solenoid valve

Abstract

An electromagnetic valve includes a valve housing having an inlet to introduce fluid at one end of the valve housing and an outlet to discharge the fluid at the other end of the valve housing, a solenoid disposed in the valve housing and arranged between the inlet and the outlet, a first plunger disposed at one end of the solenoid near the inlet and configured to selectively open or close the inlet by linear movement of the solenoid, a first spring member configured to provide an elastic force to allow the first plunger to move in a direction in which the first plunger closes the inlet, a second plunger disposed at the other end of the solenoid near the outlet and configured to selectively open or close the outlet by being linearly moved in a direction opposite to a direction of movement of the first plunger by the solenoid, and a second spring member configured to provide an elastic force to allow the second plunger to move in a direction in which the second plunger closes the outlet. The electromagnetic valve has a simplified structure while ensuring sealing.

Description

[0001] Citations of relevant applications

[0002] This application claims priority to Korean Patent Application No. 10-2020-0149459, filed on November 10, 2020, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to a solenoid valve, and more specifically, to a solenoid valve having the features of ensuring sealing and a simplified structure. Background Technology

[0004] Solenoid valves can be used to regulate fluid flow or control pressure (flow rate), etc.

[0005] For example, solenoid valves can be installed in the powertrain, including the vehicle engine, and can be used to regulate the flow of fluids such as fuel or engine oil, or to control pressure. More specifically, solenoid valves installed in the fuel system can control the supply and injection of fuel. Solenoid valves installed in the cooling system can control the circulation of lubrication and cooling. Solenoid valves installed in the power transmission system can be used to control pressure and flow rate.

[0006] Furthermore, if the sealing performance of the solenoid valve cannot be ensured, the following problems may occur: difficulty in accurately regulating (connecting / cutting off) the flow of fluid, reduced accuracy of flow control, and potential safety accidents. Therefore, it is necessary to ensure the sealing performance of the solenoid valve.

[0007] For example, if hydrogen leaks from a solenoid valve installed in a hydrogen supply line that requires a high degree of sealing, safety problems may occur, such as component damage, explosion, or fire. Therefore, it is necessary to ensure the sealing performance of the solenoid valve.

[0008] However, in existing technologies, to ensure the stability and sealing of solenoid valves, separate shut-off solenoid valves for regulating fluid flow and flow control solenoid valves for controlling fluid flow rate are required. This results in several problems: increased structural complexity, reduced space utilization and design freedom, and increased cost and weight.

[0009] To address this, recent research has focused on ensuring the sealing performance of solenoid valves and simplifying their structure; however, the results remain insufficient. Therefore, there is a need to develop a solenoid valve that ensures both sealing performance and a simplified structure. Summary of the Invention

[0010] This disclosure aims to provide a solenoid valve that ensures sealing and simplifies the structure.

[0011] This disclosure also aims to achieve a double-cut structure by using a single solenoid.

[0012] This disclosure also aims to improve space utilization and design freedom while reducing costs and weight.

[0013] This disclosure also aims to improve stability and reliability.

[0014] This disclosure also aims to improve the accuracy of proportional control.

[0015] The objectives of this disclosure are not limited to those described above, but also include objectives or effects that can be confirmed from the solutions or embodiments described below.

[0016] On one hand, this disclosure provides a solenoid valve comprising: a valve body having an inlet for introducing fluid at one end and an outlet for discharging fluid at the other end; a solenoid disposed within the valve body and arranged between the inlet and the outlet; a first plunger disposed at one end of the solenoid near the inlet and configured to selectively open or close the inlet by linear movement of the solenoid; a first spring member configured to provide a spring force to allow the first plunger to move in a direction in which the first plunger closes the inlet; a second plunger disposed at the other end of the solenoid near the outlet and configured to selectively open or close the outlet by linear movement of the solenoid in a direction opposite to the direction of movement of the first plunger; and a second spring member configured to provide a spring force to allow the second plunger to move in a direction in which the second plunger closes the outlet.

[0017] The above-mentioned solenoid valve configuration is designed to ensure the solenoid valve's sealing performance and simplify its structure.

[0018] In other words, flow rate can be controlled by using a solenoid valve (flow control valve) to regulate (on / off) fluid flow. However, a problem with the prior art is that maintaining a high level of sealing is difficult when using a solenoid valve that performs both functions. This is especially true in the event of overpressure, where one function is regulating fluid flow and the other is controlling flow rate.

[0019] Furthermore, in the prior art, when flow is obstructed due to component defects or foreign objects in the solenoid valve (flow control valve), or when fluid leaks from the sealing surface, there is a risk of directly causing a safety accident.

[0020] Therefore, in systems or facilities requiring improved stability and sealing (e.g., hydrogen supply pipelines), the shut-off solenoid valve for regulating fluid flow and the flow control solenoid valve for controlling fluid flow rate are installed independently. As mentioned above, in the prior art, in systems or equipment requiring improved stability and sealing, it is necessary to separately install the shut-off solenoid valve for regulating fluid flow and the flow control solenoid valve for controlling fluid flow rate. This results in the following problems: increased structural complexity, reduced space utilization and design freedom, and increased cost.

[0021] However, according to embodiments of this disclosure, a dual-cutoff sealing structure is formed by using independently operating first and second plungers. Therefore, beneficial effects such as ensuring high sealing performance and improving stability and reliability can be achieved.

[0022] Most importantly, according to embodiments of this disclosure, a double-cut-off structure is formed when the first and second plungers operate independently using a single solenoid. Therefore, beneficial effects such as ensuring high sealing performance, simplifying the structure, and improving space utilization and design freedom can be achieved.

[0023] In addition, the number of components to be controlled can be reduced, thereby reducing controller and wiring costs.

[0024] Furthermore, according to embodiments of this disclosure, the first plunger and the second plunger can operate independently. Therefore, even if either the first plunger or the second plunger malfunctions (is damaged), the beneficial effect of maintaining a seal can be achieved.

[0025] The timing of moving the first and second plungers via the solenoid can vary depending on the required conditions and design specifications.

[0026] According to embodiments of this disclosure, the second plunger and the first plunger sequentially open or close the outlet and inlet based on the duty cycle of the solenoid.

[0027] Specifically, when the solenoid's duty cycle is within a first range, the second plunger can close the outlet, and the first plunger can close the inlet. When the solenoid's duty cycle is within a second range greater than the first range, the second plunger can open the outlet, and the first plunger can close the inlet. When the solenoid's duty cycle is within a third range greater than the second range, the first plunger can open the inlet while the second plunger is opening the outlet.

