Electronic expansion valve and valve seat processing method

Abstract

A method for processing an electronic expansion valve and a valve seat (2), comprising: a valve seat (2), a housing (1) and a coil (94), wherein the valve seat (2) comprises a first connecting portion (23) and a second connecting portion (24), the second connecting portion (24) is integrally formed with the first connecting portion (23), the housing (1) is connected to the first connecting portion (23), and the coil (94) is fitted onto an outer periphery of the housing (1) and connected to the second connecting portion (24). By forming the first connection part (23) for connecting the housing (1) and the second connection part (24) for connecting the coil (94) as an integral structure, it is possible to ensure coaxiality when the first connection part (23) and the second connection part (24) are integrally processed, and further, it is possible to ensure coaxiality after assembly of the coil (94) and the valve seat (2), and based on the ensured coaxiality, it is possible to more stably connect the coil (94), the housing (1), and the valve seat (2). The strength of the connection between the first connection part (23) and the second connection part (24) is also ensured.

Description

[Technical field]

[0001] Related Applications This disclosure claims priority to a Chinese patent application filed on January 28, 2022, bearing application number 202210106063.X and entitled "Method for Processing Electronic Expansion Valve and Valve Seat," the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of cooling systems, and in particular to an electronic expansion valve and a processing method for a valve seat. [Background technology]

[0003] With the spread of inverter air conditioners, the electronic expansion valve, as a main component of inverter air conditioners, has a significant impact on the comfort and energy saving of air conditioners. However, the electronic expansion valve in the related art has an unstable connection between the coil and the valve seat, so the coil is prone to rattling. Summary of the Invention

[0004] The embodiments of the present disclosure provide a processing method for an electronic expansion valve and a valve seat to solve the problem of coil instability existing in the related art.

[0005] The electronic expansion valve of the embodiment of the present disclosure includes a valve seat, a housing and a coil, the valve seat includes a first connecting portion and a second connecting portion, the second connecting portion is integrally molded with the first connecting portion, the housing is connected to the first connecting portion, and the coil is fitted to the outer periphery of the housing and connected to the second connecting portion.

[0006] A processing method for a valve seat of an electronic expansion valve in an embodiment of the present disclosure includes integrally processing and forming a blank for the valve seat, forming a connecting outer peripheral surface on a first connecting portion and forming a valve port on a valve core portion, wherein the blank includes a first connecting portion, a second connecting portion and a valve core portion, the first connecting portion is used for connecting to a housing of the electronic expansion valve, the second connecting portion is used for connecting to a coil of the electronic expansion valve, and the connecting outer peripheral surface is used for connecting to the housing.

[0007] A processing method for a valve seat of an electronic expansion valve in an embodiment of the present disclosure includes integrally processing and molding a first connecting part and a second connecting part of the valve seat, molding a connecting outer peripheral surface on the first connecting part, molding a valve core part having a valve port, and assembling the valve core part and the first connecting part, wherein the first connecting part is used for connecting to a housing of the electronic expansion valve, and the second connecting part is used for connecting to a coil of the electronic expansion valve.

[0008] An embodiment of the above-described invention has at least the following advantages or beneficial effects. In the electronic expansion valve of the embodiment of the present disclosure, compared to the related art in which the part connected to the coil and the part connected to the housing are separate structures, the first connection part for connecting the housing and the second connection part for connecting the coil are integrally molded, thereby ensuring coaxiality when the first connection part and the second connection part are integrally processed, and further ensuring coaxiality after assembly of the coil and the valve seat, and based on the assured coaxiality, making it possible to more stabilize the connection between the coil, the housing, and the valve seat. Furthermore, the integral structure of the first connection part and the second connection part also ensures the connection strength between them. [Brief description of the drawings]

