Gas proportional valve and gas equipment

Abstract

The invention belongs to the technical field of valves, and particularly discloses a gas proportional valve and gas equipment. The gas proportional valve comprises a valve seat assembly, a valve element assembly, a valve rod assembly, an electromagnetic assembly and an elastic piece. The valve rod assembly and the valve element assembly are coaxially installed in the valve installation cavity, the valve rod assembly comprises a connecting rod and a main diaphragm, the main diaphragm divides the valve installation cavity into a first cavity and a second cavity, the end face of the first end of the connecting rod is a spherical face, and the sphere center corresponding to the spherical face is located on the axis of the valve element assembly and located on the connecting plane of the connecting rod and the main diaphragm. The spherical surface can abut against the second end of the valve element assembly. The electromagnetic assembly drives the valve rod assembly to move in the direction towards the valve element assembly so as to push the valve rod assembly to open the valve port. According to the fuel gas proportional valve and the fuel gas equipment, the influence of vibration of the valve rod assembly on the valve element assembly can be reduced, the pressure stabilizing effect of the fuel gas proportional valve is improved, and the operation noise of the fuel gas proportional valve and the fuel gas equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a gas proportional valve and gas equipment. Background Technology

[0002] The gas proportional valve is a core component of a gas water heater. Its functions include stabilizing the gas output pressure and regulating the gas flow rate according to the magnitude of the control current. A gas proportional valve typically consists of an electromagnetic mechanism and a valve core assembly. The valve core assembly includes a valve stem, a valve core mounted at the first end of the valve stem, and a magnet mounted at the second end of the valve stem. The valve stem is mounted on a valve seat via a diaphragm, and the electromagnetic mechanism is located on the side of the valve stem furthest from the valve core. When the electromagnetic mechanism is energized, the generated magnetic field acts on the magnet, causing the magnet to move axially along the valve stem. This movement, in turn, moves the valve core assembly to adjust the opening between the valve core and the valve port, thereby regulating the flow rate and gas output pressure.

[0003] During the use of gas proportional valves, the valve stem and valve core may wobble radially and become misaligned due to factors such as gas turbulence impact, diaphragm assembly stress, or assembly errors. This can lead to noise and unstable outlet pressure during operation. Additionally, the weight of the magnet on the valve stem can further affect the radial wobble of the valve stem.

[0004] To address this issue, existing technologies typically incorporate a guide structure on the valve seat to restrict the valve stem's movement to its axial direction only. However, when the valve stem tends to oscillate radially, the guide structure, through its physical contact with the valve stem's sidewall, restricts the stem. As the valve stem moves axially, axial friction exists between the stem and the guide structure, hindering its axial movement, reducing the smoothness of its axial operation, and easily causing stem wear, thus affecting the gas proportional valve's service life. Furthermore, the greater the radial oscillation tendency of the valve stem, the greater the friction between the stem and the guide structure, and the greater the resistance to the stem's axial movement. This negatively impacts the pressure regulation and stabilization performance of the gas proportional valve, leading to adverse phenomena such as increased hysteresis or sudden pressure changes at the outlet pressure. Summary of the Invention

[0005] One of the technical problems solved by this invention is to provide a gas proportional valve that can effectively solve the problem of increased axial friction during valve stem operation caused by the use of a guide structure to prevent valve stem overturning, which leads to wear and poor pressure stabilization. While achieving the valve stem overturning effect, it improves the smoothness of valve stem operation and ensures the pressure stabilization effect of the gas proportional valve.

[0006] The second technical problem solved by this invention is to provide a gas equipment that can effectively solve the problem of poor operational stability caused by the difficulty in balancing the pressure regulation and stabilization effect and the anti-overturning effect of the gas proportional valve in existing gas equipment, thereby improving the operational stability of the gas equipment.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A gas proportional valve, comprising:

[0009] The valve seat assembly has an air inlet channel, a valve mounting cavity, and an air outlet channel connected in sequence. A valve port is provided in the valve mounting cavity, and a guide component with a guide hole is provided in the valve mounting cavity.

[0010] A valve core assembly is installed in the valve mounting cavity and includes a valve shaft and a valve core component connected to a first end of the valve shaft. The valve shaft is slidably disposed in the guide hole along its axial direction so that the valve core component can adjust the opening degree of the valve port.

[0011] A valve stem assembly is coaxially mounted in the valve mounting cavity with the valve core assembly. The valve stem assembly includes a connecting rod and a main diaphragm sleeved on the connecting rod. The main diaphragm divides the valve mounting cavity into a first cavity and a second cavity. The valve port and the valve core assembly are both disposed in the first cavity. The first end face of the connecting rod is a spherical surface. The center of the spherical surface is located on the axis of the valve core assembly, and the center of the spherical surface is located on the connecting plane between the main diaphragm and the connecting rod. The connecting plane is perpendicular to the connecting rod. The spherical surface can abut against the second end of the valve shaft.

[0012] An electromagnetic component is used to drive the valve stem assembly to move in a direction toward the valve core assembly, so as to push the valve stem assembly to open the valve port;

[0013] An elastic element is used to apply an elastic force to the valve core assembly, causing the valve core assembly to move toward the valve stem assembly.

[0014] The gas proportional valve of the present invention has the following advantages compared with the prior art: Because the first end of the connecting rod is provided with a spherical surface, when the gas proportional valve is in the open state, the spherical surface contacts the second end point of the valve core assembly; since the center of the spherical surface is located on the axis of the valve core assembly, and simultaneously on the connecting plane between the main diaphragm and the connecting rod, when the connecting rod is subjected to external impact or other reasons and swings, the connecting rod swings approximately around the center of the spherical surface as its fixed swing point. Because the spherical surface contacts the second end point of the valve core assembly, the spherical surface and the second end of the valve core assembly always maintain a point contact position during the swing, and the contact position does not change in the first direction. Therefore, the swing of the connecting rod will not cause the valve core assembly to move, thereby preventing changes in the valve opening caused by the swing of the connecting rod, and thus preventing... This design effectively addresses the issue of fluctuating pressure or sudden changes in outlet pressure, ensuring the pressure stabilization effect of the gas proportional valve. Compared to solutions where the diaphragm is directly mounted on the valve core assembly and anti-sway settings are achieved solely through a guide interface, the connecting rod and valve shaft are not connected. This ensures that the swaying of the connecting rod does not affect the movement of the valve core assembly. The valve core assembly moves only along the axial direction of the guide hole, and there is minimal friction between the valve shaft and the guide hole wall. Furthermore, the friction between the guide hole wall and the valve shaft is unaffected by the swaying amplitude of the connecting rod, effectively preventing valve shaft wear and valve core displacement due to connecting rod swaying. Moreover, the small point contact area between the connecting rod and the valve core assembly results in less friction and consequently less wear, ensuring smooth operation of the valve core assembly during long-term use and improving the long-term reliability of the gas proportional valve.

