CN217502602U

CN217502602U - Electronic expansion valve

Info

Publication number: CN217502602U
Application number: CN202221509734.9U
Authority: CN
Inventors: 陈超; 刘文金; 唐文博; 杨茂
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 utility model discloses an electronic expansion valve, which comprises a valve seat, a first connecting pipe and a welding flux; the valve seat is provided with a body part and a valve port part, and the valve port part is connected with one end of the body part; the valve opening part is sleeved at one end of the first connecting pipe, and the welding flux is arranged in the first connecting pipe and is positioned between the other end of the first connecting pipe and the valve opening part. The utility model discloses an electronic expansion valve, inconvenient problem in the time of quality inspection and management and control after can solving the disk seat and the takeover welding to electronic expansion valve.

Description

Electronic expansion valve

Technical Field

The utility model relates to the technical field of valves, in particular to electronic expansion valve.

Background

The electronic expansion valve is an important part in a refrigeration system and mainly plays roles in throttling, reducing pressure and regulating flow. The existing electronic expansion valve comprises a valve seat, a nut and a valve needle component matched with the nut through threads, and a driving device is used for driving the valve needle component to generate axial movement to adjust the opening degree of a valve port, so that circulation control is realized. Usually, can weld two takeovers on the disk seat, when the takeover of copper product and the disk seat welding of stainless steel material, because the expansion coefficient of copper product is greater than the expansion coefficient of stainless steel material, can form the gap after the junction heating of takeover and disk seat, need fill the gap department with the solder in order to carry out welded fastening with both.

However, when the butt joint pipe and the valve seat are welded at present, the welding flux is usually sleeved on the outer surface of the connecting pipe, so that the welding flux is welded and fixed in a gap through flowing from outside to inside after being heated and melted, and an operator cannot usually see whether the gap is filled after the welding flux is melted and how the filling effect is, so that the quality after welding is inconvenient to manually inspect and control.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electronic expansion valve, inconvenient problem when aiming at solving the quality inspection and the management and control to electronic expansion valve's disk seat and takeover welding back.

In order to achieve the above object, the present invention provides an electronic expansion valve, which comprises a valve seat, a first connecting pipe and a solder; the valve seat is provided with a body part and a valve port part, and the valve port part is connected with one end of the body part; the valve opening part is sleeved at one end of the first connecting pipe, and the welding flux is arranged in the first connecting pipe and is positioned between the other end of the first connecting pipe and the valve opening part.

In an embodiment, the first connection pipe includes a fitting section, a reducing section and a body section, the fitting section, the reducing section and the body section are sequentially connected, the valve port portion has a mounting surface extending in an axial direction of the valve seat, the fitting section is sleeved on the mounting surface, an inner diameter of the reducing section is gradually reduced along the fitting section in a direction toward the body section, and the solder is located in the body section and/or the reducing section.

In one embodiment, the mating segment and the mounting surface are a clearance fit.

In one embodiment, the valve seat is made of stainless steel, the first adapter is made of copper, and the matching section and the mounting surface are in transition fit.

In an embodiment, the solder abuts the valve port.

In one embodiment, the angle between the converging section and the axis of the valve seat is alpha, and 60 degrees alpha is larger than or equal to 30 degrees.

In one embodiment, the solder is annularly disposed.

In an embodiment, the electronic expansion valve further includes a valve needle assembly movably disposed on the valve seat to open or close a valve port of the valve port portion.

In an embodiment, the electronic expansion valve further includes a housing, and the housing is connected to an end of the body portion away from the valve port portion and forms a receiving cavity for receiving the valve needle assembly.

In an embodiment, the electronic expansion valve further includes a nut component and a rotor component disposed in the accommodating cavity, the rotor component is connected to the valve needle component, and the nut component is in threaded connection with the valve needle component.

