Electric valve

Abstract

A valve element rotor assembly of the electric valve comprises a valve shaft assembly, a valve element assembly, a first elastic piece, a second elastic piece and a gasket component, the valve shaft assembly comprises a first valve shaft through hole part, a second valve shaft through hole part and a containing part, the first elastic piece and the gasket component are located in the containing part, the valve shaft assembly further comprises a first valve shaft abutting part, a second valve shaft abutting part, a third valve shaft abutting part and a fourth valve shaft abutting part, and the first elastic piece 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 element assembly is arranged on the valve shaft assembly in a penetrating mode and penetrates through the gasket component hole part, the valve element assembly comprises a first valve element abutting part, a second valve element abutting part and a third valve element abutting part, the first valve element abutting part can abut against the first valve shaft abutting part, the valve element assembly is sleeved with the second elastic piece, and the second elastic piece abuts against the fourth valve shaft abutting part and the third valve element abutting part. The second valve element abutting portion can abut against the gasket component.

Description

[0001] This application is a divisional application of patent application number 202111663783.8, application date December 31, 2021, and application name “An Electric Valve”. Technical Field

[0002] The present invention relates to the technical field of refrigeration control, and in particular to an electric valve. Background Art

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

[0004] The valve shaft 10 of the electric valve is sandwiched between a step 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, and a circular plate-shaped pressure plate 61 is arranged on the lower surface side of the top 32 of the valve shaft holder 30, and a compression coil spring (force-applying component) 60 is compressed and arranged in a manner externally inserted into the upper small-diameter portion 11 of the valve shaft 10. The compression coil spring 60 applies force in a direction that moves the valve shaft 10 away from the valve shaft holder 30 in the lifting direction (axis O direction). In other words, the compression coil spring 60 always applies force to the valve shaft 10 (valve core 14) downward (valve closing direction). Summary of the Invention

[0005] The object of the present invention is to provide an electric valve, comprising a valve shaft assembly, a valve core assembly, a first elastic member, a second elastic member and a gasket component;

[0006] The first elastic member and the gasket member 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 portion of the first elastic member abuts against the valve shaft assembly, and the lower end portion of the first elastic member abuts against the gasket member. The gasket member can abut against the third valve shaft abutment portion.

[0007] The valve core assembly is provided on the valve shaft assembly and passes through the gasket 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 portion of the second elastic member abuts against the valve shaft assembly. The lower end portion of the second elastic member abuts against the first valve core assembly. The second valve core abutment portion can abut against the gasket component.

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

[0009] In the electric valve of the present application, when the gasket component abuts against the third valve shaft abutment portion, and the second valve core abutment portion and the gasket component do not abut against each other, the elastic force of the first elastic member is borne by the valve shaft assembly, and the elastic force of the gasket component exerted by the first elastic member is greater than the elastic force of the valve core assembly exerted by the second elastic member, which can reduce the impact force of the valve core assembly on the valve mouth portion at the moment the valve core assembly contacts the valve mouth portion. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0013] Figure 4 1 is a cross-sectional view of the valve core rotor assembly of the electric valve according to the present invention when the valve core assembly just does not bear the elastic force of the first elastic member;

[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 just does not contact the valve port;

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

[0016] Figure 7 It is a cross-sectional view of the valve core rotor assembly of the electric valve of the present invention when the threaded pair is over-opened and disengaged;

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

[0018] in, Figures 1-8 The following reference numerals are included:

