Solenoid valve and gas device

Abstract

The utility model belongs to solenoid valve technical field, specifically discloses a solenoid valve and gas device, and the gas device includes solenoid valve, and solenoid valve includes valve body, sets up the sealing cap in the inner chamber of valve body, valve core and valve shaft subassembly, is set up main medium export and medium import in the inner chamber of valve body that communicates the inner chamber of valve body on valve body, valve core is detachably connected with sealing cap and forms the medium chamber of surrounding, and the inner chamber of valve body is communicated to medium chamber, and the vice medium export that communicates medium chamber is set up on sealing cap, valve shaft subassembly includes valve rod and stop piece, and valve rod is integrally formed, and the first end of valve rod is inserted into medium chamber, and stop piece is detachably connected in valve rod to limit the first end of valve rod in medium chamber, and valve rod can move along the axial movement to close or open vice medium export, and valve rod still can drive sealing cap axial movement through valve core to make sealing cap open and close main medium export. The solenoid valve valve rod of above-mentioned is good to the closure of vice medium export, and the reliability is high, and the maintenance is convenient.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, and in particular to an electromagnetic valve and a gas device. Background Technology

[0002] On / off type solenoid valves can operate rapidly under rated voltage, using electromagnetic force to drive the valve stem and thus open or close the valve. Currently, solenoid valves used in the gas industry quickly open the gas passage after being energized, reaching maximum flow immediately upon opening. However, these valves are highly susceptible to deflagration during ignition. Therefore, patent document CN222596772U proposes a solenoid valve that can open in stages: a small opening during ignition, and a large opening (fully open) after successful ignition.

[0003] like Figure 10 As shown, the solenoid valve includes a valve body 1' and a valve core 3', a sealing cap 2', and a valve shaft assembly 4', all located within the inner cavity of the valve body 1. The valve shaft assembly 4' includes a valve stem 41' and a moving shaft 42'. To confine the valve stem 41' within the medium cavity formed by the valve core 3' and the sealing cap 2', the valve stem 41' is a stepped rod. For ease of assembly, the valve stem 41' and the moving shaft 42' are separate components. The valve stem 41' passes through the valve core 3' and is then riveted to connect to the moving shaft 42'. This makes it difficult to ensure the coaxiality between the valve stem 41' and the moving shaft 42', which in turn affects the sealing effect of the valve stem 41' on the secondary medium outlet, making the entire gas device prone to gas leakage. Furthermore, it is inconvenient to disassemble and maintain it later. Utility Model Content

[0004] One of the technical problems solved by this utility model is to provide a solenoid valve that can effectively solve the problem that the sealing effect of the solenoid valve is affected or the valve shaft assembly is inconvenient to disassemble due to the separate valve stem.

[0005] The second technical problem solved by this utility model is to provide a gas device that can effectively solve the problems of easy gas leakage or inconvenient maintenance.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A solenoid valve includes a valve body, a sealing cap and a valve core disposed in the inner cavity of the valve body, and a valve shaft assembly. The valve body has a main medium outlet and a medium inlet communicating with the inner cavity of the valve body and the outside. The valve core is detachably connected to the sealing cap and together with the sealing cap to form a medium chamber, the medium chamber communicating with the inner cavity of the valve body. The sealing cap has a secondary medium outlet communicating with the medium chamber, and the valve core has a central hole communicating with the medium chamber. The valve shaft assembly includes a valve stem and a limiting member. The valve stem is integrally formed, and the first end of the valve stem passes through the central hole on the valve core into the medium chamber. The limiting member engages with the valve stem to limit the first end of the valve stem within the medium chamber. The first end of the valve stem can move axially within the medium chamber to close or open the secondary medium outlet. The valve stem can also drive the sealing cap to move axially via the valve core to open or close the main medium outlet.

