Valve device

Abstract

According to the valve device, a rotor assembly comprises a first end and a second end, and the first end and the second end are oppositely arranged in the axial direction of the valve device; the valve device comprises a first limiting portion and a second limiting portion, at least part of the first end portion abuts against the first limiting portion, at least part of the second end portion abuts against the second limiting portion, and therefore axial displacement of the rotor assembly is limited, and miniaturization of the valve device is facilitated.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to a valve device. Background Art

[0002] The known valve device includes a rotor assembly, a screw rod and a nut seat. The rotor assembly and the screw rod are fixedly connected, the screw rod and the nut seat are threadedly connected, and the nut seat is fixedly connected to the valve seat. The rotation of the rotor assembly drives the screw rod to rotate. The screw rod and the nut seat are threadedly connected, the nut seat is fixed relative to the valve seat, and the screw rod moves axially relative to the nut seat along the valve device. The rotor assembly performs both rotational motion and axial movement, which is not conducive to the miniaturization of the valve device. Summary of the invention

[0003] The object of the present application is to provide a valve device that is conducive to miniaturization.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: a valve device includes a rotor assembly, a sleeve, a screw and a valve seat, at least part of the rotor assembly is located in the sleeve, the sleeve is fixedly connected to the valve seat, and the screw is transmission-connected to the rotor assembly; the rotor assembly includes a first end and a second end, and along the axial direction of the valve device, the first end and the second end are arranged back to back; the valve device includes a first limiting portion and a second limiting portion, at least part of the first end abuts against the first limiting portion, and at least part of the second end abuts against the second limiting portion, thereby limiting the axial displacement of the rotor assembly.

[0005] The present application provides a valve device, in which a rotor assembly includes a first end and a second end, and the first end and the second end are arranged back to back along the axial direction of the valve device; the valve device includes a first limiting portion and a second limiting portion, at least a portion of the first end abuts against the first limiting portion, and at least a portion of the second end abuts against the second limiting portion, thereby limiting the axial displacement of the rotor assembly, which is conducive to the miniaturization of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a schematic diagram of a first specific embodiment of a valve device;

[0007] Figure 2 for Figure 1 Schematic diagram of valve components;

[0008] Figure 3 for Figure 1 a schematic diagram of a support member of a valve device;

[0009] Figure 4 for Figure 1 a schematic diagram of a rotor assembly of a valve device;

[0010] Figure 5 for Figure 1 A schematic diagram of the structure of the sliding portion of the valve device;

[0011] Figure 6 for Figure 1 A schematic diagram of the structure of a valve seat of a valve device;

[0012] Figure 7 for Figure 3 A schematic diagram of a support member of the valve device from another perspective;

[0013] Figure 8 for Figure 1 A schematic diagram of the structure of the guide part and the sliding part of the valve device;

[0014] Fig. 9 for Figure 1 A schematic diagram of the structure of a screw rod and a valve core assembly of a valve device;

[0015] Fig.10 for Figure 1 A schematic structural diagram of another embodiment of a screw rod and a valve core assembly of a valve device;

[0016] Fig.11 for Figure 1 A schematic diagram of the structure of a valve body of a valve device;

[0017] Fig.12 for Figure 1 The valve device's valve port is in a fully closed state;

[0018] Fig.13 for Figure 1 The valve device's fully open state intention;

[0019] Fig.14 is a schematic diagram of a second specific embodiment of a valve device;

[0020] Fig.15 for Fig.14 a schematic diagram of a rotor assembly of a valve device;

[0021] Fig.16 for Fig.14 a schematic diagram of a support member of a valve device;

[0022] Fig.17 for Fig.14 A schematic structural diagram of a support member of the valve device from another perspective;

[0023] Fig.18 for Fig.14 A schematic diagram of the structure of a valve seat of a valve device;

[0024] Fig.19 for Fig.14 A schematic diagram of the structure of a screw rod and a valve core assembly of a valve device;

[0025] Fig. 20 for Fig.14 A schematic structural diagram of the screw rod and valve core assembly of the valve device from another perspective;

[0026] Fig.21 is a schematic diagram of a third specific embodiment of a valve device;

[0027] Fig. 22 for Fig.21 A schematic diagram of the structure of a valve seat of a valve device;

[0028] Fig.23 for Fig. 22 A schematic structural diagram of a valve seat of a valve device from another perspective;

[0029] Fig.24 A schematic diagram of another implementation of the third specific embodiment of the valve device;

[0030] Fig.25 for Fig.24 A schematic diagram of a rotor assembly;

[0031] Fig.26 for Fig.24 Schematic diagram of the valve seat. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0033] It should be understood that although the first, second, third, fourth, etc. may be used to describe various information in this application, these information should not be limited to these descriptions. These terms are only used to distinguish the same type of information from each other. Multiple means two or more. In the absence of conflict, the various embodiments in this application can complement each other.

[0034] Example 1

[0035] The valve device can be applied to a vehicle thermal management system or an air conditioning system. In the vehicle thermal management system, the valve device is often used as a throttling element or a switching element. An embodiment of the valve device, the valve device includes a valve component 20 and a stator component 10, the stator component 10 is located at the periphery of at least part of the valve component 20, the stator component 10 and the valve component 20 are fixedly or position-limitedly connected, further, a sealing arrangement can be provided between the stator component 10 and the valve component 20, which is beneficial to prevent water vapor or other impurities in the external environment from entering from the assembly gap between the stator component 10 and the valve component 20, causing corrosion or failure inside the stator component 10. The stator component 10 includes a coil assembly 11 and an injection molding part 12, the injection molding part 12 covers at least part of the coil assembly 11, that is, the stator component 10 is at least injection-molded with the coil assembly 11 as an insert, the stator component 10 has a first accommodating cavity 13 with an opening at the lower end, and the valve device is electrically connected and / or signal-connected to the outside world through the stator component 10.