[0019] 10 Valve seat component; 101 Valve seat; 102 Nut; 103 First connecting pipe portion; 104 Second connecting pipe portion; 10a Valve port portion; 10b Internal thread portion; 10c Fixed stop portion; 10d First inlet and outlet passage; 10e Second inlet and outlet passage; 20 Valve core rotor assembly; 201 Valve shaft assembly; 2011 Valve shaft; 2012 Bushing; 20121 Bushing hole portion; 2016 Outer edge portion; 20161 First outer edge portion; 20162 Second outer edge portion; 201a External thread portion; 201b Movable stop portion; 201c rotor fixing portion; 201d first valve shaft through-hole portion; 201e accommodating portion; 201f second valve shaft through-hole portion; 201g first valve shaft abutment portion; 201h second valve shaft abutment portion; 201i third valve shaft abutment portion; 201j fourth valve shaft abutment portion; 202 valve core assembly; 2021 valve core body portion; 2022 valve core sleeve; 20221 valve core sleeve hole portion; 202a valve core head portion; 202b first valve core abutment portion; 202c second valve core abutment portion; 202d third valve core abutment portion; 203 rotor; 204 second elastic member 204; 205 third elastic member; 206 gasket component; 2061 gasket component hole portion; 208 first elastic member; 30 outer shell. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is 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 is a cross-sectional view of the electric valve of the present invention in a fully closed state; Figure 2 It is a structural schematic diagram of the valve seat component of the electric valve of the present invention; Figure 3 It is a cross-sectional view of the valve core rotor assembly when the electric valve of the present invention is in a fully closed state; Figure 4 1 is a cross-sectional view of the valve core rotor assembly of the electric valve according to the present invention when the valve core assembly just does not bear the elastic force of the first elastic member; 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 just does not contact the valve port; Figure 6 This is a cross-sectional view of the valve core rotor assembly when the third elastic member of the electric valve of the present invention just contacts the housing; Figure 7 It is a cross-sectional view of the valve core rotor assembly of the electric valve of the present invention when the threaded pair is over-opened and disengaged;

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

[0023] One end of the shell 30 is open. The shell 30 is a thin-walled part in the shape of a cover. The lower open side of the shell 30 is tightly welded to the valve seat component 10, thereby forming a accommodating chamber that can accommodate the upper half 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 to the upper end of the valve shaft 2011. The bushing 2012 includes a bushing hole 20121 extending through the upper and lower surfaces of the bushing. The valve shaft 2011 is provided with an external threaded portion 201a.

[0025] See Figure 2 The valve seat component 10 includes a nut 102, and the inner hole of the nut 102 is provided with an internal threaded portion 10b. The valve shaft 2011 is threadedly matched with the nut 102. When 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 mouth portion 10a.

[0026] See Figure 1 、 Figure 2 The valve seat component 10 has a valve mouth portion 10a, and a first inlet and outlet channel 10d and a second inlet and outlet channel 10e. The valve mouth portion 10a can be connected to the first inlet and outlet channel 10d and the second inlet and outlet channel 10e to allow a fluid medium (such as a refrigerant) to pass through. In addition, a through hole that passes through the upper and lower parts is provided at the approximate center position of the valve seat component 10, and an internal threaded portion 10b (also referred to as a fixed threaded portion) is provided on the inner wall of the through hole. The internal threaded portion 10b is combined with the external threaded portion 201a (also referred to as a movable threaded portion) provided at a position approximately below the valve shaft 2011 to constitute a spiral feed mechanism (thread pair) of the electric valve.

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

[0028] In this embodiment, the first connecting portion 103 and the second connecting portion 104 are welded to the valve seat 101. Of course, the first connecting portion 103 and the second connecting portion 104 can also be omitted, and the flow path for the refrigerant fluid can be directly provided on the valve seat 101. Alternatively, the first connecting portion 103 or the second connecting portion 104 can also be connected by a flange seal, for example, in applications where the electric valve is used in automotive air conditioners, heat pumps, and other applications requiring rapid maintenance. In this embodiment, the electric valve is provided with the first connecting portion 103 and the second connecting portion 104 as an example.