[0028] According to an embodiment of this disclosure, fluid introduced into the valve housing through the inlet can apply pressure to the first plunger, causing the first plunger to move in the direction in which the first plunger opens the inlet.

[0029] This movement is designed to minimize the decrease in the operating performance of the first plunger caused by the inflow pressure of the fluid introduced into the valve housing through the inlet.

[0030] In other words, if the inflow pressure of the fluid introduced into the valve housing is applied to the lower part of the first plunger in an upward / downward direction (i.e., if the pressing force for moving the first plunger upward is applied to the lower part of the first plunger), the problem is that the first plunger is difficult to move normally at the preset duty cycle of the solenoid (moving downward to open the inlet). Another problem is that the duty cycle of the solenoid used to operate the first plunger inevitably increases.

[0031] However, according to embodiments of this disclosure, since the inflow pressure of the fluid introduced into the valve housing is applied to the upper part of the first plunger in an upward / downward direction, it is beneficial to prevent the increase of the duty cycle of the solenoid operating the first plunger (opening the inlet) and to fully ensure the duty cycle controllable portion in which the movement (stroke) of the first plunger can be controlled by the duty cycle (improving control performance).

[0032] Specifically, the direction of fluid inflow through the inlet can be the same as the direction of fluid outflow through the outlet to the outside of the valve body.

[0033] The solenoid can have various structures that can provide driving force for operating the first and second plungers.

[0034] According to embodiments of this disclosure, the solenoid may include a spool wound with a coil and a support disposed on the spool. The support may be disposed at one end of the spool such that a first plunger is partially received within the support for linear movement. A second plunger may be partially received at the other end of the spool for linear movement.

[0035] According to embodiments of the present disclosure, the solenoid valve may include a guide member disposed in a spool at the other end of a spool and configured to guide linear movement of a second plunger.

[0036] As described above, by placing the guide component in the linear shaft, it is possible to achieve the beneficial effect of minimizing the left and right movement and deviation of the second plunger when it moves linearly, thereby improving the driving stability of the second plunger.

[0037] According to embodiments of this disclosure, a first guiding flow path may be disposed between an inlet and a second plunger, and configured to guide fluid introduced into the inlet to the second plunger. A second guiding flow path may be disposed between the first plunger and an outlet, and configured to guide fluid passing through the first guiding flow path to the outlet. For example, the first guiding flow path may be formed on the first plunger, and the second guiding flow path may be formed on the second plunger.

[0038] According to embodiments of this disclosure, the solenoid valve may include a core disposed in a linear shaft and between a first plunger and a second plunger. The core may have a through-flow path configured to guide fluid through a first guide path to a second guide path.

[0039] In other words, since the core is positioned between the first and second plungers, when power is applied to the coil, the core can generate an additional magnetic field that moves the first and second plungers toward the central portion of the spool. Therefore, without increasing the size of the solenoid, the beneficial effects of ensuring smoother operation of the first and second plungers and increasing the magnetic field for moving them can be achieved.

[0040] According to embodiments of the present disclosure, the solenoid valve may include: a first buffer member disposed at an end of a first plunger facing the core; and a second buffer member disposed at an end of a second plunger facing the core.

[0041] As described above, since the first buffer member is disposed between the first plunger and the core, and the second buffer member is disposed between the second plunger and the core, the impact that occurs when the first and second plungers contact the core can be mitigated. Therefore, the beneficial effects of improved stability and reliability and reduced operating noise can be achieved.

[0042] According to an embodiment of this disclosure, when the second plunger is in the open outlet state, the second plunger can be configured to be in close contact with the lower part of the core, and the first plunger can open the inlet by moving linearly through the magnetic field applied by the core and the second plunger.

[0043] As described above, in the embodiments of this disclosure, since the magnetic field (the magnetic field for moving the first plunger) is generated by the core and the second plunger when the second plunger is in close contact with the lower part of the core and the outlet is open, the first plunger can be moved by using the magnetic field generated by the core and the magnetic field generated by the second plunger. Therefore, the beneficial effect of improving the efficiency of moving (operating) the first plunger can be obtained.

[0044] Furthermore, according to embodiments of this disclosure, a high magnetic field for smooth movement of the first plunger can be formed without increasing the inductance and size of the solenoid valve and the core. Therefore, the beneficial effects of simplified structure and miniaturization of the product can be achieved.

[0045] According to embodiments of the present disclosure, the solenoid valve may include: a first inclined notch formed at an end of a support facing the core; and a second inclined notch formed at an end of the core facing the first inclined notch.

[0046] As described above, since the first and second inclined notches are formed on the support and the core, the magnetic field applied to the first plunger can increase or decrease linearly in the direction of movement. Therefore, the following beneficial effects can be achieved: more precise control of the first plunger's stroke and further improvement in the accuracy of proportional control of the first plunger.

[0047] According to embodiments of this disclosure, the solenoid valve may include a pilot valve configured to selectively reduce the pressure around the second plunger.

[0048] The pilot valve can have various structures that can selectively reduce the pressure around the second plunger.

[0049] For example, a pilot valve may include a pilot valve groove and a pilot valve plunger formed in a second plunger, the pilot valve plunger being disposed in the pilot valve groove for linear movement and having a guide flow path communicating with an outlet. When the pilot valve plunger is in close contact with the inner surface of the pilot valve groove, a space is formed around the second plunger, and the guide flow path can be closed. When the pilot valve plunger is spaced apart from the inner surface of the pilot valve groove, the space around the second plunger and the guide flow path can communicate with each other.

[0050] As described above, when the pressure around the second plunger increases to a predetermined level or higher, the space around the second plunger and the guide flow path become interconnected as the pilot valve plunger moves downward, thus potentially reducing the pressure around the second plunger. Therefore, the beneficial effects of minimizing excessive pressure increase around the second plunger and preventing inoperability of the second plunger caused by excessive pressure increase can be achieved.

[0051] Specifically, the solenoid valve may include a guide sealing member disposed on the inner surface of the pilot valve groove and configured to selectively and tightly contact the pilot valve plunger. As described above, since the guide sealing member is disposed on the inner surface of the pilot valve groove, the beneficial effect of improving the sealing performance achieved by the pilot valve plunger can be obtained. Attached Figure Description

[0052] Figure 1 This is a view of a solenoid valve according to an embodiment of the present disclosure.

[0053] Figure 2 This is a view of the first plunger of a solenoid valve according to an embodiment of the present disclosure.

[0054] Figure 3 This is a view of the core according to an embodiment of the present disclosure.

[0055] Figure 4 This is a view of the second plunger of a solenoid valve according to an embodiment of the present disclosure.

