Electric valve

Abstract

The invention discloses an electric valve, comprising: a valve body, comprising a valve seat and a cover, the valve seat is provided with a valve cavity extending along its axial direction, the lower end of the valve cavity is formed as a valve port; a nut, the nut is formed into a columnar shape, a channel penetrating along its axial direction is defined in the nut, the lower end of the nut is plugged into the valve cavity and the channel is connected to the valve cavity; a cover shell, defining a chamber with an open lower end, the lower end of the cover shell is connected to the cover; a screw shaft, the screw shaft comprises a screw and a shaft, the lower end of the shaft is connected to the upper end of the screw, the screw is formed into a columnar shape and is arranged in the channel extending along the axial direction of the nut; a valve needle, the upper end of the valve needle is connected to the lower end of the screw, the lower end of the valve needle passes through the valve port, and the valve needle is movable along the axial direction of the valve cavity to adjust the fluid flow passing through the valve port; a rotor assembly, the rotor assembly is arranged in the chamber, the rotor assembly is connected to the screw shaft to drive the screw to move along the axial direction of the valve cavity; a stop assembly. The electric valve has the advantages of reasonable structure, long service life, good performance, low cost, easy manufacturing, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration equipment, and more specifically, relates to an electric valve that can be used in a refrigeration system. Background Art

[0002] The electric valve installed and used in refrigeration systems such as air conditioners and refrigerators is a structure for adjusting the flow of refrigerant fluid. It usually includes a cover, a valve seat and a rotor device. A valve needle component is provided in the valve chamber of the electric valve. The rotor device drives the magnetic rotor and the screw rod connected to it through a coil. The screw rod drives the valve needle component to move axially through a threaded structure, so that the valve needle controls the size of the valve port opening, thereby controlling the flow of the fluid through the valve port.

[0003] In order to accurately set the screw rotation reference point and limit the lower stop position and upper stop position of the valve needle within the flow control range, a stop mechanism for limiting the rotor rotation range is usually provided, such as the electric valve with publication number CN102767636A. Figure 1 As shown, the cover comprises an outer shell and a core shaft welded and fixed on the top of the outer shell. The core shaft, spring guide rail, slip ring and stop rod form a stop mechanism. The spring guide rail is fixed on the core shaft. The slip ring slides freely on the spring guide rail. When the rotor rotates, the stop rod arranged on the rotor device contacts the protrusion of the slip ring, driving the slip ring to slide on the spring guide rail, and respectively contacts the two ends of the spring guide rail and cannot rotate, thereby forming upper and lower stop positions, thereby realizing the control function of the above flow range.

[0004] However, the upper and lower stop mechanisms of the rotor device composed of the spring guide rail, slip ring and stop rod of the above electric valve are arranged at the top of the rotor device, which is farthest from the meshing position between the nut and the screw rod. When the rotor device is running up and down, the contact blocking force of the stop rod, the slip ring and the spring guide rail is amplified by the lever effect, causing the rotor assembly to be eccentric. Therefore, impact vibration is generated at the moment when the rotor device stops, causing the electric valve to produce noise and wear at the meshing position, thereby reducing the service life of the electric valve. At the same time, in order to install the core shaft for fixing the slip ring and the spring guide rail, a through hole must be made at the top end of the shell. After the core shaft and the through hole of the shell are installed, the seal is fixedly welded at the joint. Therefore, the leakage probability of refrigerant at the weld and the processing cost are increased. Due to the heat effect of welding, the metal around the weld is annealed and softened, thereby reducing the pressure resistance of the shell. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the present invention proposes an electric valve, which has a reasonable structure, a long service life, low noise, low cost and easy manufacturing.

