Electromagnetic valve and gas equipment

Abstract

The utility model belongs to the technical field of fuel gas equipment, and particularly discloses an electromagnetic valve and fuel gas equipment. The electromagnetic valve comprises an electromagnetic assembly, a valve seat, a first sealing assembly and a second sealing assembly. The valve seat defines an inner cavity and is provided with an air inlet and an air outlet which are communicated with the inner cavity; a first valve element of the first sealing assembly is axially and movably installed in the containing groove, and one end of the first valve element extends into the inner cavity. The first elastic piece is used for pushing the first valve element to abut against the valve seat in a sealed mode to block the air outlet. A mounting cavity is formed in the first valve element; a second valve element of the second sealing assembly can be axially and movably mounted in the mounting cavity, and one end of the second valve element extends into the inner cavity; the second elastic piece is used for pushing the second valve element to abut against the valve seat in a sealed mode to block the air outlet. When the electromagnetic assembly is powered on, the electromagnetic assembly is used for driving the first valve element and the second valve element to move in the axial direction so that the first valve element and the second valve element can open the air outlet. According to the electromagnetic valve, the gas leakage risk in the fault state can be reduced, the sealing performance is good, and the safety of gas equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas equipment, in particular to a solenoid valve and a gas equipment. Background Art

[0002] Solenoid valves are widely used in various valve devices that control the on-off of gas channels. When the solenoid valve is working, the electromagnetic force generated by the electromagnetic coil is energized to drive the valve core to move and open the valve. When it is not working, the spring force is used to reset the valve core and close the valve, so that the gas channel can switch between on and off states. In order to ensure safety, the solenoid valve is required to quickly reset the valve core and close the valve when the electromagnetic coil is powered off. However, in actual use, the solenoid valve often has risk factors such as iron core jamming and spring failure, which results in the valve core failing to reset normally after the electromagnetic coil is powered off, causing gas leakage, which in turn causes serious safety accidents and reduces the safety of the gas solenoid valve. Utility Model Content

[0003] The first technical problem solved by the utility model is to provide a solenoid valve, which can improve the existing solenoid valves having risk factors such as iron core sticking, spring failure, etc., which cannot be reset normally and cause gas leakage, and the problem of insufficient safety.

[0004] The second technical problem solved by the utility model is to provide a gas device, which has a solenoid valve that can improve the problem of the existing solenoid valve being unable to reset normally and gas leakage due to core sticking, spring failure, etc., avoid safety accidents and improve the safety of the gas equipment.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] Provided is a solenoid valve, comprising:

[0007] An electromagnetic assembly having a receiving slot;

[0008] A valve seat is mounted on the electromagnetic assembly, the valve seat and the electromagnetic assembly enclose an inner cavity, and the valve seat is provided with an air inlet and an air outlet communicating with the inner cavity;

[0009] A first sealing assembly includes a first valve core and a first elastic member, wherein the first valve core can be axially movably installed in the accommodating groove, and one end of the first valve core extends into the inner cavity; the first elastic member is connected to the first valve core, and the first elastic member is used to push the first valve core to seal against the valve seat to block the air outlet; the first valve core is provided with an installation cavity;

[0010] A second sealing assembly includes a second valve core and a second elastic member, wherein the second valve core can be axially movably installed in the installation cavity, and one end thereof extends into the inner cavity; the first valve core is arranged around the periphery of the second valve core; the second elastic member is connected to the second valve core, and the second elastic member is used to push the second valve core to seal against the valve seat to block the air outlet;

[0011] When the electromagnetic assembly is powered on, it is used to drive the first valve core and the second valve core to move in the axial direction, so that the first valve core and the second valve core open the air outlet.