[0036] Combination Figure 1-Figure 13 The valve device includes a rotor assembly 22, a sleeve 25, a screw 24 and a valve seat 21, at least part of the rotor assembly 22 is located in the sleeve 25, the sleeve 25 is fixedly connected to the valve seat 21, and the screw 24 is drivingly connected to the rotor assembly 22. The valve device also includes a support member 30, along the axial direction of the valve device, the rotor assembly 22 is close to the valve seat 21 relative to the support member 30, the support member 30 is fixedly connected or limitedly connected to the sleeve 25, and the valve seat 21 is fixedly connected to the sleeve 25; the valve device also includes a guide portion 41, a sliding portion 42 and a limiting hole 14, the guide portion 41 is slidably connected to the sliding portion 42, the guide portion 41 is located at one of the support member 30 and the rotor assembly 22, and the limiting hole 14 is located at the other of the support member 30 and the rotor assembly 22.

[0037] In this embodiment, the guide portion 41 is located at the support member 30, the limiting hole 14 is located at the rotor assembly 22, specifically, at least part of the sleeve 25 is located at the first accommodating chamber 13, the lower end of the sleeve 25 has a first opening 251, the first opening 251 is fixedly connected to the valve seat 21, the coil assembly 11 is located outside the sleeve 25, at least part of the rotor assembly 22 is located inside the sleeve 25, the rotor assembly 22 is transmission-connected with the screw 24, specifically, the rotor assembly 22 is threadedly connected with the screw 24, and the other end of the screw 24 is limitedly connected with the valve core assembly 23. When a predetermined current is passed through the coil assembly 11, an excitation magnetic field can be generated to drive the rotor assembly 22 to rotate, the rotor assembly 22 is threadedly connected with the screw 24, the screw 24 moves along the axial direction of the valve component 20, and the screw 24 is limitedly connected with the valve core assembly 23, that is, the screw 24 drives the valve core assembly 23 to move along the axial direction of the valve component 20, and converts the rotation of the rotor assembly 22 into the axial movement of the valve core assembly 23 relative to the valve seat 21. The valve member 20 also has a valve port 212, which is located at the valve seat 21, and the valve core assembly 23 can open or close the valve port 212, or adjust the flow area of ​​the valve port 212 to adjust the flow rate through the valve port 212. In the related art, the valve seat 21 is composed of at least two parts, namely, the valve seat 21 part and the valve seat 21 port part, and the valve seat 21 part and the valve seat 21 port part are fixedly connected or limitedly connected. In this embodiment, the valve seat 21 is an integrated structure, which is simple in structure, convenient in processing, and relatively low in manufacturing cost compared with the related art.

[0038] The valve member 20 further includes a support member 30, which is located inside the sleeve 25, and the support member 30 is fixedly connected or limitedly connected to the sleeve 25. It should be noted that fixed connection refers to fixing by welding, bonding, etc., and limited connection refers to connection by interference fit, snap-fit, plug-in, etc.; the upper end of the support member 30 abuts against the first wall portion 252 of the sleeve 25. It should be noted that the first wall portion 252 of the sleeve 25 is the wall portion opposite to the first opening portion 251 of the sleeve 25. Figure 4As shown, the rotor assembly 22 includes a magnet 221 and a nut seat 222, and the magnet 221 and the nut seat 222 are fixedly connected or limitedly connected or integrally structured. For example, the nut seat 222 is made of plastic material, and the nut seat 222 covers the magnet 221, that is, the rotor assembly 22 is injection molded with the magnet 221 as an insert. At least part of the rotor assembly 22 is located between the support member 30 and the valve seat 21, and the support member 30 and the valve seat 21 limit the axial displacement of the rotor assembly 22. In this embodiment, the rotor assembly 22 includes a first end 223 and a second end 224, and along the axial direction of the valve device, the first end 223 and the second end 224 are arranged opposite to each other, and the valve device includes a first limiting portion and a second limiting portion, and at least part of the first end 223 abuts against the first limiting portion, and at least part of the second end 224 abuts against the second limiting portion, thereby limiting the axial displacement of the rotor assembly. It should be noted that, due to machining accuracy and assembly errors, the above-mentioned abutment is not an absolute abutment, but within the tolerance range, or it can be understood that when the first end abuts the first limiting portion during assembly, the allowable matching tolerance of the second end and the second limiting portion is 0-0.2mm. Specifically, the nut seat 222 includes a groove cavity 226, and along the axial direction of the valve device, the groove cavity 226 has an opening, the opening faces the support member 30, at least part of the support member 30 is located in the groove cavity 226, the support member 30 has a flange portion 31, the flange portion 31 includes a first side wall portion 311 and a second side wall portion 312, the first side wall portion 311 of the flange portion 31 is interference fit with the inner wall portion of the sleeve 25, and the second side wall portion 312 of the flange portion 31 is matched with at least part of the first end 223 of the rotor assembly 22, so as to limit the axial movement of the rotor assembly 22, then in this embodiment, the first limiting portion is at least a part of the second side wall portion. The valve seat 21 has a third end 210. Along the axial direction of the valve device, the third end 210 is defined as an end of the valve seat close to the rotor assembly. At least part of the second end 224 abuts against the third end 210, and the second limiting portion is at least a part of the third end 210. Or in some other embodiments, the valve seat 21 has a positioning groove 213, and the positioning groove 213 is located at the third end 210 of the valve seat 21, that is, the positioning groove 213 is located at an end of the valve seat 21 close to the support member 30, and at least part of the second end 224 of the rotor assembly 22 is located in the positioning groove 213, that is, at least part of the second end 224 abuts against the bottom wall of the positioning groove 213, thereby limiting the axial displacement of the rotor assembly 22. It can also be understood that the second end 224 of the rotor assembly 22 has a positioning protrusion, that is, along the axial direction of the valve device, the positioning protrusion extends from the second end 224 to a direction away from the second end 224. Of course, in some other embodiments, the rotor assembly 22 has a positioning groove, the valve seat 21 has a positioning protrusion, and at least a portion of the positioning protrusion is located in the positioning groove 213 .In this embodiment, upper and lower limit methods are used to limit the axial movement of the rotor assembly 22. Of course, in some embodiments, the rotor assembly 22 can be axially limited by bearings. The bearings are located between the support member 30 and the rotor assembly 22, or the bearings are located between the rotor assembly 22 and the valve seat 21. As long as the rotor assembly 22 can only rotate without axial movement, the axial movement of the rotor assembly 22 is not absolutely limited. Within the tolerance range, the rotor assembly 22 can move up and down in a small range.