[0015] In one embodiment, the main diaphragm includes an annular plate portion and a main deformation portion coaxially connected from the inside to the outside. The annular plate portion is sleeved on the connecting rod and is perpendicular to the axial direction of the valve shaft. The main deformation portion is an arc-shaped annular structure with its opening facing the valve port. The central plane of the annular plate portion is the connecting plane.

[0016] In one embodiment, the connecting rod includes a main rod body, the main diaphragm is sleeved on the main rod body, a first end of the main rod body is connected to a pushing part, the outer diameter of the pushing part is larger than the outer diameter of the main rod body, and the end face of the pushing part away from the main rod body forms the spherical surface;

[0017] And / or, in a projection plane perpendicular to the valve shaft axis, the orthogonal projection area of ​​the spherical surface in the projection plane is greater than the area of ​​the second end face of the valve shaft.

[0018] In one embodiment, when the electromagnetic component is de-energized, the valve core blocks the valve port, and there is a preset gap between the spherical surface and the second end of the valve shaft.

[0019] In one embodiment, the preset gap is 0.5mm to 2mm.

[0020] In one embodiment, the valve stem assembly further includes an auxiliary diaphragm, which is sleeved on the connecting rod and spaced apart from the main diaphragm. The auxiliary diaphragm divides the first cavity into a pressure-stabilizing cavity and a flow cavity. The valve port and the valve core assembly are disposed in the flow cavity. The pressure-stabilizing cavity is located between the main diaphragm and the auxiliary diaphragm. The diaphragm force-bearing area of ​​the auxiliary diaphragm is smaller than that of the main diaphragm.

[0021] The valve seat assembly has a pressure-feeding channel, the first end of which is connected to the air intake channel, and the second end of which is connected to the pressure-stabilizing chamber.

[0022] In one embodiment, the valve stem assembly further includes a support member sleeved on the connecting rod, a first end of the connecting rod having a radially protruding limiting structure, a second end of the connecting rod having a magnet assembly mounted thereon, an auxiliary diaphragm sandwiched between the support member and the limiting structure, and a main diaphragm sandwiched between the support member and the magnet assembly.

[0023] In one embodiment, the valve seat assembly includes a main seat body, a diaphragm seat, and a valve cover that are detachably connected sequentially along the axial direction of the valve shaft. The main seat body has the air inlet channel, the flow chamber, and the air outlet channel. The peripheral sealing of the auxiliary diaphragm is clamped between the first end of the main seat body and the diaphragm seat, and the peripheral sealing of the main diaphragm is clamped between the second end of the valve cover and the diaphragm seat. The electromagnetic assembly is mounted on the valve cover.

[0024] In one embodiment, a valve core seat is detachably installed in the valve mounting cavity. The valve core seat has an airflow channel that extends axially along the valve shaft. The end of the airflow channel away from the connecting rod forms the valve port. The guide component is disposed in the airflow channel.

[0025] In one embodiment, the valve core seat includes an outer seat portion spaced outside the guide member and a connecting portion connecting the outer seat portion and the guide member, wherein the outer seat portion is sealed to the cavity wall of the valve mounting cavity;

[0026] The outer wall of the valve shaft is provided with a pressing protrusion. The elastic element is sleeved on the outside of the guide component, and one end of the elastic element abuts against the connecting part, while the other end of the elastic element abuts against the pressing protrusion.

[0027] In one embodiment, the valve seat assembly includes an inlet seat and an outlet seat that are axially separated and detachably connected along the valve shaft. The outlet seat is provided with the outlet channel, and the inlet seat is provided with the inlet channel. The inlet seat and the outlet seat share at least a portion of the valve mounting cavity, and the valve core seat is sandwiched between the inlet seat and the outlet seat.

[0028] The second technical problem mentioned above is solved by the following technical solution:

[0029] A gas appliance includes a gas proportional valve as described above.

[0030] Compared with the prior art, the gas equipment described in this invention has the following advantages: by adopting the above-mentioned gas proportional valve, the gas supply stability and reliability of the gas equipment can be improved, the noise during operation of the gas equipment can be reduced, and the user experience of the gas equipment can be improved. Attached Figure Description

[0031] Figure 1 This is a schematic diagram showing the disassembled structure of a gas proportional valve according to an embodiment of the present invention;

[0032] Figure 2 This is a structural cross-sectional view of a gas proportional valve in the closed state according to an embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional view of the gas proportional valve in the open state according to an embodiment of the present invention;

[0034] Figure 4 for Figure 3 A magnified view of a section at point I;

[0035] Figure 5 This is a schematic diagram of the assembly structure of the connecting rod and the main diaphragm according to an embodiment of the present invention;

[0036] Figure 6 This is a structural cross-sectional view of a valve stem assembly provided in an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the disassembled structure of a valve stem assembly provided in an embodiment of the present invention;

[0038] Figure 8 This is a partial structural schematic diagram of a gas proportional valve provided in an embodiment of the present invention;

[0039] Figure 9 for Figure 8 A schematic diagram of the split structure of the middle part;

[0040] Figure 10 A cross-sectional view of a gas proportional valve in the open state, provided in another embodiment of the present invention.

[0041] Label Explanation:

[0042] 1. Valve stem assembly; 11. Connecting rod; 111. Main rod body; 112. Pushing part; 1121. Spherical surface; 1122. Annular groove; 113. Pressing protrusion; 12. Main diaphragm; 121. Ring part; 122. Ring plate part; 123. Main deformation part; 124. Main sealing ring part; 13. Auxiliary diaphragm; 131. Inner ring part; 132. Boss part; 133. Auxiliary deformation part; 134. Auxiliary sealing ring part; 14. Magnet assembly; 141. Magnet; 142. Mounting base; 143. Gland; 15. Support; 151. Support plate; 1511. Flat support part; 1512. Arc-shaped support part; 1513. Positioning ring part; 152. Support sleeve; 1521. Positioning groove; 16. Pressing part;

[0043] 2. Valve core assembly; 21. Valve shaft; 211. Main shaft body; 212. Pressing protrusion; 213. Mounting part; 22. Valve core component;

[0044] 3. Valve seat assembly; 31. Outlet seat; 311. Outlet passage; 32. Inlet seat; 321. Inlet passage; 33. Diaphragm seat; 34. Valve cover; 341. Limiting protrusion; 342. Positioning protrusion; 35. Valve core seat; 351. Outer seat; 3511. Airflow passage; 352. Guide component; 3521. Guide hole; 353. Connecting part; 354. Valve port; 36. Valve mounting cavity; 361. First cavity; 3611. Flow cavity; 3612. Pressure stabilizing cavity; 362. Second cavity; 37. Pressure tapping passage; 38. First sealing ring; 39. Second sealing ring; 310. Third sealing ring;

[0045] 4. Electromagnetic components; 5. Elastic components; A. Swinging fixed point. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] This embodiment provides a gas proportional valve, which can be applied to gas equipment to regulate the flow rate and gas supply pressure of the gas equipment, thereby improving the reliability of the gas equipment.

