Segmented adjustment mechanism for opening degree of electromagnetic valve

Abstract

A segmented adjustment mechanism for the opening degree of an electromagnetic valve, comprising: a valve seat, wherein a valve core used for opening and closing a valve is provided in the valve seat; an electromagnetic driving assembly built in the valve seat and located above the valve core, the electromagnetic driving assembly comprising a movable member capable of moving up and down, wherein a first abutting part and a second abutting part which are located at different heights are provided on the movable member, and the first abutting part is located below the second abutting part; and an elastic assembly comprising a first elastic member and a second elastic member, wherein the first elastic member is elastically supported on the lower end face of the valve core, the second elastic member is located above the valve core, an opening allowing the first abutting part to pass through is formed in the second elastic member. When the movable member moves towards the valve core, the first abutting part can pass through the second elastic member and abut against the valve core; and the second abutting part can abut against the second elastic member along with continuous movement of the movable member. The segmented control for the opening degree of the movable member is achieved, thereby improving the flow control precision.

Description

Solenoid valve opening segment adjustment mechanism Technical Field

[0001] The present invention relates to the technical field of solenoid valve flow control, in particular to a solenoid valve opening segmented adjustment mechanism. Background Art

[0002] Solenoid valves are essential components for controlling fluid flow. A motor powers the electromagnetic coil, causing the moving core to electromagnetically move the valve core, thereby controlling the flow rate. However, in existing solenoid valves, the valve core's opening is typically controlled by a single spring. This results in a relatively uniform change in the valve core's opening, making precise flow control difficult. Furthermore, relying solely on a single spring for control requires high spring consistency during production, further increasing the complexity of the process. Summary of the Invention

[0003] In order to overcome the above shortcomings, the purpose of the present invention is to provide a solenoid valve opening segmented adjustment mechanism, which on the one hand realizes segmented control of the opening of the movable part to improve the control accuracy of the flow rate, and on the other hand reduces the consistency requirements of the spring through segmented control.

[0004] In order to achieve the above objectives, the present invention proposes a solenoid valve opening segment adjustment mechanism, comprising

[0005] A valve seat, wherein a valve core for opening and closing the valve is provided in the valve seat;

[0006] an electromagnetic drive assembly, built into the valve seat and located above the valve core; the electromagnetic drive assembly includes a movable member that can move up and down under the action of the electromagnetic drive unit, the movable member being provided with a first push portion and a second push portion located at different heights, with the first push portion being located below the second push portion;

[0007] The elastic component includes a first elastic member and a second elastic member; the second elastic member is located above the valve core and is provided with an opening for the first push portion to pass through;

[0008] When the movable member moves toward the valve core, the first pushing portion can pass through the second elastic member and push against the valve core; as the movable member continues to move, the second pushing portion can push against the second elastic member.

[0009] According to the present invention, when the movable member moves toward the valve core (i.e., downwardly), the first resisting portion first passes through the second elastic member and resists the valve core (the second elastic member and the movable member do not contact each other), causing the valve core to move downward. At this time, because the first elastic member elastically supports the valve core, the first elastic member is compressed and can generate an upward reaction force F1 on the movable member through the valve core. As the movable member continues to move downward, the second resisting portion moves downward until it resists the second elastic member. The second elastic member is then compressed and can generate an upward reaction force F2 on the movable member. At this time, the movable member is simultaneously subjected to the reaction forces F1 and F2 of the first and second elastic members. That is, in the entire process of the electromagnetic drive part driving the movable part to move toward the valve core, when the movable part moves in the first stage (the second push part is not in contact with the second elastic part), it only needs to overcome the reaction force F1 applied by the first elastic part; when the movable part moves in the second stage (the second push part is in contact with the second elastic part), it needs to overcome the reaction forces F1 and F2 applied by the first elastic part and the second elastic part at the same time.