[0012] Compared with the background technology, the solenoid valve described in the utility model has the following beneficial effects: when the solenoid assembly is energized, the solenoid assembly drives the first valve core and the second valve core to move axially, so that the first sealing assembly and the second sealing assembly are opened, forming the open valve state of the solenoid valve. Among them, by setting the first sealing assembly and the second sealing assembly that work independently of each other, for example, when the first sealing assembly fails due to stagnation or failure of the elastic member, the second valve core can block the air outlet under the action of the second elastic member; when the second sealing assembly fails due to stagnation or failure of the elastic member, the first valve core can still block the air outlet under the action of the first elastic member, thereby effectively reducing the problem of gas leakage caused by the failure of the first valve core or the second valve core to reset and close the valve normally, and improving the safety of the gas solenoid valve. Moreover, in the normally closed state, the first valve core and the second valve core form a double seal, further improving the safety performance of the solenoid valve.

[0013] In one embodiment, the first valve core includes a first sealing member and a first moving iron core connected to each other, the first moving iron core is inserted into the receiving groove, and the installation cavity is provided in the first moving iron core;

[0014] The second valve core includes a second sealing member and a second moving iron core which are connected to each other, and the second moving iron core is inserted into the installation cavity; the first sealing member is arranged around the periphery of the second sealing member, and the first sealing member and the second sealing member are used for sealing against the valve seat.

[0015] In one embodiment, the installation cavity passes through the first moving iron core, and the second moving iron core passes through the installation cavity.

[0016] In one embodiment, there is a gap between the first sealing member and the second sealing member, and a flexible sealing structure for sealing the gap is provided between the second valve core and the first valve core.

[0017] In one embodiment, the flexible sealing structure is a flexible diaphragm, the outer side of the flexible diaphragm is connected to the first sealing member, and the inner side of the flexible diaphragm is connected to the second sealing member; the width of the flexible diaphragm is greater than the width of the gap.

[0018] In one embodiment, the flexible membrane is integrally formed with the first sealing member and the second sealing member.

[0019] In one embodiment, the first valve core includes a connecting portion and a core shaft portion that are integrally formed, the core shaft portion is inserted into the accommodating groove, and the first sealing member is connected to the connecting portion.

[0020] In one embodiment, one end of the second elastic member is connected to the second valve core, and the other end is connected to the first valve core; or,

[0021] One end of the second elastic member is connected to the second valve core, and the other end is connected to the electromagnetic assembly.

[0022] In one of the embodiments, the valve seat is provided with a first sealing convex ring and a second sealing convex ring on the plane where the air outlet is located, the second sealing convex ring surrounds the air outlet, the first sealing convex ring is arranged around the periphery of the second sealing convex ring, the first valve core is used for sealingly abutting the first sealing convex ring, and the second valve core is used for sealingly abutting the second sealing convex ring.

[0023] The above second technical problem is solved by the following technical solution:

[0024] A gas device is provided, comprising the above-mentioned solenoid valve.

[0025] Compared with the background technology, the gas equipment described in the utility model has the following beneficial effects: the above-mentioned solenoid valve comprises two sets of independent sealing structures, the first valve core of the first sealing component is provided with an installation cavity, the second valve core of the second sealing component can be axially movably arranged in the installation cavity, the magnetic force of the solenoid component can simultaneously drive the first valve core and the second valve core to move axially to form an open valve state; after the solenoid component is powered off, the closing action of the first valve core and the second valve core is respectively controlled by their respective first elastic parts and the second elastic parts, which are independent of each other, thereby reducing the risk of gas leakage of the gas equipment when the solenoid valve is in a fault state, and the internal and external double sealing form formed by the first valve core and the second valve core in the normally closed state greatly improves the safety performance of the gas equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A cross-sectional view of the structure of the solenoid valve in the closed state provided by the embodiment of the utility model Figure 1 ;

[0027] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the structure in the middle;

[0028] Figure 3 A structural cross-sectional view of a solenoid valve in an open valve state provided by an embodiment of the utility model;

[0029] Figure 4 A partial structural schematic diagram of a solenoid valve provided in an embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the disassembly of the structure of the solenoid valve provided in the embodiment of the utility model;

