Electric valve and electric valve assembly method

Abstract

The present invention discloses an electric valve, including a nut component including a nut, a rotor component including a rotor and a screw rod, the nut and the screw rod being threadedly connected, the valve core component including a valve sleeve and a valve core, the valve sleeve is roughly cylindrical, the valve sleeve is movably connected to the screw rod, the screw rod can drive the valve sleeve to move axially, the valve sleeve is fixedly connected to the valve core, the valve core can abut or separate from the sealing part of the valve seat component, the valve sleeve includes a sliding fitting part, the sliding fitting part includes a first sliding part and a second sliding part, the outer diameter of the first sliding part is smaller than the outer diameter of the second sliding part, the nut includes a guide hole section, the guide hole section includes a small hole section and a large hole section, the inner hole of the small hole section is roughly circular, the inner hole of the large hole section is roughly circular, the inner diameter of the small hole section is smaller than the inner diameter of the large hole section, the reliability of the electric valve closing is improved, and the present application also provides an assembly method of the electric valve.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, in particular to an electric valve and an assembly method of the electric valve. Background Art

[0002] In the field of fluid control technology, such as refrigeration technology, electric valves can be used to cut off or regulate refrigerant or adjust the compressor suction pressure. Figure 8 The figure shows a structural diagram of an electric valve in the background art; Figure 9 Shown Figure 8 Exploded view of the valve core components. Figure 8 and Figure 9 As shown, the electric valve includes a motor component 01, a connector 02, a valve core component 03, and a valve body component 04. The valve core component 03 includes a screw sleeve 031, a valve core body 032, a valve head assembly, and a preload spring 034. The valve head assembly 034 includes a valve head connecting rod 0331, a valve head 0332, a sealing gasket 0333, and a threaded retaining ring 0334. The screw sleeve 031 is connected to the screw 011, which is threadedly fixed to the valve core body 032. The valve head connecting rod 0331 is installed in the valve core body 032. The threaded retaining ring 0334 is threadedly fixed to the valve head connecting rod 0331. The sealing gasket 0333 is sleeved on the valve head connecting rod 0331 and is axially limited by the threaded retaining ring 0334. The valve head 0332 is threadedly connected to the valve head connecting rod 0331, and the threaded retaining ring 0334 compresses the sealing gasket 0333. The electric valve core component 03 is threadedly connected to the nut 011. The valve core component 03 can slide relative to the inner wall of the connector 02. There is a risk that the valve core component 03 gets stuck and affects the closing reliability of the electric valve. Summary of the Invention

[0003] The purpose of the present application is to provide an electric valve that can improve the valve closing reliability of the electric valve.

[0004] The electric valve includes a valve body component, a valve seat component, a nut component, a rotor component and a valve core component, the nut component is fixedly connected to the valve body component, the rotor component can drive the valve core component to move axially along the valve body component, the nut component includes a nut, the rotor component includes a rotor and a screw rod, the nut is threadedly connected to the screw rod, the valve core component includes a valve sleeve and a valve core, the valve sleeve is roughly cylindrical, the valve sleeve is movably connected to the screw rod, the screw rod can drive the valve sleeve to move axially, the valve sleeve is fixedly connected to the valve core, and the valve core can move axially with the valve seat The sealing parts of the components abut or separate, the valve sleeve includes a sliding fitting part, the sliding fitting part includes a first sliding part and a second sliding part, the outer diameter of the first sliding part is smaller than the outer diameter of the second sliding part, the nut includes a guide hole section, the guide hole section includes a small hole section and a large hole section, the inner hole of the small hole section is roughly a circular hole, the inner hole of the large hole section is roughly a circular hole, the inner diameter of the small hole section is smaller than the inner diameter of the large hole section, the outer wall of the first sliding part can be slidably fitted with the inner wall clearance of the small hole section, and the outer wall of the second sliding part can be slidably fitted with the inner wall clearance of the large hole section.

[0005] The electric valve of this scheme, the valve core component includes a valve sleeve and a valve core, the valve sleeve is roughly cylindrical, the valve sleeve is movably connected to the screw rod, the valve core can abut or separate from the sealing part of the valve seat component, the valve sleeve includes the sliding fitting part, the sliding fitting part includes a first sliding part and a second sliding part, the outer diameter of the first sliding part is smaller than the outer diameter of the second sliding part, the nut includes a guide hole section, the guide hole section includes a small hole section and a large hole section, the inner hole of the small hole section is roughly circular, the inner hole of the large hole section is roughly circular, the inner diameter of the small hole section is smaller than the inner diameter of the large hole section, the outer wall of the first sliding part can slide with the inner wall clearance of the small hole section, the outer wall of the second sliding part can slide with the inner wall clearance of the large hole section, which can improve the valve closing reliability of the electric valve.

