Gas proportional valve and gas equipment

Abstract

The utility model belongs to the field of valve technology, and specifically discloses a gas proportional valve and gas equipment. The gas proportional valve includes a valve seat assembly, a valve core assembly, a valve stem assembly, an electromagnetic assembly and an elastic member. The valve stem assembly and the valve core assembly are coaxially installed in the valve installation cavity. The valve stem assembly includes a connecting rod and a main diaphragm. The main diaphragm divides the valve installation cavity into a first cavity and a second cavity. The first end face of the connecting rod is a spherical surface. The center of the sphere corresponding to the spherical surface is located on the axis of the valve core assembly and on the connection plane between the connecting rod and the main diaphragm. The spherical surface can abut against the second end of the valve core assembly; the electromagnetic assembly drives the valve stem assembly to move in the direction toward the valve core assembly to push the valve stem assembly to open the valve port. The gas proportional valve and gas equipment disclosed by the utility model can reduce the influence of the vibration of the valve stem assembly on the valve core assembly, improve the pressure stabilizing effect of the gas proportional valve, and reduce the operating noise of the gas proportional valve and the gas equipment.

Description

Technical Field

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

[0002] The gas proportional valve is the core component of the gas water heater. Its functions include stabilizing the output pressure of the gas and adjusting the flow of the gas according to the size of the control current. The gas proportional valve usually includes an electromagnetic mechanism and a valve core assembly. The valve core assembly includes a valve stem, a valve core installed at the first end of the valve stem, and a magnet installed at the second end of the valve stem. The valve stem is installed on the valve seat through a diaphragm, and the electromagnetic mechanism is located on the side of the valve stem away from the valve core. When the electromagnetic mechanism is energized, the magnetic field generated acts on the magnet, driving the magnet to move along the axial direction of the valve stem, thereby driving the valve core assembly to move, so as to adjust the opening between the valve core and the valve port, and then adjust the flow and gas output pressure.

[0003] During the use of the gas proportional valve, due to the impact of gas turbulence, diaphragm assembly stress or assembly error and other factors, the valve stem and valve core may swing in the radial direction and deviate, resulting in noise and unstable outlet pressure during operation of the gas proportional valve; at the same time, since a magnet is provided on the valve stem, the weight of the magnet will further affect the radial swing of the valve stem.

[0004] To solve this problem, in the prior art, a guide structure is usually provided on the valve seat to limit the valve stem to move only in its axial direction. However, when the valve stem has a tendency to swing in the radial direction, the guide structure limits the valve stem through its physical contact with the side wall of the valve stem. When the valve stem moves in the axial direction, there will be axial friction between the valve stem and the guide structure, thereby hindering the axial movement of the valve stem, reducing the smoothness of the axial movement of the valve stem, and easily causing the valve stem to wear and affect the service life of the gas proportional valve; at the same time, the greater the tendency of the valve stem to swing in the radial direction, the greater the friction between the valve stem and the guide structure, the greater the hindrance to the axial movement of the valve stem, which will affect the pressure regulation and stabilization effect of the gas proportional valve, resulting in adverse phenomena such as a larger hysteresis or a sudden pressure change at the outlet pressure of the gas proportional valve. Utility Model Content

[0005] One of the technical problems solved by the utility model is to provide a gas proportional valve, which can effectively solve the problem that the axial friction of the valve stem increases during operation due to the existing use of a guide structure to achieve valve stem anti-overturning, thereby causing wear and poor pressure stabilization effect. While achieving the valve stem anti-overturning effect, the smoothness of the valve stem operation is improved to ensure the pressure stabilization effect of the gas proportional valve.

[0006] The second technical problem solved by the utility model is to provide a gas equipment, which can effectively solve the problem of poor operating stability of existing gas equipment due to the difficulty in balancing the pressure regulating and stabilizing effect and the anti-overturning effect of the gas proportional valve, thereby improving the operating 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 comprises an air inlet passage, a valve installation cavity and an air outlet passage which are connected in sequence, a valve port is arranged in the valve installation cavity, and a guide component with a guide hole is arranged in the valve installation cavity;

[0010] A valve core assembly is installed in the valve installation cavity and includes a valve shaft and a valve core member connected to a first end of the valve shaft, wherein the valve shaft can be slidably arranged in the guide hole along its axial direction so that the valve core member can adjust the opening of the valve port;

[0011] A valve stem assembly is coaxially mounted on the valve mounting cavity with the valve core assembly, the valve stem assembly comprises 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 arranged in the first cavity, the first end face of the connecting rod is a spherical surface, the spherical center corresponding to the spherical surface is located on the axis of the valve core assembly, and the spherical center is located on the connecting plane between the main diaphragm and the connecting rod, the connecting plane is perpendicular to the connecting rod, and the spherical surface can abut against the second end of the valve shaft;

[0012] An electromagnetic assembly, used for driving 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] The elastic member is used to apply an elastic force to the valve core assembly so as to cause the valve core assembly to move toward the valve stem assembly.

