An electrically operated valve

Abstract

The application discloses an electric valve, which comprises 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 with the valve body component, the rotor component can drive the valve core component to move along the axial direction of the valve body component, the nut component comprises a nut, the rotor component comprises a rotor and a screw rod, the nut is threadedly connected with the screw rod, the valve core component comprises a valve sleeve and a valve core, the valve sleeve is approximately in a cylindrical shape, the valve core is approximately in a cylindrical shape and penetrates through the valve sleeve in the axial direction, the valve sleeve is movably connected with the screw rod, the screw rod can drive the valve sleeve to move in the axial direction, the valve sleeve is fixedly connected with the valve core, the valve core can abut against or separate from a sealing part of the valve seat component, the nut comprises a guide hole section, the valve sleeve is at least partially located in the guide hole section, and the valve sleeve is in a clearance sliding fit with the guide hole section.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and in particular to an electric valve. Background Technology

[0002] In the field of fluid control technology, such as refrigeration technology, electric valves can be used to cut off or regulate refrigerant or regulate compressor suction pressure. Figure 8 The diagram shown is a structural schematic of an electric valve in the background art. Figure 9 As shown Figure 8 Exploded view of the valve core component. 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 033, and a preload spring 034. The valve core assembly 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 11 and 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 fitted onto 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 presses against the sealing gasket 0333. The valve core component of this electric valve has a relatively complex structure. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve with a simple valve core component structure.

[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 lead screw. The nut is threadedly connected to the lead screw. The valve core component includes a valve sleeve and a valve core. The valve sleeve is generally cylindrical. The valve core is generally axially through a cylindrical shape. The valve sleeve is movably connected to the lead screw. The lead screw can drive the valve sleeve to move axially. The valve sleeve is fixedly connected to the valve core. The valve core can abut against or separate from the sealing part of the valve seat component. The nut includes a guide hole section. The valve sleeve is at least partially located in the guide hole section. The valve sleeve and the guide hole section are in a clearance sliding fit.

[0005] The electric valve of this solution has a valve core component including a valve sleeve and a valve core. The valve sleeve is roughly cylindrical, and the valve core is roughly axially cylindrical. The valve sleeve and the valve core are fixedly connected. Compared with the prior art, the valve core component of this electric valve has a simple structure. Attached Figure Description

[0006] Figure 1 The diagram shown is a structural schematic of an embodiment of the electric valve of the present invention.

[0007] Figure 2 As shown Figure 1 Schematic diagram of the connection structure of some components in the middle section;

[0008] Figure 3 As shown Figure 1 Cross-sectional view of the valve sleeve;

[0009] Figure 4 As shown Figure 1 Schematic diagram of the middle valve core component;

[0010] Figure 5 The diagram shows the connection structure between the valve core component and the lead screw, etc.

[0011] Figure 6 As shown Figure 1 Cross-sectional view of the valve core;

[0012] Figure 7 As shown Figure 1 Schematic diagram of the structure of the intermediate bearing;

[0013] Figure 8 The diagram shown is a structural schematic of an electric valve in the background art.

[0014] Figure 9 As shown Figure 8 Exploded view of the valve core component. Detailed Implementation

[0015] It should be noted that when directional terms such as "upper" and "lower" are used in this document, they are defined based on the positions shown in the accompanying drawings. It should be understood that the use of these directional terms is only for the clarity and convenience of describing the technical solution and should not limit the scope of protection.

[0016] In this article, "active connection" refers to a connection where one entity can directly or indirectly drive the movement of another, and where, under certain conditions, the two entities can move relative to each other.

[0017] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 The diagram shown is a structural schematic of an embodiment of the electric valve of the present invention. Figure 2 As shown Figure 1 A schematic diagram of the connection structure of some components in the middle section. Figure 3 As shown Figure 1A sectional view of the valve sleeve. Figure 4 As shown Figure 1 Schematic diagram of the middle valve core component. Figure 5 The diagram shows the connection structure between the valve core component and the lead screw, etc. Figure 6 As shown Figure 1 Cross-sectional view of the valve core.

[0019] like Figure 1 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 interface portion 121, and a first connecting pipe 14 is fixedly connected to the first interface portion 121. The upper valve body 11, lower valve body 12, and connecting sleeve 13 are all made of stainless steel. The connecting sleeve 13 is generally cylindrical and includes a second insertion portion 132 located inside the lower valve body 12, a first insertion 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 insertion portion 131 and the connecting portion 133 together form a first positioning portion, and the second insertion portion 132 and the connecting portion 133 together form a second positioning portion.