[0039] The rotor assembly 22 has a first mounting hole 225, which passes through the first end 223 and the second end 224 of the rotor assembly 22 along the axial direction of the valve member 20. The support member 30 has a second mounting hole 33, which passes through the upper and lower ends of the support member 30 along the axial direction of the valve device. The first mounting hole 225 and the second mounting hole 33 are coaxially or substantially coaxially arranged, and at least part of the screw rod 24 is located in the first mounting hole 225 and the second mounting hole 33. The rotor assembly 22 has an internal thread, which is located at the wall portion forming the first mounting hole 225. The outer wall of the screw rod 24 is provided with an external thread. The internal thread of the rotor assembly 22 cooperates with the external thread of the screw rod 24, so that the rotational motion of the rotor assembly 22 is converted into the axial movement of the screw rod 24. In the present application, the thread is arranged on the rotor assembly 22, that is, the nut seat 222. In the related art, the nut seat is relatively fixed to the valve seat or the nut seat is fixed to the valve body. The rotor assembly includes a connecting piece (carrying part of the function of the nut seat in the present application) and a magnet. The rotor assembly and the screw rod are relatively fixed and rotate and move. Compared with the related art, the present application omits the connecting piece, the number of parts is relatively small, and the structure is simpler.

[0040] Specifically, at least part of the second mounting hole 33 has a non-circular cross section in a cross section perpendicular to the axial direction of the valve device, such as Figure 3As shown, the second mounting hole 33 of the support member 30 includes a first hole section 331 and a second hole section 332. Along the axial direction of the valve component 20, the second hole section 332 is close to the first mounting hole 225 relative to the first hole section 331, and the aperture of the second hole section 332 is greater than or equal to the aperture of the first hole section 331, that is, a plane perpendicular to the axial direction of the valve device is defined as a first plane. Along the axial direction of the valve component 20, the projection of the wall forming the first hole section 331 on the first plane is located on the inner side of the projection of the wall forming the second hole section 332 on the first plane, and the projection of the wall forming the first hole section 331 on the first plane is non-circular. Specifically, the wall forming the first hole section 331 includes a first wall 3311, the first wall 3311 is a plane wall, and the rest of the walls forming the first hole section 331 are arcuate walls; the wall forming the first hole section 331 also includes a second wall 3312, the first wall 3311 is parallel or approximately parallel to the second wall 3312, and the rest of the walls forming the second hole section 332 are arcuate walls. The screw rod 24 includes a first section and a second section, wherein the first section of the screw rod 24 is located in the first hole section 331, and the projection of the first section of the screw rod 24 on the first plane is the same as or similar to the projection of the wall forming the first hole section 331 on the first surface, and the first hole section 331 of the support member 30 cooperates with the first section of the screw rod 24 to limit the rotation of the screw rod 24 along the axial direction of the valve device. Through the limit matching of the non-circular cross section, the structure is simple and the processing is convenient. Of course, in some other embodiments, the limit protrusion is located on the outer wall of the screw rod 24, and the limit groove is located on the wall portion of the second mounting hole 33 formed on the support member 30; or the limit protrusion is located on the wall portion of the second mounting hole 33 formed on the support member 30, and the limit groove is located on the outer wall of the screw rod 24, and the limit protrusion and the limit groove cooperate to limit the rotation of the screw rod 24 along the axial direction. In the present application, the limit structure is arranged on the support member 30, and there is no need to set up a part to prevent the screw rod 24 from rotating, which is conducive to the simple structure and miniaturization of the valve device.