[0008] Compared with the prior art, the electromagnetic valve described in this utility model has the following advantages: The electromagnetic valve uses a limiting member to confine the first end of the valve stem within the medium chamber. During installation, the valve stem can be passed through the central hole, and then the limiting member can be assembled onto the valve stem to achieve the connection between the valve core and the valve stem. Then, a sealing cap is installed on the valve core, thereby completing the installation of the sealing cap, valve core, and valve stem. The entire valve stem does not need to be set up separately, which helps to improve the coaxiality of the valve stem and improves the reliability of the valve stem in sealing the secondary medium outlet. Moreover, when maintenance is required, the sealing cap can be removed first, the limiting member can be removed from the valve stem, and then the valve core and valve stem can be separated, which is convenient and quick.

[0009] In one embodiment, the central hole is a stepped hole, the diameter of the end of the central hole facing the secondary medium outlet is not less than the outer diameter of the limiting member, and the diameter of the end of the central hole facing away from the secondary medium outlet is less than the outer diameter of the limiting member.

[0010] In one embodiment, the valve core includes a snap-fit ​​protrusion, a connecting portion, and a limiting portion. The snap-fit ​​protrusion and the limiting portion are respectively disposed on opposite sides of the connecting portion. The sealing cap is provided with a second slot. The snap-fit ​​protrusion is elastically engaged in the second slot, and the limiting portion abuts against the end face of the sealing cap.

[0011] In one embodiment, the valve core is integrally injection molded, the snap-fit ​​protrusion is provided with a first notch spaced apart along the circumferential direction, the limiting part is provided with a second notch spaced apart along the circumferential direction, the number of the first notch and the number of the second notch are the same, the orthographic projection of the first notch along the axial direction of the connecting part is offset from the second notch; the orthographic projection of the snap-fit ​​protrusion along the axial direction of the connecting part coincides with the second notch.

[0012] In one embodiment, the solenoid valve further includes a first elastic element sleeved on the valve stem, the first elastic element having a tendency to keep the valve stem closed or open the secondary medium outlet.

[0013] In one embodiment, the solenoid valve includes a coil assembly for driving the valve stem to move axially. The valve body has an opening on the side away from the main medium outlet. The coil assembly is disposed on the opening side of the valve body and cooperates with the valve body to form a closed inner cavity. A limiting step is provided on the outer wall of the valve stem. One end of the first elastic member abuts against the coil assembly, and the other end of the first elastic member abuts against the limiting step.

[0014] In one embodiment, the limiting member is a retaining ring, which is engaged with the first end of the valve stem.

[0015] In one embodiment, there is a gap between the wall of the central hole and the valve stem, and the medium chamber communicates with the inner cavity of the valve body through the gap.

[0016] In one embodiment, the solenoid valve includes a coil assembly, the valve stem includes a large-diameter section and a small-diameter section coaxially connected, the large-diameter section is movably inserted through the coil assembly, the small-diameter section is inserted through the medium chamber, and the limiting member is disposed on the small-diameter section.

[0017] The second technical problem mentioned above is solved by the following technical solution:

[0018] A gas appliance, including any of the solenoid valves described above.

[0019] Compared with the prior art, the control method of the gas wall-hung boiler described in this utility model has the following advantages: the valve stem of the solenoid valve in the above-mentioned gas device is simple to process, has high assembly precision, has high reliability when the solenoid valve disconnects the gas, is not easy to leak gas, and has low difficulty in maintenance and replacement of the solenoid valve. Attached Figure Description

[0020] Figure 1 A cross-sectional view of the solenoid valve provided in an embodiment of this utility model;

[0021] Figure 2 for Figure 1 Enlarged view of point C in the middle;

[0022] Figure 3 A three-dimensional structural diagram of the solenoid valve provided in an embodiment of this utility model (with the valve body hidden);

[0023] Figure 4 for Figure 3 Elevation section;

[0024] Figure 5 for Figure 4 Enlarged view of point D in the middle;

[0025] Figure 6 An exploded view of the solenoid valve provided in an embodiment of this utility model;

[0026] Figure 7 This is a schematic diagram of the valve shaft assembly provided in an embodiment of the present utility model;

[0027] Figure 8 A schematic diagram of the valve core provided in this embodiment of the utility model;

[0028] Figure 9 A cross-sectional view of the sealing cap provided in an embodiment of this utility model;

[0029] Figure 10 This is a cross-sectional view of a solenoid valve in related technologies.

