An electromagnetic valve, a gas distribution device and a gas water heater

Abstract

This utility model belongs to the field of heating technology, specifically disclosing an electromagnetic valve, a gas distribution device, and a gas-fired hot water equipment. The electromagnetic valve includes an electromagnetic mechanism, a first valve core, and a second valve core. The electromagnetic mechanism has a central hole and a fixed base. The first valve core is slidably inserted into the central hole and has a central through-hole extending axially. The second valve core passes through the central through-hole and is spaced apart from the hole wall. The first end of the second valve core is slidably inserted into the fixed base. A first elastic element applies an elastic force to the first valve core, causing it to move along a first axial direction, which is opposite to the direction of the electromagnetic force acting on the first valve core when the electromagnetic mechanism is energized. A second elastic element applies an elastic force to the second valve core, causing it to move along the first axial direction. This utility model can avoid interference between the movement of the first and second valve cores, improve the reliability of movement control of the first and second valve cores, and enhance the reliability of the gas distribution device and the gas-fired hot water equipment.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to an electromagnetic valve, a gas distribution device, and a gas-fired hot water equipment. Background Technology

[0002] Gas-fired water heaters generate heat through the combustion of gas in their internal combustion device, thereby providing heat supply. The combustion device includes multiple burners arranged side by side and a gas distribution device that supplies gas to the burners.

[0003] The prior art provides a gas distribution device, which includes a gas distribution seat and a solenoid valve. The gas distribution rod has a first gas distribution chamber, a second gas distribution chamber, a third gas distribution chamber, and a valve mounting chamber. The gas distribution rod also has an air inlet channel communicating with the first gas distribution chamber and the valve mounting chamber. The bottom of the valve mounting chamber has a first valve port communicating with the second gas distribution chamber and a second valve port communicating with the third gas distribution chamber. The solenoid valve has a first valve core, which has an inner valve chamber and a ventilation channel communicating with the first valve port. The side wall of the inner valve chamber has a ventilation port communicating with the air inlet channel. A second valve core is movably disposed in the inner valve chamber to selectively open or close the air inlet port of the ventilation channel. The first valve core is slidably disposed in the valve mounting chamber to selectively open or close the second valve port. Thus, a single electromagnetic mechanism can drive the first valve core to operate independently to open the first valve port, or drive the first and second valve cores to operate simultaneously to open the first and second valve ports simultaneously, thereby achieving segmented gas supply to the second and third gas distribution chambers.

[0004] While existing gas distribution devices can control the distribution of gas between two chambers using a single solenoid valve, the location of the second valve core inside the first valve core makes the overall assembly of the solenoid valve difficult and hinders its disassembly and assembly. Furthermore, the sliding fit between the second and first valve cores causes friction during operation, potentially leading to the first valve core moving axially and opening the second valve port. This is especially problematic when the friction between the first and second valve cores is high due to machining errors, assembly errors, or wear, making it easier for them to become linked. This weakens the solenoid valve's control accuracy over the opening and closing of the first and second valve ports, and may even affect the normal and reliable operation of the gas distribution device. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a solenoid valve that can effectively solve the problem of linkage between the first valve core and the second valve core caused by friction between the first valve core and the second valve core in existing solenoid valves, thereby improving the reliability of the solenoid valve in controlling the movement of the first valve core and the second valve core.

[0006] The second technical problem solved by this utility model is to provide a gas distribution device that can effectively solve the problem of unreliable gas distribution caused by the low control accuracy of the solenoid valve on the first and second valve cores in existing gas distribution devices, thereby improving the gas distribution reliability of the gas distribution device.

[0007] The third technical problem solved by this utility model is to provide a gas-fired water heater that can effectively solve the problem that the unreliable gas distribution in existing gas-fired water heaters leads to unreliable segmented combustion control, which in turn reduces the reliability of the gas-fired water heater.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A solenoid valve, the solenoid valve comprising:

[0010] An electromagnetic mechanism having a central hole, with a fixed base provided at one end of the central hole;

[0011] The first valve core has a first end that is slidably inserted into the central hole, and a second end that extends out of the central hole and has an annular seal. The first valve core has a central through hole that extends through the center along the axial direction.

[0012] The second valve core is inserted through the central through hole and spaced apart from the hole wall of the central through hole. The first end of the second valve core is slidably inserted into the fixed seat, and the second end of the second valve core extends out of the central through hole and has a sealing cap. The sealing cap is spaced apart from the annular seal.

[0013] The first elastic element is used to apply an elastic force to the first valve core to move the first valve core along a first axial direction, the first axial direction being opposite to the direction of the electromagnetic force acting on the first valve core when the electromagnetic mechanism is energized.

[0014] The second elastic element is used to apply an elastic force to the second valve core, causing the second valve core to move along the first axial direction.

[0015] Compared with the prior art, the electromagnetic valve of this utility model has the following advantages: Since the electromagnetic mechanism has a first valve core and a second valve core, with the first valve core correspondingly provided with a first elastic element and the second valve core correspondingly provided with a second elastic element, the electromagnetic valve can control the opening and closing of two channels through the separate actions of the first and second valve cores. Simultaneously, since the second valve core passes through the central hole of the first valve core and the sealing cap is located outside the central hole, it facilitates the assembly and disassembly of the first and second valve cores, thereby improving the overall ease of assembly and disassembly of the electromagnetic valve. Furthermore, the second valve core is spaced apart from the wall of the central hole, and the sealing cap is spaced apart from the annular seal, preventing contact between the second and first valve cores and eliminating friction. This avoids friction causing one to move while the other moves synchronously, ensuring the reliability of the electromagnetic mechanism's separate drive of the first and second valve cores, and thus ensuring the reliability of their movement. Finally, since the first end of the second valve core is slidably inserted into the fixed seat, it provides guidance for the axial movement of the second valve core, thereby ensuring the operational reliability of the second valve core.

[0016] In one embodiment, the minimum distance between the second valve core and the wall of the central perforation is d, where 0.7mm ≤ d ≤ 20mm.

[0017] In one embodiment, the sealing cap extends outward from the first valve core along its axial direction, and the sealing cap is spaced apart from the annular seal.

[0018] In one embodiment, the first valve core includes a first movable shaft, the first end of which is coaxial and slidably inserted into the central hole, the first movable shaft having a through central hole, the annular seal being sleeved on the second end of the first movable shaft, and the two ends of the first elastic member abutting against the ends of the annular seal and the electromagnetic mechanism, respectively.

[0019] In one embodiment, a side through hole communicating with the central through hole is provided on the side wall of the first moving shaft.

[0020] In one embodiment, the central perforation is flared at one end facing the sealing cap to form a flared portion;

[0021] And / or, the inner diameter of the annular seal is larger than the outer diameter of the sealing cap.

[0022] In one embodiment, the first moving shaft includes a first shaft portion and a second shaft portion coaxially connected. The end of the first shaft portion away from the second shaft portion is slidably inserted into the central hole. The outer diameter of the second shaft portion is larger than the outer diameter of the first shaft portion. The annular seal is sleeved on the outside of the second shaft portion. The flared portion extends from the first shaft portion to the end face of the second shaft portion.

