Electric valve

Abstract

The present invention discloses an electrically operated valve including a nut unit (5), a valve seat unit (4), and a sleeve (6), the nut unit including a plastic member (51) and a connecting portion (52), the connecting portion being fixed to the plastic member, the connecting portion being made of a metallic material, the sleeve being fixedly connected to the connecting portion, the connecting portion including a lower end surface portion (522), the valve seat unit including a first end portion (47), the first end portion being made of a metallic material, and the first end portion being welded and fixed to the lower end surface portion. In this electrically operated valve, the sleeve is fixedly connected to the connecting portion, and the first end of the valve seat unit is welded and fixed to the lower end surface portion, eliminating the need to separately machine an engagement structure for engaging with the connecting portion in the valve seat unit, thereby reducing the manufacturing costs of the electrically operated valve.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on September 29, 2022, bearing application number 202211203795.7 and entitled "Motor-operated valve," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of fluid control, and more particularly to motor-operated valves. [Background technology]

[0003] The electric valve includes a nut unit, a valve seat unit, and a sleeve, and the nut unit has a connecting plate by which the nut unit is fixedly connected to the valve seat unit, and the sleeve is fixedly connected to the valve seat unit.The valve seat unit needs to be machined to have an engaging structure for the connecting plate and an engaging structure for the sleeve, and this arrangement is disadvantageous in reducing the processing costs of the electric valve. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a motor-operated valve that reduces the manufacturing costs of the motor-operated valve. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention is as follows. The motor-operated valve of the present invention includes a nut unit, a valve seat unit, and a sleeve, the nut unit includes a plastic member and a connecting portion, the connecting portion is fixed to the plastic member, the connecting portion is made of a metal material, and the sleeve is fixed and connected to the connecting portion, The connection portion includes a lower end surface portion, the valve seat unit includes a first end portion, the material of the first end portion is a metal material, and the first end portion is welded and fixed to the lower end surface portion. [Effects of the Invention]

[0006] The electric valve of the present invention includes a nut unit, a valve seat unit, and a sleeve, the nut unit includes a plastic member and a connecting portion, the connecting portion is fixed to the plastic member, the connecting portion is made of a metal material, the sleeve is fixed and connected to the connecting portion, the connecting portion includes a lower end surface portion, the valve seat unit includes a first end portion, the first end portion is made of a metal material, and the first end portion is welded and fixed to the lower end surface portion. By arranging it in this manner, the sleeve is fixed and connected to the connecting portion, and the first end of the valve seat unit is welded and fixed to the lower end surface portion, so there is no need to separately process an engagement structure for the valve seat unit to engage with the connecting portion, which reduces the processing costs of the electric valve. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a front view of a motor-operated valve according to a first embodiment of the present invention. [Figure 2] 2 is a cross-sectional view of the motor-operated valve shown in FIG. 1 taken along the plane AA. [Figure 3] FIG. 3 is a three-dimensional view of the valve member shown in FIG. 2. [Figure 4] FIG. 4 is a front view of the valve member shown in FIG. 3. [Figure 5] 5 is a cross-sectional view taken along the plane BB of the valve member shown in FIG. 4. [Figure 6] FIG. 6 is an enlarged view of part A shown in FIG. 5. [Figure 7] 3 is a cross-sectional view of the crimped portion of the valve seat unit shown in FIG. 2 after crimping. [Figure 8] 3 is a cross-sectional view of the crimped portion of the valve seat unit shown in FIG. 2 before crimping. [Figure 9] 3 is a cross-sectional view of the crimped portion of the first valve seat portion shown in FIG. 2 before crimping. [Figure 10] FIG. 3 is a cross-sectional view of the second valve seat portion shown in FIG. 2. [Figure 11] FIG. 3 is a front view of the nut unit shown in FIG. 2. [Figure 12]12 is a cross-sectional view taken along plane CC of the nut unit shown in FIG. 11. [Figure 13] FIG. 13 is a three-dimensional view of the connection portion shown in FIG. [Figure 14] FIG. 14 is a plan view of the connection portion shown in FIG. [Figure 15] FIG. 4 is a front view of a motor-operated valve according to a second embodiment of the present invention. [Figure 16] 16 is a cross-sectional view taken along the DD plane of the motor-operated valve shown in FIG. 15. [Figure 17] FIG. 17 is an enlarged view of part B shown in FIG. [Figure 18] FIG. 17 is a cross-sectional view of the valve member shown in FIG. [Figure 19] FIG. 17 is a cross-sectional view of the nut unit shown in FIG. 16. [Figure 20] FIG. 20 is a three-dimensional view of the connection portion shown in FIG. [Figure 21] FIG. 21 is a plan view of the connection portion of FIG. 20. [Figure 22] 17 is an enlarged view of another embodiment of part B shown in FIG. 16. FIG. [Figure 23] FIG. 4 is a cross-sectional view of a motor-operated valve according to a third embodiment of the present invention. [Figure 24] FIG. 24 is an enlarged view of part C shown in FIG. [Figure 25] FIG. 24 is a cross-sectional view of the sleeve shown in FIG. 23. [Figure 26] 24 is an enlarged view of a portion C of the motor-operated valve of the third embodiment shown in FIG. 23. FIG. [Figure 27] FIG. 10 is a front view of a motor-operated valve according to a fifth embodiment of the present invention. [Figure 28] 28 is a cross-sectional view taken along the EE plane of the motor-operated valve shown in FIG. 27. [Figure 29] FIG. 29 is a front view of the valve member shown in FIG. 28. [Figure 30] FIG. 30 is a cross-sectional view taken along the FF plane of the valve member shown in FIG. 29. [Figure 31] FIG. 29 is a cross-sectional view of the nut unit shown in FIG. 28. [Figure 32] FIG. 32 is a three-dimensional view of the connection portion shown in FIG. 31. [Figure 33] FIG. 33 is a plan view of the connection portion shown in FIG. 32. [Figure 34] FIG. 10 is a front view of a motor-operated valve according to a sixth embodiment of the present invention. [Figure 35] 35 is a cross-sectional view taken along the plane GG of the motor-operated valve shown in FIG. 34. [Figure 36] 35 is a cross-sectional view taken along the HH plane of the motor-operated valve shown in FIG. 34. [Figure 37] FIG. 35 is a structural diagram of a combination of the valve member and the connection unit shown in FIG. 34. [Figure 38] FIG. 35 is a three-dimensional view of the valve member shown in FIG. 34. [Figure 39] FIG. 10 is a front view of a motor-operated valve according to a seventh embodiment of the present invention. [Figure 40] 40 is a cross-sectional view taken along plane II of the motor-operated valve shown in FIG. 39. [Figure 41] FIG. 41 is a cross-sectional view of the valve member shown in FIG. 40. [Figure 42] FIG. 42 is a three-dimensional view of the nut unit shown in FIG. 41. [Figure 43] FIG. 42 is a front view of the nut unit shown in FIG. 41. [Figure 44] FIG. 44 is a three-dimensional view of the connection portion shown in FIG. 43. [Figure 45] FIG. 44 is a plan view of the connection portion shown in FIG. 43. [Figure 46] FIG. 13 is a cross-sectional view of another modified valve member of the motor-operated valve of the sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] The invention is further illustrated in the following figures and examples:

[0009] The motor-operated valve 100 according to a first embodiment of the present invention, shown in Figures 1 to 14, includes an electronic expansion valve and is applicable to refrigerant systems, such as commercial or vehicle thermal management systems, or other systems requiring thermal management, such as thermal management of batteries and thermal management of electrical devices.