[0041] The valve component 20 includes a guide portion 41 and a sliding portion 42. The guide portion 41 includes a guide groove 411. The guide groove 411 has an opening along the axial direction of the valve device. The valve device also includes a limiting hole 14. One end of the sliding portion 42 is located in the guide groove 411 and is slidably connected to the guide groove 411. The other end of the sliding portion 42 is limitedly connected to the limiting hole 14. The guide portion 41 and the support member 30 are an integral structure. The guide portion 41 is located at the lower end of the support member 30. The guide groove 411 is recessed from the lower end of the support member 30 toward the upper end of the support member 30 along the axial direction of the valve device. It should be noted that the guide portion 41 and the support member 30 can be a split structure. Along the axial direction of the valve device, the support member 30 is located on one side of the guide portion 41, and at least part of the rotor assembly 22 is located on the other side of the guide portion 41. The support member 30 is fixedly connected to the guide portion 41, wherein the fixed connection refers to fixing by welding, bonding, thread locking, etc. The guide groove 411 has a first limiting end 4111 and a second limiting end 4112. Along the radial direction of the valve device, the first limiting end 4111 is closer to the axis of the valve device relative to the second limiting end 4112, and the guide groove 411 extends from the first limiting end 4111 to the second limiting end 4112 in a spiral shape. One end of the sliding portion 42 is located in the guide groove 411, and the other end of the sliding portion 42 is limitedly connected to the rotor assembly 22. The rotor assembly 22 has a limiting hole 14, which can be a blind hole or a through hole. Along the axial direction of the valve component 20, the opening of the limiting hole faces the guide groove 411, and at least part of the sliding portion 42 is located in the limiting hole. The sliding portion 42 includes a first connection portion 421, a second connection portion 422 and a third connection portion 423, wherein the second connection portion 422 is located between the first connection portion 421 and the second connection portion 422, at least a portion of the first connection portion 421 is located in the guide groove 411, and at least a portion of the third connection portion 423 is located in the limiting hole, that is, the first connection portion 421 is bent relative to the second connection portion 422 toward the direction of the support member 30, and the third connection portion 423 is bent relative to the second connection portion 422 toward the direction of the limiting hole 14. It can be understood that the bending direction of the first connection portion 421 is opposite to the bending direction of the third connection portion 423. It should be noted that at least the third connection portion 423 is located in the limiting hole of the rotor assembly 22, that is, the limiting hole limits the radial displacement of the third connection portion 423, and the third connection portion 423 is rotatable in the limiting hole.When the valve device is working, one of the first limit end 4111 and the second limit end 4112 of the guide groove 411 is the starting position of the sliding part 42. For the convenience of explanation, it is defined that when the valve component 20 is closed, the sliding part 42 is located at the first limit end 4111 of the guide groove 411. When the valve device receives a signal, a predetermined current is passed through the coil assembly 11 to generate an excitation magnetic field, driving the rotor assembly 22 to rotate. The sliding part 42 rotates with the rotor assembly 22 driven by the rotor assembly 22. The support member 30 and the sleeve 25 have an interference fit, and the guide part 41 is relatively stationary. The first connecting part 421 of the sliding part 42 slides along the guide part 41. When the first connecting part 421 of the sliding part 42 slides to the second limit end 4112, the sliding part 42 stops moving, which will limit the continued movement of the rotor assembly 22. The position states of the sliding part 42 at the first limit end 4111 and the second limit end 4112 are shown in the figure. In the related art, the guide portion is spirally shaped, and the guide portion is sleeved on the screw rod and arranged along the axial direction of the valve component. The stop assembly includes a spiral guide portion, a slip ring and a push rod. The structure of the stop assembly in the present application is relatively simple, and the guide portion is arranged along the radial direction of the valve component, which reduces the volume of the valve component 20 to a certain extent.

[0042] In some other embodiments, the guide portion 41 is located at the rotor assembly 22, and the limiting hole 14 is located at the support member 30; the guide portion 41 and the rotor assembly 22 are an integral structure, that is, the guide portion 41 is located at the first end portion 223 of the rotor assembly 22, and along the axial direction of the valve device, the guide groove 411 is recessed from the first end portion 223 toward a direction away from the first end portion 223; the guide portion 41 and the rotor assembly 22 are a split structure, and the guide portion 41 is fixedly connected to the rotor assembly 22.

[0043] In the present application, the screw rod 24 is limitedly connected with the valve core assembly 23, and the screw rod 24 drives the valve core assembly 23 to move axially along the valve component 20. The valve core assembly 23 includes a valve needle 231 and an elastic element 234; Fig. 9As shown, the screw rod 24 has a third accommodating cavity 243, and the third accommodating cavity 243 has an opening in the direction toward the valve needle 231. The elastic element 234 is located in the third accommodating cavity 243, and at least part of the valve needle 231 is located in the third accommodating cavity 243. One end of the elastic element 234 abuts against the top of the valve needle 231. In the present application, the screw rod 24 and the valve needle 231 are clamped by riveting. Specifically, the valve needle 231 has a first matching portion 2311, and the first matching portion 2311 is located at one end of the valve needle 231 close to the elastic element 234. The screw rod 24 has a second matching portion 244. Along the axis of the valve component 20, the second matching portion 244 is relatively far away from the elastic element 234 relative to the first matching portion 2311, that is, the lower end surface of the first matching portion 2311 abuts against the upper end surface of the second matching portion 244, and the side wall portion of the first matching portion 2311 and the side wall portion of the second matching portion 244 are gap-matched. During the assembly process, the elastic element 234 is installed into the accommodating cavity of the screw rod 24, and then the opening of the screw rod 24 is bent inward by riveting to abut against the first matching portion 2311 of the valve needle 231. The elastic element 234 of the present application is a spring. When the valve device is working, the elastic element 234 is in a compressed state in the accommodating cavity. The main function of the elastic element 234 is to provide pressure to the valve needle 231 when closing the valve, so as to prompt the valve needle 231 to close the valve quickly. Specifically, when the valve device is opening the valve, the first matching portion 2311 and the second matching portion 244 are in contact with each other, and the screw rod 24 drives the valve needle 231 to move upward. When the valve device is closing the valve, the screw rod 24 moves downward along the axial direction of the valve component 20, and the compressed spring releases the elastic force, so as to prompt the valve needle 231 to close the valve quickly. Of course, in some other embodiments, such as Fig.10 As shown, the valve needle 231 has a receiving cavity, the opening of the receiving cavity faces the screw rod 24, and the elastic element 234 is located in the receiving cavity. The assembly method is the same as the above method and is not described in detail.

