An electrically operated valve

Abstract

The electric valve has a valve core rotor assembly, which comprises a valve shaft assembly, a valve core assembly, first / second elastic members, and a gasket component. The valve shaft assembly comprises first / second valve shaft through hole parts and a containing part. The first elastic member and the gasket component are located in the containing part. The valve shaft assembly further comprises first / second / third / fourth valve shaft abutting parts. The first elastic member abuts against the second valve shaft abutting part and the gasket component. The gasket component can abut against the third valve shaft abutting part. The valve core assembly is arranged through the valve shaft assembly and the gasket component hole part. The valve core assembly comprises first / second / third valve core abutting parts. The first valve core abutting part can abut against the first valve shaft abutting part. The second elastic member is sleeved on the valve core assembly. The second elastic member abuts against the fourth valve shaft abutting part and the third valve core abutting part. The second valve core abutting part can abut against the gasket component.

Description

[0001] This application is a divisional application of patent application number 202111663783.8, filed on December 31, 2021, entitled "An Electric Valve". Technical Field

[0002] This invention relates to the field of refrigeration control technology, and in particular to an electric valve. Background Technology

[0003] See Figure 8 CN109723884A discloses an electric valve having a guide bushing 20 and a valve shaft retainer 30. The guide bushing 20 is provided with a fixed external thread portion 23, and the valve shaft retainer 30 is provided with a movable internal thread portion 33. The fixed external thread portion 23 and the movable internal thread portion 33 constitute the threaded feed mechanism 28 of the electric valve.

[0004] The electric valve has a circular pressure plate 61 sandwiched between the stepped surface 13 formed between the upper small-diameter portion 11 and the lower large-diameter portion 12 of the valve shaft 10 and the lower surface of the top 32 of the valve shaft holder 30. A compression coil spring (force-applying component) 60 is externally inserted into the upper small-diameter portion 11 of the valve shaft 10 and compressed in a direction that causes the valve shaft 10 and the valve shaft holder 30 to move away from each other in the lifting direction (axis O direction). In other words, the compression coil spring 60 always applies a downward force (valve core 14) to the valve shaft 10 (valve closing direction). Summary of the Invention

[0005] The purpose of this invention is to provide an electric valve, including a valve shaft assembly, a valve core assembly, a first elastic element, a second elastic element, and a gasket component;

[0006] The first elastic element and the washer component are located inside the valve shaft assembly. The valve shaft assembly further includes a first valve shaft abutment portion and a third valve shaft abutment portion. The upper end of the first elastic element abuts against the valve shaft assembly, and the lower end of the first elastic element abuts against the washer component. The washer component can abut against the third valve shaft abutment portion.

[0007] The valve core assembly passes through the valve shaft assembly and the washer component. The valve core assembly includes a first valve core abutment portion and a second valve core abutment portion. The first valve core abutment portion can abut against the first valve shaft abutment portion. The second elastic member is sleeved on the valve core assembly. The upper end of the second elastic member abuts against the valve shaft assembly, and the lower end of the second elastic member abuts against the first valve core assembly. The second valve core abutment portion can abut against the washer component.

[0008] When the first valve core abutting part and the first valve shaft abutting part abut against each other, and when the second valve core abutting part and the washer component do not abut against each other, the elastic force of the first elastic element on the washer component is greater than the elastic force of the second elastic element on the valve core assembly.

[0009] In the electric valve of this application, when the washer component abuts against the third valve shaft contact portion and the second valve core contact portion and the washer component do not abut against each other, the elastic force of the first elastic element is borne by the valve shaft assembly. The elastic force of the first elastic element on the washer component is greater than the elastic force of the second elastic element on the valve core assembly, which can reduce the impact force of the valve core assembly on the valve port at the moment of contact between the valve core assembly and the valve port. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the electric valve of the present invention in the fully closed state;

[0011] Figure 2 This is a structural schematic diagram of the electric valve seat component of the present invention;

[0012] Figure 3 This is a cross-sectional view of the valve core rotor assembly when the electric valve of the present invention is in the fully closed state;

[0013] Figure 4 This is a cross-sectional view of the valve core rotor assembly of the electric valve of the present invention when the valve core assembly is not bearing the elastic force of the first elastic element;

[0014] Figure 5 This is a cross-sectional view of the valve core rotor assembly of the electric valve of the present invention when the valve core head is just not in contact with the valve port.