[0030] Label Explanation:

[0031] 1. Valve body; 11. Main medium outlet; 12. Medium inlet; 13. Second protrusion; 2. Sealing cap; 21. Secondary medium outlet; 22. Opening groove; 23. Second retaining groove; 24. First protrusion; 25. Groove; 3. Valve core; 31. Snap-fit ​​protrusion; 311. First notch; 32. Connecting part; 33. Limiting part; 331. Second notch; 34. Center hole; 35. Second guide boss; 4. Valve shaft assembly Components; 41. Valve stem; 411. Large diameter section; 412. Small diameter section; 413. Limiting step; 414. First slot; 42. Limiting component; 5. Coil assembly; 51. Conductive coil; 52. Outer magnetic plate; 521. First guide boss; 53. Inner magnetic plate; 54. Magnetic guide frame; 55. Fixed shaft; 56. Copper sleeve; 6. Sealing ring; 7. First elastic element; 8. Second elastic element; 100. Medium chamber. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] This invention provides an embodiment of a solenoid valve, which can be applied to, but is not limited to, gas appliances, to achieve segmented opening and closing control of fluids. Figures 1-9As shown, the solenoid valve includes a valve body 1 and a valve core 3, a sealing cap 2, and a valve shaft assembly 4, all disposed within the inner cavity of the valve body 1. The valve body 1 has a main medium outlet 11 and a medium inlet 12 connecting the inner cavity of the valve body 1 to the outside. Fluid enters the inner cavity of the valve body 1 through the medium inlet 12 and flows out of the inner cavity of the valve body 1 through the main medium outlet 11. The sealing cap 2 and the valve core 3 are detachably and fixedly connected, forming a medium chamber 100. The medium chamber 100 connects to the inner cavity of the valve body 1. The sealing cap 2 has a secondary medium outlet 21 connecting to the medium chamber 100. The medium can enter the medium chamber 100 and then flow out of the medium chamber 100 through the secondary medium outlet 21. The valve core 3 has a central hole 34 connecting to the medium chamber 100. The valve stem assembly 4 includes a valve stem 41 and a limiting member 42. The valve stem 41 is integrally formed, and its first end passes through the central hole 34 into the medium chamber 100. The first end of the valve stem 41 can move axially within the medium chamber 100 to close or open the secondary medium outlet 21. Specifically, the secondary medium outlet 21 is coaxial with the central hole 34. The limiting member 42 is detachably connected to the valve stem 41 to limit the first end of the valve stem 41 within the medium chamber 100. The valve stem 41 can also drive the sealing cap 2 to move axially through the valve core 3 to close or open the main medium outlet 11.

[0037] For example, a first groove 414 is provided on the outer side wall of the first end of the valve stem 41, and the limiting member 42 is a retaining spring. The retaining spring is engaged in the first groove 414 and can abut against the valve core 3 to limit the valve stem 41 to the medium chamber 100.

[0038] The aforementioned solenoid valve utilizes a limiting member 42 to confine the first end of the valve stem 41 within the medium chamber 100. Compared to a separate valve stem 41 and a stepped valve stem, the valve stem 41 can be inserted into the medium chamber 100 from the end facing away from the secondary medium outlet 21 through the central hole 34, and then the limiting member 42 can be assembled onto the valve stem 41. The entire valve stem 41 is integrally formed, eliminating the need for separate components. This reduces the machining difficulty of the valve stem 41, improves its machining accuracy, reduces the deviation between the first end of the valve stem 41 and the preset installation position when assembled into the medium chamber 100, and improves the reliability of the valve stem 41 in sealing the secondary medium outlet 21, thereby improving the reliability of the solenoid valve. Furthermore, when the valve stem 41 in the aforementioned solenoid valve needs to be replaced, it is only necessary to first disassemble the sealing cap 2 and the valve core 3, and then remove the limiting member 42 from the valve stem 41, making disassembly and assembly convenient.