[0023] In one embodiment, the side through hole is formed in the first shaft portion;

[0024] And / or, the flared portion includes a first flared portion and a second flared portion, the second flared portion being coaxially connected to the side of the first flared portion away from the fixed seat, the diameters of the first flared portion and the second flared portion gradually increasing in the direction toward the annular seal, and the cone angle of the first flared portion being smaller than the cone angle of the second flared portion, and the first flared portion extending from the first shaft portion to the second shaft portion, and the second flared portion penetrating the end face of the second shaft portion.

[0025] In one embodiment, the fixed seat is provided with a guide groove, the end of the second valve core away from the sealing cap is provided with a receiving groove, the first end of the second elastic member abuts against the bottom of the guide groove and the second end abuts against the bottom of the receiving groove;

[0026] Alternatively, the second elastic element is sleeved on the outside of the second valve core and at least partially located inside the central through hole, with the first end of the second elastic element abutting against the end of the fixed seat, the second end of the second elastic element abutting against the sealing cap, and the second elastic element being spaced apart from the hole wall of the central through hole.

[0027] In one embodiment, a first buffer pad is provided at the end of the fixed seat, and the first buffer pad is used to abut against the first end of the first valve core;

[0028] And / or, the fixed seat is provided with a guide groove, one end of the second valve core is slidably inserted into the guide groove, and a second buffer pad is provided at the bottom of the guide groove, the second buffer pad being used to abut against the first end of the second valve core.

[0029] In one embodiment, the first elastic element is used to apply an elastic force to the first valve core, causing the first valve core to move in a direction away from the electromagnetic mechanism; the second elastic element is used to apply an elastic force to the second valve core, causing the second valve core to move in a direction away from the electromagnetic mechanism.

[0030] The second technical problem mentioned above is solved by the following technical solution:

[0031] A gas distribution device includes a gas distribution seat and a solenoid valve on it. The gas distribution seat has a communicating air inlet channel and a mounting valve chamber. The gas distribution seat also has a first gas distribution channel, a second gas distribution channel, a first valve port communicating with the first gas distribution channel and the mounting valve chamber, and a second valve port communicating with the second gas distribution channel and the mounting valve chamber.

[0032] The electromagnetic mechanism is sealed and installed on the gas distribution seat, and the annular seal and the sealing cap are both located in the installation valve cavity. The annular seal can block or open the first valve port, and the sealing cap can block or open the second valve port.

[0033] Compared with the prior art, the gas distribution device of this utility model has the following advantages: by adopting the above-mentioned solenoid valve, the control reliability of the gas distribution device on and off the first gas distribution channel and the second gas distribution channel can be improved, thereby improving the gas distribution reliability and enhancing the reliability and control accuracy of the gas distribution device.

[0034] In one embodiment, the bottom of the mounting valve chamber is provided with the second valve port, and the bottom of the mounting valve chamber is provided with a boss portion surrounding the second valve port, and the first valve port is provided on one end face of the boss portion facing the electromagnetic mechanism.

[0035] The annular seal can abut against the end of the boss portion to block the first valve port. The sealing cap extends into the inside of the boss portion and is spaced apart from the inner wall of the boss portion. The side wall of the boss portion has a vent hole that communicates with the installation valve chamber.

[0036] The third technical problem mentioned above is solved by the following technical solution:

[0037] A gas-fired hot water device includes a gas distribution device as described above.

[0038] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: by adopting the above-mentioned gas-fired water heater, the reliability of segmented operation of the gas-fired water heater can be improved, the control accuracy of the gas-fired water heater can be improved, and the user experience of the gas-fired water heater can be enhanced. Attached Figure Description

[0039] Figure 1 A cross-sectional view of the gas distribution device provided in Embodiment 1 of this utility model when the solenoid valve is in the off state;

[0040] Figure 2 This is a cross-sectional view of the gas distribution device provided in Embodiment 1 of this utility model when the solenoid valve is in the gas distribution conduction state;

[0041] Figure 3A cross-sectional view of the gas distribution device provided in Embodiment 1 of this utility model when the solenoid valve is in the fully open state;

[0042] Figure 4 A cross-sectional view of the solenoid valve provided in Embodiment 1 of this utility model;

[0043] Figure 5 A cross-sectional view of a gas distribution device provided in another embodiment of the present invention when the solenoid valve is in the fully open state;

[0044] Figure 6 A cross-sectional view of the gas distribution device in the gas distribution conduction state of the solenoid valve is provided for Embodiment 2 of this utility model;

[0045] Figure 7 A cross-sectional view of the gas distribution device provided in Embodiment 2 of this utility model when the solenoid valve is in the fully open state;

[0046] Figure 8 This is a cross-sectional view of the gas distribution device provided in Embodiment 3 of this utility model when the solenoid valve is in the off state;

[0047] Figure 9 A cross-sectional view of the solenoid valve provided in Embodiment 4 of this utility model;

[0048] Figure 10 A cross-sectional view of the gas distribution device provided in Embodiment 5 of this utility model when the solenoid valve is in the fully open state;

[0049] Figure 11 This is a cross-sectional view of the gas distribution device provided in Embodiment Six of this utility model when the solenoid valve is in the off state.

[0050] Label Explanation:

[0051] 100. Solenoid valve; 200. Air distribution seat; 201. Air inlet passage; 202. First air distribution passage; 203. Second air distribution passage; 204. Valve mounting chamber; 205. Boss; 2051. First valve port; 2052. Inner ring; 2053. Outer ring; 2054. Vent hole; 206. Inner valve chamber; 207. Second valve port; 208. Annular protrusion;

[0052] 1. Electromagnetic mechanism; 11. Coil assembly; 111. Coil support; 112. Coil; 12. Magnetic guide frame; 121. Base plate; 122. Side plate; 13. Magnetic guide plate; 131. Inner magnetic guide plate; 132. Outer magnetic guide plate; 1321. Conical ring; 14. Second sealing ring; 15. Sleeve; 151. Center hole;

[0053] 2. First valve core; 21. First moving shaft; 211. Central through hole; 2111. Equal diameter section; 2112. First flared section; 2113. Second flared section; 2114. Tapered hole section; 212. Side through hole; 213. First shaft section; 214. Second shaft section; 22. Annular seal; 221. Inner sealing ring section; 222. Outer sealing ring section; 23. Mounting base; 231. First plate section; 232. Side plate section; 233. Second plate section; 234. Limiting edge section;

[0054] 3. Second valve core; 31. Second moving shaft; 311. Receiving groove; 32. Sealing cap; 321. Annular sealing part;

[0055] 4. Fixed seat; 41. Guide groove; 5. First buffer pad; 6. Second buffer pad; 7. First sealing ring; 8. First elastic element; 9. Second elastic element. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Example 1

[0061] This embodiment provides a gas distribution device that can be applied to gas-fired water heaters to control the segmented combustion of the gas-fired water heaters and improve the reliability of the segmented combustion of the gas-fired water heaters.

[0062] like Figures 1 to 4 As shown, the gas distribution device includes a gas distribution seat 200 and a solenoid valve 100. The gas distribution seat 200 has an intake channel 201, a first gas distribution channel 202, and a second gas distribution channel 203. The solenoid valve 100 is installed on the gas distribution seat 200 and can control the first gas distribution channel 202 to selectively connect with the intake channel 201 and the second gas distribution channel 203 to selectively connect with the intake channel 201, thereby enabling the gas entering the intake channel 201 to selectively enter the first gas distribution channel 202 and the second gas distribution channel 203.