[0020] As one specific embodiment, such as Figure 1 and Figure 2 As shown, the outer diameter of the connecting portion 133 is larger than the outer diameter of the second insertion portion 132, and the outer diameter of the connecting portion 133 is larger than the outer diameter of the first insertion portion 131. Thus, the connecting portion 133 and the first insertion portion 131 together form a stepped first positioning portion 1301, and the connecting portion 133 and the second insertion portion 132 together form a stepped second positioning portion 1302. The lower end of the upper valve body 11 contacts the connecting portion 133, the outer wall of the first insertion portion 131 is press-fitted 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 insertion portion 132 is press-fitted with the inner wall of the lower valve body 12. At this time, 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 the first welding position by laser welding or argon arc welding. The lower valve body 12 and the connecting part 133 form a second welding position at the mating point. The lower valve body 12 and the connecting part 133 are fixed at the second welding position by laser welding, argon arc welding or furnace welding.

[0021] The upper valve body 11 is a stainless steel drawn part, and the lower valve body 12 is a stainless steel drawn 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 facilitates 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 fitting accuracy between the valve core 51 and the sealing part of the valve seat component 20.

[0022] like Figure 1 As shown, the valve seat component 20 includes a valve seat body 21, a pressure ring 22, a sealing ring 23, and an inner bushing 24. The valve seat body 21 is welded and fixed to the lower valve body 12, and the pressure ring 22 is riveted and fixed to the valve seat body 21. The sealing ring 23 is installed between the stepped hole of the valve seat body 21 and the inner bushing 24. The sealing ring 23 is made of a non-metallic soft material, such as rubber or PTFE. The sealing ring 23 includes a sealing part 231. The lower valve body 12 is welded and fixed to the valve seat body 21, and the second connecting pipe 25 is welded and fixed to the second connecting port 211 of the valve seat body 21.

[0023] The rotor assembly 30, nut assembly 40, and valve core assembly 30 are all located within the valve cavity. For example... Figure 1 As shown, the rotor assembly 30 is axially movable relative to the valve body assembly 10. The rotor assembly 30 includes a rotor 31, a fixed frame 32, and a lead screw 33. The fixed frame 32 is fixedly connected to the rotor 31 and the lead screw 33. The rotor 31 is clearance-fitted to the upper valve body 11, and the lead screw 33 is drively connected to the nut 41 of the nut assembly 40. Specifically, the external thread of the lead screw 33 is threadedly engaged with the internal thread of the nut 41. The rotor assembly 30 is capable of circumferential rotation and axial movement relative to the nut 41 (described below).

[0024] like Figure 1 and Figure 2 As shown, the nut assembly 40 also includes a connecting bracket 42. The nut 41 is made of plastic, and the connecting bracket 42 is made of metal, which may be stainless steel. The connecting bracket 42 is injection molded to the nut 41. The connecting bracket 42 includes a first axial channel 421.

[0025] like Figure 2 As shown, the inner wall of the connecting sleeve 13 includes a third positioning part 1303. The connecting frame 42 of the nut assembly 40 is pre-positioned with the third positioning part 1303. In this embodiment, the third positioning part 1303 is stepped, and 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 the connecting frame 42 and the connecting sleeve 13 are riveted. It should be noted that, here, the third positioning part 1303 is not provided, and positioning by tooling is also possible.

[0026] The rotor assembly 30 is movably connected to the valve core assembly 50, so that during the axial movement of the rotor assembly 30 relative to the nut 41, the rotor assembly 30 can drive the valve core assembly 50 to move axially. The rotor assembly 30 also includes a bearing 34 and a connecting member 35. Figure 7As shown, bearing 34 includes an inner bearing ring 341, an outer bearing ring 342, and balls 343. The lower end of the lead screw 33 is fixedly connected to the inner bearing ring 341, and the two can be fixedly connected by welding or riveting. A connecting member 35 is disposed outside the lead screw 33. The lead screw 33 includes a radial protrusion 331, which restricts the connecting member 35 from detaching from the upper end of the lead screw 33. That is, the connecting member 35 is axially limited between the radial protrusion 331 and the bearing 34. The connecting member 35 is fixedly connected to the valve sleeve 52 and can be riveted. When the electric valve is in the open state, the upper end of the outer bearing ring 342 abuts against the connecting member 35. When the electric valve is in the closed state, there is a displacement between the upper end of the outer bearing ring 342 and the connecting member 35.

