Explosion-proof solenoid valve limiting maximum surface temperature and fuel feeding system including the same

Abstract

The present invention relates to an explosion-proof solenoid valve that limits the maximum surface temperature and a fuel supply system including the same. An explosion-proof solenoid valve for limiting a maximum surface temperature according to one embodiment of the present invention comprises: a body having a channel through which a fluid moves; a housing connected to the body and having one side open; a solenoid assembly disposed inside the housing and electrically connected to a controller; an armature having at least a portion disposed in the channel and opening and closing the channel by moving relative to the solenoid assembly by means of a magnetic field formed by the solenoid assembly; a cover plate disposed on one side of the housing so as to face the armature; and a temperature control member disposed on one side of the solenoid assembly to control the maximum surface temperature of the solenoid valve.

Description

Technology Field

[0001] The present invention relates to a solenoid valve, and more specifically, to an explosion-proof solenoid valve that limits the maximum surface temperature and a fuel supply system including the same. Background Technology

[0002] Solenoid valves regulate fluid flow by generating a magnetic field through a cylindrical coil and moving a mover. Currently, most electronic valves are solenoid valves, controlling fluid flow by manipulating the magnetic field via remote control. Solenoid valves are used in various fields, including hydraulic or pneumatic equipment, machinery, automobiles, electrical devices, chemistry, and medicine.

[0003] Solenoid valves are also used as gas supply valves for large-capacity marine engines; by controlling the on / off state of the solenoid valve, gaseous fuel is supplied into the cylinder, inducing an explosion to generate power. Due to the extremely high flow rates of gas supplied to marine engines, the performance and safety of solenoid valves are strictly regulated.

[0004] As a result, until 2016, gas supply valves that had obtained classification society certification could be applied to large-capacity marine engines, but from January 2017, only gas supply valves that have obtained international explosion-proof certification (IECEx) for use in hazardous area Zone 0 can be applied to large-capacity marine engines.

[0005] In other words, in order to install a gas supply valve in a location (Zone 0) where a hazardous atmosphere exists continuously or for a long period of time, it must obtain an Equipment Protection Level (EPL) Ga in an explosive gas atmosphere.

[0006] However, due to technical difficulties, gas supply valves equipped with solenoids that satisfy these international explosion-proof certifications have not yet been developed; therefore, the current situation is that exceptions to the relevant regulations are being applied to gas supply valves that have already obtained classification society certifications.

[0007] In addition, an explosion-proof design is required to additionally ensure safety against explosions by limiting the maximum surface temperature of gas supply valves used in hazardous atmospheres to below a certain temperature rating.

[0008] The aforementioned background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot be considered as publicly known technology disclosed to the general public prior to the filing of the present invention. Prior art literature

[0009] Japanese Registered Utility Model Publication No. 2597378 The problem to be solved

[0010] The present invention, as an invention to solve the aforementioned problems, can provide a solenoid valve having an explosion-proof structure capable of securing superior performance and safety compared to conventional solenoid valves, and a fuel supply system including the same.

[0011] In addition, by limiting the maximum surface temperature of the solenoid assembly, it is possible to provide an explosion-proof solenoid valve and fuel supply system that can improve explosion safety.

[0012] However, these problems are exemplary, and the problems to be solved by the present invention are not limited thereto. means of solving the problem

[0013] An explosion-proof solenoid valve capable of limiting the maximum surface temperature according to one embodiment of the present invention comprises: a body having a channel through which fluid moves; a housing connected to the body and having one side open; a solenoid assembly disposed inside the housing and electrically connected to a controller; an armature having at least a portion disposed in the channel and opening and closing the channel by moving relative to the solenoid assembly by a magnetic field formed by the solenoid assembly; a cover plate disposed on one side of the housing so as to face the armature; and a temperature control member disposed on one side of the solenoid assembly.

[0014] In an explosion-proof solenoid valve capable of limiting the maximum surface temperature according to one embodiment of the present invention, the solenoid assembly has the bottom surface of the core positioned through the cover plate and the top surface of the core positioned inside the housing, and the temperature control member is positioned on the top surface of the core of the solenoid assembly to control the external surface temperature of the solenoid valve.