[0039] It should be noted that the valve stem 41 is an iron core. To achieve axial movement of the valve stem 41, refer to... Figure 3 and Figure 4 As shown, the solenoid valve also includes a coil assembly 5. The valve body 1 has an opening on the side away from the main medium outlet 11, and the coil assembly 5 is disposed on the opening side of the valve body 1 and cooperates with the valve body 1 to form a closed inner cavity.

[0040] refer to Figure 6 As shown, the coil assembly 5 includes a conductive coil 51, an outer magnetic plate 52, an inner magnetic plate 53, a magnetic guide frame 54, and a fixed shaft 55. The conductive coil 51 has a through hole along its axial direction. The fixed shaft 55 is fixed in the through hole. The second end of the valve stem 41 is movably inserted into the through hole. A copper sleeve 56 is provided between the valve stem 41 and the conductive coil 51. The inner magnetic plate 53 and the outer magnetic plate 52 are sequentially sleeved on the valve stem 41 along its axial direction and connected to the U-shaped magnetic guide frame 54. Sealing rings 6 are provided between the outer magnetic plate 52 and the valve body 1, between the valve stem 41 and the copper sleeve 56, and between the copper sleeve 56 and the outer magnetic plate 52 to prevent the medium from entering the coil assembly 5. When the conductive coil 51 is energized, the valve stem 41 moves axially. This is prior art in this field and will not be described in detail here.

[0041] refer to Figure 9 As shown, the sealing cap 2 has an opening groove 22 at one axial end, and a groove 25 is formed on the bottom wall of the opening groove 22. One end of the valve core 3 is fixed in the opening groove 22. The inner wall of the groove 25 and the valve core 3 form a medium chamber 100. The secondary medium outlet 21 is opened on the bottom wall of the groove 25. In order to avoid the sealing cap 2 increasing in height along the valve stem 41 due to the setting of the limiting member 42, the central hole 34 is set as a stepped hole. The diameter of the hole on the side facing the secondary medium outlet 21 is larger than the diameter on the side facing away from the secondary medium outlet 21. The limiting member 42 is at least partially located in the central hole 34.

[0042] For example, the sealing cap 2 is a rubber part. When the valve shaft assembly 4 is used to open and close the secondary medium outlet 21 provided on the sealing cap 2, and the sealing cap 2 is used to open and close the main medium outlet 11 provided on the valve body 1, the sealing cap 2 has a certain deformation performance. After being squeezed by the valve body 1 or the valve stem 41, it deforms and the sealing effect is better.

[0043] refer to Figure 2 As shown, a first protrusion 24 is provided on the bottom wall of the groove 25 around the secondary medium outlet 21. The first end face of the valve stem 41 can abut against the first protrusion 24 to disconnect the medium chamber 100 and the secondary medium outlet 21. The provision of the first protrusion 24 can reduce the possibility that the valve stem 41 will not have a good sealing effect on the secondary medium outlet 21 due to the low machining accuracy of the bottom wall of the groove 25.

[0044] Similarly, a second protrusion 13 is provided on the inner wall of the valve body 1, protruding around the main medium outlet 11. The end face of the sealing cap 2 can abut against the second protrusion 13 to seal the main medium outlet 11. The provision of the second protrusion 13 can reduce the possibility that the sealing cap 2 will not have a good sealing effect on the main medium outlet 11 due to the low machining precision of the inner wall of the valve body 1.

[0045] In some embodiments, the valve core 3 and the sealing cap 2 are snapped together and fixed. Specifically, the valve core 3 includes a snap-fit ​​protrusion 31, and the sealing cap 2 is provided with a second snap-fit ​​groove 23, in which the snap-fit ​​protrusion 31 is elastically snapped into the second snap-fit ​​groove 23. Specifically, the second snap-fit ​​groove 23 is formed on the side wall of the opening groove 22.