[0027] The upper end face of the outer ring 342 of bearing 34 can contact the lower end face of connector 35. By installing bearing 34, when rotor 31 is driven to rotate clockwise or counterclockwise, lead screw 33 rotates with rotor 31 and moves axially. When lead screw 33 rotates and moves downward, it directly acts on the inner ring 341 of bearing, causing the outer ring 342 to move downward under axial force only. Valve core component 50 does not rotate with the rotation of lead screw 33. When valve core component 50 contacts the sealing part 231 of sealing ring 23, during the process of lead screw 33 continuing to move downward to press the sealing ring 23, valve core component 50 basically does not rotate. This improves the wear between the lower end of valve core component 50 and sealing part 231, which is beneficial to improving the reliability of valve closure.

[0028] like Figure 3 and Figure 4 As shown, and in combination 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 with an axial through-hole shape, and the valve core 51 is fixed to the valve core sleeve 52 by laser welding or argon arc welding. The valve sleeve 52 is cylindrical and is also axially through-hole before being assembled with other parts.

[0029] The valve sleeve 52 includes a support portion 520, and the connecting piece 35 of the rotor component 30 is located on the support portion 520. The upper end of the valve sleeve 52 is riveted and fixed to the connecting piece 35. When the lead screw 33 moves axially upward, the lead screw 33 carries the valve core component 50 axially upward through the bearing 34 and the connecting piece 35.

[0030] The valve core component 50 also includes a bearing housing 53 and an elastic element 54. The upper end of the bearing housing 53 abuts against the outer ring 531 of the bearing 34, and the lower end of the elastic element 54 abuts directly or indirectly against the valve core 51. When the rotor 31 drives the lead screw 33 to rotate and move axially, and the lead screw 33 rotates downward, the downward force transmitted by the lead screw 33 acts directly on the inner ring 341 of the bearing, while the outer ring 342 only moves downward axially. The outer ring 342 does not rotate circumferentially relative to the lead screw 33. The downward axial force on the outer ring 342 acts on the elastic element 54 and the valve core 51, thereby closing the electric valve. When the lead screw 33 rotates and moves upward axially, it acts directly on the inner ring 341 of the bearing, driving the outer ring 342 to move upward axially, which in turn acts on the connecting part 35, the valve sleeve 52, and the valve core 51, causing the valve core 51 to move upward axially and opening the electric valve.

[0031] Compared with the prior art, the electric valve of this solution has a simple valve core component structure. It combines the rotor component with the axially penetrating valve core and the valve sleeve, which are roughly cylindrical in shape, to meet the requirements of large-diameter electric valves (diameter above 3.0mm) and miniaturization of electric valves. The overall structure of the electric valve is simple.

[0032] like Figure 5 As shown, to improve the reliability and stability of the electric valve, in this embodiment, the elastic element 54 can specifically be a compression spring. The bearing seat 53 is generally a hollow "convex" shape. The bearing seat 53 includes a first support section 531 and a second support section 532. The first support section 531 is generally annular, and the second support section 532 is generally annular. The inner diameters of the first support section 531 and the second support section 532 are approximately equal for ease of machining. The outer diameter of the first support section 531 is smaller than the outer diameter of the second support section 532. The inner holes of the first support section 531 and the second support section 532 form an axial hole 530. When the outer diameter of the elastic element 54 is smaller than the outer diameter of the bearing 34, the bearing seat 53 can be arranged in an inverted "convex" shape, that is... Figure 5 The bearing housing 53 is rotated up and down.

[0033] The lower end of the valve core 51 can abut or separate from the sealing portion 231 of the sealing ring 23 to regulate the flow rate of the electric valve. For example... Figure 6As shown, the valve core 51 is axially through, including a second axially through channel 5111. The valve core 51 is generally cylindrical with a thick middle wall and thin ends, and includes a first thin-walled portion 511, a base 510, and a second thin-walled portion 512. The first thin-walled portion 511 and the second thin-walled portion 512 are located above and below the base 510, respectively. The inner and outer diameters of the base 510 are approximately equal, 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 face of the base 510 serves as a filter component support 5101. The base 510 itself forms a filter component support 5101 for the filter component 55 to sit on, eliminating the need for other components to support the filter component, minimizing the number of components, and saving assembly and product costs.

