An electrically operated valve

Abstract

An electric valve comprises a valve seat assembly and a nut assembly, the valve seat assembly comprises a first valve seat part and a second valve seat part, the first valve seat part comprises an outer wall part, a top wall part and an inner wall part, the top wall part is annular structure, the outer wall part extends downward along the outer periphery of the top wall part, the inner wall part extends downward along the inner periphery of the top wall part, the outer wall part is fixedly connected with the second valve seat part; the nut assembly comprises a nut body part and a nut connecting part, the nut body part comprises an outer edge section, the outer edge section is provided in the inner wall part, the outer edge section is guidedly matched with the matching hole part, the lower surface of the nut connecting part is matched with the upper surface of the top wall part, the valve seat assembly and the nut assembly are fixedly connected, and the coaxiality of the valve seat assembly and the nut assembly is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration control, in particular to an electric valve. BACKGROUND

[0002] In air conditioners, refrigerators, heat pump water heaters and various refrigeration and heating equipment, an electric valve is usually used to regulate the flow of fluid.

[0003] The electric valve usually comprises a valve seat assembly, a nut assembly and a valve needle screw rod assembly, the valve seat assembly is fixedly connected with the nut assembly, the valve needle screw rod assembly is threadedly connected with the nut assembly, when the valve needle screw rod assembly rotates, the valve needle moves along the axial direction, thereby approaching or moving away from the valve port.

[0004] If the coaxiality of the valve core seat and the nut is poor, the valve port may not be tightly sealed or the valve port may be eccentrically worn, thereby reducing the reliability of the electric valve and shortening the service life of the electric valve. SUMMARY

[0005] The electric valve comprises a valve seat assembly and a nut assembly, the valve seat assembly comprises a first valve seat part and a second valve seat part, the first valve seat part comprises an outer wall part, a top wall part and an inner wall part, the top wall part has a ring structure, the outer wall part extends downward along the outer periphery of the top wall part, the inner wall part extends downward along the inner periphery of the top wall part, the outer wall part is fixedly connected with the second valve seat part;

[0006] The nut assembly comprises a nut body part and a nut connecting part, the nut body part comprises an outer edge segment, the outer edge segment is arranged in the inner wall part, the outer edge segment is guidedly matched with the matching hole part, the lower surface of the nut connecting part is matched with the upper surface of the top wall part, and the valve seat assembly and the nut assembly are fixedly connected.

[0007] The electric valve provided by the present application has the advantages that the outer edge segment is arranged in the inner wall part, the outer edge segment is guidedly matched with the inner wall part, and the coaxiality of the valve seat assembly and the nut assembly is good. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a sectional view of the electric valve of the present application;

[0009] Figure 2 is a structural schematic view of the valve seat part of the electric valve of the present application;

[0010] Figure 3 is a structural schematic view of the valve core rotor part of the electric valve of the present application, and a partially enlarged sectional view thereof;

[0011] Figure 4is a valve body sectional view of the valve core rotor component of the electric valve of the present application at the critical point of over-opening;

[0012] Figure 5 is a valve body sectional view of the valve core rotor component of the electric valve of the present application at the point of over-opening thread pair disengagement;

[0013] wherein, Figures 1-5 includes the following reference signs:

[0014] 10 valve seat assembly; 101 first valve seat component; 1011 outer wall part; 10111 outer wall connecting part; 10112 step part; 101121 step horizontal part; 101122 step vertical part; 1012 top wall part; 1013 inner wall part; 10131 fitting hole part; 1014 balance hole part; 102 second valve seat component; 1021 insertion part; 1022 limiting part; 1023 fitting connecting part; 103 first connecting pipe part; 104 second connecting pipe part; 10a valve port part; 10b valve cavity; 10d first in-out passage; 10e second in-out passage; 20 valve core rotor assembly; 201 valve shaft assembly; 2011 valve shaft; 2012 bushing; 20121 bushing hole part; 20122 bushing extension part; 2013 valve shaft main body part; 2014 cylindrical part; 20141 cylindrical part abutting part; 201411 cylindrical part through hole part; 2015 valve shaft; 20151 first valve shaft inner wall part; 20152 valve shaft abutting part; 20153 second valve shaft inner wall part; 2016 outer edge part; 20161 first outer edge part; 20162 second outer edge part; 201a outer thread part; 201b movable stop part; 201c rotor fixing part; 202 valve core; 2021 valve core main body part; 2022 valve core sleeve; 20221 valve core sleeve hole part; 202a valve core head part; 202b valve core abutting part; 203 rotor; 204 elastic member; 205 jacking rod; 2051 jacking rod main body part; 2052 jacking rod abutting part; 206 washer; 2061 washer hole part; 207 gasket; 209 upper washer; 2091 upper washer hole part; 20b abutting part; 20c passage part; 20d bearing part; 30 housing; 40 nut assembly; 401 nut body part; outer edge section 4011; 402 nut connecting part; 40a fixed stop part; 40b inner thread part; 50 coil.