The electronic expansion valve of the utility model comprises a valve seat, a first connecting pipe and a welding flux; the valve seat is provided with a body part and a valve port part, and the valve port part is connected with one end of the body part; the valve opening part is sleeved at one end of the first connecting pipe, and the welding flux is arranged in the first connecting pipe and is positioned between the other end of the first connecting pipe and the valve opening part. When welding first takeover and the valve port portion of disk seat, can form the gap after the junction heating of first takeover and disk seat, perhaps first takeover just has the gap with the junction itself of disk seat, the melting flows into in the gap and flows to the surface of disk seat for liquid solder after the heating for operating personnel naked eye can observe the solder condition of flowing out, so, make things convenient for artifical quality inspection and management and control to its welding back, judge whether the welding of first takeover and the valve port portion of disk seat is firm, and whether the welding point has the circumstances such as gap.

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 structural view of an embodiment of an electronic expansion valve according to the present invention;

FIG. 2 is a schematic view of a valve seat of the electronic expansion valve of FIG. 1;

fig. 3 is an enlarged view of a portion a in fig. 2.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Electronic expansion valve	220	Necking section
100	Valve seat	230	Body section
				110	Body part	300	Solder
120	Valve port	400	Valve needle assembly
				121	Mounting surface	500	Outer casing
122	Valve port	600	Containing cavity
				130	Connecting port	700	Nut component
140	Valve cavity	800	Rotor assembly
				200	First connecting pipe	900	Guide sleeve
201	Mounting position	910	Guide section
				210	Mating segment	1000	Second connecting pipe

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's embodiment, electronic expansion valve is an important part among the refrigerating system, mainly plays the effect of throttle step-down and regulation flow. The existing electronic expansion valve comprises a valve seat, a nut and a valve needle component matched with the nut through threads, and a driving device is used for driving the valve needle component to generate axial movement to adjust the opening degree of a valve port, so that circulation control is realized. The utility model discloses an electronic expansion valve, the required solder is placed inside first takeover when will butt joint pipe and disk seat weld together, and is close to the valve port department of disk seat, melts the back through the solder from the gap department between butt joint pipe and the disk seat, and the quality after the solder is come to the welding is examined and the management and control to the solder outflow condition, judges whether the gap between butt joint pipe and the disk seat is filled up by the solder.

The utility model discloses an electronic expansion valve can use in air conditioning system, and the fluid medium that flows through electronic expansion valve 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.

Referring to fig. 1 to 3, in an embodiment of the present invention, the electronic expansion valve 10 includes a valve seat 100, a first connection pipe 200 and a solder 300; the valve seat 100 has a body 110 and a valve port 120, and the valve port 120 is connected to one end of the body 110; one end of the first connection pipe 200 is sleeved on the valve port 120, and the solder 300 is disposed in the first connection pipe 200 and between the other end of the first connection pipe 200 and the valve port 120.

Specifically, the valve seat 100 is machined from a stainless steel material, and the valve seat 100 is disposed in a substantially cylindrical shape. It is understood that in other embodiments, the valve seat 100 may be made of other materials, not specifically illustrated, and the valve seat 100 may have other shapes than a cylinder. The valve seat 100 has a body 110 and a valve port 120, the valve port 120 is located at one end of the valve seat 100, and the valve port 120 further opens a valve port 122. The first connection pipe 200 is sleeved at the valve port 120, the electronic expansion valve 10 further includes a second connection pipe 1000, the valve seat 100 is provided with a connection port 130, the second connection pipe 1000 is connected to the connection port 130, a valve cavity 140 is formed in the valve seat 100, and the connection port 130 and the valve port 122 can be communicated through the valve cavity 140. Fluid medium may flow into the valve chamber 140 from either the connection port 130 or the valve port 122 and out the other port. In the present embodiment, the fluid medium flows into the electronic expansion valve 10 from the second connection pipe 1000, and flows out from the first connection pipe 200, i.e., flows into the valve chamber 140 from the connection port 130, and flows out through the valve port 122.