[0031] Figure 6 A cross-sectional view of the structure of the solenoid valve in the closed state provided by the embodiment of the utility model Figure 2 ;

[0032] Figure 7 A cross-sectional view of the structure of the first moving iron core provided in the embodiment of the utility model Figure 1 ;

[0033] Figure 8 A cross-sectional view of the structure of the first moving iron core provided in the embodiment of the utility model Figure 1 ;

[0034] Fig. 9 A cross-sectional view of the structure of the solenoid valve in an abnormally closed state provided by the embodiment of the utility model Figure 1 ;

[0035] Fig.10 A cross-sectional view of the structure of the solenoid valve in an abnormally closed state provided by the embodiment of the utility model Figure 2 .

[0036] Description of labels:

[0037] 1. Electromagnetic assembly; 11. Electromagnetic coil; 12. Fixed iron core; 121. Second concavo-convex part; 122. Fourth concavo-convex part; 2. Valve seat; 21. Inner cavity; 22. Air inlet; 23. Air outlet; 24. First sealing convex ring; 25. Second sealing convex ring; 3. First sealing assembly; 31. First valve core; 311. Mounting cavity; 312. First sealing member; 313. First moving iron core; 3131. First concavo-convex part; 3132. Connecting part; 3133. Core shaft part; 32. First elastic member; 4. Second sealing assembly; 41. Second valve core; 411. Second sealing member; 412. Second moving iron core; 4121. Third concavo-convex part; 4122. Avoidance groove; 42. Second elastic member; 5. Fixed sleeve; 51. Mounting plate; 511. Annular limit ring; 6. Flexible diaphragm; 61. Flexible buffer part. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] In the description of the present application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] The terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] like Figure 1-Figure 10 As shown, the embodiment of the utility model first provides a solenoid valve, which includes an electromagnetic component 1, and the electromagnetic component 1 has a receiving groove. The electromagnetic component 1 can generate magnetic force when energized, and the magnetic force serves as a power source of the solenoid valve. The solenoid valve also includes a valve seat 2, a first sealing component 3 and a second sealing component 4. The valve seat 2 is installed on the electromagnetic component 1, and the valve seat 2 and the electromagnetic component 1 form an inner cavity 21. The valve seat 2 is provided with an air inlet 22 and an air outlet 23 connected to the inner cavity 21. The gas can enter the inner cavity 21 from the air inlet 22, and the gas in the inner cavity 21 can flow out from the air outlet 23. Figure 3 Indicated by the arrow.

[0043] The first sealing assembly 3 includes a first valve core 31 and a first elastic member 32. The first valve core 31 can be axially movably arranged in the receiving groove of the electromagnetic assembly 1, and one end thereof extends into the inner cavity 21. The first valve core 31 is connected to the first elastic member 32. The first elastic member 32 is used to push the first valve core 31 to seal against the valve seat 2 to block the air outlet 23. The first valve core 31 is provided with an installation cavity 311. The second sealing assembly 4 includes a second valve core 41 and a second elastic member 42. The second valve core 41 can be axially movably arranged in the installation cavity 311. The second elastic member 42 is connected to the second valve core 41. The second elastic member 42 is used to push the second valve core 41 to seal against the valve seat 2 to block the air outlet 23. Figure 1 shown.

[0044] When the electromagnetic assembly 1 is powered on, the magnetic force generated can simultaneously drive the first valve core 31 and the second valve core 41 to move axially, and the first valve core 31 and the second valve core 41 are both separated from the valve seat 2 so that the air inlet 22 and the air outlet 23 remain connected, forming an open valve state of the electromagnetic valve. Figure 3 As shown, the gas enters the inner cavity 21 from the air inlet 22 and flows out from the air outlet 23. The actions of the first valve core 31 and the second valve core 41 are independent of each other and are both controlled by the magnetic force of the electromagnetic component 1. The valve opening action is rapid, ensuring the sensitivity of the electromagnetic valve. After the electromagnetic component 1 is powered off, the closing action of the first valve core 31 and the second valve core 41 is controlled by their respective first elastic member 32 and second elastic member 42, which are independent of each other. If one of the first valve core 31 and the second valve core 41 is stuck, or one of the first elastic member 32 and the second elastic member 42 fails, the other of the first valve core 31 and the second valve core 41 can still be reset normally to block the air outlet 23 to complete the closed state of the electromagnetic valve, avoid gas leakage, and improve the safety of the electromagnetic valve. Moreover, in the normal closed state, the first valve core 31 and the second valve core 41 form a double seal, which greatly improves the safety performance of the electromagnetic valve.