DETAILED DESCRIPTION

[0015] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0016] Please refer to Figures 1 to 5 wherein, Figure 1 is a sectional view of the electric valve of the present application; Figure 2 is a structural schematic view of the valve seat assembly 10 of the electric valve of the present application; Figure 3is a structural schematic view of the valve core rotor assembly of the electric valve of the present application, and a local enlarged sectional view thereof; Figure 4 is a sectional view of the valve body when the valve core rotor assembly of the electric valve of the present application is about to reach the critical point of over-opening; Figure 5 is a sectional view of the valve body when the threaded pair of the valve core rotor assembly of the electric valve of the present application is disengaged;

[0017] Please refer to Figure 1 , Figure 2 In one embodiment, the electric valve provided by the present application comprises a valve body and a coil 50, and the coil 50 is sleeved on the valve body. The valve body comprises a valve seat assembly 10, a valve core rotor assembly 20, a shell 30, and a nut assembly 40. The stator coil 50 of the electric valve is connected to a driving controller. After the driving controller is powered on, the coil 50 is sent a pulse driving signal, and the coil 50 generates a changing magnetic field, thereby driving the valve core rotor assembly 20 of the electric valve to rotate in a clockwise direction or a counterclockwise direction. The valve core rotor assembly 20 comprises a valve shaft assembly 201. In this embodiment, the valve shaft assembly 201 comprises a valve shaft 2011, the valve shaft 2011 is provided with an external threaded part 201a, the nut assembly 40 comprises a nut body part 401, the inner hole part of the nut body part 401 is provided with an internal threaded part 40b, the valve shaft 2011 is threadedly connected with the nut body part 401 (hereinafter referred to as screwing), and the valve shaft 2011 will displace along the axial direction during the rotational movement of the valve core rotor assembly 20, thereby driving the valve core 202 to approach or move away from the valve port part 10a.

[0018] In this embodiment, the valve seat assembly 10 comprises a first valve seat part 101 and a second valve seat part 102. The first valve seat part 101 comprises an outer wall part 1011, a top wall part 1012, and an inner wall part 1013. The top wall part 1012 is substantially annular (i.e., hollow inside). The outer wall part 1011 is substantially formed by extending downward along the outer periphery of the top wall part 1012. The inner wall part 1013 is substantially formed by extending downward along the inner periphery of the top wall part 1012. The outer wall part 1011 and the inner wall part 1013 are substantially hollow cylindrical. The second valve seat part 102 is located at the lower end of the first valve seat part 101. In this embodiment, the top wall part 1012, the outer wall part 1011, and the inner wall part 1013 are integrally formed, which can be made by processes such as sheet stretching or bar forging. The lower end opening side of the outer wall part 1011 is fixedly connected with the second valve seat part 102.

[0019] Please refer to Figure 2In the present embodiment, the second valve seat component 102 includes an insertion portion 1021 and a limiting portion 1022, the insertion portion 1021 is substantially vertical, the limiting portion 1022 is substantially horizontal, and the limiting portion 1022 is located on the circumferential outer side of the insertion portion 1021. When the first valve seat component 101 and the second valve seat component 102 are assembled and fixed, the insertion portion 1021 can be first assembled from the opening side of the first valve seat component 101, so that the insertion portion 1021 cooperates with the inner surface of the outer wall portion 1011. During the assembly of the insertion portion 1021 into the outer wall portion 1011, the outer wall portion 1011 can provide a certain guide for the insertion portion 1021, so as to ensure the coaxiality of the axis of the first valve seat component 101 and the axis of the second valve seat component 102. In addition, the outer wall portion 1011 along the normal projection of the plane in which the cross section of the electric valve is located overlaps with the normal projection of the limiting portion 1022 along the plane. When the insertion portion 1021 is assembled into the outer wall portion 1011 to a certain extent, the limiting portion 1022 can abut against the opening end of the outer wall portion 1011 to limit the insertion portion 1021 from continuing to be assembled into the outer wall portion 1011, so as to limit the relative position of the first valve seat component 101 and the second valve seat component 102 in the axial direction, and then the first valve seat component 101 and the second valve seat component 102 are fixedly connected by, for example, welding.