[0063] The solenoid valve 100 includes an electromagnetic mechanism 1, a fixed base 4, a first valve core 2, a second valve core 3, a first elastic element, and a second elastic element. The electromagnetic mechanism 1 has a central hole 151. The fixed base 4 is coaxially mounted on the first end of the central hole 151 and seals the first end of the central hole 151. The first end of the first valve core 2 is slidably inserted into the central hole 151, and the second end extends out of the central hole 151 and has an annular seal 22. The first valve core 2 is coaxially arranged with the central hole 151. The first valve core 2 has a central through hole 211 that extends axially. The second valve core 3 is coaxially arranged with the first valve core 2. The second valve core 3 is slidably inserted into the central through hole 211 and spaced apart from the hole wall of the central through hole 211. The first end of the second valve core 3 is slidably inserted into the fixed base 4, and the second end of the second valve core 3 extends out of the central through hole 211 and has a sealing cap 32. The sealing cap 32 is spaced apart from the annular seal 22. The first elastic element 8 is used to apply an elastic force to the first valve core 2 to make the first valve core 2 move along the first axial direction, which is opposite to the direction of the electromagnetic force acting on the first valve core 2 when the electromagnetic mechanism 1 is energized; the second elastic element 9 is used to apply an elastic force to the second valve core 3 to make the second valve core 3 move along the first axial direction.

[0064] The electromagnetic mechanism 1 has a first driving state and a second driving state with different input current magnitudes. When the electromagnetic mechanism 1 is in the first driving state, the electromagnetic force on one of the first valve core 2 and the second valve core 3 is greater than the elastic force of the corresponding first elastic element 8 or the second elastic element 9, and the electromagnetic force on the other of the first valve core 2 and the second valve core 3 is less than the elastic force of the corresponding first elastic element 8 or the second elastic element 9. When the electromagnetic mechanism 1 is in the second driving state, the electromagnetic force on both the first valve core 2 and the second valve core 3 is greater than the elastic force they receive.

[0065] The air distribution seat 200 has a communicating air intake channel 201 and a mounting valve chamber 204. The air distribution seat 200 also has a first air distribution channel 202, a second air distribution channel 203, a first valve port 2051 communicating between the first air distribution channel 202 and the mounting valve chamber 204, and a second valve port 207 communicating between the second air distribution channel 203 and the mounting valve chamber 204. The electromagnetic mechanism 1 is sealed and installed in the air distribution seat 200, and both the annular seal 22 and the sealing cap 32 are located within the mounting valve chamber 204. The annular seal 22 can block or open the first valve port 2051, and the sealing cap 32 can block or open the second valve port 207.

[0066] The solenoid valve 100 provided in this embodiment, because the electromagnetic mechanism 1 has a first driving state that drives only the first valve core 2 or the second valve core 3 and a second driving state that drives the first valve core 2 and the second valve core 3 to act simultaneously, allows the solenoid valve 100 to control the opening and closing of two channels through the separate actions of the first valve core 2 and the second valve core 3; at the same time, because the second valve core 3 passes through the central through hole 211 of the first valve core 2 and the sealing cap 32 is located outside the central through hole 211, it is convenient to disassemble and assemble the first valve core 2 and the second valve core 3, thereby improving the overall ease of disassembly and assembly of the solenoid valve 100; furthermore, the second valve... The second valve core 3 is spaced apart from the wall of the central through hole 211, and the sealing cap 32 is always spaced apart from the annular seal 22, so that the second valve core 3 and the first valve core 2 will not come into contact, thus eliminating friction between them. This prevents friction from causing one of them to move synchronously with the other, ensuring the reliability of the electromagnetic mechanism 1 in driving the first valve core 2 and the second valve core 3 respectively, and facilitating the reliability of the movement of the first valve core 2 and the second valve core 3. Finally, by setting the first end of the second valve core 3 to slide into the fixed seat 4, it is possible to provide guidance for the axial movement of the second valve core 3, thereby ensuring the operational reliability of the second valve core 3.

[0067] In one embodiment, the first axial direction is from the electromagnetic mechanism 1 toward the annular seal 22. That is, when the electromagnetic mechanism 1 is energized, it drives the first valve core 2 and / or the second valve core 3 to move toward the fixed seat 4 to open the corresponding first valve port 2051 or second valve port 207. The first elastic member 8 is used to apply an elastic force to the first valve core 2 to move it away from the electromagnetic mechanism 1, so that the first valve core 2 is held or returned to the position blocking the first valve port 2051. The second elastic member 9 is used to apply an elastic force to the second valve core 3 to move it away from the electromagnetic mechanism 1, so that the second valve core 3 is held or returned to the position blocking the second valve port 207. That is, the solenoid valve 100 is a normally closed solenoid valve.

[0068] Specifically, when the electromagnetic mechanism 1 is de-energized, the annular seal 22 blocks the first valve port 2051 and the sealing cap 32 blocks the second valve port 207, meaning that the air intake channel 201 is not connected to the first air distribution channel 202, and the air intake channel 201 is not connected to the second air distribution channel 203. When the electromagnetic mechanism 1 is in the first driving state, one of the annular seal 22 and the sealing cap 32 opens the corresponding first valve port 2051 or second valve port 207, while the other of the annular seal 22 and the sealing cap 32 blocks... The corresponding first valve port 2051 or second valve port 207 is used. At this time, the solenoid valve 100 is in the gas distribution conduction state, and the air intake channel 201 is connected to one of the first gas distribution channel 202 and the second gas distribution channel 203. When the electromagnetic mechanism 1 is in the second driving state, the annular seal 22 opens the first valve port 2051 and the sealing cap 32 opens the second valve port 207. At this time, the solenoid valve 100 is in the fully conduction state, and the air intake channel 201 is connected to both the first gas distribution channel 202 and the second gas distribution channel 203.

[0069] In another embodiment, the first axial direction is from the annular seal 22 toward the electromagnetic mechanism 1, i.e., when the electromagnetic mechanism 1 is energized, it drives the first valve core 2 and / or the second valve core 3 to move away from the fixed seat 4 to block the corresponding first valve port 2051 or second valve port 207. The first elastic member 8 is used to apply an elastic force to the first valve core 2 to cause it to move toward the electromagnetic mechanism 1, so that the first valve core 2 is held or returned to the position where the first valve port 2051 is open; the second elastic member 9 is used to apply an elastic force to the second valve core 3 to cause it to move toward the electromagnetic mechanism 1, so that the second valve core 3 is held or returned to the position where the second valve port 207 is open. That is, the solenoid valve 100 is a normally open solenoid valve.

[0070] This utility model takes the solenoid valve 100 as a normally closed solenoid valve as an example to describe the structure of the solenoid valve 100 in detail. However, it is understood that when the solenoid valve 100 is a normally open solenoid valve, the structure of the solenoid valve 100 can refer to the structure provided by this utility model.

[0071] It is worth noting that the solenoid valve 100 provided by this utility model can not only be applied in gas distribution devices to achieve independent on / off control of the first gas distribution channel 202 and the second gas distribution channel 203 in conjunction with the gas distribution seat 200, but also in other scenarios that require on / off control of two channels. That is, the gas distribution seat 200 can be other valve body structures. This utility model uses the application of the solenoid valve 100 in a gas distribution device as an example to introduce the structure of the gas distribution seat 200 and the solenoid valve 100. The application structure of the solenoid valve 100 in other scenarios can be set with reference to the structure in this utility model, and this utility model will not list them all.