[0045] Specifically, the electromagnetic assembly 1 includes an electromagnetic coil 11 and a fixed iron core 12. The fixed iron core 12 is arranged at one end of the first sealing assembly 3 and the second sealing assembly 4 away from the air inlet 22. The electromagnetic coil 11 is wound around the fixed iron core 12 and the outside of the first valve core 31. The first valve core 31 includes a first sealing member 312 and a first moving iron core 313 connected to each other. The installation cavity 311 penetrates the first sealing member 312 and extends into the first moving iron core 313. The second valve core 41 includes a second sealing member 411 and a second moving iron core 412 connected to each other. The second moving iron core 412 is inserted into the first moving iron core 313. The first sealing member 312 and the second sealing member 411 are used to seal against the valve seat 2. When the electromagnetic assembly 1 is powered on, the fixed iron core 12 generates a magnetic attraction. Under the action of the attraction, the fixed iron core 12 simultaneously causes the first moving iron core 313 and the second moving iron core 412 to move axially and separate from the valve seat 2, forming an open valve state of the electromagnetic valve.

[0046] The working principle of the electromagnetic coil 11 being energized to cause the fixed iron core 12 to generate magnetic attraction is a prior art in the art and will not be described in detail in this embodiment.

[0047] In one embodiment, both ends of the installation cavity 311 are through-connected and the ends are not blocked. The second moving iron core 412 passes through the installation cavity 311 to avoid mutual interference between the first sealing assembly 3 and the second sealing assembly 4. The magnetic attraction force of the fixed iron core 12 directly acts on the first moving iron core 313 and the second moving iron core 412.

[0048] In one embodiment, there is a gap between the first seal 312 and the second seal 411, and a flexible sealing structure for sealing the gap is provided between the first valve core 31 and the second valve core 41. The flexible sealing structure can isolate the gap between the first seal 312 and the second seal 411 from the inner cavity 21 to prevent the gas in the inner cavity 21 from entering the gap.

[0049] Specifically, the flexible sealing structure can adopt a flexible diaphragm 6, which is arranged around the second valve core 41 and extends radially along the second valve core 41 to abut against the first valve core 31 to seal the gap between the first valve core 31 and the second valve core 41, thereby improving the sealing performance of the solenoid valve. Fig. 9 As shown, when the second valve core 41 is stuck or the second elastic member 42 fails and the second sealing member 411 cannot be reset, the presence of the flexible diaphragm 6 can isolate the gap between the first valve core 31 and the second valve core 41 and the gas outlet 23, thereby preventing the gas from entering the gas outlet 23 through the gap between the first valve core 31 and the second valve core 41; in another abnormal closed state of the solenoid valve, such as Fig.10 As shown, when the first valve core 31 is stuck or the first elastic member 32 fails and the first sealing member 312 cannot be reset, the presence of the flexible diaphragm 6 can isolate the gap between the first valve core 31 and the second valve core 41 from the inner cavity 21, thereby preventing the gas from entering the gap between the first valve core 31 and the second valve core 41 and accumulating therebetween. The gas accumulated in the gap may flow along the gap between the first moving iron core 313 and the second moving iron core 412 and leak at the connection between other structural parts. Alternatively, the gas accumulated in the gap may leak from the gas outlet 23 when the second sealing member 411 is in an abnormal closed state where it cannot be reset.