[0020] In addition, in the present embodiment, the second valve seat component 102 has a valve port 10a, the valve seat assembly 10 further includes a first inlet and outlet passage 10d and a second inlet and outlet passage 10e, the valve port 10a can communicate with the first inlet and outlet passage 10d and the second inlet and outlet passage 10e to allow the fluid medium (for example, refrigerant) to pass through, the outer wall portion 1011 is provided with an outer wall connecting portion 10111, the first connecting pipe portion 103 is fixedly connected with the outer wall connecting portion 10111 by welding or the like, the second valve seat component 102 is provided with a matching connecting portion 1023, the matching connecting portion 1023 is fixedly connected with the second connecting pipe portion 104, and the second connecting pipe portion 104 communicates with the valve port 10a (not considering the valve core 202), the first connecting pipe portion 103 and the second connecting pipe portion 104 serve as the inflow or outflow passage of the fluid medium of the electric valve, and are generally used for connecting with the system pipeline when the electric valve is installed in the refrigeration and heating system of the air conditioner or the like.

[0021] Through the above arrangement, the valve seat assembly 10 is formed with a valve cavity 10b. Compared with the valve seat machined by a bar material in the background art, the volume of the valve cavity 10b can be relatively easily increased, so as to improve the pressure stability of the fluid, thereby reducing the noise of the fluid.

[0022] Please refer to Figure 2 , in combination with Figure 1The outer edge section 4011 of the nut body part 401 can be inserted into the inner wall part 1013 when the nut assembly 40 is assembled with the valve seat assembly 10, at this time, the nut assembly 40 is arranged in the inner wall part 1013, the inner wall part 1013 and the outer edge section 4011 are guided and matched, the nut assembly 40 can be guided by the inner wall part 1013 when being arranged in the valve seat assembly 10, the coaxiality of the axis of the nut assembly 40 and the axis of the valve seat assembly 10 is better, when the valve core 202 approaches or is away from the valve port 10a, the deflection degree of the valve core 202 relative to the axis of the electric valve is relatively small, and the eccentric wear of the valve core 22 can be reduced.

[0023] The nut body part 401 and the inner wall part 1013 can be in interference fit, transition fit or clearance fit, in the embodiment, the nut body part 401 and the inner wall part 1013 are in interference fit, when the nut body part 401 and the matching hole part 10131 are in clearance fit, the single-side clearance between the outer edge section 4011 of the nut body part 401 and the inner wall part 1013 is preferably controlled within 0.15 mm.

[0024] Continuing to refer to Figure 1 In the embodiment, the nut assembly 40 further comprises a nut connecting part 402, the nut connecting part 402 is made of metal material, the nut connecting part 402 is integrally formed with the nut body part 401 as an insert by injection molding, the lower surface of the nut connecting part 402 is matched with the upper surface of the top wall part 1012, that is, the nut connecting part 402 is overlapped on the top wall part 1012, and then the valve seat assembly 10 and the nut assembly 40 are fixedly connected by welding or glue bonding.

[0025] Specifically, in the plane of the cross section of the electric valve, the orthographic projection of the nut connecting part 402 along the plane and the orthographic projection of the top wall part 1012 along the plane have an overlapping area, so that when the nut body part 401 is arranged in the inner wall part 1013 to a certain extent, the nut connecting part 402 can abut against the top wall part 1012, thereby limiting the nut body part 401 from being further arranged in the matching hole part 10131, the relative position of the nut assembly 40 and the valve seat assembly 10 in the axial direction can be limited, and then the nut assembly 40 and the valve seat assembly 10 are assembled by fixing the nut connecting part 402 and the top wall part 1012.

[0026] In the embodiment, the lower surface of the nut connecting portion 402 is planar, and the upper surface of the top wall portion 1012 is also planar, so that when the nut assembly 40 is assembled and fixed with the valve seat assembly 10, the lower surface of the nut connecting portion 402 is fixedly connected with the upper surface of the top wall portion 1012 after cooperation, the axis of the nut assembly 40 has good perpendicularity with the horizontal direction, and the nut assembly 40 is not easy to be inclined relative to the axial direction of the valve seat assembly 10. At the same time, when the nut body portion 401 is fitted into the inner wall portion 1013 at the outer edge section 4011 thereof, the inner wall portion 1013 also plays a role in improving the perpendicularity of the axis of the nut assembly 40 with the horizontal direction, so that the coaxiality of the axis of the nut assembly 40 with the axis of the valve seat assembly 10 is good in the embodiment.

[0027] In the embodiment, the lower end of the inner wall portion 1013 is lower than the highest position of the first connecting pipe portion 103, so that the impact of fluid on the valve core 202 when the fluid flows from the first connecting pipe portion 103 into the valve cavity 10b can be reduced, the inclination of the valve core 202 relative to the axis of the valve port portion 10a can be reduced, and the service life of the electric valve can be improved.