In this embodiment, the material of the valve seat 100 is a stainless steel material, and the material of the first adapter 200 is a copper material, but in other embodiments, the materials of the valve seat 100 and the first adapter 200 may be other materials, and this is not particularly limited. In general, when the first adapter tube 200 and the valve seat 100 are welded together, since the expansion coefficient of the copper material is greater than that of the stainless material, a gap is formed at the joint of the first adapter tube 200 and the valve seat 100 after heating, and therefore, it is necessary to make the melted solder 300 flow into the gap to fill the gap, and solidify after cooling, to serve to weld the first adapter tube 200 and the valve seat 100 together. Of course, in other embodiments, when the valve seat 100 and the first adapter tube 200 are made of other materials, a gap exists at the joint of the first adapter tube 200 and the valve seat 100 after the assembly is completed, and the melted solder 300 flows into the gap to fill the gap, and solidifies after cooling, and serves to weld the first adapter tube 200 and the valve seat 100 together.

Referring to fig. 1 to 3, the solder 300 is disposed in the first connection tube 200 and located between the other end of the first connection tube 200 and the valve port 120. Specifically, an installation position 201 is formed on the inner surface of the first adapter tube 200 close to the valve port 120, and solder 300 is placed on the installation position 201, when the first adapter tube 200 and the valve seat 100 are welded, the solder 300 melts and flows into a gap at the joint of the first adapter tube 200 and the valve seat 100, and flows out to the outer surface of the valve seat 100 along the gap, so that an operator can observe the gap with naked eyes, and the quality inspection and control after welding can be performed conveniently by manual work, and then after the solder 300 is cooled, the first adapter tube 200 and the valve seat 100 are welded together, and the whole welding process is completed.

The electronic expansion valve 10 of the present invention includes a valve seat 100, a first connecting pipe 200 and a solder 300; the valve seat 100 has a body 110 and a valve port 120, and the valve port 120 is connected to one end of the body 110; one end of the first connection pipe 200 is sleeved on the valve port 120, and the solder 300 is disposed in the first connection pipe 200 and between the other end of the first connection pipe 200 and the valve port 120. When the first connection pipe 200 is welded to the valve opening 120 of the valve seat 100, a gap is formed at the joint of the first connection pipe 200 and the valve seat 100 after heating, or a gap exists at the joint of the first connection pipe 200 and the valve seat 100 itself, and the solder 300 melted into a liquid state after heating flows into the gap and flows out to the outer surface of the valve seat 100, so that the solder 300 flowing out condition can be observed by naked eyes of an operator, and thus, the quality inspection and control after welding can be conveniently performed manually, and whether the welding of the first connection pipe 200 and the valve opening 120 of the valve seat 100 is stable or not is judged, and whether a gap exists in a welding point or not is judged.

Referring to fig. 1 to 3, in an embodiment, the first connection tube 200 includes a fitting section 210, a reducing section 220 and a body section 230, the fitting section 210, the reducing section 220 and the body section 230 are sequentially connected, the valve port 120 has a mounting surface 121 extending along an axial direction of the valve seat 100, the fitting section 210 is sleeved on the mounting surface 121, an inner diameter of the reducing section 220 is gradually reduced along the fitting section 210 toward the body section 230, and the solder 300 is located on the body section 230 and/or the reducing section 220.

Specifically, the fitting section 210 of the first adapter tube 200 is fitted on the mounting surface 121 and can be attached to the mounting surface 121, and the length of the fitting section 210 is longer than the extending length of the valve port 120, so as to provide a sufficient mounting space for mounting the solder 300. With the cooperation section 210 cover locate on the installation face 121, there is the gap between the internal wall face of cooperation section 210 and the installation face 121, when welding first takeover 200 and valve opening portion 120, when solder 300 melts the back, solder 300 can flow into in the gap and flow out to the surface of disk seat 100 for operating personnel naked eye can observe the solder 300 condition of flowing out, so, make things convenient for manual work to its welded quality inspection and management and control.

