Drive assembly for a solenoid valve and solenoid valve

Abstract

The application discloses a driving assembly for an electromagnetic valve and the electromagnetic valve, the driving assembly for the electromagnetic valve comprises a static core, a dynamic core, the dynamic core is located on one side of the static core in the axial direction and is movable along the axial direction of the static core, the two ends of the dynamic core and the static core towards each other are respectively a first matching part and a second matching part, a matching groove is arranged on the end face of the first matching part close to the second matching part, and the second matching part is adapted to extend into the matching groove, and the diameter of the end of the second matching part close to the first matching part is at least the same as the hole diameter of the end of the matching groove close to the second matching part; a coil is sleeved outside the static core and the dynamic core and is used for driving the dynamic core to move along the axial direction of the static core. According to the driving assembly of the embodiment of the application, the electromagnetic force between the dynamic core and the static core can be improved, the magnetic flux leakage can be prevented, the driving of the dynamic core can be ensured to be reliable, the energy efficiency ratio can be improved, and the production cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and more specifically, to a drive assembly for a solenoid valve and a solenoid valve. Background Technology

[0002] In related technologies, during the process of the moving iron core moving from the initial position to the mating position, at the initial position, due to the large air gap between the moving iron core and the stationary iron core, the magnetic force exerted on the moving iron core by the stationary iron core is small. A larger electromagnetic head is required to achieve the attraction between the moving iron core and the stationary iron core, which increases the production cost. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a drive assembly for a solenoid valve, which can improve the electromagnetic force between the moving iron core and the stationary iron core, prevent magnetic leakage, ensure reliable driving of the moving iron core, improve energy efficiency ratio, and reduce production costs.

[0004] Another object of the present invention is to provide a solenoid valve having the above-described drive components.

[0005] According to an embodiment of the present invention, a drive assembly for a solenoid valve includes: a stationary iron core; a moving iron core, the moving iron core being located on one side of the axial direction of the stationary iron core and movable along the axial direction of the stationary iron core, the moving iron core and the stationary iron core having a first mating portion and a second mating portion facing each other at their respective ends, the end face of the first mating portion near the second mating portion having a mating groove, and the second mating portion being adapted to extend into the mating groove, the diameter of the end of the second mating portion near the first mating portion being at least the same as the aperture of the end of the mating groove near the second mating portion; and a coil, the coil being sleeved on the stationary iron core and the moving iron core, for driving the moving iron core to move along the axial direction of the stationary iron core.

[0006] According to an embodiment of the present invention, a drive assembly for a solenoid valve comprises a movable iron core located on one side of the stationary iron core along the axial direction of the stationary iron core. The movable and stationary iron cores have a first mating portion and a second mating portion at their respective ends facing each other. A mating groove is provided on the end face of the first mating portion near the second mating portion, and the second mating portion is adapted to extend into the mating groove of the movable iron core. The diameter of the end of the second mating portion near the first mating portion is at least the same as the aperture of the mating groove near the second mating portion. A coil is sleeved around the stationary and movable iron cores to drive the movable iron core to move along the axial direction of the stationary iron core. During the movement from the initial position to the mating position, the electromagnetic force between the moving iron core and the stationary iron core can be increased, resulting in an electromagnetic force higher than that of solenoid valves with "planar attraction" in related technologies. This avoids the need for a larger solenoid head, enabling miniaturization of the solenoid valve and reducing costs. Furthermore, the end of the second mating part near the first mating part can seal the end of the mating groove near the second mating part, preventing large magnetic resistance caused by air gaps, thus avoiding large air gaps, preventing magnetic leakage, maintaining the required electromagnetic force, ensuring reliable driving of the moving iron core, improving the energy efficiency ratio, and thereby reducing the size of the coil and helping to reduce production costs.

[0007] In addition, the drive assembly for the solenoid valve according to the above embodiments of the present invention may also have the following additional technical features: According to some embodiments of the present invention, in a drive assembly for a solenoid valve, the distance between the outer peripheral wall of the first mating portion and the groove sidewall of the mating groove is L1, and at least a portion of the sidewall of the mating groove has a thickness less than L1.

[0008] According to some embodiments of the present invention, a first groove is provided on the outer peripheral wall of the first mating part, and at least a portion of the first groove is opposite to the mating groove along the axial direction of the moving iron core, and the first groove extends along the circumferential direction of the first mating part; and / or, a second groove is provided on the groove sidewall of the mating groove, and the second groove extends along the circumferential direction of the first mating part.

[0009] According to some embodiments of the present invention, the cross-sectional area of ​​the sidewall of the mating groove gradually decreases along the direction from the first mating portion to the second mating portion.

[0010] According to some embodiments of the present invention, the outer peripheral wall of the first mating part has an inclined surface, and in the direction from the first mating part to the second mating part, the inclined surface extends inclinedly toward the central axis of the moving iron core.

[0011] According to some embodiments of the present invention, the second mating part is provided with a third groove, the distance between the outer peripheral wall of the second mating part and the groove sidewall of the third groove is L2, and at least a portion of the sidewall of the third groove has a thickness less than L2.