[0028] Please refer to Figure 2 , in combination Figure 1 The electric valve of the application further comprises a shell 30. In the embodiment, the shell 30 is a thin-walled member in the form of a cover, and the lower end opening side of the shell 30 is hermetically welded with the valve seat assembly 10, thereby forming a containing chamber capable of containing the upper half of the nut body portion 401 and the main body portion of the valve core rotor assembly 20. Specifically, in the embodiment, the first valve seat component 101 further comprises a step portion 10112 located on the circumferential outer side of the outer wall portion 1011. The step portion 10112 is in the form of an annular step, and comprises a step horizontal portion 101121 and a step vertical portion 101122. The step horizontal portion 101121 is a portion of the step portion 10112 that is relatively more horizontal, and the step vertical portion 101122 is a portion of the step portion 10112 that is relatively more vertical. In the embodiment, the step horizontal portion 101121 is horizontal, and the step vertical portion 101122 is vertical.

[0029] When the valve seat assembly 10 and the shell 30 are assembled, the shell 30 is gradually sleeved along the step longitudinal part 101122, and the step longitudinal part 101122 can guide the shell 30 in the process of gradually sleeving along the step longitudinal part 101122, so that the axis of the shell 30 is not easy to be deviated relative to the axis of the valve seat assembly 10, and the coaxiality of the axis of the valve seat assembly 10 and the axis of the shell 30 is good. In addition, the orthogonal projection of the shell 30 along the plane in which the cross section of the electric valve is located overlaps with the orthogonal projection of the step horizontal part 101121 along the plane, so that when the open end of the shell 30 is gradually sleeved along the step longitudinal part 101122 to a certain extent, the open end of the shell 30 can abut against the step horizontal part 101121 to limit the shell 30 from being further sleeved, so that the relative position of the shell 30 and the valve seat assembly 10 in the axial direction can be limited. In the embodiment, the step horizontal part 101121 is horizontally arranged, and the lower end opening side of the shell 30 is also horizontally arranged, so that the shell 30 is not easy to be deviated relative to the valve seat assembly 10, thereby facilitating the guarantee of the coaxiality of the axis of the shell 30 and the axis of the valve seat assembly 10.

[0030] In this way, the electric valve is formed with two chambers, i.e., a containing chamber above the nut connecting part 402 and a valve chamber 10b below the nut connecting part 402.

[0031] In the embodiment, the valve seat assembly 10 further comprises a balance hole part 1014 penetrating through the upper and lower surfaces of the top wall part 1012.

[0032] Through the above arrangement, the pressure of the containing chamber and the pressure of the valve chamber 10b can be balanced faster through the balance hole part 1014, and the noise caused by the imbalance of the pressure of the containing chamber and the pressure of the valve chamber 10b or the slow balance time can be reduced.

[0033] It is worth noting that the balance hole part 1014 of the present application is a way to balance the pressure of the containing chamber and the pressure of the valve chamber 10b, and the balance hole part 1014 is not limited to be the only balance channel, but can also be one of the balance channels in the electric valve.

[0034] See Figure 3 The valve core rotor assembly 20 comprises a rotor 203 and a valve core 202, the rotor 203 is provided with magnetic poles in the circumferential direction, the valve core 202 is inserted into the center through hole of the valve shaft 2011, in addition, the valve core rotor assembly 20 further comprises an elastic member 204 arranged in the center through hole of the valve shaft 2011, and a top rod 205 arranged at the upper end of the elastic member 204, and the valve shaft assembly 201 further comprises a bushing 2012 fixedly connected to the upper end of the valve shaft 2011, and in the embodiment, the elastic member 204 is a spring.

[0035] See Figure 1 , Figure 3 The nut body 401 protrudes from the annular base and is provided with a fixed stop 40a, which can cooperate with the movable stop 201b provided on the valve core rotor assembly 20 to form a stop mechanism at the lower end of the stroke of the electric valve. That is, when the valve core rotor assembly 20 moves downward relative to the valve seat assembly 10 to a certain extent, the movable stop 201b can abut against the fixed stop 40a to limit the further rotation of the valve core rotor assembly 20 relative to the valve seat assembly 10, thereby limiting the valve core rotor assembly 20 from continuing to move downward in the axial direction, thereby controlling the downward stroke of the valve core rotor assembly 20.

