed between the body section and the insert section for connecting the body section and the insert section.
11. The electronic expansion valve of claim 10, wherein the weld ring is sleeved on the outer wall of the reducing section.
CN202310912492.0A 2022-06-16 2022-06-16 Electronic expansion valve Pending CN117249255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310912492.0A CN117249255A (en) 2022-06-16 2022-06-16 Electronic expansion valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202310912492.0A CN117249255A (en) 2022-06-16 2022-06-16 Electronic expansion valve
CN202210680573.8A CN117287510A (en) 2022-06-16 2022-06-16 Electronic expansion valve

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN202210680573.8A Division CN117287510A (en) 2022-06-16 2022-06-16 Electronic expansion valve

Publications (1)

Publication Number Publication Date
CN117249255A true CN117249255A (en) 2023-12-19

Family

ID=89157718

Family Applications (2)

Application Number Title Priority Date Filing Date
CN202210680573.8A Pending CN117287510A (en) 2022-06-16 2022-06-16 Electronic expansion valve
CN202310912492.0A Pending CN117249255A (en) 2022-06-16 2022-06-16 Electronic expansion valve

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN202210680573.8A Pending CN117287510A (en) 2022-06-16 2022-06-16 Electronic expansion valve

Country Status (2)

Country Link
CN (2) CN117287510A (en)
WO (1) WO2023241260A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100609018B1 (en) * 2004-08-10 2006-08-03 자화전자 주식회사 electronic expansion valve with seal-ring structure
CN107289685A (en) * 2016-04-12 2017-10-24 浙江三花智能控制股份有限公司 A kind of electric expansion valve and its valve component, the processing method of valve component
CN108506548B (en) * 2017-02-24 2022-03-08 浙江盾安机械有限公司 Electronic expansion valve
CN108692081A (en) * 2017-04-07 2018-10-23 浙江盾安机械有限公司 Electric expansion valve
CN109931408A (en) * 2017-12-18 2019-06-25 浙江盾安禾田金属有限公司 Electric expansion valve
CN216200565U (en) * 2021-09-30 2022-04-05 苏州华越金属有限公司 Electronic expansion valve
CN217502601U (en) * 2022-06-16 2022-09-27 广东威灵电机制造有限公司 Electronic expansion valve
CN217502603U (en) * 2022-06-16 2022-09-27 广东威灵电机制造有限公司 Electronic expansion valve

Also Published As

Publication number Publication date
WO2023241260A1 (en) 2023-12-21
CN117287510A (en) 2023-12-26

Similar Documents

Publication Publication Date Title
EP1865275A2 (en) Expansion valve
CN217502601U (en) Electronic expansion valve
CN217874276U (en) Electronic expansion valve and refrigeration equipment
CN217502603U (en) Electronic expansion valve
CN107061762B (en) Connecting structure and method for pilot valve and main valve body
CN117249255A (en) Electronic expansion valve
EP1500885B1 (en) Expansion valve
JP7349514B2 (en) electronic expansion valve
CN217539638U (en) Electronic expansion valve
CN217784253U (en) Electronic expansion valve and refrigeration equipment
CN217502604U (en) Electronic expansion valve
CN213954384U (en) Valve body assembly, electronic expansion valve and refrigeration equipment
CN217539637U (en) Electronic expansion valve
US20050062285A1 (en) Hydraulic port weld stud
CN215371029U (en) Electronic expansion valve and refrigeration equipment
CN219755350U (en) Solenoid valve, refrigeration plant and car
CN220566588U (en) Electronic expansion valve and refrigeration equipment
CN219140086U (en) Welded structure, connecting pipeline and oil-liquid separator
CN208348737U (en) Internal thread rubber hose coupling
CN217502602U (en) Electronic expansion valve
CN219755616U (en) Pipe fitting joint, filter and air conditioner
CN220366068U (en) Connecting pipe assembly
CN218625611U (en) Electronic expansion valve and refrigeration equipment
CN218817285U (en) Oil valve body of energy accumulator
CN219994468U (en) Multi-split air conditioning system and one-way valve thereof

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