[0072] The mounting valve chamber 204 passes through one side of the gas distribution seat 200 and forms a mounting opening. The electromagnetic mechanism 1 is sealed and installed at the mounting opening, and the electromagnetic mechanism 1 is located on the outside of the gas distribution seat 200. The side wall of the mounting valve chamber 204 opposite to the mounting opening forms the bottom of the mounting valve chamber 204. The first valve core 2 and the second valve core 3 extend into the mounting valve chamber 204 through the mounting opening.

[0073] The bottom of the mounting valve chamber 204 is provided with a second valve port 207, and the bottom of the mounting valve chamber 204 is provided with a boss portion 205 surrounding the second valve port 207. The end face of the boss portion 205 facing the electromagnetic mechanism 1 is provided with a first valve port 2051. The annular seal 22 can abut against the end of the boss portion 205 to block the first valve port 2051. The sealing cap 32 extends into the inside of the boss portion 205 and is spaced apart from the inner wall of the boss portion 205.

[0074] This arrangement allows the first valve port 2051 to be spaced around the second valve port 207 in a projection plane perpendicular to the axis of the first valve core 2. This arrangement avoids interference between the first valve port 2051 and the second valve port 207 while increasing the mating position between the first valve port 2051 and the annular seal 22. This increases the ventilation area of ​​the first valve port 2051, ensuring the ventilation flow at the first valve port 2051. It also helps to ensure the control accuracy of the annular seal 22 in opening or closing the first valve port 2051.

[0075] In one embodiment, the cavity formed by the boss portion 205 is an inner valve cavity 206. The side wall of the boss portion 205 has a vent hole 2054 that connects to the mounting valve cavity 204, that is, the vent hole 2054 connects the mounting valve cavity 204 and the inner valve cavity 206. Further, in the projection plane perpendicular to the axis of the first valve core 2, the vent hole 2054 is offset from the first valve port 2051, that is, the first valve port 2051 is an open annular structure.

[0076] This configuration allows the gas entering the intake passage 201 to pass through the vent hole 2054 into the inner valve chamber 206 when the annular seal 22 blocks the first valve port 2051 and the sealing cap 32 opens the second valve port 207, and then flow to the second gas distribution passage 203 through the second valve port 207; when the sealing cap 32 blocks the second valve port 207 and the annular seal 22 opens the first valve port 2051, the gas entering the intake passage 201 can pass through the installation valve chamber 204 and the first valve port 2051 into the first gas distribution passage 202.

[0077] That is, the vent 2054 allows the solenoid valve 100 to be configured to first control the first valve core 2 to open the first valve port 2051, and then control the second valve core 3 to open the second valve port 207; or it can be configured to first control the second valve core 3 to open the second valve port 207, and then control the first valve core 2 to open the first valve port 2051, which improves the design flexibility and versatility of the solenoid valve 100. In other embodiments, the boss portion 205 may not have the vent 2054. In this case, when the solenoid valve 100 is in the gas distribution and conduction state, the annular seal 22 opens the first valve port 2051, and the sealing cap 32 blocks the second valve port 207.

[0078] In one embodiment, the boss portion 205 includes an inner ring portion 2052 located inside the second valve port 207 and an outer ring portion 2053 located outside the first valve port 2051. The end faces of the inner ring portion 2052 and the outer ring portion 2053 are both arc surfaces. Thus, when the annular seal 22 moves towards the first valve port 2051, the arc surfaces of the inner ring portion 2052 and the outer ring portion 2053 can enhance the squeezing effect on the annular seal 22, thereby avoiding gaps between the inner ring portion 2052 and the outer ring portion 2053 and the annular seal 22, and improving the sealing reliability of the annular seal 22 on the first valve port 2051. In one embodiment, the bottom of the mounting valve cavity 204 has an annular protrusion 208 surrounding the second valve port 207. The end of the annular protrusion 208 facing the annular seal 22 has an arc structure, and the sealing cap 32 abuts against the annular protrusion 208 to seal the second valve port 207. By setting the annular protrusion 208, the compression effect of the sealing cap 32 can be enhanced, thereby ensuring the tightness of the sealing cap 32 in sealing the second valve port 207.

[0079] The electromagnetic mechanism 1 includes a coil assembly 11, a magnetic guide assembly, and a sleeve 15. The coil assembly 11 includes a coil support 111 with a central through hole, a coil 112 mounted on the coil support 111, and a plastic-encapsulated shell covering the outside of the coil support 111 and the coil 112. The magnetic guide assembly includes a magnetic guide frame 12 and a magnetic guide plate 13. The magnetic guide frame 12 includes a base plate portion 121 and two side plate portions 122 connected to form a U-shaped structure. The base plate portion 121 is connected to the end of the coil assembly 11 away from the annular seal 22, and the magnetic guide plate 13 is connected to the ends of the two side plate portions 122 away from the base plate portion 121. In other words, the coil assembly 11 is axially sandwiched between the base plate portion 121 and the magnetic guide plate 13. The sleeve 15 is inserted into the central through hole, and the inner cavity of the sleeve 15 forms a central hole 151; the fixing seat 4 is installed inside the sleeve 15 and its first end is fastened to the base plate 121; the first valve core 2 is slidably inserted into the sleeve 15 so that the sleeve 15 guides the movement of the first valve core 2. A sealing ring is provided between the magnetic plate 13 and the open end face of the mounting opening to prevent gas leakage through the mounting position of the solenoid valve 100.

[0080] The end of the fixed seat 4 away from the first valve core 2 is installed on the base plate 121, and the end of the sleeve 15 away from the first valve core 2 abuts against the base plate 121. To reduce the probability of gas leakage, a sealing ring groove is provided on the outer wall of the fixed seat 4, and a first sealing ring 7 is installed in the sealing ring groove. The first sealing ring 7 abuts against the inner wall of the sleeve 15.

[0081] In one embodiment, the magnetic plate 13 includes a magnetic inner plate 131 and a magnetic outer plate 132. The magnetic inner plate 131 is sandwiched between the magnetic outer plate 132 and the end face of the coil assembly 11. The magnetic outer plate 132 is connected to two side plate portions 122. The magnetic inner plate 131 has an inner through hole coaxially communicating with the central hole 151. The magnetic outer plate 132 has an outer through hole coaxially communicating with the central hole 151. The magnetic outer plate 132 has a conical ring portion 1321 that surrounds the outer through hole and protrudes away from the magnetic inner plate 131. The conical ring portion 1321 and the magnetic inner plate 131 surround and form a mounting ring groove. The end of the sleeve 15 facing the annular seal 22 extends into the mounting ring groove and can abut against the inner wall of the conical ring portion 1321. A second sealing ring 14 is provided in the mounting groove. The second sealing ring 14 abuts against the inner wall of the conical ring portion 1321, the sleeve 15, and the magnetic inner plate 131 to seal the gap between the magnetic component and the sleeve 15 and prevent gas leakage through the gap between the magnetic inner plate 131 and the magnetic outer plate 132. At the same time, the conical ring portion 1321 can also stop the sleeve 15 from moving away from the fixed seat 4, ensuring the stability and reliability of the sleeve 15.