[0036] When the coil 40 of the electric valve receives a drive pulse signal and generates a changing magnetic field, the rotor 203 in the valve body is energized and rotates. In this embodiment, the valve shaft 2011 is fixedly connected to the rotor 203, so the valve shaft 2011 will rotate synchronously with the rotor 203. The spiral feed mechanism of the valve shaft 2011 and the nut body 401 can convert the rotational motion of the rotor 203 into axial movement, thereby driving the valve core 202 to bring its valve core head 202a closer to or away from the valve port 10a, thereby realizing the linear switching regulation function of the electric valve flow.

[0037] The valve core rotor assembly 20 of this electric valve includes a rotor 203 with magnetic poles in the circumferential direction, a valve shaft 2011 fixedly connected to the rotor 203, a valve core 202 inserted into the central through hole of the valve shaft 2011, an elastic element 204 disposed in the inner cavity of the valve shaft 2011, a push rod 205 disposed at the upper end of the elastic element 204, and a bushing 2012 fixedly connected to the upper end of the valve shaft 2011.

[0038] The electric valve of this application has the elastic element 204 set in the inner cavity of the valve shaft 2011. The valve shaft 2011 constrains it in both the circumferential and vertical directions, so the elastic element 204 will not move up and down, thus it will not generate much noise from movement, and it can also avoid the risk of failure of the elastic element 204 falling off and shifting.

[0039] See Figure 3In the present embodiment, the valve shaft 2011 includes a hole extending upward and downward, and an inner wall of the hole forms the valve shaft inner wall portion 2015. In the axial direction of the valve shaft 2011, the inner diameter of the valve shaft inner wall portion 2015 is not constant. Specifically, the valve shaft inner wall portion 2015 includes a first valve shaft inner wall portion 20151, a valve shaft abutting portion 20152, and a second valve shaft inner wall portion 20153. The first valve shaft inner wall portion 20151 is located above the second valve shaft inner wall portion 20153. In the plane of the cross section of the valve shaft 2011, the orthogonal projection of the first valve shaft inner wall portion 20151 on the plane is located outside the orthogonal projection of the second valve shaft inner wall portion 20153 on the plane. Generally, for the convenience of manufacturing, the cross sections of the first valve shaft inner wall portion 20151 and the second valve shaft inner wall portion 20153 are circular. In this case, the diameter of the first valve shaft inner wall portion 20151 is greater than the diameter of the second valve shaft inner wall portion 20153. In the present embodiment, the first valve shaft inner wall portion 20151 and the second valve shaft inner wall portion 20153 are constant in height, and the orthogonal projections of the first valve shaft inner wall portion 20151 and the second valve shaft inner wall portion 20153 on the plane of the cross section of the valve shaft 2011 are circular.

[0040] In addition, the valve shaft abutting portion 20152 has an extension distance in the horizontal direction. The outer edge of the valve shaft abutting portion 20152 intersects with the first valve shaft inner wall portion 20151, and the inner edge of the valve shaft abutting portion 20152 intersects with the second valve shaft inner wall portion 20153. When the cross sections of the first valve shaft inner wall portion 20151 and the second valve shaft inner wall portion 20153 are circular, the orthogonal projection of the valve shaft abutting portion 20152 on the plane of the cross section of the valve shaft 2011 is a circular ring. In the present embodiment, the valve shaft abutting portion 20152 is horizontal. However, the valve shaft abutting portion 20152 can also be arranged in a form that is not completely planar. For example, the valve shaft abutting portion 20152 can gradually extend upward or downward in a direction away from the center of the valve shaft 2011. It can be understood that the valve shaft abutting portion 20152 only needs to have an extension distance in the horizontal direction.

[0041] See Figure 3In the present embodiment, the valve shaft 2011 comprises an outer edge portion 2016, which comprises a first outer edge portion 20161 and a second outer edge portion 20162, the first outer edge portion 20161 is located above the second outer edge portion 20162, in the plane of the cross section of the valve shaft 2011, the orthographic projection of the first outer edge portion 20161 along the plane is outside the orthographic projection of the second outer edge portion 20162 along the plane, for the convenience of machining, the cross sections of the first outer edge portion 20161 and the second outer edge portion 20162 are both set as circular, the part of the valve shaft 2011 where the first outer edge portion 20161 is located is provided with a rotor fixing portion 201c, the rotor 203 and the rotor fixing portion 201c can be fixed by direct or indirect welding, riveting, magnetic plastic material injection connection, glue bonding and the like, in the present embodiment, the connecting piece is injection connected with the magnetic plastic material as an insert, and then the valve shaft 2011 is fixedly connected with the connecting piece by welding, when the rotor 203 and the valve shaft 2011 are directly connected, the valve shaft 2011 can also be injection connected with the magnetic plastic material as an insert.