[0006] The present invention also provides an assembly method of an electric valve capable of achieving the above-mentioned beneficial effects, wherein the electric valve comprises a valve body component, a valve seat component, a nut component, a rotor component and a valve core component, wherein the nut component comprises a nut, the rotor component comprises a rotor, a screw rod and a bearing, the valve core component comprises a valve sleeve, a valve core, a bearing seat and an elastic member, the valve sleeve is roughly cylindrical, the valve sleeve comprises the sliding fitting portion, the sliding fitting portion comprises a first sliding portion and a second sliding portion, the outer diameter of the first sliding portion is smaller than the outer diameter of the second sliding portion, the nut comprises a guide hole section, the guide hole section comprises a small hole section and a large hole section, the inner hole of the small hole section is roughly circular, the inner hole of the large hole section is roughly circular, and the inner diameter of the small hole section is smaller than the inner diameter of the large hole section, and the assembly method comprises the following steps:

[0007] Assembling the screw assembly: fixedly connecting the bearing to the screw;

[0008] Assembling the valve sleeve screw assembly: movably connecting the valve sleeve with the screw assembly d;

[0009] Assemble the valve core screw rod assembly: after the bearing seat and the elastic member are installed in the inner cavity of the valve sleeve, the valve core is fixedly connected to the valve sleeve so that one end of the elastic member abuts against the bearing seat and the other end of the elastic member abuts against the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The figure shows the structure of the electric valve embodiment 1 of the present invention;

[0011] Figure 2 Shown Figure 1 Schematic diagram of the connection structure of some parts in the middle;

[0012] Figure 3 Shown Figure 1 Cross-sectional view of the middle valve sleeve;

[0013] Figure 4 Shown Figure 1 Schematic diagram of the structure of the valve core component;

[0014] Figure 5 The figure shows the connection structure diagram of the valve core component and the screw rod;

[0015] Figure 6 Shown Figure 1 Cross-sectional view of the middle valve core;

[0016] Figure 7 Shown Figure 1 Schematic diagram of the structure of the middle bearing;

[0017] Figure 8 The figure shows a structural diagram of an electric valve in the background art;

[0018] Figure 9 Shown Figure 8 Exploded view of the valve core components. DETAILED DESCRIPTION

[0019] It should be noted that if directional words such as "upper" and "lower" are used in this article, they are defined based on the illustrated positions in the drawings of this specification. It should be understood that the use of the directional words is only for the clarity and convenience of describing the technical solution and should not constitute a limitation on the scope of protection.

[0020] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 The figure shows the structure of the electric valve embodiment 1 of the present invention. Figure 2 Shown Figure 1 Schematic diagram of the connection structure of some parts in the figure. Figure 3 Shown Figure 1 Cross-sectional view of the middle valve sleeve, Figure 4 Shown Figure 1 Schematic diagram of the structure of the valve core components, Figure 5 The figure shows the connection structure diagram of the valve core components and the screw rod, etc. Figure 6 Shown Figure 1 Cross-sectional view of the middle valve core.

[0022] like Figure 1 and Figure 2 As shown, the electric valve includes a valve body component 10, a valve seat component 20, a rotor component 30, a nut component 40 and a valve core component 50. The valve body component 10 includes an upper valve body 11, a lower valve body 12, and a connecting sleeve 13. The lower valve body 12 includes a first connecting port 121, and the first connecting pipe 14 is fixedly connected to the first connecting port 121. The upper valve body 11, the lower valve body 12 and the connecting sleeve 13 are all made of stainless steel. The connecting sleeve 13 is roughly cylindrical and includes a second insert portion 132 located inside the lower valve body 12, a first insert portion 131 located inside the upper valve body 11, and a connecting portion 133 located between the lower end of the upper valve body 11 and the upper end of the lower valve body 12. The first insert portion 131 and the connecting portion 133 together form a first positioning portion, and the second insert portion 132 and the connecting portion 133 together form a second positioning portion.

[0023] As a specific embodiment, Figure 1 and Figure 2 As shown, the outer diameter of the connecting portion 133 is greater than the outer diameter of the second insert portion 132, and the outer diameter of the connecting portion 133 is greater than the outer diameter of the first insert portion 131. Thus, the connecting portion 133 and the first insert portion 131 together form a stepped first positioning portion 1301, and the connecting portion 133 and the second insert portion 132 together form a stepped second positioning portion 1302. The lower end of the upper valve body 11 contacts the connecting portion 133, and the outer wall of the first insert portion 131 forms an interference fit with the inner wall of the upper valve body 11. The upper end of the lower valve body 12 contacts the connecting portion 133, and the outer wall of the second insert portion 132 forms an interference fit with the inner wall of the lower valve body 12. At this point, the mating point between the upper valve body 11 and the connecting portion 133 forms a first welding position, and the upper valve body 11 and the connecting portion 133 are fixed at this first welding position by laser welding or argon arc welding. The lower valve body 12 and the connecting portion 133 form a second welding position at which the lower valve body 12 and the connecting portion 133 are fixed by laser welding, argon arc welding or furnace welding.

[0024] The upper valve body 11 is a stainless steel stretched part, and the lower valve body 12 is a stainless steel stretched part. The upper valve body 11 and the connecting sleeve 13 are positioned by the first positioning part 1301, and the lower valve body 12 and the connecting sleeve 13 are positioned by the second positioning part 1302. This design is convenient for positioning and is beneficial to the coaxial accuracy of the upper valve body 11 and the lower valve body 12, which is also beneficial to improving the matching accuracy between the subsequent valve core 51 and the sealing part of the valve seat component 20.

[0025] like Figure 1 As shown, the valve seat assembly 20 includes a valve seat body 21, a pressure ring 22, a sealing ring 23, and an inner sleeve 24. The valve seat body 21 is welded to the lower valve body 12, the pressure ring 22 is riveted to the valve seat body 21, and the sealing ring 23 is installed between the stepped hole of the valve seat body 21 and the inner sleeve 24. The sealing ring 23 is made of a non-metallic soft material, such as rubber or PTFE, and includes a sealing portion 231. The lower valve body 12 is welded to the valve seat body 21, and the second connecting pipe 25 is welded to the second connecting port 211 of the valve seat body 21.