[0044] Combination Figure 11-13 The present invention also provides an embodiment of an electric valve, the electric valve includes the aforementioned valve device. The electric valve includes a valve body 60, the valve body 60 has a third installation cavity 61, part of the valve device is located in the third installation cavity 61, the valve body 60 includes a first flow channel 62 and a second flow channel 63, the first flow channel 62 and the second flow channel 63 are connected through the valve device, the valve device cooperates with the valve core assembly 23 and the valve port 212 to adjust the flow rate of the working medium between the first flow channel 62 and the second flow channel 63, and the working medium includes a refrigerant. In this embodiment, a first sealing ring 50 and a second sealing ring 51 are provided between the side wall forming the third installation cavity 61 and the valve seat 21, and the first sealing ring 50 and the second sealing ring 51 are respectively placed on both sides of the valve port 212 to prevent leakage of the medium.

[0045] Example 2

[0046] Combination Figure 14-Figure 20The rotor assembly 22 is located inside the sleeve 25, at least part of the valve seat 21 is located inside the sleeve 25, the valve seat 21 is fixedly connected to the sleeve 25, the valve seat 21 includes a mounting groove 211, at least part of the support member 30 is located in the mounting groove 211, the support member 30 is fixedly connected or limit-connected to the valve seat 21, and along the axial direction of the valve device, at least part of the stop assembly is located between the rotor assembly 22 and the support member 30; the valve device includes a guide portion 41 and a sliding portion 42. In this embodiment, the guide portion 41 is located at one of the rotor assembly 22 and the support member 30, one end of the sliding portion 42 is slidably connected to the guide portion 41, and the other end of the sliding portion 42 is limit-connected to the other one of the rotor assembly 22 and the support member 30.

[0047] In this embodiment, the valve seat 21 includes a mounting groove 211, and along the axial direction of the valve device, the mounting groove 211 is recessed from the third end 210 of the valve seat 21 to a direction away from the third end 210, at least part of the support member 30 is located in the mounting groove 211, and the support member 30 is limitedly connected or fixedly connected to the valve seat 21. The support member 30 and the valve seat 21 can be fixed by welding, bonding, interference fit, etc., or limitedly connected by clamping, threading, etc. The mounting groove 211 has a first mounting cavity 2111 and a second mounting cavity 2112. Along the radial direction of the support member 30, the second mounting cavity 2112 is located on the outside of the first mounting cavity 2111; the surface perpendicular to the valve device is defined as the first surface, and the projections of the wall forming the first mounting cavity 2111 and the wall forming the second mounting cavity 2112 on the first surface do not overlap. The support member 30 includes a main body portion 32 and a flange portion 31. Along the radial direction of the support member 30, the flange portion 31 is located on the outside of the main body portion 32, at least part of the main body portion 32 is located in the first mounting cavity 2111, and at least part of the flange portion 31 is located in the second mounting cavity 2112, thereby limiting the axial rotation of the support member 30.

[0048] In order to prevent the screw rod 24 from driving the valve core assembly 23 to rotate during the axial movement of the valve device, the support member 30 includes a second mounting hole 33, which is located in the main body 32, and the second mounting hole 33 passes through the upper and lower ends of the main body 32, and at least part of the screw rod 24 is located in the second mounting hole 33. The first mounting hole 225 is coaxially or approximately coaxially arranged with the second mounting hole 33, and approximately coaxial means within the tolerance range. The support member 30 includes a limiting protrusion 34, which extends from the wall forming the second mounting hole 33 to the axis of the valve device along the radial direction of the valve device, and passes through the upper and lower end surfaces of the main body 32 along the axial direction of the support member 30. The screw rod 24 has a limiting groove 242, which is located on the outer wall of the screw rod 24. The limiting groove 242 is recessed from the outer wall of the screw rod 24 to the direction away from the outer wall of the screw rod 24. At least part of the limiting protrusion 34 is located in the limiting groove 242, and the limiting protrusion 34 cooperates with the limiting groove 242 to limit the rotation of the screw rod 24. Of course, in other embodiments, the limiting protrusion and the limiting groove can be interchanged, that is, the limiting protrusion is located on the screw rod 24, and the limiting groove is located on the support member 30. In some embodiments, the second mounting hole 33 is a non-circular hole, that is, the projection of the wall forming the second mounting hole 33 in the cross section perpendicular to the axial direction of the valve component 20 is non-circular, and the part of the screw rod 24 that cooperates with the support member 30 cooperates with the shape of the second mounting hole 33, thereby limiting the axial rotation of the screw rod 24.