[0010] The motor-operated valve 100 shown in FIGS. 1 and 2 includes a valve body 11, a valve member 12, and a coil unit 13. In this embodiment, the valve member 12 is fixedly connected to the valve body 11, and the coil unit 13 is fixedly connected to the valve body 11. The valve body 11 has a valve body chamber 115, and at least a portion of the valve member 12 is located in the valve body chamber 115. In other embodiments, the coil unit 13 may be fixedly connected to the valve member 12, and the two may be attached and then fixedly connected to the valve body 11. The valve body 11 in this embodiment is an independent valve block, and in other embodiments, the valve body 11 may be part of a system, for example, part of a heat exchanger or a flow path plate. The coil unit 13 includes a stator unit 131 and an injection molded body 132 . The injection molded body 132 is injection molded and covers at least a part of the stator unit 131 , the coil unit 13 has a chamber 133 , and at least a part of the valve member 12 is located in this chamber 133 . The valve member 12 includes a valve seat unit 4 , a nut unit 5 , a sleeve 6 , a rotor unit 121 and a valve body unit 122 . At least a portion of the sleeve 6 is located in the chamber 133, the stator unit 131 is located outside the sleeve 6, the rotor unit 121 is located inside the sleeve 6, the valve body unit 122 is connected to the rotor unit 121, and by passing a predetermined current through the stator unit 131, an excitation magnetic field is generated, causing the rotor unit 121 to rotate, which in turn causes the valve body unit 122 to rotate, and the valve body unit 122 is threadedly engaged with the nut unit 5 to convert the rotation of the rotor unit 121 into axial movement of the valve body unit 122 relative to the valve seat unit 4. The valve body unit 122 in this embodiment includes a screw rod portion 1221 and a valve body portion 1222 . The screw rod portion 1221 and the valve body portion 1222 are connected by a separate structure, and the connection method includes a fixed connection, a position-limited connection, or a transmission connection. A male thread 81 is formed on the screw rod portion 1221, and an engaging female thread 82 is formed on the nut unit 5. The screw rod portion 1221 is threadedly engaged with the nut unit 5 to convert the rotation of the rotor unit 121 into axial movement of the screw rod portion 1221 relative to the nut unit 5. In other embodiments, the screw rod portion 1221 and the valve body portion 1222 have an integral structure, in other words, they may be molded as a single unit. The valve seat unit 4 has a valve orifice portion 44, which has a valve orifice 441, the valve body unit 122 moves axially relative to the valve orifice 441, and the valve body portion 1222 of the valve body unit 122 engages with the valve orifice 441, and the flow area of ​​the valve orifice 441, in other words, the opening degree of the valve orifice 441, can be adjusted to achieve refrigerant flow rate adjustment. For convenience of description, the upper and lower directions are defined as the upper and lower directions in the drawings of the specification, and the upper and lower directions only indicate the relative positions of the product, not the actual state of the product when used. For example, although the coil unit 13 shown in FIG. 1 is located above the valve body 11, in actual use the coil unit 13 is not necessarily located above the valve body 11. This is because the motor-operated valve may be installed laterally or at an angle. When installed laterally, the coil unit 13 is located on the left or right side of the valve body 11. Such situations or similar situations are all within the scope of protection of the present invention.

[0011] The nut unit 5 in this embodiment shown in FIGS. 2 to 6 and 10 to 13 includes a plastic member 51 and a connecting portion 52. As shown in FIG. The connecting portion 52 is fixed to the plastic member 51 by a fixing method including injection molding fixing, clamping, gluing, or a combination of clamping and gluing. The connecting portion 52 in this embodiment is used as an injection molding insert to form the nut unit 5, and the plastic member 51 covers a part of the connecting portion 52, for example, covers the inner part of the connecting portion 52 in this embodiment. In this embodiment, the material of the connecting portion 52 is a metal material, the material of the sleeve 6 is a metal material, for example, a stainless steel material, and the plastic member 51 is specifically a special engineering plastic or composite material having a certain strength, for example, a mechanically reinforced polyetheretherketone material (PEEK) or a modified polyetheretherketone material (PEEK), or a mechanically reinforced polyphenylene sulfide (PPS) or a modified polyphenylene sulfide (PPS) material. The plastic member 51 in this embodiment has a one-piece structure and is injection molded as a single piece. In other configurations, the plastic member 51 may be a separately molded structure, with a fixed or position-limited connection forming the plastic member 51 . In this embodiment, the portion of connecting portion 52 connected to plastic member 51 has a fixing reinforcement portion 523, which is located on the inner side of connecting portion 52, and at least a portion of which is covered by plastic member 51. For example, the inner periphery of connecting portion 52 has a non-circular structure, and the inner shape of the inner wall cross section may be, for example, a square, a hexagon, or an irregular circle or plum shape having some straight sides. By arranging in this manner, the connection strength between connecting portion 52 and plastic member 51 can be improved. Compared to the case where the connecting portion 52 has a side wall with a circular structure, the connecting portion 52 can be prevented from rotating in the circumferential direction relative to the plastic member 51. In other embodiments, the inner circumference of the connecting portion 52 may be machined with a structure that can achieve similar functions, such as a groove structure, a protrusion structure, or a knurling, or in the axial direction, a through-hole, a groove, a protrusion, or other structure may be machined, or the above structures may be combined and arranged.

[0012] The sleeve 6 in this embodiment shown in FIGS. 2 and 5 is fixedly connected to the connecting portion 52. Specifically, the sleeve 6 in this embodiment includes an opening 61 , a sleeve body 62 and a sleeve ceiling 63 . The opening 61 for this sleeve ceiling 63 is close to the connecting portion 52 , and the sleeve 6 has an opening at the opening 61 , and the sleeve ceiling 63 closes the upper end of the sleeve 6 . The material of the connection portion 52 is stainless steel, the material of the sleeve 6 is stainless steel, and the opening 61 of the sleeve 6 is fixed to the connection portion 52 by welding, and the welding method includes laser welding, brazing, etc., and in this embodiment, the opening 61 of the sleeve 6 is fixed to the connection portion 52 by laser.

[0013] The valve seat unit 4 shown in Figures 2 to 9 includes a first valve seat portion 41, which includes a crimping portion 411 and a support portion 412, and the lower end of the connection portion 52 abuts against the support portion 412. As a result, the support portion 412 restricts the position of the connection portion 52, restricting the lowest position of the connection portion 52 relative to the first valve seat portion 41, and the abutment between the lower end of the connection portion 52 and the support portion 412 includes direct abutment or indirect abutment. After the crimping portion is crimped, at least a portion of the crimping portion 411 extends in the direction of the central axis of the nut unit 5, at least a portion of the crimping portion 411 abuts against the connecting portion 52, at least a portion of the crimping portion 411 is located above the connecting portion 52, the crimping portion 411 restricts the position of the connecting portion 52 and restricts movement of the connecting portion 52 away from the valve seat unit 4 along the axial direction of the electric valve, and the connecting portion 52 is fixed to the first valve seat portion 41 by the crimping portion 411. By arranging them in this manner, the connection between the nut unit 5 and the valve seat unit 4 is simplified, and one welding process is reduced for the welding connection between the nut unit 5 and the valve seat unit 4, thereby reducing manufacturing costs.

[0014] The valve seat unit 4 in this embodiment shown in Figures 2 to 9 further includes a second valve seat portion 42, and the first valve seat portion 41 and the second valve seat portion 42 are connected so as to be fixed or have a restricted position. The material of the first valve seat portion 41 is aluminum, and using this aluminum material reduces the weight of the valve seat unit 4, thereby reducing the overall weight of the electric valve, and also makes it easier to crimp and bend the crimping portion 411, thereby reducing the difficulty of crimping. In this embodiment, the crimping portion 411 is located at the upper end of the first valve seat portion 41 and includes a base portion 4111 and an end portion 4112. This end portion 4112 is located above the base portion 4111 and is crimped and crimped, thereby being bent toward the central axis of the nut unit 5, and at least a portion of the end portion 4112 is located above the connection portion 52. Before being crimped, the crimping portion 411 is machined or otherwise pre-processed and shaped, and before being crimped, the end portion 4112 is arranged approximately coaxially with the base portion 4111, and after being crimped, the end portion 4112 is bent toward the central axis of the nut unit 5. In this embodiment, the connecting portion 52 includes an outer edge 525 located on the outer periphery of the connecting portion 52, and the end portion 4112 abuts against the outer edge 525 of the connecting portion 52, or abuts against an upper end surface close to the outer edge 525, or includes both of the above situations simultaneously, and in this manner, the connecting portion 52 is restricted from separating from the valve seat unit 4 along the axial direction. In this case, the outer edge of the connecting portion 52 and the base portion 4111 are loosely fitted, abuttingly engaged, or tightly fitted, and the base portion 4111 limits the radial position of the connecting portion 52.

[0015] In other embodiments, the base portion 4111 may abut against the outer edge 525 of the connecting portion 52 to limit the axial position of the connecting portion 52 . In another embodiment, the crimping portion 411 further includes a transition portion 4113 located between the base portion 4111 and the end portion 4112 and abutting against the outer edge 525 of the connecting portion 52 to limit the axial or radial position of the connecting portion 52. The end portion 4112 or the transition portion between the end portion 4112 and the base portion 4111 may abut against the outer edge of the connecting portion 52, thereby limiting the radial position of the connecting portion 52.

[0016] In other embodiments, the crimping portion 411 may be formed by pressing, using a jig to press the first valve seat portion 41 to form the crimping portion 411, and the connecting portion 52 is fixed to the first valve seat portion 41 by this crimping portion 411.

[0017] The plastic member 51 of the nut unit 5 in this embodiment shown in FIGS. 2 to 12 includes a main body portion 511 and a nut portion 512. As shown in FIG. The outer diameter of the main body portion 511 is larger than the outer diameter of the nut portion 512 overall, the main body portion 511 is positioned relatively close to the valve seat unit 4, and the connection portion 52 and the main body portion 511 are connected by injection molding. The nut portion 512 includes a first through hole 5121 , and the nut portion 512 further includes an internal thread 82 located on the wall that defines the first through hole 5121 . The screw rod portion 1221 passes through the first through hole 5121, and the portion of the screw rod portion 1221 that passes through the first through hole 5121 is connected to the rotor unit 121, and this connection method includes welding, and the outer wall of the screw rod portion 1221 has a male thread 81 that engages with a female thread 82, and the screw rod portion 1221 and the nut portion 512 are threadedly engaged. In this embodiment, the nut portion 512 has a guide segment 5112 located below the female thread 82, and the screw rod portion 1221 has a portion that engages with the guide segment 5112, and the guide segment 5112 can provide a guide for the screw rod portion 1221. In other embodiments, the guide segments may be provided above the internal threads 82 .