[0051] like Figures 1 to 3As shown, specifically, the gas proportional valve includes a valve seat assembly 3, an electromagnetic assembly 4, a valve stem assembly 1, and a valve core assembly 2. The valve seat assembly 3 has an inlet channel 321, a valve mounting cavity 36, and an outlet channel 311 connected sequentially. A valve port 354 is provided within the valve mounting cavity 36, and a guide component 352 with a guide hole 3521 is also provided within the valve mounting cavity 36. The valve core assembly 2 is mounted in the valve mounting cavity 36 and includes a valve shaft 21 and a valve core component 22 connected to the first end of the valve shaft 21. The valve shaft 21 can slide along its axial direction through the guide hole 3521, allowing the valve core component 22 to adjust the opening degree of the valve port 354. The valve stem assembly 1 is coaxially mounted with the valve core assembly 2 in the valve mounting cavity 36. The valve stem assembly 1 includes a connecting rod 11 and a main diaphragm 12 sleeved on the connecting rod 11. The plate 12 divides the valve mounting cavity 36 into a first cavity 361 and a second cavity 362. The valve port 354 and the valve core assembly 2 are both located in the first cavity 361. The first end face of the connecting rod 11 is a spherical surface 1121. The center of the spherical surface 1121 is located at the connecting plane between the main diaphragm 12 and the connecting rod 11. The connecting plane is perpendicular to the connecting rod 11. The spherical surface 1121 can abut against the second end of the valve shaft 21. The electromagnetic component 4 is used to drive the valve stem assembly 1 to move in the direction toward the valve core assembly 2, so as to push the valve stem assembly 1 to open the valve port 354. The elastic element 5 is used to apply an elastic force to the valve core assembly 2 to make the valve core assembly 2 move toward the valve stem assembly 1.

[0052] The gas proportional valve provided in this embodiment allows the electromagnetic component 4 to drive the connecting rod 11 to move toward the valve core assembly 2 when the electromagnetic component 4 is energized, thereby pushing the valve core assembly 2 to move in the first direction, thus opening the valve port 354. When the electromagnetic component 4 is de-energized, the valve core assembly 2 moves toward the valve stem assembly 1 under the restoring force of the elastic element 5, allowing the valve core assembly 2 to reset to the position of closing the valve port 354, and the valve stem assembly 1 to reset to the closed state.

[0053] The gas proportional valve provided in this embodiment has a spherical surface 1121 at the first end of the connecting rod 11. When the gas proportional valve is in the open state, the spherical surface 1121 contacts the second end of the valve core assembly 2. Since the center of the spherical surface 1121 is located on the axis of the valve core assembly 2 and on the connecting plane between the main diaphragm 12 and the connecting rod 11, when the connecting rod 11 is subjected to external impact or other reasons and swings, the connecting rod 11 swings approximately around the center of the spherical surface 1121 as the swing point A. Because the spherical surface 1121 contacts the second end of the valve core assembly 2, the spherical surface 1121 and the second end of the valve core assembly 2 always maintain a point contact position when the connecting rod 11 swings, and the contact position of the two does not change in the first direction. Therefore, the swing of the connecting rod 11 will not cause the valve core assembly 2 to move, thereby avoiding the change in the opening degree of the valve port 354 caused by the swing of the connecting rod 11, thus preventing the differential pressure from increasing or decreasing. The issue of sudden changes in outlet pressure is effectively addressed, ensuring the pressure stabilization effect of the gas proportional valve. Compared to the scheme where the diaphragm is directly mounted on the valve core assembly and the anti-sway setting of the valve core assembly is only achieved through the guide interface, the connecting rod 11 and the valve shaft 21 are not connected. This ensures that when the connecting rod 11 swings, its swing will not affect the movement of the valve core assembly 2. This allows the valve core assembly 2 to move only along the axial direction of the guide hole 3521, while there is no significant friction between the valve shaft 21 and the wall of the guide hole 3521. Furthermore, the friction between the wall of the guide hole 3521 and the valve shaft 21 is not affected by the swing amplitude of the connecting rod 11, effectively preventing wear of the valve shaft 21 and positional displacement of the valve core 2 due to the swing of the connecting rod 11. Moreover, the small point contact area between the connecting rod 11 and the valve core assembly 2 results in less friction and thus less wear, ensuring smooth operation of the valve core assembly 2 during long-term use, reducing noise during operation of the gas proportional valve, and improving the long-term reliability of the gas proportional valve.

[0054] For ease of subsequent description, the axial direction of valve shaft 11 is defined as the first direction.

[0055] like Figure 2 and Figure 3 As shown, to better achieve the cooperation between the valve stem assembly 1 and the electromagnetic assembly 4, a magnet assembly 14 is installed at the second end of the connecting rod 11. The magnet assembly 14 is located within the second cavity 362 and includes a magnet 141. The electromagnetic assembly 4 and the magnet assembly 14 are arranged facing each other in the first direction. When the electromagnetic assembly 4 is energized, the magnetic field generated by the electromagnetic assembly 4 acts on the magnet 141, causing the magnet 141 to move away from the electromagnetic assembly 4, thereby driving the connecting rod 11 to move towards the valve core assembly 2. When the electromagnetic assembly 4 is de-energized, the magnet 141 returns to its original position under the magnetic attraction of the iron core inside the electromagnetic assembly 4, moving towards the electromagnetic assembly 4.

[0056] In one embodiment, the electromagnetic component 4 is mounted on the outside of the valve seat assembly 3, thereby reducing the assembly difficulty of the electromagnetic component 4 on the valve seat assembly 3, simplifying the structure of the electromagnetic component 4, and improving the ease of disassembly and assembly of the electromagnetic component 4 relative to the valve seat assembly 3. The specific structure of the electromagnetic component 4 can be set with reference to the prior art, which is not the focus of this invention and will not be described in detail here.

[0057] Furthermore, a limiting protrusion 341 is provided at the bottom of the second cavity 362 away from the first cavity 361. The limiting protrusion 341 can abut against the electromagnetic component 4 to limit the stroke of the valve stem assembly 1 away from the valve port 354 and reduce the impact between the valve seat assembly 3 and the valve stem assembly 1. In one embodiment, the limiting protrusion 341 is preferably annular and coaxially arranged with the connecting rod 11. In other embodiments, the limiting protrusion 341 may also be a protrusion structure, and multiple limiting protrusions 341 are spaced apart along the circumference of the connecting rod 11.