[0026] The rotor component 30, the nut component 40, and the valve core component 50 are all arranged in the valve cavity. Figure 1 As shown, the rotor component 30 is capable of axial movement relative to the valve body component 10 and includes a rotor 31, a mounting bracket 32, and a screw 33. The mounting bracket 32 ​​is fixedly connected to the rotor 31 and the screw 33. The rotor 31 is loosely fitted with the upper valve body 11, and the screw 33 is drivingly connected to the nut 41 of the nut component 40. Specifically, the external threaded portion of the screw 33 is threadedly engaged with the internal threaded portion of the nut 41. The rotor component 30 is capable of axial movement while rotating circumferentially relative to the nut 41, which is described below.

[0027] like Figure 1 and Figure 2 As shown, the nut assembly 40 further includes a connecting frame 42. The nut 41 is made of plastic, and the connecting frame 42 is made of metal, such as stainless steel. The connecting frame 42 is fixed to the nut 41 by injection molding. The connecting frame 42 includes a first axial channel 421.

[0028] like Figure 2 As shown, the inner wall of the connecting sleeve 13 includes a third positioning portion 1303. The connecting frame 42 of the nut assembly 40 cooperates with the third positioning portion 1303 for pre-positioning. In this embodiment, the third positioning portion 1303 is arranged in a stepped shape. A third welding position is formed between the outer wall of the connecting frame 42 and the inner wall of the connecting sleeve 13. The connecting frame 42 and the connecting sleeve 13 are fixed by laser welding or argon welding, or by riveting. It should be noted that the third positioning portion 1303 is not provided here, and positioning by tooling can also be used.

[0029] The rotor component 30 is movably connected to the valve core component 50, so that when the rotor component 30 moves axially relative to the nut 41, the rotor component 30 can drive the valve core component 50 to move axially. The rotor component 30 also includes a bearing 34 and a connecting member 35. Figure 7 As shown, the bearing 34 includes a bearing inner ring 341, a bearing outer ring 342, and a ball 343. The lower end of the screw rod 33 is fixedly connected to the bearing inner ring 341, and the two can be fixedly connected by welding or riveting. The connector 35 is disposed on the outside of the screw rod 33. The screw rod 33 includes a radial protrusion 331. The radial protrusion 331 restricts the connector 35 from being separated from the upper end of the screw rod 33. That is, the connector 35 is axially limited between the radial protrusion 331 and the bearing 34. The connector 35 is fixedly connected to the valve sleeve 52 and can be fixed by riveting. When the electric valve is in the open state, the upper end of the bearing outer ring 342 abuts the connector 35. When the electric valve is in the closed state, there is a displacement between the upper end of the bearing outer ring 342 and the connector 35.

[0030] The upper end surface of the bearing outer ring 342 of the bearing 34 can contact the lower end surface of the connector 35. With the bearing 34, when the rotor 31 is driven to rotate clockwise or counterclockwise, the screw 33 rotates and moves axially with the rotor 31. As the screw 33 rotates and moves downward, it directly acts on the bearing inner ring 341, causing the bearing outer ring 342 to move downward only under axial force, and the valve core component 50 does not rotate with the rotation of the screw 33. After the valve core component 50 contacts the sealing portion 231 of the sealing ring 23, the valve core component 50 substantially does not rotate as the screw 33 continues to move downward to compress the sealing ring 23. This reduces wear between the lower end of the valve core component 50 and the sealing portion 231, thereby improving the reliability of valve closing.

[0031] like Figure 3 and Figure 4 As shown, combined with Figure 1 The valve core component 50 includes a valve core 51 and a valve sleeve 52 fixedly connected to the valve core 51. The valve core 51 is generally cylindrical and axially through-hole. The valve core 51 and the valve sleeve 52 are fixed by laser welding or argon arc welding. The valve sleeve 52 is cylindrical and axially through-hole before being assembled with other parts.

[0032] The valve sleeve 52 includes a support portion 520, on which the connector 35 of the rotor component 30 is seated. The upper end of the valve sleeve 52 is riveted and fixed to the connector 35. When the screw rod 33 moves axially upward, the screw rod 33 moves axially upward with the valve core component 50 through the bearing 34 and the connector 35.

[0033] The valve core assembly 50 also includes a bearing seat 53 and an elastic member 54. The upper end of the bearing seat 53 abuts the outer ring 531 of the bearing 34, while the lower end of the elastic member 54 directly or indirectly abuts the valve core 51. When the rotor 31 drives the screw rod 33 to rotate and move axially, the downward force transmitted by the screw rod 33 directly acts on the bearing inner ring 341, causing the bearing outer ring 342 to move only axially downward. The bearing outer ring 342 does not undergo substantial circumferential rotation relative to the screw rod 33. The downward axial force exerted on the bearing outer ring 342 acts on the elastic member 54 and the valve core 51, closing the electric valve. When the screw rod 33 rotates and moves axially upward, it directly acts on the bearing inner ring 341, driving the bearing outer ring 342 to move axially upward. This in turn acts on the connector 35, the valve sleeve 52, and the valve core 51, causing the valve core 51 to move axially upward, opening the electric valve.

[0034] Compared with the background technology, the electric valve of this solution combines the rotor component with a roughly cylindrical axially penetrating valve core and a roughly cylindrical valve sleeve, taking into account the large diameter (diameter above 3.0 mm) requirement of the electric valve and the miniaturization of the electric valve, and the overall structure is simple.