[0009] [Figure 1] 1 shows a cross-sectional view of an electronic expansion valve according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 shows a perspective view of a valve seat according to a first embodiment of the present disclosure. [Diagram 3] 1 shows a cross-sectional view of a valve seat according to a first embodiment of the present disclosure. [Figure 4] FIG. 2 shows a perspective view of a valve seat of a second embodiment of the electronic expansion valve of the first embodiment of the present disclosure. [Diagram 5] FIG. 2 shows a cross-sectional view of an electronic expansion valve according to a second embodiment of the present disclosure. [Figure 6] FIG. 13 shows a perspective view of a first connection portion and a second connection portion of an electronic expansion valve according to a second embodiment of the present disclosure. [Figure 7]FIG. 13 shows a cross-sectional view of a first connection portion and a second connection portion of an electronic expansion valve according to a second embodiment of the present disclosure. [Figure 8] 4A-4D are cross-sectional views of different molding processes of the valve seat of the first embodiment of the present disclosure; [Figure 9] 4A-4D are cross-sectional views of different molding processes of the valve seat of the first embodiment of the present disclosure;

[0010] Here, the symbols in the drawings are explained as follows. 1. Housing 13. Chamber 2 Valve seat 21 Valve Orifice 22 Recess 221 Bottom 222 Side 23 First connection part 231 Straight tube segment 232 Protruding segment 234 Connection outer surface 235 connection segments 236 Horizontal hole 24 Second connection part 241 Connection structure 25 Through hole 26 Valve core 261 Sleeve section 3 Nut seat 4 Screw 41 Storage Groove 42 Moving Sleeve 421 Flange 43 End Cap 44 Fastening member 45 Containment Room 5 Spindle 6 Magnetic rotor 7 Stop Assembly 71 Wrapped Pillar 72 Spring guide rail 73 Retaining ring 74 Connection parts 75 Second stopper 76 First stopper 81 Elastic member 82 Balancing Passage 83 Intermediate parts 91 First connecting pipe 92 Second connecting pipe 93 Restriction Members 94 Coil 941 Leaf spring DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Now, the exemplary embodiments will be described more fully with reference to the drawings. However, the exemplary embodiments can be implemented in various forms and should not be understood to be limited to the embodiments described herein. On the contrary, by providing these embodiments, the present disclosure will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings indicate the same or similar configurations, and therefore detailed descriptions thereof will be omitted.

[0012] As shown in Fig. 1, a cross-sectional view of an electronic expansion valve according to an embodiment of the present invention is shown. The electronic expansion valve according to the embodiment of the present invention includes a housing 1, a coil 94, a valve seat 2, a nut seat 3, a screw 4, a spindle 5 and a magnetic rotor 6.

[0013] It will be understood that the terms "comprise" and "have" in the embodiments of the invention, and any variations thereof, are intended to include a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may further include steps or units that are not listed, or may further include other steps or assemblies inherent to the process, method, product, or apparatus.

[0014] The valve seat 2 is connected to the housing 1 and forms a chamber 13 together with the housing 1. The valve seat 2 has a valve port 21 and a recess 22 provided corresponding to the valve port 21. The coil 94 is provided on the outer periphery of the housing 1.

[0015] The nut seat 3 is provided in the chamber 13 and is provided in the recess 22. The screw 4 is provided in the chamber 13 and is screwed into the nut seat 3. The spindle 5 is connected to the screw 4 and is used to engage with the valve port 21 to adjust the opening degree of the valve port 21. The magnetic rotor 6 is provided in the chamber 13 and is inductively connected to the coil 94 and connected to the screw 4.

[0016] When the coil 94 is energized, the magnetic rotor 6 can rotate around its own axis, thereby moving and rotating the screw 4 in synchronous with it. When the screw 4 and the nut seat 3 rotate relatively due to the threaded structure, the screw 4 moves axially relative to the nut seat 3, and further, the spindle 5 is moved to move along the axial direction, thereby adjusting the opening degree of the valve port 21.