[0050] In order to improve the sealing performance of the flexible diaphragm 6, the flexible diaphragm 6 has a flexible buffer portion 61. The flexible buffer portion 61 makes the width of the flexible diaphragm 6 larger than the gap width between the first valve core 31 and the second valve core 41. When the axial positions of the first valve core 31 and the second valve core 41 are different, that is, when the actions of the first valve core 31 and the second valve core 41 are not synchronized due to some faults, such as Fig. 9 and Fig.10As shown, the flexible buffer portion 61 can be expanded along the axial direction to avoid tearing of the flexible buffer portion 61 due to axial misalignment of the first valve core 31 and the second valve core 41. The cross-sectional shape of the flexible buffer portion 61 can be U-shaped, or multiple U-shaped structures formed by multiple folds are connected end to end to form an accordion-like structure, which can be expanded to a larger size, further increasing the flexibility of the flexible buffer portion 61.

[0051] Preferably, the flexible diaphragm 6 and the first seal 312 and the second seal 411 are integrally connected. The flexible diaphragm 6 and the first seal 312 and the second seal 411 are all made of flexible materials with reversible deformation properties such as rubber, and have good wear resistance and chemical corrosion resistance, and are suitable for the working environment of gas equipment. The flexible diaphragm 6 and the first seal 312 and the second seal 411 are integrally formed through a mold injection molding process, and have good structural strength. The inner edge of the flexible diaphragm 6 is fixedly connected to the outer peripheral wall of the second valve core 41, and the outer edge of the flexible diaphragm 6 is fixedly connected to the inner cavity wall of the first valve core 31. The flexible diaphragm 6 is preferably located between the first seal 312 and the second seal 411, and is close to the air outlet 23, so that the gap between the first valve core 31 and the second valve core 41 is completely isolated from the air outlet 23.

[0052] The solenoid valve further includes a fixed sleeve 5, the first moving iron core 313 is movably disposed at one end in the fixed sleeve 5, and the fixed iron core 12 is embedded in the other end in the fixed sleeve 5. The fixed sleeve 5 provides a guide space for the first moving iron core 313, improves the movement accuracy of the first valve core 31, and reduces the movement stagnation of the first valve core 31 and the second valve core 41. Preferably, the fixed sleeve 5 and the first moving iron core 313 are matched with a small gap.

[0053] In one embodiment, the end surface of the first moving iron core 313 has a first concave-convex portion 3131, and the top surface of the fixed iron core 12 has a second concave-convex portion 121. The first concave-convex portion 3131 and the second concave-convex portion 121 can be plugged together. This plug-in connection state is more reliable, and a stable adsorption connection is maintained between the fixed iron core 12 and the first moving iron core 313, and the solenoid valve can maintain an open valve state with a smaller voltage value.

[0054] In one embodiment, the end face of the second moving iron core 412 has a third concave-convex portion 4121, and the top surface of the fixed iron core 12 has a fourth concave-convex portion 122. The third concave-convex portion 4121 and the fourth concave-convex portion 122 can be plugged together. This plug-in connection state is more reliable, and a stable adsorption connection is maintained between the fixed iron core 12 and the second moving iron core 412, and the solenoid valve can maintain an open valve state with a smaller voltage value.

[0055] In one embodiment, along the axial direction, at least part of the first concavo-convex part 3131 and the second concavo-convex part 121 overlap in an interlaced manner, and / or, at least part of the third concavo-convex part 4121 and the fourth concavo-convex part 122 overlap in an interlaced manner. That is, in the closed state of the solenoid valve, the convex part of the first concavo-convex part 3131 extends toward the fixed iron core 12 to overlap with the second concavo-convex part 121 of the fixed iron core 12, and the convex part of the third concavo-convex part 4121 extends toward the fixed iron core 12 to overlap with the fourth concavo-convex part 122 of the fixed iron core 12, and these two overlapping structures have at least one of them, or the first concavo-convex part 3131 and the second concavo-convex part 121 overlap in an interlaced manner and at the same time the third concavo-convex part 4121 and the fourth concavo-convex part 122 overlap in an interlaced manner, such as Figure 1 and Figure 2 As shown in the figure, L is the axial overlap length of the first concavo-convex part 3131 and the second concavo-convex part 121 interlaced and overlapped, and the third concavo-convex part 4121 and the fourth concavo-convex part 122 interlaced and overlapped. In this way, the distance between the first moving iron core 313, the second moving iron core 412 and the fixed iron core 12 is further reduced, and the fixed iron core 12 can make the first moving iron core 313 and the second moving iron core 412 move with a relatively small magnetic attraction. The magnetic attraction of the fixed iron core 12 is related to the current of the electromagnetic coil 11, which reduces the valve opening voltage of the electromagnetic valve.