[0015] Figure 6 This is a cross-sectional view of the valve core rotor assembly when the third elastic element of the electric valve of the present invention just contacts the outer shell;

[0016] Figure 7 This is a cross-sectional view of the valve core rotor assembly when the electric valve of the present invention is over-opened to the point where the threaded pair disengages.

[0017] Figure 8 This is a cross-sectional view of an electric valve in the background art;

[0018] in, Figures 1-8 Includes the following reference numerals:

[0019] 10 Valve seat assembly; 101 Valve seat; 102 Nut; 103 First connecting pipe part; 104 Second connecting pipe part; 10a Valve port part; 10b Internal thread part; 10c Fixed stop part; 10d First inlet / outlet channel; 10e Second inlet / outlet channel; 20 Valve core rotor assembly; 201 Valve shaft assembly; 2011 Valve shaft; 2012 Bushing; 20121 Bushing hole part; 2016 Outer edge part; 20161 First outer edge part; 20162 Second outer edge part; 201a External thread part; 201b Movable stop part; 201c Rotor fixing part; 201d First valve shaft through hole part; 201e Receiving part; 201f Second valve shaft through hole part; 201g First valve shaft abutting part; 201h Second valve shaft abutting part; 201i Third valve shaft abutting part; 201j Fourth valve shaft abutting part; 202 Valve core assembly; 2021 Valve core body part; 2022 Valve core sleeve; 20221 Valve core sleeve hole part; 202a Valve core head; 202b First valve core abutting part; 202c Second valve core abutting part; 202d Third valve core abutting part; 203 Rotor; 204 Second elastic element; 205 Third elastic element; 206 Washer component; 2061 Washer component hole part; 208 First elastic element; 30 Housing. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Please refer to Figures 1 to 7 ,in, Figure 1 This is a cross-sectional view of the electric valve of the present invention in the fully closed state; Figure 2 This is a structural schematic diagram of the electric valve seat component of the present invention; Figure 3 This is a cross-sectional view of the valve core rotor assembly when the electric valve of the present invention is in the fully closed state; Figure 4 This is a cross-sectional view of the valve core rotor assembly of the electric valve of the present invention when the valve core assembly is not bearing the elastic force of the first elastic element; Figure 5 This is a cross-sectional view of the valve core rotor assembly of the electric valve of the present invention when the valve core head is just not in contact with the valve port. Figure 6 This is a cross-sectional view of the valve core rotor assembly when the third elastic element of the electric valve of the present invention just contacts the outer shell; Figure 7 This is a cross-sectional view of the valve core rotor assembly when the electric valve of the present invention is over-opened to the point where the threaded pair disengages.

[0022] Please refer to the following for details. Figures 1 to 3 In one specific embodiment, the electric valve provided by the present invention includes a valve body and a coil (not shown in the figure), the coil being sleeved on the valve body, and the valve body including a valve core rotor assembly 20. Figure 3 As shown), valve seat component 10 ( Figure 2 (as shown) and housing 30 ( Figure 1(As shown). The coil 40 of the electric valve is connected to the drive controller. After the drive controller is energized, it sends a pulse drive signal to the coil, which generates a changing magnetic field, thereby driving the valve core rotor assembly 20 of the electric valve to rotate in the forward or reverse direction.

[0023] One end of the housing 30 is open. The housing 30 is a thin-walled part and is in the shape of a cover. The lower open side of the housing 30 is sealed and welded to the valve seat component 10, thereby forming a receiving chamber that can accommodate the upper part of the nut 102 (mentioned below) and the main body of the valve core rotor assembly 20 (mentioned below).

[0024] See Figure 3 The valve core rotor assembly 20 includes a valve shaft assembly 201. In this embodiment, the valve shaft assembly 201 includes a valve shaft 2011 and a bushing 2012. The bushing 2012 is fixed at approximately the upper end of the valve shaft 2011 and includes a bushing hole 20121 extending through its upper and lower surfaces. The valve shaft 2011 is provided with an external thread 201a.

[0025] See Figure 2 The valve seat component 10 includes a nut 102. The inner hole of the nut 102 is provided with an internal thread 10b. The valve shaft 2011 is threadedly engaged with the nut 102. While the valve core rotor assembly 20 rotates, the valve shaft 2011 will move along the axial direction, thereby driving the valve core assembly 202 to realize the opening and closing action of the valve port 10a.