[0017] The valve seat 2 is also connected to a first connecting pipe 91 and a second connecting pipe 92. The valve port 21 of the valve seat 2 is provided between the first connecting pipe 91 and the second connecting pipe 92. When the spindle 5 seals the valve port 21, the first connecting pipe 91 and the second connecting pipe 92 are not electrically connected to each other. When the spindle 5 does not seal the valve port 21, the first connecting pipe 91 and the second connecting pipe 92 are electrically connected to each other.

[0018] In one embodiment, the valve seat 2 may be a metallic member.

[0019] The nut seat 3 further includes a balancing passage 82 which passes through the inner and outer circumferential surfaces of the nut seat 3 .

[0020] By providing the equalization passage 82, the space within the valve seat 2 can be connected to the chamber 13, and the spindle 5 is not subjected to resistance due to an imbalance in air pressure during its axial movement.

[0021] The screw 4 further includes an accommodating groove 41. The electronic expansion valve further includes an elastic member 81, which is disposed in the accommodating groove 41, with one end abutting against the groove bottom of the accommodating groove 41 and the other end abutting against the spindle 5, so that the spindle 5 has a tendency to move away from the screw 4. One end of the spindle 5 is limited within the accommodating groove 41.

[0022] By providing an elastic member 81 between the screw 4 and the spindle 5, the contact between the spindle 5 and the screw 4 can be soft, not hard. When the screw 4 moves the spindle 5 to seal the valve port 21, the action of the elastic member 81 causes the spindle 5 to compress the elastic member 81 without continuing to move downward in the process of the screw 4 continuing to move downward, thereby preventing the spindle 5 from being locked in the valve port 21 and also preventing the screw 4 from being screwed into the nut seat 3 and locked. As a result, when moving in the opposite direction, the screw 4 and the nut seat 3 can still rotate easily, and the spindle 5 can be moved upward to open the valve port 21.

[0023] In one embodiment, the elastic member 81 is, but is not limited to, a compression spring.

[0024] In one embodiment, the electronic expansion valve further includes a restricting member 93, which is disposed on the groove wall of the accommodating groove 41 and adjacent to the groove mouth of the accommodating groove 41. One end of the spindle 5 is provided with a flange, which is engaged with the restricting member 93 to confine the flanged end of the spindle 5 within the accommodating groove 41, and prevent the spindle 5 from falling out of the accommodating groove 41.

[0025] For example, the restricting member 93 may be sleeve-shaped, with its outer wall surface connected to the groove wall of the accommodating groove 41 and fitted onto the outer periphery of the spindle 5 .

[0026] The electronic expansion valve of the embodiment of the present invention further includes a stop assembly 7, which is disposed in the chamber 13 and connected to the seal cover 12, and is used to limit the movement range of the screw 4 along the axial direction.

[0027] The stopper assembly 7 includes a winding post 71, a spring guide rail 72, a retaining ring 73, and a connecting member 74. One end of the winding post 71 is connected to the inner wall surface of the upper wall of the housing 1, and extends along the axial direction. The spring guide rail 72 is spirally wound around the outer periphery of the winding post 71, and a first retaining portion 76 and a second retaining portion 75 are respectively present at both ends of the spring guide rail 72. The connecting member 74 is connected to the screw 4. The retaining ring 73 abuts against the connecting member 74, and is spirally wound around the outer periphery of the winding post 71. At the same time, the retaining ring 73 can spirally move within the spiral groove formed by the spring guide rail 72.

[0028] When the screw 4 rotates around its own axis, the retaining ring 73 rotates along the spiral groove of the spring guide rail 72. When the retaining ring 73 comes into contact with the first stop portion 76 in the process of the screw 4 moving toward the seal cover 12, it indicates that the screw 4 has moved to the upper limit point, in which case the screw 4 cannot continue moving upward. When the retaining ring 73 comes into contact with the second stop portion 75 in the process of the screw 4 moving away from the seal cover 12, it indicates that the screw 4 has moved to the lower limit point, in which case the screw 4 cannot continue moving downward.