The inner diameter of the necking section 220 gradually decreases along the direction from the fitting section 210 to the body section 230, and when the inner diameter of the necking section 220 gradually decreases along the direction from the fitting section 210 to the body section 230, the solder 300 with a fixed size is clamped at the mounting position 201 and will not slide off along the inner wall of the first connecting pipe 200 or shift in position, thereby ensuring the welding effect of the first connecting pipe 200 and the valve port 120. Moreover, the inner diameter of the necking section 220 is gradually reduced and is obliquely arranged, so that the processing is convenient. The solder 300 may be located entirely within the body section 230, or may be located entirely within the neck section 220, or may be located partially within the body section 230 and partially within the neck section 220. The solder 300 abuts against the valve opening 120, so that the solder 300 is closest to the joint of the first adapter tube 200 and the valve seat 100, the welding effect is the best, and the loss of the solder 300 can be avoided.

Further, the mating segment 210 is clearance fit with the mounting surface 121. Specifically, since the solder 300 needs to flow out from the inner wall surface of the electronic expansion valve 10 to the outer wall surface of the electronic expansion valve 10 in order to facilitate the operator to visually observe the welding condition of the first adapter tube 200 and the valve seat 100, a gap should exist between the inner wall surface of the fitting section 210 and the mounting surface 121, i.e., a clearance fit between the fitting section 210 and the mounting surface 121. The clearance fit refers to a fit having a clearance (including a minimum clearance equal to zero), that is, a clearance exists between the fitting section 210 and the mounting surface 121, and it should be emphasized that the clearance between the fitting section 210 and the mounting surface 121 should not be too large to affect the welding effect between the first adapter 200 and the valve port portion 120.

In another embodiment, the valve seat 100 is made of stainless steel, the first adapter 200 is made of copper, and the fitting section 210 and the mounting surface 121 are in transition fit. In general, since the expansion coefficient of the copper material is greater than that of the stainless material, when the first adapter tube 200 and the valve seat 100 are welded together, a gap is formed at the joint of the first adapter tube 200 and the valve seat 100 after being heated, and therefore, it is necessary to make the melted solder 300 flow into the gap to fill the gap, and solidify after being cooled, so as to perform the function of welding the first adapter tube 200 and the valve seat 100 together. The transition fit refers to a fit which may have a clearance or an interference, and it is emphasized that the interference between the fitting section 210 and the mounting surface 121 should not be too large to affect the welding effect between the first adapter 200 and the valve port 120.

Referring to FIG. 2, in one embodiment, the inner diameter of the body section 230 is D1, the inner diameter of the mating section 210 is D2, and D2 is greater than or equal to D1. Specifically, in order to prevent the solder 300 from sliding off from the mounting position 201 along the inner wall of the first connection pipe 200 or from deviating from the position, the inner diameter of the fitting section 210 is greater than or equal to the inner diameter of the body section 230, so as to avoid the above problem from affecting the welding effect of the first connection pipe 200 and the valve port 120.

In one embodiment, the angle between the converging section 220 and the axis of the valve seat 100 is α, 60 ≧ α ≧ 30 °.

In one embodiment, the solder 300 is disposed in a ring shape. Specifically, the solder 300 is shaped in a circular ring. Of course, in other embodiments, the solder 300 may be provided in a block shape, and the solders 300 are arranged at intervals along the circumferential direction of the valve seat 100, or the solder 300 may also be provided in a sphere shape, and the solders 300 are arranged at intervals along the circumferential direction of the valve seat 100, and the shape of the solder 300 has various designs, as long as when the valve seat 100 and the first adapter 200 are welded, the solder 300 can sufficiently fill the gap between the inner wall surface of the first adapter 200 and the mounting surface 121, which is not particularly limited.