[0056] It should be noted that the first concave-convex portion 3131, the third concave-convex portion 4121, the second concave-convex portion 121 and the fourth concave-convex portion 122 may be as follows: Figure 1 The rectangular teeth shown may also be sawtooth, wavy or other concave-convex structures, and are not limited to the drawings of this embodiment. In some embodiments, the first concave-convex portion 3131 and the third concave-convex portion 4121 have the same cross-sectional shape, and correspondingly, the second concave-convex portion 121 and the fourth concave-convex portion 122 also have the same cross-sectional shape and are continuously connected.

[0057] In one embodiment, the end surface of the fixed sleeve 5 has a mounting plate 51, and the first elastic member 32 is a first spring, which is sleeved outside the first moving iron core 313, and one end of the first spring is connected to the first sealing member 312, and the other end is connected to the mounting plate 51. The first spring is a compression spring, and when the fixed sleeve 5 is a fixed end, the other end of the first spring always has a movement tendency to push the first sealing member 312 toward the air outlet 23 to block the air outlet 23. When the electromagnetic coil 11 is energized, the fixed iron core 12 generates a magnetic attraction force to move the first moving iron core 313 away from the air outlet 23, and the first elastic member 32 is compressed; when the electromagnetic coil 11 is de-energized, the magnetic attraction force of the fixed iron core 12 disappears, and at this time, the first moving iron core 313 is reset under the elastic reset force of the first elastic member 32 to block the air outlet 23.

[0058] In order to guide and limit the first elastic member 32, a guiding structure can be added to the mounting plate 51 or the first sealing member 312 to abut and limit the first elastic member 32. For example, a raised annular limiting ring 511 is provided on the mounting plate 51, such as Figure 5 As shown, the first elastic member 32 is arranged outside the annular limiting ring 511.

[0059] There are two ways to set the second elastic member 42. In one embodiment, the second elastic member 42 also adopts a compression spring, which is mounted outside the second moving iron core 412. One end of the second elastic member 42 is connected to the second sealing member 411, and the other end is connected to the first moving iron core 313. Since the installation cavity 311 penetrates the first sealing member 312 to extend into the first moving iron core 313, it is convenient to use the space of the installation cavity 311 to install the second elastic member 42, and a small gap can be maintained between the second moving iron core 412 and the first moving iron core 313. The movement guidance of the second moving iron core 412 is better, and the movement stagnation of the second moving iron core 412 is reduced.

[0060] In another embodiment, one end of the second elastic member 42 is connected to the end of the second moving iron core 412 away from the valve seat 2, and the other end of the second elastic member 42 extends along the axial direction of the second moving iron core 412 to connect to the fixed iron core 12. Figure 6 As shown, in this way, the influence of the action of the first sealing assembly 3 on the second elastic member 42 can be reduced. When the solenoid valve is closed, the first elastic member 32 and the second elastic member 42 can act simultaneously and independently of each other.

[0061] In order to avoid affecting the magnetic connection between the fixed iron core 12 and the second moving iron core 412 during the valve opening action, an avoidance groove 4122 is opened at the end of the second moving iron core 412, and the avoidance groove 4122 is recessed in the third concave-convex portion 4121. The second elastic member 42 is accommodated in the avoidance groove 4122, so that there is sufficient axial length to accommodate the second elastic member 42. The length of the second elastic member 42 can meet the elastic reset force requirement for closing the valve.