[0007] According to an embodiment of the present invention, an electric valve comprises: a valve body, the valve body comprises a valve seat and a cover cover, the valve seat is provided with a valve cavity extending along its axial direction, and the lower end of the valve cavity is formed as a valve port; a nut, the nut is formed into a columnar shape, a channel is defined in the nut which passes through the axial direction thereof, the lower end of the nut is inserted into the valve cavity and the channel is connected to the valve cavity; a cover shell, a chamber with an open lower end is defined in the cover shell, and the lower end of the cover shell is connected to the cover cover; a screw shaft, the screw shaft comprises a screw and a shaft, the lower end of the shaft is connected to the upper end of the screw, the screw is formed into a columnar shape and is arranged in the channel along the axial direction of the nut; a valve needle, the upper end of the valve needle is connected to the lower end of the screw, and the lower end of the valve needle passes through the valve port , the valve needle is movable along the axial direction of the valve cavity to adjust the fluid flow through the valve port; a rotor assembly, the rotor assembly is arranged in the chamber, the rotor assembly is connected to the screw shaft to drive the screw to move along the axial direction of the valve cavity, the rotor assembly comprises: a connecting plate, the connecting plate is provided with a mounting hole passing through the thickness direction thereof, the upper end of the shaft passes through the mounting hole and is fixedly connected to the connecting plate; a magnetic ring, the magnetic ring is a hollow columnar shape coaxial with the screw shaft and is sleeved on the outer circumference of the screw shaft, the upper end of the magnetic ring is fixedly connected to the connecting plate; a stop assembly, at least a part of the stop assembly is connected to the valve seat, and at least another part is connected to the screw shaft to limit the range of motion of the screw shaft.

[0008] According to the electric valve of the embodiment of the present invention, by connecting the lower end of the shaft to the screw rod and connecting the screw rod shaft to the connecting plate of the rotor assembly, not only the distance between the lower end of the stop assembly and the meshing point of the shaft screw rod and the nut is shortened, but also the eccentricity and vibration of the rotor caused by the stopping force are reduced, the noise during operation is reduced, and the service life is extended. At the same time, there is no need to open a hole at the top of the cover shell to install a fixed screw rod shaft, which reduces the probability of refrigerant leakage at the weld and the processing cost, and avoids the problem of reduced pressure resistance caused by annealing and softening of the cover shell during welding, thereby improving the overall quality of the product.

[0009] According to one embodiment of the present invention, the screw rod is formed into a hollow columnar shape, and the lower end of the shaft is inserted into the screw rod so as to extend along the axial direction of the screw rod.

[0010] According to an embodiment of the present invention, the screw rod and the shaft are integrally formed into a screw rod shaft, the lower end of the screw rod is provided with a mounting groove with a lower end opening, and the upper end of the valve needle is arranged in the mounting groove.

[0011] According to one embodiment of the present invention, the upper end of the shaft passes through the mounting hole and is welded to the connecting plate.

[0012] According to one embodiment of the present invention, the stop assembly includes: a spring guide rail, which is arranged on the shaft; a slip ring, which is movably arranged on the spring guide rail along the axial direction of the spring guide rail, and one end of the spring guide rail extends outward in the radial direction of the screw shaft; a stop rod, the lower end of the stop rod is connected to the upper end of the cover, and the upper end of the stop rod is located on one side of the screw shaft and cooperates with the slip ring to limit the rotation range of the screw shaft.

[0013] According to one embodiment of the present invention, the cover is disposed on the outer periphery of the nut and connected to the upper end surface of the valve seat, and the lower end of the stop rod is connected to the cover.

[0014] According to one embodiment of the present invention, the upper end of the cover is provided with a positioning groove open toward the direction of the magnetic ring, and the stop rod comprises: a positioning portion, which corresponds to the shape of the positioning groove and is arranged in the positioning groove, and the outer peripheral surface of the positioning portion abuts against the inner wall surface of the positioning groove; a stop rod body, the stop rod body is formed into a sheet extending along the axial direction of the screw shaft, the lower end of the stop rod body is connected to the positioning portion, and the upper end of the stop rod body cooperates with the slip ring.

[0015] According to one embodiment of the present invention, the positioning portion is formed as a hollow annular member with an opening, the inner wall surface of the positioning groove abuts against the outer wall surface of the positioning portion so that the inner wall surface of the positioning groove presses the outer wall surface of the positioning portion, the nut passes through the hollow portion of the positioning portion, and the lower end of the stop rod body is connected to the inner wall surface of the hollow portion.

[0016] According to an embodiment of the present invention, the stop rod is formed by stamping and bending a stainless steel plate.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of an electric valve in the prior art;

[0020] Figure 2 is a schematic structural diagram of an electric valve according to an embodiment of the present invention;

[0021] Figure 3 is a partial structural schematic diagram of an electric valve according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the assembly between the valve seat, the cover and the nut of the electric valve according to an embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of a cover of an electric valve according to an embodiment of the present invention;

[0024] Figure 6 is a schematic structural diagram of a screw shaft of an electric valve according to an embodiment of the present invention;

[0025] Figure 7 is a schematic diagram of the assembly of a shaft and a screw rod of a screw rod shaft of an electric valve according to another embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the structure of the stop rod of the electric valve according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] Electric valve 100;