Further, the outer diameter of the welding ring is larger than the inner diameter of the first adapter tube 200. Specifically, the outer diameter of the welding ring is larger than the inner diameter of the first adapter tube 200, so that the welding ring can be prevented from sliding out of the tube of the first adapter tube 200 or sliding out of the mounting position 201 due to the fact that the diameter of the welding ring is too small, and the welding effect is not affected.

Referring to fig. 1, in an embodiment, the electronic expansion valve 10 further includes a valve needle assembly 400, and the valve needle assembly 400 is movably disposed on the valve seat 100 to open or close the valve port 122 of the valve port portion 120. Wherein, a guiding sleeve 900 is further disposed in the valve seat 100, the guiding sleeve 900 is fixedly mounted on the valve seat 100, and the guiding sleeve 900 is used for guiding the movement of the valve needle assembly 400. Specifically, the valve needle assembly 400 is movably disposed on the valve seat 100 and passes through the guide sleeve 900 to open or close the valve port 122, so that the first adapter 200 and the second adapter 1000 are communicated or blocked. The valve needle assembly 400 has a screw and a valve needle connected to the screw, the valve needle assembly 400 is mounted on the valve seat 100, and the valve needle passes through the guide section 910 to open or close the valve port 122. Further, the valve port 122 is communicated with the connection port 130, and the valve port 122 is used for the valve needle of the valve needle assembly 400 to extend into, so as to block the fluid medium in the electronic expansion valve 10 from being discharged out through the valve port 122. When the valve needle assembly 400 closes the valve port 122, that is, the connection port 130 is disconnected from the valve port 122, the electronic expansion valve 10 is closed, and the fluid medium cannot flow from the second connection pipe 1000 to the first connection pipe 200; when the valve needle assembly 400 releases the seal of the valve port 122, that is, the connection port 130 and the valve port 122 are communicated with each other, the electronic expansion valve 10 is opened, and the fluid medium can flow from the second connection pipe 1000 to the first connection pipe 200. The guide sleeve 900 may be integrally provided with the valve seat 100 or may be separately provided, which is not particularly limited.

With continued reference to fig. 1, in one embodiment, the guide sleeve 900 has a guide section 910, and the guide section 910 extends into the valve cavity 140 along the axial direction of the valve seat 100. Specifically, since the valve needle passes through the guiding section 910 and is located in the valve cavity 140, the valve needle needs to be moved frequently to open or close the valve port 122, and for better guiding effect, the guiding section 910 extends into the valve cavity 140 along the axial direction of the valve seat 100. Further, the outer surface of the guide section 910 extending into the valve cavity 140 has a cylindrical surface or a conical surface.

Referring to fig. 1, in an embodiment, the electronic expansion valve 10 further includes a housing 500, and the housing 500 is connected to an end of the valve seat 100 away from the valve cavity 140 and forms a receiving cavity 600 for receiving the valve needle assembly 400.

Specifically, the housing 500 is substantially cylindrical, a step surface is disposed at an end of the valve seat 100 away from the valve cavity 140, and an end of the housing 500 is sleeved on the valve seat 100 and is attached to the step surface. The housing 500 and the valve seat 100 may be fixed by welding. The housing 500 is connected with one end of the valve seat 100 far away from the valve cavity 140 and then encloses to form an accommodating cavity 600 for accommodating the valve needle assembly 400, and the valve needle assembly 400 is mounted on the valve seat 100 and is located in the accommodating cavity 600.

Referring to fig. 1, in an embodiment, the electronic expansion valve 10 further includes a nut assembly 700 and a rotor assembly 800 disposed in the accommodating chamber 600, the rotor assembly 800 is connected to the valve needle assembly 400, and the nut assembly 700 is in threaded connection with the valve needle assembly 400.