[0015] In an explosion-proof solenoid valve capable of limiting the maximum surface temperature according to one embodiment of the present invention, the temperature control member is a temperature fuse having two wires, one end of the wire is directly connected to an external power source, and the other end of the wire is directly connected to a coil of a solenoid assembly so that it is connected to an external power source and wound onto the coil of the solenoid assembly to form a closed circuit.

[0016] In an explosion-proof solenoid valve capable of limiting the maximum surface temperature according to one embodiment of the present invention, the temperature control member can cut off power supplied to the solenoid assembly by opening the electrical circuit of the solenoid when the external surface temperature of the solenoid assembly reaches a preset temperature.

[0017] A fuel supply system according to one embodiment of the present invention comprises an engine, a fuel supply manifold and an air supply manifold that supply fuel and air to the engine, respectively, a solenoid valve that opens and closes the space between the fuel supply manifold and the air supply manifold, and a controller that controls the solenoid valve, the fuel supply system comprising: a body having a channel through which fluid moves; a housing connected to the body and having one side open; a solenoid assembly disposed inside the housing and electrically connected to the controller; an armature having at least a portion disposed in the channel and opening and closing the channel by moving relative to the solenoid assembly by means of a magnetic field formed by the solenoid assembly; a cover plate disposed on one side of the housing so as to face the armature; and a temperature control member disposed on one side of the core of the solenoid assembly to control the external surface temperature of the solenoid valve.

[0018] Other aspects, features, and advantages other than those described above will become clear from the following specific details, claims, and drawings for implementing the invention. Effects of the invention

[0019] The present invention can achieve flameproof protection by covering one side of the housing with a cover plate, separate from filling the interior of the housing with a separate explosion-proof material such as epoxy.

[0020] The present invention positions the bottom surface of the solenoid assembly and the cover plate on the same plane, thereby minimizing the gap between the solenoid assembly and the armature. Accordingly, the magnetic force exerted between the solenoid assembly and the armature is increased, allowing the solenoid valve to operate smoothly. Brief explanation of the drawing

[0021] FIG. 1 shows a fuel supply system according to one embodiment of the present invention. FIGS. 2 and FIGS. 3 show the operating state of a solenoid valve according to one embodiment of the present invention. Figure 4 shows an enlarged view of A in Figure 2. FIG. 5 shows an enlarged view of a portion of a solenoid valve according to one embodiment of the present invention. FIG. 6 shows a disassembled solenoid valve according to one embodiment of the present invention. FIG. 7 shows a temperature control member mounted on a solenoid assembly according to one embodiment of the present invention. FIGS. 8A and FIGS. 8B show an electrical circuit formed by a temperature control member according to one embodiment of the present invention. Specific details for implementing the invention

[0022] The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the description of the invention. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. In describing the present invention, the same identification numerals are used for identical components, even if they are illustrated in different embodiments.

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted.

[0024] In the following embodiments, terms such as first, second, etc. are used not in a limiting sense, but for the purpose of distinguishing one component from another component.

[0025] In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0026] In the following embodiments, terms such as "include" or "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added.

[0027] In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is illustrated.

[0028] In the following embodiments, the x-axis, y-axis, and z-axis are not limited to three axes in an orthogonal coordinate system and can be interpreted in a broader sense that includes them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but they may also refer to different directions that are not orthogonal to each other.

[0029] Where an embodiment can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the description.

[0030] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. In this application, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0032] FIG. 1 shows a fuel supply system (10) according to one embodiment of the present invention, FIG. 2 and FIG. 3 show the operating state of a solenoid valve (100) according to one embodiment of the present invention, FIG. 4 shows an enlarged view of A in FIG. 2, FIG. 5 shows an enlarged view of a part of the solenoid valve (100) according to one embodiment of the present invention, and FIG. 6 shows a disassembled view of a part of the solenoid valve (100) according to one embodiment of the present invention.

[0033] A solenoid valve (100) according to one embodiment of the present invention may be included in a fuel supply system (10). For example, the solenoid valve (100) may be placed in a fuel supply system (10) for supplying fuel to an engine for a ship, an aircraft, or an automobile, and may control the operation of supplying fuel to the engine.