[0056] Figure 5This is a view of the solenoid valve in the closed state according to an embodiment of the present disclosure.

[0057] Figures 6 to 8 This is a view of the structure of a first plunger and a second plunger for operating a solenoid valve according to an embodiment of the present disclosure.

[0058] Figure 9 The graph shows the stroke of the first and second plungers according to embodiments of the present disclosure, based on the solenoid duty cycle of the solenoid valve.

[0059] Figure 10 and Figure 11 This is a view of the pilot valve of a solenoid valve according to an embodiment of the present disclosure. Detailed Implementation

[0060] In the following description, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0061] However, the spirit of this disclosure is not limited to the embodiments described herein, but can be implemented in various different forms. Within the scope of the spirit of this disclosure, one or more components in the embodiments may be selectively combined and substituted.

[0062] Furthermore, unless otherwise specifically and explicitly defined and explained, the terms (including technical and scientific terms) used in the embodiments of this invention are to be interpreted in the sense that they are commonly understood by one of ordinary skill in the art to which this invention pertains. The meanings of commonly used terms, such as those defined in dictionaries, may be interpreted in light of the context of the relevant art.

[0063] Furthermore, the terminology used in the embodiments of this disclosure is for the purpose of explaining the embodiments and not for limiting the disclosure.

[0064] Unless otherwise specified in the context of this specification, the singular form may also include the plural form. The description of "at least one (or one or more) of A, B, and C" herein may include one or more of all combinations that can be made by combining A, B, and C.

[0065] Furthermore, when describing the constituent elements of embodiments of the present invention, terms such as first, second, A, B, (a) and (b) may be used.

[0066] These terms are used only to distinguish one component from another, and these terms are not limited to the nature, order, or sequence of the components.

[0067] Additionally, when a component is described as being “connected,” “coupled,” or “bonded” to another component, that component is directly “connected,” “coupled,” or “bonded” to the other component, or is “connected,” “coupled,” or “bonded” to the other component through another component inserted between that component and the other component.

[0068] Furthermore, the description of "one component being formed or disposed 'above' or 'below' another component" can include not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or disposed between two components. Additionally, the expression "above" or "below" can have meanings based on the downward direction of a component and the upward direction of a component. When components, devices, elements, etc., of this disclosure are described as having a purpose or performing an operation, function, etc., the component, device, or element should be considered herein as "configured" to fulfill that purpose or perform that operation or function. Furthermore, the controller described herein may include a processor programmed to perform said operation, function, etc.

[0069] Reference Figures 1 to 11 According to an embodiment of the present disclosure, the solenoid valve 10 includes a valve housing 100 having an inlet 110 for introducing fluid at one end and an outlet 120 for discharging fluid at the other end. The solenoid valve 10 also includes a solenoid 200 disposed within the valve housing 100 and arranged between the inlet 110 and the outlet 120. The solenoid valve 10 further includes: a first plunger 300 disposed at the end of the solenoid 200 near the inlet 110 and configured to selectively open or close the inlet 110 by linear motion via the solenoid 200; and a first spring member 310 configured to provide a spring force to allow the first plunger 300 to move in the direction in which the first plunger 300 closes the inlet 110. The solenoid valve 10 also includes a second plunger 400 disposed at the other end of the solenoid 200 near the outlet 120 and configured to selectively open or close the outlet 120 by linear movement of the solenoid 200 in a direction opposite to the direction of movement of the first plunger 300; and a second spring member 410 configured to provide a spring force to allow the second plunger 400 to move in the direction in which the second plunger 400 closes the outlet 120.

[0070] For reference, the solenoid valve 10 according to embodiments of this disclosure can be installed in various types of systems or facilities to regulate fluid flow or control flow rate or pressure. This disclosure is not limited or restricted to the type of system or facility in which the solenoid valve 10 is installed.

[0071] For example, the solenoid valve 10 according to embodiments of the present disclosure may be installed in a powertrain including a vehicle engine and may be used to regulate the flow of fluids such as fuel or engine oil or to control flow rate. More specifically, the solenoid valve 10 may be installed in a fuel system to control the operation of fuel supply and fuel injection, in a cooling system to control the circulation of lubrication and cooling, or in a power transmission system to control pressure.

[0072] The valve housing 100 may have various structures having a predetermined space therein and including an inlet 110 and an outlet 120. This disclosure is not limited or restricted by the structure and shape of the valve housing 100.

[0073] For example, according to Figure 1 An inlet 110 for supplying (introducing) fluid can be provided at the upper end of the valve housing 100. An outlet 120 for discharging fluid can be provided at the lower end of the valve housing 100. The fluid introduced into the valve housing 100 through the inlet 110 can pass sequentially through the first plunger 300 and the second plunger 400, and then be discharged to the outside of the valve housing 100 through the outlet 120.

[0074] Specifically, the fluid inflow direction introduced into the valve housing 100 through inlet 110 and the fluid outflow direction discharged to the outside of the valve housing 100 through outlet 120 can be the same as each other. For example, according to Figure 1 Both the fluid inflow direction and the fluid outflow direction can be set coaxially in the up-down direction (vertical direction).

[0075] According to another embodiment of this disclosure, the inlet and outlet may be formed in other locations within the valve housing. This disclosure is not limited to or constrained by the location and arrangement of the inlet and outlet. In some cases, the inlet and outlet may be arranged coaxially.

[0076] The solenoid 200 is configured to provide driving force for operating (e.g., moving up or down) the first plunger 300 and the second plunger 400.

[0077] Specifically, the solenoid 200 is located at the center of the valve housing 100, positioned between the inlet 110 and the outlet 120 within the valve housing 100.

[0078] The solenoid 200 may have various structures capable of providing driving force for operating the first plunger 300 and the second plunger 400. This disclosure is not limited or restricted to the type and structure of the solenoid 200.

[0079] For example, solenoid 200 may include a spool 210 with a coil 212 wound around it, and a yoke 220 disposed at one end of the spool 210 (based on...). Figure 1The first plunger 300 is located in the spool 210 at the upper end and is configured such that the first plunger 300 is partially housed in the support 220 for linear movement. The second plunger 400 is located at the other end of the spool 210 (based on...). Figure 1 The lower end is partially accommodated in the linear shaft 210 so that it can move linearly.

[0080] For example, the spool 210 may be formed as a hollow cylinder surrounding the first plunger 300 and the second plunger 400, and arranged in the central portion of the valve housing 100 (between the inlet and outlet).

[0081] The coil 212 is wound on the spool 210, and power can be applied to the coil 212 from the power supply unit (not shown).