[0018] The valve seat unit 4 in this embodiment shown in Figures 2 to 10 further includes a second valve seat portion 42, which is approximately hollow and cylindrical, and at least a portion of the valve body unit 122 is located in the inner chamber of the second valve seat portion 42, and the second valve seat portion 42 has a valve orifice portion 44. The valve orifice portion 44 has a valve orifice 441, and the valve body unit 122 moves axially relative to the valve orifice 441. The valve body portion 1222 of the valve body unit 122 engages with the valve orifice 441, thereby adjusting the flow area of ​​the valve orifice 441 and achieving refrigerant flow rate adjustment. The second valve seat portion 42 further includes a side hole 45 located between the valve opening portion 44 and the first valve seat portion 41 . The first valve seat portion 41 has an attachment hole 413, and at least a portion of the second valve seat portion 42 is located in the attachment hole 413. In this embodiment, the second valve seat portion 42 penetrates the first valve seat portion 41, and the first valve seat portion 41 and the second valve seat portion 42 are connected, and the connection method includes a fixed connection and a position-limited connection.

[0019] The valve body 11 in this embodiment includes a first flow path 111 , a second flow path 112 , a first inner chamber 113 and a second inner chamber 114 . The first flow path 111 communicates with the first inner chamber 113, and the second flow path 112 communicates with the second inner chamber 114, and the first inner chamber 113 and the second inner chamber 114 can communicate with each other via a valve port 441. In this embodiment, the chamber of the second valve seat portion 42 communicates with the first inner chamber 113 via the side hole 45 .

[0020] In this embodiment shown in Figures 2 to 10, the outer peripheral wall of the second valve seat portion 42 is tightly fitted into the inner peripheral wall that forms the mounting hole 413, the first valve seat portion 41 has a step portion 414 located in the mounting hole 413, and the second valve seat portion 42 has a flange portion 421. The lower end surface of this flange portion 421 abuts against the bottom surface of the step portion 414, limiting the lowest position of the second valve seat portion 42 relative to the first valve seat portion 41, and the first valve seat portion 41 includes a position limiting structure 415 abutting against the flange portion 421, at least a portion of which is located above the flange portion 421, and the position limiting structure 415 limits the first valve seat portion 41 from moving away from the second valve seat portion 42. In this embodiment, the position limiting structure 415 is formed by pressing using a pressing method, and the second valve seat portion 42 is pressed using a jig to form the position limiting structure 415, which extends in the direction of the central axis of the electric valve, and the second valve seat portion 42 is fixed to the first valve seat portion 41 by the position limiting structure 415. By arranging them in this manner, the first valve seat portion 41 and the second valve seat portion 42 can be easily connected, and a welding step can be omitted. In other embodiments, the position limiting structure 415 may be pre-formed, and after being crimped, a portion of the position limiting structure 415 extends in the axial direction of the motor-operated valve. In other embodiments, the first valve seat portion 41 and the second valve seat portion 42 may be fixed by an interference fit, or by a combination of an interference fit and adhesive, or by welding or a threaded connection.

[0021] In this embodiment shown in Figures 5 and 12, the main body portion 511 of the nut unit 5 has a guide portion 5111 that engages with the second valve seat portion 42, and the second valve seat portion 42 is approximately hollow and cylindrical, and the outer periphery of the second valve seat portion 42 abuts against the main body portion 511 or is loosely fitted thereto. By arranging them in this manner, the coaxiality between the second valve seat portion 42 and the valve body unit 122 can be improved.

[0022] The first valve seat portion 41 in this embodiment shown in FIGS. 2 to 8 includes a balance hole 14 that penetrates the first valve seat portion 41 along the axial direction of the motor-operated valve. The number of balancing holes 14 can be set according to needs, and the number of balancing holes 14 in this embodiment is two. By providing the balancing hole 14, the pressures in the chambers corresponding to both ends of the balancing hole 14 can be balanced, thereby reducing the valve opening force. The first valve seat portion 41 in this embodiment is made of aluminum material, which can reduce the difficulty of machining the balance hole 14 compared to when it is made of a material such as stainless steel.

[0023] The valve body 11 in the motor-operated valve of this embodiment shown in Figures 2 to 9 has a valve body chamber 115, at least a part of the valve seat unit 4 is located in the valve body chamber 115, the first inner chamber 113 is part of the valve body chamber 115, the first valve seat portion 41 has a male thread portion 83, and the inner wall forming the valve body chamber 115 has a female thread portion 84 that engages with the male thread portion 83, and the valve seat unit 4 and the valve body 11 are fixed by threaded engagement.

[0024] The first valve seat portion 41 in the present embodiment shown in FIGS. 2 to 9 includes a first portion 416 and a second portion 417. As shown in FIG. The first part 416 is located above the second part 417 and is relatively close to the coil unit 13, the first part 416 includes the support part 412 and the crimping part 411, the second part 417 has the male thread part 83, and this male thread part 83 is provided on the outer periphery of the second part 417, and the first part 416 further has an engagement edge 4161. The engagement edge 4161 is located on the outer periphery of the first part 416 and is used as a force point for engaging an external fastening tool, and may have, for example, a hexagonal structure or a square structure. When an external fastening tool, such as a hexagonal wrench, engages with the engagement edge 4161, the valve seat unit 4 is screwed onto the valve body 11, and the lower end surface of the first part 416 abuts against the valve body 11, limiting the lowest position of the valve seat unit 4 relative to the valve body.

[0025] The motor-operated valve shown in Figures 2 to 6 further includes a first sealing member 151, which is positioned so as to be pressed between the connection portion 52 and the first valve seat portion 41 and abuts against the connection portion 52 and the first valve seat portion 41, respectively. The first sealing member 151 is located between the support portion 412 and the connecting portion 52, and the support portion 412 and / or the connecting portion 52 has a first groove 1511, and the first sealing member 151 is accommodated in the first groove 1511. By positioning the first sealing member 151, the operating medium can be prevented from leaking outside the electric valve through the gap between the connecting part 52 and the supporting part 412, and the first groove 1511 in this embodiment is located in the valve body 11.

[0026] The motor-operated valve shown in FIGS. 2 to 6 further includes a second sealing member 152 located between the injection molded body 132 and the sleeve 6. As shown in FIG. The inside and outside of this second sealing member 152 are abutted against the injection molded body 132 and the sleeve 6, respectively, and the second sealing member 152 is pressed between the injection molded body 132 and the sleeve 6. By placing the second sealing member 152, it is possible to prevent external water vapor or harmful substances from entering the gap between the sleeve 6 and the coil unit 13 and corroding the coil unit 13 or other components, thereby improving the lifespan and reliability of the electric valve. The lower end of the second sealing member 152 abuts against the crimping portion 411 or the connecting portion 52, or a support gasket for supporting the second sealing member 152 is provided below the second sealing member 152.

[0027] The motor-operated valve of this embodiment shown in FIGS. 2 to 6 further includes a third sealing member 153 and a fourth sealing member 154 located on both sides of the side hole 45, respectively. In this embodiment, the third sealing member 153 is located below or below the male thread portion 83 and is pressed between the second part 417 of the first valve seat portion 41 and the valve body 11, or restricts the operating medium from leaking from between the first valve seat portion 41 and the valve body 11 to the outside of the electric valve, and in other embodiments, the third sealing member 153 may be provided between the first part 416 and the valve body 11. The fourth sealing member 154 is pressed between the valve orifice portion 44 of the second valve seat portion 42 and the valve body 11 to restrict the operating medium in the first inner chamber 113 and the second inner chamber 114 from flowing through the gap between the valve orifice portion 44 and the valve body 11. In this embodiment, the valve seat unit 4 further includes grooves for accommodating the third sealing member 153 and the fourth sealing member 154. In other embodiments, the valve body 11 may be provided with grooves for accommodating the third sealing member and the fourth sealing member, or both the valve body 11 and the valve seat unit 4 may be provided with partial grooves for accommodating the third sealing member and the fourth sealing member.