[0046] Continue to refer to Figure 2 As shown, to reduce the difficulty of inserting the snap-fit ​​protrusion 31 into the opening groove 22 and then snapping it into the snap-fit ​​protrusion 31, the outer peripheral surface of the snap-fit ​​protrusion 31 is set as a tapered surface that gradually expands from one end near the secondary medium outlet 21 to the other end. When the snap-fit ​​protrusion 31 is snapped into the second snap-fit ​​groove 23, the tapered surface compresses and deforms the sealing cap 2, thereby snapping the snap-fit ​​protrusion 31 into the second snap-fit ​​groove 23. Obviously, the tapered surface has a guiding function, which helps the snap-fit ​​protrusion 31 to smoothly snap into the second snap-fit ​​groove 23.

[0047] In addition, refer to Figure 8 As shown, the valve core 3 also includes a connecting part 32 and a limiting part 33. The snap-fit ​​protrusion 31 and the limiting part 33 are respectively disposed at both ends of the axial direction of the connecting part 32, and the limiting part 33 is located outside the opening groove 22 and abuts against the end face of the sealing cap 2. The valve core 3 is approximately "I" shaped. The sealing cap 2 is partially embedded in the limiting groove formed between the limiting part 33 and the snap-fit ​​protrusion 31, which improves the connection stability between the valve core 3 and the sealing cap 2.

[0048] In some embodiments, the valve core 3 is integrally injection molded. To reduce the processing difficulty of the valve core 3, the snap-fit ​​protrusion 31 is provided with first notches 311 spaced apart along the circumferential direction, and the limiting part 33 is provided with second notches 331 spaced apart along the circumferential direction. The number of first notches 311 and the number of second notches 331 are the same. The orthographic projection of the first notches 311 along the axial direction of the connecting part 32 is offset from the second notches 331. The orthographic projection of the snap-fit ​​protrusion 31 along the axial direction of the connecting part 32 coincides with the second notches 331. Therefore, during the injection molding of the valve core 3, the snap-fit ​​protrusion 31 on the valve core 3 can be formed using only the upper and lower molds, without being blocked by the limiting part 33. Thus, there is no need to set a core-pulling mechanism, making the molding simpler. Moreover, since the valve core 3 is processed using only the upper and lower molds, the contact surface between the valve core 3 and the sealing cap 2 has a high flatness and good sealing performance. For example, there are three of each of the first notches 311 and the second notches 331.

[0049] In some embodiments, there is a gap between the wall of the central hole 34 on the valve core 3 and the valve stem 41, and the medium chamber 100 communicates with the inner cavity of the valve body 1 through the gap. Compared with opening a medium through hole on the valve core 3 to connect the medium chamber 100 and the inner cavity of the valve body 1, the processing difficulty of the valve core 3 is further reduced.

[0050] In some embodiments, the solenoid valve further includes a first elastic element 7, which applies a force to the valve stem 41 to maintain the valve stem 41 in a tendency to close or open the secondary medium outlet 21. (If the coil assembly 5 is energized, the valve stem 41 closes the secondary medium outlet 21, i.e., the solenoid valve is normally open; in this case, the first elastic element 7 maintains the tendency of the valve stem 41 to open the secondary medium outlet 21. If the coil assembly 5 is energized, the valve stem 41 opens the secondary medium outlet 21, i.e., the solenoid valve is normally closed; in this case, the first elastic element 7 maintains the tendency of the valve stem 41 to close the secondary medium outlet 21.) Taking the solenoid valve as a normally closed valve as an example, the first elastic element 7 can be a compression spring. Specifically, one end of the first elastic element 7 abuts against the outer magnetic plate 52 in the coil assembly 5, and the other end abuts against the limiting step 413 formed on the valve stem 41 to facilitate the application of force to the valve stem 41.