[0012] According to some embodiments of the present invention, a fourth groove is provided on the outer peripheral wall of the second mating part, and at least a portion of the fourth groove is opposite to the third groove along the axial direction of the moving iron core, and the fourth groove extends along the circumferential direction of the second mating part; and / or, a fifth groove is provided on the groove sidewall of the third groove, and the fifth groove extends along the circumferential direction of the second mating part; and / or, along the direction from the second mating part to the first mating part, the cross-sectional area of ​​the sidewall of the third groove gradually decreases.

[0013] According to some embodiments of the present invention, the moving iron core has an initial position and a mating position along the axial direction of the stationary iron core. In the initial position, the second mating part and the first mating part are spaced apart, or the second mating part is flush with or partially overlaps with one end of the mating groove near the second mating part. In the mating position, the end of the second mating part near the first mating part abuts against the bottom wall of the mating groove.

[0014] According to some embodiments of the present invention, the end face of the second mating part near the mating groove is formed as a plane; and / or, the cross-sectional area of ​​at least the portion of the second mating part extending into the mating groove remains unchanged; and / or, the driving assembly further includes an elastic element disposed between the stationary iron core and the moving iron core for constantly driving the moving iron core to move toward a side away from the stationary iron core.

[0015] The solenoid valve according to an embodiment of the present invention includes the drive assembly for the solenoid valve described in the embodiment of the present invention.

[0016] According to an embodiment of the solenoid valve, a moving iron core is located on one side of the stationary iron core along the axial direction and is movable along the axial direction of the stationary iron core. The moving and stationary iron cores have a first mating portion and a second mating portion at their respective ends facing each other. A mating groove is provided on the end face of the first mating portion near the second mating portion, and the second mating portion is adapted to extend into the mating groove of the moving iron core. The diameter of the end of the second mating portion near the first mating portion is at least the same as the aperture of the mating groove near the second mating portion. A coil is sleeved around the stationary and moving iron cores to drive the moving iron core to move along the axial direction of the stationary iron core. When the moving iron core moves from its initial position... During the process of moving to the mating position, the electromagnetic force between the moving iron core and the stationary iron core can be increased, which is higher than that of the "planar attraction" solenoid valve in related technologies. This avoids the need for a larger solenoid head, enabling the miniaturization of the solenoid valve and reducing costs. Furthermore, the end of the second mating part near the first mating part can seal the end of the mating groove near the second mating part, preventing the generation of large magnetic resistance through air, thereby avoiding the generation of large air gaps, preventing magnetic leakage, maintaining the required electromagnetic force, ensuring reliable driving of the moving iron core, improving the energy efficiency ratio, and thus reducing the size of the coil, which is beneficial to reducing production costs.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the solenoid valve according to the first embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the stationary iron core and the moving iron core in cooperation according to the first embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a solenoid valve according to a second embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a solenoid valve according to a third embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a solenoid valve according to the fourth embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a solenoid valve according to the fifth embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a solenoid valve according to the sixth embodiment of the present invention; Figure 8 This is a comparison diagram of the electromagnetic force characteristics between the moving iron core and the stationary iron core according to the first embodiment, the fifth embodiment and related technologies of the present invention.

[0019] Figure label: 100. Drive assembly; 200. Solenoid valve; 10. Stationary iron core; 11. Central boss; 20. Moving iron core; 21. Fitting groove; 22. First groove; 23. Second groove; 24. Inclined surface; 25. Third groove; 30. Coil; 40. Elastic components; 51. Magnetic guide frame; 52. Valve needle; 53. Piston; 54. Inlet; 55. Outlet; 56. Valve body; 531. Connecting port; 561. Valve chamber. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this invention, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "above," "over," and "on top" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0023] The following description, with reference to the accompanying drawings, describes a drive assembly 100 for a solenoid valve 200 according to an embodiment of the present invention.

[0024] Reference Figures 1-7 As shown, the drive assembly 100 for the solenoid valve 200 according to an embodiment of the present invention may include: a stationary iron core 10, a moving iron core 20, and a coil 30.

[0025] Specifically, the moving iron core 20 is located on one side of the stationary iron core 10 along its axial direction (e.g., Figure 1 (as shown below), and the moving iron core 20 is along the axial direction of the stationary iron core 10 (e.g., the lower side), and the moving iron core 20 is along the axial direction of the stationary iron core 10. Figure 1 The moving iron core 20 and the stationary iron core 10 are movable in the up-down direction shown. The two ends of the moving iron core 20 and the stationary iron core 10 facing each other are respectively the first mating part and the second mating part. That is, the end of the moving iron core 20 facing the stationary iron core 10 is the first mating part, and the end of the stationary iron core 10 facing the moving iron core 20 is the second mating part; or the end of the moving iron core 20 facing the stationary iron core 10 is the second mating part, and the end of the stationary iron core 10 facing the moving iron core 20 is the first mating part.

[0026] The end face of the first mating part near the second mating part (e.g.) Figure 1 The upper end face shown is provided with a mating groove 21, and the second mating part can extend into the mating groove 21. The coil 30 is sleeved on the outside of the stationary iron core 10 and the moving iron core 20. The coil 30 can drive the moving iron core 20 to move along the axial direction of the stationary iron core 10. The stationary iron core 10, the moving iron core 20 and the coil 30 can form a magnetic circuit loop to realize the driving requirement of the moving iron core 20. In the process of the moving iron core 20 moving from the initial position to the mating position, the mating groove 21 can increase the electromagnetic force between the moving iron core 20 and the stationary iron core 10, which has a higher electromagnetic force than the "planar attraction" solenoid valve in the related technology. It can avoid the use of a larger solenoid head, realize the miniaturization of the solenoid valve 200 and reduce costs. For example, as Figure 8 As shown, when the GAP (air gap) is 3mm, the electromagnetic force of the solenoid valve 200 in this embodiment of the invention is higher than that of the solenoid valve with planar attraction in the related art.