[0034] In one embodiment, a solenoid valve (100) and a fuel supply system (10) including the same can be used in an explosive gas atmosphere. More specifically, the solenoid valve (100) and the fuel supply system including the same can be used in a hazardous area zone 0 (a place where a hazardous atmosphere exists continuously or for a long period, such as inside a container, inside a device and piping, etc.) as defined by International Explosion-Proof Certification (IECEx).

[0035] Referring to FIG. 1, a fuel supply system (10) according to one embodiment of the present invention may include a solenoid valve (100), an engine (200), and a controller (300).

[0036] The solenoid valve (100) can control the output of the engine (200) by controlling the flow rate of fuel supplied to the engine (200). In one embodiment, the solenoid valve (100) may be an electronic solenoid valve controlled by a controller (300). The solenoid valve (100) will be described later.

[0037] The engine (200) receives fuel and air to produce output. The type of engine (200) is not specifically limited and may be a marine engine, an aircraft engine, or an automobile engine.

[0038] In one embodiment, the engine (200) may include a fuel supply manifold (210), an air supply manifold (220), and an exhaust manifold (230).

[0039] The fuel supply manifold (210) connects a fuel tank (not shown) and a solenoid valve (100) and supplies fuel supplied from the fuel tank to the engine (200). The fuel supply manifold (210) can be opened and closed according to the operation of the solenoid valve (100).

[0040] The air supply manifold (220) receives air from an air tank (not shown) or from the outside and supplies it to the engine (200). FIG. 1 shows the fuel supply manifold (210) branching off from one side of the air supply manifold (220) and mixing after passing through the solenoid valve (100), but is not limited thereto. For example, the fuel supply manifold (210) and the air supply manifold (220) may not share a path with each other.

[0041] The exhaust manifold (230) exhausts the combustion gases of fuel and air to the outside.

[0042] The controller (300) is electrically connected to the solenoid valve (100). The controller (300) can control the amount of fuel supplied to the engine (200) by receiving a preset program or user instructions and controlling whether to open or close the solenoid valve (100) or the time of opening and closing. For example, the controller (300) can open and close the fuel supply manifold (210) by flowing current through the solenoid assembly (130) of the solenoid valve (100) to form a magnetic field.

[0043] Referring to FIGS. 2 to 6, a solenoid valve (100) according to one embodiment of the present invention may include a body (110), a housing (120), a solenoid assembly (130), an armature (140), a cover plate (150), and a temperature control member (160).

[0044] In the following description, the housing (120) and the solenoid assembly (130) are distinguished to aid in understanding the invention, but the housing (120) and the solenoid assembly (130) may form a single assembly.

[0045] The body (110) may have a channel (C) through which a fluid (e.g., fuel or air) travels. For example, as shown in FIG. 2, the body (110) may have an inlet (111) connected to a fuel supply manifold (210) and an outlet (112) connected to a portion where the fuel supply manifold (210) meets the air supply manifold (220). Accordingly, fuel introduced into the fuel supply manifold (210) while the solenoid valve (100) is open may travel along the channel (C) and then enter the air supply manifold (220) through the outlet (112).

[0046] The housing (120) is connected to the body (110) and may have an internal space (121). A solenoid assembly (130), described later, may be placed in the internal space (121). In one embodiment, the housing (120) may have a central axis Ax1.

[0047] In one embodiment, the housing (120) may have one side open. For example, as shown in FIG. 2, the housing (120) may have one side open that is in contact with the internal space (121). The one side may be positioned to face the armature (140) described later and may be covered by a cover plate (150).

[0048] In one embodiment, the housing (120) may have a cable (122) inside that is connected to the controller (300). The cable (122) connects the controller (300) and the solenoid assembly (130) and may allow current to flow through the solenoid assembly (130) to form a magnetic field.

[0049] The solenoid assembly (130) is placed in the internal space (121) of the housing (120) and can be electrically connected to the controller (300). For example, as shown in FIG. 2, the solenoid assembly (130) can be placed on the same plane as one end of the housing (120) so as to face the armature (140) described later. That is, the bottom surface of the solenoid assembly (130) can be placed on the same plane as one side of the housing (120).

[0050] In addition, one side of the solenoid assembly (130) can be connected to a cable (122).