[0029] See Figure 2 , combined with Figure 1 The nut 102 protrudes from the annular base and is provided with a fixed stop portion 10c, which cooperates with the movable stop portion 201b provided on the valve core rotor assembly 20 to constitute 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 to a certain extent relative to the valve seat component 10, the movable stop portion 201b can be against the fixed stop portion 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 movement 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 is passed through the central through hole of the valve shaft assembly 201. In addition, the valve core rotor assembly 20 also includes a first elastic member 208 arranged in the valve shaft assembly 201 and a second elastic member 204 arranged below the valve shaft assembly 201. The first elastic member 208 and the second elastic member 204 can be designed as cylindrical coil springs. The first elastic member 208 and the second elastic member 204 are both sheathed on the valve core assembly 202.

[0031] The valve shaft assembly 201 of the present application includes a first valve shaft through hole portion 201d, an accommodating portion 201e and a second valve shaft through hole portion 201f. In the present embodiment, the first valve shaft through hole portion 201d is a bushing hole portion 20121. A second valve shaft through hole portion 201f is provided at a substantially lower position of the valve shaft assembly 201. The accommodating portion 201e is located between the first valve shaft through hole portion 201d and the second valve shaft through hole portion 201f. The first elastic member 208 and the gasket component 206 are located in the accommodating portion 201e. The gasket component 206 can be in the form of a circular ring or an open retaining ring. In this embodiment, the outer contour of the gasket component 206 is roughly circular, and the second valve shaft through hole portion 201f is also roughly circular. Therefore, the outer diameter of the gasket component 206 is larger than the diameter of the second valve shaft through hole portion 201f. Therefore, the gasket component 206 can abut against the third valve shaft abutment portion 201i, and it is confined in the accommodating portion 201e, and the outer diameter of the gasket component 206 is slightly larger than the diameter of the accommodating portion 201e.

[0032] The electric valve of the present 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 sleeve 2012), and the lower end of the first elastic member 208 abuts against the gasket component 206. The gasket 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 gasket component 206, so the first elastic member 208 and the third valve shaft abutment portion 201i can also abut against each other.

[0033] The electric valve of the present application also includes a valve core assembly 202, which has a stepped shaft structure, including a valve core head 202a, and the valve core head 202a is located at the approximate lower end position 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 is inserted into the valve shaft assembly (the first valve shaft through-hole portion 201d, the accommodating portion 201e and the second valve shaft through-hole portion 201f) and passes through the gasket component hole portion 2061, and the upper end portion of the valve core assembly 202 is located above the valve shaft assembly 201, and the lower end portion 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 can abut against the first valve shaft abutment portion 201g to limit 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 externally mounted on the valve core assembly 202 and 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 gasket component 206 can switch between abutting against the third valve shaft abutment portion 201i or abutting against the second valve core abutment portion 202c. Specifically, in the plane where the cross section of the valve shaft assembly 201 is located, the gasket component 206 has an overlapping area with the orthographic projection of the second valve core abutment portion 202c along the plane, and also has an overlapping area with the orthographic projection of the third valve shaft abutment portion 201i along the plane.

[0036] In this embodiment, the first valve core abutting portion 202b, the second valve core abutting portion 202c and the third valve core abutting portion 202d are all annular step-shaped structures.

[0037] When the first valve core abutment portion 202b abuts against the first valve shaft abutment portion 201g, the second valve core abutment portion 202c does not abut against the gasket component 206, and the gasket component 206 is acted upon by the elastic force of the first elastic member 208 and abuts against the third valve shaft abutment portion 201i; the electric valve of the present application also has the following state, when the second valve core abutment portion 202c abuts against the gasket component 206, the gasket component 206 abuts against the third valve shaft abutment portion 201i.