[0058] To ensure that the valve core assembly 2 can return to the closed valve port 354 position after the electromagnetic component 4 is disconnected, when the electromagnetic component 4 is de-energized, there is a preset gap between the spherical surface 1121 and the second end face of the valve core assembly 2. This causes the valve core assembly 2 and the valve stem assembly 1 to separate in the first direction during the reset process, thereby preventing the valve stem assembly 1 from applying a pushing force to the valve core assembly 2 in the direction toward the valve port 354. This ensures that the valve core assembly 2 can reliably return to the closed valve port 354 position under the elastic force of the elastic element 5, thus ensuring the reliability and safety of the gas proportional valve.

[0059] In one embodiment, the preset gap is 0.5mm to 2mm to avoid the problem that the second end of the valve shaft 21 will contact the spherical surface 1121 when the gas proportional valve is in the closed state due to assembly error or processing error if the preset gap is too small. At the same time, it avoids the problem that the overall size of the gas proportional valve in the first direction will increase and the stroke required for the valve stem assembly 1 to move to push the valve core assembly 2 will increase if the preset gap is too large.

[0060] like Figure 4 and Figure 5 As shown, in the projection plane perpendicular to the first direction, the orthographic projection area of ​​the spherical surface 1121 is larger than the area of ​​the second end face of the valve shaft 21. This better ensures that the connecting rod 11 remains in contact with the second end face of the valve shaft during swinging, thus ensuring that the connecting rod 11 always applies a pushing force to the valve core assembly 2, and avoiding the problem of the valve core assembly 2 resetting under the action of elastic force due to the separation of the connecting rod 11 and the valve core assembly 2.

[0061] In one embodiment, the connecting rod 11 includes a main rod body 111, a main diaphragm 12 sleeved on the main rod body 111, and a pusher portion 112 connected to the first end of the main rod body 111. The outer diameter of the pusher portion 112 is larger than the outer diameter of the main rod body 111, and the end face of the pusher portion 112 away from the main rod body 111 forms a spherical surface 1121. This increases the area of ​​the spherical surface 1121 while keeping the diameter of the main rod body 111 unchanged, thereby increasing the contact area between the connecting rod 11 and the valve shaft 21. This reduces the overall weight and footprint of the valve stem assembly 1, effectively preventing the valve shaft 21 and the connecting rod 11 from detaching due to oscillation during contact, improving the contact stability and reliability of the valve stem assembly 1 with the valve core assembly 2, and thus improving the operational reliability of the gas proportional valve.

[0062] The main diaphragm 12 includes an annular plate portion 122, a main deformation portion 123, and a main sealing ring portion 124 coaxially connected from the inside to the outside. The annular plate portion 122 is interference-fitted onto the connecting rod 11 and is perpendicular to the connecting rod 11. The main deformation portion 123 is an arc-shaped annular structure with its opening facing the valve port 354. The main sealing ring portion 124 is sealed to the valve seat assembly 3, thereby facilitating the deformation of the main diaphragm 12 when the pressure difference on both sides changes.

[0063] The central plane of the ring plate portion 122 is the connecting plane, that is, the center of the spherical surface 1121 forms the swing fixed point A. The center of the spherical surface 1121 is located in the plane of the ring plate portion 122, so that when the connecting rod 11 is subjected to impact and deflection, it can swing around the swing fixed point A. Since the swing fixed point A is located in the plane of the ring plate portion 122, the impact of the swing of the connecting rod 11 on the main diaphragm 12 can be reduced. Thus, even if the connecting rod 11 swings, the main diaphragm 12 will not deform much, thereby ensuring the stability of the main diaphragm 12. At the same time, this arrangement allows the main diaphragm 12 to better apply a force to limit the swing of the connecting rod 11 when it swings, reducing the swing amplitude of the connecting rod 11 and improving the operational stability and reliability of the valve stem assembly 1.

[0064] To improve the connection stability between the main diaphragm 12 and the connecting rod 11, a collar portion 121 protrudes from one side of the annular plate portion 122. The inner diameter of the collar portion 121 is equal to the inner diameter of the annular plate portion 122, and the collar portion 121 is interference-fitted onto the connecting rod 11. This reduces the overall thickness of the main diaphragm 12 while increasing the contact area between the main diaphragm 12 and the connecting rod 11, thereby improving the connection stability and reliability between the main diaphragm 12 and the connecting rod 11.

[0065] like Figure 2 and Figure 3As shown, in one embodiment, the valve stem assembly 1 further includes an auxiliary diaphragm 13, which is sleeved on the connecting rod 11 and spaced apart from the main diaphragm 12. The auxiliary diaphragm 13 divides the first cavity 361 into a pressure stabilizing cavity 3612 and a flow cavity 3611. The valve port 354 and the valve core assembly 2 are disposed in the flow cavity 3611. The pressure stabilizing cavity 3612 is located between the main diaphragm 12 and the auxiliary diaphragm 13. The diaphragm force-bearing area of ​​the auxiliary diaphragm 13 is smaller than that of the main diaphragm 12. The valve seat assembly 3 has a pressure-guiding channel 37. The first end of the pressure-guiding channel 37 is connected to the air intake channel 321, and the second end of the pressure-guiding channel 37 is connected to the pressure stabilizing cavity 3612.

[0066] By setting an auxiliary diaphragm 13, the oscillation energy of the connecting rod 11 is absorbed by the auxiliary diaphragm 13, thereby reducing the oscillation amplitude of the connecting rod 11 and further improving the operational reliability and stability of the valve stem assembly 1. At the same time, in conjunction with the pressure-tapping channel 37, the gas portion entering the intake channel 321 will enter the pressure-stabilizing chamber 3612 through the pressure-tapping channel 37, making the gas pressure in the pressure-stabilizing chamber 3612 the same as the intake pressure in the intake channel 321. Therefore, when the intake pressure in the intake channel 321 changes, the gas pressure in the pressure-stabilizing chamber 3612 changes, causing the main diaphragm 12 to... The auxiliary diaphragm 13 deforms, causing the connecting rod 11 to move in the first direction, thereby actuating the valve core assembly 2 to move in the first direction to adjust the opening of the valve port 354, so that the opening of the valve port 354 matches the intake pressure, improving the pressure stabilization effect. Moreover, since the pressure in the pressure stabilizing chamber 3612 is the same as the pressure in the intake channel 321, the opening of the valve port 354 can be adjusted as soon as the intake pressure changes, so that the adjustment timing of the valve port 354 opening is basically consistent with the change of intake pressure, improving the pressure stabilization efficiency and pressure regulation sensitivity, and enhancing the performance of the gas proportional valve.