[0049] Along the axial direction of the valve device, the rotor assembly 22 is located in the second accommodating cavity 253 of the sleeve 25, and the rotor assembly 22 is close to the first wall portion 252 of the sleeve 25 relative to the valve seat 21, and the sleeve 25 and the valve seat 21 limit the axial displacement of the rotor assembly 22. In this embodiment, the rotor assembly 22 includes a magnet 221 and a nut seat 222, and the magnet 221 and the nut seat 222 are fixedly connected or limitedly connected or have an integral structure. For example, the nut seat 222 is made of plastic material, and the nut seat 222 covers the magnet 221, that is, the rotor assembly 22 is injection molded with the magnet 221 as an insert. Along the axial direction of the valve device, the nut seat 222 has a first end 223 and a second end 224, the second end 224 is close to the valve seat 21 relative to the first end 223, the sleeve 25 includes a first wall portion 252, along the axial direction of the valve component 20, the first wall portion 252 is arranged opposite to the first opening portion 251, the first end 223 of the nut seat 222 abuts against the first wall portion 252 of the sleeve 25, and the second end 224 of the nut seat 222 abuts against or fits with a small gap against the valve seat 21. In this embodiment, the upper and lower limit methods are used to limit the axial movement of the rotor assembly 22. In the implementation application, due to the processing accuracy and assembly error, the above-mentioned abutment is not an absolute abutment, and it can be within the tolerance range, or it can be understood that when the first end abuts against the first limit portion during assembly, the allowable matching tolerance of the second end and the second limit portion is 0-0.2mm. Of course, in some embodiments, the rotor assembly 22 can be axially limited by bearings, and the bearings are located between the rotor assembly 22 and the valve seat 21. As long as the rotor assembly 22 can only rotate without axial movement, the axial movement of the rotor assembly 22 is limited, which does not mean that it will not move absolutely. Within the tolerance range, the rotor assembly 22 can move up and down in a small range.

[0050] The nut seat 222 also includes a groove cavity 226, and the groove cavity 226 has an opening along the axial direction of the valve member 20, and the opening faces the first wall portion 252. The nut seat 222 includes a first mounting hole 225, and the first mounting hole 225 penetrates the bottom wall and the second end portion 224 forming the groove cavity 226 along the axial direction of the valve member 20, and at least part of the screw rod 24 is located in the first mounting hole 225. The rotor assembly 22 has an internal thread, and the internal thread is located in the wall portion forming the first mounting hole 225. The outer wall of the screw rod 24 has an external thread. The internal thread of the rotor assembly 22 cooperates with the external thread of the screw rod 24, so that the rotational motion of the rotor assembly 22 is converted into the axial movement of the screw rod 24. In the present application, the thread is arranged on the nut seat 222, that is, the nut seat 222 is a part of the rotor assembly 22. In the related art, the nut seat is relatively fixed to the valve seat or the nut seat is fixed to the valve body. The rotor assembly includes a connecting piece (carrying part of the function of the nut seat in the present application) and a magnet. The rotor assembly and the screw rod are relatively fixed and rotate and move. Compared with the related art, the present application omits the connecting piece, the number of parts is relatively small, and the structure is simpler.

[0051] The valve core assembly 23 includes a valve needle 231 and an elastic element 234. The valve needle 231 includes a valve stem 2310 and a valve head 2312. The valve stem 2310 and the valve head 2312 can be separate structures, fixed by welding, clamping, bonding, etc. The valve stem 2310 and the valve head 2312 can also be an integral structure. In this embodiment, the valve stem 2310 and the valve head 2312 are an integral structure. The screw rod 24 includes a third mounting hole 241. Along the axial direction of the valve device, the third mounting hole 241 passes through the upper and lower ends of the screw rod 24. At least part of the valve stem 2310 is located in the third mounting hole 241, and one end of the valve stem 2310 passes through the third mounting hole 241 of the screw rod 24. The valve component 20 also includes a retaining ring 26. The main function of the retaining ring 26 is to limit the relative displacement between the screw rod 24 and the valve stem 2310. Specifically, the valve stem 2310 has a groove, which is located at the end of the valve stem 2310 away from the valve head 2312. Along the radial direction of the valve stem 2310, the groove is recessed from the outer wall of the valve stem 2310 to the direction away from the outer wall, that is, along the radial direction of the valve device, the groove has an opening, and at least part of the retaining ring 26 is located in the groove. During assembly, the upper end of the retaining ring 26 abuts against the upper side wall of the groove, and the lower end of the retaining ring 26 abuts against the lower side wall of the groove, or the lower end of the retaining ring 26 abuts against the upper end of the screw rod 24. Along the axial direction of the valve component 20, the elastic element 234 is located between the screw rod 24 and the valve head 2312, and the elastic element 234 is sleeved on the valve stem 2310, one end of the elastic element 234 abuts against the lower end of the valve stem 2310, and the other end of the elastic element 234 abuts against the upper end of the valve head 2312. In the present application, the elastic element 234 is a spring. When the valve device is working, the elastic element 234 is in a compressed state. The main function of the elastic element 234 is to provide pressure to the valve needle 231 when closing the valve, so as to prompt the valve needle 231 to close the valve quickly. Specifically, when the valve device is opening the valve, the upper end of the retaining ring 26 abuts against the upper side wall of the groove, and the screw rod 24 drives the valve needle 231 to move upward. When the valve device is closing the valve, the screw rod 24 moves downward along the axial direction of the valve component 20, and the spring in a compressed state releases elastic force, prompting the valve needle 231 to close the valve quickly. The valve needle 231 assembly of the present application has a simple structure and is easy to process and manufacture.