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

[0039] In addition, in the electric valve of the present application, when the gasket component 206 abuts against the third valve shaft abutment portion 201i and the second valve core abutment portion 202c and the gasket component 206 do not abut against each other, the elastic force of the gasket component 206 exerted by the first elastic member 208 is greater than the elastic force of the valve core assembly 202 exerted by the second elastic member 204. Through the above-mentioned arrangement, when the gasket component 206 abuts against the third valve shaft abutment portion 201i and the second valve core abutment portion 202c and the gasket 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 gasket component 206 exerted by the first elastic member 208 is greater than the elastic force of the valve core assembly 202 exerted by the second elastic member 204. This can reduce the impact force of the valve core assembly 202 on the valve mouth portion 10b at the moment the valve core assembly 202 contacts the valve mouth portion 10a.

[0040] Continue to refer Figure 3 In this embodiment, the valve shaft 2011 includes an outer edge portion 2016, and the outer edge portion 2016 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. In the plane where the cross section of the valve shaft assembly 201 is located, the orthographic projection of the first outer edge portion 20161 along the plane is located outside the orthographic projection of the second outer edge portion 20162 along the plane. Usually, for ease of processing, the cross sections of the first outer edge portion 20161 and the second outer edge portion 20162 are both set to be circular, and the first outer edge portion The portion of the valve shaft assembly 201 where the part 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 molding connection, glue bonding, etc. In this embodiment, a connecting piece is used as an insert and is injection molded with the magnetic plastic material, and then the valve shaft 2011 and the connecting piece are fixedly connected 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 and is injection molded integrally with the magnetic plastic material.

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

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

[0043] During installation of the electric valve of this embodiment, the end of the valve core body 2021 opposite the valve core head 202a can be first inserted from the bottom up through the lower end of the valve shaft assembly 202 (through the second valve shaft through-hole 201f, the accommodating portion 201e, and the first valve shaft through-hole 201d in sequence). After the upper end of the valve core body 2021 passes through the first valve shaft through-hole 201d, the end of the valve core body 2021 that passes through the first valve shaft through-hole 201d is then fixedly connected to the valve core sleeve 2022.

[0044] In addition, in this embodiment, the valve shaft assembly 202 includes a valve shaft 2011 and a sleeve 2012. The valve shaft 2011 and the sleeve 2012 both have a hollow structure. The central through hole of the sleeve 2012 is the first valve shaft through hole portion 201d. The valve shaft 2011 and the sleeve 2012 are fixedly connected. The upper end portion of the sleeve 2012 can be abutted against the first valve core abutment portion 202b. The sleeve 2012 includes a first valve shaft abutment portion 201g. The lower end portion of the sleeve 2012 can be abutted against the first elastic member 208. The sleeve 2012 includes a second valve shaft abutment portion 201h.

[0045] Figure 3 The valve core rotor assembly 20 shown in FIG is the state when the electric valve is in full close state (ie the state when the valve core rotor assembly 20 is at the bottom of its stroke). Figure 1 As shown, the valve core head 202a abuts and presses against the valve mouth 10a. The first elastic member 208 and the second elastic member 204 are both in a compressed state. The gasket member 206 abuts against the second valve core abutment portion 202c, but does not abut against the third valve shaft abutment portion 201i. In other words, the valve core assembly 202 is simultaneously subjected to two downward elastic forces. The first downward elastic force comes from the elastic force generated by the further compression of the first elastic member 208, which is transmitted to the valve core assembly 202 through the gasket member 206; the second downward elastic force comes from the elastic force generated by the compression of the second elastic member 204. The combination of these two elastic forces provides a compressive force between the valve core assembly 202 and the valve mouth 10a, which can improve the performance of the electric valve in resisting reverse pressure differential when fully closed.

[0046] Compared with the electric valve of the background technology, the electric valve of the present application further includes a second elastic member 204 on the basis of the first elastic member 208. The elastic force of the second elastic member 204 can be superimposed on the elastic force of the first elastic member 208, thereby further increasing the elastic force acting on the valve core assembly 202 and further improving the ability of the electric valve to resist reverse pressure difference when it is fully closed.