[0010] Because the movable part must overcome different reaction forces in the first and second stages, it requires different electromagnetic driving forces from the electromagnetic drive unit. Using different electromagnetic driving forces to overcome different reaction forces and drive the movable part to move enables segmented control of the movable part's opening. Different openings produce different flow rates, thereby improving flow control accuracy. Furthermore, in the second stage, the first and second elastic parts can simultaneously apply reaction forces, reducing the requirement for consistent processing of a single elastic part.

[0011] Specifically, the movable member includes a push rod, which includes a first abutting portion and a second abutting portion, wherein the outer diameter of the second abutting portion is larger than the outer diameter of the first abutting portion. The structural constraints of the first and second abutting portions facilitate the coordinated movement of the push rod with the second elastic member during downward movement. Furthermore, the travel of the first stage can be adjusted by adjusting the vertical length of the first abutting portion.

[0012] Furthermore, a guide round head is provided at one end of the first pushing portion facing the valve core to facilitate the first pushing portion to pass through the opening.

[0013] Specifically, the second elastic member comprises a spring sheet having the opening defined in its middle. The opening has an inner diameter greater than the outer diameter of the first abutting portion and smaller than the outer diameter of the second abutting portion. When the push rod moves toward the second elastic member, the first abutting portion can pass through the opening because the inner diameter of the opening is greater than the outer diameter of the first abutting portion. Furthermore, the second abutting portion can abut against the spring sheet because the inner diameter of the opening is smaller than the outer diameter of the second abutting portion.

[0014] Furthermore, the spring piece includes a connecting ring and a fixing ring which are arranged radially from the inside to the outside, the fixing ring is pressed into the valve seat, and the connecting ring is provided with the opening. The connecting ring and the fixing ring are connected by at least one elastic arm. When the second pushing portion pushes against the connecting ring of the spring piece, since the fixing ring is pressed into the valve seat, the position of the fixing ring is relatively fixed. As the second pushing portion continues to move downward, the connecting ring moves downward and can drive the elastic arm to stretch and deform. Exemplarily, there may be 3, 4, 5, 6, etc. elastic arms. Furthermore, the fixing ring may be a closed-loop structure or an open-loop structure. When an open-loop structure is adopted, the fixing ring includes a plurality of arc-shaped pieces arranged in a one-to-one correspondence with the elastic arms, with a spacing between two adjacent arc-shaped pieces, and the arc-shaped pieces are connected to the corresponding elastic arms.

[0015] Specifically, the spring clip includes a connecting ring with the opening, and a plurality of radially distributed spring arms are connected to the outer wall of the connecting ring. The ends of the spring arms, distal to the connecting ring, are press-fitted against the valve seat. This spring clip structure directly presses the ends of the spring arms against the valve seat, eliminating the need for a retaining ring. Furthermore, the ends of the spring arms, distal to the connecting ring, are thickened to increase the contact area between the spring arms and the valve seat.

[0016] Furthermore, the spring piece includes a fixing ring pressed into the valve seat, and the inner wall of the fixing ring is evenly distributed with a number of spring arms distributed in a circular array and extending toward the center of the circle. The side of the several spring arms extending toward the center of the fixing ring together forms the opening.

[0017] Furthermore, the movable part further comprises a movable iron core, and one end of the second push portion away from the first push portion is integrally provided with a push rod connecting portion fixedly connected to the movable iron core. The movable iron core is provided to cooperate with the magnetic attraction of the electromagnetic drive portion.

[0018] Furthermore, the movable iron core and the push rod connecting portion are fixedly connected by crimping, welding or integral molding.

[0019] Furthermore, the first elastic member is elastically supported on the lower end surface of the valve core, and includes a spring sleeved on the valve core, with two ends of the spring respectively abutting against the valve core and the valve seat.