[0067] Specifically, when the intake pressure increases, the pressure in the pressure stabilizing chamber 3612 increases, making the pressure in the pressure stabilizing chamber 3612 greater than the pressure in the flow chamber 3611. This causes the auxiliary diaphragm 13 to deform in the direction toward the valve port 354 under the influence of the pressure difference on both sides, while the main diaphragm 12 deforms in the direction away from the valve port 354 under the influence of the pressure difference on both sides. Since the force-bearing area of ​​the auxiliary diaphragm 13 is smaller than that of the main diaphragm 12, the deformation of the main diaphragm 12 is greater than that of the auxiliary diaphragm 13. This causes the connecting rod 11 to move away from the valve port 354 as a whole, which in turn causes the valve core assembly 2 to move in the direction toward the connecting rod 11 under the influence of elastic force. The opening of the valve port 354 decreases, thereby reducing the gas flow area and increasing the pressure loss. This allows the outlet pressure of the gas outlet channel 311 to remain constant, achieving the pressure stabilizing function.

[0068] It is worth noting that in other embodiments, such as Figure 10As shown, the auxiliary diaphragm 13 and pressure channel 37 can be omitted. In this case, when the intake pressure increases, the overall pressure of the valve mounting cavity 36 increases, which causes the main diaphragm 12 to deform away from the valve port 354 under the action of the pressure difference on both sides. This causes the connecting rod 11 to move away from the valve port 354, which in turn causes the valve core assembly 2 to move towards the connecting rod 11 under the action of the elastic element 5, thereby reducing the opening of the valve port 354.

[0069] In one embodiment, the auxiliary diaphragm 13 includes an inner ring portion 131, an auxiliary deformation portion 133, and an auxiliary sealing ring portion 134 connected sequentially from the inside to the outside. The auxiliary deformation portion 133 is an arc-shaped ring structure with its opening facing the main diaphragm 12, and the inner ring portion 131 is interference-fitted onto the main rod body 111.

[0070] It is worth noting that the diaphragm force-bearing area of ​​the main diaphragm 12 refers to the area of ​​the circle corresponding to the maximum protrusion position of the main deformation part 123 of the main diaphragm 12, and the diaphragm force-bearing area of ​​the auxiliary diaphragm 13 refers to the area of ​​the circle corresponding to the maximum protrusion position of the auxiliary deformation part 133 of the auxiliary diaphragm 13.

[0071] like Figure 6 and Figure 7 As shown, to improve the stability and reliability of the main diaphragm 12, the valve stem assembly 1 also includes a support member 15. The support member 15 and the magnet assembly 14 are located on opposite sides of the main diaphragm 12, and the main diaphragm 12 is sandwiched between the support member 15 and the magnet assembly 14. This ensures the positional accuracy of the main diaphragm 12 and the connecting rod 11 in the first direction, and at the same time ensures that the ring plate portion 122 can maintain a planar state under the clamping action of the support member 15 and the magnet assembly 14, thereby limiting the deformation of the ring plate portion 122 during the valve stem assembly 1 process.

[0072] Furthermore, to ensure the reliability of the installation position of the auxiliary diaphragm 13 on the connecting rod 11, the first end of the connecting rod 11 has a radially protruding limiting structure. The auxiliary diaphragm 13 is sandwiched between the support member 15 and the limiting structure, thereby ensuring the relative positional accuracy of the main diaphragm 12, the support member 15, and the auxiliary diaphragm 13 in the first direction. Specifically, the portion of the pushing part 112 that protrudes radially from the main rod body 111 forms the limiting structure, and the inner ring part 131 is sandwiched between the pushing part 112 and the support sleeve 152.

[0073] Furthermore, the pushing part 112 has an annular groove 1122 surrounding the main rod 111, and the inner ring part 131 has a boss part 132 protruding from the support sleeve 152. The boss part 132 is inserted into the annular groove 1122 to increase the contact area between the auxiliary diaphragm 13 and the main rod 111 while reducing the distance between the support sleeve 152 and the limiting part. Furthermore, the bottom of the annular groove 1122 has a pressing protrusion 113 that abuts against the end face of the boss part 132 to ensure the tightness between the boss part 132 and the pushing part 112, and to better achieve the connection and sealing performance between the auxiliary diaphragm 13 and the connecting rod 11. The pressing protrusion 113 is preferably an annular structure coaxial with the main rod 111.

[0074] To improve the ease of installation of the magnet 141, the magnet assembly 14 further includes a mounting base 142, which is sleeved on the second end of the connecting rod 11. The magnet 141 is mounted on the mounting base 142, and the annular plate portion 122 is sandwiched between the mounting base 142 and the support member 15. In one embodiment, a limiting groove is formed on the mounting base 142, the limiting groove surrounds the connecting rod 11, and the annular portion 121 is disposed in the limiting groove. In other embodiments, the limiting groove may be formed on the support member 15.

[0075] To improve the ease of assembly and disassembly of the magnet 141, a mounting groove is provided on the mounting base 142, in which the magnet 141 is accommodated. The magnet assembly 14 also includes a pressure cap 143, which covers the opening of the mounting groove and is detachably connected to the mounting base 142 to prevent the magnet 141 from falling out of the mounting groove, thereby improving the stability and reliability of the magnet 141. The mounting base 142 and the pressure cap 143 are preferably snap-fitted together to improve ease of assembly and disassembly and simplify the structure. In other embodiments, the mounting base 142 and the pressure cap 143 may also be connected by screws. Furthermore, the pressure cap 143 abuts against the limiting protrusion 341 to accommodate the movement stroke of the magnet assembly 14.

[0076] In one embodiment, the mounting base 142 has a clearance groove communicating with the mounting slot. The groove wall of the clearance groove has a mounting hole, and the second end of the connecting rod 11 passes through the mounting hole and extends into the clearance groove. To prevent the mounting base 142 from disengaging from the connecting rod 11 in the first direction, a retaining member 16 is detachably provided at the second end of the connecting rod 11. The end of the mounting base 142 away from the magnet 141 is clamped between the retaining member 16 and the main diaphragm 12. The retaining member 16 can be, but is not limited to, a retaining ring sleeved on the connecting rod 11, a pin radially inserted into the connecting rod 11, or a locking nut threaded onto the outside of the connecting rod 11.

[0077] To better ensure the deformation performance of the main diaphragm 12, the support member 15 has an arc-shaped support portion 1512. The arc-shaped opening direction of the arc-shaped support portion 1512 is the same as the opening direction of the main deformation portion 123, and the radial width of the arc-shaped support portion 1512 is smaller than the radial width of the main deformation portion 123. The arc-shaped support portion 1512 extends into the concave area of ​​the main deformation portion 123, and the side of the main deformation portion 123 facing the annular plate portion 122 abuts against the arc-shaped support portion 1512. The maximum concavity of the main deformation portion 123 and the side of the main deformation portion 123 away from the annular plate portion 122 are separated from the arc-shaped support portion 1512. The arc-shaped support 1512 can support the main deformation part 123 when the gas proportional valve is closed, so that the main deformation part 123 can be kept in the closed state, reducing the probability of the main deformation part 123 collapsing, thereby ensuring the deformation accuracy of the main deformation part 123 after being deformed under pressure.