[0029] As shown in Figures 2 and 3, Figure 2 shows a perspective view of the valve seat 2 of the first embodiment of the present disclosure. Figure 3 shows a cross-sectional view of the valve seat 2 of the first embodiment of the present disclosure. The valve seat 2 of the embodiment of the present disclosure includes a first connecting portion 23 and a second connecting portion 24, and the second connecting portion 24 is molded integrally with the first connecting portion 23.

[0030] The first connection portion 23 is connected to the housing 1, and may be connected by, for example, but is not limited to, laser welding. The second connection portion 24 is connected to the coil 94, and may be connected by, for example, but is not limited to, locking.

[0031] In the electronic expansion valve of the embodiment of the present disclosure, compared to the related art in which the part connected to the coil and the part connected to the housing are separate structures, the first connection part 23 for connecting the housing 1 and the second connection part 24 for connecting the coil are integrally formed, thereby ensuring coaxiality when the first connection part 23 and the second connection part 24 are integrally processed, and further ensuring coaxiality after assembly of the coil and the valve seat 2, and based on the assured coaxiality, making it possible to more stabilize the connection between the coil, the housing 1, and the valve seat 2. In addition, the strength of the connection between the first connection part 23 and the second connection part 24 is ensured by making them integrally formed.

[0032] The first connection portion 23 has a tubular structure, and the second connection portion 24 is provided on the outer circumferential surface of the first connection portion 23 and extends outward in the radial direction.

[0033] It is to be understood that the "cylindrical structure" should be understood to mean not only a straight cylindrical shape, but also a cylindrical shape whose outer circumferential surface has a stepped structure.

[0034] The second connection portion 24 may be in the form of a single ring, and may surround the outer circumferential surface of the first connection portion 23 along the circumferential direction of the first connection portion 23.

[0035] 1 and 2, the second connecting portion 24 includes a connecting structure 241, which is used to lock onto the leaf spring 941 of the coil 94. The number of the connecting structures 241 may be plural.

[0036] In this embodiment, the connection structure 241 includes a through hole penetrating the second connection portion 24 along the thickness direction. The multiple through holes may be spaced apart along the circumferential direction. When the coil 94 is attached to the second connection portion 24, the contact portion of the leaf spring 941 of the coil 94 can enter the through hole from the bottom surface of the second connection portion 24, thereby limiting the coil 94 and the valve seat 2 in the axial direction and preventing the coil from coming off the valve seat 2 along the axial direction.

[0037] The recess 22 of the valve seat 2 is provided in the first connection portion 23 and includes a bottom portion 221 and a side portion 222. The side portion 222 extends upward along the axial direction while surrounding the outer edge of the bottom portion 221. The bottom portion 221 of the valve seat 2 further has a through hole 25 along the thickness direction, and the spindle 5 is inserted into the through hole 25.

[0038] The valve seat 2 further includes a valve core 26, which is integrally formed with the first connecting portion 23, and has a valve port 21. The spindle 5 engages with the valve port 21 to adjust the opening degree of the valve port 21. The valve core 26 and the first connecting portion 23 may be integrally processed by a forging and / or rolling process.

[0039] It can be understood that the valve core 26 having the valve port 21 may be of an integral structure with the first connecting portion 23 and the second connecting portion 24, and that the first connecting portion 23, the second connecting portion 24 and the valve core 26 may be integrally processed and molded, for example, by a forging and / or rolling process.

[0040] The first connecting portion 23 includes a straight cylinder segment 231 and a protrusion segment 232. The valve core portion 26 is provided at one end of the straight cylinder segment 231, and the valve port 21 communicates with the inside of the straight cylinder segment 231. The protrusion segment 232 is provided at the other end of the straight cylinder segment 231. The protrusion segment 232 is connected to the housing 1, and the second connecting portion 24 is provided surrounding the outer circumferential surface of the protrusion segment 232. The recess 22 is provided in the protrusion segment 232.