[0082] In other embodiments, the magnetic plate 13 may also be a single plate structure, and the sleeve 15 includes a main cylinder portion inserted inside the coil bracket 111. The end of the main cylinder portion away from the fixing seat 4 extends outward to form a mounting plate portion. The mounting plate portion is partially raised in a direction away from the coil bracket 111 to form a raised portion, and the first elastic member 23 is sleeved on the outside of the raised portion.

[0083] It is worth noting that the specific structure of the electromagnetic mechanism 1 described above is only an exemplary structure. The existing structures of the electromagnetic mechanism 1 used in the solenoid valve 100 can all be applied to this utility model. Furthermore, the principle by which the electromagnetic mechanism 1 drives the first valve core 2 and the second valve core 3 is existing technology, and this embodiment does not limit or elaborate on it.

[0084] The first valve core 2 includes a first movable shaft 21 and the aforementioned annular seal 22. The first end of the first movable shaft 21 is slidably inserted into the central hole 151, and the second end of the first movable shaft 21 is fitted with the annular seal 22. Preferably, the annular seal 22 is interference-fitted onto the outside of the first movable shaft 21. The two ends of the first elastic member 23 abut against the ends of the annular seal 22 and the electromagnetic mechanism 1, respectively. The first elastic member 23 is always in a compressed state, so that the first valve core 2, under the action of the first elastic member 23, remains or returns to the closed position of closing the first valve port 2051. The mating structure of the first movable shaft 21 and the annular seal 22 can refer to the mating structure of other existing movable shafts and sealing caps; this utility model does not limit this.

[0085] The first movable shaft 21 is slidably fitted with the central hole 151, so that the wall of the central hole 151 guides the sliding of the first movable shaft 21. Furthermore, there is a sliding fit clearance d1 between the outer wall of the first movable shaft 21 and the wall of the central hole 151. The specific amount of the sliding fit clearance d1 can be specifically set with reference to the clearance fit requirements between the hole and the shaft.

[0086] The central perforation 211 is widened at one end facing the fixed seat 4 to form a tapered hole 2114, with the larger end of the tapered hole 2114 facing the fixed seat 4. The tapered hole 2114 helps to reduce the contact area between the first moving shaft 21 and the fixed seat 4 while ensuring the overall structural strength of the first moving shaft 21, thereby reducing the collision between the two during the operation of the first valve core 2 and decreasing the noise during the operation of the solenoid valve 100. Furthermore, when the solenoid valve 100 is in the fully open state, the first end of the first moving shaft 21 abuts against the fixed seat 4, thereby restricting the movement of the first moving shaft 21 in a direction away from the first valve port 2051, providing a limit for the first moving shaft 21 and ensuring the stability of the first valve core 2.

[0087] A guide groove 41 is provided on the fixed base 4, and the first end of the second valve core 3 is slidably inserted into the guide groove 41. Specifically, the second valve core 3 includes a second moving shaft 31 and the aforementioned sealing cap 32. The second moving shaft 31 is coaxially inserted into the central through hole 211, and the first end of the second moving shaft 31 is slidably inserted into the guide groove 41. The second end of the second moving shaft 31 extends out of the annular sealing member 22 and is coaxially connected to the sealing cap 32. There is a clearance between the outer wall of the second moving shaft 31 and the inner wall of the central through hole 211, and the clearance is arranged around the second moving shaft 31. The second elastic member 33 is used to apply an elastic force away from the electromagnetic mechanism 1 to the second moving shaft 31 or the sealing cap 32, so that the second valve core 3 is maintained or returned to the closed position of blocking the second valve port 207 under the action of the second elastic member 33. Furthermore, when the solenoid valve 100 is in the fully open state, the first end of the second moving shaft 31 presses against the bottom of the guide groove 41 to restrict the second valve core 3 from continuing to move in a direction away from the second valve port 207.

[0088] The minimum clearance value for the clearance is d, which is 0.7mm ≤ d ≤ 25mm. d can be, but is not limited to, 0.7mm, 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, 19mm, 21mm, 23mm, or 25mm. Preferably, 2mm ≤ d ≤ 15mm, to avoid the problem of an excessively large clearance leading to an increase in the diameter of the first moving shaft 21, and to avoid the problem of the first moving shaft 21 and the second moving shaft 31 contacting due to an insufficient clearance to compensate for machining or assembly errors.

[0089] In one embodiment, the second moving shaft 31 and the groove wall of the guide groove 41 have a fitting clearance d2, where 1.5×d1+d2≤d≤30×d1+d2.

[0090] In one embodiment, a receiving groove 311 is provided at the first end of the second moving shaft 31, and the second elastic member 33 is housed in the receiving groove 311. The first end of the second elastic member 33 abuts against the bottom of the guide groove 41, and the second end of the second elastic member 33 abuts against the bottom of the receiving groove 311. This arrangement improves the ease of installation of the second elastic member 33 and avoids interference between the second elastic member 33 and the valve core. At the same time, it increases the space for the second elastic member 33 to be placed by providing the receiving groove 311 without changing the size of the fixed seat 4 and the second moving shaft 31, thereby facilitating the selection of the second elastic member 33 and better ensuring that the second elastic member 33 has a suitable elastic coefficient.

[0091] It is worth noting that when the cross-sections of the first moving shaft 21 and the second moving shaft 31 are similar or equal, the elastic coefficients of the first elastic element 23 and the second elastic element 33 should differ significantly. Therefore, when a specific current is applied to the electromagnetic mechanism 1, since the magnetic attraction force of the electromagnetic mechanism 1 on the first moving shaft 21 and the second moving shaft 31 is directly opposite to their cross-sectional areas, when the cross-sectional areas of the first moving shaft 21 and the second moving shaft 31 are the same or approximately the same, the magnetic force applied by the electromagnetic mechanism 1 to the first moving shaft 21 and the second moving shaft 31 is the same. In this case, the order of movement of the first valve core 2 and the second valve core 3 should be controlled by the difference in the elastic coefficients of the first elastic element 23 and the second elastic element 33. Specifically, the moving shaft corresponding to the elastic element with the smaller elastic coefficient is attracted first.

[0092] When the elastic coefficients of the first elastic element 23 and the second elastic element 33 are equal or close, the cross sections of the first moving shaft 21 and the second moving shaft 31 should be set to have a large difference, so as to control that when the electromagnetic mechanism 1 is energized, the magnetic force acting on the first moving shaft 21 and the second moving shaft 31 is significantly different, thereby causing the first moving shaft 21 or the second moving shaft 31 with the larger cross section to be attracted first.

[0093] In one embodiment, when the solenoid valve 100 is in the fully open state, the axial distance between the annular seal 22 and the sealing cap 32 on the first moving shaft 21 is D, where 0.5mm ≤ D ≤ 15mm. This setting avoids the problem of an excessively large D leading to an increase in the overall axial dimension of the solenoid valve 100, and also avoids the problem of an excessively small D leading to difficulty in compensating for machining or assembly errors, which could result in the annular seal 22 and the sealing cap 32 not contacting each other. At the same time, it effectively ensures that the annular seal 22 and the sealing cap 32 are always separated, guaranteeing the smooth operation of the first valve core 2 and the second valve core 3.