[0026] See Figure 1 , Figure 2 The valve seat component 10 has a valve port portion 10a, a first inlet / outlet channel 10d, and a second inlet / outlet channel 10e. The valve port portion 10a can communicate with the first inlet / outlet channel 10d and the second inlet / outlet channel 10e to allow fluid medium (e.g., refrigerant) to pass through. In addition, a through hole is provided at approximately the center position of the valve seat component 10, and an internal thread portion 10b (also referred to as a fixed thread portion) is provided on the inner wall of the through hole. The internal thread portion 10b and the external thread portion 201a (also referred to as a movable thread portion) provided at approximately the lower position of the valve shaft 2011 constitute the helical feed mechanism (thread pair) of this electric valve.

[0027] In this embodiment, the valve seat component 10 includes a nut 102 with a through hole and an internal thread 10b on the inner wall of the through hole. The valve seat component 10 also includes a valve seat 101, with a portion of the nut 102 located within the valve seat 101. The nut 102 is fixedly connected to the valve seat 101 (for example, by integrally injection molding the connector as an insert with the nut 102, and then welding or press-fitting the connector to the valve seat 101, or by directly press-fitting the nut 102 to the valve seat 101; in this embodiment, the connector is integrally molded with the nut 102 as an insert). The nut 102 and the valve seat 101 are fixedly connected by injection molding and welding of the connector to the valve seat 101. The valve seat 101 is integrally formed with a valve port 10a (or the valve port 10a can be formed on other parts and then fixedly connected to the valve seat 101). In addition, in this embodiment, the valve seat 101 is fixedly connected to the first connecting pipe 103 and the second connecting pipe 104. The first connecting pipe 103 and the second connecting pipe 104 serve as the inflow or outflow channels for the fluid medium of the electric valve. When installed in air conditioning or other refrigeration and heating systems, they are generally used to connect to the system pipeline.

[0028] In this embodiment, the first connecting part 103 and the second connecting part 104 are welded to the valve seat 101. Alternatively, the first connecting part 103 and the second connecting part 104 can be omitted, and the refrigerant flow path can be directly connected to the valve seat 101. Alternatively, the first connecting part 103 or the second connecting part 104 can also be connected by a flange seal, for example, in applications such as automotive air conditioning or heat pumps where rapid maintenance is required. This embodiment uses an electric valve with the first connecting part 103 and the second connecting part 104 as an example.

[0029] See Figure 2 , combined Figure 1 The nut 102 protrudes from the annular base and is provided with a fixed stop part 10c, which cooperates with the movable stop part 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 component 10 to a certain extent, the movable stop part 201b can abut against the fixed stop part 10c to limit the rotation of the valve core rotor assembly 20 relative to the valve seat component 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.

[0030] Please refer to Figure 3The valve core rotor assembly 20 also includes a rotor 203 and a valve core assembly 202. The rotor 203 has magnetic poles in the circumferential direction. The valve core assembly 202 passes through the central through hole of the valve shaft assembly 201. In addition, the valve core rotor assembly 20 also includes a first elastic element 208 disposed in the valve shaft assembly 201 and a second elastic element 204 disposed below the valve shaft assembly 201. The first elastic element 208 and the second elastic element 204 can be designed as cylindrical helical springs. The first elastic element 208 and the second elastic element 204 are both sleeved on the valve core assembly 202.

[0031] The valve shaft assembly 201 of this application includes a first valve shaft through hole 201d, a receiving portion 201e, and a second valve shaft through hole 201f. In this embodiment, the first valve shaft through hole 201d is a bushing hole 20121. The second valve shaft through hole 201f is provided at approximately the lower part of the valve shaft assembly 201. The receiving portion 201e is located between the first valve shaft through hole 201d and the second valve shaft through hole 201f. The first elastic member 208 and the washer member 206 are located in the receiving portion 201e. The washer member 206 can be annular or in the form of an open retaining ring. In this embodiment, the outer contour of the washer component 206 is approximately circular, and the second valve shaft through hole portion 201f is also approximately circular. Therefore, the outer diameter of the washer component 206 is larger than the diameter of the second valve shaft through hole portion 201f. Thus, the washer component 206 can abut against the third valve shaft abutment portion 201i and is confined within the receiving portion 201e. Furthermore, the outer diameter of the washer component 206 is slightly smaller than the diameter of the receiving portion 201e.