[0047] See Figure 4 , is a cross-sectional view of the valve body of the electric valve of the present invention when the valve core assembly 202 is opened to the point where it just does not bear the elastic load of the first elastic member 208, and its partial enlarged view. Figure 4 The position of the valve core rotor assembly 20 in Figure 1 Compared with the rotor position of the electric valve when it is fully closed, the valve core rotor assembly 20 opens upward, and the valve core head 202a still contacts the valve mouth 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 upward, the elastic force of the first elastic member 208 will be transmitted through the gasket member 206 and borne by the third valve shaft abutment portion 201i, and the valve core assembly 202 will no longer be subjected to the elastic load of the first elastic member 208. At this time, the elastic force of the second elastic member 204 is still transmitted to the valve core assembly 202, and the valve core assembly 202 is still subjected to the downward elastic load of the second elastic member 204. Figure 4 The valve core 2023 shown in FIG is subjected to the downward elastic force of the second elastic member 204 , and the valve core head 202 a thereof abuts against the valve port 10 a .

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

[0049] Figure 5 The state shown is the critical state where the valve core head 202a is just in contact with the valve mouth 10a. When the electric valve needs to be frequently opened and closed, the impact force and wear between the sealing parts of the valve core head 202a and the valve mouth 10a are relatively large at the moment when the valve core head 202a and the valve mouth 10a are just in contact and separation. Figure 5(In the state shown, the valve core 2023 is not subjected to the elastic load of the first elastic member 208, but only to the elastic load of the second elastic member 204. At this time, the elastic load of the gasket component 206 subjected to the first elastic member 208 is greater than the elastic load of the valve core assembly 202 subjected to the second elastic member 204. Therefore, the pressing force applied to the electric valve of the present invention during the moments when the valve core assembly 202 contacts and separates from the valve port 10a is not particularly large. This can reduce wear between the valve core assembly 202 and the valve port 10b, thereby reducing the problem of leakage from the valve port 10a caused by wear.

[0050] See Figure 6 , is a cross-sectional view of the valve body of the electric valve of the present invention when it is opened to the maximum opening, and a partial enlarged view thereof. The electric valve in this embodiment also includes a third elastic member 205, which is outer-mounted on the valve core sleeve 2022. The valve core rotor assembly 20 of the electric valve is Figure 5 The position shown opens to Figure 6 In the position shown, the valve core assembly 202 is always affected by the pressure difference between the two ends of the valve mouth 10a, the elastic force of the second elastic member 204 and its own weight. The first valve core abutment portion 202b always abuts against the first valve shaft abutment portion 201g, and the elastic force of the first elastic member 208 is transmitted through the gasket component 206 and borne by the third valve shaft abutment portion 201i. Figure 6 In the position shown, the valve core rotor assembly 20 is opened to the maximum opening position under its normal working state. At this time, the top end of the third elastic member 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 , is a cross-sectional view of the valve body of the electric valve of the present invention when the threaded pair is over-opened and disengaged, and a partial enlarged view thereof. Figure 6 Starting from the state shown, if the valve core rotor assembly 20 continues to open upward, an over-open state will occur (over-opening: refers to the state when the valve core rotor assembly 20 opens upward beyond its specified upper limit stroke). As the valve core rotor assembly 20 moves upward, the third elastic member 205 is compressed downward. Figure 7 In the embodiment, the third elastic member 205 is relative to Figure 6 The state in the middle is further compressed downwards by a certain amount, and the valve core rotor assembly 20 is subjected to the downward elastic load of the third elastic member 205. If the valve core rotor assembly 20 is further opened excessively, the external threaded portion 201a of the valve shaft assembly 201 will be disengaged from the internal threaded portion 10b of the nut 102 (i.e. Figure 7As shown in the state shown), after the threaded connection 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 is subjected to the downward elastic load of the third elastic member 205. When the valve core rotor assembly 20 rotates, the thread pair will be re-threaded.