[0051] In one embodiment, the solenoid assembly (130) may include a core (131) and a coil (132).

[0052] The core (131) is an electromagnet that generates magnetic force through a magnetic field generated by current flowing through the coil (132), and attracts or pushes the armature (140).

[0053] In one embodiment, the core (131) may include a mounting portion (131c) that forms a step with the bottom surface of the solenoid assembly (130). For example, as shown in FIG. 6, the core (131) may include a plurality of protrusions (131a) and a recess (131b) positioned between the protrusions (131a). The mounting portion (131c) may be recessed inward along the edge of the bottom surface of the protrusions (131a) to form a step with the bottom surface of the protrusions (131a). Accordingly, the slot (151) of the cover plate (150), which will be described later, can be fitted into the mounting portion (131c).

[0054] The drawing shows three protrusions (131a) having different areas and two concave parts (131b) placed between them, but the number, shape, size, etc. of the protrusions (131a) and concave parts (131b) are not specifically limited.

[0055] The coil (132) is wound around an insulator (133) and fitted into a core (131), and forms a magnetic field when current is applied. For example, the coil (132) wound around the insulator (133) can be wound around at least one of a plurality of protrusions (131a) and inserted into the interior of a recess (131b).

[0056] At least a portion of the armature (140) is positioned in the channel (C) of the body (110). In one embodiment, the armature (140) may be positioned coaxially with the central axis Ax1.

[0057] The armature (140) is a magnetic member made of metal, and when the solenoid assembly (130) forms a magnetic field, it moves relative to the solenoid assembly (130) accordingly to open and close the channel (C). This will be described later.

[0058] The cover plate (150) is positioned to face the armature (140) to close one side of the housing (120) while exposing at least a portion of the solenoid assembly (130). For example, as shown in FIGS. 2 and 6, the cover plate (150) may be positioned in contact with the inner wall of the housing (120) to cover the open side of the housing (120). Additionally, at least a portion of the solenoid assembly (130) may be positioned through the cover plate (150).

[0059] In FIG. 6, the shape of the cover plate (150) is shown as a disc, but it is not limited thereto and may have an appropriate shape depending on the housing (120).

[0060] In one embodiment, the cover plate (150) may share a central axis Ax2 with the solenoid assembly (130) (core (131)). Here, the central axis Ax2 may be coaxial with the central axis Ax1.

[0061] In one embodiment, the cover plate (150) may include a slot (151). For example, as shown in FIGS. 5 and 6, the slot (151) is formed on one side of the cover plate (150) and may have a shape corresponding to the mounting portion (131c) of the core (131). Accordingly, when the cover plate (150) is mounted on the solenoid assembly (130), a portion of the protrusion (131a) of the core (131), for example, the bottom surface, is exposed to the outside through the slot (151), and the remaining area of ​​the core (131) can be covered by the cover plate (150).

[0062] Through this configuration, the gap between the bottom surface of the solenoid assembly (130) and the top surface of the armature (140) is minimized, thereby ensuring that the strength of the magnetic force exerted by the solenoid assembly (130) on the armature (140) is at least a certain level.

[0063] FIGS. 5 and FIGS. 6 show three slots (151) having different areas, but the number, area, shape, etc. are not specifically limited and can correspond to the shape of the core (131).

[0064] In one embodiment, the thickness T of the cover plate (150) may be equal to the depth D of the mounting portion (131c). Accordingly, as shown in FIG. 5, with the slot (151) fitted into the mounting portion (131c), the cover plate (150) may be positioned on a plane P that is the same as the bottom surface of the solenoid assembly (130) (the bottom surface of the protrusion (131a)). Here, plane P may be a plane parallel to the XZ plane.

[0065] Therefore, if the cover plate does not have a slot, the gap between the solenoid assembly and the armature increases by the thickness of the cover plate, and as the gap increases, the magnetic force decreases. However, the solenoid valve (100) according to one embodiment of the present invention exposes the core (131) to the outside through the slot (151) and minimizes the gap between the bottom surface of the core (131) and the armature (140), thereby maximizing the use of the magnetic force generated in the solenoid assembly (130) so that the solenoid valve (100) can operate smoothly.