[0027] For example, when the coil 30 is energized, a magnetic field is generated, and an electromagnetic force is generated between the stationary iron core 10 and the moving iron core 20, attracting the moving iron core 20 to move towards the stationary iron core 10. Thus, the moving iron core 20 can drive the valve core of the solenoid valve 200 to change the fluid passage and realize the control requirements of the solenoid valve 200.

[0028] It should be noted that, for ease of description, the directions such as "up" and "down" in this invention are based on the orientation relationships shown in the accompanying drawings, and are not a limitation on the orientation in actual application.

[0029] In related technologies, during the process of the moving iron core moving from the initial position to the mating position, the contact surface distance between the stationary iron core and the moving iron core is relatively large, which can easily lead to large magnetic leakage, affecting the attraction force and thus affecting the driving of the moving iron core.

[0030] Therefore, in this invention, as Figures 1-5 As shown, the end of the second mating part closest to the first mating part (e.g.) Figure 1The diameter of the lower end shown is at least the same as the end of the mating groove 21 near the second mating portion (e.g., Figure 1 The apertures of the upper part (shown in the diagram) are the same. Therefore, during the movement of the moving iron core 20 from its initial position to its mating position, the end of the second mating part near the first mating part seals the end of the mating groove 21 near the second mating part, forming a closed magnetic circuit between the moving iron core 20 and the stationary iron core 10. This concentrates the magnetic flux, avoids large magnetic resistance through air, and prevents large air gaps, effectively optimizing the magnetic circuit, preventing magnetic leakage, maintaining the required electromagnetic force, ensuring reliable driving of the moving iron core 20, improving the energy efficiency ratio, and thus reducing the size of the coil 30, which helps reduce production costs.

[0031] In some embodiments, such as Figure 1 , Figures 3-5 As shown, the drive assembly 100 also includes a magnetic guide frame 51. When the coil 30 is energized, the magnetic flux flowing through the stationary iron core 10 and the moving iron core 20 can flow through the magnetic guide frame 51 to form a closed magnetic circuit, thereby meeting the flow requirements of the magnetic flux circuit and ensuring reliable driving of the moving iron core 20.

[0032] According to an embodiment of the present invention, the driving assembly 100 has a moving iron core 20 located on one side of the stationary iron core 10 along the axial direction and movable along the axial direction of the stationary iron core 10. The moving iron core 20 and the stationary iron core 10 have a first mating part and a second mating part facing each other, respectively. The end face of the first mating part near the second mating part is provided with a mating groove 21, and the second mating part is adapted to extend into the mating groove 21 of the moving iron core 20. The diameter of the end of the second mating part near the first mating part is at least the same as the aperture of the end of the mating groove 21 near the second mating part. A coil 30 is sleeved on the stationary iron core 10 and the moving iron core 20 to drive the moving iron core 20 to move along the axial direction of the stationary iron core 10. During the process of the moving iron core 20 moving from the initial position to the mating position, the electromagnetic force between the moving iron core 20 and the stationary iron core 10 can be increased. It has a higher electromagnetic force than the "planar attraction" solenoid valve in related technologies. It can avoid the use of a larger solenoid head, realize the miniaturization of the solenoid valve 200, and reduce costs. Moreover, the end of the second mating part near the first mating part can seal the end of the mating groove 21 near the second mating part, avoiding the generation of large magnetic resistance through air, thereby avoiding the generation of large air gaps, preventing magnetic leakage, maintaining the required electromagnetic force, ensuring reliable driving of the moving iron core 20, improving the energy efficiency ratio, thereby reducing the size of the coil 30 and helping to reduce production costs.

[0033] In related technologies, electromagnetic force exhibits monotonicity, meaning it gradually increases as the air gap in the main magnetic circuit decreases. Consequently, at the moment the moving and stationary iron cores engage at high speed, their contact surfaces directly and rigidly collide, easily generating significant mechanical impact noise. For instance, when the moving and stationary iron cores are close to their mating position, the air gap is small, and the electromagnetic force rises rapidly, causing the moving and stationary iron cores to engage at high speed, resulting in a large rigid collision and thus significant mechanical impact noise.

[0034] Therefore, in some embodiments of the present invention, such as Figures 1-5 , Figure 7 As shown, the distance between the outer peripheral wall of the first mating part and the groove sidewall of the mating groove 21 is L1. At least a portion of the sidewall of the mating groove 21 has a thickness less than L1. Because this portion of the sidewall of the mating groove 21 has a thickness less than L1, this region forms a saturation region on the closed magnetic circuit of the stationary iron core 10 and the moving iron core 20. When the moving iron core 20 moves to the end of the stationary iron core 10 closest to the saturation region along the axial direction of the moving iron core 20, a preset non-zero air gap can be formed. Magnetic flux flowing through the saturation region is prone to saturation. It can block part of the magnetic flux, so that the magnetic flux force in the saturation region extends along the direction perpendicular to the movement direction of the moving iron core 20, that is, there is no force along the axis of the moving iron core 20. This can reduce the force on the moving iron core 20 along the axial direction of the moving iron core 20, reduce the attraction force, balance the initial attraction force, thereby reducing the attraction force between the moving iron core 20 and the stationary iron core 10 at the moment of high-speed attraction, reducing the impact acceleration, buffering the impact energy, reducing the large mechanical impact noise generated by rigid collision, significantly reducing working noise and vibration, and helping to extend the service life.