[0035] like Figure 5 As shown, in order to make the reliability and stability of the electric valve better, in this embodiment, the elastic member 54 can specifically use a compression spring. The bearing seat 53 is roughly hollow "convex". The bearing seat 53 includes a first support section 531 and a second support section 532. The first support section 531 is roughly annular, and the second support section 532 is roughly annular. The inner diameters of the first support section 531 and the second support section 532 are roughly equal in diameter, which is convenient for processing. The outer diameter of the first support section 531 is smaller than the outer diameter of the second support section 532. The inner hole of the first support section 531 and the inner hole of the second support section 532 form an axial hole 530. If the outer diameter of the elastic member 54 is smaller than the outer diameter of the bearing 34, the bearing seat 53 can be set in an inverted "convex" shape, that is, Figure 5 The middle bearing seat 53 is turned upside down.

[0036] The lower end of the valve core 51 can abut or separate from the sealing portion 231 of the sealing ring 23 to adjust the flow rate of the electric valve. Figure 6As shown, the valve core 51 is axially through-set and includes a second axial channel 5111 axially through-set. The valve core 51 is roughly cylindrical with a thick wall in the middle and thin walls at both ends. The valve core 51 includes a first thin-walled portion 511, a base 510, and a second thin-walled portion 512. The first thin-walled portion 511 is located on the upper side of the base 510, and the second thin-walled portion 512 is located on the lower side of the base 510. The inner diameter and outer diameter of the base 510 are roughly equal in diameter, and the inner diameter of the base 510 is smaller than the inner diameters of the first thin-walled portion 511 and the second thin-walled portion 513. The upper end surface of the base 510 serves as a filter component support portion 5101. The base 510 itself forms a filter component support portion 5101 for the filter component 55 to be located. There is no need to set up other components to support the filter component, thereby minimizing the number of components and saving assembly and product costs.

[0037] like Figure 3-Figure 5 As shown, the valve sleeve 52 specifically includes a sliding fit portion 521, an annular lateral projection 522, and a downward extension 523. The downward extension 523 of the valve sleeve 52 extends into the first thin-walled portion 511 of the valve core 51. The lower end surface of the lateral projection 522 rests on the upper end surface of the first thin-walled portion 511, and the lateral projection 522 axially positions the valve core 51. The outer wall of the downward extension 523 and the inner wall of the first thin-walled portion 511 can form an interference fit to facilitate pre-positioning before welding, facilitating subsequent welding and fixation.

[0038] The valve core component 50 can move axially relative to the nut 41 under the action of the rotor component. Figure 1 、 Figure 2 and Figure 4 As shown, the nut 41 includes a guide hole section 411 that provides partial space for the axial movement of the valve core component 50. The valve sleeve 52 is at least partially located in the guide hole section 411. The guide hole section 411 includes a small hole section 4111 and a large hole section 4112 located below the small hole section 4111. The inner hole of the small hole section 4111 is generally circular, and the inner hole of the large hole section 4112 is generally circular. The inner diameter of the small hole section 4111 is smaller than the inner diameter of the large hole section 4112. Since the cylindrical valve core 51 and the cylindrical valve sleeve 52 are fixedly connected, the axial length formed is relatively long. In order to ensure the coaxiality of the valve core component relative to the valve body component in the axial direction, as shown in FIG. Figure 3 As shown, the sliding fitting portion 521 of the valve sleeve 52 includes a first sliding portion 5211 that can slide and fit with the small hole section 4111 and a second sliding portion 5212 that can slide and fit with the large hole section 4112. The outer diameter of the first sliding portion 5211 is smaller than the outer diameter of the second sliding portion 5212. The guide hole section 411 of the nut 41 provides a moving stroke space for the axial movement of the valve core component 50, and provides a guide for the axial movement of the valve core component 50, which is beneficial to improving the axial offset and tilting of the valve core component 50 relative to the electric valve, and is beneficial to the valve closing reliability of the valve core 51. Figure 1As shown, when the electric valve is closed, part of the outer wall of the second sliding portion 5211 is still in clearance with the inner wall of the large hole section 4112 , and the nut 41 still guides the valve core component 50 .

[0039] Further, if Figure 3 As shown, the inner bore of the valve sleeve 52 specifically includes a first bore section 5213 and a second bore section 5214. The inner bore of the first bore section 5213 is generally circular, while the inner bore of the second bore section 5214 is generally circular. The diameter of the first bore section 5213 is smaller than that of the second bore section 5214, and the first bore section 5213 is located above the second bore section 5214. A connecting section 5215 is located between the first and second bore sections 5213 and 5214. The first support section 531 of the bearing seat 53 extends into the first bore section 5213 and is loosely fitted with the inner wall of the first small bore section 5211. The upper end of the first support section 531 abuts the outer ring 342 of the bearing 43. The inner diameter of the first support section 531 is larger than the outer diameter of the inner ring 341 of the bearing 43, ensuring that the first support section 531 does not contact the inner ring 341 of the bearing 34, thus preventing interference. The inner wall of the first hole section 5213 provides a guide for the first supporting section 531 of the bearing seat 53 .

[0040] The second support section 532 of the bearing seat 53 is located within the second hole section 5214. An axial clearance t is always maintained between the upper end surface of the second support section 532 of the bearing seat 53 and the valve sleeve 52, which facilitates the consistency of the valve opening pulse of the electric valve. However, it should be noted that the value of t varies when the valve core component of the electric valve is in different operating positions and is not a constant value. The elastic member 54 is disposed within the second hole section 5214, with the lower end of the second support section 532 of the bearing seat 53 abutting the upper end of the elastic member 54. The configuration of the bearing seat 53 allows the elastic member 54 to abut the lower end surface of the bearing seat 53, rather than directly abutting the bearing outer ring 342. This prevents deflection of the elastic member 54, stably transmits axial force, ensures internal leakage performance during valve closing, and improves the reliability and life of the electric valve.