[0020] Furthermore, the valve seat includes a seat body, which is provided with a partition plate for dividing its interior into an upper chamber and a lower chamber. The upper chamber is used to accommodate the electromagnetic drive component, and the lower chamber is used to accommodate the elastic component and the valve core; the partition plate is also provided with a push rod channel for the push rod to pass through.

[0021] Furthermore, the electromagnetic driving part includes an electromagnetic coil and a fixed iron core, and the fixed iron core is located on a side of the movable part away from the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a cross-sectional schematic diagram of a solenoid valve opening adjustment mechanism according to an embodiment of the present invention;

[0023] FIG2 is a partial enlarged view of portion A in FIG1 ;

[0024] FIG3 is a schematic cross-sectional view of a movable member according to an embodiment of the present invention;

[0025] FIG4 is a schematic structural diagram of a push rod according to an embodiment of the present invention;

[0026] FIG5 is a schematic diagram of a variant of a push rod according to an embodiment of the present invention;

[0027] FIG6 is a schematic diagram of another variant of the push rod according to the embodiment of the present invention;

[0028] FIG7 is a schematic diagram of another variant of the push rod according to an embodiment of the present invention;

[0029] FIG8 is a schematic structural diagram of a second elastic member according to an embodiment of the present invention;

[0030] FIG9 is a schematic diagram of a variation of the spring element according to an embodiment of the present invention;

[0031] FIG10 is a schematic diagram of another variation of the spring element according to the embodiment of the present invention;

[0032] FIG11 is a schematic diagram of another variation of the spring element according to the embodiment of the present invention;

[0033] FIG12 is a schematic diagram of another variation of the spring element according to the embodiment of the present invention;

[0034] FIG13 is a schematic cross-sectional view of a seat body according to an embodiment of the present invention.

[0035] In the picture:

[0036] 1-valve seat; 11-upper chamber; 12-lower chamber; 13-partition plate; 131-push rod channel;

[0037] 2-valve core;

[0038] 3-Electromagnetic drive unit;

[0039] 4- movable part; 41- first push part; 411- guide round head; 42- second push part; 421- push rod connecting part; 43- movable iron core; 431- embedded groove; 44- reinforcement part; 45- limit part;

[0040] 51 - first elastic member; 52 - second elastic member; 521 - opening; 522 - connecting ring; 523 - fixing ring; 5231 - arc-shaped piece; 524 - elastic arm. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0042] It should be noted that all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the present invention, terms such as "upper," "lower," "top," "bottom," "length," "width," and "thickness" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These terms are used solely for ease of description and do not indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, terms such as "set", "provided with", "installed", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through other components; it can be a mechanical connection or an electrical connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, the drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0045] Furthermore, references to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of such phrases in various locations in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] Example

[0047] Referring to Figures 1-3 , the solenoid valve opening adjustment mechanism of the present invention includes a valve seat 1, an electromagnetic drive assembly, and an elastic assembly. The valve seat 1 is provided with a valve core 2 for opening and closing the valve. The electromagnetic drive assembly is built into the valve seat 1 and located above the valve core 2. It includes a movable member 4 that can move up and down under the action of the electromagnetic drive unit 3. The movable member 4 is provided with a first push portion 41 and a second push portion 42 located at different heights, with the first push portion 41 located below the second push portion 42. The elastic assembly includes a first elastic member 51 and a second elastic member 52. The first elastic member 51 is elastically supported on the lower end surface of the valve core 2. The second elastic member 52 is located above the valve core 2 and is provided with an opening 521 for the first push portion 41 to pass through.