[0035] Therefore, by having at least a portion of the sidewall of the mating groove 21 with a thickness less than L1, when the air gap is neither too large nor too small, i.e. when the air gap is in the middle position, there is a large electromagnetic force between the moving iron core 20 and the stationary iron core 10; when the air gap is small, when the moving iron core 20 and the stationary iron core 10 are nearly fully engaged, the electromagnetic force between the moving iron core 20 and the stationary iron core 10 is smaller than the electromagnetic force of the solenoid valve with planar engagement and the solenoid valve 200 with only the mating groove 21 in the related art, which can reduce impact and noise.

[0036] The specific principle behind achieving the above effect by setting the mating groove 21 and ensuring that at least a portion of the sidewall of the mating groove 21 has a thickness less than L1 is as follows: When the moving iron core 20 moves from its initial position, the mating groove 21 plays a major role. The mating groove 21 can be a magnetic ring, which makes the magnetic path between the moving iron core 20 and the stationary iron core 10 shorter and the magnetic resistance smaller, resulting in a larger electromagnetic force between the moving iron core 20 and the stationary iron core 10.

[0037] When the moving iron core 20 moves toward the stationary iron core 10 and reaches the middle position, since at least some areas on the sidewall of the mating groove 21 have a thickness less than L1, the magnetic flux on the part of the sidewall of the mating groove 21 with a thickness less than L1 in the main magnetic circuit becomes saturated. As a result, the excess magnetic flux will flow directly along the axial direction to the moving iron core 20 or the stationary iron core 10, making the attraction between the moving iron core 20 and the stationary iron core 10 stronger, that is, the axial force and attraction force are stronger, thus achieving the required attraction.

[0038] When the moving iron core 20 and the stationary iron core 10 are in the mating position, that is, the air gap is at its minimum (almost 0), because at least some areas on the sidewall of the mating groove 21 have a thickness less than L1, the main magnetic circuit is in a highly saturated state. At this time, the magnetic resistance increases, and the change in electromagnetic force is that the increase in electromagnetic force between the moving iron core 20 and the stationary iron core 10 is more gradual than that of the "magnetic ring" scheme.

[0039] In some embodiments, such as Figures 1-5 , Figure 7 As shown, a first groove 22 is provided on the outer peripheral wall of the first mating part. Along the axial direction of the moving iron core 20, at least a portion of the first groove 22 is opposite to the mating groove 21, and the first groove 22 extends along the circumferential direction of the moving iron core 20. Thus, by providing the first groove 22, a region is defined between the bottom wall of the first groove 22 and the side wall of the mating groove 21 where the thickness of the side wall of the mating groove 21 is less than L1. This simplifies the structure, facilitates manufacturing, and reduces production costs.

[0040] Simultaneously, through the arrangement of the first groove 22, when the air gap is neither too large nor too small, i.e., when the air gap is in the middle position, there is a large electromagnetic force between the moving iron core 20 and the stationary iron core 10. For example, Figure 8 In the case where the GAP is between 0.5mm and 2mm, the electromagnetic force between the moving iron core 20 and the stationary iron core 10 is higher than that of the solenoid valve with only the mating groove 21. When the air gap is small, when the moving iron core 20 and the stationary iron core 10 are nearly fully engaged, the electromagnetic force between the moving iron core 20 and the stationary iron core 10 is smaller than that of the solenoid valve with planar engagement and the solenoid valve 200 with only the mating groove 21 in the related technology, which can reduce impact and noise.

[0041] The specific principle by which the above effect can be achieved by setting the mating groove 21 and the first groove 22 is as follows: When the moving iron core 20 moves from its initial position, the mating groove 21 plays a major role. The mating groove 21 can be a magnetic ring, which makes the magnetic path between the moving iron core 20 and the stationary iron core 10 shorter and the magnetic resistance smaller, resulting in a larger electromagnetic force between the moving iron core 20 and the stationary iron core 10.

[0042] When the moving iron core 20 moves toward the stationary iron core 10 and reaches the middle position, the magnetic flux at the position where the first groove 33 is located in the main magnetic circuit is saturated due to the setting of the first groove 22. As a result, the excess magnetic flux will flow directly along the axial direction to the moving iron core 20 or the stationary iron core 10, making the attraction between the moving iron core 20 and the stationary iron core 10 greater, that is, the axial force and attraction force are greater, thus achieving the required attraction.

[0043] When the moving iron core 20 and the stationary iron core 10 are in the mating position, that is, the air gap is at its minimum (almost 0), the main magnetic circuit is in a highly saturated state due to the setting of the first groove 22. At this time, the magnetic resistance increases, and the change in electromagnetic force is that the increase in electromagnetic force between the moving iron core 20 and the stationary iron core 10 is more gradual than that of the "magnetic ring" scheme.