[0042] The position of the valve shaft 2011 where the second outer edge portion 20162 is located is provided with an external thread portion 201a, which is combined with an internal thread portion 40b provided at the inner hole portion of the nut body portion 401 to form a screw feed mechanism (thread pair) of the electric valve.

[0043] In the present embodiment, the valve shaft assembly 201 further comprises a bushing 2012, which is located in the first valve shaft inner wall portion 20151, and the bushing 2012 is fixedly connected with the valve shaft 2011 by press fitting or welding and the like, the bushing 2012 further comprises a bushing hole portion 20121, which penetrates the upper and lower surfaces of the bushing 2012.

[0044] Continuing to refer to Figure 3In the present embodiment, the valve core 202 is arranged in the valve shaft 2011 (part of the valve core 202 is located in the inner wall part 2015 of the valve shaft), and the valve core 202 is in the shape of a stepped shaft, which includes a valve core head part 202a located at the approximate lower end of the valve core 202, the tip shape of the valve core head part 202a is related to the flow regulation curve required by the electric valve, and the valve core 202 also includes a valve core abutting part 202b located at the approximate upper end of the valve core 202. In the plane of the cross section of the valve core 202, the orthographic projection of the valve core head part 202a along the plane is located within the orthographic projection of the valve core abutting part 202b along the plane. In the present embodiment, the cross sections of the valve core head part 202a and the valve core abutting part 202b are both circular, so the diameter of the valve core abutting part 202b is greater than the diameter of the valve core head part 202a. In the present embodiment, the valve core 202 is inserted into the inner cavity of the valve shaft 2011 from top to bottom, the valve core abutting part 202b of the valve core 202 can abut against the valve shaft abutting part 20152, and the valve core head part 202a of the valve core 202 protrudes out from the second valve shaft inner wall part 20153. In the plane of the cross section of the valve core 202, the orthographic projection of the valve core abutting part 202b along the plane overlaps with the orthographic projection of the valve shaft abutting part 20152 along the plane, so the valve core abutting part 202b can abut against the valve shaft abutting part 20152 (of course, when a gasket or other component is arranged between the valve shaft abutting part 20152 and the valve core abutting part 202b so that they do not directly abut against each other, the projection relationship between the valve core abutting part 202b and the valve shaft abutting part 20152 can also not satisfy the above relationship). In the present embodiment, the cross sections of the outer edge of the valve core abutting part 202b, the first valve shaft inner wall part 20151, and the second valve shaft inner wall part 20153 are all circular, and the diameter of the valve core abutting part 202b is slightly smaller than the diameter of the first valve shaft inner wall part 20151, the diameter of the valve core abutting part 202b is greater than the diameter of the second valve shaft inner wall part 20153, and the maximum diameter of the valve core head part 202a is slightly smaller than the diameter of the second valve shaft inner wall part 20153, so the valve core 202 can be supported on the valve shaft abutting part 20152 of the valve shaft 2011.

[0045] In addition, the valve core rotor assembly 20 of the electric valve of the present embodiment also includes an elastic member 204, which can be designed as a cylindrical helical spring, and the elastic member 204 is located in the first valve shaft inner wall part 20151.

[0046] Continuing to refer to Figure 3The valve core rotor assembly 20 of the electric valve provided by the present application further comprises a top rod 205, the top rod 205 comprises a top rod main body part 2051 and a top rod abutting part 2052, in the embodiment, the top rod abutting part 2052 is formed in a structure extending in the circumferential direction of the top rod main body part 2051, the top rod abutting part 2052 is located below the bushing 2012, the top rod main body part 2051 passes through the bushing hole part 20121 to the outside of the valve shaft assembly 201, the lower end of the elastic member 204 abuts against the valve core 202, and the upper end of the elastic member 204 abuts against the top rod abutting part 2052 of the top rod 205.