[0028] The motor-operated valve 100 of the second embodiment shown in FIGS. 15 to 21 includes a nut unit 5, a valve seat portion 43, and a sleeve 6. The nut unit 5 includes a plastic member 51 and a connecting portion 52, and the connecting portion 52 is fixed to the plastic member 51 by a fixing method including injection molding fixing, or fastening, or bonding, or a combination of fastening and bonding. Then, the nut unit 5 or a part of the nut unit 5 is formed by injection molding using the connection portion 52 in this embodiment as an injection molding insert, and the plastic member 51 covers a part of the connection portion 52, for example, covers the inner part of the connection portion 52 in this embodiment. In this embodiment, the material of the connecting portion 52 is a metal material, the material of the sleeve 6 is a metal material, for example, a stainless steel material, and the plastic member 51 is specifically a special engineering plastic or composite material having a certain strength, for example, a mechanically reinforced polyetheretherketone material (PEEK) or a modified polyetheretherketone material (PEEK), or a mechanically reinforced polyphenylene sulfide (PPS) or a modified polyphenylene sulfide (PPS) material. The plastic member 51 in this embodiment has a one-piece structure and is injection molded as a single piece. In other configurations, the plastic member 51 may be a separately molded structure, with a fixed or position-limited connection forming the plastic member 51 . In this embodiment, the portion of the connecting portion 52 connected to the plastic member 51 has a fixing reinforcement portion 523, which is located on the inner side of the connecting portion 52 and at least a portion of which is covered by the plastic member 51. For example, the inner periphery of the connecting portion 52 has a non-circular structure, and the inner shape of the cross section of the inner wall may be, for example, a rectangle, a hexagon, or an irregular circle or plum shape having some straight sides. By arranging them in this way, the connection strength between the connecting portion 52 and the plastic member 51 can be improved. Compared to the case where the connecting portion 52 has a side wall with a circular structure, the connecting portion 52 can be prevented from rotating in the circumferential direction relative to the plastic member 51. In other embodiments, the inner circumference of the connecting portion 52 may be machined with a structure that can achieve similar functions, such as a groove structure, a protrusion structure, or a knurling, or the axial direction of the connecting portion 52 may be machined with a through-hole, a groove, a protrusion, or other structure, or the above structures may be combined and arranged.

[0029] The sleeve 6 in this embodiment shown in Figures 15 to 21 includes an opening 61, a sleeve main body 62, and a sleeve ceiling portion 63, and the opening 61 and the sleeve main body 62 are of an integral structure, with the opening 61 located below the sleeve main body 62 and the sleeve ceiling portion 63 located above the sleeve main body 62, closing the tip of the sleeve 6. The opening 61 is fixed to the connection portion 52 by welding, and this connection portion 52 includes an upper end surface portion 521, and the opening 61 is fixed by welding to the upper end surface portion 521, and at least a portion of the upper end surface portion 521 is located outside the opening 61 along the radial direction of the electric valve. The upper end surface portion 521 includes a flat surface, for example, the entire upper end surface portion 521 is flat, or most of it is flat, but at least the portion where it is connected to the sleeve 6 is flat, and the flat surface of the present invention may have a certain degree of roughness. The upper end surface portion 521 is located on the upper surface of the connection portion 52, the opening 61 is abutted against the upper end surface portion 521 and fixed by welding, and at least a portion of the upper end surface portion 521 is located outside the opening 61 along the radial direction of the electric valve; in other words, there is a predetermined distance between the outer edge of the opening 61 and the outer edge of at least a portion of the upper end surface portion 521. By engaging the sleeve 6 and the upper end surface 521 of the connecting portion 52 in the above manner, the welding structure of the motor-operated valve can be simplified. The upper surface of the connection portion 52 is arranged as a flat surface, and the entire upper end surface portion 521 may be flat. By arranging the connecting portion 52 in this manner, the processing of the connecting portion 52 is facilitated. For example, the connecting portion 52 can be processed and formed by pressing, forging, warm upset forging, or other methods, thereby reducing or eliminating the machining steps of the connecting portion 52 and reducing the processing cost. In addition, the height of the connecting portion 52 can be reduced by arranging the step structure and the opening 61 of the sleeve 6 to be engaged and then welded, thereby reducing the overall height of the electric valve.

[0030] In this embodiment, the upper end surface 521 is flat, and the distance between the outer edge of the opening 61 and the outer edge of the upper end surface 521 along the radial direction of the electric valve is 0.4 mm or more, and the opening 61 is fixed to the connection portion 52 by laser welding. This arrangement provides a good welding penetration depth and improves the welding quality of the welded portion. To provide a better welding effect, the distance between the outer edge of the opening 61 and the outer edge of the upper end surface 521 is 0.5 mm or more. The welding surface in this embodiment simultaneously seals the gap between the sleeve 6 and the connecting portion 52 .

[0031] In another embodiment, the upper end surface portion 521 shown in FIGS. 15 to 21 is flat, and the outer edge of the upper end surface portion 521 includes a first edge 5211 and a second edge 5212. The outer diameter of the second edge 5212 is larger than the outer diameter of the first edge 5211, and in this embodiment the first edge 5211 is the smallest outer diameter point of the outer edge of the upper end surface portion 521, and the second edge 5212 is the largest outer diameter point of the outer edge of the upper end surface portion, the outer edge of the opening 61 does not exceed the first edge 5211, the distance between at least a part of the outer edge of the opening 61 and the second edge 5212 is 0.4 mm or more, and the opening 61 is laser welded to the connection portion 52. The outer edge of this connection portion 52, i.e., the upper end surface portion 521, may not be a regular circle, but may be, for example, hexagonal or approximately hexagonal, or may be limited by the radial size of the connection portion 52, allowing a portion of the outer edge of the opening 61 to be aligned or nearly aligned with the outer edge of the connection portion 52, but not exceed the outer edge of the connection portion 52, i.e., the outer edge of the opening 61 does not exceed the first edge 5211, but the distance between at least a portion of the outer edge of the opening 61 and the second edge 5212 is 0.4 mm or more. For example, the connecting portion 52 in the following embodiment has an engagement portion 524 located on the outer periphery of the connecting portion 52, and the engagement portion 524 is approximately hexagonal, i.e., the outer edge of the connecting portion 52 is approximately hexagonal, allowing the outer edge of a portion of the opening 61 to be aligned or nearly aligned with the outer edge of the small diameter portion of the connecting portion 52, but not exceeding the outer edge of the connecting portion 52. In this embodiment, the distance between the outer edge of the opening 61 and the first edge 5211 is 0.4 mm or more.

[0032] The sleeve 6 in this embodiment shown in Figures 15 to 21 has an integral structure, and the sleeve 6 is processed and molded as an integral unit, for example, by pressing, pulling, or other methods, which makes processing easy. The sleeve body 62 is arranged equidiametrically, and the opening 61 is arranged equidiametrically with the sleeve body 62 and perpendicular to the upper end surface portion 521, this perpendicular arrangement including approximately perpendicular, where equidiametric means that the inner diameters are equal, and the opening 61 includes a first lower end surface 611 that abuts and is laser welded to the upper end surface portion 521. In this embodiment, the outer diameter of the opening 61 is also equal to the outer diameter of the sleeve body 62 . By arranging in this manner, the processing of the sleeve 6 can be simplified.

[0033] The plastic member 51 in this embodiment shown in FIGS. 15 to 21 includes a sleeve positioning portion 513 molded in a main body portion 511 of the plastic member 51, and the sleeve 6 is fitted onto the outer periphery of the sleeve positioning portion 513. This sleeve positioning portion 513 abuts against the inner wall of the sleeve 6, restricting the radial position of the sleeve 6 and further restricting the position of the sleeve 6 relative to the connection portion 52, thereby improving the positioning accuracy between the sleeve 6 and the connection portion 52. In this embodiment, the sleeve 6 is tightly fitted into the sleeve positioning portion 513, improving the positioning accuracy and further improving the coaxiality of the electric valve. Of course, in other embodiments, an external tool may be used to position the sleeve 6 .

[0034] In this embodiment, the plastic member 51 of the nut unit 5 has a first male thread 85, which is located on the outer periphery of the plastic member 51 and below the connection portion 52, and the electric valve further includes a valve body 11. The valve body 11 has a valve body chamber 115, and further has a first female screw 86 that engages with the first male screw 85. The first female screw 86 is located on the wall that forms the valve body chamber 115. The nut unit 5 and the valve body 11 are fixed by threaded engagement. In this embodiment, the lower end surface 522 of the connection part 52 abuts against the valve body 11, limiting the position of the connection part 52 relative to the valve body 11. By arranging in this manner, the risk of corrosion due to salt mist at the threaded engagement point can be reduced.

[0035] Compared to the electric valve of the first embodiment, the electric valve of this embodiment includes a valve seat portion 43, the valve port 441 is located in the valve seat portion 43, and the valve seat portion 43 and the nut unit 5 are threadedly engaged, or interference-fitted, or threadedly engaged and bonded, or interference-fitted and bonded. Such an arrangement simplifies the structure of the motor-operated valve, resulting in fewer components.