[0078] In one embodiment, the support member 15 includes a support sleeve 152 and a support plate 151. Both the support plate 151 and the support sleeve 152 are sleeved on the connecting rod 11, and the support plate 151 is sandwiched between the support sleeve 152 and the main diaphragm 12. The support plate 151 is provided with the aforementioned arc-shaped support portion 1512, and the outer diameter of the support plate 151 is larger than the outer diameter of the support sleeve 152. This arrangement helps to increase the stability and reliability of the support member 15 on the connecting rod 11, while improving the ease of installation of the arc-shaped support portion 1512 and reducing the processing difficulty of the support plate 151.

[0079] To improve the stability of the support sleeve 152 on the connector, the connecting rod 11 includes a main rod body 111, on which the support member 15, the main module, and the mounting base 142 are all sleeved. The second end of the main rod body 111 protrudes radially outward with a limiting portion. The support sleeve 152 is sandwiched between the limiting portion and the support plate 151, thereby restricting the movement of the support sleeve 152 away from the support plate 151 by the limiting portion, ensuring the accuracy of the relative position of the support member 15 and the connecting rod 11 in the first direction. In other embodiments, the support sleeve 152 can also be threaded onto the connecting rod 11 or fixed to the connecting rod 11 by fastening screws.

[0080] In one embodiment, the support plate 151 includes a flat plate support portion 1511, which is connected to the inner side of the arc-shaped support portion 1512. The opposite sides of the flat plate support portion 1511 abut against the end faces of the ring plate portion 122 and the support sleeve 152, respectively. The ring plate portion 122 is sandwiched between the end faces of the flat plate support portion 1511 and the mounting base 142, so that the flat plate support portion 1511 can fit around the ring plate portion 122, thereby keeping the ring plate portion 122 in a flat state and improving the stability of the main diaphragm 12.

[0081] The inner ring of the flat plate support 1511 extends towards the support sleeve 152 and has a positioning ring 1513. The end face of the support sleeve 152 has a positioning groove 1521, and the positioning ring 1513 is inserted into the positioning groove 1521 to achieve the installation and positioning of the support sleeve 152 and the support member 15. Furthermore, the inner diameter of the positioning ring 1513 is larger than the diameter of the main rod 111 to reduce the assembly difficulty.

[0082] The pressure-tapping channel 37 is located on the outer side of the auxiliary diaphragm 13 to avoid the problem of reduced pressure stabilization caused by opening holes in the auxiliary diaphragm 13. In one embodiment, the pressure-tapping channel 37 extends along a first direction to reduce the processing difficulty of the pressure-tapping channel 37 and simplify the structure of the valve seat assembly 3. The diameter of the pressure-tapping channel 37 is preferably 0.5 mm to 5 mm.

[0083] like Figure 2 and Figure 3 As shown, in one embodiment, to improve the ease of installation of the valve stem assembly 1, the valve seat assembly 3 includes a main seat body, a diaphragm seat 33, and a valve cover 34 that are detachably connected in sequence along a first direction. The main seat body has the aforementioned air inlet channel 321, flow cavity 3611, and air outlet channel 311. The first end of the flow cavity 3611 is provided with a valve port 354, and the second end of the flow cavity 3611 penetrates the end face of the main seat body to form an installation port. The diaphragm seat 33 is arranged in a ring and is detachably installed on the end face where the installation port is located. An auxiliary diaphragm 13 is sandwiched between the first end of the diaphragm seat 33 and the main seat body. The valve cover 34 is detachably disposed on the side of the diaphragm seat 33 away from the main seat body, and the main diaphragm 12 is sandwiched between the valve cover 34 and the second end of the diaphragm seat 33. The electromagnetic assembly 4 is installed on the valve cover 34. Therefore, when it is necessary to disassemble or assemble the valve stem assembly 1, the valve cover 34 and the diaphragm seat 33 can be disassembled in sequence, which reduces the processing difficulty of the valve seat assembly 3 and improves the convenience of disassembly, assembly and maintenance of the gas proportional valve.

[0084] Specifically, the main sealing ring 124 of the main diaphragm 12 is sandwiched between the valve cover 34 and the second end of the diaphragm seat 33, and the auxiliary sealing ring 134 of the auxiliary diaphragm 13 is sandwiched between the first end of the diaphragm seat 33 and the main seat body. Further, the valve cover 34 is an open structure with one end open and the other end closed, and the open end of the valve cover 34 mates with the diaphragm seat 33.

[0085] In one embodiment, a first sealing ring 38 is provided between the diaphragm seat 33 and the main seat body. The first sealing ring 38 is located outside the pressure channel 37 to prevent leakage of the pressure stabilizing chamber 3612. Further, the first end of the diaphragm seat 33 is provided with an inner sealing groove and an outer sealing groove. The outer sealing groove surrounds the inner sealing groove. The auxiliary sealing ring portion 134 of the auxiliary diaphragm 13 is accommodated in the inner sealing groove, and the first sealing ring 38 is disposed in the outer sealing groove.

[0086] To improve the fitting accuracy between the valve cover 34 and the diaphragm seat 33, one of the diaphragm seat 33 and the valve cover 34 is provided with a positioning ring groove, and the other is provided with a positioning protrusion 342. The positioning protrusion 342 is inserted into the positioning ring groove to achieve assembly positioning of the two. In one embodiment, the diaphragm seat 33 is provided with a positioning ring groove that penetrates the inner sidewall of the diaphragm seat 33, and the groove wall of the positioning ring groove is provided with a sealing ring groove. The main sealing ring portion 124 is accommodated in the sealing ring groove, and the main sealing ring portion 124 is sandwiched between the bottom of the sealing ring groove and the positioning protrusion 342.

[0087] like Figure 2 , Figure 3 , Figure 8 and Figure 9 As shown, to improve the ease of setting the guide component 352, a valve core seat 35 is detachably installed in the valve mounting cavity 36. The valve core seat 35 has an airflow channel 3511 extending along a first direction. The end of the airflow channel 3511 away from the connecting rod 11 forms a valve port 354, and a guide component 352 is provided in the airflow channel 3511. By setting the valve core seat 35, during the assembly of the gas proportional valve, the valve core assembly 2 can be assembled onto the valve core seat 35 first, and then the valve core seat 35 can be matched with other structures on the valve seat assembly 3, improving assembly efficiency. At the same time, this setting allows for the adaptation of valve core assemblies 2 of different sizes and structures by changing the structure of the valve core seat 35, without changing the structures of the inlet channel 321, valve mounting cavity 36, and outlet channel 311, thereby improving the versatility and flexibility of the gas proportional valve and reducing the improvement cost of the gas proportional valve. Specifically, the valve core seat 35 is detachably installed in the main valve body.

