CN217502601U

CN217502601U - Electronic expansion valve

Info

Publication number: CN217502601U
Application number: CN202221509011.9U
Authority: CN
Inventors: 曾庆军; 陈超; 杨茂; 刘文金
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-09-27
Anticipated expiration: 2032-06-16

Abstract

The technical scheme of the utility model 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 and comprises a matching section in the axial direction, 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 is connected with the guide sleeve; the welding ring is sleeved with the connecting pipe and abutted against the outer wall of the valve seat, so that the welding ring flows to the second gap from the first gap after being melted and fills the first gap and the second gap. The utility model provides an electronic expansion valve, uide bushing and disk seat, takeover are crossed the tunnel furnace together, weld the ring and melt and fill up between disk seat and takeover and uide bushing and the disk seat for uide bushing, disk seat, takeover weld the jail, reducible electronic expansion valve process, and one weld the welding that the ring solved 3 parts, and are with low costs.

Description

Electronic expansion valve

Technical Field

The utility model relates to a solder control part technical field, in particular to 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 press-fitting and laser welding mode. Due to the limitation of the welding process, when the valve core seat and the valve body of the conventional electronic expansion valve are welded with each other, all parts need to be welded respectively, so that the process is complex, the operation steps are multiple, and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing an electronic expansion valve aims at reducing electronic expansion valve welding processes.

The utility model discloses technical scheme is through providing an electronic expansion valve, electronic expansion valve includes:

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 and comprises a matching section in the axial direction, and a first gap is formed between the matching section and the inner wall of the valve cavity;

the adapter tube comprises an insertion section and an extension section, the insertion 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 the welding ring is sleeved on the connecting pipe and abutted against the outer wall of the valve seat, so that the welding ring flows to the first gap from the second gap after being melted and fills the first gap and the second gap.

In one embodiment, the first gap has a pitch of less than 0.2 mm.

In one embodiment, the second gap has a pitch of less than 0.2 mm.

In an embodiment, the guide sleeve further comprises a matching surface, the matching surface is arranged on the bottom wall of the matching section and is connected with the matching section, a third gap is formed between the matching surface and the extending section, and the distance between the third gap and the extending section is smaller than 0.2 mm.

In one embodiment, the mating surface is a flat surface or an arc surface.

In one embodiment, the length of the protruding section is greater than or equal to 0.5 mm.

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 an embodiment, the guide sleeve has an outer diameter at the locating section which is larger 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, facing one end of the valve cavity, is abutted against the guide section.

In an embodiment, the adapter further comprises a main body section having a diameter larger than that of the insertion section, and a reducer section disposed between the main body section and the insertion section to connect the main body section and the insertion section.

In one embodiment, the weld ring is sleeved on the outer wall of the reducing section.

The technical scheme of the utility model through providing an electronic expansion valve, electronic expansion valve includes disk seat, uide bushing, takeover and welds the ring, and the disk seat is provided with valve pocket and side opening, and the uide bushing setting is in the valve pocket, and the takeover stretches into the valve pocket through the side opening. The uide bushing includes cooperation section, fitting surface and location section, location section and disk seat butt, and the cooperation section sets up in location section below, is formed with first clearance between cooperation section and the disk seat. The connecting pipe comprises an insertion section, the insertion section is arranged below the matching surface, and a second gap is formed between the insertion section and the inner wall of the side hole at the position of 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 the welding ring flows to the first gap from the second gap after being melted and fills the first gap and the second gap.

The technical scheme of the utility model provide an electronic expansion valve, the uide bushing crosses the tunnel furnace welding with disk seat, takeover together, welds the snare and establishes on the takeover outside the disk seat, welds ring and takeover and disk seat butt, simple to operate. During the welding, weld the ring and melt, fill up between disk seat and the takeover through the capillary action solder, and between uide bushing and the disk seat for uide bushing, disk seat, takeover weld the jail, the utility model provides a reducible electronic expansion valve process of electronic expansion valve (reduce the laser welding of uide bushing among the prior art and disk seat) to the welding of 3 parts is solved to a welding ring, and is with low costs.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of an electronic expansion valve;

FIG. 2 is a schematic structural view of a guide sleeve;

fig. 3 is an enlarged schematic view of a point a in fig. 1.