[0036] The connecting portion 52 has an engaging portion 524 located on the outer wall or upper end surface of the connecting portion 52, and an external tool engages with the engaging portion 524 to screw the connecting portion 52 onto the valve body 11 and restrict its position. The connecting portion 52 is a force-receiving member when a screw connection is made, and for example, its outer contour, i.e., outer peripheral wall, is adapted to receive the force of an assembly tool such as a wrench, and the outer shape of the cross section of the outer contour may be a square, hexagon, plum-shape, or an irregular circle with parallel opposite sides for receiving the force. In this embodiment, the outer contour of the connecting portion 52 is hexagonal, and the outer edge of the opening 61 does not exceed the minimum outer diameter of the connecting portion 52 . The connecting portion 52 may have another structure. For example, a groove may be provided on the upper end surface of the connecting portion 52, and a protrusion structure may be provided on the external jig to engage with the groove structure, thereby connecting the two together with a screw. The lower end surface of the connecting portion 52 abuts against the valve body 11 to limit the lowermost position of the connecting portion 52 relative to the valve body 11 . A sealing member is provided between the connecting portion 52 and the valve body 11, or a sealing member is provided between the plastic member 51 and the valve body 11.

[0037] 22, in one modification of the present embodiment shown in FIGS. 16 and 17, a recess 514 is further provided in plastic member 51, and this recess 514 is arranged opposite opening 61 so that they are not in contact with each other. Recess 514 is recessed in a direction away from the engagement portion between opening 61 and connecting portion 52, and by arranging recess 514 when opening 61 and connecting portion 52 are welded together, the heat transferred to plastic member 51 during welding can be reduced, and the thermal effect of welding on the injection-molded member can be improved.

[0038] The electric valve further includes a sealing member 155, and the sleeve positioning portion 513 has a second groove 1551. The sealing member 155 is positioned in the second groove 1551 and is pressed between the inner peripheral wall of the sleeve 6 and the inner wall forming the second groove 1551. By providing the sealing member 155, it is possible to avoid adverse effects that may occur when the welding point between the opening 61 of the sleeve 6 and the connecting portion 52 is not completely sealed.

[0039] For a partial structure of this embodiment, the description of the first embodiment above may be referred to.

[0040] 23 to 25, a motor-operated valve according to a third embodiment is shown, and the sleeve 6 includes a sleeve body 62 in the same manner as in the motor-operated valve according to the second embodiment. The opening 61 and the sleeve body 62 are of an integral structure, the opening 61 is located below the sleeve body 62, the sleeve body 62 is arranged equidiametrically, the minimum outer diameter of the opening 61 is equal to the outer diameter of the sleeve body 62, and the opening 61 expands in diameter from top to bottom along the axial direction of the electric valve, in other words, it expands in diameter downward. The opening 61 includes a first lower end surface 611, which is brought into contact with the upper end surface portion 521 and fixed thereto by laser welding. By arranging the opening 61 and the connecting portion 52 in this manner, the heat transferred to the plastic member 51 during welding can be reduced, improving the thermal effect of welding on the injection molded member. A recess 514 may also be provided. For other structures of this embodiment, please refer to the descriptions of the above embodiments.

[0041] Referring to FIG. 26, in the motor-operated valve of the fourth embodiment shown in FIGS. 23 to 25, the sleeve 6 includes a sleeve main body 62 in the same manner as in the motor-operated valve of the second embodiment. The opening 61 and the sleeve body 62 are an integral structure, the opening 61 is located below the sleeve body 62, the sleeve body 62 is arranged equidiametrically, the outer diameter of the opening 61 is larger than the outer diameter of the sleeve body 62, and the opening 61 and the sleeve body 62 are arranged parallel to each other. Here, this parallel includes approximately parallel, and specifically, in this embodiment, the opening 61 includes a radial extending portion 612 and an axial extending portion 613, the radial extending portion 612 is located between the axial extending portion 613 and the sleeve main body 62, the outer diameter of the axial extending portion 613 is larger than the outer diameter of the radial extending portion 612, and the axial extending portion 613 and the sleeve main body 62 are arranged parallel to each other. The opening 61 is brought into contact with the connecting portion 52 and fixed by laser welding. By arranging the opening 61 of the sleeve 6 in this manner, the heat transferred to the plastic member 51 during welding is reduced, improving the thermal effect of welding on the injection molded member. Of course, a recess 514 may also be arranged. For other structures of this embodiment, please refer to the descriptions of the above embodiments.

[0042] The motor-operated valve of the fifth embodiment shown in FIGS. 27 to 33 includes a valve member 12 and a valve body 11, and the valve member 12 can be attached to the valve body 11. The valve member 12 includes a nut unit 5 and a sleeve 6 . The nut unit 5 includes a plastic member 51 and a connecting portion 52, and the connecting portion 52 is fixed to the plastic member 51 by a fixing method including injection molding fixing, fastening, bonding, or a combination of fastening and bonding. In this embodiment, the plastic member 51 covers a part of the connection portion 52, and the sleeve 6 is fixedly connected to the connection portion 52. The fixed connection method includes welding, adhesive bonding, etc., and the welding method is, for example, laser welding or brazing. The connection portion 52 in this embodiment is provided with a stepped structure for engaging with the sleeve 6. Of course, for the connection method between the connection portion 52 and the sleeve 6, please refer to the electric valves of the second to fourth embodiments. The valve member 12 further comprises a connection structure 7 molded or connected to the connection portion 52 , by which the valve member 12 is fixedly connected to the valve body 11 . The connecting structure 7 is molded or connected to the connecting portion 52 , and the valve member 12 is fixedly connected to the valve body 11 by the connecting structure 7 . By arranging the components in this manner, the connection structure of the motor-operated valve and the valve member can be simplified, and processing costs can be reduced. In this embodiment, the valve member 12 as a whole is fixedly connected to the valve body 11 by the connecting portion 52, and by arranging it in this manner, it contributes to the structure of the motor-operated valve, reduces the number of components of the motor-operated valve, and simplifies the installation of the motor-operated valve. For some of the structure of this embodiment, it is sufficient to refer to or learn from the descriptions of the above embodiments. For example, for welding the sleeve 6 and the connecting portion 52, it is sufficient to refer to the motor-operated valves of the second to fourth embodiments. The sharable structures of each embodiment may be used in combination.

[0043] In this embodiment shown in Figures 27 to 33, the plastic member 51 covers the inner part of the connecting portion 52, and the material of this connecting portion 52 is a metal material, for example, a stainless steel material, and the plastic member 51 is formed by injection molding using the connecting portion 52 as an injection molding insert.In other words, the nut unit 5 or a part of the nut unit 5 is formed by injection molding using the connecting portion 52 as an injection molding insert, and the plastic member 51 is formed by injection molding, and the connecting portion 52 has a fixing reinforcement portion 523, and this fixing reinforcement portion 23 is located in the inner part of the connecting portion 52, and at least a part of it is covered by the plastic member 51. The plastic member 51 is specifically a special engineering plastic or composite material having a certain strength, such as a mechanically reinforced polyetheretherketone material (PEEK) or a modified polyetheretherketone material (PEEK), or a mechanically reinforced polyphenylene sulfide (PPS) or a modified polyphenylene sulfide (PPS) material. The plastic member 51 in this embodiment has a one-piece structure and is injection molded as a single piece. In other configurations, the plastic member 51 may be a separately molded structure, with a fixed or position-limited connection forming the plastic member 51 . In this embodiment, the portion of the connection portion 52 that is connected to the plastic member 51 has a fixed reinforcement portion 523 that is located on the inner side of the connection portion 52, and at least a portion of the fixed reinforcement portion 523 is covered by the plastic member 51. For example, the inner periphery of the connection portion 52 as a fixed reinforcement structure may be a non-circular structure, and the inner shape of the inner wall cross section may be, for example, a square, a hexagon, or an irregular circle or plum shape having some straight sides. By arranging it in this manner, the connection strength between the connecting portion 52 and the plastic member 51 can be improved, and compared to the case where the side wall of the connecting portion 52 has a circular structure, the connecting portion 52 can be prevented from rotating circumferentially relative to the plastic member 51, thereby improving the connection strength. In other embodiments, the fixing reinforcement structure may be formed on the inner circumference of the connection portion 52 with a groove structure, a protrusion structure, or a structure that can achieve similar functions, such as a knurled structure, or the fixing reinforcement structure may be formed in the axial direction with a through hole, or a groove, protrusion, knurled structure, or the like, or may be arranged in combination with the fixing reinforcement structure provided in the circumferential direction.