[0082] The bracket 220 is configured to cover part of the inner circumferential surface of the upper end of the spool 210. The first plunger 300 is partially housed in the bracket 220 so as to be linearly movable.

[0083] The structure and dimensions of the support 220 may vary depending on the required conditions and design specifications. This disclosure is not limited or restricted by the structure and dimensions of the support 220.

[0084] For example, the bracket 220 may be configured to have a shorter length than the spool 210 (based on...) Figure 1 The support 220 is a hollow cylinder (length in the upward / downward direction). In particular, the upper opening (not shown) of the support 220 is arranged to point upward (e.g., toward the inlet), and the lower opening (not shown) of the support 220 is arranged to point downward (e.g., toward the second plunger).

[0085] The bracket 220 can be made of typical cast iron, and the material and properties of the bracket 220 can be varied depending on the required conditions and design specifications.

[0086] The first plunger 300 is located at one end of the solenoid 200 near the inlet 110 (based on...). Figure 1 At the upper end, and configured to selectively open or close the inlet 110 by linear movement of the solenoid 200.

[0087] The first plunger 300 may have various configurations that allow selective opening or closing of the inlet 110 by movement of the solenoid 200. This disclosure is not limited or restricted by the configuration or shape of the first plunger 300.

[0088] For example, the first plunger 300 may be formed as a rod (or column) having a predetermined diameter and a predetermined length.

[0089] The first plunger 300 is configured such that a portion of the first plunger 300 (e.g., a lower portion) is partially housed in the support 220, and the inlet 110 is selectively opened or closed by selectively moving linearly up / down on the line axis 210.

[0090] For reference, in embodiments of this disclosure, a configuration in which the first plunger 300 is partially housed in the yoke 220 may mean that a portion of the first plunger 300 is housed in the yoke 220 and the remainder of the first plunger is exposed (protruding) to the outside of the yoke 220.

[0091] The movement (stroke) of the first plunger 300 relative to the spool 210 can be controlled by adjusting the power applied to the coil 212. The movement (or stroke) of the first plunger 300 can be controlled to open or close the inlet 110, thereby selectively cutting off (regulating) fluid flow or controlling the flow rate.

[0092] For example, when the first plunger 300 moves upward, the first plunger 300 contacts the lower end of the inlet 110, thereby closing the inlet 110 (blocking).

[0093] Conversely, when the first plunger 300 moves downward, it moves downward from the lower end of the inlet 110, thereby opening the inlet 110. In other words, when power is applied to the coil 212 with the first plunger 300 partially housed in the support 220, the first plunger 300 moves (moves downward) toward the center portion of the spool 210 by the magnetic field applied to the first plunger 300, thereby opening the inlet 110.

[0094] For reference, since the solenoid valve 10 according to the embodiments of this disclosure includes a spool, a bracket, and a first plunger having the above-described structure and operating principle according to the prior art, a detailed description thereof is omitted.

[0095] Specifically, a first sealing member 320 (e.g., made of rubber or silicone) is disposed at the upper end of the first plunger 300 and configured to resiliently and tightly contact the inlet 110. As described above, since the first sealing member 320 is disposed at the upper end of the first plunger 300, the beneficial effect of improved sealing achieved by the first plunger 300 can be obtained.

[0096] Specifically, the fluid introduced into the valve housing 100 through inlet 110 applies pressure to the first plunger 300, causing the first plunger 300 to move in the direction in which the first plunger 300 opens inlet 110 (according to...). Figure 1 (Move down).

[0097] This is to minimize the performance degradation of the first plunger 300 due to the inflow pressure of the fluid introduced into the valve housing 100 through inlet 110 (i.e., the first plunger 300 does not operate at the preset duty cycle of the solenoid 200).

[0098] In other words, if the inflow pressure of the fluid introduced into the valve housing 100 is in the upward / downward direction (based on...) Figure 1 If the pressure applied to the lower part of the first plunger 300 is applied to the lower part of the first plunger, the problem is that the first plunger 300 is difficult to move normally (moving downward to open the inlet) at the preset duty cycle of the solenoid 200. Another problem is that the duty cycle of the solenoid 200 used to operate the first plunger 300 inevitably increases.

[0099] However, according to embodiments of this disclosure, since the pressure causing the first plunger to move downward is applied to the upper part of the first plunger, the inflow pressure of the fluid introduced into the valve housing 100 is in the upward / downward direction (based on...). Figure 1 The duty cycle is applied to the upper part of the first plunger 300. Therefore, the beneficial effect of preventing the increase of the duty cycle of the solenoid 200 that operates the first plunger 300 (opens the inlet) can be obtained, and the beneficial effect of fully ensuring the duty cycle controllable part, in which the movement (stroke) of the first plunger 300 can be controlled by the duty cycle (improving control performance) can be obtained.

[0100] Additionally, refer to Figure 1 and Figure 2 The first guide flow path 302 is disposed between the inlet 110 and the second plunger 400, and is configured to guide the fluid introduced into the inlet 110 to the second plunger 400.

[0101] The first guide flow path 302 can be configured to guide fluid introduced into the inlet 110 to various locations of the second plunger 400. This disclosure is not limited or restricted by the location of the first guide flow path 302.

[0102] According to embodiments of the present disclosure, a first guide flow path 302 configured to guide fluid introduced into inlet 110 to second plunger 400 may be provided on first plunger 300.

[0103] The first guide flow path 302 may have various structures capable of guiding fluid introduced through inlet 110 into valve housing 100 downwards (to the second plunger). This disclosure is not limited or restricted by the structure of the first guide flow path 302.

[0104] For example, the first guide flow path 302 can be formed by partially removing the outer surface (circumferential surface) of the first plunger 300. In particular, a pair of first guide flow paths 302 can be symmetrically formed on the outer surface of the first plunger 300.

[0105] For reference, examples of forming a first guide flow path on a first plunger have been described in the embodiments of the present disclosure described and illustrated above. However, according to another embodiment of the present disclosure, the first guide flow path may be formed on another component (e.g., at least one of a spool and a support) located between the inlet and the second plunger.

[0106] The first spring member 310 is configured to provide elastic force. Figure 5 SF1 in the first plunger 300), to move the first plunger 300 in the direction of closing the inlet 110 (based on SF1 in the first plunger 300). Figure 1 up).

[0107] A typical spring (e.g., a coil spring) capable of elastically supporting the upward and downward movement of the first plunger 300 may be used as the first spring member 310. This disclosure is not limited or restricted by the type and structure of the first spring member 310.

[0108] For example, the first spring member 310 may surround the first plunger 300 and may be arranged between the bracket 220 and the first flange portion (not shown) formed at the upper end of the first plunger 300, thereby being elastically compressible and repositionable.