The reference numbers indicate:

reference numerals	Name (R)	Reference numerals	Name (R)
				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 surfaces
31	An extending section	24	Guide section
				32	Insertion section	51	First gap
33	Reducing section	52	Second gap
				34	Main body segment	53	Third gap

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "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 relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an electronic expansion valve is an important part in refrigerating system, mainly plays the effect of throttle step-down and regulation flow. 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 a thread, the valve needle assembly is provided with a lead screw, the lead screw is provided with a thread, the nut is in threaded connection with the thread, the rotor assembly is fixedly connected with the lead screw, 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 be close to or far away from the valve port so as to realize flow regulation. The technical scheme of the utility model the electronic expansion valve that provides, the uide bushing crosses the tunnel furnace welding with disk seat, takeover together, welds the loop cover and establishes on the takeover outside the disk seat, welds ring and takeover and disk seat butt, simple to operate. During the welding, weld the ring and melt, fill up between disk seat and the takeover through the capillary action solder, and between uide bushing and the disk seat for uide bushing, disk seat, takeover weld the jail, the utility model provides a reducible electronic expansion valve process of electronic expansion valve (reduce the laser welding of uide bushing among the prior art and disk seat) to the welding of 3 parts is solved to a welding ring, and is with low costs.

The utility model provides an electronic expansion valve crosses the product after the tunnel furnace welding, can use air conditioning system in, and the fluid medium of the electronic expansion valve of flowing through is the refrigerant that is used for carrying out the cold and heat exchange among 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 boundary 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 drier and other devices is throttled and depressurized, the dosage of the liquid refrigerant entering the evaporator is adjusted and controlled, and the dosage of the liquid refrigerant can meet the requirement of the external refrigeration load. Alternatively, the electronic expansion valve is applied to other types of refrigeration equipment, the fluid medium flowing through the electronic expansion valve may also be other fluid media except for the refrigerant, as long as the electronic expansion valve can throttle and depressurize the fluid medium, which is not particularly limited.

The welding flux mentioned in the utility model refers to a fluid welding material after the welding ring is melted when the guide sleeve, the valve seat and the connecting pipe are welded together in the tunnel furnace. The solder is in a fluid state and can flow among the valve seat, the connecting pipe and the guide sleeve 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 provides an electronic expansion valve 01, wherein the electronic expansion valve 01 includes a valve seat 10, a guide sleeve 20, a connecting pipe 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, 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 cavity 11; the weld ring 40 sleeves the nipple 30 and abuts the outer wall of the valve seat 10 such that the weld ring 40, after melting, flows from the second gap 52 to the first gap 51 and fills the first and

second gaps

51, 52.

Specifically, the valve seat 10 is manufactured by machining a stainless steel material, and the valve seat 10 is substantially cylindrically disposed. It is understood that in other embodiments, the valve seat 10 may be made of other materials, and that the valve seat 10 may have other shapes than a cylinder. A valve cavity 11 is arranged in the valve seat 10, a side hole 12 is arranged on the side wall of the valve seat 10, and the side hole 12 is communicated with the valve cavity 11. A guide sleeve 20 is fixedly mounted in the valve chamber 11, and the guide sleeve 20 guides the movement of the valve needle assembly. The guide sleeve 20 comprises a matching section 22 in the axial direction, the outer wall of the guide sleeve 20 is in clearance fit with the inner wall of the valve cavity 11 at the matching section 22, and a first clearance 51 is formed between the matching section 22 and the inner wall of the valve cavity 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 fitting section 22 in the axial direction. The adapter tube 30 comprises an insertion section 32 and an extension section 31, the outer diameter of the insertion section 32 and the outer diameter of the extension section 31 are both 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 cavity 11. The part of the adapter tube 30 penetrating into the side hole 12 is an insertion section 32, and the part of the adapter tube 30 extending into the valve cavity 11 is an extension 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 along the inner wall of the side hole 12 in the circumferential direction and has a cylindrical shape. 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 is communicated with the first gap 51, and the solder can flow from the first gap 51 to the second gap 52 and can also flow 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 opening at the branch of the flow paths of the first gap 51 and the second gap 52, and solder is prevented from flowing out from the extending section 31 and the guide sleeve 20 in the process of flowing from the second gap 52 to the first gap 51, so that the solder cannot fill the first gap 51. The weld ring 40 sleeves the nipple 30 and abuts the outer wall of the valve seat 10 such that the weld ring 40, after melting, flows from the second gap 52 to the first gap 51 and fills the first and