[0029] Valve seat 10; valve chamber 11;

[0030] Nut 20; channel 21;

[0031] Screw shaft 30; screw 31; shaft 32; mounting groove 33;

[0032] Valve needle 40;

[0033] Connecting plate 60; mounting hole 61; boss 62;

[0034] Magnetic ring 70;

[0035] Stop assembly 80; spring guide rail 81; slip ring 82; stop rod 83; positioning portion 84; stop rod body 85;

[0036] Chamber 91; cover 92; housing 93; positioning groove 94. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The electric valve 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] like Figures 2 to 8 As shown, the electric valve 100 according to the embodiment of the present invention includes: a valve body, a nut 20 , a cover 93 , a screw shaft 30 , a valve needle 40 , a rotor assembly and a stop assembly 80 .

[0042] Specifically, the valve body includes a valve seat 10 and a cover 92. The valve seat 10 is provided with a valve cavity 11 extending along its axial direction. The lower end of the valve cavity 11 is formed as a valve port. The nut 20 is formed into a columnar shape. The nut 20 is defined with a channel 21 extending along its axial direction. The lower end of the nut 20 is inserted into the valve cavity 11 and the channel 21 is connected to the valve cavity 11. The cover shell 93 is defined with a chamber 91 with an open lower end. The lower end of the cover shell 93 is connected to the cover 92. The screw shaft 30 includes a screw 31 and a shaft 32. The lower end of the shaft 32 is connected to the upper end of the screw 31. The screw 31 is formed into a columnar shape and is arranged in the channel 21 along the axial direction of the nut 20. The upper end of the valve needle 40 is connected to the lower end of the screw 31. The lower end of the valve needle 40 passes through the valve port. The valve needle 40 is movable along the axial direction of the valve cavity 11 to adjust the fluid flow through the valve port.

[0043] The rotor assembly is arranged in the chamber 91, and the rotor assembly is connected to the screw shaft 30 to drive the screw 31 to move axially along the valve chamber 11. The rotor assembly includes a connecting plate 60 and a magnetic ring 70. The connecting plate 60 is provided with a mounting hole 61 that passes through it along its thickness direction. The upper end of the shaft 32 passes through the mounting hole 61 and is fixedly connected to the connecting plate 60. The magnetic ring 70 is formed as a hollow column coaxial with the screw shaft 30 and is sleeved on the outer periphery of the screw shaft 30. The upper end of the magnetic ring 70 is fixedly connected to the connecting plate 60. At least a portion of the stop assembly 80 is connected to the valve seat 10, and at least another portion is connected to the screw shaft 30 to limit the range of motion of the screw shaft 30.

[0044] In other words, the electric valve 100 according to the embodiment of the present invention is mainly composed of a valve body, a nut 20, a cover 93, a screw shaft 30, a valve needle 40, a rotor assembly and a stop assembly 80. The valve body includes a valve seat 10 and a cover 92. The valve seat 10 is provided with a valve cavity 11 extending along its axial direction. A nut 20 formed in a columnar shape is inserted at the upper end of the valve cavity 11. The nut 20 defines a channel 21 that penetrates along its axial direction. The channel 21 is connected to the valve cavity 11. A screw shaft 30 formed in a columnar shape is inserted in the channel 21. The screw shaft 30 extends along the axial direction of the nut 20 and is movable. The screw shaft 30 includes a screw 31 and a shaft 32. The lower end of the shaft 32 is connected to the upper end of the screw 31. The screw 31 is formed in a columnar shape and is arranged in the channel 21 along the axial direction of the nut 20.

[0045] The cover 93 is fixed on the valve seat 10, the rotor assembly is installed in the chamber of the cover 93 and connected to the screw shaft 30, the coil is sleeved on the outside of the cover 93, and the rotor assembly can convert the rotation formed by the magnetic field generated by the coil into the axial movement of the screw shaft 30. A magnetic ring 70 is provided above the valve seat 10, and the magnetic ring 70 is formed as a hollow cylindrical member with permanent magnetism. The rotor assembly can be mainly composed of a magnetic ring 70 and a connecting plate 60. The upper end of the magnetic ring 70 is fixedly connected to the connecting plate 60. The connecting plate 60 is provided with a mounting hole 61 which passes through the connecting plate 60 along its thickness direction. A screw shaft 30 is installed in the hollow structure of the magnetic ring 70. The magnetic ring 70 is coaxial with the screw shaft 30. The upper end of the shaft 32 passes through the mounting hole 61 and is fixedly connected to the connecting plate 60. The lower end of the shaft 32 is connected to the upper end of the screw 31. The upper end of the valve needle 40 is connected to the lower end of the screw 31. The lower end of the valve needle 40 passes through the valve cavity 11. The valve needle 40 moves synchronously with the screw 31. The lower end of the valve needle 40 adjusts the flow rate of the fluid passing through the valve port by adjusting the matching distance with the valve port.