[0109] According to another embodiment of this disclosure, the first spring member may be disposed between the valve housing and the first plunger or at any other location. In some cases, a separate support portion (not shown) for supporting the first spring member may be provided on the inner wall of the valve housing.

[0110] The second plunger 400 is located at one end of the solenoid valve 200 near the outlet 120 (based on...). Figure 1 The lower end of the valve is configured to selectively open or close the outlet 120 by means of the solenoid valve 200 moving linearly in a direction opposite to the direction of movement of the first plunger 300.

[0111] The second plunger 400 may have various configurations that allow selective opening or closing of the outlet 120 by movement of the solenoid 200. This disclosure is not limited or restricted by the configuration or shape of the second plunger 400.

[0112] For example, the second plunger 400 may be configured as a rod (or cylinder) with a predetermined diameter and a predetermined length.

[0113] In particular, the second plunger 400 may be made of a typical metal (e.g., iron) capable of forming a magnetic field together with the core 500, and this disclosure is not limited or restricted by the material of the second plunger 400.

[0114] The second plunger 400 is configured to selectively open or close the outlet 120 while selectively moving linearly up / down in the spindle 210, with a portion of the second plunger 400 (e.g., a portion of the upper part) partially housed in the bracket 220.

[0115] For reference, in embodiments of this disclosure, a configuration in which the second plunger 400 is partially housed in the inline shaft 210 may mean that a portion of the second plunger 400 is housed in the inline shaft 210 and the remainder of the second plunger is exposed to the outside of the inline shaft 210.

[0116] The movement of the second plunger 400 relative to the spool 210 can be controlled by adjusting (e.g., turning on / off) the power applied to the coil 212. The movement of the second plunger 400 can be controlled to open or close the outlet 120, thereby selectively shutting off (regulating) the flow of fluid.

[0117] For example, when the second plunger 400 moves downward, the second plunger 400 contacts the upper end of the outlet 120 so that the outlet 120 can be closed (blocked).

[0118] Conversely, when the second plunger 400 moves upward, it moves upward from the upper end of the outlet 120 to open the outlet 120. In other words, when power is applied to the coil 212 with the second plunger 400 partially housed in the spool 210, the second plunger 400 moves (moves upward) toward the center portion of the spool 210 by the magnetic field applied to it, thereby opening the outlet 120.

[0119] Specifically, a second sealing member 420 (e.g., made of rubber or silicone) is disposed at the lower end of the second plunger 400 and configured to resiliently contact the outlet 110. As described above, since the second sealing member 420 is disposed at the lower end of the second plunger 400, the beneficial effect of improved sealing achieved by the second plunger 400 is obtained.

[0120] In addition, refer to Figure 1 and Figure 4 The second guide flow path 402 is disposed between the first plunger 300 and the outlet 120, and is configured to guide the fluid passing through the first guide flow path 302 to the outlet 120.

[0121] The second guide flow path 402 can be set in various locations where the fluid passing through the first guide flow path 302 can be guided to the outlet 120, and the present invention is not limited or restricted by the location of the second guide flow path 402.

[0122] According to an embodiment of the present disclosure, a second guide flow path 402 is disposed on the second plunger 400 and configured to guide fluid through the first guide flow path 302 to the outlet 120.

[0123] The second guide flow path 402 may have various structures capable of guiding fluid through the first guide flow path 302 downward (to the outlet). This disclosure is not limited or restricted by the structure of the second guide flow path 402.

[0124] For example, the second guide flow path 402 can be formed by partially removing the outer surface (circumferential surface) of the second plunger 400. In particular, a pair of second guide flow paths 402 can be symmetrically formed on the outer surface of the second plunger 400.

[0125] For reference, examples of forming a second guide flow path on the second plunger have been described in the embodiments of the present disclosure described and illustrated above. However, according to another embodiment of the present disclosure, the second guide flow path may be formed on another component (e.g., at least one of a spool and a guide element) located between the first plunger and the outlet.

[0126] The second spring member 410 is configured to provide elastic force. Figure 5 SF2 in, to move the second plunger 400 in the direction of closing the outlet 120 (according to Figure 1 down).

[0127] A typical spring (e.g., a coil spring) capable of elastically supporting the upward and downward movement of the second plunger 400 can be used as the second spring member 410. This disclosure is not limited or restricted by the type and structure of the second spring member 410.

[0128] For example, the second spring member 410 may surround the second plunger 400 and may be arranged between the spool 210 and the second flange portion (not shown) formed at the lower end of the second plunger 300, thereby being elastically compressible and repositionable.

[0129] According to another embodiment of this disclosure, the second spring member may be disposed between the valve housing and the second plunger or at other locations. In some cases, a separate support portion (not shown) for supporting the second spring member may be provided on the inner wall of the valve housing.

[0130] According to embodiments of the present disclosure, the guide member 230 may be disposed at the other end of the spool 210 and in the spool 210, and configured to guide the upward and downward movement of the second plunger 400.

[0131] For example, the guide member 230 may be formed as a hollow cylinder surrounding the second plunger 400. The guide member 230 may be disposed between the inner peripheral surface of the spindle 210 and the outer peripheral surface of the second plunger 400, and configured to guide the linear movement of the second plunger 400. In particular, the lower end of the guide member 230 may extend to surround the bottom surface of the spindle 210.

[0132] As described above, since the guide component 230 is disposed in the linear shaft 210, the lateral movement and deviation of the second plunger 400 during linear motion are minimized. Furthermore, the driving stability of the second plunger 400 is improved.

[0133] According to embodiments of the present disclosure, the solenoid valve 10 may include a core 500 disposed in the solenoid 200 and between the first plunger 300 and the second plunger 400.

[0134] The core 500 is configured to ensure that the first plunger 300 and the second plunger 400 move more smoothly relative to the solenoid 200.

[0135] In other words, since the core 500 is disposed between the first plunger 300 and the second plunger 400, when power is applied to the coil 212, the core 500 can generate an additional magnetic field for moving the first plunger 300 and the second plunger 400 toward the center portion of the spool 210. Therefore, without increasing the size of the solenoid 200, the beneficial effects of ensuring smoother operation of the first plunger 300 and the second plunger 400 and increasing the magnetic field for moving the first plunger 300 and the second plunger 400 can be achieved.

[0136] The core 500 may be made of a typical metal (e.g., iron) capable of generating a magnetic field. This disclosure is not limited or restricted by the material of the core 500.

[0137] Specifically, refer to Figure 1 and Figure 3 A through flow path 502 is formed in the core 500 and configured to guide fluid through the first guide flow path 302 to the second guide flow path 402.