[0094] In one embodiment, when the solenoid valve 100 is in the fully open state, the sealing caps 32 are all located within the boss portion 205, so that there is a large gap between the annular seal 22 and the sealing caps 32, which facilitates the flow of gas through the gap between them to the second valve port 207. In other embodiments, such as Figure 5 As shown, when the solenoid valve 100 is in the fully open state, the sealing cap 32 can extend out of the outside of the boss portion 205, thereby reducing the axial spacing requirement between the annular seal 22 and the sealing cap 32. However, it is necessary to ensure that the annular seal 22 and the sealing cap 32 are always separated in the axial direction.

[0095] This embodiment also provides a gas-fired water heater, including the aforementioned gas distribution device. The gas-fired water heater provided in this embodiment enhances the operational control precision of the gas-fired water heater and improves the user experience.

[0096] Example 2

[0097] This embodiment provides a solenoid valve 100 and a gas distribution device including the solenoid valve 100. The solenoid valve 100 provided in this embodiment is basically the same as that in the above embodiments, with only some differences in configuration. This embodiment will not describe the same structure as the above embodiments again.

[0098] like Figure 6 and Figure 7 As shown, in this embodiment, a side through hole 212 is provided on the outer side wall of the first moving shaft 21, which connects to the central through hole 211. That is, the side through hole 212 connects the central through hole 211 and the mounting valve chamber 204. The side through hole 212 is provided so that when the annular seal 22 blocks the first valve port 2051 and the sealing cap 32 opens the second valve port 207, the gas in the mounting valve chamber 204 enters the second gas distribution channel 203 in sequence through the side through hole 212, the central through hole 211, the inner valve chamber 206 and the second valve port 207. This ensures the smooth flow of gas when the second valve core 3 is first attracted by the electromagnetic mechanism 1.

[0099] That is, the solenoid valve 100 provided in this embodiment can be configured such that the electromagnetic mechanism 1 first attracts the first valve core 2 to move towards the electromagnetic mechanism 1, or it can be configured such that the electromagnetic mechanism 1 first attracts the second valve core 3 to move towards the electromagnetic mechanism 1, thereby improving the design flexibility of the solenoid valve 100.

[0100] The side through holes 212 are preferably provided at least two at circumferential intervals along the first moving shaft 21 to further ensure ventilation flow and improve ventilation smoothness.

[0101] In this embodiment, a vent hole 2054 may be provided on the side wall of the boss portion 205, that is, the gas can enter the inner valve cavity 206 through the side through hole 212 and the vent hole 2054 respectively, ensuring the intake volume. In other embodiments, the vent hole 2054 may not be provided on the side wall of the boss portion 205. In this embodiment, the end of the central through hole 211 facing the sealing cap 32 is flared in the direction towards the sealing cap 32 to form a flared portion, which facilitates guiding the gas entering through the side through hole 212 to the second valve port 207, improving the smoothness of gas flow.

[0102] In this embodiment, the inner diameter of the annular seal 22 is larger than the outer diameter of the sealing cap 32. Therefore, in a projection plane perpendicular to the axial direction of the first valve core 2, there is a gap between the orthographic projection of the annular seal 22 and the orthographic projection of the sealing cap 32. This gap facilitates the outflow of gas within the central perforation 211, further improving the smoothness of gas flow. In other embodiments, the inner diameter of the annular seal 22 may be less than or equal to the outer diameter of the sealing cap 32.

[0103] In this embodiment, the first moving shaft 21 includes a first shaft portion 213 and a second shaft portion 214 coaxially connected. The first shaft portion 213 is slidably inserted into the central hole 151. The outer diameter of the second shaft portion 214 is larger than the outer diameter of the first shaft portion 213. An annular seal 22 is sleeved on the outside of the second shaft portion 214, and the flared portion extends from the first shaft portion 213 to the end face of the second shaft portion 214. This arrangement can increase the difference between the inner diameter of the annular seal 22 and the outer diameter of the sealing cap 32 without increasing the size of the central hole 151, thereby increasing the gap between the annular seal 22 and the sealing cap 32 and improving the smoothness of the gas flow from the central perforation 211 to the second valve port 207.

[0104] Furthermore, the side through hole 212 is opened in the first shaft portion 213 to avoid interference between the setting of the side through hole 212 and the setting of the sealing cap 32. At the same time, the side through hole 212 is closer to the side of the flared portion facing the fixed seat 4, thereby improving the airflow guiding effect of the flared portion entering the central through hole 211 through the side through hole 212.

[0105] The flared portion includes a first flared portion 2112 and a second flared portion 2113. The second flared portion 2113 is coaxially connected to the side of the first flared portion 2112 away from the fixed seat 4. The diameters of the first flared portion 2112 and the second flared portion 2113 gradually increase in the direction toward the annular seal 22. The cone angle of the first flared portion 2112 is smaller than the cone angle of the second flared portion 2113. The first flared portion 2112 extends from the first shaft portion 213 to the second shaft portion 214. The second flared portion 2113 penetrates the end face of the second shaft portion 214.

[0106] This configuration ensures that the end of the central perforation 211 near the sealing cap 32 has a relatively large outer diameter while extending the overall length of the flared section, thereby improving the gas flow guiding effect. Simultaneously, placing the side through-hole 212 at the first flared portion 2112 facilitates the flow of gas entering through the side through-hole 212. Furthermore, the end of the equal-diameter portion 2111 furthest from the first flared portion 2112 is coaxially connected to the conical ring portion 1321. In other embodiments, the central perforation 211 may not have the first flared portion 2112, and the side through-hole 212 may penetrate the sidewall of the second flared portion 2113 or the equal-diameter portion 2111.

[0107] Furthermore, the central perforation 211 includes a constant diameter portion 2111 coaxially connected in the direction toward the sealing cap 32. The constant diameter portion 2111 is connected to the side of the flared portion away from the fixed seat 4. The diameter of the constant diameter portion 2111 is equal to the minimum diameter of the flared portion, so as to ensure the overall structural stability of the first moving shaft 21.

[0108] The other structures of the solenoid valve 100 and the gas distribution device can be set with reference to the above embodiments, and will not be described again in this embodiment.

[0109] This embodiment also provides a gas-fired water heater, including the aforementioned gas distribution device. The gas-fired water heater provided in this embodiment enhances the operational control precision of the gas-fired water heater and improves the user experience.

[0110] Example 3

[0111] This embodiment provides a solenoid valve 100 and a gas distribution device including the solenoid valve 100. The structure of the solenoid valve 100 provided in this embodiment is the same as that in the above embodiment, with only some differences in the configuration. This embodiment will not describe the structure that is the same as that in the above embodiment again.

[0112] like Figure 8 As shown, in this embodiment, the first valve core 2 further includes a mounting base 24. The mounting base 24 is sleeved on the outside of the first moving shaft 21 and disposed on the side of the annular seal 22 facing the electromagnetic mechanism 1. The second end of the first elastic member 23 abuts against the mounting base 24. By providing the mounting base 24, the wear of the first elastic member 23 on the annular seal 22 can be reduced, thereby improving the service life of the annular seal 22.