[0044] In related technologies, impurities (such as tiny iron filings, dirt, or oil stains) can easily affect the movement of the moving iron core along the axial direction of the stationary iron core. Impurities falling into the mating groove will hinder the complete closure of the stationary and moving iron cores, leading to increased leakage flux, decreased attraction force, and even overheating of the coil.

[0045] Therefore, in this invention, as Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the first groove 22 can serve as an impurity accommodating space. Impurities located on the outer peripheral wall of the first mating part can be stored through the first groove 22. For example, when the first mating part is provided on the moving iron core 20, the first groove 22 can accommodate a small amount of iron filings or oil stains, so that the impurities move with the moving iron core 20, preventing the impurities from entering the mating groove 21 and causing the moving iron core 20 to be lifted, resulting in magnetic leakage or jamming, thus ensuring that the moving iron core 20 moves reliably.

[0046] In some embodiments, such as Figure 3 and Figure 4 As shown, a second groove 23 is provided on the side wall of the mating groove 21, and the second groove 23 extends along the circumferential direction of the first mating part. Thus, by providing the second groove 23, a region is defined between the bottom wall of the second groove 23 and the outer peripheral wall of the first mating part where the thickness of the side wall of the mating groove 21 is less than L1, resulting in a simple structure, easy processing and manufacturing, and reduced production costs.

[0047] Meanwhile, the second groove 23 can serve as a space for impurities. Impurities located in the mating groove 21 can be stored through the second groove 23. For example, when the first mating part is provided on the moving iron core 20, the second groove 23 can accommodate a small amount of iron filings or oil stains, so that the impurities move with the moving iron core 20, preventing impurities from entering between the contact surfaces of the moving iron core 20 and the stationary iron core 10, causing the moving iron core 20 to be lifted, resulting in magnetic leakage or jamming, and ensuring that the movement of the moving iron core 20 is reliable.

[0048] In embodiments of the present invention, the specific structures of the first groove 22 and the second groove 23 can be set according to actual conditions. For example, the cross-sectional area of ​​the first groove 22 and the second groove 23 along the axial direction of the moving iron core 20 can be formed as square, circular, etc.

[0049] In some embodiments, such as Figure 2 As shown, the total depth of the mating groove 21 is H1, and the distance between the groove wall of the first groove 22 near the second mating part and the bottom wall of the mating groove 21 is H2, satisfying the condition: 30%≤H2 / H1≤70%. This satisfies the requirements for the placement of the first groove 22. While ensuring structural strength, when the moving iron core 20 moves towards the stationary iron core 10 and reaches the middle position, the first groove 33 can achieve magnetic flux saturation at the required position, making the attraction between the moving iron core 20 and the stationary iron core 10 stronger and achieving the required engagement. Furthermore, when the moving iron core 20 and the stationary iron core 10 are in the mating position, the first groove 22 can ensure that the main magnetic circuit at the required position is in a highly saturated state. At this time, the magnetic resistance increases, which softens the electromagnetic force between the moving iron core 20 and the stationary iron core 10, thereby reducing impact and noise. For example, in some specific embodiments, H2 / H1 can be 30%, 40%, 50%, 60%, 70%, etc.

[0050] For example, in some embodiments, such as Figure 4 and Figure 5 As shown, along the direction from the first mating part to the second mating part (e.g.) Figure 4 (From bottom to top) The cross-sectional area of ​​the sidewall of the mating groove 21 gradually decreases. This allows for a region where the thickness of the sidewall of the mating groove 21 is less than L1, resulting in a simple structure, easy manufacturing, and reduced production costs.

[0051] In some embodiments, such as Figure 4 and Figure 5 As shown, the outer peripheral wall of the first mating part has an inclined surface 24. In the direction from the first mating part to the second mating part, the inclined surface 24 extends inclinedly toward the central axis of the moving iron core 20, so that the groove sidewall of the mating groove 21 and the inclined surface 24 define a region where the thickness of the sidewall of the mating groove 21 is less than L1, which makes the structure simple, easy to process and manufacture, and can reduce production costs.

[0052] According to some embodiments of the present invention, such as Figure 7As shown, the second mating part is provided with a third groove 25. The distance between the outer peripheral wall of the second mating part and the groove sidewall of the third groove 25 is L2. At least a portion of the sidewall of the third groove 25 has a thickness less than L2. Because the thickness of the sidewall of the third groove 25 is less than L2, this region forms a saturation region in the closed magnetic circuit of the stationary iron core 10 and the moving iron core 20. When the moving iron core 20 moves to the end of the stationary iron core 10 closest to the moving iron core 20 and is opposite to the saturation region along the axial direction of the moving iron core 20, a preset non-zero air gap can be formed, and the magnetic flux flows through the saturation region. Saturation is easily achieved in the saturation zone, which can block part of the magnetic flux. This causes the force on the magnetic flux in the saturation zone to extend along the direction perpendicular to the movement of the moving iron core 20. In other words, there is no force along the axis of the moving iron core 20, which reduces the force on the moving iron core 20 along its axis. This reduces the attraction force, balances the initial attraction force, and thus reduces the attraction force between the moving iron core 20 and the stationary iron core 10 at the moment of high-speed attraction. It also reduces the impact acceleration, buffers the impact energy, and reduces the large mechanical impact noise generated by rigid collisions. This can significantly reduce working noise and vibration, and help extend the service life.