[0044] The connection structure 7 in this embodiment includes a first male thread portion 71 located on the outer peripheral wall of the connection portion 52. The valve body 11 includes a valve body chamber 115 , and at least a portion of the connection portion 52 is located in the valve body chamber 115 . The wall that forms this valve body chamber 115 is provided with a first female thread portion 72 that corresponds to the first male thread portion 71, and the connection portion 52 and the valve body 11 are fixed by threaded engagement. By arranging the valve member 12 in this manner, the attachment of the valve member 12 to the valve body 11 can be simplified, and the structure of the valve member 12 can be simplified, allowing the number of components to be reduced. The connecting portion 52 further includes an engaging portion 524, which is a groove formed in the connecting portion 52, the opening of which is located on the upper wall of the connecting portion 52, and an external tool engages with the engaging portion 524 to screw and fix the connecting portion 52 to the valve body 11. The external tool is, for example, a jig with a protrusion, and the protrusion of this jig fits into the groove on the upper side of the connecting portion 52, and the jig rotates the connecting portion 52 to threadably engage it with the valve body 11, thereby screwing the valve member 12 to the valve body 11 and fixing it. By arranging the valve member 12 and the valve body 11 in this manner, the assembly of the valve member 12 and the valve body 11 is facilitated, the mounting structure is simplified, and the processing and molding of the connecting portion 52 is also facilitated. The lower end of the connecting portion 52 abuts against the valve body 11, limiting the lowest position of the connecting portion 52 relative to the valve body 11. In this embodiment, the valve body 11 is provided with a staircase structure, and the connecting portion 52 is located in a groove formed by the staircase structure and abuts against the bottom wall of the staircase structure.

[0045] In another embodiment, the engagement portion 524 is an engagement edge 4161 formed on the upper side of the first male thread portion 71. For example, the lower side of the outer peripheral wall of the connecting portion 52 is the first male thread portion 71, and the upper side is the engaging edge 4161, which is a force-receiving structure when the screws are connected and is applied to the application force of an assembly tool such as a wrench, and the external shape of the cross section of the external contour may be a square, hexagon, plum shape, or an irregular circle with parallel opposing sides for receiving the force. The engaging side 4161 in this embodiment is hexagonal and serves as a force application point for an assembly tool such as a wrench. By arranging them in this manner, it is possible to similarly facilitate the assembly of the valve member 12 and the valve body 11, and to simplify the mounting structure.

[0046] The valve member 12 in this embodiment includes a valve seat portion 43, which has a valve port 441, and the valve seat portion 43 and the nut unit 5 are threadedly engaged, or are interference-fitted, or are threadedly engaged and bonded, or are interference-fitted and bonded. Specifically, the second to fourth embodiments of the motor-operated valve may be referred to. Of course, in other embodiments, the valve body portion 11 may be fixed to the connecting portion 52 by welding, and the compatible structures of each embodiment may be combined and used.

[0047] The connection structure 7 for an electric valve of the sixth embodiment shown in Figures 34 to 38 differs from the electric valve of the fifth embodiment in that it has a substantially columnar connecting member 74, the connecting portion 52 has a communicating hole 75 which penetrates the connecting portion 52 along the axial direction of the electric valve, the connecting member 74 has a male thread engaging portion 741, the upper end of the valve body 11 has a connecting hole 76 which opens toward the connecting portion 52, the wall which forms this connecting hole 76 has a female thread engaging portion 742 which engages with the male thread engaging portion 741, when attached, the communicating hole 75 and the connecting hole 76 are arranged coaxially, the connecting member 74 passes through the communicating hole 75 and is screwed into the connecting hole 76 by threaded engagement to fix the connecting portion 52 to the valve body 11, and at least a portion of the connecting member 74 is located in the communicating hole 75, and at least a portion of the connecting member 74 is located in the connecting hole 76. The upper end of the connecting member 74 is provided with a flange, the outer diameter of which is larger than the outer diameter of the connecting hole 76, so that the flange cannot pass through the connecting hole 76, and the lower end of the connecting portion 52 abuts against the valve body 11, limiting the lowest position of the connecting portion 52 relative to the valve body 11. For other structures of this embodiment, please refer to the descriptions of the above embodiments. The connecting members 74 include screws, bolts or similar structures, and the number of connecting members 74 corresponds to the number of communicating holes 75, with both being two or more, and the communicating holes 75 being uniformly arranged around the outer periphery of the connecting portion 52. In this embodiment, the number of connecting members 74, communicating holes 75 and connecting holes 76 is four, which can improve the reliability of the connection. The connecting member 74 is used as the connecting structure 7 to fix the connecting portion 52 to the valve body 11, which similarly facilitates assembly of the valve member 12 and the valve body 11 and simplifies the mounting structure. In other embodiments, the connecting member 74 does not have a male thread engaging portion 741, and a portion of the connecting member 74 is positioned in the connecting hole 76 of the valve body 11 and is tightly fitted into this connecting hole 76 to fix the valve member 12 to the valve body 11.

[0048] The connection structure 7 in another embodiment of the electric valve is, compared to the electric valve of the fifth embodiment, a ring-shaped connection member 74, the connection member 74 having a male thread engagement portion 741, the wall forming the valve body chamber 115 having a female thread engagement portion 742 that engages with the male thread engagement portion 741, the valve body 11 having a first step portion 77, the lower end of the connection portion 52 abutting against the first step portion 77, the connection member 74 and the valve body 11 being fixed by thread engagement, and the lower end of the connection member 74 abutting against the upper end of the connection portion 52. The connecting portion 52 is then restricted in position so as to be crimped between the connecting portion 52 and the valve body 11 , thereby restricting the position of the valve seat portion 43 to the valve body 11 . By arranging the valve member 12 and the valve body 11 in this manner, it is possible to similarly facilitate assembly of the valve member 12 and the valve body 11, simplify the mounting structure, and reduce the number of components. In another embodiment, the connecting member 74 does not have a male thread engaging portion 741, but is annular, and the outside of the connecting member 74 is press-fit into the valve body 11, and the inside of the connecting member 74 is press-fit into the connecting portion 52, thereby restricting the position of the connecting portion 52 to the valve body 11.

[0049] The seventh embodiment of the motor-operated valve shown in Figures 39 to 45 includes a nut unit 5, a valve seat unit 4, a valve body unit 122, and a sleeve 6, and the nut unit 5 includes a plastic member 51 and a connecting portion 52. The connecting portion 52 is fixed to the plastic member 51 by a fixing method including injection molding fixing, or fastening, or bonding, or a combination of fastening and bonding. The connecting portion 52 in this embodiment is used as an injection molding insert to form the nut unit 5 or a part of the nut unit 5 by injection molding, and the plastic member 51 covers a part of the connecting portion 52, for example, covers the inner part of the connecting portion 52 in this embodiment. In this embodiment, the material of the connection part 52 is a metal material, the material of at least a part of the structure of the valve seat unit 4 is a metal material, the material of the sleeve 6 is a metal material, for example, a stainless steel material, and the sleeve 6 is fixedly connected to the connection part 52, and this fixed connection method includes welding. The plastic member 51 is specifically a special engineering plastic or composite material having a certain strength, such as a mechanically reinforced polyetheretherketone material (PEEK) or a modified polyetheretherketone material (PEEK), or a mechanically reinforced polyphenylene sulfide (PPS) or a modified polyphenylene sulfide (PPS) material. The plastic member 51 in this embodiment has a one-piece structure and is injection molded as a single piece. In other configurations, the plastic member 51 may be a separately molded structure, with a fixed or position-limited connection forming the plastic member 51 . In this embodiment, the portion of the connection part 52 that is connected to the plastic member 51 has a fixing reinforcement part 523, which is located on the inside of the connection part 52 and at least a part of which is covered by the plastic member 51. For example, the inner periphery of the connection part 52 has a non-circular structure, and for example, the inner shape of the inner wall cross section may be a rectangle, a hexagon, an irregular circle with some straight sides, or a plum shape, etc. By arranging it in this manner, the connection strength between the connection part 52 and the plastic member 51 can be improved. Compared to the case where the connecting portion 52 has a side wall with a circular structure, the connecting portion 52 can be prevented from rotating in the circumferential direction relative to the plastic member 51. In other embodiments, the inner circumference of the connecting portion 52 may be machined with a structure that can achieve similar functions, such as a groove structure, a protrusion structure, or a knurling, or in the axial direction, a through-hole, a groove, a protrusion, or other structure may be machined, or the above structures may be combined and arranged.

[0050] 39 to 45, the valve seat unit 4 in this embodiment includes a valve port portion 44, which is provided with a valve port 441, and the motor-operated valve further includes a valve body unit 122. The valve body unit 122 can engage with the valve port 441 to adjust the opening degree of the valve port 441, and the connection portion 52 includes a lower end surface portion 522 located on the lower wall of the connection portion 52, and the lower end surface portion 522 includes a flat surface. For example, the entire lower end surface portion 522 is flat, or most of it is flat, but at least the portion where it is connected to the valve seat unit 4 is flat, and the flat surface of the present invention may have a certain degree of roughness. The valve seat unit 4 includes a first end portion 47, which is made of a metal material, and the first end portion 47 abuts against the lower end surface portion 522 and is connected thereto by welding. The sleeve 6 is fixed and connected to the connecting portion 52, and the first end 47 of the valve seat unit 4 is welded and fixed to the lower end surface portion 522, so there is no need to separately process an engagement structure for the engagement portion between the valve seat unit 4 and the connecting portion 52, and the processing cost of the valve seat unit can be reduced. By arranging them in this manner, the structure of each member can be simplified, and processing costs can be reduced. In this embodiment, the lower end surface portion 522 is located on the lower wall of the connection portion 52, and at least a portion of the lower end surface portion 522 is located outside the first end portion 47 along the radial direction of the electric valve, and the lower end surface portion 522 is fixed to the connection portion 52 by laser welding. By arranging the lower end of the connection portion 52 as a flat surface, the processing of the connection portion 52 can be simplified, and the processing cost can be reduced. Referring to the electric valve of the second embodiment, this embodiment can be combined with the second embodiment, and the entire upper end surface portion 521 of the connecting portion 52 may be flat, and the entire lower end surface portion 522 may also be flat. By arranging the connecting portion 52 in this manner, the processing of the connecting portion 52 is facilitated. For example, the connecting portion 52 can be processed and formed by a method such as pressing, forging, or warm upset forging, thereby reducing or eliminating the machining step of the connecting portion 52, and also reducing the height of the connecting portion 52, thereby further reducing the overall height of the electric valve.