[0113] The end of the annular seal 22 facing the electromagnetic mechanism 1 includes a first end face, a side annular face, and a second end face connected from the inside to the outside. The side annular face connects the outer periphery of the first end face and the inner periphery of the second end face. The first end face is closer to the electromagnetic mechanism 1 than the second end face. The mounting base 24 includes a first plate portion 231, a side plate portion 232, and a second plate portion 233 coaxially connected from the inside to the outside. The first plate portion 231 fits against the first end face, the side plate portion 232 fits against the side annular face, and the second plate portion 233 fits against the second end face. That is, the shape of the mounting base 24 is consistent with the shape of the annular seal 22 facing the electromagnetic mechanism 1, thereby improving the installation stability and reliability of the mounting base 24 on the annular seal 22. The first elastic member 23 abuts against the second plate portion 233.

[0114] Mounting base 24 can be glued, snapped, or riveted to the annular seal 22 or the first moving shaft 21. Other structures of the solenoid valve 100 and the gas distribution device can be set with reference to the above embodiments, and will not be described again in this embodiment.

[0115] The other structures of the solenoid valve 100 and the gas distribution device can be set with reference to the above embodiments, and will not be described again in this embodiment.

[0116] This embodiment also provides a gas-fired water heater, including the aforementioned gas distribution device. The gas-fired water heater provided in this embodiment enhances the operational control precision of the gas-fired water heater and improves the user experience.

[0117] Example 4

[0118] This embodiment provides a solenoid valve 100 and a gas distribution device including the solenoid valve 100. The solenoid valve 100 provided in this embodiment is the same as that in the above embodiment and is a further improvement based on the above embodiment. Therefore, the structure of this embodiment is not repeated in the same way as that in the above embodiment.

[0119] like Figure 9 As shown, in this embodiment, a first buffer pad 5 is provided at the first end of the fixed seat 4 facing the first valve core 2, and the first buffer pad 5 is used to abut against the first valve core 2; and / or, a second buffer pad 6 is provided at the bottom of the guide groove 41, and the second buffer pad 6 abuts against the first end of the second valve core 3. By providing the first buffer pad 5, the impact between the first valve core 2 and the fixed seat 4 can be reduced through the elasticity of the first buffer pad 5. By providing the second buffer pad 6, the impact between the second valve core 3 and the bottom of the guide groove 41 can be reduced through the elasticity of the second buffer pad 6, thereby effectively reducing the noise of the solenoid valve 100 during operation, extending the service life of the first valve core 2, the second valve core 3 and the fixed seat 4, and improving the user experience of the solenoid valve 100.

[0120] In other embodiments, only the first buffer pad 5 or only the second buffer pad 6 may be provided. To improve the installation stability of the first buffer pad 5, a mounting ring groove is provided on the end face of the fixing base 4, and the first buffer pad 5 is installed in the mounting ring groove so that the mounting ring groove provides positioning for the installation of the first buffer pad 5. The end face of the first buffer pad 5 is preferably flush with the end face of the fixing base 4. The first buffer pad 5 is preferably adhered to the bottom of the mounting ring groove to prevent the first buffer pad 5 from moving.

[0121] The outer contour of the second buffer pad 6 is the same as the cross-sectional shape of the guide groove 41, so that the second buffer pad 6 is embedded in the guide groove 41, preventing the second buffer pad 6 from abutting against the bottom of the guide groove 41. Furthermore, the second buffer pad 6 is bonded to the bottom of the guide groove 41 to ensure the stability of the second buffer pad 6. The first end of the second elastic member 33 abuts against the second buffer pad 6.

[0122] In this embodiment, the first valve core 2 further includes a mounting base 24, which is disposed on the side of the annular seal 22 facing the electromagnetic mechanism 1, and the second end of the first elastic member 23 abuts against the mounting base 24. The mounting base 24 includes a first plate portion 231, a side plate portion 232, a second plate portion 233, and a limiting edge portion 234 connected sequentially from the inside to the outside. The limiting edge portion 234, the second plate portion 233, and the side plate portion 232 together form a limiting groove, and the second end of the first elastic member 23 is located in the limiting groove, thereby preventing the first elastic member 23 from coming out of the mounting base 24 and ensuring the stability of the first elastic member 23.

[0123] In this embodiment, the first plate portion 231 can be separated from the end face of the annular seal 22, or it can be attached to the end face of the annular seal 22.

[0124] The other structures of the solenoid valve 100 and the gas distribution device can be set with reference to the above embodiments, and will not be described again in this embodiment.

[0125] This embodiment also provides a gas-fired water heater, including the aforementioned gas distribution device. The gas-fired water heater provided in this embodiment enhances the operational control precision of the gas-fired water heater and improves the user experience.

[0126] Example 5

[0127] This embodiment provides a solenoid valve 100 and a gas distribution device including the solenoid valve 100. The basic structure of the solenoid valve 100 provided in this embodiment is the same as that in the above embodiments, with only some differences in the configuration. This embodiment will not describe the same structure as the above embodiments again.

[0128] like Figure 10 As shown, in this embodiment, the second elastic element 33 is sleeved outside the second valve shaft 31 and located inside the central through hole 211. The first end of the second elastic element 33 abuts against the fixed seat 4, and the second end of the second elastic element 33 abuts against the sealing cap 32. There is a gap between the second elastic element 33 and the wall of the central through hole 211. With this arrangement, since the second elastic element 33 is sleeved outside the second moving shaft 31, the second elastic element 33 can be made of a spring with a larger diameter, which helps to ensure that the elastic force of the second elastic element 33 is sufficient, and further improves the operational reliability of the second valve core 3. Other structures of the solenoid valve 100 and the gas distribution device can be set with reference to the above embodiment, and will not be described again in this embodiment.

[0129] This embodiment also provides a gas-fired water heater, including the aforementioned gas distribution device. The gas-fired water heater provided in this embodiment enhances the operational control precision of the gas-fired water heater and improves the user experience.

[0130] Example 6

[0131] This embodiment provides a solenoid valve 100 and a gas distribution device including the solenoid valve 100. The basic structure of the solenoid valve 100 provided in this embodiment is the same as that in the above embodiments, with only some differences in the configuration. This embodiment will not describe the same structure as the above embodiments again.

[0132] like Figure 11As shown, in this embodiment, the annular seal 22 has an inner sealing ring 221 and an outer sealing ring 222 protruding from the end away from the central hole 151. The outer sealing ring 222 is coaxially and spaced outside the inner sealing ring 221. The inner sealing ring 221 abuts against the inner end face of the first valve port 2051, and the outer sealing ring 222 abuts against the outer end face of the first valve port 2051. Thus, the inner sealing ring 221 and the outer sealing ring can seal the first valve port 2051. At the same time, by providing the inner sealing ring 221 and the outer sealing ring 222, the compression effect between the end face of the first valve port 2051 and the annular seal 22 can be enhanced, thereby improving the sealing reliability of the annular seal 22 on the first valve port 2051.

[0133] The sealing cap 32 has an annular sealing part 321 protruding from one end away from the central hole 151. The annular sealing part 321 surrounds the second valve port 207 and abuts against the opening end face of the second valve port 207. The annular sealing part 321 can enhance the squeezing effect with the opening end face of the second valve port 207, thereby helping to ensure the reliability and tightness of the sealing cap 32 in sealing the second valve port 207.