[0053] In an embodiment of the present invention, the specific structure of at least a portion of the sidewall of the third groove 25 having a thickness less than L2 can be set according to actual conditions.

[0054] For example, in some embodiments, a fourth groove is provided on the outer peripheral wall of the second mating part. At least a portion of the fourth groove is opposite to the third groove 25 along the axial direction of the moving iron core 20, and the fourth groove extends along the circumferential direction of the second mating part. Thus, by providing the fourth groove, a region is defined between the bottom wall of the fourth groove and the side wall of the third groove 25 where the thickness of the side wall of the third groove 25 is less than L2. This simplifies the structure, facilitates manufacturing, and reduces production costs.

[0055] Meanwhile, by setting the fourth groove, when the air gap is neither too large nor too small, that is, when the air gap is in the middle position, there is a large electromagnetic force between the moving iron core 20 and the stationary iron core 10; when the air gap is small, when the moving iron core 20 and the stationary iron core 10 are nearly fully attracted, the electromagnetic force between the moving iron core 20 and the stationary iron core 10 is smaller than the electromagnetic force of the solenoid valve with planar attraction and the solenoid valve 200 with only the mating groove 21 in the related technology, which can reduce impact and noise.

[0056] In addition, the fourth groove can serve as a space for impurities. Impurities located on the outer peripheral wall of the second mating part can be stored through the fourth groove. For example, when the second mating part is provided on the moving iron core 20, the fourth groove can accommodate a small amount of iron filings or oil stains, so that the impurities move with the moving iron core 20, preventing impurities from entering the interior of the fourth groove and causing the moving iron core 20 to be lifted, resulting in magnetic leakage or jamming, and ensuring that the movement of the moving iron core 20 is reliable.

[0057] For example, in some embodiments, a fifth groove is provided on the sidewall of the third groove 25, and the fifth groove extends along the circumferential direction of the second mating part. Thus, by providing the fifth groove, a region is defined between the bottom wall of the fifth groove and the outer peripheral wall of the second mating part where the thickness of the sidewall of the third groove 25 is less than L2, resulting in a simple structure, ease of manufacturing, and reduced production costs.

[0058] Meanwhile, the fifth groove can serve as a space for impurities. Impurities located in the mating groove 21 can be stored through the fifth groove. For example, when the second mating part is provided on the moving iron core 20, the fifth groove can accommodate a small amount of iron filings or oil stains, so that the impurities move with the moving iron core 20. This prevents impurities from entering between the contact surfaces of the moving iron core 20 and the stationary iron core 10, which would cause the moving iron core 20 to be lifted, resulting in magnetic leakage or jamming, and ensures that the movement of the moving iron core 20 is reliable.

[0059] For example, in some embodiments, such as Figure 7 As shown, along the direction from the second mating part to the first mating part (e.g.) Figure 7 (From bottom to top) The cross-sectional area of ​​the sidewall of the third groove 25 gradually decreases. 5 Thus, it is possible to achieve a region where the thickness of the sidewall of the third groove 25 is less than L2, resulting in a simple structure, easy processing and manufacturing, and reduced production costs.

[0060] In some embodiments, the outer peripheral wall of the second mating part has an inclined surface 24. In the direction from the second mating part to the first mating part, the inclined surface 24 extends inclinedly toward the direction close to the central axis of the moving iron core 20, so that the groove sidewall of the third groove 25 and the inclined surface 24 define a region where the thickness of the sidewall of the third groove 25 is less than L2, which makes the structure simple, easy to process and manufacture, and can reduce production costs.

[0061] In some embodiments, the groove sidewall of the third groove 25 has an inclined surface 24. In the direction from the second mating part to the first mating part, the inclined surface 24 extends inclinedly away from the central axis of the moving iron core 20, so that the outer peripheral wall of the first mating part and the inclined surface 24 define a region where the thickness of the sidewall of the third groove 25 is less than L2, which makes the structure simple, easy to process and manufacture, and can reduce production costs.

[0062] In some embodiments of the present invention, such as Figures 1-7As shown, the moving iron core 20 has an initial position and a mating position along the axial direction of the stationary iron core 10. In the initial position, the second mating part and the first mating part are spaced apart, or the second mating part is flush with or partially overlaps with the end of the mating groove 21 near the second mating part, which can meet the control requirements of the moving iron core 20 in the initial position. In the mating position, the end of the second mating part near the first mating part abuts against the bottom wall of the mating groove 21, ensuring that the stationary iron core 10 reliably limits the moving iron core 20, avoiding the need to add other structures to limit the moving iron core 20, and reducing production costs.

[0063] In related technologies, electromagnetic force has monotonicity, meaning that the electromagnetic force gradually increases as the air gap of the main magnetic circuit decreases. As a result, the moving iron core and the stationary iron core have large leakage flux in their initial positions, and the initial electromagnetic force attraction is small, requiring an increase in the coil volume to meet the required attraction force.