[0066] In one embodiment, an air gap may be placed between the solenoid assembly (130) or cover plate (150) and the armature (140).

[0067] A temperature control member (160) is positioned on one side of the solenoid assembly (130) to limit the maximum surface temperature of the solenoid valve (100).

[0068] As shown in FIG. 7 in one embodiment, the temperature control member (160) may be placed on the upper surface of the solenoid assembly (130). As described above, the bottom surface of the solenoid assembly (130) is placed through the cover plate (150), and the upper surface of the solenoid assembly (130) may be placed inside the housing (120). The temperature control member (160) may be placed on the upper surface of the solenoid assembly (130) through a bracket and bolts, etc.

[0069] In one embodiment, the temperature control member (160) may be a temperature fuse having wires. More specifically, the temperature control member (160) may have a temperature fuse that opens an electrical circuit when a certain temperature is reached, and two wires connected in series to the temperature fuse. The temperature fuse may melt or deform when the temperature reaches a preset temperature, thereby interrupting the connection between the wires. The two wires connected in series to the temperature fuse are each connected in series to an external power source and a coil of a solenoid assembly (130) to form an electrical circuit, thereby supplying current to the solenoid assembly (130).

[0070] In one embodiment, the temperature control member (160) can form a closed circuit by connecting one end of the two wires to an external power source and the other end to a coil (132) of the solenoid assembly (130) in series with the external power source. For example, the coil (132) of the solenoid assembly (130), the temperature control member (160), and the external power source can form an electrical circuit as shown in FIGS. 8a and FIGS. 8b. Accordingly, when the temperature of the solenoid assembly (130) reaches a preset temperature, the connection between the solenoid assembly (130) and the external power source is cut off by the temperature control member (160), and the supply of current is interrupted, causing the temperature of the solenoid assembly (130) to drop again.

[0071] More specifically, as shown in FIG. 8a, when the temperature control member (160) is not operating, that is, when the temperature of the solenoid assembly (130) does not reach a preset temperature (maximum surface temperature) and the temperature fuse is not melted or deformed, the electrical circuit formed by the coil (132) of the solenoid assembly (130), the temperature control member (160), and the external power source remains in the ON state, so that current is supplied to the coil (132) and the solenoid valve operates normally.

[0072] However, in a failure mode where the temperature of the solenoid assembly (130) exceeds a preset limit temperature (maximum surface temperature) due to a malfunction of the controller (300), the temperature control member (160) is activated. That is, the temperature fuse melts or deforms, causing the temperature fuse to operate, thereby turning off the electrical circuit formed by the coil (132) of the solenoid assembly (130), the temperature control member (160), and the external power source. Accordingly, the current supplied to the coil (132) is cut off, thereby allowing the surface temperature of the solenoid assembly (130) to be maintained below the preset limit temperature.

[0073] Meanwhile, since the bottom surface of the solenoid assembly (130) is positioned through the cover plate (150), a portion of the core (131) is exposed to the outside. Therefore, even when the temperature control member (160) is positioned on the upper surface of the solenoid assembly (130), it is possible to measure a temperature that is substantially the same as or nearly similar to the external surface temperature of the solenoid valve (100).

[0074] The limiting temperature of the temperature control member (160) is not specifically limited. An appropriate temperature may be selected by considering the location and position where the solenoid valve (100) is installed or the material of the solenoid valve (100). For example, the limiting temperature of the temperature control member (160) may be a temperature that satisfies the temperature rating of the device required by the International Explosion-Proof Certification (IECEx).

[0075] The type of temperature control member (160) is not specifically limited. For example, the temperature fuse of the temperature control member (160) may be a bimetal fuse made of metals with different coefficients of thermal expansion, or a permanent cutting fuse that melts when a specific temperature is reached.

[0076] Through such a configuration, the solenoid valve (100) according to one embodiment of the present invention can prevent the temperature of the solenoid assembly (130) from rising above the limit temperature (maximum surface temperature) due to a malfunction of the controller (300), etc.

[0077] In addition, the solenoid valve (100) according to one embodiment of the present invention places the temperature control member (160) on the inner surface of the solenoid assembly (130), thereby eliminating the need to secure additional space for installing the temperature control member (160) and simplifying the installation process.