[0088] Specifically, the valve seat assembly 3 includes an inlet seat 32 and an outlet seat 31, which are separately arranged and detachably connected along a first direction. The outlet seat 31 is provided with an outlet channel 311, and the inlet seat 32 is provided with an inlet channel 321. The inlet seat 32 and the outlet seat 31 share at least a portion of the valve mounting cavity 36. The valve core seat 35 is sandwiched between the inlet seat 32 and the outlet seat 31. When it is necessary to disassemble and assemble the valve core assembly 2 and the valve core seat 35 as a whole, the inlet seat 32 can be removed, allowing the valve core seat 35 and the valve core assembly 2 to be exposed, improving the ease of disassembly and assembly of the valve core assembly 2 and the valve core seat 35. At the same time, when the valve core seat 35 is sandwiched between the inlet seat 32 and the outlet seat 31, the valve core seat 35 does not need to be connected to the inlet seat 32 or the outlet seat 31 using a fastening structure, simplifying the structure of the valve seat assembly 3, reducing the number of parts, and further improving the ease of disassembly and assembly.

[0089] Furthermore, the first end of the outlet seat 31 is detachably connected to the inlet seat 32, and the second end of the outlet seat 31 is detachably connected to the diaphragm seat 33. A second sealing ring 39 is provided between the outlet seat 31 and the inlet seat 32 to prevent leakage at the connection between the two. The second sealing ring 39 is arranged around the outer side of the valve core seat 35.

[0090] To improve the ease of assembly and disassembly of the valve core seat 35, in one embodiment, the first end of the outlet seat 31 has a mounting groove. The shape of the mounting groove is adapted to the shape of the valve core seat 35. The valve core seat 35 is inserted into the mounting groove, and the first end face of the valve core seat 35 abuts against the groove wall of the mounting groove. The second end face of the valve core seat 35 abuts against the end face of the inlet seat 32. This clamps the valve core seat 35 between the end face of the inlet seat 32 and the groove wall of the mounting groove, facilitating the installation and positioning of the valve core seat 35. In other embodiments, the mounting groove may be formed on the inlet seat 32, and the valve core seat 35 abuts against the first end face of the outlet seat 31.

[0091] In one embodiment, the valve core seat 35 includes an outer seat portion 351 and a guide member 352 that are coaxially spaced apart. The outer seat portion 351 has a through airflow channel 3511. The guide member 352 is located inside the outer seat portion 351, and the outer side wall of the guide member 352 is connected to the inner side wall of the outer seat portion 351 by a connecting portion 353 to ensure the structural integrity of the valve core seat 35. Preferably, multiple connecting portions 353 are spaced apart along the circumference of the guide member 352 to ensure the connection stability between the guide member 352 and the outer seat portion 351, and a flow channel for airflow is formed between two adjacent connecting portions 353. Further, the valve core member 22 is located on the side of the connecting portion 353 away from the valve stem assembly 1.

[0092] In one embodiment, the outer seat portion 351 has a stepped cross-section, that is, the outer seat portion 351 includes a first seat portion, a second seat portion, and a third seat portion that are coaxial and have gradually increasing outer diameters. The third seat portion is located on the side of the second seat portion away from the valve stem assembly 1. The mounting groove includes a first groove portion, a second groove portion, and a third groove portion with successively increasing groove diameters. The first seat portion mates with the first groove portion, the second seat portion mates with the second groove portion, and the third seat portion mates with the third groove portion, so as to improve the installation stability of the outer seat portion 351 in the mounting groove and reduce the probability of the valve core seat 35 shaking in the mounting groove.

[0093] Furthermore, a third sealing ring 310 is provided between the inner walls of the valve core seat 35 and the outlet seat 31 to achieve a sealing connection between the valve core seat 35 and the outlet seat 31, preventing gas from flowing from the gap between the valve core seat 35 and the outlet seat 31 into the outlet channel 311. Specifically, the axial length of the first seat portion is greater than the axial length of the first groove portion, and the third sealing ring 310 is sandwiched between the circumferential groove wall of the second groove portion and the outer wall of the first seat portion.

[0094] In one embodiment, the outer wall of the valve shaft 21 has a protruding pressing protrusion 212, and the elastic member 5 is sleeved on the outside of the guide member 352. One end of the elastic member 5 abuts against the connecting part 353, and the other end of the elastic member 5 abuts against the pressing protrusion 212. This structural arrangement of the elastic member 5 allows the valve core seat 35, the elastic member 5, and the valve core assembly 2 to be pre-assembled into a component and then installed together into the valve mounting cavity 36, effectively improving the assembly efficiency of the gas proportional valve and enhancing assembly convenience.

[0095] Furthermore, the valve shaft 21 includes a main shaft body 211, one end of which is provided with a mounting portion 213, and the second end of the main shaft body 211 abuts against the spherical surface 1121. The main shaft body 211 passes through the guide hole 3521. The outer side wall of the main shaft body 211 is provided with an outwardly protruding pressing protrusion 212, which is located on the side of the guide member 352 facing the valve stem assembly 1.

[0096] This embodiment also provides a gas appliance including the aforementioned gas proportional valve. By employing the aforementioned gas proportional valve, the stability and reliability of the gas supply to the gas appliance can be improved, the noise during operation of the gas appliance can be reduced, and the user experience of the gas appliance can be enhanced.

[0097] 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.