[0047] Continuing to refer to Figure 3 In the plane where the cross section of the valve core rotor assembly 20 is located, the top rod abutting part 2052 and the bushing hole part 20121 have an overlapping area in the orthographic projection along the plane, the orthographic projection of the top rod main body part 2051 along the plane is located in the orthographic projection of the bushing hole part 20121 along the plane, thus the top rod abutting part 2052 cannot pass through the bushing hole part 20121 from bottom to top, and the top rod main body part 2051 can pass through the bushing hole part 20121 (of course, when a gasket or other component is arranged between the bushing 2012 and the top rod abutting part 2052 so that they do not directly abut against each other, the projection relationship between the bushing hole part 20121 and the top rod abutting part 2052 can also not satisfy the above relationship), in the embodiment, the outer edge of the top rod main body part 2051, the outer edge of the top rod abutting part 2052 and the cross section of the bushing hole part 20121 are all circular, the diameter of the top rod abutting part 2052 is greater than the diameter of the bushing hole part 20121, and the diameter of the top rod main body part 2051 is smaller than the diameter of the bushing hole part 20121. The upper end of the top rod main body part 2051 passes through the upper part of the bushing hole part 20121, the top rod abutting part 2052 is subjected to the elastic compression force of the elastic member 204 in the upward direction, and the top rod abutting part 2052 abuts against the bushing 2012 (including directly abutting against or indirectly abutting against, for example, when a gasket or other component is arranged between the bushing 2012 and the top rod abutting part 2052, the top rod abutting part 2052 indirectly abuts against the bushing 2012). After the bushing 2012 is fixedly connected to the valve shaft 2011, the elastic member 204 is in a compressed state.

[0048] The valve shaft assembly 201 provided by the present application comprises an abutting part 20b, the abutting part 20b abuts against the top rod abutting part 2052, in the embodiment, the bushing 2012 abuts against the top rod abutting part 2052, thus the bushing 2012 comprises the abutting part 20b.

[0049] See Figure 4 It is a valve body cross-sectional view when the valve core rotor part 20 of the electric valve provided by the present application is about to pass through the critical point of excessive opening. Figure 4The valve core rotor assembly 20 in the figure is in a state of being about to be over-opened (over-opening: refers to a state in which the valve core rotor assembly 20 is opened upwardly to a position exceeding the upper limit of the specified stroke). Figure 4 The valve core head 202a in the figure has been moved away from the valve port 10a, and at this time, the outer threaded part 201a of the valve shaft 2011 is still in a screwed state with the inner threaded part 40b of the nut body part 401, and the length L of the outer threaded part 201a is just in contact with the top of the outer shell 30.

[0050] See Figure 5 The figure is a cross-sectional view of the valve body when the valve core rotor assembly of the electric valve is over-opened (the threaded pair is unscrewed). Figure 5 The valve core rotor assembly 20 in the figure is in a state of being about to be over-opened (over-opening: refers to a state in which the valve core rotor assembly 20 is opened upwardly to a position exceeding the upper limit of the specified stroke). Figure 4 The position shown in the figure continues to move upwardly by a stroke height L, and at this time, the movable threaded part 201a of the valve shaft 2011 is just unscrewed from the fixed threaded part 10b of the nut body part 401, and the elastic member 204 is just in contact with the inner wall of the outer shell 30. Figure 4 The state in the figure is further compressed by a compression amount L, and the top end of the top rod main body part 2051 of the top rod 205 is in contact with the inner wall of the outer shell 30, and the downward elastic force of the elastic member 204 is finally transmitted to the valve shaft assembly 201, that is, the valve shaft assembly 201 is subjected to the downward elastic force load of the elastic member 204. If the valve core rotor assembly 20 continues to rotate in the over-opening direction, at this time, because the threaded pair has been unscrewed, the valve core rotor assembly 20 will not continue to move upwardly relative to the nut body part 401; when the valve core rotor assembly 20 is driven by the coil 40 to rotate downwardly in the valve closing direction, because the valve shaft 2011 is subjected to the elastic member compression force of the elastic member 204, the outer threaded part 201a and the inner threaded part 40b will be repositioned and screwed, and the valve core rotor assembly 20 will be rotated and moved downwardly.

[0051] The valve shaft assembly 201 provided in the present application comprises a passage part 20c, and the electric valve provided in the embodiment comprises a bearing part 20d, the passage part 20c can be used for the top rod main body part 2051 of the top rod 205 to pass out of the valve shaft assembly 201 to the top of the valve shaft assembly 201, so that the top rod main body part 2051 can be in contact with the bearing part 20d, and in the embodiment, the top rod main body part 2051 can pass out of the bushing hole part 20121 and be in contact with the outer shell 30, so in the embodiment, the bushing hole part 20121 comprises the passage part 20c, and the outer shell 30 comprises the bearing part 20d.

[0052] Some parts of the electric valve are changed in a conventional manner, such as separation and integration, but the functions of the geometrically corresponding parts after assembly are basically the same, and it still belongs to the concept of the present application.

[0053] In the present embodiment, the top rod 205 can be in contact with the housing 30, and the housing 30 includes a bearing portion 20d. Alternatively, the housing 30 can be welded with a housing connector, and the top rod 205 can be in contact with the housing connector. In this case, the bearing portion 20d is in contact with the top rod 205. That is, the bearing portion 20d of the present application is in contact with the top rod 205, and is not limited to the housing 30.