second gaps

51, 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 against 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 in 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 being melted and can flow. Due to capillary action, solder can flow into the valve chamber 11 through the second gap 52, 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 sleeve 20, and the adapter 30 are welded together.

The technical scheme of the utility model through providing an electronic expansion valve 01, electronic expansion valve 01 includes disk seat 10, uide bushing 20, takeover 30 and welds ring 40, is formed with the clearance respectively between disk seat 10 and the uide bushing 20, between disk seat 10 and the takeover 30, welds ring 40 and cup joints on takeover 30. The welding ring 40 is sleeved on the connecting pipe 30 outside the valve seat 10, and the welding ring 40 is abutted against 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 a tunnel furnace, during welding, the welding ring 40 is melted, and solder is filled between the valve seat 10 and the connecting pipe 30 and between the guide sleeve 20 and the valve seat 10 through capillary action, so that the guide sleeve 20, the valve seat 10 and the connecting pipe 30 are firmly welded. The utility model provides an electronic expansion valve 01 can reduce the electronic expansion valve 01's of uide bushing 20 among the prior art and disk seat 10 laser welding process to only need one installation to weld the welding that ring 40 just solved 3 parts, not only simplified welding process, still the cost is reduced.

In one embodiment, the first gap 51 has a pitch of less than 0.2 mm. Referring to fig. 1 and 3, in the electronic expansion valve 01 according to the present invention, gaps are respectively disposed between the valve seat 10 and the guide sleeve 20 and between the valve seat 10 and the connection pipe 30, and due to capillary action, the melted solder flows along the gaps between the valve seat 10 and the guide sleeve 20 and between the valve seat 10 and the connection pipe 30, and fills the first gap 51 and the second gap 52. Capillary action is also called capillary phenomenon, and when a thin tube is inserted into a liquid, the liquid rises or falls in the thin tube, and the phenomenon generated on the three-phase interface of solid, liquid and gas is the capillary phenomenon. The height of the rise and fall of the liquid in the capillary phenomenon can be determined by the following formula: h is 2 γ cos θ/(ρ gr). Wherein γ is surface tension; theta is a contact angle; ρ is the liquid density; g is the acceleration of gravity; r is the tubule radius. 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 tubules. In the utility modelIn the new proposed electronic expansion valve 01, the extent of solder flow and the amount of filling the first gap 51 and the second gap 52 are related to the distance between the first gap 51 and the second gap 52. A first gap 51 is formed between the fitting section 22 and the inner wall of the valve cavity 11, and the distance between the first gap 51 and the valve cavity 11 is L ₁ ，0＜L ₁ Is less than 0.2 mm. It will be appreciated that the mating section 22 is clearance fit with the inner wall of the valve chamber 11, so that the first clearance 51 is greater than 0 apart. When the pitch of the first gap 51 is greater than 0.2mm, the capillary action is not significant, which may result in that solder cannot flow from the second gap 52 to the first gap 51, and the first gap 51 is 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 pitch of the first gaps 51 is less than 0.2 mm. The spacing of the first gaps 51 may be any value between 0-0.2mm, e.g., the spacing of the first gaps 51 may be 0.01mm, may be 0.15mm, may be 0.18mm, etc.