[0046] A stopper assembly 80 may be provided on the outside of the screw shaft 30, at least a portion of which is connected to the valve seat 10, and at least another portion of which is connected to the screw shaft 30, and the rotation range of the screw shaft 30 can be limited by the stopper assembly 80. A cover 93 is provided on the outer periphery of the magnetic ring 70, and a chamber 91 with an open lower end is defined in the cover 93. The lower end of the cover 93 is connected to the valve seat 10, and at least a portion of the magnetic ring 70, the connecting plate 60, the stopper assembly 80, the screw shaft 31, the shaft 32 and the nut 20 are respectively located in the chamber 91. Compared with the existing electric valve, the distance between the engagement portion of the stopper assembly 80 and the screw shaft 30 and the nut 20 is shortened. The rotor assembly can be mainly composed of a rotor, a screw shaft 30 and a stop assembly 80. When the stop assembly 80 is limited up and down, it can effectively prevent the contact blocking force inside the stop assembly 80 from being amplified by the lever effect, reduce the probability of the rotor assembly being eccentric, prevent the impact vibration caused by the rotor assembly being stopped at the moment of the limit, reduce the noise generated by the electric valve and the wear of the meshing part, and extend the service life of the valve. In addition, there is no need to make a through hole at the top end of the cover 93, which reduces the probability of refrigerant leakage and processing costs at the weld between the core shaft and the through hole on the cover 93, and prevents the decrease in the pressure resistance of the cover 93 due to the heat effect of welding and the annealing and softening operation of the metal around the weld. Among them, the valve seat 10 is provided with a refrigerant and other fluid inlet and outlet pipes.

[0047] Therefore, according to the electric valve 100 of the embodiment of the present invention, by connecting the lower end of the shaft 32 with the screw 31, and connecting the upper end of the screw shaft 30 with the connecting plate 60 of the rotor assembly, not only the distance between the lower end of the stop assembly and the meshing portion of the screw shaft 30 and the nut 20 is shortened, but also the eccentricity and vibration of the rotor caused by the stopping force are reduced, the noise during operation is reduced, and the service life is extended. At the same time, there is no need to open a hole at the top end of the cover 93 to install and fix the screw shaft 30, which reduces the probability of refrigerant leakage at the weld and the processing cost, and avoids the problem of reduced pressure resistance caused by annealing and softening of the cover 93 during welding, thereby improving the overall quality of the product.

[0048] It should be noted that the electric valve 100 according to the embodiment of the present invention breaks away from the traditional thinking of fixing the screw shaft 30 on the cover 93, and assembles the rotor assembly with the shaft 32 and the screw 31 together in a breakthrough manner. The assembly structure of the shaft 32 and the screw 31 can be adjusted according to the production process and specific requirements of the product.

[0049] like Figure 7As shown, in some specific embodiments of the present invention, the screw rod 31 is formed into a hollow column, the lower end of the screw rod 31 is provided with a mounting groove 33 with a lower end opening, and the lower end of the shaft 32 is inserted into the screw rod 31 along the axial direction of the screw rod 31. Specifically, the upper end of the valve needle 40 is arranged in the lower end mounting groove 33 of the screw rod 31, the upper end of the screw rod 31 is provided with an inner hole, and the lower end of the shaft 32 is connected with the inner hole provided at the upper end of the screw rod 31 by interference fit. In order to ensure reliable connection, in specific implementation, the screw rod 31 and the shaft 32 can be fixed by laser welding at the joint surface.

[0050] like Figure 6 As shown, in some other specific embodiments of the present invention, the screw rod 31 and the shaft 32 are integrally formed as a screw rod shaft 30, which is convenient for production and processing and improves assembly efficiency. The lower end of the screw rod 31 is provided with a mounting groove 33 with an opening at the lower end, and the upper end of the valve needle 40 is arranged in the mounting groove 33, that is, the connection between the screw rod 31, the shaft 32 and the valve needle 40 can be realized.