[0048] When the movable member 4 moves toward the valve core 2 (i.e., downward), the first abutting portion 41 first passes through the second elastic member 52 and abuts the valve core 2 (during this process, the second elastic member 52 and the movable member 4 do not contact each other), causing the valve core 2 to move downward. At this time, because the first elastic member 51 elastically supports the valve core 2, the first elastic member 51 is compressed and, through the valve core 2, generates an upward reaction force F1 on the movable member 4. Subsequently, under the action of the electromagnetic drive unit 3, the movable member 4 overcomes the reaction force F1 and continues to move downward until the second abutting portion 42 moves downward and abuts the second elastic member 52. The second elastic member 52 is then compressed and generates an upward reaction force F2 on the movable member 4. At this time, the movable member 4 is simultaneously subjected to the reaction forces F1 and F2 of the first elastic member 51 and the second elastic member 52. Subsequently, under the action of the electromagnetic drive unit 3, the movable member 4 overcomes both the reaction forces F1 and F2 and continues to move downward. That is, in the entire process of the electromagnetic drive unit 3 driving the movable part 4 to move in the direction of the valve core 2, when the movable part 4 moves in the first stage (the second push part 42 is not in contact with the second elastic part 52), the electromagnetic driving force applied by the electromagnetic drive unit 3 to the movable part 4 only needs to overcome the reaction force F1 applied by the first elastic part 51 to control the opening of the movable part 4; and when the movable part 4 moves in the second stage (the second push part 42 is in contact with the second elastic part 52), the electromagnetic driving force applied by the electromagnetic drive unit 3 to the movable part 4 needs to overcome the reaction forces F1 and F2 applied by the first elastic part 51 and the second elastic part 52 at the same time, and then control the opening of the movable part 4.

[0049] Compared with the prior art, the present application adds a second elastic member 52 and adjusts the structure of the movable member 4. During the entire process of the movable member 4 moving downward, the electromagnetic drive unit 3 drives the movable member 4 in two stages. In the first stage, the movable member 4 has no contact with the second elastic member 52, and the movable member 4 is only subjected to the reaction force F1 applied by the first elastic member 51; in the second stage, the first push portion 41 of the movable member 4 abuts against the valve core 2, and the second push portion 42 of the movable member 4 abuts against the second elastic member, and the movable member 4 is simultaneously subjected to the reaction force F1 applied by the first elastic member 51 and the reaction force F2 applied by the second elastic member 52. During these two stages, the electromagnetic driving force applied by the electromagnetic drive unit 3 to the movable member 4 is different. By overcoming the reaction forces at different stages and controlling the movement of the movable member 4 with different electromagnetic driving forces, the movable member 4 can be controlled in stages. Different openings generate different flow rates, thereby improving the solenoid valve's flow control accuracy. It also enables precise control of the specific positions of the movable member 4 and valve core 2, facilitating flow control at specific locations. Furthermore, during the second stage, the first and second elastic members 51, 52 can simultaneously apply reaction forces to the movable member 4, thereby reducing the requirements for consistent processing of a single elastic member.

[0050] In actual application, the magnitude of the reaction forces F1 and F2 can be adjusted by adjusting the stiffness of the first elastic member 51 and the second elastic member 52; the length of the stroke of the first stage (that is, the stroke controlled by the reaction force F1 alone) and the length of the stroke of the second stage (that is, the stroke controlled by the reaction forces F1 and F2 together) can be adjusted by adjusting the height of the first push portion 41 and the second push portion 42.

[0051] In some embodiments, as shown in Figures 3-5, the movable part 4 includes a push rod, and the push rod includes a first push portion 41 and a second push portion 42 that are integrally formed and coaxially arranged, and the outer diameter of the second push portion 42 is larger than the outer diameter of the first push portion 41. Exemplarily, the push rod is a stepped cylindrical structure, the first push portion 41 is a small cylindrical structure, and the second push portion 42 is a large cylindrical structure. By limiting the structures of the first push portion 41 and the second push portion 42, the purpose of allowing the first push portion 41 to pass through the opening 521 and the second push portion 42 not to pass through the opening 521 can be achieved, so as to cooperate with the action of the second elastic member 52. Furthermore, in order to facilitate the first push portion 41 to pass through the opening 521, as shown in Figure 3, a guide round head 411 is provided at one end of the first push portion 41 facing the valve core 2, and the guide round head 411 can adopt a truncated cone structure or a hemispherical structure.