[0078] In addition, in a solenoid valve (100) according to one embodiment of the present invention, the bottom surface of the core (131) of the solenoid assembly (130) is positioned to penetrate the cover plate (150). Therefore, unlike the case where the bottom surface of the core (131) of the solenoid assembly (130) is shielded by another member, the bottom surface of the core (131) of the solenoid assembly (130) is exposed to the outside, and the bottom surface of the core (131) of the solenoid assembly (130) becomes the outer surface of the solenoid. Accordingly, the temperature control member (160) can measure a temperature that is substantially the same or nearly similar to the outer surface temperature of the solenoid valve (100) even when positioned on the upper surface of the solenoid assembly (130), that is, when positioned inside the housing (120).

[0079] The operation of a solenoid valve (100) according to one embodiment of the present invention will be explained with reference to FIGS. 2 and FIGS. 3.

[0080] FIG. 2 shows the channel (C) in an open state. First, when current flows through the solenoid assembly (130) by the controller (300), the armature (140) is pulled toward the solenoid assembly (130) by the magnetic field formed by the solenoid assembly (130). Accordingly, the bottom surface of the solenoid assembly (130) and the top surface of the armature (140) can be separated by a gap G1 as shown in FIG. 4.

[0081] Here, the fixed plate (171) is positioned inside the body (110) so as to face one end of the housing (120), and the armature (140) is connected to the movable plate (173) by a connecting member (179). Accordingly, when the armature (140) moves toward the solenoid assembly (130), the movable plate (173) also moves upward together, and a gap is formed between the movable plate (173) and the exhaust plate (181). Thus, fuel introduced into the chamber (175) through the fuel supply manifold (210) passes through the gap between the movable plate (173) and the exhaust plate (181) and enters the air supply manifold (220) through the outlet (112).

[0082] However, the method of transferring fuel to the air supply manifold (220) is not specifically limited. For example, the transfer plate (173) may have a plurality of first holes (183), and the exhaust plate (181) may have a plurality of second holes (185). Additionally, the exhaust plate (181) may have an exhaust hole (not shown in the drawing) connected to the air supply manifold (220).

[0083] As shown in FIG. 2, in a solenoid valve (100) according to one embodiment of the present invention, at least a portion of the solenoid assembly (130) is positioned to pass through the cover plate (150). That is, with the cover plate (150) mounted on the solenoid assembly (130), the bottom surface of the core (131) is exposed to the outside through the slot (151), and the bottom surface of the core (131) can be located on the same plane as the cover plate (150). Accordingly, the gap G1 between the core (131) and the armature (140) can be minimized, thereby increasing the magnetic force between the solenoid assembly (130) and the armature (140).

[0084] Figure 3 shows the channel (C) in a closed state. When current does not flow through the solenoid assembly (130) by the controller (300), the magnetic field pulling the armature (140) disappears, and the armature (140) moves downward by the elastic member (177). Accordingly, the bottom surface of the solenoid assembly (130) and the top surface of the armature (140) can be separated by a gap G2 as shown in Figure 4.

[0085] At this time, the elastic member (177) inserted inside the fixed plate (171) is compressed while the armature (140) is moved upward, and when the magnetic field disappears, it extends to press the moving plate (173) downward, thereby allowing the moving plate (173) to move quickly. Accordingly, the lower surface of the moving plate (173) comes into close contact with the exhaust plate (181), so that the channel (C) can be closed.

[0086] In one embodiment, the solenoid valve (100) can be welded between the slot (151), the mounting portion (131c), and the inner wall of the housing (120) while the cover plate (150) is fitted into the mounting portion (131c). More specifically, the slot (151) of the cover plate (150) is mounted on the mounting portion (131c) of the core (131), and the mounting portion (131c) and the slot (151) are welded together, and the outer surface of the cover plate (150) and the inner wall of the housing (120) are welded together, thereby allowing the cover plate (150) to be firmly attached and maintaining airtightness.