[0051] The shaft 32 and the rotor assembly can be assembled by welding with the connecting plate 60 of the rotor assembly. Optionally, according to one embodiment of the present invention, the connecting plate 60 is a metal part, which is embedded in the upper end of the magnetic ring 70. The upper end of the shaft 32 passes through the mounting hole 61 and is welded to the connecting plate 60. Specifically, laser welding or other welding methods can be used. The upper part of the shaft 32 can be a smooth round shaft with a small long groove at the end for installing the stop assembly 80.

[0052] In some specific embodiments of the present invention, a hollow boss 62 corresponding to the position of the mounting hole 61 is provided on the connecting plate 60, and the boss 62 extends out of the outer surface of the connecting plate 60, and the upper end of the shaft 32 passes through the hollow portion of the boss 62, which can effectively improve the contact area and the stability of the connecting structure. Optionally, the boss 62 is provided on the upper surface of the connecting plate 60, that is, the boss 62 is provided on the side of the connecting plate 60 that is away from the position of the stop assembly 80.

[0053] According to one embodiment of the present invention, the stopper assembly 80 includes: a spring guide rail 81, a slip ring 82 and a stopper rod 83, the spring guide rail 81 is arranged on the shaft 32, the slip ring 82 is movably arranged on the spring guide rail 81 along the axial direction of the spring guide rail 81, one end of the spring guide rail 81 extends radially outwardly along the screw shaft 30, the lower end of the stopper rod 83 is connected to the upper end of the cover 92, the upper end of the stopper rod 83 is located on one side of the screw shaft 30 and cooperates with the slip ring 82 to limit the rotation range of the screw shaft 30. After the spring guide rail 81 and the slip ring 82 are mounted on the outer circumferential surface of the smooth round shaft at the upper part of the shaft 32, the upper stopper of the spring guide rail 81 can be embedded in the small long groove and clamped by the fixing ring. Optionally, after the hollow inner cavity of the rotor magnetic ring 70 encloses the slip ring 82 and the spring guide rail 81, its mounting hole 61 fits with the shaft end of the shaft 32, and can be fixed by laser welding at the joint interface where the connecting plate 60 is exposed at the shaft end.

[0054] like Figure 2 and Figure 3 As shown, the cover 92 is arranged on the outer periphery of the nut 20 and is connected to the upper end surface of the valve seat 10, the lower end of the stop rod 83 is connected to the cover 92, and a chamber 91 with an open lower end is defined in the cover shell 93. The cover shell 93 is located above the cover 92 and the lower end is connected to the cover 92.

[0055] like Figure 2 , Figure 3 , Figure 5 and Figure 8 As shown, optionally, a positioning groove 94 open toward the direction of the magnetic ring 70 is provided at the upper end of the cover 92, and the stop rod 83 includes a positioning portion 84 and a stop rod body 85, the positioning portion 84 corresponds to the shape of the positioning groove 94 and is arranged in the positioning groove 94, the outer peripheral surface of the positioning portion 84 is stopped against the inner wall surface of the positioning groove 94, the stop rod body 85 is formed into a sheet extending along the axial direction of the screw shaft 30, the lower end of the stop rod body 85 is connected to the positioning portion 84, and the upper end of the stop rod body 85 cooperates with the slip ring 82.

[0056] Further, the positioning portion 84 is formed as a hollow annular member with an opening, the inner wall surface of the positioning groove 94 abuts against the outer wall surface of the positioning portion 84 so that the inner wall surface of the positioning groove 94 presses the outer wall surface of the positioning portion 84, the nut 20 passes through the hollow portion of the positioning portion 84, and the lower end of the stop rod body 85 is connected to the inner wall surface of the hollow portion. In other words, the positioning portion 84 can be formed into a C-shape, and when the C-shaped positioning portion 84 is riveted into the positioning groove 94, the positioning portion 84 will be tightened and exert a force on the inner wall surface of the positioning groove 94, thereby improving the connection stability.

[0057] The screw shaft 30 passes through the hollow part of the positioning part 84, and the lower end of the stop rod body 85 is connected to the inner wall surface of the hollow part. The positioning part 84 can cooperate with the stop rod body 85 to form a "T"-shaped member, and the stop rod body 85 can be perpendicular to the positioning part 84, and the positioning part 84 can be disc-shaped. Optionally, the stop rod 83 can be formed by stamping and bending a stainless steel plate.