[0041] The protruding segment 232 has a connecting outer peripheral surface 234 formed by cutting. The housing 1 is fitted to the connecting outer peripheral surface 234 so that the outer peripheral surface of the housing 1 is flush with the outer peripheral surface of the protruding segment 232 .

[0042] In one embodiment, the housing 1 and the protruding segment 232 may be connected by, but is not limited to, laser welding.

[0043] It can be understood that the dimension of the connecting outer peripheral surface 234 in the axial direction is the engagement dimension between the housing 1 and the protruding segment 232. By obtaining the connecting outer peripheral surface 234 by cutting, the cutting accuracy can be controlled to precisely connect the connecting outer peripheral surface 234 and the housing 1, positioning with respect to the housing 1 can be achieved, and the coaxiality between the valve seat 2 and the housing 1 can be ensured, while the dimension of the connecting outer peripheral surface 234 in the axial direction can be controlled, and further, the connection strength between the housing 1 and the protruding segment 232 can be ensured.

[0044] A part of the valve core portion 26 is provided inside the straight cylinder segment 231, and another part of the valve core portion 26 protrudes from the straight cylinder segment 231. The part of the valve core portion 26 protruding from the straight cylinder segment 231 can be used to connect the first connecting pipe 91.

[0045] 8 and 9, which show cross-sectional views of different forming processes of the valve seat 2 of the first embodiment of the present disclosure. The first connecting portion 23 and the second connecting portion 24 are integrally processed by a forging and / or rolling process.

[0046] As shown in FIG. 8, the blank of the valve seat 2 can be integrally processed and formed by a forging and / or rolling process, and the blank may include a first connecting portion 23, a second connecting portion 24, and a valve core portion 26. By integrally forming the first connecting portion 23, the second connecting portion 24, and the valve core portion 26, the coaxiality between the second connecting portion 24 and the first connecting portion 23 is increased, and the coaxiality between the coil 94 and the valve seat 2 after assembly is ensured. In a vibration environment, the coil is stably connected to the valve seat 2, so that it is difficult to fall off along the axial direction. In the embodiment used in the related art, the part for connecting the coil and the part for connecting the housing are separate structures and connected by welding, the part for connecting the coil and the part for connecting the housing are loosely engaged with each other, and a gap exists between them, so that it is difficult to control the coaxiality between the two, and tilting is likely to occur during welding.

[0047] As shown in FIG. 9, after the blank of the valve seat 2 is integrally processed and formed by a forging and / or rolling process, the transverse hole 236 and the recess 22 can be initially processed by punching, machining, etc., and the transverse hole 236 is used to connect the second connecting pipe 92, and the recess 22 is used to connect the nut seat.

[0048] Finally, the valve port 21, the connecting outer peripheral surface 234, and the recess 22 are formed by a CNC machining center. The valve port 21, the connecting outer peripheral surface 234, and the recess 22 can be completed in one clamping operation without the need to change the clamping method, so that the concentricity of the valve port 21, the connecting outer peripheral surface 234, and the recess 22 is ensured.

[0049] As shown in Fig. 4, Fig. 4 shows a perspective view of the valve seat 2 of the second embodiment of the electronic expansion valve of the first embodiment of the present disclosure. The common points between the valve seat 2 of the second embodiment and the valve seat 2 of the first embodiment are omitted, and the difference between them lies in the connection structure 241 of the second connection part 24.

[0050] Specifically, the connection structure 241 is a notch that penetrates the outer circumferential surface of the second connection portion 24. A plurality of notches may be provided at intervals along the circumferential direction. The notch can engage with the coil leaf spring 941 to achieve locking.

[0051] It goes without saying that it can be understood that the connection structure 241 may be a through hole and a notch, and a plurality of through holes and a plurality of notches may be provided alternately along the circumferential direction.