[0034] like Figures 3-5 As shown, the valve sleeve 52 specifically includes a sliding fit portion 521, an annular side protrusion portion 522, and a lower extension portion 523. The lower extension portion 523 of the valve sleeve 52 extends into the first thin-walled portion 511 of the valve core 51, and the lower end face of the side protrusion portion 522 sits on the upper end face of the first thin-walled portion 511, thus axially positioning the valve core 51. The outer wall of the lower extension portion 523 and the outer wall of the first thin-walled portion 511 can be interference-fitted for pre-positioning before welding, facilitating subsequent welding and fixing.

[0035] The valve core component 50 described above can move axially relative to the nut 41 under the action of the rotor component. For example... 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 approximately circular, and the inner hole of the large hole section 4112 is also approximately circular. The inner diameter of the small hole section 4111 is smaller than the inner diameter of the large hole section 4112. Because the axial length formed after the cylindrical valve core 51 and the cylindrical valve sleeve 52 are fixedly connected is relatively long, in order to ensure the coaxiality of the valve core component relative to the valve body component in the axial direction, such as... Figure 3 As shown, the sliding fit portion 521 of the valve sleeve 52 includes a first sliding portion 5211 that can slide with a small orifice section 4111 with a clearance, and a second sliding portion 5212 that can slide with a large orifice section 4112 with a clearance. 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 travel space for the axial movement of the valve core component 50, and provides guidance for the axial movement of the valve core component 50, which helps to improve the axial offset and tilting of the valve core component 50 relative to the electric valve, and improves 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 part 5211 still has a clearance fit with the inner wall of the large hole section 4112, and the nut 41 still guides the valve core component 50.

[0036] Furthermore, such as 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 approximately circular, and the inner bore of the second bore section 5214 is also approximately circular. The diameter of the first bore section 5213 is smaller than the diameter 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 included between the first bore section 5213 and the second bore section 5214. The first support section 531 of the bearing housing 53 extends into the first bore section 5213 and has a clearance fit with the inner wall of the first small bore section 5211. The upper end of the first support section 531 abuts against 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, so that the first support section 531 does not contact the inner ring 341 of the bearing 34, thus avoiding interference. The inner wall of the first hole section 5213 provides guidance for the first support section 531 of the bearing seat 53.

[0037] The second support section 532 of the bearing housing 53 is located within the second bore section 5214. There is always an axial clearance t between the upper end face of the second support section 532 of the bearing housing 53 and the valve sleeve 52, which is beneficial for the consistency of the 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 working positions; it is not a constant value. The elastic element 54 is located within the second bore section 5214, and the lower end of the second support section 532 of the bearing housing 53 abuts against the upper end of the elastic element 54. The arrangement of the bearing housing 53, so that the elastic element 54 abuts against the lower end face of the bearing housing 53, rather than directly against the outer ring 342 of the bearing, helps prevent the elastic element 54 from skewing, ensures stable axial force transmission, guarantees internal leakage performance when the valve is closed, improves the reliability of the electric valve, and extends its service life.

[0038] like Figure 6 As shown, the valve core 51 also includes a guide section 514 between the first thin-walled portion 511 and the filter component support portion 5101. This guide section 514 has a larger upper inner diameter and a smaller lower inner diameter than the upper inner diameter. The guide section 514 facilitates the installation of the filter component 55 on the valve core component 52. The filter component 55 improves the fit between the external thread of the lead screw 33 and the internal thread of the nut 21 when there is fluid in the electric valve, preventing the lead screw 33 and nut 21 from jamming due to impurities.

[0039] like Figure 4As shown, the filter element 55 includes a bowl-shaped filter element 551 and a retaining ring 552. The filter element 551 and the retaining ring 552 are fixedly connected, and the retaining ring 552 is axially confined between the valve core 51 and the valve sleeve 52. An elastic element 54 is sleeved on the outer periphery of the filter element 551, and the lower end of the elastic element 54 abuts against the retaining ring 552. The retaining ring 552 is located on the filter element support portion 5101 and is confined between the filter element support portion 5101 and the lower end of the lower extension of the valve sleeve 52, ensuring reliable installation of the filter element 55. The elastic element 54 indirectly abuts against the valve core 51 through the retaining ring 552, allowing the elastic force of the elastic element 54 to act on the valve core 51. When the filter element 55 is not provided, the elastic element 54 can also directly abut against the valve core 51. That is, one end of the elastic element 54 abuts against the bearing seat 53, and the other end of the elastic element 54 abuts against the upper end of the base 510.