[0058] In summary, the electric valve 100 according to the embodiment of the present invention adopts a device that combines a valve seat 10, a nut 20, a cover 93, a screw shaft 30, a valve needle 40, a rotor assembly and a stop assembly 80. The stop assembly 80 is arranged at the middle and lower part of the screw shaft 30, and the stop assembly 80 is close to the meshing position of the screw shaft 30 and the nut 20, thereby reducing the rotor eccentricity and vibration caused by the stopping force. Therefore, it has the characteristics of low noise and long service life during operation. Since there is no need to open a hole at the top end of the cover 93 to install a fixed core shaft, and the stop rod 83 is riveted and fixed to the cover 92, the possibility of refrigerant leakage is eliminated. The electric valve 100 has the advantages of good sealing and pressure resistance, low cost, reasonable structure, long service life, good performance, easy manufacturing, etc.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric valve, characterized in that: include: A valve body, the valve body comprising a valve seat and a cover, the valve seat being provided with a valve cavity extending along its axial direction, the lower end of the valve cavity being formed as a valve port; A nut, the nut is formed into a columnar shape, a passage is defined in the nut and passes through the nut along its axial direction, the lower end of the nut is inserted into the valve cavity and the passage is communicated with the valve cavity; A housing, wherein a chamber with an open lower end is defined in the housing, and the lower end of the housing is connected to the cover; A screw shaft, the screw shaft comprising a screw and a shaft, the lower end of the shaft being connected to the upper end of the screw, the screw being formed into a columnar shape and extending in the axial direction of the nut and arranged in the channel; A valve needle, the upper end of which is connected to the lower end of the screw rod, the lower end of which passes through the valve port, and the valve needle is movable along the axial direction of the valve cavity to adjust the flow of the fluid passing through the valve port; A rotor assembly, the rotor assembly is arranged in the chamber, the rotor assembly is connected to the screw shaft to drive the screw to move along the axial direction of the valve chamber, and the rotor assembly includes: A connecting plate, wherein the connecting plate is provided with a mounting hole extending through the connecting plate in a thickness direction thereof, and the upper end of the shaft passes through the mounting hole and is fixedly connected to the connecting plate; A magnetic ring, wherein the magnetic ring is in a hollow column shape coaxial with the screw shaft and sleeved on the outer circumference of the screw shaft, and the upper end of the magnetic ring is fixedly connected to the connecting plate; a stop assembly, wherein at least a part of the stop assembly is connected to the valve seat, and at least another part is connected to the screw shaft to limit the range of motion of the screw shaft; The stop assembly comprises: a spring guide rail, the spring guide rail being arranged on the shaft; A slip ring, wherein the slip ring is movably disposed on the spring guide rail along the axial direction of the spring guide rail, and one end of the spring guide rail extends outwardly along the radial direction of the screw shaft; A stop rod, the lower end of which is connected to the upper end of the cover, the upper end of which is located on one side of the screw shaft and cooperates with the slip ring to limit the rotation range of the screw shaft; The cover is arranged on the outer periphery of the nut and connected to the upper end surface of the valve seat, and the lower end of the stop rod is connected to the cover; The upper end of the cover is provided with a positioning groove which is open toward the direction where the magnetic ring is located, and the stop rod comprises: A positioning portion, the positioning portion corresponds to the shape of the positioning groove and is disposed in the positioning groove, and the outer peripheral surface of the positioning portion abuts against the inner wall surface of the positioning groove; A stop rod body, wherein the stop rod body is formed into a sheet extending along the axial direction of the screw shaft, the lower end of the stop rod body is connected to the positioning portion, and the upper end of the stop rod body is matched with the slip ring; The positioning portion is formed as a hollow annular member with an opening, the inner wall surface of the positioning groove abuts against the outer wall surface of the positioning portion so that the inner wall surface of the positioning groove presses the outer wall surface of the positioning portion, the nut passes through the hollow portion of the positioning portion, and the lower end of the stop rod body is connected to the inner wall surface of the hollow portion; The screw rod and the shaft are integrally formed into a screw rod shaft, the lower end of the screw rod is provided with a mounting groove with a lower end opening, and the upper end of the valve needle is arranged in the mounting groove; The upper end of the shaft passes through the mounting hole and is welded to the connecting plate.

2. The electric valve according to claim 1, characterized in that: The screw rod is formed into a hollow column shape, and the lower end of the shaft is inserted into the screw rod so as to extend along the axial direction of the screw rod.

3. The electric valve according to claim 1, characterized in that: The stop rod is formed by stamping and bending a stainless steel plate.

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