[0052] As shown in Fig. 5 to Fig. 7, Fig. 5 shows a cross-sectional view of the electronic expansion valve of the second embodiment of the present disclosure. Fig. 6 shows a perspective view of the first connection part 23 and the second connection part 24 of the electronic expansion valve of the second embodiment of the present disclosure. Fig. 7 shows a cross-sectional view of the first connection part 23 and the second connection part 24 of the electronic expansion valve of the second embodiment of the present disclosure. Explanation of the commonalities between the electronic expansion valve of the second embodiment and the electronic expansion valve of the first embodiment will be omitted, and the differences between them are as follows: The electronic expansion valve of this embodiment includes a housing 1, a coil, a valve seat 2, a nut seat 3, a screw 4, a spindle 5, and a magnetic rotor 6. The housing 1 is connected to the valve seat 2, and together they form a cavity 13. The valve seat 2 has a valve port 21 and a recess 22 provided corresponding to the valve port 21. The coil is provided on the outer periphery of the housing 1.

[0053] The nut seat 3 is provided in the chamber 13 and is connected to the first connecting part 23 via the intermediate member 83. The screw 4 is provided in the chamber 13 and is screwed into the nut seat 3. The spindle 5 is connected to the screw 4 and is used to engage with the valve port 21 to adjust the opening degree of the valve port 21. The magnetic rotor 6 is provided in the chamber 13 and is inductively connected to the coil and connected to the screw 4.

[0054] The valve seat 2 includes a first connecting portion 23, a second connecting portion 24 and a valve core portion 26, the second connecting portion 24 being molded integrally with the first connecting portion 23, and the valve core portion 26 being connected to the first connecting portion 23 and having a separate structure from the first connecting portion 23.

[0055] The first connecting portion 23 includes a straight-tube segment 231 and a connection segment 235, and the second connecting portion 24 is provided surrounding the outer circumferential surface of the straight-tube segment 231. The connection segment 235 is connected to one end of the straight-tube segment 231 and extends radially inward. The connection segment 235 is connected to the valve core portion 26.

[0056] One end of the straight tube segment 231 has a connecting outer circumferential surface 234 formed by cutting, and the housing 1 is fitted to the connecting outer circumferential surface 234 so that the outer circumferential surface of the housing 1 is flush with the outer circumferential surface of the straight tube segment 231.

[0057] In the valve seat 2 of this embodiment, when processing, the member in which the first connection portion 23 and the second connection portion 24 are integrally formed can be processed separately, and the valve core portion 26 can be processed separately. Then, the member constituted by the first connection portion 23 and the second connection portion 24 is assembled to the valve core portion 26.

[0058] Specifically, the first connecting portion 23 and the second connecting portion 24 can be formed by integrally processing and forming blanks of the first connecting portion 23 and the second connecting portion 24 by a forging and / or rolling process, and then initially processing the horizontal hole 236 and the recess 22 by punching, machining, or the like, and finally forming the connection outer peripheral surface 234 and the recess 22 by a CNC machining center, with reference to the processing method shown in Figures 8 and 9. Similarly, the connection outer peripheral surface 234 and the recess 22 can be completed by one clamping without the need to change the clamping method, so that the concentricity of the connection outer peripheral surface 234 and the recess 22 is ensured.

[0059] The electronic expansion valve further includes a movable sleeve 42, an end cap 43, and a fastening member 44. The movable sleeve 42 is movably engaged with the valve core 26. One end of the movable sleeve 42 is provided with a flange 421, which extends inward along the radial direction of the movable sleeve 42 so that a diameter-reducing structure is formed at one end of the movable sleeve 42. The other end of the movable sleeve 42 is fixedly connected to the end cap 43. The end cap 43 forms an accommodating chamber 45 together with the movable sleeve 42. One end of the spindle 5 is limited within the accommodating chamber 45 by the flange 421 of the movable sleeve 42, so that the one end of the spindle 5 can move within the accommodating chamber 45 but cannot leave the accommodating chamber 45.