In one embodiment, the pitch of the second gap 52 is less than 0.2 mm. Referring to fig. 1 and 3, in the above embodiment, the melted 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 due to the capillary action, and fills the first gap 51 and the second gap 52. The extent of solder flow and how much of the first and

second gaps

51, 52 are filled is related to the spacing of the first and

second gaps

51, 52. The insertion section 32 and the inner wall of the side hole 12 form a second gap 52, and the distance between the second gap 52 and the inner wall of the side hole 12 is L ₂ ，0＜L ₂ Less than 0.2 mm. It will be appreciated that the insertion section 32 has a clearance fit with the inner wall of the lateral hole 12, so that the spacing of the second clearance 52 is greater than 0. When the distance between the second gaps 52 is greater than 0.2mm, on the one hand, the capillary action may be insignificant, and solder may not flow from the second gaps 52 to the first gaps 51, and the first gaps 51 are filled with little or no solder, so that the soldering between the valve seat 10 and the guide sleeve 20 is weak or even impossible. On the other hand, if the distance between the second gaps 52 is too large, the solder required to fill the second gaps 52 increases, which may result in insufficient solder flowing to the first gaps 51, resulting in weak or even impossible soldering between the valve seat 10 and the guide sleeve 20. The pitch of the second gap 52 is less than 0.2 mm. The pitch of the second gap 52 may be any of 0-0.2mmThe value, 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 pitch of the first gap 51 and the pitch of the second gap 52 may be the same, for example, when the pitch of the first gap 51 is 0.12mm, the pitch of the second gap 52 is also 0.12 mm. 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, and so on. And are not intended to be limiting herein.

In one embodiment, the guide sleeve 20 further includes a mating surface 23, 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, a third gap 53 is formed between the mating surface 23 and the extending section 31, and a distance between the third gap 53 and the third gap is less than 0.2 mm. Referring to fig. 1 to fig. 3, the matching surface 23 is disposed on the bottom wall of the matching section 22, the matching surface 23 is connected to the matching section 22, the matching surface 23 is in clearance fit with the extending section 31, and a third clearance 53 is formed between the matching surface 23 and the extending section 31. The melted solder flows from the second gap 52 to the place where the first gap 51 communicates with the second gap 52, and a part of the solder flows to the first gap 51 by 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 bush 20 and the adapter tube 30 are welded together. A third gap 53 is formed between the mating surface 23 and the protruding section 31, and the third gap 53 has a distance L ₃ ，0＜L ₃ Less than 0.2 mm. It will be appreciated that the protruding section 31 is clearance fitted to the mating surface 23, so that the third clearance 53 has a spacing greater than 0. When the distance between the third gaps 53 is greater than 0.2mm, on the one hand, the capillary action may be insignificant, and the solder may not fill or fill the third gaps 53 uniformly, so that the connection between the adapter tube 30 and the guide sleeve 20 is weak or even impossible. On the other hand, if the third gap 53 is too large, the solder required to fill the third gap 53 increases, which may result in insufficient solder flowing to the first gap 51, and the welding between the valve seat 10 and the guide sleeve 20 is weak or even impossible. The pitch of the third gap 53 is less than 0.2 mm. The pitch of the second gap 52 may be any value between 0-0.2mm, e.g., the pitch of the second gap 52 may be 0.02mm, and may be 0.9mm, and may be 0.16mm, etc. In other embodiments, the pitch of the third gap 53, the pitch of the first gap 51, and the pitch of the second gap 52 may be the same or different, and are not limited herein.

In another embodiment, the mating surface 23 and the protruding section 31 may be an interference fit, and only a passage is required to be left at the communication between the first gap 51 and the second gap 52 so that the solder can 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 is welded to the valve seat 10 and the valve seat 10 is welded to the adapter 30, while the mating surface 23 is in interference fit with the protruding section 31, and the guide sleeve 20 can be tightly connected to the valve seat 10 and the adapter 30.