[0032] The electric valve of this application also includes a first valve shaft abutment portion 201g, a second valve shaft abutment portion 201h, a third valve shaft abutment portion 201i, and a fourth valve shaft abutment portion 201j. The upper end of the first elastic member 208 abuts against the second valve shaft abutment portion 201h (in this embodiment, the lower end of the bushing 2012), and the lower end of the first elastic member 208 abuts against the washer component 206. The washer component 206 can abut against the third valve shaft abutment portion 201i. The elastic force of the first elastic member 208 can be transmitted to the third valve shaft abutment portion 201i through the washer component 206. Therefore, the first elastic member 208 and the third valve shaft abutment portion 201i can also abut against each other.

[0033] The electric valve of this application also includes a valve core assembly 202, which has a stepped shaft-like structure and includes a valve core head 202a. The valve core head 202a is located at approximately the lower end of the valve core assembly 202. The tip shape of the valve core head 202a is related to the flow regulation curve required by the electric valve. The valve core assembly 202 passes through the valve shaft assembly (first valve shaft through hole 201d, receiving part 201e, and second valve shaft through hole 201f) and through the washer component hole 2061. The upper end of the valve core assembly 202 is located above the valve shaft assembly 201, and the lower end of the valve core assembly 202 is located below the valve shaft assembly 201. Specifically, the valve core assembly 202 includes a first valve core abutment portion 202b, a second valve core abutment portion 202c, and a third valve core abutment portion 202d. The first valve core abutment portion 202b is located above the second valve core abutment portion 202c and the third valve core abutment portion 202d, and it can abut against the first valve shaft abutment portion 201g to restrict the valve core assembly 202 from passing through the central through hole of the valve shaft assembly 201 from top to bottom. In this embodiment, the outer contour of the first valve core abutment portion 202b and the first valve shaft through hole portion 201d are both circular. Therefore, the diameter of the first valve core abutment portion 202b is larger than the diameter of the first valve shaft through hole portion 201d.

[0034] The second elastic member 204 is sleeved on the valve core assembly 202, and the second elastic member 204 is located below the valve shaft assembly 201. The upper end of the second elastic member 204 abuts against the fourth valve shaft abutment portion 201j, and the lower end of the second elastic member 204 abuts against the third valve core abutment portion 202d.

[0035] The washer component 206 can be switched between abutting against the third valve shaft abutment portion 201i or abutting against the second valve core abutment portion 202c. Specifically, in the plane containing the cross-section of the valve shaft assembly 201, the orthographic projection of the washer component 206 along the plane overlaps with the orthographic projection of the second valve core abutment portion 202c along the plane, and also overlaps with the orthographic projection of the third valve shaft abutment portion 201i along the plane.

[0036] In this embodiment, the first valve core abutment portion 202b, the second valve core abutment portion 202c, and the third valve core abutment portion 202d all have annular stepped structures.

[0037] When the first valve core abutting part 202b abuts against the first valve shaft abutting part 201g, the second valve core abutting part 202c does not abut against the washer component 206. The washer component 206 is subjected to the elastic force of the first elastic member 208 and abuts against the third valve shaft abutting part 201i. The electric valve of this application also exists in the following state: when the second valve core abutting part 202c abuts against the washer component 206, the washer component 206 abuts against the third valve shaft abutting part 201i.

[0038] In this embodiment, the distance between the first valve core abutment portion 202b and the second valve core abutment portion 202c is D1, and the distance between the first valve shaft abutment portion 201g and the third valve shaft abutment portion 201i is D2, where D1 is greater than D2.

[0039] Furthermore, in the electric valve of this application, when the washer component 206 abuts against the third valve shaft abutment portion 201i, and the second valve core abutment portion 202c and the washer component 206 do not abut against each other, the elastic force of the washer component 206 on the first elastic member 208 is greater than the elastic force of the valve core assembly 202 on the second elastic member 204. Through the above arrangement, when the washer component 206 abuts against the third valve shaft abutment portion 201i, and the second valve core abutment portion 202c and the washer component 206 do not abut against each other, the elastic force of the first elastic member 208 is borne by the valve shaft assembly 201, and the elastic force of the washer component 206 on the first elastic member 208 is greater than the elastic force of the valve core assembly 202 on the second elastic member 204. This can reduce the impact force of the valve core assembly 202 on the valve port 10b at the moment of contact between the valve core assembly 202 and the valve port 10a.