Specifically, the nut assembly 700 is fixedly connected to the valve seat 100, the nut assembly 700 has a nut, the nut is in threaded connection with the lead screw of the valve needle assembly 400, the rotor assembly 800 is fixedly connected to the lead screw, and the nut and the lead screw form a nut-lead screw fit relationship, so that the rotor assembly 800 rotates to drive the lead screw to rotate, and further the lead screw is made to perform telescopic motion along the axis direction thereof, thereby realizing a motion process that the lead screw drives the valve needle assembly 400.

The working principle of the electronic expansion valve 10 is as follows:

stator module generates magnetic field after the circular telegram, the rotor of being made by magnetic material rotates under the drive in magnetic field, rotor and lead screw fixed connection, the rotation of rotor drives the lead screw and rotates, form nut lead screw cooperation relation between lead screw and the nut, nut component 700 is fixed to be set up on disk seat 100, consequently the relative nut concertina movement of lead screw can be ordered about in the rotation of the relative nut of lead screw, thereby realize stator module drive rotor subassembly 800 motion, the working process of valve needle subassembly 400 motion is driven again to rotor subassembly 800.

The valve needle moves towards the valve port 122 under the driving of the screw rod, and when the valve needle closes the valve port 122, that is, the first interface part is disconnected from the second interface part, the electronic expansion valve 10 is closed; when the valve needle releases the sealing of the valve port 122, that is, the first interface part and the second interface part are communicated with each other, the electronic expansion valve 10 is opened, and the opening aperture of the valve port 122 in the electronic expansion valve 10 is relatively small, so that the flow rate of the fluid medium is reduced, and the process of throttling and depressurizing the fluid medium by the electronic expansion valve 10 is realized.

Referring to fig. 1, in an embodiment, an end of the valve seat 100 away from the valve cavity 140 is further provided with a connecting piece, and the connecting piece is fixedly engaged with the nut assembly 700. Specifically, the valve cavity 140 is further provided with a connecting piece for fixing the nut assembly 700, and the valve seat 100 is matched with the connecting piece to fix the nut assembly 700. The connecting piece is designed as a flat ring, and the nut component 700 can be fixed through the connecting piece. Further, the connecting piece is welded and fixed with the valve seat 100. The welding firmness is higher, and the stability is good.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, 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:

a valve seat having a body portion and a valve port portion connected to one end of the body portion;

one end of the first connecting pipe is sleeved with the valve opening part; and

and the solder is arranged in the first connecting pipe and is positioned between the other end of the first connecting pipe and the valve opening part.

2. The electronic expansion valve according to claim 1, wherein the first connection tube comprises a fitting section, a necking section, and a body section, the fitting section, the necking section, and the body section are sequentially connected, the valve port portion has a mounting surface extending in an axial direction of the valve seat, the fitting section is sleeved on the mounting surface, an inner diameter of the necking section is gradually reduced in a direction from the fitting section to the body section, and the solder is located in the body section and/or the necking section.

3. The electronic expansion valve of claim 2, wherein the mating segment and the mounting surface are a clearance fit.

4. The electronic expansion valve of claim 2, wherein the valve seat is made of stainless steel material, the first adapter is made of copper material, and the fitting section and the mounting surface are in transition fit.

5. The electronic expansion valve of claim 2, wherein the solder abuts the valve port.

6. An electronic expansion valve according to claim 2, wherein the angle between the converging section and the axis of the valve seat is α, 60 ° ≧ α ≧ 30 °.

7. An electronic expansion valve according to any of claims 1 to 6, wherein the solder is arranged in a ring.

8. The electronic expansion valve according to any of claims 1-6, further comprising a valve needle assembly movably disposed on the valve seat for opening or closing a valve port of the valve port portion.

9. The electronic expansion valve of claim 8, further comprising a housing coupled to an end of the body portion distal from the valve orifice portion and defining a receiving chamber for receiving the valve needle assembly.

10. The electronic expansion valve of claim 9, further comprising a nut assembly and a rotor assembly disposed in the receiving chamber, wherein the rotor assembly is coupled to the valve needle assembly, and wherein the nut assembly is threadably coupled to the valve needle assembly.