[0040] When the rotor 31 rotates, driving the lead screw 33 to rotate and move axially downward, the inner ring 341 of the bearing 34 rotates with the lead screw 33 and moves axially downward. The outer ring 342 of the bearing 34 is only subjected to axial force and moves downward. The downward axial force on the outer ring 342 acts on the bearing housing 53, the elastic element 54, the filter element 55, and the valve core 51. The valve core 51 abuts against the sealing ring 23 to close the valve, thus preventing the first connecting pipe 14 from communicating with the second connecting pipe 25. When the lead screw 33 rotates and moves upward, the upward force acts directly on the inner ring 341 of the bearing, driving the outer ring 342 to move axially upward, which in turn drives the connecting part 35 and the valve sleeve 52, causing the valve core 51 to move axially upward, thus connecting the first connecting pipe 14 with the second connecting pipe 25. The filter element 55 sits directly on the valve core 51 and abuts against the elastic element 54. Its installation method is simple, does not add other parts, helps to reduce product costs, and the assembly process is also convenient.

[0041] like Figure 1 The electric valve also includes a sealing component 60 disposed between the connecting sleeve 13 and the valve core 51. The sealing component 60 is disposed such that when the electric valve is closed, there is no communication between the first connecting port 121 and the second connecting port 211 through the valve cavity of the electric valve. 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, with the connecting sleeve 13 sleeved over the sealing component 60. The sealing component 60 is fixedly connected to the connecting sleeve 13. Here, "fixed" means that the sealing component 60 does not axially dislodge from the connecting sleeve 13, but does not mean 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.

[0042] like Figure 1 , Figure 5As shown, the connecting sleeve 13 includes a first axial limiting portion 135 and a second axial limiting portion 136. Specifically, the connecting sleeve 13 includes a downward-facing first stepped surface and a second stepped surface, which are axially spaced apart. The first stepped surface serves as the first axial limiting portion 135, and the second stepped surface serves as the second axial limiting portion 136. The sealing component 60 includes an upper limiting member 61, a sealing ring 62 made of soft material, a sliding plate 63, and a lower limiting member 64. The sealing ring 62 is disposed on the outer periphery of the sliding plate 63, and the sealing ring 62 and the sliding plate 63 are located between the upper limiting member 61 and the lower limiting member 64. The sealing ring 62 abuts against the inner wall of the connecting sleeve 13, and the inner wall of the sliding plate 63 abuts against the outer wall of the valve core 51. The upper limit stop 61 mates with the first stepped surface to limit the sealing component 60 with the connecting sleeve 13. The lower end of the connecting sleeve 13 is riveted to the lower limit stop 64 to axially limit the sealing component 60. To mitigate wear on the valve core 51 caused by the upper limit stop 61, sliding plate 63, and lower limit stop 64 during axial movement, wear-resistant layers are provided on the inner surfaces of the upper limit stop 61, sliding plate 63, and lower limit stop 64, respectively or simultaneously, to improve the service life of the valve core 51. Specifically, Ni-P-PTFE, DW, or DW+PTEF can be chemically plated on the inner surfaces of the upper limit stop 61, sliding plate 63, and lower limit stop 64. In this embodiment, a wear-resistant layer is formed on the inner surface of the sliding plate 63 by chemically plating Ni-P-PTFE, DW, or DW+PTEF.

[0043] 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, the better the guiding effect. That is, the second insertion part 132 of the connecting sleeve 13 is longer, so that the sealing component 60 is positioned as low as possible in the axial direction of the electric valve, which increases the guiding effect on the valve core 51 and makes the movement rigidity of the valve core 51 better, ensuring the strength of the valve core 51 and improving the service life of the electric valve. At the same time, it also makes the coaxiality between the valve core 51 and the inner bushing 24 better, improving or even avoiding the interference of the inner bushing 24 on the valve core 51, which is conducive to improving internal leakage.