[0052] In this embodiment, the structures of the guide portion 41, the sliding portion 42, and the limiting hole 14 are the same or similar to those in the embodiment 1, and are not described in detail here. The difference is that in this embodiment, the guide portion 41 and the rotor assembly 22 are an integral structure, the guide portion 41 is located at the second end 224 of the rotor assembly 22, and along the axial direction of the valve device, the guide groove 411 is recessed from the second end 224 to the first end 223. Of course, the guide portion 41 and the rotor assembly 22 can also be a split structure, along the axial direction of the valve device, the rotor assembly 22 is located on one side of the guide portion 41, the support member 30 is located on the other side of the guide portion 41, and the rotor assembly 22 is fixedly connected to the guide portion 41. One end of the sliding portion 42 is located in the guide groove 411, and the other end of the sliding portion 42 is limitedly connected to the support member 30. The support member 30 has a limiting hole 14, which can be a blind hole or a through hole. Along the axial direction of the valve device, the opening of the limiting hole faces the guide groove 411, and at least part of the sliding portion 42 is located in the limiting hole.

[0053] In some other embodiments, the guide portion 41 is located on the support member 30, and the limiting hole 14 is located on the rotor assembly 22; the guide portion 41 and the support member 30 are an integral structure, that is, the guide portion 41 is located at the upper end of the support member 30; or, the guide portion 41 and the support member 30 are split structures, and the guide portion 41 is fixedly connected to the support member 30.

[0054] Example 3

[0055] Combination Figure 21-26 A valve device includes a rotor assembly 22, a guide portion 41, a sliding portion 42 and a valve seat 21. Along the axial direction of the valve device, the rotor assembly 22 is located on one side of the guide portion 41, and the valve seat 21 is located on the other side of the guide portion 41. The guide portion 41 includes a first limiting end 4111 and a second limiting end 4112. The guide portion 41 is arranged along the radial direction of the valve device. The guide portion 41 is located at one of the rotor assembly 22 and the valve seat 21. One end of the sliding portion 42 is slidably connected to the guide portion 41, and the other end of the sliding portion 42 is limitedly connected or fixedly connected to the other of the rotor assembly 22 and the valve seat 21; when the sliding portion 42 abuts against one of the first limiting end 4111 and the second limiting end 4112, the rotor assembly 22 stops rotating. The main difference between this embodiment and embodiment 2 is that the support member is omitted, and the function of the support member is achieved by changing the structure of the valve seat 21, so that the structure of the valve device is simpler.

[0056] Specifically, the valve seat 21 includes a second mounting hole 215, which is recessed from the third end 210 of the valve seat 21 in the axial direction of the valve member 20 toward a direction away from the third end 210, and at least part of the screw rod 24 is located in the second mounting hole 215, and the screw rod 24 is slidably connected to the valve seat 21. Driven by the rotor assembly 22, the screw rod 24 moves along the axis of the valve device to open or close the valve port 212. In order to limit the circumferential rotation of the valve core assembly 23, a limiting structure is provided on the screw rod 24 and the valve seat 21. Specifically, the valve seat 21 includes a limiting protrusion 214, which extends inward from the wall forming the second mounting hole 215 in the radial direction of the valve seat 21. The screw rod 24 has a limiting groove 242, which is located on the outer wall of the screw rod 24. The limiting groove 242 is recessed from the outer wall of the screw rod 24 to the direction away from the outer wall of the screw rod 24. At least part of the limiting protrusion 214 is located in the limiting groove 242, and the limiting protrusion 214 cooperates with the limiting groove 242 to limit the rotation of the screw rod 24. Of course, in other embodiments, the limiting protrusion 214 and the limiting groove 242 can be interchanged, that is, the limiting protrusion is located on the screw rod 24, and the limiting groove is located on the valve seat 21. In some embodiments, the projection of the side wall forming the second mounting hole 215 in the cross section perpendicular to the axial direction of the valve component 20 is non-circular, and the part of the screw rod 24 that matches the valve seat 21 matches the cross-sectional shape of the second mounting hole 215, thereby limiting the axial rotation of the screw rod 24. In the present application, the valve seat 21 is an integrated structure, and a limiting structure is set on the valve seat 21, which omits the anti-rotation part in the related art and simplifies the structure of the valve device.

[0057] The sliding part 42 is slidably connected with the guide part 41. The guide part 41 is located at the end of the rotor assembly 22 close to the valve seat 21, and the guide part 41 is arranged along the radial direction of the rotor assembly 22; the guide part 41 and the rotor assembly 22 are an integral structure, or the guide part 41 and the rotor assembly 22 are a split structure, and the guide part 41 and the rotor assembly 22 are fixedly connected. Specifically, the guide part 41 and the nut seat 222 of the rotor assembly 22 can be fixedly connected by welding or bonding, or the guide part 41 and the nut seat 222 of the rotor assembly 22 can be connected by clamping, plugging, etc. In this embodiment, the guide part 41 and the rotor assembly 22 are an integral structure. Specifically, along the axial direction of the valve device, the guide part 41 is located at the second end 224 of the rotor assembly 22, and the valve seat 21 has a limiting hole 14, which can be a blind hole or a through hole. Along the axial direction of the valve component 20, the opening of the limiting hole faces the guide groove 411, and at least part of the sliding part 42 is located in the limiting hole.