[0040] Continue to refer to Figure 3 In this embodiment, the valve shaft 2011 includes an outer edge portion 2016, which includes 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. On the plane containing the cross-section of the valve shaft assembly 201, the orthographic projection of the first outer edge portion 20161 along this plane is outside the orthographic projection of the second outer edge portion 20162 along this plane. Typically, for ease of manufacturing, the cross-sections of both the first outer edge portion 20161 and the second outer edge portion 20162 are set to circular. The valve shaft assembly 201 where part 20161 is located is provided with a rotor fixing part 201c. The rotor 203 and the rotor fixing part 201c can be fixed by direct or indirect welding, riveting, injection molding of magnetic plastic material, adhesive bonding, etc. In this embodiment, a connector is used as an insert to be injection molded with magnetic plastic material, and then the valve shaft 2011 is fixedly connected to the connector by welding. When the rotor 203 and the valve shaft 2011 are directly connected, the valve shaft 2011 can also be used as an insert to be integrally injection molded with magnetic plastic material.

[0041] An external thread 201a is provided at the position of the valve shaft 2011 where the second outer edge 20162 is located. This external thread 201a (also called the movable thread) and the internal thread 10b (also called the fixed thread) provided in the inner hole of the nut 102 together constitute the helical feed mechanism (thread pair) of this electric valve.

[0042] See Figure 3The valve core assembly 202 provided in this embodiment includes a valve core body 2021 and a valve core sleeve 2022. In this embodiment, the valve core sleeve 2022 includes a valve core sleeve hole 20221. The upper part of the valve core body 2021 is located inside the valve core sleeve hole 20221. The two are fixedly connected by press fitting or welding. In this embodiment, the valve core sleeve 2022 can abut against the first valve shaft abutment part 201g. Therefore, the lower end of the valve core sleeve 2022 is divided into the first valve core abutment part 202b.

[0043] In this embodiment, during installation, the valve core body 2021, opposite to the valve core head 202a, can be inserted from bottom to top into the lower end of the valve shaft assembly 202 (passing sequentially through the second valve shaft through hole 201f, the receiving part 201e, and the first valve shaft through hole 201d). After the upper end of the valve core body 2021 emerges from the first valve shaft through hole 201d, the end of the valve core body 2021 that emerges from the first valve shaft through hole 201d is then fixedly connected to the valve core sleeve 2022.

[0044] Furthermore, in this embodiment, the valve shaft assembly 202 includes a valve shaft 2011 and a bushing 2012. Both the valve shaft 2011 and the bushing 2012 have a hollow structure. The central through hole of the bushing 2012 is the first valve shaft through hole portion 201d. The valve shaft 2011 and the bushing 2012 are fixedly connected. The upper part of the bushing 2012 can abut against the first valve core abutment portion 202b. The bushing 2012 includes a first valve shaft abutment portion 201g. The lower part of the bushing 2012 can abut against the first elastic member 208. The bushing 2012 includes a second valve shaft abutment portion 201h.

[0045] Figure 3 The valve core rotor assembly 20 shown is the state when the electric valve is fully closed (i.e., when the valve core rotor assembly 20 is at the lowest point of its stroke). Figure 1 As shown, the valve core head 202a abuts against and presses tightly against the valve port 10a. The first elastic element 208 and the second elastic element 204 are both compressed. The washer component 206 abuts against the second valve core contact portion 202c but not against the third valve shaft contact portion 201i. This means the valve core assembly 202 is simultaneously subjected to two downward elastic forces. The first downward elastic force comes from the further compression of the first elastic element 208, which is transmitted to the valve core assembly 202 through the washer component 206. The second downward elastic force comes from the compression of the second elastic element 204. The superposition of these two forces provides a clamping force between the valve core assembly 202 and the valve port 10a, improving the performance of the electric valve against reverse pressure differential when fully closed.

[0046] Compared with the electric valves of the prior art, the electric valve of this application adds a second elastic element 204 on the basis of the first elastic element 208. The elastic force of the second elastic element 204 can be superimposed with the elastic force of the first elastic element 208, thereby further improving the elastic force acting on the valve core assembly 202 and further enhancing the ability of the electric valve to resist reverse pressure difference when fully closed.