[0138] The through-flow path 502 may have various structures capable of guiding fluid through the first guide flow path 302 to the second guide flow path. This disclosure is not limited to or restricted by the structure or number of through-flow paths 502. For example, two through-flow paths 502 may be formed in the core 500 and pass through the core 500 in an upward / downward direction. According to another embodiment of this disclosure, the through-flow path may be formed on the circumferential surface of the core. In another embodiment, the through-flow path may be formed in an inclined or curved shape.

[0139] According to embodiments of the present disclosure, the solenoid valve 10 may include a first buffer member 330 disposed at one end (e.g., the lower end) of the first plunger 300 facing the core 500, and a second buffer member 430 disposed at one end (e.g., the upper end) of the second plunger 400 facing the core 500.

[0140] As described above, since the first buffer member 330 is disposed between the first plunger 300 and the core 500, and the second buffer member 430 is disposed between the second plunger 400 and the core 500, the impact generated when the first plunger 300 and the second plunger 400 contact the core 500 can be mitigated. Therefore, the beneficial effects of improved stability and reliability and reduced operating noise can be obtained.

[0141] The first buffer member 330 may be made of a buffer material (e.g., an elastic material) capable of mitigating the impact force generated when the end of the first plunger 300 contacts the core 500. This disclosure is not limited or restricted by the structure and material of the first buffer member 330.

[0142] Similarly, the second buffer member may be made of a buffer material (e.g., an elastic material) capable of mitigating the impact force generated when the end of the second plunger 400 contacts the core 500. This disclosure is not limited or restricted by the structure and material of the second buffer member.

[0143] In the embodiments of the present disclosure described and illustrated above, an example has been described in which a first buffer member 330 is disposed at the end of the first plunger 300 and a second buffer member 430 is disposed at the end of the second plunger 400. However, according to another embodiment of the present disclosure, the buffer members may be disposed on the upper and lower surfaces of the core.

[0144] Meanwhile, the timing of moving the first plunger 300 and the second plunger 400 via the solenoid 200 can be varied depending on the required conditions and design specifications.

[0145] According to embodiments of this disclosure, the first plunger 300 and the second plunger 400 sequentially open or close the outlet 120 and the inlet 110 based on the pulse width modulation (PWM) duty cycle of the solenoid 200.

[0146] For example, when the second plunger 400 moves upward based on the duty cycle of the solenoid 200, the outlet 120 can be opened before the inlet 110 is opened. Subsequently, when the first plunger 300 moves downward based on the duty cycle of the solenoid valve 200, the inlet 110 can be opened (at predetermined time intervals starting from the time point when the outlet is opened).

[0147] Conversely, when the first plunger 300 moves upward based on the duty cycle of the solenoid 200 with both outlet 120 and inlet 110 open, inlet 110 can be closed (before outlet 120 is closed). Therefore, when the second plunger 400 moves downward based on the duty cycle of the solenoid 200, outlet 120 can subsequently be closed (at a predetermined time interval from the time point when inlet is closed).

[0148] The timing of moving the first plunger 300 and the second plunger 400 can be varied based on the duty cycle of the solenoid 200. This disclosure is not limited or restricted by the timing of moving the first plunger 300 and the second plunger 400 based on the duty cycle of the solenoid 200.

[0149] Furthermore, the timing of moving the first plunger 300 and the second plunger 400 based on the duty cycle of the solenoid 200 can be adjusted by differently adjusting parameters related to the magnetic field formation of the first plunger 300 and the second plunger 400 (e.g., the shape and material of the first and second plungers and the shape and material of the guide member) or by differently adjusting parameters related to the first and second spring members 310 and 410 (e.g., constants).

[0150] For example, when the duty cycle of solenoid 200 is within a first range, the second plunger 400 can close the outlet 120, and the first plunger 300 can close the inlet 110. Conversely, when the duty cycle of solenoid 200 is within a second range greater than the first range, the second plunger 400 can open the outlet 120, and the first plunger 300 can close the inlet 110. Furthermore, when the duty cycle of solenoid 200 is within a third range greater than the second range, the first plunger 300 can open the inlet 110 while the outlet 120 is open.

[0151] For example, refer to Figure 9 When the target duty cycle of solenoid 200 is 100%, the duty cycle of solenoid 200 can be linearly (periodically) increased from 0% to 100%. For example, the first range can be in the range of 0 to 19%, the second range can be in the range of 20 to 39%, and the third range can be in the range of 40 to 100%.

[0152] For reference, Figure 9In the diagram, point "a" represents the point where the duty cycle of solenoid 200 is 0%. Point "b" represents the point where the second plunger 400 begins to open outlet 120. Point "c" represents the point where the first plunger 300 begins to open inlet 110. The portion between points "c" and "d" controls the duty cycle related to the opening operation (opening the inlet) of the first plunger 300. Point "d" represents the point where the first plunger 300 begins to open inlet 110 to its maximum extent. Point "e" represents the point where the duty cycle of solenoid 200 is 100%. Point "f" represents the point where the first plunger 300 begins to close inlet 110. The portion between points "f" and "g" controls the duty cycle related to the closing operation (closing the inlet) of the first plunger 300. Point "g" represents the point where the first plunger 300 begins to completely (to its maximum extent) close inlet 110. Point "h" marks the point where the second plunger 400 begins to close outlet 120. Point "i" marks the point where the duty cycle of solenoid 200 is 0%.

[0153] More specifically, when the duty cycle of solenoid 200 is within the first range (see...) Figure 9 (The part between "a" and "b" in the text), the second plunger 400 can close the outlet 120, and the first plunger 300 can close the inlet 110. In this case, the outlet 120 can be kept closed by the spring force SF2 of the second spring member 410, and the inlet 110 can be kept closed by the spring force SF1 of the first spring member 310.

[0154] Next, when the duty cycle of solenoid 200 is in the second range (see...) Figure 9 The portion between “b” and “c” in the diagram maintains the state where the first plunger 300 closes the inlet 110 and the second plunger 400 opens the outlet 120 (see [reference]). Figure 6 ).

[0155] Next, when the duty cycle of solenoid 200 is in the third range (see...) Figure 9 The part between “c” and “d” in the text), the first plunger 300 opens the inlet 110 with the second plunger 400 opening the outlet 120 (see Figure 7 ).

[0156] Specifically, with the second plunger 400 in the open outlet 120 state, the second plunger 400 can be configured to be in close contact with the lower part of the core 500. The first plunger 300 can open the inlet 110 by moving linearly through the magnetic field applied by the core 500 and the second plunger 400.