In one embodiment, the mating surface 23 is a flat surface or an arcuate surface. Referring to fig. 2, the mating surface 23 may be a plane or an arc surface. When the mating face 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 curved surface, the pitch of the third gap 53 gradually decreases in the direction from the first gap 51 to the third gap 53. The engagement face 23 may also be both a plane and an arc, such as the engagement face 23 being arc-shaped where the first gap 51 communicates with the second gap 52, the pitch thereof gradually decreasing in the direction from the first gap 51 to the third gap 53; the mating face 23 is planar at the rest of the position, and its spacing is equal everywhere in the direction from the first gap 51 to the third gap 53.

In one embodiment, the length of the protruding section 31 is equal to or greater than 0.5 mm. Referring to fig. 1 and 3, the extending section 31 is a portion of the connecting 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. One is that the first gap 51 and the second gap 52 are communicated to function as a guide and a communication, so that the solder can smoothly flow from the second gap 52 to the first gap 51, and the solder is prevented from being cut off at the communication position of the first gap 51 and the second gap 52. Secondly, the extending section 31 and the matching surface 23 are in clearance fit to form a third gap 53, and solder fills the third gap 53 to weld the guide sleeve 20 and the connecting pipe 30 together, so that the electronic expansion valve 01 has a more compact and stable structure. The length of the protruding section 31 is not too short, and in this embodiment, the length of the protruding section 31 is 0.5mm or more. Not only is the solder flow cutoff at the position where the first gap 51 and the second gap 52 are communicated avoided, but also the solder is fully filled at the third gap 53, and the guide sleeve 20 and the adapter 30 are firmly welded.

In an embodiment, the guiding sleeve 20 further includes a positioning section 21 in the axial direction, the matching section 22 is disposed between the positioning section 21 and the matching surface 23, and the positioning section 21 is connected to the matching 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 matching section 22 and a matching 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 where the guide sleeve 20 is connected to the valve seat 10. The positioning section 21 is connected with the matching section 22, and after the position where the positioning section 21 is abutted 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 an outer diameter at the positioning section 21 that is larger than an outer diameter 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 fitting 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 fluctuation, which makes the processing difficult and is inconvenient for production and manufacture. The outer diameter of the guide sleeve 20 at the positioning section 21 is larger than that at the fitting section 22, and the portion of the outer diameter of the guide sleeve 20 at the positioning section 21 is larger than that at the fitting section 22 by the distance of the first gap 51. The inner wall of the valve cavity 11 is flat, and the processing and the manufacturing are convenient. As can be seen from the above embodiment, the distance between the first gaps 51 is less 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 fitting section 22 is less than 0.2 mm.

In one embodiment, the guiding sleeve 20 further comprises a guiding section 24, the mating surface 23 is disposed between the guiding section 24 and the positioning section 21, the guiding section 24 is connected with the mating surface 23, and the end surface of the extending section 31 facing one end of the valve cavity 11 abuts against the guiding section 24. Referring to fig. 2 and 3, the guiding sleeve 20 further includes a guiding section 24, and the guiding section 24 guides the movement of the valve needle assembly. In the direction from the first gap 51 to the third gap 53, the guide sleeve 20 sequentially comprises a positioning section 21, a matching section 22, a matching surface 23 and a guide section 24, the guide section 24 is connected with the matching surface 23, and the guide section 24 abuts against the end surface of the extending section 31 facing one end of the valve cavity 11. The guide section 24 abuts against the extending section 31, so that on one hand, the parts are not easy to loosen and shake, 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 the guide section 24 abuts against the end surface of the extending section 31, so that the solder is prevented from flowing away from the end surface of the extending section 31, and sufficient solder can flow to the first gap 51.