[0047] See Figure 4 This is a cross-sectional view of the valve body when the electric valve of the present invention is opened to the point where the valve core assembly 202 just does not bear the elastic load of the first elastic member 208, and a partially enlarged view thereof. Figure 4 The position of the valve core rotor assembly 20 in the middle and Figure 1 Compared to the rotor position when the electric valve is fully closed, its valve core rotor assembly 20 is open upwards, and the valve core head 202a still abuts against the valve port 10a. Figure 4 The position of the valve core rotor assembly 20 shown is a critical point. If the valve core rotor assembly 20 continues to open upwards, the elastic force of the first elastic element 208 will be transmitted through the washer component 206 and borne by the third valve shaft abutment part 201i. The valve core assembly 202 will no longer be subjected to the elastic force load of the first elastic element 208. At this time, the elastic force of the second elastic element 204 is still transmitted to the valve core assembly 202, and the valve core assembly 202 is still subjected to the downward elastic force load of the second elastic element 204. Figure 4 The valve core 2023 shown is subjected to a downward elastic force from the second elastic member 204, and its valve core head 202a abuts against the valve port 10a.

[0048] See Figure 5 This is a cross-sectional view of the valve body of the electric valve of the present invention when the valve core head is just not in contact with the valve port 10a, and a partially enlarged view thereof. Figure 5 The position of the valve core rotor assembly 20 in the middle and Figure 4 Compared to the position of the valve core rotor assembly 20, its upward opening height is D1-D2. At this time, the valve core head 202a is just at the critical state of abutting the valve port 10a, and the distance between the washer component 206 and the second valve core abutment part 202c is also D1-D2. The valve core assembly 202 is subjected to the downward elastic force of the second elastic member 204, and the elastic force of the first elastic member 208 is transmitted through the washer component 206 and borne by the third valve shaft abutment part 201i.

[0049] Figure 5 The state shown is the critical state where the valve core head 202a is just in contact with the valve port 10a. During frequent opening and closing of the electric valve, the impact force and wear between the sealing parts of the valve core head 202a and the valve port 10a are significant at the instant they contact and separate. This critical state occurs when the valve core head 202a is just in contact with the valve port 10a (i.e.,...). Figure 5In the state shown, the valve core 2023 is not subjected to the elastic load of the first elastic element 208, but only to the elastic load of the second elastic element 204. At this time, the elastic load of the gasket component 206 on the first elastic element 208 is greater than the elastic load of the valve core assembly 202 on the second elastic element 204. Therefore, the clamping force experienced by the electric valve of the present invention at the moment of contact and separation between the valve core assembly 202 and the valve port 10a is not particularly large. Thus, wear between the valve core assembly 202 and the valve port 10b can be reduced, thus reducing the problem of leakage at the valve port 10a due to wear.

[0050] See Figure 6 This is a cross-sectional view of the valve body when the electric valve of the present invention is opened to its maximum opening degree, and a partially enlarged view thereof. The electric valve in this embodiment also includes a third elastic element 205, which is sleeved on the valve core sleeve 2022. The valve core rotor assembly 20 of the electric valve... Figure 5 The location shown is opened to Figure 6 At the position shown, the valve core assembly 202 is constantly subjected to the pressure difference between the two ends of the valve port 10a, the elastic force of the second elastic element 204, and its own weight. The first valve core abutment portion 202b is always in contact with the first valve shaft abutment portion 201g. The elastic force of the first elastic element 208 is transmitted through the washer component 206 and borne by the third valve shaft abutment portion 201i. The valve core rotor assembly 20 is in... Figure 6 When the valve core rotor assembly 20 is in the position shown, it is opened to its maximum opening position under normal working conditions. At this time, the top end of the third elastic element 205 at the upper end of the valve core rotor assembly 20 just contacts the top inner wall of the housing 30.

[0051] See Figure 7 This is a cross-sectional view of the valve body of the electric valve of the present invention when it is over-opened to the point where the threaded pair disengages, and a partially enlarged view thereof. From Figure 6 Starting from the state shown, if the valve core rotor assembly 20 continues to open upwards, an over-opening state will occur (over-opening: refers to the state where the valve core rotor assembly 20 opens upwards beyond its specified upper limit stroke). As the valve core rotor assembly 20 moves upwards, the third elastic element 205 is compressed downwards. Figure 7 In the middle, the third elastic element 205 is relative to Figure 6 The valve core rotor assembly 20 is further compressed downwards by a certain amount, and is subjected to a downward elastic load from the third elastic element 205. If the valve core rotor assembly 20 is further over-opened, the external thread 201a of the valve shaft assembly 201 will disengage from the internal thread 10b of the nut 102 (i.e., Figure 7(As shown in the state), after the screw engagement is disengaged, the valve core rotor assembly 20 will no longer move upward. If the coil 40 drives the valve core rotor assembly 20 in the direction of closing the electric valve, the valve core rotor assembly 20 will be subjected to the downward elastic load of the third elastic element 205. When the valve core rotor assembly 20 rotates, the threaded pair will re-engage.