[0064] Thus, in the initial position, the second mating part is flush with or partially overlaps with the end of the mating groove 21 near the second mating part, so that the moving iron core 20 and the stationary iron core 10 can form a closed magnetic circuit in the initial position, which meets the required control requirements, facilitates the control of the moving iron core 20 in the initial position, ensures that the magnetic resistance after closure is minimized, avoids the generation of a large air gap, that is, the magnetic circuit is shortest and there is no air leakage, maintains the required electromagnetic force, avoids the generation of large magnetic resistance through air, prevents magnetic leakage, helps to improve the initial attraction force, improves the energy efficiency ratio, avoids increasing the volume of the coil 30 to meet the attraction force requirements, thereby reducing the volume of the coil 30, reducing production costs, and reducing the impact of impurities entering the mating groove 21 on the movement between the moving iron core 20 and the stationary iron core 10, ensuring that the moving iron core 20 moves smoothly.

[0065] In some embodiments, such as Figure 1 , Figures 3-5 As shown, the drive assembly 100 also includes an elastic element 40, which is disposed between the stationary iron core 10 and the moving iron core 20. The elastic element 40 can constantly drive the moving iron core 20 to move away from the stationary iron core 10. For example, the elastic element 40 can constantly drive the moving iron core 20 to move towards its initial position, which facilitates the reset of the moving iron core 20. Furthermore, the structure is simple, easy to manufacture, and can reduce production costs. For example, the elastic element 40 is a spring.

[0066] For example, when the coil 30 is energized, a magnetic field is generated, and an electromagnetic force is generated between the stationary iron core 10 and the moving iron core 20. This attracts the moving iron core 20 to move towards the stationary iron core 10 and overcomes the elastic force of the elastic element 40 or the pressure of the medium, so that the moving iron core 20 is in the mating position, thereby driving the valve core of the solenoid valve 200 to change the fluid passage, such as realizing the opening or closing of the solenoid valve 200. When the coil 30 is de-energized, the electromagnetic force disappears, and the piston 53 is reset under the action of the elastic force of the elastic element 40 or the pressure of the medium itself, so that the moving iron core 20 is in the initial position, thereby driving the valve core of the solenoid valve 200 to change the flow passage, such as realizing the closing or opening of the solenoid valve 200.

[0067] In some embodiments, such as Figure 2 As shown, the end face of the second mating part near the mating groove 21 is formed as a plane, which facilitates the processing and manufacturing of the second mating part, reduces production costs, and facilitates the mating of the second mating part with the mating groove 21, ensuring reliable mating.

[0068] In some embodiments, such as Figure 2 As shown, the cross-sectional area of ​​at least the portion of the second mating part that extends into the mating groove 21 remains unchanged, which facilitates the mating of the second mating part with the mating groove 21. This makes the structure simple, easy to process and manufacture, reduces production costs, and reduces magnetic leakage, ensuring reliable driving of the moving iron core 20.

[0069] In some embodiments, such as Figure 2 As shown, when the first mating part is provided on the moving iron core 20, the end of the stationary iron core 10 near the moving iron core 20 has a central boss 11. The central axis of the central boss 11 and the central axis of the mating groove 21 are coaxial. The cross-sectional area of ​​the central boss 11 remains unchanged. For example, the central boss 11 is formed into a cylindrical or frustum shape. The central boss 11 can extend into the mating groove 21. Thus, the central boss 11 can serve as the primary contact area for the concentration of main magnetic flux, achieving the required conduction. Moreover, the structure is simple, easy to process and manufacture, and can reduce production costs.

[0070] The solenoid valve 200 according to an embodiment of the present invention includes a drive assembly 100 for the solenoid valve 200 according to an embodiment of the present invention. Since the drive assembly 100 for the solenoid valve 200 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the solenoid valve 200 according to an embodiment of the present invention has a movable iron core 20 located on one side of the stationary iron core 10 along the axial direction and movable along the axial direction of the stationary iron core 10. The movable iron core 20 and the stationary iron core 10 have a first mating portion and a second mating portion at their respective ends facing each other. A mating groove 21 is provided on the end face of the first mating portion near the second mating portion, and the second mating portion is adapted to extend into the mating groove 21 of the movable iron core 20. The diameter of the end of the second mating portion near the first mating portion is at least the same as the aperture of the end of the mating groove 21 near the second mating portion. A coil 30 is sleeved around the stationary iron core 10 and the movable iron core 20 for... The moving iron core 20 is driven to move along the axial direction of the stationary iron core 10. During the process of the moving iron core 20 moving from the initial position to the mating position, the electromagnetic force between the moving iron core 20 and the stationary iron core 10 can be increased. It has a higher electromagnetic force than the "planar attraction" solenoid valve in related technologies. It can avoid the use of a larger solenoid head, realize the miniaturization of the solenoid valve 200, and reduce costs. Moreover, the end of the second mating part near the first mating part can seal the end of the mating groove 21 near the second mating part, avoiding the generation of large magnetic resistance through air, thereby avoiding the generation of large air gaps, preventing magnetic leakage, maintaining the required electromagnetic force, ensuring reliable driving of the moving iron core 20, improving the energy efficiency ratio, thereby reducing the size of the coil 30 and helping to reduce production costs.

[0071] For example, solenoid valve 200 can be normally open or normally closed.

[0072] Among them, the solenoid valve 200 can be applied to industrial automation control systems to meet the required control needs.