[0041] like Figure 6 As shown, the valve core 51 further includes a guide section 514 between the first thin-walled portion 511 and the filter component support portion 5101, having a larger inner diameter at the upper end and a smaller inner diameter at the lower end. The provision of the guide section 514 facilitates the installation of the filter component 55 of the valve core component 52. The provision of the filter component 55 can improve the resistance of impurities in the fluid to enter the mating portion between the external threaded portion of the screw rod 33 and the internal threaded portion of the nut 21 when there is fluid in the electric valve, thereby preventing the screw rod 33 and the nut 21 from becoming stuck due to impurities.

[0042] like Figure 4As shown, the filter element 55 includes a bowl-shaped filter element 551 and a retaining ring 552. The filter element 551 is fixedly connected to the retaining ring 552, which is axially constrained between the valve core 51 and the valve sleeve 52. An elastic member 54 is sleeved around the outer circumference of the filter element 551, with its lower end abutting the retaining ring 552. The retaining ring 552 is seated on the filter element support 5101 and constrained between the filter element support 5101 and the lower end of the downward extension of the valve sleeve 52, ensuring secure installation of the filter element 55. The elastic member 54 indirectly abuts the valve core 51 via the retaining ring 552, allowing the elastic force of the elastic member 54 to act on the valve core 51. If the filter element 55 is not provided, the elastic member 54 can also directly abut the valve core 51. Specifically, one end of the elastic member 54 abuts the bearing seat 53, while the other end abuts the upper end of the base 510.

[0043] When the rotor 31 rotates, driving the screw 33 to rotate and move axially downward, the inner race 341 of the bearing 34 rotates and moves axially downward with the screw 33. The outer race 342 of the bearing 34 moves downward only under the axial force. The downward axial force on the outer race 342 acts on the bearing seat 53, the elastic member 54, the filter element 55, and the valve core 51. The valve core 51 abuts the sealing ring 23, closing the valve and isolating the first connecting pipe 14 from the second connecting pipe 25. When the screw 33 rotates and moves upward, the upward force acts directly on the inner race 341, driving the outer race 342 upward axially. This in turn drives the connector 35 and the valve sleeve 52, causing the valve core 51 to move axially upward, connecting the first connecting pipe 14 with the second connecting pipe 25. The filter element 55 is directly seated on the valve core 51 and abuts the elastic member 54. This simplifies installation without adding additional components, helping to reduce product costs and facilitate assembly.

[0044] like Figure 1 The electric valve further includes a sealing component 60 disposed between the connecting sleeve 13 and the valve core 51. The arrangement of the sealing component 60 prevents the first connection port 121 and the second connection port 211 from being communicated with through the valve cavity of the electric valve when the electric valve is closed. Figure 1 As shown, the sealing component 60 is located between the inner wall of the connecting sleeve 13 and the outer wall of the valve core 51, and the connecting sleeve 13 is mounted on the outside of the sealing component 60. The sealing component 60 is fixedly connected to the connecting sleeve 13. The "fixed" here means that the sealing component 60 does not fall out of the connecting sleeve 13 in the axial direction, and does not require that all parts of the sealing component 60 are fixedly connected to the connecting sleeve 13. The valve core 51 and the sealing component 60 are in a sliding fit, and the sealing component 60 also serves as an axial guide for the valve core 51.

[0045] like Figure 1 、 Figure 5As shown, the connecting sleeve 13 includes a first axial limit portion 135 and a second axial limit portion 136. Specifically, the connecting sleeve 13 includes a first step surface and a second step surface facing downward, and the first step surface and the second step surface are arranged at an axial interval on the connecting sleeve 13. The first step surface serves as a first axial limit portion 135, and the second step surface serves as a second axial limit portion 136. The sealing component 60 includes an upper limit member 61, a sealing ring 62 made of a soft material, a sliding plate 63, and a lower limit member 64. The sealing ring 62 is provided on the outer periphery of the sliding plate 63, and the sealing ring 62 and the sliding plate 63 are located between the upper limit member 61 and the lower limit member 64. The sealing ring 62 is in contact with the inner wall of the connecting sleeve 13, and the inner wall of the sliding plate 63 is in contact with the outer wall of the valve core 51. The upper limit member 61 cooperates with the first step surface so that the connecting sleeve 13 can limit the sealing component 60. The lower end of the connecting sleeve 13 is riveted and fixed to the lower limit member 64 to axially limit the sealing component 60. In order to improve the wear of the valve core 51 caused by the upper limit member 61, the slide 63 and the lower limit member 64 during the axial movement of the valve core 51, a wear-resistant layer is provided on the inner surface of the upper limit member 61, the slide 63 and the lower limit member 64 respectively or simultaneously to improve the service life of the valve core 51. Specifically, the inner surfaces of the upper limit member 61, the slide 63 and the lower limit member 64 can be plated with Ni-P-PTFE or DW or DW+PTEF by a chemical composite method. In this embodiment, Ni-P-PTFE or DW or DW+PTEF is plated on the inner surface of the slide 63 by a chemical composite method to form a wear-resistant layer.