[0052] Combination Figure 1 , Figure 4 , Figure 5 and Figure 6 The rotor component 20 changes from the fully closed state to the fully open state. Figure 4 When the opening degree begins to open upwards, or from Figure 6 Fully open state Figure 4 When the valve is closed, the valve core assembly 202 is not subjected to the elastic load of the first elastic element 208. In particular, at the moment when the valve core head 202a makes contact with the sealing part of the valve port 10a, the impact force of the valve core assembly 202 on the valve port 10a can be reduced, and the frictional force of the relative rotational movement between the sealing parts can also be reduced, thereby reducing the wear of the contact parts.

[0053] While some components of the electric valve may be modified through conventional separation and integration, the functions of their geometrically corresponding parts remain essentially the same after assembly. This still falls within the scope of the present invention. Although the structure has undergone certain changes, the function of the geometrically corresponding parts has not been altered in essence. These structures with adaptive modifications and combinations also fall within the scope of protection of the claims of this invention.

[0054] Furthermore, it should be noted that in the embodiments shown in this specification, a washer or gasket may be added to the lower end of the second elastic member 204, or a washer may be provided between the first valve core abutment portion 202b and the valve shaft assembly 201, or a washer or gasket may be added to the upper end of the second elastic member 204. These methods do not affect the core content of this application. The abutment of the two components in this application includes the two components directly abutting each other or the two components indirectly abutting each other through other parts.

[0055] In addition, to further reduce the frictional resistance of the relative rotation of the gaskets or washers on their upper and lower surfaces subject to rotational friction, a coating with lubricating and wear-resistant properties (such as a coating containing polytetrafluoroethylene, graphite, or molybdenum disulfide) can be sprayed or plated onto their surfaces, thereby improving the service life of the electric valve.

[0056] Based on the above embodiments, any adaptive changes made to the addition of anti-friction washers or gaskets using the core structure of this invention should fall within the scope of protection of the claims of this invention.

[0057] It is worth noting that this solution provides multiple options regarding the formation of the valve port 10a and whether or not a connecting pipe is installed, and the specification uses the word "may" to indicate that the word "may" in this application should not be interpreted as "must".

[0058] The "a" or "b" mentioned in this invention, when "a" and "b" do not conflict, includes the cases of "a", "b", and "ab".

[0059] It should be noted that the directional terms such as up, down, left, and right mentioned in this embodiment are all based on the accompanying drawings in the specification and are introduced for ease of description; and the ordinal numbers such as "first" and "second" in the component names are also introduced for ease of description and do not imply any limitation on the order of the components.

[0060] The electric valve provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An electric valve, characterized in that, It includes a valve shaft assembly (201), a valve core assembly (202), a first elastic element (208), a second elastic element (204), and a gasket assembly (206); The first elastic member (208) and the washer component (206) are located inside the valve shaft assembly (201). The valve shaft assembly (201) includes a first valve shaft abutment portion (201g) and a third valve shaft abutment portion (201i). The upper end of the first elastic member (208) abuts against the valve shaft assembly (201), and the lower end of the first elastic member (208) abuts against the washer component (206). The washer component (206) can abut against the third valve shaft abutment portion (201i). The valve core assembly (202) passes through the valve shaft assembly (201) and through the gasket component (206). The valve core assembly (202) includes a first valve core abutment portion (202b) and a second valve core abutment portion (202c). The first valve core abutment portion (202b) can abut against the first valve shaft abutment portion (201g). The second elastic member (204) is sleeved on the valve core assembly (202). The upper end of the second elastic member (204) abuts against the valve shaft assembly (201), and the lower end of the second elastic member (204) abuts against the valve core assembly (202). The second valve core abutment portion (202c) can abut against the gasket component (206). When the first valve core abutting part (202b) and the first valve shaft abutting part (201g) abut against each other, and the second valve core abutting part (202c) and the washer component (206) do not abut against each other, the elastic force of the washer component (206) on the first elastic member (208) is greater than the elastic force of the valve core assembly (202) on the second elastic member (204).