[0052] It should be noted that the shape of the push rod is not limited, and shapes such as square, oval, triangle, etc. can be selected according to actual needs. When other non-circular structures such as square, oval, triangle, etc. are selected, the outer diameter of the first push part 41 and the second push part 42 is the maximum size of the first push part and the second push part along the direction perpendicular to the movement of the push rod.

[0053] In some embodiments, as shown in Figures 2-4, the movable member 4 further includes a movable iron core 43. A push rod connecting portion 421 is integrally provided at one end of the second push portion 42 of the push rod, distal from the first push portion 41, and is fixedly connected to the movable iron core 43. The cross-sectional area of ​​the push rod connecting portion 421 is greater than the cross-sectional area of ​​the second push portion 42. For example, the cross-sectional area of ​​the push rod connecting portion 421 is elliptical, while the cross-sectional area of ​​the second push portion 42 is circular. Furthermore, a recess 431 is defined at the lower end of the movable iron core 43. The push rod connecting portion 421 is embedded in the recess 431 and is fixedly secured thereto by crimping, welding, or integral molding. When the electromagnetic drive unit 3 drives the movable member 4 to move, a material capable of magnetic attraction is required. Therefore, when the movable member 4 further includes the movable iron core 43, the movable iron core 43 only needs to be made of a magnetically attractive iron material, while the push rod can be made of other non-magnetic materials.

[0054] In some embodiments, the push rod may also adopt other modified structures. For example, referring to FIG6 , a reinforcing portion 44 coaxially arranged with the second pushing portion 42 is provided between the push rod connecting portion 421 and the second pushing portion 42, and the outer diameter of the reinforcing portion 44 is larger than the outer diameter of the second pushing portion 42. For another example, referring to FIG7 , a limiting portion 45 is coaxially provided at one end of the first pushing portion 41 away from the second pushing portion 42, and the outer diameter of the limiting portion 45 is larger than the outer diameter of the first pushing portion 41 and smaller than the inner diameter of the opening 521. During assembly, the push rod is inserted into the opening 521, and the first pushing portion 41 is located in the opening 521. At this time, the second pushing portion 42 and the limiting portion 45 are respectively located on both sides of the opening 521. The setting of the limiting portion 521 can limit the moving path of the second pushing portion.

[0055] In some embodiments, as shown in Figures 1-2 , the first elastic member 51 comprises a spring vertically mounted on the valve core 2, with its ends respectively contacting the valve core 2 and the valve seat 1. When the movable member 4 pushes the valve core 2 downward, the spring becomes compressed because the position of the valve seat 1 remains unchanged. It should be noted that the first elastic member 51 may alternatively employ other elastic structures capable of contacting the valve core 2 and the valve seat 1, as long as they are capable of elastic deformation.

[0056] In some embodiments, as shown in Figures 2 and 8 , the second elastic member 52 comprises a spring plate having an opening 521 defined in its center. The inner diameter of the opening 521 is greater than the outer diameter of the first abutting portion 41 and smaller than the outer diameter of the second abutting portion 42. When the push rod moves toward the second elastic member 52, the first abutting portion 41 can pass through the opening 521 because the inner diameter of the opening 521 is greater than the outer diameter of the first abutting portion 41. However, the second abutting portion 42 cannot pass through the opening 521 because the inner diameter of the opening 521 is smaller than the outer diameter of the second abutting portion 42, and thus directly abuts against the spring plate.

[0057] Furthermore, as shown in FIG8 , the spring piece includes a connecting ring 522 and a fixing ring 523, which are arranged radially from the inside outward. The fixing ring 523 is crimped into the valve seat 1 . The connecting ring 522 has an opening 521 through which the first push portion 41 passes. The connecting ring 522 and the fixing ring 523 are connected by at least one elastic arm 524. For example, as shown in FIG8 and 9 , the number of elastic arms is not limited and may be three, four, five, or six, for example.