[0052] Combine Figure 1 、 Figure 4 、 Figure 5 and Figure 6 , the rotor component 20 changes from the fully closed state to the fully open state, from Figure 4 When the opening state starts to open upward, or from Figure 6 Fully open state Figure 4 When in the closed state, the valve core assembly 202 is not subjected to the elastic load of the first elastic member 208. In particular, at the moment when the valve core head 202a contacts the sealing portion of the valve mouth 10a, the impact force of the valve core assembly 202 on the valve mouth 10a can be reduced, and the friction force caused by the relative rotation between the sealing portions of the two can also be reduced, thereby reducing wear on the contact parts.

[0053] Some parts of the electric valve are subjected to conventional separation, integration and other changes, but the functions of their geometrically corresponding parts after assembly are basically the same, which still falls within the concept of the present invention. Although its structure has undergone certain changes, it has not essentially changed the functions of its geometrically corresponding parts. These structures that have undergone adaptive changes and combinations also fall within the scope of protection of the patent claims of this invention.

[0054] In addition, it should be noted that in the embodiments shown in this specification, a gasket or a washer can be added to the lower end of the second elastic member 204, or a gasket can be set between the first valve core abutment portion 202b and the valve shaft assembly 201, or a gasket or a gasket can be added to the upper end of the second elastic member 204. The above methods do not affect the core content of this application. The two components of this application offset each other, including the two components directly offsetting each other or the two components indirectly offsetting each other through other components.

[0055] In addition, in order to further reduce the frictional resistance of relative rotation, the upper and lower surfaces of the above-mentioned gasket or washer that are subject to rotational friction can be sprayed or plated with a coating having lubricating and wear-resistant functions (for example, a coating containing polytetrafluoroethylene, graphite, or molybdenum disulfide), thereby increasing the service life of the electric valve.

[0056] Based on the above embodiments, by utilizing the core structure of the present invention, some adaptive changes in adding friction-reducing washers or gaskets should fall within the scope of protection of the patent claims of the present invention.

[0057] It is worth noting that, regarding the above-mentioned formation method of the valve mouth portion 10a and whether to set a connecting pipe, this solution provides multiple solutions, and the word "can" is used in the specification. Therefore, it can be understood that the "can" in this application cannot be understood as "must".

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

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

[0060] The above describes the electric valve provided by the present invention in detail. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

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

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

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

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

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

6. The electric valve according to claim 5, characterized in that: The valve core assembly (202) comprises a valve core main body (2021) and a valve core sleeve (2022); the upper end of the valve core main body (2021) extends out of the valve core assembly (201) and is fixedly connected to the valve core sleeve (2022); the upper end portion comprises the valve core sleeve (2022), and the valve core sleeve (2022) comprises the first valve core abutment portion (202b).

7. The electric valve according to any one of claims 1 to 4, characterized in that: The valve core assembly (202) includes a lower end portion located below the valve shaft assembly (201), the second elastic member (204) is sleeved on the lower end portion, and 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 surface of the valve shaft assembly (201) forms a fourth valve shaft abutment portion (201j), and the upper end portion 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 to 4, characterized in that: The valve shaft assembly (201) includes a valve shaft (2011) and a bushing (2012), wherein the valve shaft (2011) and the bushing (2012) are hollow structures, 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 portion of the bushing (2012) forms the first valve shaft abutment portion (201g), and the bushing (2012) is fixedly connected to the valve shaft. 012) forms a second valve shaft abutment portion (201h), the upper end portion 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 surface of the valve shaft (2011) forms a fourth valve shaft abutment portion (201j), and the upper end portion 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 to 4, characterized in that: The electric valve further comprises a third elastic member (205) and a housing (30), wherein the third elastic member (205) is sheathed on the upper end portion. When the third elastic member (205) abuts against the housing (30), the first valve core abutting portion (202b) abuts against the first valve shaft abutting portion (201g), and the gasket component (206) abuts against the third valve shaft abutting portion (201i) and does not abut against the second valve core abutting portion (202c).

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