[0051] refer to Figure 7 As shown, the valve stem 41 includes a large-diameter section 411 and a small-diameter section 412 coaxially connected. The large-diameter section 411 is movably inserted through the through hole. The large-diameter section 411 has a large outer diameter, high rigidity, and is not easily bent or deformed. The small-diameter section 412 is inserted into the medium chamber 100, and the limiting member 42 is disposed on the small-diameter section 412. Since the effective flow area of ​​the secondary medium outlet 21 is relatively small, the small-diameter section 412 with a relatively small outer diameter is sufficient to achieve the purpose of sealing the secondary medium outlet 21, thus reducing the manufacturing cost of the valve stem 41. Specifically, the limiting step 413 is formed on the outer wall of the small-diameter section 412. In order to limit the first elastic member 7 and reduce the possibility of the first elastic member 7 deflection, the outer magnetic plate 52 facing the valve core 3 is provided with a first guide boss 521 whose outer diameter gradually increases from one end closer to the valve core 3 to the other end. The first elastic member 7 is a conical spring, and its end away from the valve core 3 is sleeved on the first guide boss 521.

[0052] In some embodiments, the solenoid valve further includes a second elastic element 8, which applies a force to the sealing cap 2 to maintain the sealing cap 2 in a tendency to close or open the main medium outlet 11. Given that the solenoid valve is a normally closed valve, the second elastic element 8 can also be a compression spring, with one end abutting against the coil assembly 5 and the other end abutting against the valve core 3, so that a force is applied to the sealing cap 2 through the valve core 3.

[0053] refer to Figure 8 As shown, in order to limit the second elastic member 8 and reduce the possibility of the second elastic member 8 deflection, the limiting part 33 of the valve core 3 is provided with a second guide boss 35 on the side opposite to the snap-fit ​​protrusion 31, and the second elastic member 8 is sleeved on the second guide boss 35.

[0054] The first elastic element 7 and the second elastic element 8 are both sleeved on the valve stem 41, and the inner diameter of the second elastic element 8 is larger than the maximum outer diameter of the first elastic element 7. When assembling the solenoid valve, first insert the second end of the valve stem 41 into the conductive coil 51, then sleeve the first elastic element 7 and the second elastic element 8 on the valve stem 41 in sequence, then sleeve the valve core 3 on the valve stem 41, and set the limiting element 42 on the valve stem 41 to realize the limiting between the valve stem 41 and the valve core 3.

[0055] An embodiment of this utility model also proposes a gas device, including the aforementioned solenoid valve, wherein the medium flowing through the solenoid valve is gas, and the solenoid valve is used to control the gas supply. This gas device can be a gas water heater, gas stove, or other gas-using device.

[0056] When the solenoid valve is used in a gas appliance, it is a normally closed solenoid valve, and the effective flow area of ​​the secondary medium outlet 21 is smaller than that of the main medium outlet 11. When the first rated voltage is input into the conductive coil 51, the conductive coil 51 generates an electromagnetic force to drive the valve stem 41 to move away from the secondary medium outlet 21 against the force of the first elastic element 7. The secondary medium outlet 21 is opened, and the gas enters the inner cavity of the valve body 1 through the medium inlet 12, then flows into the medium chamber 100 and flows out of the solenoid valve through the secondary medium outlet 21. Since the effective flow area of ​​the secondary medium outlet 21 is smaller than that of the main medium outlet 11, the amount of gas flowing out of the solenoid valve is smaller, reducing the possibility of deflagration. After the secondary medium outlet 21 is opened, the coil is input with a second rated voltage, which is greater than the first rated voltage. At this time, the electromagnetic force generated by the conductive coil 51 can drive the valve stem 41 to overcome the force of the second elastic element 8, and drive the valve core 3 and the sealing cap 2 to move away from the main medium outlet 11. The main medium outlet 11 is opened, and the gas in the inner cavity of the valve body 1 flows out through the main medium outlet 11.

[0057] By adjusting the rated input voltage, the opening and closing of the main medium outlet 11 and the auxiliary medium outlet 21 can be switched. It should be noted that when only the auxiliary medium outlet 21 is open, the gas device can also achieve low-temperature combustion function. That is, by controlling the opening and closing of the main medium outlet 11 and the auxiliary medium outlet 21, the gas device can not only reduce the occurrence of deflagration during the ignition of the whole machine, but also switch between large and small flames.