[0073] In some embodiments, such as Figures 1-5 As shown, the solenoid valve 200 includes a valve needle 52, a valve body 56, and a piston 53. The valve body 56 has a valve cavity 561, an inlet 54, and an outlet 55. The inlet 54 and the outlet 55 communicate with the valve cavity 561. The piston 53 is located along the axial direction of the valve body 56 (e.g., along the axial direction of the valve body 56). Figure 1 The piston 53 is movably disposed in the valve chamber 561 (in the up-down direction shown in the figure), so that the piston 53 can open or close the outlet 55, thereby enabling the connection and disconnection of the inlet 54 and the outlet 55.

[0074] At the same time, such as Figures 1-5As shown, the valve needle 52 is connected to the moving iron core 20, and the piston 53 is provided with a connecting port 531, which is connected to the outlet 55. The moving iron core 20 can drive the valve needle 52 to open or close the connecting port 531. Thus, the connecting port 531 can be controlled by the valve needle 52, and the piston 53 can be controlled to open or close the outlet 55 by the pressure difference in the valve chamber 561, thereby realizing the opening and closing function of the solenoid valve 200.

[0075] In some embodiments, such as Figure 1 , Figures 3-5 As shown, there can be multiple inlets 54 (two or more). Multiple inlets 54 are spaced apart along the circumferential direction of the valve body 56. Multiple inlets 54 can increase the flow rate of the medium, which is beneficial to improving the working efficiency of the solenoid valve 200.

[0076] Other configurations and operations of the drive assembly 100 and solenoid valve 200 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0077] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0078] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A drive assembly for a solenoid valve, characterized in that, include: Static iron core (10); A moving iron core (20) is located on one side of the axial direction of the stationary iron core (10) and is movable along the axial direction of the stationary iron core (10). The moving iron core (20) and the stationary iron core (10) have a first mating part and a second mating part facing each other, respectively. The end face of the first mating part near the second mating part is provided with a mating groove (21), and the second mating part is adapted to extend into the mating groove (21). The diameter of the end of the second mating part near the first mating part is at least the same as the aperture of the end of the mating groove (21) near the second mating part. A coil (30) is sleeved on the outside of the stationary iron core (10) and the moving iron core (20) to drive the moving iron core (20) to move along the axial direction of the stationary iron core (10).

2. The drive assembly for a solenoid valve according to claim 1, characterized in that, The distance between the outer peripheral wall of the first mating part and the groove sidewall of the mating groove (21) is L1, and at least a portion of the sidewall of the mating groove (21) has a thickness less than L1.

3. The drive assembly for a solenoid valve according to claim 2, characterized in that, A first groove (22) is provided on the outer peripheral wall of the first mating part. Along the axial direction of the moving iron core (20), at least a portion of the first groove (22) is opposite to the mating groove (21). The first groove (22) extends along the circumferential direction of the first mating part. And / or, a second groove (23) is provided on the groove sidewall of the mating groove (21), and the second groove (23) extends along the circumferential direction of the first mating part.

4. The drive assembly for a solenoid valve according to claim 3, characterized in that, Along the direction from the first mating part to the second mating part, the cross-sectional area of ​​the sidewall of the mating groove (21) gradually decreases.

5. The drive assembly for a solenoid valve according to claim 4, characterized in that, The outer peripheral wall of the first mating part has an inclined surface (24), which extends inclinedly toward the central axis of the moving iron core (20) in the direction from the first mating part to the second mating part.

6. The drive assembly for a solenoid valve according to any one of claims 1-5, characterized in that, The second mating part is provided with a third groove (25), the distance between the outer peripheral wall of the second mating part and the groove side wall of the third groove (25) is L2, and at least a part of the side wall of the third groove (25) has a thickness less than L2.

7. The drive assembly for a solenoid valve according to claim 6, characterized in that, The outer peripheral wall of the second mating part is provided with a fourth groove, which is located along the axial direction of the moving iron core (20). At least part of the fourth groove is opposite to the third groove, and the fourth groove extends along the circumferential direction of the second mating part. And / or, a fifth groove is provided on the groove sidewall of the third groove, and the fifth groove extends along the circumferential direction of the second mating part; And / or, along the direction from the second mating portion to the first mating portion, the cross-sectional area of ​​the sidewall of the third groove gradually decreases.

8. The drive assembly for a solenoid valve according to claim 1, characterized in that, The moving iron core (20) has an initial position and a mating position along the axial direction of the stationary iron core (10). In the initial position, the second mating part and the first mating part are spaced apart, or the second mating part is flush with or partially overlaps with one end of the mating groove (21) near the second mating part; in the mating position, the end of the second mating part near the first mating part abuts against the bottom wall of the mating groove (21).

9. The drive assembly for a solenoid valve according to claim 1, characterized in that, The end face of the second mating part near the mating groove (21) is formed as a plane; And / or, the cross-sectional area of ​​at least the portion of the second mating part extending into the mating groove (21) remains unchanged; And / or, the drive assembly (100) further includes an elastic element (40) disposed between the stationary iron core (10) and the moving iron core (20) for driving the moving iron core (20) to move toward a side away from the stationary iron core (10).

10. A solenoid valve, characterized in that, Includes a drive assembly (100) for a solenoid valve (200) according to any one of claims 1-9.

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