[0044] 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 open, the flow area between the first connection port 121 and the second connection port 211 of the electric valve will decrease, adversely affecting the fluid flow between the first connection port 121 and the second connection port 211, and reducing the CV value when the electric valve is fully open. 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, 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 sufficient guidance for the valve core 51, the CV value when the electric valve is fully open can be taken into account.

[0045] As Figure 1 shown, 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 may cause the valve core 51 to get stuck or even jam during 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.

[0046] 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.

[0047] The number and specific shape of the above-mentioned impurity receiving grooves are not limited, as long as the functions of the above-mentioned impurity receiving grooves can be realized. The above-mentioned impurity receiving grooves can avoid the valve core from getting stuck or even jammed caused by impurities such as small metal particles.

[0048] The number and specific shape of the above-mentioned impurity receiving grooves are not limited, as long as the functions of the above-mentioned impurity receiving grooves can be realized. The above-mentioned impurity receiving grooves can avoid the valve core from getting stuck or even jammed caused by impurities such as small metal particles.

[0049] 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 portion 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.

[0050] Figure 1 For the electric valve shown, 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 3As shown, the valve sleeve 52 includes a radial through hole 5210, specifically, the radial through hole 5210 can be disposed on the wall of the second sliding part 5212 of the valve sleeve 52. When the electric valve is opened, the first connecting port 121 communicates with the second interface 211. When the electric valve is closed, the second interface 211 communicates with 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, which 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 211 of the electric valve, which is beneficial to the opening action of the electric valve.

[0051] The assembly method of the above-mentioned electric valve is described in detail below. The assembly method of the electric valve mainly includes the following steps:

[0052] The lower valve body 12 is fixedly connected to the connecting sleeve 13: 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 the first assembly component a. Then, the first assembly component a is welded and 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 welded and fixed together by furnace welding, which is more convenient and economical.

[0053] Assemble rotor assembly b: The rotor 31 and the fixing frame 32 are fixedly connected by injection molding to form rotor assembly b.

[0054] Assemble the nut assembly c, and fix the nut 41 to the connecting bracket 42. Specifically, the nut 41 and the connecting bracket 42 can be fixedly connected together by injection molding.

[0055] Assemble the lead screw assembly d: Assemble the lead screw 33, bearing 34, and connector 35. Place the connector 35 below the radial protrusion 331 of the lead screw 33. Place the bearing 34 between the radial protrusion 331 and the lower end of the lead screw 33. Fix the inner ring 341 of the bearing 34 to the lower end of the lead screw 33. Specifically, the lower end of the lead screw 33 can be riveted or welded to the inner ring 341, or it can be fixed in other ways, as long as the inner ring 341 of the bearing moves synchronously with the lead screw 33.

[0056] Assemble the valve sleeve 52 and the lead screw assembly d. Connect the valve sleeve 52 and the lead screw assembly d movably: Specifically, extend the bearing 34 and the connector 35 into the valve sleeve 52, so that the connector 35 sits on the support portion 520 of the valve sleeve 52. Then, rivet the upper end of the valve sleeve 52 and the connector 35 to form the valve sleeve lead screw assembly e. During this process, the valve sleeve 52 and the lead screw 33 are indirectly and movably connected through the bearing 34 and the connector 35.

[0057] In the inner cavity of the valve sleeve 52 and below the bearing 34, the bearing seat 53, the elastic element 54 (in this embodiment, specifically a compression spring), and the filter component 55 are sequentially installed. Then, the valve core 51 and the valve sleeve 52 are fixedly connected to form the valve core screw assembly f.

[0058] A sealing component 60 is fitted around the outer periphery of the valve core screw assembly f to form a first pre-assembled assembly 600. For example... 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 fitted onto the outer periphery of the valve core 51 from above the valve core screw assembly e, the sealing member 60 will not come off from the lower end of the valve core 51 due to the arrangement of the expanded diameter portion 5121.

[0059] Assemble the valve seat component 20. Weld the valve seat body 21 to the second connecting pipe 25 for fixation; specifically, the two can be fixed by furnace welding. Then, fix the sealing ring 23 and the inner bushing 24 to the valve seat body 21. Next, place the lower end face of the pressure ring 22 towards the valve seat body 21 and the sealing ring 23, and rivet the upper end of the valve seat body 21 to the pressure ring 22.