[0046] Furthermore, the position of the lowest end of the connecting sleeve 13 is directly related to the guiding effect on the valve core 51. The lower the lower end of the connecting sleeve 13 is, the better the guiding effect. Specifically, the longer the second insertion portion 132 of the connecting sleeve 13 is, the lower the sealing component 60 is positioned in the axial direction of the electric valve. This increases the guiding effect on the valve core 51 and improves the movement rigidity of the valve core 51, ensuring the strength of the valve core 51 and extending the service life of the electric valve. At the same time, it also improves the coaxiality between the valve core 51 and the inner sleeve 24, improving or even eliminating interference of the inner sleeve 24 with the valve core 51, and facilitating reduced internal leakage.

[0047] However, the length of the second insertion portion 132 of the connecting sleeve 13 cannot be too long. Otherwise, when the electric valve is fully opened, the flow area between the first connecting port 121 and the second connecting port 211 of the electric valve will be reduced, which will have an adverse effect on the flow of fluid between the first connecting port 121 and the second connecting port 211, thereby reducing the CV value when the electric valve is fully opened. Therefore, the length of the second insertion portion 132 of the connecting sleeve 13 extending into the lower valve body 12 should be controlled. Figure 1As shown in the figure, let the vertical distance between the lower end of the connecting sleeve 13 and the central axis of the first connection port 121 be L, then 0 < L ≤ 2.5 mm. With such a design, while ensuring that the valve core 51 is sufficiently guided, the CV value when the electric valve is fully open can be taken into account.

[0048] As Figure 1 shown in the figure, the valve core 51 and the sealing component 60 are in clearance sliding fit, but the clearance is small. When there are impurities such as small particles in the fluid, the impurities may stay in the clearance between the valve core 51 and the sealing component 60. Over time, it will cause the valve core 51 to get stuck or even jam during the axial movement. For this reason, a receiving groove is provided on the inner wall of the lower limit member 64. For the convenience of processing, in this embodiment, the receiving groove is a circular groove provided along the inner wall of the lower limit member 64.

[0049] It can be understood that the receiving groove can also be provided on the outer wall of the valve core 51. A receiving groove is provided on the outer wall of the valve core 51 that is in clearance fit with the sealing component 60 as an impurity receiving groove.

[0050] The number and specific shape of the above-mentioned impurity receiving grooves are not limited, as long as the function of the above-mentioned impurity receiving grooves can be realized. The above-mentioned impurity receiving grooves can avoid the phenomenon of the valve core getting stuck or even jammed caused by impurities such as small metal particles.

[0051] The above-mentioned electric valve can be used as a valve that only functions as a switch, or as an electronic expansion valve that functions as a flow regulator. When the valve core 51 leaves the sealing part 231 of the sealing ring 23, during the axial sliding process of the valve core 51, the flow rate of the electric valve can change.

[0052] Figure 1 For the electric valve shown in the figure, the valve cavity of the electric valve includes an upper cavity A located above the connecting frame 42, a middle cavity B located between the connecting frame 42 and the sealing component 60, and a lower cavity C located between the sealing component 60 and the valve seat component 20. As Figure 1 and Figure 3 shown in the figure, the valve sleeve 52 includes a radial through hole 5210. Specifically, the radial through hole 5210 can be provided on the wall of the second sliding part 5212 of the valve sleeve 52. When the electric valve opens, the first connection port 121 is connected to the second interface part 211. When the electric valve closes, the second interface part 211 is connected to the second axial channel 5111 of the valve core 51, the inner cavity of the valve sleeve 52, the radial through hole 5210, and the first axial channel 421 of the connecting frame 42. That is, the electric valve includes a balance channel. The balance channel includes the second axial channel 5111 of the valve core 51, the inner cavity of the valve sleeve 52, the radial through hole 5210, and the first axial channel 421 of the connecting frame 42. The balance channel connects the upper cavity A, the middle cavity B, the inner cavity of the valve core component 50, and the second interface part 211 of the valve cavity of the electric valve, which is beneficial to the opening action of the electric valve.

[0053] The following is a detailed description of the assembly method of the above-mentioned electric valve. The assembly method of the electric valve mainly includes the following steps:

[0054] The lower valve body 12 and the connecting sleeve 13 are fixedly connected: Specifically, the lower valve body 12 and the connecting sleeve 13 can be fixedly connected by argon arc welding, laser welding, or furnace welding to form a first assembly component a. The first assembly component a is then fixed to the first connecting pipe 14 by furnace welding. Alternatively, the lower valve body 12, the connecting sleeve 13, and the first connecting pipe 14 can be fixed together by furnace welding, which is more convenient and economical.

[0055] Assemble the rotor assembly b: fix the rotor 31 and the fixing frame 32 together by injection molding to form the rotor assembly b.

[0056] Assemble the nut assembly c and fix the nut 41 to the connecting frame 42. Specifically, the nut 41 and the connecting frame 42 can be fixedly connected together by injection molding.

[0057] Assemble the screw assembly d: Assemble the screw 33, bearing 34, and connector 35. Slide the connector 35 under the radial protrusion 331 of the screw 33, insert the bearing 34 between the radial protrusion 331 and the lower end of the screw 33, and securely connect the bearing inner ring 341 of the bearing 34 to the lower end of the screw 33. Specifically, the lower end of the screw 33 can be secured to the bearing inner ring 341 by riveting or welding, or by other means, as long as the bearing inner ring 341 and the screw 33 can move synchronously.

[0058] Assemble the valve sleeve 52 and the screw assembly d. Movably connect the valve sleeve 52 and the screw assembly d: Specifically, extend the bearing 34 and the connector 35 into the valve sleeve 52 so that the connector 35 is seated on the support portion 520 of the valve sleeve 52. Then, the upper end of the valve sleeve 52 and the connector 35 are riveted and fixed to form the valve sleeve screw assembly e. During this process, the valve sleeve 52 and the screw 33 are indirectly movably connected through the bearing 34 and the connector 35.