[0051] 39 to 45, the valve seat unit 4 in this embodiment includes a first valve seat portion 41, and the first valve seat portion 41 includes a first main body 48 and the first end portion 47 as an integral structure. The first end 47 is located above the first main body 48, abuts against the lower end surface 522, and is fixed by laser welding. The distance between the outer edge of the first end 47 and the outer edge of the lower end surface 522 along the radial direction of the electric valve is 0.4 mm or more, and the first end 47 is laser welded to the connection portion 52. In this embodiment, the first end 47 is positioned so that its diameter is equal to the inner diameter and outer diameter of the first main body 48, and is positioned perpendicular to the lower end surface portion 522 (perpendicular position includes approximately perpendicular position), and is connected by laser welding. The welding surface in this embodiment forms the sealing surface. For some structures of this embodiment, the description of the above embodiments can be referred to or learned, and the common structures of the respective embodiments may be combined and used.

[0052] 39 to 45, the lower end surface portion 522 in this embodiment is flat, and the distance between the outer edge of the first end portion 47 and the outer edge of the lower end surface portion 522 along the radial direction of the electric valve is 0.4 mm or more, and the first end portion 47 is laser welded to the connection portion 52. This arrangement provides a good welding penetration depth and improves the welding quality of the welded portion. To provide a better welding effect, the distance from the outer edge of the first end portion 47 to the outer edge of the lower end surface portion 522 is 0.5 mm or more. The welding surface in this embodiment simultaneously seals the gap between the sleeve 6 and the connecting portion 52 .

[0053] 39 to 45, the lower end surface portion 522 in another embodiment is flat, and the outer edge of the lower end surface portion 522 includes a first edge 5211 and a second edge 5212. The outer diameter of the second edge 5212 is larger than the outer diameter of the first edge 5211, and in this embodiment the first edge 5211 is the smallest outer diameter point of the outer edge of the lower end surface portion 522, and the second edge 5212 is the largest outer diameter point of the outer edge of the lower end surface portion 522, the outer edge of the first end 47 does not exceed the first edge 5211, the distance between at least a part of the outer edge of the first end 47 and the second edge 5212 is 0.4 mm or more, and the first end 47 is laser welded to the connection portion 52. The outer edge of the connecting portion 52, i.e., the lower end surface portion 522, may not be a regular circle, but may be, for example, hexagonal or approximately hexagonal, and is limited by the radial size of the connecting portion 52, so that the outer edge of a portion of the first end 47 is allowed to be aligned or nearly aligned with the outer edge of the connecting portion 52, but not exceed the outer edge of the connecting portion 52, i.e., the outer edge of the first end 47 does not exceed the first edge 5211, but the distance between the outer edge of at least a portion of the first end 47 and the second edge 5212 is 0.4 mm or more. For example, the connecting portion 52 in the above embodiment includes an engagement portion 524 located on the outer periphery of the connecting portion 52, and this engagement portion 524 is generally hexagonal, i.e., the outer edge of the connecting portion 52 is generally hexagonal, allowing the outer edge of a portion of the first end 47 to be aligned or nearly aligned with the outer edge of the small diameter portion of the connecting portion 52, but not exceeding the outer edge of the connecting portion 52. The welding surface in this embodiment simultaneously seals the gap between the sleeve 6 and the connecting portion 52 . In this embodiment, the distance between the outer edge of the first end portion 47 and the first edge 5211 is 0.4 mm or more.

[0054] 39 to 45, the plastic member 51 of the nut unit 5 in this embodiment includes a main body portion 511 and a nut portion 512. As shown in FIG. The main body portion 511 includes a valve seat positioning portion 5113, the valve seat unit 4 includes a storage portion 46, the storage portion 46 has a storage chamber 461, the valve seat positioning portion 5113 is located in the storage chamber 461 and abuts against the inner wall of the first valve seat portion 41, and the valve seat positioning portion 5113 limits the radial position of the first valve seat portion 41 and further limits the radial position of the positioning portion relative to the connection portion 52. The valve seat positioning portion 5113 in this embodiment includes several recesses 5114, and by arranging these recesses 5114, the weight of the plastic member 51 can be reduced. Referring to the electric valve of the second embodiment, the plastic member 51 is provided with a recess 514, or the first end 47 is relatively expanded outward, which reduces the heat transferred to the plastic member 51 during welding and improves the thermal effect of welding on the injection-molded member. The first valve seat portion 41 in this embodiment is tightly fitted into the valve seat positioning portion 5113, which improves the positioning accuracy and further improves the coaxiality of the motor-operated valve. In other embodiments, an external tool may be used to position the valve seat unit 4 .

[0055] 39 to 45, the valve seat unit 4 in this embodiment further includes a second valve seat portion 42, which is spaced apart from the connecting portion 52 relative to the first valve seat portion 41 along the axial direction of the motor-operated valve, and the valve port portion 44 is located at the second valve seat portion 42. The first valve seat portion 41 and the second valve seat portion 42 are of an integral structure, and the valve seat unit 4 is integrally machined and formed by a warm upset forging process, or the valve seat unit 4 is machined and formed by performing a warm upset forging process on the valve seat unit 4 to form the main body portion of the valve seat unit 4, and then machined to combine the side hole 45, the groove or the valve port 441, etc. By arranging the valve seat unit 4 in this manner, it is possible to easily form the valve seat unit 4, and to reduce the amount of consumables required for processing, thereby reducing costs, compared to processing and forming using a complete machining process. In one variation of this embodiment, the valve seat unit 4 is formed by a metal drawing process, or the valve seat unit 4 is subjected to a metal drawing process to form the main body of the valve seat unit 4, and the side holes 45, grooves or valve ports 441 are machined in combination. This arrangement also facilitates the formation of the valve seat unit, and reduces the amount of processing consumables and costs compared with machining. Metal drawing processes include processes such as drawing, pressing, etc.

[0056] 39 to 45, the motor-operated valve of this embodiment further includes a valve body 11, the valve body 11 having a valve body chamber 115, at least a portion of the valve seat unit 4 being located in the valve body chamber 115, the first valve seat portion 41 having a first male thread 85, the wall forming the valve body chamber 115 having a first female thread 86 that engages with the first male thread 85, and the valve seat unit 4 and the valve body 11 being fixed by threaded engagement. Regarding the method of connecting the valve seat unit 4 or the nut unit 5 to the valve body 11, it is sufficient to refer to the above embodiment. For example, a first male thread 85 is provided on the outer periphery of the connection part 52, and a first female thread 86 is provided on the valve body 11, and the two are screw-connected and fixed.

[0057] 39 to 45, the electric valve of this embodiment has a balance passage 15, which includes a valve seat positioning portion 5113 or a recessed groove formed from the first valve seat portion 41, a through hole that penetrates the connecting portion 52 along the axial direction, and a through hole that penetrates the plastic member 51 along the axial direction. The balancing passage 15 connects the chamber formed by the valve seat unit 4 with the chamber formed by the sleeve 6 . The balance holes 14 may be injection molded or may be machined later.

[0058] The valve seat unit 4 in this embodiment further includes a side hole 45 located above the valve opening portion 44, and the motor-operated valve further includes a first sealing member and a second sealing member. The first sealing portion is located between the connecting portion 52 and the valve body 11, or between the first valve seat portion 41 and the valve body 11, and the second sealing member is located between the second valve seat portion 42 and the valve body 11, or the connecting portion 52 is connected to the valve body 11. The above embodiment may be referred to for the functions of the first sealing member and the second sealing member. When both the first sealing member and the second sealing member are located in the valve seat unit, the valve member can be connected to the valve body as a whole.