[0060] The lower end of the first pre-assembled component 600 extends into the first assembly component a from the upper end of the first assembly component a, and the lower end of the connecting sleeve 13 of the first assembly component a is riveted to the lower limiting member 64. That is, the lower end of the connecting sleeve 13 serves as the aforementioned second axial limiting part 136. The sealing member 60 is axially limited between the first axial limiting part 135 and the second axial limiting part 136. It is understood that, where feasible, the lower end of the connecting sleeve 13 can also be welded to the lower limiting member 64.

[0061] The lower valve body 12 is welded and fixed to the valve seat body 21.

[0062] The connecting piece 42 of the nut assembly c is welded and fixed to the connecting sleeve 13. Specifically, the connecting frame 42 and the connecting sleeve 13 of the nut assembly c are pre-positioned so that the outer wall of the connecting frame 42 is clearance-fitted with the connecting sleeve 13, and then the connecting frame 42 and the connecting sleeve 13 are welded and fixed. The connecting frame 42 and the connecting sleeve 13 can be fixed by laser welding or argon arc welding.

[0063] The fixing bracket 32 ​​in rotor assembly b is welded and fixed to the lead screw 33 in lead screw assembly d in step D.

[0064] The assembly of valve component 100 is completed by welding and fixing the upper valve body 11 to the connecting sleeve 13. Specifically, the upper valve body 11 is placed on the first positioning part 1301 of the connecting sleeve 13, and the upper valve body 11 and the connecting sleeve 13 are laser welded and fixed.

[0065] The electric valve provided in this application has been illustrated above with examples. Specific examples have been used to explain the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An electric valve, characterized in that, The valve assembly 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 lead screw. The nut and the lead screw are threadedly connected. The valve core component includes a valve sleeve and a valve core. The valve sleeve is cylindrical. The valve core is generally axially through a cylindrical shape. The valve sleeve is movably connected to the lead screw. The lead screw can drive the valve sleeve to move axially. The valve sleeve and the valve core are fixedly connected. The valve core can abut against or separate from the sealing part of the valve seat component. The nut includes a guide hole section. The valve sleeve is at least partially located in the guide hole section. The valve sleeve and the guide hole section are in a clearance sliding fit. The valve sleeve includes a sliding fit portion, which 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 guide hole section of the nut includes a small hole section and a large hole section. The inner hole of the small hole section is approximately circular, and the inner hole of the large hole section is approximately circular. The first sliding portion can slide with the small hole section with a clearance, and the second sliding portion can slide with the large hole section with a clearance.

2. The electric valve according to claim 1, characterized in that, The valve sleeve further includes a side protrusion and a lower extension. The outer diameter of the side protrusion is larger than the outer diameter of the sliding mating part, and the outer diameter of the side protrusion is larger than the outer diameter of the lower extension. The lower extension extends into the inner cavity of the valve core, and the upper end of the valve core abuts against the side protrusion. The valve core is welded and fixed to the valve sleeve.

3. The electric valve according to claim 1, characterized in that, The electric valve includes a first interface portion and a second interface portion. The nut component includes a first axial channel. The valve core includes a second axial channel and a radial through hole. When the electric valve is in the open state, the first interface portion and the second interface portion are connected. When the electric valve is in the closed state, the first axial channel, the second axial channel, the radial through hole, and the second interface portion of the valve seat component are connected.

4. The electric valve according to claim 1, characterized in that, The valve body component further includes an upper valve body, a lower valve body, and a connecting sleeve. The upper valve body includes a first interface portion, and the lower valve body includes a second interface portion. The upper valve body is a stainless steel drawn member, and the lower valve body is a stainless steel drawn member. The upper valve body is welded and fixed to the connecting sleeve, and the lower valve body is welded and fixed to the connecting sleeve. The lower end of the connecting sleeve extends into the lower valve body. A sealing component is provided between the connecting sleeve and the valve core. The sealing component includes a sealing element, the inner wall of which fits against the outer wall of the valve core, and the valve core can slide axially relative to the sealing component.

5. The electric valve according to claim 2, characterized in that, The valve seat component includes a valve seat and a sealing ring made of non-metallic material fixedly connected to the valve seat. The sealing ring includes a sealing portion. The rotor component includes a bearing, which includes an outer bearing ring and an inner bearing ring. The inner bearing ring is fixedly connected to the lead screw. The valve core component also includes a bearing housing and an elastic element. The bearing housing abuts against the outer bearing ring, and one end of the elastic element abuts against the bearing housing and the other end abuts against the valve core.