[0157] As described above, in the embodiments of this disclosure, since the second plunger 400 is in close contact with the lower part of the core 500 and the outlet 120 is open, the core 500 and the second plunger 400 generate a magnetic field (a magnetic field for moving the first plunger). The first plunger 300 can be moved by utilizing the magnetic field generated by the core 500 and the magnetic field generated by the second plunger 400. Therefore, the beneficial effect of improving the efficiency of moving (operating) the first plunger 300 can be obtained.

[0158] Furthermore, according to embodiments of this disclosure, a high magnetic field (generated by the core and generated by the second plunger) can be formed for smooth movement of the first plunger 300 without increasing the inductance and size of the solenoid 200 and the core 500. Therefore, the beneficial effects of simplified structure and miniaturization of the product can be achieved.

[0159] In other words, with the second plunger 400 in close contact with the lower part of the core 500 and the outlet 120 in the open state, similar performance can be obtained as when the first plunger 300 is operated by using another solenoid (not shown) with a larger capacity and another core (not shown) with a larger capacity.

[0160] Furthermore, when the duty cycle of the solenoid 200 is within the third range, the travel of the first plunger 300 is variable due to the change in the duty cycle of the solenoid 200 (i.e., the first plunger can move in the up / down direction). Therefore, when the travel of the first plunger 300 changes, the flow rate of fluid to be introduced into the inlet 110 can be adjusted (see...). Figure 8 ).

[0161] Conversely, when the duty cycle of solenoid valve 200 is in the state where both outlet 120 and inlet 110 are fully open (see...) Figure 9 When the part between "d" and "f" in the text becomes the third range again (see...) Figure 9 (The part between "f" and "g" in the text), with the second plunger 400 opening the outlet 120, the first plunger 300 closing the inlet 110.

[0162] Next, when the duty cycle of solenoid 200 returns to the second range (see...) Figure 9 (The part between "g" and "h" in the text), with the first plunger 300 closing the inlet 110, the second plunger 400 closing the outlet 120.

[0163] Next, when the duty cycle of solenoid 200 returns to the first range (see...) Figure 9(The part between "h" and "i"), the closed state of outlet 120 can be maintained by the elastic force SF2 of the second spring member 410, and the closed state of inlet 110 can be maintained by the elastic force SF1 of the first spring member 310.

[0164] As described above, according to embodiments of this disclosure, the first plunger 300 and the second plunger 400 operate independently to close the inlet 110 and the outlet 120, thereby achieving a dual shut-off structure. Therefore, beneficial effects such as ensuring high sealing performance and improving stability and reliability can be achieved.

[0165] Furthermore, according to embodiments of this disclosure, the first plunger 300 and the second plunger 400 can be operated independently by a single solenoid 200, without the need for multiple solenoids 200. Therefore, the beneficial effects of simplified structure, improved space utilization and design freedom, and reduced cost are achieved.

[0166] Furthermore, according to embodiments of this disclosure, the first plunger 300 and the second plunger 400 can operate sequentially based on the duty cycle of the solenoid 200, such that the movement of the first plunger 300 and the second plunger 400 can be controlled by a single controller. Therefore, the structure of the controller and the structure for connecting the controller can be further simplified.

[0167] Furthermore, according to embodiments of this disclosure, the first plunger 300 and the second plunger 400 can operate independently. Therefore, even if either the first plunger 300 or the second plunger 400 malfunctions (is damaged), the beneficial effect of maintaining a seal can be achieved.

[0168] According to an embodiment of this disclosure, the solenoid valve 10 may include a first inclined recess 222 formed at the end of the support 220 facing the core 500, and a second inclined recess 504 formed at the end of the core 500 facing the first inclined recess 222.

[0169] For example, a first inclined notch 222 may be formed at the lower end of the support 220, and a second inclined notch 504 may be formed at the upper end of the core 500.

[0170] Specifically, the first inclined notch 222 and the second inclined notch 504 may be inclined in opposite directions, and the first inclined notch 222 and the second inclined notch 504 may have corresponding inclinations.

[0171] For example, based on Figure 1 A first inclined notch 222 may be formed at the lower end of the support 220 to be inclined upward, and a second inclined notch 504 having an inclination corresponding to the inclination of the first inclined notch 222 may be formed at the upper end of the core 500 to be inclined downward.

[0172] According to another embodiment of this disclosure, the first inclined notch and the second inclined notch may be inclined in the same direction (inverted upwards or downwards).

[0173] As described above, since the first inclined notch 222 and the second inclined notch 504 are formed on the bracket 220 and the core 500 respectively, the beneficial effect of further improving the proportional control accuracy of the first plunger 300 can be obtained.

[0174] In other words, since the first inclined notch 222 is formed at the lower end of the support 220 and the second inclined recess 504 is formed at the upper end of the core 500, the magnetic field to be applied to the first plunger 300 can be linearly increased or decreased in the upward / downward direction. Therefore, the following beneficial effects can be achieved: more accurate control of the travel of the first plunger 300 and further improvement in the proportional control precision of the first plunger 300.

[0175] According to embodiments of the present disclosure, the solenoid valve 10 may include a pilot valve 600 configured to selectively reduce the pressure around the second plunger 400.

[0176] When fluid leaks between the inlet 110 and the first plunger 300 due to a decrease in the sealing performance of the first plunger 300, a pilot valve 600 is provided to minimize an excessive increase in the pressure LP around the second plunger 400 (the pressure used to move the second plunger downward). The pilot valve 600 is also used to prevent the second plunger 400 from becoming inoperable due to an excessive increase in the pressure around it.

[0177] The pilot valve 600 may have various configurations capable of selectively reducing the pressure around the second plunger 400. This disclosure is not limited or restricted by the type and configuration of the pilot valve 600.

[0178] For example, the pilot valve 600 may include a pilot valve groove 610 and a pilot valve plunger 620 formed in the second plunger 400. The pilot valve plunger 620 is disposed in the pilot valve groove 610 for linear movement and has a guide passage 622 communicating with the outlet 120. When the pilot valve plunger 620 is in close contact with the inner surface of the pilot valve groove 610 (according to...), Figure 10 (When the pilot valve plunger 620 moves upward), the space around the second plunger 400 and the guide passage 622 are closed. When the pilot valve plunger 620 separates from the inner surface of the pilot valve groove 610 (based on...) Figure 10 (The pilot valve plunger 620 moves downward), and the space around the second plunger 400 and the guide flow path 622 can communicate with each other.

[0179] For reference, when the second sealing member 420 is disposed on the lower part of the second plunger 400, the second sealing member 420 may have a connecting flow path (not shown) that allows the guide flow path 622 and the outlet 120 to communicate with each other.