[0060] A hole is formed in the end cap 43, and the screw 4 is movably inserted into the hole of the end cap 43. The fastening member 44 is fixedly connected to one end of the screw 4 and detachably abuts on the inner wall surface of the end cap 43. One end of the elastic member 81 abuts on the spindle, and the other end abuts on the fastening member 44, so that the spindle 5 has a tendency to move away from the fastening member 44.

[0061] It will be appreciated that the elastic member 81 may be a compression spring, but is not limited thereto.

[0062] When the spindle 5 is not in contact with the valve port 21, the screw 4 moves the moving sleeve 42 to move axially relative to the valve core 26, and under the action of the elastic member 81, the spindle 5 contacts the flange 421 of the moving sleeve 42, but cannot leave the receiving chamber 45. When the spindle 5 contacts the valve port 21, the spindle 5 cannot continue to move downward, but the screw 4 still moves the moving sleeve 42 to move downward. In this case, the elastic member 81 is compressed to prevent the spindle 5 from being locked in the valve port 21, and also prevents the screw 4 from being screwed into the nut seat 3 and locked. As a result, when moving along the reverse direction, the screw 4 and the nut seat 3 can still rotate easily, and further, the spindle 5 can be moved upward to open the valve port 21.

[0063] The valve core portion 26 has a sleeve portion 261, and the movable sleeve 42 is provided within the sleeve portion 261 so as to be movable along the axial direction.

[0064] It is understood that each example / embodiment provided by the present disclosure can be combined with each other unless a contradiction occurs, but each example will not be described here.

[0065] In the embodiments of the present invention, the terms "first", "second", and "third" are used for explanatory purposes only and should not be understood as indicating or implying relative importance, and the term "plurality" refers to two or more than two unless explicitly limited. The terms "attached", "coupled", "connected", "fixed", etc. should all be understood in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection, and "connected" may be a direct connection or an indirect connection via an intermediate medium. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the invention according to the specific circumstances.

[0066] In describing the embodiments of the invention, it should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "rear" and the like are based on the orientations or positional relationships shown in the drawings and are merely for ease of describing and simplifying the description of the embodiments of the invention, and do not indicate or imply that the devices or units shown must have a particular direction, be configured and operated in a particular orientation, and should not be construed as limiting the embodiments of the invention.

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that the specific features, structures, materials, or characteristics described in the embodiment or example are included in at least one embodiment or example of the invention. In this specification, exemplary expressions for the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics of the description can be combined as appropriate in any one or more embodiments or examples.

[0068] The above is only a preferred embodiment of the invention, and is not intended to limit the invention, and those skilled in the art may make various modifications and changes to the invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the invention should be included within the protection scope of the invention.

Claims

1. a valve seat including a first connecting portion and a second connecting portion, the second connecting portion being integrally molded with the first connecting portion; A housing connected to the first connection portion; a coil fitted to an outer periphery of the housing and connected to the second connection portion; Including an electronic expansion valve.

2. 2. The electronic expansion valve as claimed in claim 1, wherein the second connecting portion includes a connecting structure, and the connecting structure is used to lock onto a leaf spring of the coil.

3. The electronic expansion valve according to claim 2 , wherein the connection structure includes a through hole penetrating the second connection portion along a thickness direction and / or a notch penetrating an outer circumferential surface of the second connection portion.

4. The valve seat further includes a valve core portion, the valve core portion is integrally formed with the first connecting portion, and the valve core portion has a valve port; 2. The electronic expansion valve as claimed in claim 1, further comprising a spindle, the spindle engaging with the valve port to adjust the opening degree of the valve port.

5. the first connection portion includes a straight tube segment and a protrusion segment, The valve core portion is provided at one end of the straight cylindrical segment, and the valve port communicates with the inside of the straight cylindrical segment, 5. The electronic expansion valve according to claim 4, wherein the protruding segment is provided at the other end of the straight cylinder segment, the protruding segment is connected to the housing, and the second connecting portion is provided surrounding an outer circumferential surface of the protruding segment.