[0059] The bearing seat 53, the elastic member 54 (in this embodiment, a compression spring), and the filter component 55 are sequentially installed in the inner cavity of the valve sleeve 52 and below the bearing 34. Then, the valve core 51 and the valve sleeve 52 are fixedly connected to form a valve core screw rod assembly f.

[0060] A sealing component 60 is sleeved on the outer periphery of the valve core screw rod assembly f to form a first pre-assembled assembly 600. Figure 6 As shown, the second thin-walled portion 512 of the valve core 51 includes an expanded diameter portion 5121. The outer diameter of the expanded diameter portion 5121 is larger than the outer diameter of the base portion 510. After the sealing member 60 is inserted into the outer periphery of the valve core 51 from above the valve core screw assembly e, the expanded diameter portion 5121 prevents the sealing member 60 from falling out of the lower end of the valve core 51.

[0061] Assemble the valve seat assembly 20. Weld the valve seat body 21 to the second connecting pipe 25, specifically, by furnace welding. Then, securely connect the sealing ring 23 and inner sleeve 24 to the valve seat body 21. Place the lower end of the pressure ring 22 toward the valve seat body 21 and sealing ring 23, and rivet the upper end of the valve seat body 21 to the pressure ring 22.

[0062] The lower end of the first pre-assembled component 600 extends from the upper end of the first assembly component a into the first assembly component a. The lower end of the connecting sleeve 13 of the first assembly component a is then riveted to the lower stopper 64. This means that the lower end of the connecting sleeve 13 serves as the aforementioned second axial stopper 136. The sealing component 60 is axially restrained between the first axial stopper 135 and the second axial stopper 136. It is understood that the lower end of the connecting sleeve 13 can also be welded to the lower stopper 64, if feasible.

[0063] The lower valve body 12 and the valve seat body 21 are welded and fixed.

[0064] The connector 42 of the nut assembly C is welded to the connecting sleeve 13. Specifically, the connecting frame 42 of the nut assembly C and the connecting sleeve 13 are pre-positioned so that the outer wall of the connecting frame 42 and the connecting sleeve 13 have a clearance fit. Then, the connecting frame 42 and the connecting sleeve 13 are welded to each other. The connecting frame 42 and the connecting sleeve 13 can be welded together by laser welding or argon arc welding.

[0065] Weld the fixing frame 32 in the rotor assembly b to the screw 33 of the screw assembly d in step D.

[0066] The upper valve body 11 and the connecting sleeve 13 are welded and fixed to complete the assembly of the valve component 100. Specifically, the upper valve body 11 is seated on the first positioning portion 1301 of the connecting sleeve 13, and the upper valve body 11 and the connecting sleeve 13 are laser welded and fixed.

[0067] The above examples illustrate the electric valve and electric valve assembly method provided by this application. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. It should be noted that for ordinary technicians in this technical field, various improvements and modifications can be made to this application without departing from the principles of this application. Such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. An electric valve, characterized in that: The nut component is fixedly connected to the valve body component, and the rotor component can drive the valve core component to move axially along the valve body component. The nut component includes a nut, and the rotor component includes a rotor and a screw rod. The nut is threadedly connected to the screw rod. The valve core component includes a valve sleeve and a valve core. The valve sleeve is roughly cylindrical. The valve sleeve is movably connected to the screw rod. The screw rod can drive the valve sleeve to move axially. The valve sleeve is fixedly connected to the valve core. Then, the valve core can abut against or separate from the sealing portion of the valve seat component, the valve sleeve includes a sliding fitting portion, the sliding fitting portion includes a first sliding portion and a second sliding portion, the outer diameter of the first sliding portion is smaller than the outer diameter of the second sliding portion, the nut includes a guide hole section, the guide hole section includes a small hole section and a large hole section, the inner hole of the small hole section is roughly a circular hole, the inner hole of the large hole section is roughly a circular hole, the inner diameter of the small hole section is smaller than the inner diameter of the large hole section, the outer wall of the first sliding portion can be slidably fitted with the inner wall clearance of the small hole section, and the outer wall of the second sliding portion can be slidably fitted with the inner wall clearance of the large hole section.

2. The electric valve according to claim 1, characterized in that The rotor component includes a bearing, and the bearing includes a bearing outer ring and a bearing inner ring. The bearing inner ring is fixedly connected to the screw rod. The valve core component also includes a bearing seat and an elastic member. The bearing seat abuts the bearing outer ring, one end of the elastic member abuts the bearing seat, and the other end of the elastic member abuts the valve core.

3. The electric valve according to claim 2, characterized in that The bearing seat includes a first support section and a second support section, and the valve sleeve includes a first hole section and a second hole section. The first support section and the first hole section can be slidably fitted, and the second support section and the second hole section can be slidably fitted, and there is always an axial gap between the upper end of the second support section and the valve sleeve.

4. The electric valve according to claim 3, characterized in that The first support segment is roughly annular in shape, the second support segment is roughly annular in shape, the outer diameter of the first support segment is smaller than the outer diameter of the second support segment, the inner hole of the first hole segment is roughly a circular hole, the inner hole of the second hole segment is roughly a circular hole, the inner diameter of the first hole segment is smaller than the inner diameter of the second hole segment, the first support segment and the first hole segment can be loosely slidably fitted, and the second support segment and the second hole segment can be loosely slidably fitted.