[0087] In one embodiment, the surface of the cover plate (150) can be ground while mounted on the mounting portion (131c). Accordingly, fine irregularities on the surface of the cover plate (150) and the core (131) can be removed, the step difference caused during the mounting process can be reduced, and weld beads caused during the welding process can be removed. Thus, the step difference between the outer surface of the cover plate (150) and the bottom surface of the protrusion (131a) can be minimized, so that the cover plate (150) and the bottom surface of the protrusion (131a) can ultimately be positioned on the same plane.

[0088] Through such a configuration, the solenoid valve (100) according to one embodiment of the present invention can achieve flameproof protection by covering one side of the housing (120) with a cover plate (150), separate from filling the inside of the housing (120) with a separate explosion-proof material such as epoxy.

[0089] In addition, a solenoid valve (100) according to one embodiment of the present invention may minimize the gap between the solenoid assembly (130) and the armature (140) by positioning the bottom surface of the solenoid assembly (130) and the cover plate (150) on the same plane. Accordingly, the magnetic force exerted between the solenoid assembly (130) and the armature (140) is increased, thereby enabling the solenoid valve (100) to operate smoothly.

[0090] Next, a method for manufacturing a solenoid valve (100) according to one embodiment of the present invention is described.

[0091] A method for manufacturing a solenoid valve (100) according to one embodiment of the present invention may include the steps of fixing a solenoid assembly (130) including a core (131) and a coil (132) inside a housing (120), fixing a cover plate (150) inside the housing (120), mounting the cover plate (150) to the solenoid assembly (130), welding the housing (120), the solenoid assembly (130), and the cover plate (150), and grinding the surface of the cover plate (150).

[0092] First, the solenoid assembly (130) is fixed inside the housing (120). Here, the core (131) of the solenoid assembly (130) can be integrated into a single core (131) by laminating and welding multiple core members.

[0093] The method of fixing the solenoid assembly (130) to the housing (120) is not particularly limited. For example, the outer surface of the solenoid assembly (130) and the inner surface of the housing (120) can be connected using a fixing member (not shown in drawing) as shown in FIG. 2.

[0094] Next, the slot (151) of the cover plate (150) is mounted to the mounting portion (131c) of the core (131). Accordingly, the open side of the housing (120) is closed, and the bottom surface of the core (131) can be exposed through the slot (151). That is, the bottom surface of the core (131) can be positioned through the cover plate (150).

[0095] Next, the housing (120), solenoid assembly (130), and cover plate (150) are welded. For example, the inner wall of the housing (120) and the outer surface of the cover plate (150) are welded, and the mounting portion (131c) and the slot (151) are welded. Accordingly, the cover plate (150) can be mounted more securely to the housing (120) and airtightness can be maintained.

[0096] In one embodiment, the welding method used to integrate the core (131) or weld the cover plate (150) is not particularly limited, and any one of various welding methods such as arc welding, gas welding, laser welding, friction welding, and cold welding may be used.

[0097] Next, the cover plate (150) is ground. The surface of the cover plate (150) may have irregularities that are difficult to observe with the naked eye, and there may also be weld beads generated during the welding process or a step difference between the surface of the cover plate (150) and the bottom surface of the protrusion (131a). Accordingly, the surface of the cover plate (150) is ground so that the bottom surface of the cover plate (150) and the solenoid assembly (130) are positioned on the same plane.

[0098] In one embodiment, the method may further include the step of placing a temperature control member (160) on the upper surface of a solenoid assembly (130). For example, with the temperature control member (160) placed on the upper surface of the solenoid assembly (130), a bracket is placed to secure a part of the temperature control member (160), for example, a temperature fuse. Then, the temperature control member (160) is secured to the upper surface of the solenoid assembly (130) by fixing the bracket with bolts.

[0099] The present invention can achieve flameproof protection by covering one side of the housing (120) with a cover plate (150), separate from filling the interior of the housing (120) with a separate explosion-proof material such as epoxy. That is, even if gas leaks into the interior of the housing (120) and sparks or the like occur inside, causing a flame or explosion, the cover plate (150) blocks the flame from spreading to the outside, thereby enabling the implementation of an explosion-proof structure.

[0100] The present invention allows the bottom surface of the solenoid assembly (130) and the cover plate (150) to be positioned on the same plane, thereby minimizing the gap between the solenoid assembly (130) and the armature (140). Accordingly, the magnetic force exerted between the solenoid assembly (130) and the armature (140) is increased, allowing the solenoid valve (100) to operate smoothly.