[0062] In other embodiments, when the inner cavity 21 and the installation cavity 311 are limited in space, the first elastic member 32 and the second elastic member 42 may also be elastic structures such as spring leaves.

[0063] The first moving iron core 313 includes a connecting portion 3132 and a core shaft portion 3133. Both the connecting portion 3132 and the core shaft portion 3133 are thin-walled structures to form a mounting cavity 311. The first sealing member 312 is connected to the connecting portion 3132. The inner cavity diameter of the connecting portion 3132 is larger than the inner cavity diameter of the core shaft portion 3133. The cavity of the connecting portion 3132 is used to accommodate the second sealing member 411. In order to improve the structural strength of the first moving iron core 313, the connecting portion 3132 and the core shaft portion 3133 are integrally formed, such as Figure 7As shown; the first moving iron core 313 is a metal part, which can be formed by sheet metal processing techniques such as forging or turning, thereby reducing the number of parts, ensuring the dimensional accuracy of parts, reducing the precision error caused by assembly, and facilitating the control of dimensional stability.

[0064] In another embodiment, the connecting portion 3132 is a sheet metal structure, and the connecting portion 3132 and the core shaft portion 3133 are fixedly connected by welding. Figure 8 shown.

[0065] In one embodiment, the valve seat 2 is provided with a first sealing convex ring 24 and a second sealing convex ring 25 protruding from the plane where the gas outlet 23 is located, the second sealing convex ring 25 surrounds the gas outlet 23, the first sealing convex ring 24 surrounds the second sealing convex ring 25, the first valve core 31 seals against the first sealing convex ring 24, and the second valve core 41 seals against the second sealing convex ring 25. The first sealing convex ring 24 and the second sealing convex ring 25 are provided in a protruding manner, so as to reduce the contact area between the first sealing member 312, the second sealing member 411 and the valve seat 2, and avoid leakage gaps caused by uneven contact surfaces. Moreover, the first sealing convex ring 24 and the second sealing convex ring 25 are provided separately, so as to reduce the mutual influence between the first sealing member 312 and the second sealing member 411.

[0066] The first sealing member 312 and the second sealing member 411 are both made of rubber. The first sealing member 312 and the first sealing convex ring 24 form a first sealing pair, and the second sealing member 411 and the second sealing convex ring 25 form a second sealing pair to improve the sealing performance of the solenoid valve.

[0067] The utility model embodiment also provides a gas device, the gas device includes the solenoid valve as described above, the gas device also includes a gas pipeline, the solenoid valve is connected to the gas pipeline, and is used to control the on and off of the gas pipeline. The solenoid valve has a first sealing component 3 and a second sealing component 4, the first valve core 31 of the first sealing component 3 is provided with an installation cavity 311, and the second valve core 41 of the second sealing component 4 can be axially movably arranged in the installation cavity 311, and the magnetic force of the solenoid component 1 can simultaneously drive the first valve core 31 and the second valve core 41 to move axially to form the open valve state of the solenoid valve; after the solenoid component 1 is powered off, the closing action of the first valve core 31 and the second valve core 41 is controlled by the respective first elastic member 32 and the second elastic member 42, which are independent of each other, reducing the risk of gas leakage of the gas device when the solenoid valve is in a fault state, and improving the safety of the gas device. Moreover, in the normal closed state, the internal and external double sealing form formed by the first valve core 31 and the second valve core 41 greatly improves the safety performance of the gas device.

[0068] Gas appliances include gas stoves, gas water heaters and other appliances that use gas to provide combustion energy, and this embodiment does not impose any specific limitation.