[0058] In some other embodiments, the guide portion 41 is arranged at a different position. In this embodiment, the guide portion 41 is located at the third end portion 210 of the valve seat 21, and the guide portion 41 is arranged along the radial direction of the valve seat 21; the guide portion 41 and the valve seat 21 are an integral structure and can be integrally formed, or the guide portion 41 and the valve seat 21 are a separate structure, and the guide portion 41 and the valve seat 21 are fixedly connected or limitedly connected. Specifically, the guide portion 41 and the valve seat 21 can be fixedly connected by welding or bonding, or the guide portion 41 and the valve seat 21 can be limitedly connected by clamping, plugging, etc. The guide portion 41 has a guide groove 411, and the guide groove 411 is arranged in a spiral shape along the radial direction of the guide portion 41, and at least part of the sliding portion 42 is located in the guide groove 411. The other end of the sliding portion 42 is limitedly connected to the rotor assembly 22. Specifically, the rotor assembly 22 includes a limiting hole, that is, the limiting hole is located at the nut seat 222 of the rotor assembly 22, and the opening of the limiting hole faces the valve seat 21.

[0059] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A valve device, characterized in that: The invention comprises a rotor assembly (22), a sleeve (25), a screw rod (24) and a valve seat (21), wherein at least a portion of the rotor assembly (22) is located in the sleeve (25), the sleeve (25) is fixedly connected to the valve seat (21), and the screw rod (24) is drivingly connected to the rotor assembly (22); the rotor assembly (22) comprises a first end portion (223) and a second end portion (224), and along the axial direction of the valve device, the first end portion (223) and the second end portion (224) are arranged opposite to each other; the valve device comprises a first limiting portion and a second limiting portion, wherein at least a portion of the first end portion (223) abuts against the first limiting portion, and at least a portion of the second end portion (224) abuts against the second limiting portion.

2. The valve device according to claim 1, characterized in that The first limiting portion is located inside the sleeve (25), and the first limiting portion and the sleeve (25) are fixedly connected or are an integral structure.

3. The valve device according to claim 2, characterized in that The sleeve (25) comprises a first wall portion (252) and a first opening portion (251); along the axial direction of the valve device, the first wall portion (252) and the first opening portion (251) are arranged opposite to each other, and the first limiting portion is at least a part of the first wall portion (252).

4. The valve device according to claim 2, characterized in that The valve device comprises a support member (30), wherein the support member (30) is located in the sleeve (25); the rotor assembly (22) comprises a groove cavity (226), wherein at least a portion of the support member (30) is located in the groove cavity (226); the support member (30) comprises a first side wall portion (311) and a second side wall portion (312); the first side wall portion (311) is fixedly connected to the sleeve (25), the second side wall portion (312) is abutted against a first end portion (223) of the rotor assembly (22), and the first limiting portion is at least a portion of the second side wall portion (312).

5. The valve device according to claim 1, characterized in that The second limiting portion is located on the valve seat (21), and the valve seat (21) includes a third end portion (210). Along the axial direction of the valve device, at least a portion of the second end portion (224) abuts against the third end portion (210), and the second limiting portion is at least a portion of the third end portion (210).

6. The valve device according to claim 5, characterized in that The valve seat (21) has a positioning groove (213), the positioning groove (213) is located at the third end (210), at least a portion of the second end (224) of the rotor assembly (22) is located in the positioning groove (213), and the second limiting portion is the positioning groove (213) of the third end (210).

7. The valve device according to claims 1 to 6, characterized in that The valve device comprises a valve core assembly (23), the screw rod (24) is fixedly connected or limit-connected to the valve core assembly (23), the rotor assembly (22) comprises a first mounting hole (225), at least a portion of the screw rod (24) is located in the first mounting hole (225), and the screw rod (24) is threadedly connected to the rotor assembly (22).

8. The valve device according to claim 7, characterized in that The first mounting hole (225) passes through the first end (223) and the second end (224); the rotor assembly (22) has an internal thread, the internal thread is located on the wall forming the first mounting hole (225); the screw rod (24) has an external thread, and the external thread is located on the outer wall of the screw rod (24).

9. The valve device according to claim 8, characterized in that The valve device comprises a guide portion (41) and a sliding portion (42), wherein the guide portion (41) comprises a guide groove (411), and the guide groove (411) has an opening along the axial direction of the valve device; the valve device also comprises a limiting hole (14), one end of the sliding portion (42) is located in the guide groove (411) and is slidably connected to the guide groove (411), and the other end of the sliding portion (42) is limitedly connected to the limiting hole (14).

10. The valve device according to claim 9, characterized in that The guide portion (41) is located at one of the valve seat (21) and the rotor assembly (22), and the limiting hole (14) is located at the other of the valve seat (21) and the rotor assembly (22). The guide groove (411) has a first limiting end (4111) and a second limiting end (4112). Along the radial direction of the valve device, the first limiting end (4111) is closer to the axis of the valve device relative to the second limiting end (4112), and the guide groove (411) extends from the first limiting end (4111) to the second limiting end (4112) in a spiral shape.

11. The valve device according to any one of claims 8 to 10, characterized in that: The sliding portion (42) comprises a first connecting portion (421), a second connecting portion (422) and a third connecting portion (423), at least a portion of the first connecting portion (421) is located on the guiding portion (41), the first connecting portion (421) is bent relative to the second connecting portion (422) in the direction of the guiding portion (41), and the third connecting portion (423) is bent relative to the second connecting portion (422) in the direction of the limiting hole (14).

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