[0180] When the pressure around the second plunger 400 increases to a predetermined level or higher, fluid is introduced into the upper space of the pilot valve plunger 620 (the space between the upper surface of the pilot valve plunger and the inner surface of the pilot valve groove) through the gap between the pilot valve groove 610 and the pilot valve plunger 620, so that the pilot valve plunger 620 can move downward.

[0181] As described above, when the pressure around the second plunger 400 increases to a predetermined level or higher, the space around the second plunger 400 and the guide flow path 622 can communicate with each other when the pilot valve plunger 620 moves downward, thus reducing the pressure around the second plunger 400.

[0182] Specifically, the solenoid valve 10 may include a guide sealing member 630 (e.g., made of rubber or silicone) disposed on the inner surface of the guide valve groove 610, such that the guide valve plunger 620 can selectively come into close contact with the guide sealing member 630. As described above, since the guide sealing member 630 is disposed on the inner surface of the guide valve groove 610, the beneficial effect of improving the sealing performance achieved by the guide valve plunger 620 can be obtained.

[0183] As described above, the embodiments of this disclosure provide the beneficial effects of ensuring sealing and simplifying the structure.

[0184] In particular, according to embodiments of this disclosure, the beneficial effect of achieving a double-cut-off (sealed) structure can be obtained by using a single solenoid.

[0185] Furthermore, according to embodiments of this disclosure, beneficial effects such as improved space utilization and design freedom, as well as reduced costs, can be achieved.

[0186] Furthermore, according to the embodiments of this disclosure, beneficial effects such as improved stability and reliability can be obtained.

[0187] Furthermore, according to the embodiments of this disclosure, the beneficial effect of improving the accuracy of proportional control can be obtained.

[0188] Although specific embodiments have been described above, these embodiments are intended to be illustrative only and not to limit the scope of this disclosure. Those skilled in the art will understand that various modifications and alterations not described above can be made to these embodiments without departing from their essential characteristics. For example, the various components specifically described in the embodiments may be modified and then implemented. Furthermore, it should be understood that differences relating to modifications and alterations are included within the scope of this disclosure as defined by the appended claims.

Claims

1. A solenoid valve, comprising: A valve housing having an inlet for introducing fluid at one end and an outlet for discharging fluid at the other end; A solenoid, which is disposed in the valve housing and arranged between the inlet and the outlet; A first plunger is disposed at one end of the solenoid near the inlet and configured to selectively open or close the inlet by linear movement through the solenoid. A first spring member is configured to provide a spring force to allow the first plunger to move in the direction in which the first plunger closes the inlet; A second plunger is disposed at the other end of the solenoid near the outlet and configured to selectively open or close the outlet by the solenoid moving linearly in a direction opposite to the direction of movement of the first plunger. as well as A second spring member, configured to provide a spring force to allow the second plunger to move in the direction in which the second plunger closes the outlet, The second plunger and the first plunger sequentially open or close the outlet and the inlet based on the duty cycle of the solenoid. When the duty cycle of the solenoid is within a first range, the second plunger closes the outlet, and the first plunger closes the inlet; Specifically, when the duty cycle of the solenoid is within a second range greater than the first range, the second plunger opens the outlet, while the first plunger closes the inlet; and Specifically, when the duty cycle of the solenoid is within a third range greater than the second range, the first plunger opens the inlet while the second plunger is opening the outlet.

2. The solenoid valve according to claim 1, wherein, The solenoid includes: A spool, with a coil wound around it; and A bracket is disposed within the spool at one end, such that the first plunger is partially accommodated within the bracket to allow for linear movement. The second plunger is partially housed within the spool at the other end of the spool so that it can move linearly.

3. The solenoid valve according to claim 2, wherein, A first guide flow path is disposed between the inlet and the second plunger and configured to guide fluid introduced into the inlet to the second plunger, and wherein a second guide flow path is disposed between the first plunger and the outlet and configured to guide fluid passing through the first guide flow path to the outlet.

4. The solenoid valve according to claim 3, wherein, The first guide flow path is formed on the first plunger, and the second guide flow path is formed on the second plunger.

5. The solenoid valve according to claim 4, comprising: The core portion is disposed within the solenoid and arranged between the first plunger and the second plunger. The core has a through flow path, which is configured to guide fluid passing through the first guide flow path to the second guide flow path.

6. The solenoid valve according to claim 5, comprising: A first inclined notch is formed at the end of the bracket facing the core. and A second inclined notch is formed at the end of the core to face the first inclined notch.

7. The solenoid valve according to claim 6, wherein, The first inclined notch and the second inclined notch are inclined in opposite directions, and wherein the first inclined notch and the second inclined notch have an inclination corresponding to each other.

8. The solenoid valve according to claim 5, comprising: A first buffer member is disposed at the end of the first plunger facing the core. and A second buffer member is disposed at the end of the second plunger facing the core.

9. The solenoid valve according to claim 2, comprising: A guide member is disposed at the other end of the spool and configured to guide the linear movement of the second plunger.

10. The solenoid valve according to claim 5, wherein, When the second plunger approaches the core to open the outlet, the first plunger moves linearly within the support under the influence of the magnetic field applied by the core and the second plunger.

11. The solenoid valve according to claim 1, comprising: A first sealing member is disposed on the first plunger and configured to be in close contact with the inlet.

12. The solenoid valve according to claim 1, comprising: A second sealing member is disposed on the second plunger and configured to be in close contact with the outlet.

13. The solenoid valve according to claim 1, wherein, Fluid introduced into the valve housing through the inlet applies pressure to the first plunger, causing the first plunger to move in the direction in which the first plunger opens the inlet.

14. The solenoid valve according to claim 1, wherein, The fluid flow direction introduced through the inlet is the same as the fluid flow direction discharged through the outlet to the outside of the valve housing.

15. The solenoid valve according to claim 1, comprising: A pilot valve configured to selectively reduce the pressure around the second plunger.

16. The solenoid valve according to claim 15, wherein, The pilot valve includes: A pilot valve groove is formed in the second plunger; and A pilot valve plunger is disposed in the pilot valve groove to enable linear movement and has a guide flow path communicating with the outlet. When the pilot valve plunger is in close contact with the inner surface of the pilot valve groove, the space around the second plunger and the guide flow path is closed, and when the pilot valve plunger is spaced apart from the inner surface of the pilot valve groove, the space around the second plunger and the guide flow path are connected to each other.

17. The solenoid valve according to claim 16, comprising: A guide sealing member is disposed on the inner surface of the guide valve groove and configured to selectively make close contact with the guide valve plunger.

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