6. 6. The electronic expansion valve according to claim 5, wherein the protruding segment has a connecting outer peripheral surface formed by cutting, and the housing is fitted to the connecting outer peripheral surface.

7. The valve seat further includes a valve core portion, the valve core portion is connected to the first connecting portion and has a structure separate from the first connecting portion, and the valve core portion has a valve port; 2. The electronic expansion valve as claimed in claim 1, further comprising a spindle, the spindle engaging with the valve port to adjust the opening degree of the valve port.

8. The first connection portion includes a straight tube segment and a connection segment, The second connection portion is provided to surround an outer circumferential surface of the straight cylindrical segment, The electronic expansion valve according to claim 7 , wherein the connection segment is connected to one end of the straight cylindrical segment and extends radially inward, the connection segment being connected to the valve core portion.

9. 9. The electronic expansion valve according to claim 8, wherein one end of the straight cylindrical segment has a connecting outer circumferential surface formed by cutting, and the housing is fitted onto the connecting outer circumferential surface.

10. The electronic expansion valve according to claim 1 , wherein the first connecting portion and the second connecting portion are integrally processed by a forging and / or rolling process.

11. A method for processing a valve seat of an electronic expansion valve, comprising: integrally processing and forming a blank for a valve seat; forming a connecting outer peripheral surface on the first connecting portion; and forming a valve port on the valve core portion, the blank includes a first connecting portion, a second connecting portion, and a valve core portion, the first connecting portion being used for connecting to a housing of the electronic expansion valve, and the second connecting portion being used for connecting to a coil of the electronic expansion valve; The connecting outer peripheral surface is used for connecting to the housing.

12. 12. The method for machining a valve seat of an electronic expansion valve as claimed in claim 11, wherein the connecting outer circumferential surface and the valve port are formed by one clamping operation.

13. The method further includes forming a recess in the first connecting portion by a cutting process while forming the connecting outer circumferential surface and the valve port; The method for processing a valve seat of an electronic expansion valve as claimed in claim 11, wherein the recess is used for connecting to a nut seat of the electronic expansion valve.

14. The valve seat blank is integrally formed.

12. The method for fabricating a valve seat of an electronic expansion valve as claimed in claim 11, comprising integrally fabricating a valve seat blank by a forging and / or rolling process.

15. Molding a connection outer circumferential surface on the first connection portion and molding a valve port on the valve core portion 12. The method for machining a valve seat of an electronic expansion valve as claimed in claim 11, comprising: forming an outer circumferential connection surface on the first connecting portion by a cutting process; and forming a valve port on the valve core portion.

16. A method for processing a valve seat of an electronic expansion valve, comprising: integrally processing and molding a first connection part and a second connection part of a valve seat; forming an outer circumferential connection surface on the first connection part; forming a valve core part having a valve port, and assembling the valve core part and the first connection part, The method for processing a valve seat of an electronic expansion valve, wherein the first connecting portion is used for connecting to a housing of the electronic expansion valve, and the second connecting portion is used for connecting to a coil of the electronic expansion valve.

17. 17. The method for machining a valve seat of an electronic expansion valve according to claim 16, wherein a recess is formed in the first connection portion by a cutting method while forming the connection outer peripheral surface, and the recess is used for connecting to a nut seat of the electronic expansion valve.

18. The first connecting portion and the second connecting portion of the valve seat are integrally processed and molded, 17. The method for processing a valve seat of an electronic expansion valve as claimed in claim 16, comprising integrally processing and forming the first connecting portion and the second connecting portion of the valve seat by a forging and / or rolling process.

19. The molding of the connection outer circumferential surface on the first connection portion includes:

17. The method for processing a valve seat of an electronic expansion valve as claimed in claim 16, further comprising forming a connecting outer circumferential surface on the first connecting portion by a cutting process.

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