5. The electric valve according to any one of claims 1 to 4, characterized in that: The valve body component includes an upper valve body, a lower valve body and a connecting sleeve. The connecting sleeve is welded and fixed to the lower valve body. A sealing component is provided between the connecting sleeve and the valve core. The inner wall of the sealing component is in contact with the outer wall of the valve core. The valve core can slide axially relative to the sealing component.

6. The electric valve according to claim 5, characterized in that: The sealing component includes a sealing member, an upper limit member, a lower limit member and a sliding member, the sealing member and the sliding member are arranged between the upper limit member and the lower limit member, the sealing member is sleeved on the outer periphery of the sliding member, the outer wall of the sealing member is sealed in contact with the inner wall of the connecting sleeve, the inner wall of the sliding member is sealed in contact with the outer wall of the valve core, the inner surface of at least one of the upper limit member, the sliding member and the lower limit member is plated with Ni-P-PTFE or DW or DW+PTEF by a chemical composite method, the valve body component includes a first connecting port, the vertical distance between the lower end of the connecting sleeve and the central axis of the first connecting port is L, then 0 <L≤2.5mm。 7. The electric valve according to any one of claims 2 to 4, characterized in that: The valve seat component also includes a sealing ring of non-metallic material fixedly connected to the valve seat body, the sealing ring includes the sealing portion, the rotor component also includes a connecting piece, the connecting piece is fixedly connected to the valve sleeve, the connecting piece is sleeved on the outer periphery of the screw rod, the screw rod includes a radial protrusion, the connecting piece is axially limited between the radial protrusion and the bearing, when the electric valve is in the valve-opening state, the upper end of the bearing outer ring abuts against the connecting piece, when the electric valve is in the valve-closing state, there is a displacement between the upper end of the bearing outer ring and the connecting piece.

8. The electric valve according to any one of claims 2 to 4, characterized in that: The valve sleeve also includes a downward extension and a circular side convex portion, the outer diameter of the side convex portion is larger than the outer diameter of the sliding fitting portion, the outer diameter of the side convex portion is larger than the outer diameter of the downward extension portion, the downward extension portion extends into the inner cavity of the valve core, the upper end of the valve core abuts against the side convex portion, and the valve core is welded and fixed to the valve sleeve.

9. The electric valve according to claim 8, characterized in that The valve body component includes a first connecting port portion, the valve seat component includes a second interface portion, the valve core component also includes a filter component, the filter component includes a filter element and a fixing ring, the lower end of the elastic component is sleeved on the outside of the filter element, the valve core is roughly axially through the cylindrical shape, the valve core includes a base, a first thin-walled portion and a second thin-walled portion, the first thin-walled portion is arranged on one side of the base, and the second thin-walled portion is arranged on the other side of the base, the base includes a filter component support portion, the fixing ring is seated on the filter component support portion, the axial limit of the fixing ring is located between the lower end of the downward extension portion and the filter component support portion, one end of the elastic component abuts the bearing seat, and the other end of the elastic component abuts the fixing ring.

10. The electric valve according to claim 9, characterized in that The nut component includes a first axial channel, and the valve core includes a second axial channel and a radial through hole. When the electric valve is in an open state, the first connecting port is connected to the second interface portion. When the electric valve is in a closed state, the first axial channel, the second axial channel, the radial through hole, and the second interface portion are connected.

11. A method for assembling an electric valve, characterized in that: The electric valve includes a valve body component, a valve seat component, a nut component, a rotor component and a valve core component, the nut component includes a nut, the rotor component includes a rotor, a screw rod and a bearing, the valve core component includes a valve sleeve, a valve core, a bearing seat and an elastic member, the valve sleeve is roughly cylindrical, the valve sleeve includes a sliding fitting portion, the sliding fitting portion includes a first sliding portion and a second sliding portion, the outer diameter of the first sliding portion is smaller than the outer diameter of the second sliding portion, the nut includes a guide hole section, the guide hole section includes a small hole section and a large hole section, the inner hole of the small hole section is roughly circular, the inner hole of the large hole section is roughly circular, the inner diameter of the small hole section is smaller than the inner diameter of the large hole section, and the assembly method includes the following steps: Assembling the screw assembly: fixedly connecting the bearing to the screw; Assembling the valve sleeve screw assembly: movably connecting the valve sleeve and the screw assembly; Assemble the valve core screw rod assembly: after the bearing seat and the elastic member are installed in the inner cavity of the valve sleeve, the valve core is fixedly connected to the valve sleeve so that one end of the elastic member abuts against the bearing seat and the other end of the elastic member abuts against the valve core.

12. The method for assembling an electric valve according to claim 11, characterized in that: The electric valve further comprises a sealing valve body component including a lower valve body and a connecting sleeve, and the valve seat component includes a valve seat body. The assembly method comprises the following steps: Assembling the first assembly component: fixedly connecting the lower valve body and the connecting sleeve; Assembling the first pre-assembled component: sleeve a sealing component on the outer periphery of the valve core screw rod component to form the first pre-assembled component; Fixedly connecting the lower valve body to the valve seat body; Assembling the first preassembled component with the first assembly component; Assemble the nut assembly, then fix the nut assembly to the connecting sleeve, and enable the first sliding part to slide with the small hole section, and the second sliding part to slide with the large hole section.

13. The method for assembling an electric valve according to claim 12, wherein: The valve core is roughly cylindrical and axially through, and the valve core component also includes a filter component. The valve core includes a filter component support portion. When assembling the valve core screw assembly, the following steps are also included: the lower end of the elastic member is sleeved on the outside of the filter component, so that one end of the elastic member abuts against the bearing seat, and the other end of the elastic member abuts against the filter component.

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