[0101] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative. Those skilled in the art will fully understand that various modifications and equivalent alternative embodiments are possible from the embodiments. Accordingly, the true technical scope of protection of the present invention should be determined based on the appended claims.

[0102] The specific technical details described in the embodiments are merely examples and do not limit the technical scope of the embodiments. To make the description of the invention concise and clear, descriptions of general prior art and configurations may be omitted. Furthermore, the connections of lines or connecting members between components depicted in the drawings are illustrative of functional connections and / or physical or circuit connections, and may be replaced or represented by various additional functional, physical, or circuit connections in actual devices. Additionally, unless specifically stated with terms such as "essential" or "importantly," a component may not be strictly necessary for the application of the present invention.

[0103] The term "the above" or similar designations in the description of the invention and claims may refer to both singular and plural forms unless specifically limited otherwise. Furthermore, where a range is described in the embodiments, it is considered to include the invention with respect to individual values ​​within said range (unless otherwise stated), and is equivalent to describing each individual value constituting said range in the description of the invention. Additionally, regarding the steps constituting the method according to the embodiments, the steps may be performed in a suitable order unless explicitly stated or otherwise stated. The embodiments are not necessarily limited by the order in which the steps are described. The use of all examples or exemplary terms (e.g., etc.) in the embodiments is merely for the purpose of describing the embodiments in detail, and the scope of the embodiments is not limited by said examples or exemplary terms unless otherwise limited by the claims. Furthermore, a person skilled in the art will understand that various modifications, combinations, and changes may be made according to design conditions and factors within the scope of the claims or equivalents to which they are added. Explanation of the symbols

[0104] 10: Fuel supply system 100: Solenoid valve 110: Body 120: Housing 130: Solenoid Assembly 140: Amateur 150: Cover plate

Claims

Claim 1 A solenoid valve comprising: a body having a channel through which a fluid travels; a housing connected to the body and having one side open; a solenoid assembly disposed inside the housing and electrically connected to a controller; an armature having at least a portion disposed in the channel and opening and closing the channel by moving relative to the solenoid assembly by a magnetic field formed by the solenoid assembly; a cover plate disposed on one side of the housing so as to face the armature; and a temperature control member disposed on one side of the solenoid assembly; wherein the solenoid assembly comprises a coil, a core, and an insulator, the coil is wound around the insulator and inserted into the core, the cover plate covers the coil and exposes the core, and the cover plate is disposed on the same plane as the bottom surface of the core so as to maintain a non-contact state between the bottom surface of the core and the armature. Claim 2 A solenoid valve according to claim 1, wherein the solenoid assembly has a bottom surface disposed penetrating the cover plate and a top surface disposed inside the housing, and the temperature control member is disposed on the top surface of the solenoid assembly to limit the maximum surface temperature of the solenoid valve. Claim 3 In claim 1, the temperature control member is a temperature fuse assembly having a wire, wherein one end of the wire is directly connected to an external power source and the other end is directly connected to a coil of a solenoid assembly to form a closed circuit with the external power source, a solenoid valve. Claim 4 delete Claim 5 A fuel supply system comprising an engine, a fuel supply manifold and an air supply manifold that supply fuel and air to the engine, respectively, a solenoid valve that opens and closes the space between the fuel supply manifold and the air supply manifold, and a controller that controls the solenoid valve, the system comprising: a body having a channel through which a fluid moves; a housing connected to the body and having one side open; a solenoid assembly disposed inside the housing and electrically connected to the controller; an armature having at least a portion disposed in the channel and opening and closing the channel by moving relative to the solenoid assembly by means of a magnetic field formed by the solenoid assembly; and a cover plate disposed on one side of the housing so as to face the armature. A fuel supply system comprising: a temperature control member disposed on one side of the solenoid assembly and controlling the maximum surface temperature of the solenoid valve; wherein the solenoid assembly comprises a coil, a core, and an insulator, the coil is wound around the insulator and inserted into the core, the cover plate covers the coil and exposes the core, and the cover plate is disposed on the same plane as the bottom surface of the core so as to maintain a non-contact state between the bottom surface of the core and the armature.

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