[0058] When the push rod moves downward, the first pushing portion 41 can pass through the opening 521 until the second pushing portion 42 pushes on the connecting ring 522 of the spring sheet. At this time, since the fixing ring 523 is pressed into the valve seat 1, the position of the fixing ring 523 is relatively fixed. As the second pushing portion 42 continues to move downward, the connecting ring 522 moves downward and can drive the elastic arm 524 to stretch and deform.

[0059] Furthermore, the elastic arms 524 are S-shaped, with their ends fixedly connected to the outer wall of the connecting ring 522 and the inner wall of the fixing ring 523, respectively. The S-shaped design of the elastic arms 524 enhances their deformability to a certain extent. For example, three elastic arms 524 are evenly spaced between the connecting ring 522 and the fixing ring 523.

[0060] It should be noted that the structure of the spring piece can be further changed according to actual needs. For example, the fixing ring 523 can be designed as an open-loop structure. Specifically, as shown in Figure 10, the fixing ring 523 includes a plurality of arc-shaped pieces 5231 arranged in a one-to-one correspondence with the elastic arms 524, with a gap between two adjacent arc-shaped pieces 5231, and the arc-shaped pieces 5231 are connected to the corresponding elastic arms 524. During installation, the arc-shaped pieces 5231 are pressed into the valve seat 1 in sequence, and the pressure-connection of the plurality of arc-shaped pieces 5231 by the valve seat 1 can ensure the stability of the positions of the plurality of arc-shaped pieces 5231.

[0061] For example, in some embodiments, as shown in FIG11 , the spring clip includes a connecting ring 522 with an opening 521. The outer wall of the connecting ring 522 is connected to a plurality of radially distributed spring arms 524. The ends of the spring arms 524, distal to the connecting ring 522, are crimped onto the valve seat 1. This spring clip structure directly crimps the ends of the spring arms 524 onto the valve seat 1, eliminating the structural features of the retaining ring 523 and simplifying the spring clip structure. Furthermore, the ends of the spring arms 524, distal to the connecting ring 522, are thickened to increase the crimping area between the spring arms 524 and the valve seat 1.

[0062] For example, in some embodiments, as shown in FIG12 , the spring piece includes a fixed ring 523 that is pressed into the valve seat 1. The inner side wall of the fixed ring 523 is evenly distributed with a plurality of elastic arms 524 distributed in a circular array and extending toward the center of the circle. The sides of the plurality of elastic arms 524 extending toward the center of the fixed ring together form an opening 521. The spring piece of this structure directly uses the gaps between the plurality of elastic arms 524 as the opening 521, thereby eliminating the structural features of the connecting ring 522. In this structure, the second push portion 42 directly pushes against the elastic arm 524. Furthermore, the end of the elastic arm 524 forming the opening 521 is thickened.

[0063] In some embodiments, as shown in Figures 1 and 13 , a valve seat 1 includes a seat body, which is provided with a partition plate 13 for dividing the interior of the seat into an upper chamber 11 and a lower chamber 12. The upper chamber 11 is used to accommodate the electromagnetic drive assembly, and the lower chamber 12 is used to accommodate the elastic assembly and the valve core 2. The partition plate 13 is also provided with a push rod passage 131 for the push rod to pass through.

[0064] It should be noted that when the spring is in a natural state, the lower end surfaces of the spring arm 524 and the connecting ring 522 do not contact the valve core 2 , and the upper end surfaces of the spring arm 524 and the connecting ring 522 do not contact the partition plate 13 .

[0065] In some embodiments, the electromagnetic drive unit 3 includes an electromagnetic coil and a fixed iron core, which is located on the side of the movable member 4 away from the valve core 2. Applying electromagnetic driving force to the movable member 4 through the electromagnetic coil is a conventional technique in the art and is not described in detail in this embodiment.