2. The electric valve according to claim 1, characterized in that, The electric valve also exists in the following states: the second valve core abutment part (202c) and the washer component (206) abut against each other, and the washer component (206) and the third valve shaft abutment part (201i) do not abut against each other; Alternatively, the second valve core abutment portion (202c) abuts against the gasket component (206), and the gasket component (206) abuts against the third valve shaft abutment portion (201i).

3. The electric valve according to claim 1, characterized in that, The distance D1 between the first valve core abutment portion (202b) and the second valve core abutment portion (202c) is greater than the distance D2 between the first valve shaft abutment portion (201g) and the third valve shaft abutment portion (201i).

4. The electric valve according to claim 1, characterized in that, The valve shaft assembly (201) includes a first valve shaft through hole (201d), a receiving portion (201e), and a second valve shaft through hole (201f). The receiving portion (201e) is located between the first valve shaft through hole (201d) and the second valve shaft through hole (201f). The radial dimension of the receiving portion (201e) is greater than the radial dimension of the first valve shaft through hole (201d) and also greater than the radial dimension of the second valve shaft through hole (201f). The connection between the receiving portion (201e) and the first valve shaft through hole portion (201d) forms a downward-facing second valve shaft abutment portion (201h), and the connection between the receiving portion (201e) and the second valve shaft through hole portion (201f) forms an upward-facing third valve shaft abutment portion (201i). The first elastic member (208) and the washer component (206) are located in the receiving portion (201e); the upper end of the first elastic member (208) abuts against the second valve shaft abutment portion (201h).

5. The electric valve according to any one of claims 1-4, characterized in that, The valve core assembly (202) includes an upper portion located above the valve shaft assembly (201), the upper portion including the first valve core abutment portion (202b), and the upper end surface of the valve shaft assembly (201) forming the first valve shaft abutment portion (201g).

6. The electric valve according to claim 5, characterized in that, The valve core assembly (202) includes a valve core body (2021) and a valve core sleeve (2022). The upper end of the valve core body (2021) extends out of the valve core assembly (202) and is fixedly connected to the valve core sleeve (2022). The upper end includes the valve core sleeve (2022), and the valve core sleeve (2022) includes the first valve core abutment portion (202b).

7. The electric valve according to any one of claims 1-4, characterized in that, The valve core assembly (202) includes a lower end portion located below the valve shaft assembly (201), and the second elastic member (204) is sleeved on the lower end portion. The valve core assembly (202) includes a third valve core abutment portion (202d), and the lower end portion of the second elastic member (204) abuts against the third valve core abutment portion (202d).

8. The electric valve according to claim 7, characterized in that, The lower end face of the valve shaft assembly (201) forms a fourth valve shaft abutment portion (201j), and the upper end of the second elastic member (204) abuts against the fourth valve shaft abutment portion (201j).

9. The electric valve according to any one of claims 1-4, characterized in that, The valve shaft assembly (201) includes a valve shaft (2011) and a bushing (2012). The valve shaft (2011) and the bushing (2012) are hollow. At least a portion of the bushing (2012) is located inside the valve shaft (2011). The valve shaft (2011) and the bushing (2012) are fixedly connected. The upper end of the bushing (2012) forms the first valve shaft abutment portion (201g). The lower end of the valve shaft (2012) forms a second valve shaft abutment portion (201h), the upper end of the first elastic member (208) abuts against the second valve shaft abutment portion (201h), the valve shaft (2011) includes the third valve shaft abutment portion (201i), the lower end face of the valve shaft (2011) forms a fourth valve shaft abutment portion (201j), and the upper end of the second elastic member (204) abuts against the fourth valve shaft abutment portion (201j).

10. The electric valve according to any one of claims 1-4, characterized in that, The electric valve also includes a third elastic element (205) and a housing (30). The third elastic element (205) is sleeved on the upper part. When the third elastic element (205) abuts against the housing (30), the first valve core abutting part (202b) abuts against the first valve shaft abutting part (201g), and the gasket component (206) abuts against the third valve shaft abutting part (201i) but does not abut against the second valve core abutting part (202c).

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