[0059] Referring to Figure 46, in another modification of the motor-operated valve of the seventh embodiment shown in Figure 40, the first valve seat portion 41 and the second valve seat portion 42 have separate structures, are molded separately, and are fixedly connected or connected so as to be positionally restricted. The first valve seat portion 41 is integrally formed by processing using a warm upset forging process, or by processing using a metal tensioning process, or by processing using a combination of a warm upset forging process and machining, or by processing using a combination of a metal tensioning process and machining, and the second valve seat portion 42 and the first valve seat portion 41 are fixed together by welding, bonding, or interference fit, or by a combination of interference fit and bonding. By arranging the valve seat unit 4 in this manner, it is possible to easily form a part of the valve seat unit 4, and compared to machining, it is possible to reduce the amount of consumables required for machining and reduce costs. In this embodiment, the second valve seat portion 42 has a staircase 422, which includes a staircase bottom surface 4221 and a staircase side surface 4222. The bottom end of the first valve seat portion 41 abuts against the staircase bottom surface 4221, and the inner wall of the first valve seat portion 41 abuts against the staircase side surface 4222, thereby limiting the radial position of the first valve seat portion 41 relative to the second valve seat portion 42. The second valve seat portion 42 is made of a metal material, or the main body portion of the second valve seat portion 42 is made of a resin material and the valve port is made of a metal material.

[0060] The electric valve of this embodiment further includes a second sealing member 152, the lower end of which is abutted against the connecting portion 52, and the second sealing member 152 is pressed between the injection molded body 132 and the sleeve 6. By arranging the second sealing member 152, it is possible to prevent external water vapor or harmful substances from entering the gap between the sleeve 6 and the coil unit 13 and corroding the coil unit 13 or other components, thereby improving the service life and reliability of the electric valve.

[0061] In this embodiment, the coil unit 13 includes a block 134 that encases the pin terminals (not shown) of the coil unit, one end of which is connected to the lead wire of the coil winding of the coil unit 13, and the other end of which is connected to the electronic control board 135. The coil unit further includes a groove 136 located in the block 134. In this embodiment, the groove 136 is elongated along the radial direction, extends approximately vertically, and is recessed inward from the outer circumferential surface of the block 134. In other embodiments, the groove 136 may have other shapes to achieve the same function.

[0062] For other structures of this embodiment, please refer to the descriptions of the above embodiments. The usable structures of each embodiment fall within the protection scope of the present invention.

[0063] Here, the above examples are used to explain the present invention, not to limit the present invention, and the present specification has already described the present invention in detail with reference to the above examples, but amendments or equivalent replacements may be made to the present invention, and all improvements that do not deviate from the spirit and scope of the present invention should fall within the scope of the claims of the present invention.

Claims

1. An electrically operated valve including a nut unit (5), a valve seat unit (4) and a sleeve (6), The nut unit (5) includes a plastic member (51) and a connecting portion (52), The connecting portion (52) is fixed to the plastic member (51), The material of the connection portion (52) is a metal material, The sleeve (6) is fixedly connected to the connection part (52), The connection portion (52) includes a lower end surface portion (522), The valve seat unit (4) includes a first end (47), the material of the first end (47) is a metal material; The motor-operated valve is characterized in that the first end (47) is welded and fixed to the lower end surface portion (522).

2. The lower end surface portion (522) is located on the lower wall of the connection portion (52), At least a portion of the lower end surface portion (522) is located outside the first end portion (47) along the radial direction of the motor-operated valve, 2. The motor-operated valve according to claim 1, wherein the lower end surface portion (522) is fixed to the connecting portion (52) by laser welding.

3. The lower end surface portion (522) is a flat surface, The distance between the outer edge of the first end portion (47) and the outer edge of the lower end surface portion (522) along the radial direction of the electric valve is 0.4 mm or more, 3. The motor-operated valve according to claim 2, wherein the first end (47) is laser welded to the connecting portion (52).

4. The lower end surface portion (522) is a flat surface, The outer edge of the lower end surface portion (522) includes a first edge (5211) and a second edge (5212), The outer diameter of the second edge (5212) is larger than the outer diameter of the first edge (5211), The outer edge of the first end (47) does not extend beyond the first edge (5211); The distance between at least a part of the outer edge of the first end (47) and the second edge (5212) is 0.4 mm or more; 3. The motor-operated valve according to claim 2, wherein the first end (47) is laser welded to the connecting portion (52).

5. The nut unit (5) includes a valve seat positioning portion (5113), The valve seat unit (4) includes a storage section (46), The storage section (46) comprises a storage chamber (461), An electric valve as described in any one of claims 2 to 4, characterized in that the valve seat positioning portion (5113) is located in the storage chamber (461) and abuts against the wall of the storage portion (46).

6. The valve seat unit (4) further includes a second valve seat portion (42), The second valve seat portion (42) is spaced apart from the connecting portion (52) relative to the first valve seat portion (41) along the axial direction of the motor-operated valve, The valve orifice portion (44) is located on the second valve seat portion (42), The first valve seat portion (41) and the second valve seat portion (42) have an integral structure, 6. The motor-operated valve according to claim 5, wherein the valve seat unit (4) is integrally formed by a warm upset forging process, or by a metal tensioning process, or by a combination of a warm upset forging process and machining, or by a combination of a metal tensioning process and machining.

7. The valve seat unit (4) further includes a second valve seat portion (42), The second valve seat portion (42) is spaced apart from the connecting portion (52) relative to the first valve seat portion (41) along the axial direction of the motor-operated valve, The second valve seat portion (42) has a valve opening portion (44), The valve port portion (44) includes a valve port (441), The first valve seat portion (41) and the second valve seat portion (42) have separate structures, 6. The motor-operated valve according to claim 5, wherein the first valve seat portion (41) and the second valve seat portion (42) are connected in a fixed or positionally limited manner.

8. the first valve seat portion (41) is integrally formed by a warm upset forging process, or is formed by a metal tensioning process, or is formed by a combination of a warm upset forging process and a machining process, or is formed by a combination of a metal tensioning process and a machining process; The motor-operated valve according to claim 7, characterized in that the second valve seat portion (42) and the first valve seat portion (41) are fixed to each other by welding, adhesive, or interference fit, or by a combination of interference fit and adhesive.

9. The motor-operated valve further includes a valve body (11), The valve body (11) includes a valve body chamber (115), At least a portion of the valve seat unit (4) is located in the valve body chamber (115), The first valve seat portion (41) is provided with a first male thread (85), The wall forming the valve body chamber (115) has a first female thread (86) that engages with the first male thread (85); The valve seat unit (4) and the valve body (11) are fixed together by threaded engagement. The motor-operated valve according to any one of claims 6 to 8, wherein a lower end surface (522) of the connecting portion (52) abuts against the valve body (11).

10. The valve seat unit (4) further includes a side hole (45) located above the valve opening portion (44), The electrically operated valve further includes a first sealing member and a second sealing member; the first sealing member is located between the connection portion (52) and the valve body (11) or between the first valve seat portion (41) and the valve body (11); 10. The motor-operated valve according to claim 9, wherein the second sealing member is located between the second valve seat portion (42) and the valve body (11).

11. The motor-operated valve comprises a balancing passage (15); the balance passage (15) includes a recessed groove formed from the valve seat positioning portion (5113) or the first valve seat portion (41), a through hole passing through the connecting portion (52) along the axial direction, and a through hole passing through the plastic member (51) along the axial direction; 11. The motor-operated valve according to claim 10, wherein the balancing passage (15) connects a chamber formed by the valve seat unit (4) with a chamber formed by the sleeve (6).

12. The motor-operated valve further includes a coil unit (13); The coil unit (13) includes a stator unit (131) and an injection molded body (132), The electrically operated valve further includes a second sealing member (152); The lower end of the second sealing member (152) abuts against the connecting portion (52), 12. The motor-operated valve according to claim 10 or 11, wherein the second sealing member (152) is crimped between the injection molded body (132) and the sleeve (6).

13. The sleeve (6) includes an opening (61), The connection portion (52) includes an upper end surface portion (521), The opening (61) is welded and fixed to the upper end surface portion (521), An electric valve as described in any one of claims 1 to 4, characterized in that at least a portion of the upper end surface portion (521) is located outside the opening (61) along the radial direction of the electric valve.

14. The upper end surface portion (521) is located on the upper surface of the connection portion (52), The upper end surface portion (521) is a flat surface, The distance between the outer edge of the opening (61) and the outer edge of the upper end surface portion (521) along the radial direction of the motor-operated valve is 0.4 mm or more, 14. The motor-operated valve according to claim 13, wherein the opening (61) is laser-welded to the connection part (52).

15. The upper end surface portion (521) is located on the upper surface of the connection portion (52), The upper end surface portion (521) is a flat surface, The outer edge of the upper end surface portion (521) includes a first edge (5211) and a second edge (5212), The outer diameter of the second edge (5212) is larger than the outer diameter of the first edge (5211), The outer edge of the opening (61) does not exceed the first edge (5211), The distance between at least a part of the outer edge of the opening (61) and the second edge (5212) is 0.4 mm or more; 14. The motor-operated valve according to claim 13, wherein the opening (61) is laser-welded to the connection part (52).

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