[0066] The above embodiments are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A solenoid valve opening segmented adjustment mechanism, characterized in that: Comprising a valve seat, within which a valve core for opening and closing a valve is provided; an electromagnetic driving assembly, built within the valve seat and located above the valve core; the electromagnetic driving assembly includes a movable member that can move up and down under the action of an electromagnetic driving part, and a first pushing part and a second pushing part at different heights are provided on the movable member, and the first pushing part is located below the second pushing part; an elastic assembly, including a first elastic member and a second elastic member; the second elastic member is located above the valve core, and an opening is formed thereon for the first pushing part to pass through; When the movable member moves towards the valve core, the first pushing part can pass through the second elastic member and push against the valve core; as the movable member continues to move, the second pushing part can push against the second elastic member.

2. The solenoid valve opening degree segmented adjustment mechanism according to claim 1, wherein: The movable member includes a push rod, the push rod includes the first pushing part and the second pushing part, and the outer diameter of the second pushing part is larger than the outer diameter of the first pushing part.

3. The solenoid valve opening degree segmented adjustment mechanism according to claim 2, characterized in that: A guiding round head is provided at one end of the first pushing part facing the valve core.

4. The solenoid valve opening degree segmented adjustment mechanism according to claim 2, wherein: The second elastic member includes a spring piece, an opening is formed in the middle of the spring piece, and the inner diameter of the opening is larger than the outer diameter of the first pushing part and smaller than the outer diameter of the second pushing part.

5. The solenoid valve opening degree segmented adjustment mechanism according to claim 4, characterized in that: The spring piece includes a connecting ring and a fixing ring arranged radially from the inside outwards, the fixing ring is press-fitted within the valve seat, and the opening is formed on the connecting ring; the connecting ring and the fixing ring are connected by at least one elastic arm.

6. The solenoid valve opening degree segmented adjustment mechanism according to claim 4, wherein: The spring piece includes a connecting ring with the opening formed thereon, and a plurality of radially distributed elastic arms are connected to the outer side wall of the connecting ring, and one ends of the plurality of elastic arms away from the connecting ring are press-fitted on the valve seat.

7. The solenoid valve opening degree segmented adjustment mechanism according to claim 4, characterized in that: The spring piece includes a fixing ring press-fitted within the valve seat, and a plurality of circumferentially arrayed elastic arms extending towards the center of the circle are evenly distributed on the inner side wall of the fixing ring, and the opening is jointly formed by one sides of the plurality of elastic arms extending towards the center of the fixing ring.

8. The solenoid valve opening degree segmented adjustment mechanism according to claim 2, characterized in that: The movable member further includes a movable iron core, and a push rod connecting part fixedly connected to the movable iron core is integrally provided at one end of the second pushing part away from the first pushing part.

9. The solenoid valve opening degree segmented adjustment mechanism according to claim 8, characterized in that: The movable iron core and the push rod connecting part are fixedly connected by means of press-fitting, welding or integral molding.

10. The electromagnetic valve opening degree segmented adjustment mechanism according to claim 1, wherein: The first elastic member is elastically supported on the lower end surface of the valve core, and it includes a spring sleeved on the valve core, and two ends of the spring respectively abut against the valve core and the valve seat.

11. The solenoid valve opening degree segmented adjustment mechanism according to claim 2, characterized in that: The valve seat includes a seat body, a partition plate for dividing its interior into an upper cavity and a lower cavity is provided within the seat body, the upper cavity is used to accommodate the electromagnetic driving assembly, and the lower cavity is used to accommodate the elastic assembly and the valve core; a push rod passage for the push rod to pass through is further provided on the partition plate.

12. The solenoid valve opening degree segmented adjustment mechanism according to claim 1, wherein: The electromagnetic driving part includes an electromagnetic coil and a fixed iron core, and the fixed iron core is located on the side of the movable member away from the valve core.

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