[0134] By providing an inner sealing ring 221 and an outer sealing ring 222 on the annular seal 22, and by providing an annular sealing part 321 on the sealing cap 32, the opening surfaces of the first valve port 2051 and the second valve port 207 can be planar structures, reducing the processing difficulty of the gas distribution seat 200 and reducing the cost of the gas distribution device.

[0135] In other embodiments, only the annular seal 22 may have an inner sealing ring portion 221 and an outer sealing ring portion 222, while the end face of the sealing cap 32 may be a planar structure. In yet another embodiment, only the sealing cap 32 may have an annular sealing portion 321, while the end face of the annular seal 22 may be a planar structure.

[0136] The other structures of the solenoid valve 100 and the gas distribution device can be set with reference to the above embodiments, and will not be described again in this embodiment.

[0137] This embodiment also provides a gas-fired water heater, including the aforementioned gas distribution device. The gas-fired water heater provided in this embodiment enhances the operational control precision of the gas-fired water heater and improves the user experience.

[0138] 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.

[0139] 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. An electromagnetic valve characterized by comprising: The solenoid valve includes: The electromagnetic mechanism (1) has a central hole (151), and a fixed seat (4) is provided at one end of the central hole (151); The first valve core (2) has a first end that is slidably inserted into the central hole (151), and a second end that extends out of the central hole (151) and has an annular seal (22). The first valve core (2) has a central through hole (211) through it along the axial direction. The second valve core (3) is inserted through the central through hole (211) and spaced apart from the hole wall of the central through hole (211). The first end of the second valve core (3) is slidably inserted into the fixed seat (4). The second end of the second valve core (3) extends out of the central through hole (211) and has a sealing cap (32). The sealing cap (32) is spaced apart from the annular seal (22). The first elastic element (8) is used to apply an elastic force to the first valve core (2) to make the first valve core (2) move along a first axial direction, the first axial direction being opposite to the direction of the electromagnetic force acting on the first valve core (2) when the electromagnetic mechanism (1) is energized; The second elastic element (9) is used to apply an elastic force to the second valve core (3) to make the second valve core (3) move along the first axial direction.

2. The solenoid valve according to claim 1, characterized in that, The minimum distance between the second valve core (3) and the hole wall of the central through hole (211) is d, 0.7mm≤d≤20mm.

3. The electromagnetic valve according to claim 1, characterized by In the axial direction of the first valve core (2), the sealing cap (32) extends out of the outside of the first valve core (2), and the sealing cap (32) is spaced apart from the annular seal (22).

4. The electromagnetic valve according to claim 1, characterized by The first valve core (2) includes a first moving shaft (21), the first end of the first moving shaft (21) is coaxial and slidably inserted into the central hole (151), the first moving shaft (21) has a through central hole, the annular seal (22) is sleeved on the second end of the first moving shaft (21), and the two ends of the first elastic member (8) abut against the ends of the annular seal (22) and the electromagnetic mechanism (1), respectively.

5. The solenoid valve according to claim 4, characterized in that, The first moving shaft (21) has a side through hole (212) that connects to the central through hole (211) on its side wall.

6. The solenoid valve according to claim 5, characterized in that, The central perforation (211) is flared at one end toward the sealing cap (32) to form a flared portion; And / or, the inner diameter of the annular seal (22) is larger than the outer diameter of the sealing cap (32).

7. The solenoid valve according to claim 6, characterized in that, The first movable shaft (21) includes a first shaft portion (213) and a second shaft portion (214) coaxially connected. The end of the first shaft portion (213) away from the second shaft portion (214) is slidably inserted into the central hole (151). The outer diameter of the second shaft portion (214) is larger than the outer diameter of the first shaft portion (213). The annular seal (22) is sleeved on the outside of the second shaft portion (214). The flared portion extends from the first shaft portion (213) to the end face of the second shaft portion (214).

8. The electromagnetic valve according to claim 7, characterized by The side through hole (212) is formed in the first shaft portion (213); And / or, the flared portion includes a first flared portion (2112) and a second flared portion (2113), the second flared portion (2113) being coaxially connected to the side of the first flared portion (2112) away from the fixed seat (4), the diameters of the first flared portion (2112) and the second flared portion (2113) gradually increasing in the direction toward the annular seal (22), and the cone angle of the first flared portion (2112) being smaller than the cone angle of the second flared portion (2113), and the first flared portion (2112) extending from the first shaft portion (213) to the second shaft portion (214), the second flared portion (2113) penetrating the end face of the second shaft portion (214).

9. The electromagnetic valve according to any one of claims 1 to 8, characterized by The fixed seat (4) is provided with a guide groove (41), and the second valve core (3) is provided with a receiving groove (311) at one end away from the sealing cap (32). The first end of the second elastic member (9) abuts against the bottom of the guide groove (41) and the second end abuts against the bottom of the receiving groove (311). Alternatively, the second elastic member (9) is sleeved on the outside of the second valve core (3) and at least partially located in the central through hole (211), and the first end of the second elastic member (9) abuts against the end of the fixed seat (4), the second end of the second elastic member (9) abuts against the sealing cap (32), and the second elastic member (9) is spaced apart from the hole wall of the central through hole (211).

10. The electromagnetic valve according to any one of claims 1 to 8, characterized by The end of the fixed seat (4) is provided with a first buffer pad (5), which is used to abut against the first end of the first valve core (2); And / or, a guide groove (41) is provided on the fixed seat (4), one end of the second valve core (3) is slidably inserted into the guide groove (41), and a second buffer pad (6) is provided at the bottom of the guide groove (41), the second buffer pad (6) is used to abut against the first end of the second valve core (3).

11. The solenoid valve according to any one of claims 1-8, characterized in that, The first elastic element (8) is used to apply an elastic force to the first valve core (2) to move the first valve core (2) in a direction away from the electromagnetic mechanism (1); the second elastic element (9) is used to apply an elastic force to the second valve core (3) to move the second valve core (3) in a direction away from the electromagnetic mechanism (1).

12. A gas distribution apparatus, characterized by, The device includes a gas distribution seat (200) and a solenoid valve as described in any one of claims 1-11. The gas distribution seat (200) has a communicating air inlet channel (201) and a mounting valve chamber (204). The gas distribution seat (200) also has a first gas distribution channel (202), a second gas distribution channel (203), a first valve port (2051) communicating with the first gas distribution channel (202) and the mounting valve chamber (204), and a second valve port (207) communicating with the second gas distribution channel (203) and the mounting valve chamber (204). The electromagnetic mechanism (1) is sealed and installed on the gas distribution seat (200), and the annular seal (22) and the sealing cap (32) are both located in the installation valve cavity (204). The annular seal (22) can block or open the first valve port (2051), and the sealing cap (32) can block or open the second valve port (207).

13. The gas distribution device of claim 12, wherein, The bottom of the mounting valve chamber (204) is provided with the second valve port (207), and the bottom of the mounting valve chamber (204) is provided with a boss (205) surrounding the second valve port (207). The boss (205) is provided with the first valve port (2051) on one end face facing the electromagnetic mechanism (1). The annular seal (22) can abut against the end of the boss (205) to block the first valve port (2051). The sealing cap (32) extends into the inside of the boss (205) and is spaced apart from the inner wall of the boss (205). The side wall of the boss (205) is provided with a vent hole (2054) that communicates with the mounting valve chamber (204).

14. A gas water heating apparatus characterised by, Includes the gas distribution device as described in claim 12 or 13.

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