[0054] Based on the above embodiments, the core structure of the present application is used, and some adaptive changes are made in the addition of wear-reducing washers or gaskets, which should fall within the scope of the patent claims of the present application.

[0055] In the present embodiment, the electric valve is exemplified as a type capable of completely closing the flow. It should be noted that those skilled in the art can understand that the electric valve can also be a type incapable of completely closing the flow (i.e., the valve core 202 is not in contact with the valve port 10a when the valve core 202 is located at the position closest to the valve port in the movement).

[0056] In addition, based on the above embodiments, the valve core 202, the valve shaft assembly 201, and other components are assembled in a split type or are mechanically divided at different positions, and the functions of the geometrically corresponding parts are not substantially changed. These adaptive changes and combinations should also fall within the scope of the patent claims of the present application.

[0057] It should be noted that the terms such as "upper", "lower", "left", "right", and the like mentioned in the present embodiment are based on the drawings of the specification and are introduced for convenience of description. In addition, the ordinal numbers such as "first" and "second" in the component names are also introduced for convenience of description, and do not mean any limitation on the order of the components.

[0058] The electric valve provided by the present application has been described in detail above. The principles and embodiments of the present application are described by applying specific examples in the present text, and the above embodiments are only used to help understand the core idea of the present application. It should be noted that those skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the scope of the patent claims of the present application.

Claims

1. An electrically operated valve characterised in that, The valve seat assembly (10) comprises a first valve seat part (101) and a second valve seat part (102), the first valve seat part (101) comprises an outer wall part (1011), a top wall part (1012) and an inner wall part (1013), the top wall part (1012) is annular, the outer wall part (1011) extends downward along the outer periphery of the top wall part (1012), the outer wall part (1011) and the inner wall part (1013) are substantially hollow cylindrical, the inner wall part (1013) extends axially downward along the inner periphery of the top wall part (1012), the inner wall part (1013) comprises a matching hole part (10131), the outer wall part (1011) is fixedly connected with the second valve seat part (102); The nut assembly (40) comprises a nut body part (401), the nut body part (401) comprises an outer edge section (4011), the outer edge section (4011) matches with the matching hole part (10131), the valve seat assembly (10) and the nut assembly (40) are fixedly connected, the nut assembly (40) is insert molded by the nut connecting part (402), the lower surface of the nut connecting part (402) matches with the upper surface of the top wall part (1012).

2. The motorized valve of claim 1, wherein, The outer edge section (4011) and the inner wall part (1013) are interference press-fitted or transition fitted.

3. The motorized valve of claim 1, wherein, The outer edge section (4011) and the matching hole part (10131) are clearance fitted, the single-side clearance between the outer edge section (4011) and the matching hole part (10131) is less than or equal to 0.15mm.

4. The motorized valve of claim 1, wherein, The lower end of the inner wall part (1013) is lower than the highest position of the first pipe connecting part (103).

5. The motorized valve of claim 1, wherein, The nut connecting part (402) is welded with the top wall part (1012).

6. The motorized valve of claim 5, wherein, The lower surface of the nut connecting part (402) is planar, the upper surface of the top wall part (1012) is planar, the lower surface of the nut connecting part (402) matches with the upper surface of the top wall part (1012) and is welded.

7. The motorized valve of claim 1, wherein, The top wall part (1012) comprises a balance hole part (1014) which penetrates the top wall part (1012).

8. The motorized valve of claim 1, wherein, The first valve seat part (101) comprises a step part (10112) which is annular, the step part (10112) comprises a step horizontal part (101121) and a step vertical part (101122), the outer shell (30) is sleeved on the step vertical part (101122), the outer shell (30) and the step horizontal part (101121) have an overlapping area along the projection of the plane where the cross section of the electric valve is located, the outer shell (30) is fixedly connected with the valve seat assembly (10).

9. The motorized valve of claim 8, wherein, The opening side of the shell (30) is horizontal, the horizontal step part (101121) is horizontal, the shell (30) and the step part (101121) are matched, and the shell (30) and the valve seat assembly (10) are fixedly connected.

10. The motorized valve of claim 1, wherein, The second valve seat part (102) comprises an insertion part (1021) and a limiting part (1022), the insertion part (1021) is inserted from the opening of the outer wall part (1011), the insertion part (1021) and the outer wall part (1011) along the plane of the longitudinal section of the electric valve exist an overlapping area along the orthographic projection of the plane, and the outer wall part (1011) and the limiting part (1022) along the plane of the transverse section of the electric valve exist an overlapping area along the orthographic projection of the plane.

Images