6. The electric valve according to claim 5, characterized in that, The bearing housing includes a first support section and a second support section. The outer diameter of the first support section is smaller than the outer diameter of the second support section. The valve sleeve includes a first hole section and a second hole section. The inner diameter of the first hole section is smaller than the inner diameter of the second hole section. The first support section and the first hole section are in a clearance sliding fit, and the second support section and the second hole section are in a clearance sliding fit. There is always an axial clearance between the upper end of the second support section and the valve sleeve.

7. The electric valve according to claim 6, characterized in that, The valve core component also includes a filter component, which includes a filter element and a retaining ring. The valve core includes a filter component support portion, the retaining ring is seated on the filter component support portion, and the lower end of the elastic element is sleeved on the outside of the filter element.

8. The electric valve according to claim 7, characterized in that, The valve core includes a base, a first thin-walled portion and a second thin-walled portion. The first thin-walled portion is disposed on one side of the base, and the second thin-walled portion is disposed on the other side of the base. The base includes the filter component support portion. A guide section is included between the first thin-walled portion and the base. The fixing ring is axially limited between the lower end of the lower extension portion and the filter component support portion.

9. The electric valve according to claim 6, characterized in that, The valve core includes a base, a first thin-walled portion and a second thin-walled portion. The first thin-walled portion is disposed on one side of the base, and the second thin-walled portion is disposed on the other side of the base. One end of the elastic element abuts against the bearing seat, and the other end of the elastic element abuts against the upper end of the base.

10. The electric valve according to claim 5, characterized in that, The rotor component also includes a connector, which is fixedly connected to the valve sleeve. The connector is sleeved on the outer periphery of the lead screw, which includes a radial protrusion. The connector is axially limited between the radial protrusion and the bearing. When the electric valve is in the open state, the upper end of the outer ring of the bearing abuts against the connector. When the electric valve is in the closed state, there is a displacement between the upper end of the outer ring of the bearing and the connector.

11. The electric valve according to claim 4, characterized in that, The rotor is clearance-fitted with the upper valve body. The nut component includes a connecting frame fixedly connected to the nut. The connecting frame is fixedly connected to the connecting sleeve. The connecting sleeve is generally cylindrical and includes a first insertion part, a second insertion part, and a connecting part. The first insertion part is located inside the upper valve body, and the second insertion part is located inside the lower valve body. The outer diameter of the connecting part is larger than the outer diameter of the first insertion part and the outer diameter of the connecting part is larger than the outer diameter of the second insertion part. The connecting part is located between the upper valve body and the lower valve body. The first insertion part includes a first radial positioning part, and the second insertion part includes a second radial positioning part. The inner wall of the upper valve body is interference-fitted with the first radial positioning part, and the inner wall of the lower valve body is interference-fitted with the second radial positioning part. The upper valve body is welded to the connecting part, and the lower valve body is welded to the connecting part.

12. The electric valve according to claim 4, characterized in that, The rotor is clearance-fitted with the upper valve body. The nut component includes a connecting frame fixedly connected to the nut. The connecting frame is fixedly connected to the connecting sleeve. The connecting sleeve is generally cylindrical and includes a first insertion part, a second insertion part, and a connecting part. The first insertion part is located inside the upper valve body, and the second insertion part is located inside the lower valve body. The outer diameter of the connecting part is larger than the outer diameter of the first insertion part and the outer diameter of the connecting part is larger than the outer diameter of the second insertion part. The connecting part is located between the upper valve body and the lower valve body. The first insertion part includes a first radial positioning part, and the second insertion part includes a second radial positioning part. The inner wall of the upper valve body is interference-fitted with the first radial positioning part. The inner wall of the lower valve body is press-fitted with the second radial positioning part. The upper valve body is welded and fixed to the connecting part. The sealing component includes an upper limit member, a lower limit member, a sealing ring and a sliding plate disposed between the upper limit member and the lower limit member. The sealing ring is sleeved on the outer circumference of the sliding plate. The outer wall of the sealing ring is in contact with the inner wall of the first insertion part for sealing. The inner wall of the sliding plate is in contact with the outer wall of the valve core for sealing. The inner surface of at least one of the upper limit member, the sliding plate, and the lower limit member is plated with Ni-P-PTFE, DW, or DW+PTFE by a chemical composite method. The vertical distance between the lower end of the connecting sleeve and the central axis of the first connecting port is L. <L≤2.5mm。

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