[0098] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A gas proportional valve characterized by, The valve seat assembly (3) comprises an air inlet channel (321), a valve mounting cavity (36) and an air outlet channel (311) which are sequentially communicated, the valve mounting cavity (36) is provided with a valve port (354), and a guide component (352) with a guide hole (3521) is arranged in the valve mounting cavity (36). The valve core assembly (2) is installed in the valve mounting cavity (36) and comprises a valve shaft (21) and a valve core (22) connected to the first end of the valve shaft (21), the valve shaft (21) is slidably arranged in the guide hole (3521) along the axial direction, so that the valve core (22) adjusts the opening degree of the valve port (354). The valve rod assembly (1) is coaxially installed in the valve mounting cavity (36) with the valve core assembly (2), the valve rod assembly (1) comprises a connecting rod (11) and a main diaphragm (12) sleeved on the connecting rod (11), the main diaphragm (12) divides the valve mounting cavity (36) into a first cavity (361) and a second cavity (362), the valve port (354) and the valve core assembly (2) are arranged in the first cavity (361), the first end surface of the connecting rod (11) is a spherical surface (1121), the center of the spherical surface (1121) is located on the axis of the valve core assembly (2), and the center of the spherical surface (1121) is located on the connecting plane of the main diaphragm (12) and the connecting rod (11), the connecting plane is perpendicular to the connecting rod (11), and the spherical surface (1121) can abut against the second end of the valve shaft (21). The electromagnetic assembly (4) is used to drive the valve rod assembly (1) to move towards the valve core assembly (2) to push the valve rod assembly (1) to open the valve port (354). The elastic member (5) is used to apply an elastic force to the valve core assembly (2) to make the valve core assembly (2) move towards the valve rod assembly (1). The main diaphragm (12) comprises a ring plate part (122) and a main deformation part (123) which are coaxially connected from inside to outside, the ring plate part (122) is sleeved on the connecting rod (11) and perpendicular to the axial direction of the valve shaft (21), and the main deformation part (123) is an arc-shaped ring structure with an opening facing the valve port (354), and the center plane of the ring plate part (122) is the connecting plane.

2. Gas proportional valve according to claim 1, characterized in that The connecting rod (11) comprises a main rod body (111), the main diaphragm (12) is sleeved on the main rod body (111), the first end of the main rod body (111) is connected with a pushing part (112), the outer diameter of the pushing part (112) is greater than that of the main rod body (111), and the end surface of the end of the pushing part (112) away from the main rod body (111) forms the spherical surface (1121).

3. Gas proportional valve according to claim 1, characterized in that In addition, in the projection plane perpendicular to the axis of the valve shaft (21), the area of the normal projection of the spherical surface (1121) in the projection plane is greater than the area of the second end surface of the valve shaft (21). ​ 4. Gas proportional valve according to claim 1, characterized in that When the electromagnetic assembly (4) is in a power-off state, the valve core member (22) blocks the valve port (354), and a preset gap is provided between the spherical surface (1121) and the second end of the valve shaft (21).

5. Gas proportional valve according to claim 4, characterized in that The preset gap is 0.5mm-2mm.

6. Gas proportional valve according to any of claims 1 to 5, characterized in that The valve stem assembly (1) further comprises an auxiliary diaphragm (13) sleeved on the connecting rod (11) and spaced apart from the main diaphragm (12), the auxiliary diaphragm (13) divides the first cavity (361) into a pressure stabilizing cavity (3612) and a flow cavity (3611), the valve port (354) and the valve core assembly (2) are arranged in the flow cavity (3611), and the pressure stabilizing cavity (3612) is located between the main diaphragm (12) and the auxiliary diaphragm (13); the diaphragm stress area of the auxiliary diaphragm (13) is smaller than that of the main diaphragm (12). The valve seat assembly (3) is provided with a pressure guiding channel (37), a first end of the pressure guiding channel (37) is in communication with the air inlet channel (321), and a second end of the pressure guiding channel (37) is in communication with the pressure stabilizing cavity (3612).

7. Gas proportional valve according to claim 6, characterized in that The valve stem assembly (1) further comprises a supporting member (15) sleeved on the connecting rod (11), a first end of the connecting rod (11) has a limiting structure protruding in the radial direction, and a second end of the connecting rod (11) is provided with a magnet assembly (14); the auxiliary diaphragm (13) is clamped between the supporting member (15) and the limiting structure, and the main diaphragm (12) is clamped between the supporting member (15) and the magnet assembly (14).

8. Gas proportional valve according to claim 6, characterized in that The valve seat assembly (3) comprises a main seat body, a diaphragm seat (33) and a valve cover (34) which are detachably connected in sequence along the axial direction of the valve shaft (21); the main seat body is provided with the air inlet channel (321), the flow cavity (3611) and the air outlet channel (311); the peripheral seal of the auxiliary diaphragm (13) is clamped between the main seat body and the first end of the diaphragm seat (33); the peripheral seal of the main diaphragm (12) is clamped between the valve cover (34) and the second end of the diaphragm seat (33); and the electromagnetic assembly (4) is mounted on the valve cover (34).

9. Gas proportional valve according to claim 8, characterized in that A valve core seat (35) is detachably mounted in the valve mounting cavity (36), the valve core seat (35) has an airflow channel (3511) penetrating through along the axial direction of the valve shaft (21), one end of the airflow channel (3511) away from the connecting rod (11) forms the valve port (354), and the guide member (352) is arranged in the airflow channel (3511).

10. Gas proportional valve according to claim 9, characterized in that The valve core seat (35) comprises an outer seat portion (351) spaced apart and sleeved outside the guide member (352) and a connecting portion (353) connected between the outer seat portion (351) and the guide member (352), and the outer seat portion (351) is in sealing connection with the cavity wall of the valve mounting cavity (36); The outer wall of the valve shaft (21) is provided with a pressing protrusion (212), the elastic member (5) is sleeved outside the guide part (352), one end of the elastic member (5) is in abutment with the connecting part (353), and the other end of the elastic member (5) is in abutment with the pressing protrusion (212).

11. Gas proportional valve according to claim 9, characterized in that The valve seat assembly (3) comprises an inlet seat (32) and an outlet seat (31) which are arranged separately along the axial direction of the valve shaft (21) and are detachably connected, the outlet seat (31) is provided with the outlet passage (311), the inlet seat (32) is provided with the inlet passage (321), the inlet seat (32) and the outlet seat (31) share the valve mounting cavity (36) which is formed at least partially, and the valve core seat (35) is clamped between the inlet seat (32) and the outlet seat (31).

12. A gas appliance characterised in that, A gas proportional valve comprising a valve body (1) and a valve shaft (21) arranged in the valve body (1), the valve shaft (21) being provided with a valve core (22) and a valve core seat (35), the valve core (22) being arranged in the valve core seat (35), the valve core (22) being provided with a valve core sealing surface (221), the valve core seat (35) being provided with a valve core seat sealing surface (351), the valve core (22) being provided with a valve core sealing surface (221), the valve core seat (35) being provided with a valve core seat sealing surface (351), the valve core (22) being provided with a valve core sealing surface (221), the valve core seat (35) being provided with a valve core seat sealing surface (351), the valve core (22) being provided with a valve core sealing surface (221), the valve core seat (35) being provided with a valve core seat sealing surface (351), the valve core (22) being provided with a valve core sealing surface (221), the valve core seat (35) being provided with a valve core seat sealing surface (351), the valve core (22) being provided with a valve core sealing surface (221), the valve core seat (35) being provided with a valve core seat sealing surface (351), the valve core (22) being provided with a valve core sealing surface (221), the valve core seat (35) being provided with a valve core seat sealing surface (351), the valve core (22) being provided with a valve

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