In one embodiment, the adapter tube 30 further comprises a main body section 34 and a reducer section 33, the main body section 34 having a diameter larger than that of the insertion section 32, the reducer section 33 being disposed between the main body section 34 and the insertion section 32 to connect the main body section 34 and the insertion section 32. Referring to fig. 1, the utility model provides an electronic expansion valve 01 passes through the product after the tunnel furnace welding, can use among the air conditioning system for adjust and control the dosage of the liquid refrigerant that gets into in the evaporimeter, make the dosage of liquid refrigerant can adapt to external refrigeration load's requirement. The connection tube 30 further includes a main body section 34, and the main body section 34 is used for allowing the liquid refrigerant to flow into the electronic expansion valve 01 or allowing the liquid refrigerant to flow out of the electronic expansion valve 01. The main body section 34 has a larger diameter than the insertion section 32, and a reducer section 33 is present 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. In the direction from the main body section 34 to the insertion section 32, the diameter of the reducing section 33 gradually decreases from the same diameter as the main body section 34 to the same diameter as the insertion section 32. The tapered section 33 forms a slope at the junction of the main section 34 and the insertion section 32.

In one embodiment, the weld ring 40 is disposed on the outer wall of the reducer 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 connection between 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 welding ring 40 is not easy to slide in the length direction of the adapter 30, and when the valve seat 10, the adapter 30 and the guide sleeve 20 are welded together in a tunnel furnace, the welding ring 40 is melted and then directly flows into the valve cavity 11 from the second gap 52, and then flows into the first gap 51 and the third gap 53. The situations of solder loss and insufficient solder filling are greatly avoided.

The technical scheme of the utility model through providing an electronic expansion valve, electronic expansion valve includes disk seat, uide bushing, takeover and welds the ring, is formed with the clearance respectively between disk seat and the uide bushing, disk seat and the takeover, welds the ring and cup joints on the takeover. The welding ring is sleeved on the connecting pipe outside the valve seat, and the welding ring is abutted against 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 a tunnel furnace, the welding ring is melted during welding, 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 utility model provides an electronic expansion valve can reduce the uide bushing among the prior art and the welding process of the laser welding's of disk seat electronic expansion valve to only need one installation to weld the welding that the ring just solved 3 parts, not only simplified welding process, still the cost is reduced.

The above is only the optional embodiment of the present invention, and not therefore the limit to the patent scope of the present invention, all the concepts of the present invention utilize the equivalent structure transformation of the content of the specification and the attached drawings, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

2. The electronic expansion valve of claim 1, wherein the first gap has a pitch of less than 0.2 mm.

3. The electronic expansion valve of claim 2, wherein the second gap has a pitch of less than 0.2 mm.

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, the mating surface connecting the mating section, and a third gap formed between the mating surface and the protruding section, wherein a distance between the third gap and the protruding section is less than 0.2 mm.

5. The electronic expansion valve of claim 4, wherein the mating surface is a flat surface or an arc surface.

6. The electronic expansion valve of claim 4, wherein the length of the inlet section is 0.5mm or greater.

7. The electronic expansion valve of claim 4, further comprising a positioning section in the axial direction of the guide sleeve, wherein the fitting section is disposed between the positioning section and the fitting surface, and the positioning section is connected to the fitting section and abuts against the inner wall of the valve chamber.

8. The electronic expansion valve of claim 7, wherein the guide sleeve has an outer diameter at the positioning section that is greater than an outer diameter at the engagement section.

9. The electronic expansion valve of claim 8, wherein the guide sleeve further comprises a guide section, the mating surface is disposed between the guide section and the positioning section, the guide section is connected to the mating surface, and an end surface of the extending section facing one end of the valve chamber abuts against the guide section.

10. The electronic expansion valve of claim 9, wherein the adapter further comprises a main body section having a diameter larger than that of the insertion section, and a reducer section disposed between the main body section and the insertion section for connecting the main body section and the insertion section.

11. The electronic expansion valve of claim 10, wherein the weld ring is disposed around an outer wall of the reducer section.