[0058] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0059] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A solenoid valve, characterized in that, include: The valve body (1) has a main medium outlet (11) and a medium inlet (12) that connect the inner cavity of the valve body (1) to the outside. A sealing cap (2) is disposed in the inner cavity of the valve body (1); A valve core (3) is disposed in the inner cavity of the valve body (1). The valve core (3) is detachably connected to the sealing cap (2) and together with the sealing cap (2) forms a medium chamber (100). The medium chamber (100) communicates with the inner cavity of the valve body (1). The sealing cap (2) is provided with a secondary medium outlet (21) communicating with the medium chamber (100). The valve core (3) is provided with a central hole (34) communicating with the medium chamber (100). The valve stem assembly (4) includes a valve stem (41) and a limiting member (42). The valve stem (41) is integrally formed. The first end of the valve stem (41) passes through the central hole (34) into the medium chamber (100). The limiting member (42) is detachably fixed to the valve stem (41) to limit the first end of the valve stem (41) within the medium chamber (100). The first end of the valve stem (41) can move axially within the medium chamber to close or open the secondary medium outlet (21). The valve stem (41) can also drive the sealing cap (2) to move axially through the valve core (3) to close or open the main medium outlet (11).

2. The solenoid valve according to claim 1, characterized in that, The central hole (34) is a stepped hole. The diameter of the end of the central hole (34) facing the secondary medium outlet (21) is not less than the outer diameter of the limiting member (42), and the diameter of the end of the central hole (34) facing away from the secondary medium outlet (21) is less than the outer diameter of the limiting member (42).

3. The solenoid valve according to claim 1 or 2, characterized in that, The valve core (3) includes a snap-fit ​​protrusion (31), a connecting part (32) and a limiting part (33). The snap-fit ​​protrusion (31) and the limiting part (33) are respectively disposed at both ends of the connecting part (32). The sealing cap (2) is provided with a second slot (23). The snap-fit ​​protrusion (31) is elastically snapped into the second slot (23). The limiting part (33) abuts against the end face of the sealing cap (2).

4. The solenoid valve according to claim 3, characterized in that, The valve core (3) is integrally injection molded. The snap-fit ​​protrusion (31) is provided with a first notch (311) spaced apart along the circumferential direction. The limiting part (33) is provided with a second notch (331) spaced apart along the circumferential direction. The number of the first notches (311) is the same as the number of the second notches (331). The orthographic projection of the first notch (311) along the axial direction of the connecting part (32) is offset from the second notch (331). The orthographic projection of the snap-fit ​​protrusion (31) along the axial direction of the connecting part (32) coincides with the second notch (331).

5. The solenoid valve according to claim 1 or 2, characterized in that, The solenoid valve also includes a first elastic element (7), which is sleeved on the valve stem (41). The first elastic element (7) is used to make the valve stem (41) tend to keep the secondary medium outlet (21) closed or open.

6. The solenoid valve according to claim 5, characterized in that, The solenoid valve includes a coil assembly (5) for driving the valve stem (41) to move axially. The valve body (1) has an opening on the side away from the main medium outlet (11). The coil assembly (5) is disposed on the opening side of the valve body (1) and cooperates with the valve body (1) to form a closed inner cavity. A limiting step (413) is provided on the outer wall of the valve stem (41). One end of the first elastic member (7) abuts against the coil assembly (5), and the other end of the first elastic member (7) abuts against the limiting step (413).

7. The solenoid valve according to claim 1 or 2, characterized in that, The limiting member (42) is a retaining ring, which is engaged at the first end of the valve stem (41).

8. The solenoid valve according to claim 1 or 2, characterized in that, There is a gap between the wall of the central hole (34) and the valve stem (41), and the medium chamber (100) is connected to the inner cavity of the valve body (1) through the gap.

9. The solenoid valve according to claim 1 or 2, characterized in that, The solenoid valve includes a coil assembly (5), and the valve stem (41) includes a large-diameter section (411) and a small-diameter section (412) coaxially connected. The large-diameter section (411) is movably inserted through the coil assembly (5), and the small-diameter section (412) is inserted through the medium chamber (100). The limiting member (42) is disposed on the small-diameter section (412).

10. A gas-fired device, characterized in that, Includes the solenoid valve as described in any one of claims 1-9.

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