[0069] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. Solenoid valve, characterized in that, The solenoid valve comprises: An electromagnetic assembly (1) having a receiving groove; A valve seat (2) is mounted on the electromagnetic assembly (1), the valve seat (2) and the electromagnetic assembly (1) enclose an inner cavity (21), and the valve seat (2) is provided with an air inlet (22) and an air outlet (23) communicating with the inner cavity (21); A first sealing assembly (3), comprising a first valve core (31) and a first elastic member (32), wherein the first valve core (31) can be axially movably installed in the receiving groove, and one end of the first valve core (31) extends into the inner cavity (21); the first elastic member (32) is connected to the first valve core (31), and the first elastic member (32) is used to push the first valve core (31) to seal against the valve seat (2) to block the air outlet (23); the first valve core (31) is provided with an installation cavity (311), and the installation cavity (311) runs through both ends of the first valve core (31); A second sealing assembly (4), comprising a second valve core (41) and a second elastic member (42); the second valve core (41) can be axially movably installed in the installation cavity (311), and one end of the second valve core (41) extends into the inner cavity (21); the first valve core (31) is arranged around the periphery of the second valve core (41); the second elastic member (42) is connected to the second valve core (41), and the second elastic member (42) is used to push the second valve core (41) to seal against the valve seat (2) to block the air outlet (23); When energized, the electromagnetic assembly (1) is used to drive the first valve core (31) and the second valve core (41) to move in an axial direction, so that the first valve core (31) and the second valve core (41) open the air outlet (23).

2. The solenoid valve according to claim 1, characterized in that: The first valve core (31) comprises a first sealing member (312) and a first moving iron core (313) which are connected to each other, the first moving iron core (313) is inserted into the receiving groove, and the installation cavity (311) is arranged on the first moving iron core (313); The second valve core (41) comprises a second sealing member (411) and a second moving iron core (412) which are connected to each other, and the second moving iron core (412) is inserted into the installation cavity (311); the first sealing member (312) is arranged around the periphery of the second sealing member (411), and the first sealing member (312) and the second sealing member (411) are used for sealing against the valve seat (2).

3. The solenoid valve according to claim 2, characterized in that: The installation cavity (311) passes through the first moving iron core (313), and the second moving iron core (412) passes through the installation cavity (311).

4. The solenoid valve according to claim 2, characterized in that: A gap is provided between the first sealing member (312) and the second sealing member (411), and a flexible sealing structure for sealing the gap is provided between the second valve core (41) and the first valve core (31).

5. The solenoid valve according to claim 4, characterized in that: The flexible sealing structure is a flexible diaphragm (6), the outer side of the flexible diaphragm (6) is connected to the first sealing member (312), and the inner side of the flexible diaphragm (6) is connected to the second sealing member (411); the width of the flexible diaphragm (6) is greater than the width of the gap.

6. The solenoid valve according to claim 5, characterized in that: The flexible diaphragm (6), the first sealing component (312), and the second sealing component (411) are integrally formed.

7. The solenoid valve according to claim 2, characterized in that: The first valve core (31) comprises an integrally formed connecting portion (3132) and a core shaft portion (3133), the core shaft portion (3133) is inserted into the receiving groove, and the first sealing member (312) is connected to the connecting portion (3132).

8. The solenoid valve according to claim 1, characterized in that: One end of the second elastic member (42) is connected to the second valve core (41), and the other end is connected to the first valve core (31); or, One end of the second elastic member (42) is connected to the second valve core (41), and the other end is connected to the electromagnetic assembly (1).

9. The solenoid valve according to any one of claims 1 to 8, characterized in that: The valve seat (2) is provided with a first sealing convex ring (24) and a second sealing convex ring (25) on the plane where the air outlet (23) is located, the second sealing convex ring (25) surrounds the air outlet (23), the first sealing convex ring (24) is arranged on the periphery of the second sealing convex ring (25), the first valve core (31) is used for sealingly abutting the first sealing convex ring (24), and the second valve core (41) is used for sealingly abutting the second sealing convex ring (25).

10. Gas equipment, characterized in that Comprising a solenoid valve as described in any one of claims 1-9.

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