[0014] Compared with the background technology, the gas proportional valve described in the utility model has the following beneficial effects: since the first end of the connecting rod is provided with a spherical surface, when the gas proportional valve is in an open state, the spherical surface contacts the second end point of the valve core assembly; since the spherical center corresponding to the spherical surface is located on the axis of the valve core assembly, and the spherical center is located on the connecting plane between the main diaphragm and the connecting rod, when the connecting rod is swung by external impact or other reasons, the connecting rod basically swings with the center of the spherical surface as the swinging fixed point, and since the spherical surface contacts the second end point of the valve core assembly, when the connecting rod swings, the spherical surface and the second end of the valve core assembly always maintain a point contact position, and the contact position of the two will not change in the first direction, so that the swing of the connecting rod will not drive the valve core assembly to move, thereby avoiding the swing of the connecting rod causing the opening of the valve port to change, thereby not The problem of increasing differential pressure or sudden change of outlet pressure is eliminated, which effectively ensures the pressure stabilizing effect of the gas proportional valve. Compared with the solution in which the diaphragm is directly installed on the valve core assembly and only the guide interface is used to realize the anti-swing setting of the valve core assembly, the connecting rod and the valve shaft are non-connected, so that when the connecting rod swings, its swing will not affect the movement of the valve core assembly, so that the valve core assembly only moves axially along the guide hole, and there will be no large friction between the valve shaft and the hole wall of the guide hole, and the friction between the hole wall of the guide hole and the valve shaft will not be affected by the swing amplitude of the connecting rod, which effectively avoids valve shaft wear and valve core member position displacement due to the swing of the connecting rod. Furthermore, the point contact area between the connecting rod and the valve core assembly is small, the friction generated is small, and the wear caused is also small, which ensures the smooth operation of the valve core assembly in long-term use and improves the long-term use 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 inside to 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 an opening toward the valve port, and the central plane of the annular plate portion is the connecting plane.

[0016] In one embodiment, the connecting rod comprises 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 push portion, the outer diameter of the push portion is larger than the outer diameter of the main rod body, and an end surface of the push portion away from the main rod body forms the spherical surface;

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

[0018] In one of the embodiments, when the electromagnetic assembly is in a power-off state, the valve core member blocks the valve port, and a preset gap is provided between the spherical surface and the second end of the valve shaft.

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

[0020] In one embodiment, the valve stem assembly further comprises an auxiliary diaphragm, the auxiliary diaphragm 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 arranged in the flow cavity, the pressure-stabilizing cavity is located between the main diaphragm and the auxiliary diaphragm, and the diaphragm force-bearing area of ​​the auxiliary diaphragm is smaller than the diaphragm force-bearing area of ​​the main diaphragm;

[0021] The valve seat assembly is provided with a pressure-inducing channel, a first end of the pressure-inducing channel is communicated with the air inlet channel, and a second end of the pressure-inducing channel is communicated with the pressure-stabilizing chamber.

[0022] In one embodiment, the valve stem assembly also includes a supporting member, which is sleeved on the connecting rod, the first end of the connecting rod has a radially protruding limiting structure, the second end of the connecting rod is equipped with a magnet assembly, the auxiliary diaphragm is clamped between the supporting member and the limiting structure, and the main diaphragm is clamped between the supporting 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 which are detachably connected in sequence along the axial direction of the valve shaft, the main seat body has the air inlet channel, the flow cavity and the air outlet channel, the peripheral sealing clamp of the auxiliary diaphragm is arranged between the main seat body and the first end of the diaphragm seat, the peripheral sealing clamp of the main diaphragm is arranged between the valve cover and the second end of the diaphragm seat, and the electromagnetic assembly is installed on the valve cover.

[0024] In one embodiment, a valve core seat is detachably installed in the valve mounting cavity, and the valve core seat has an air flow channel extending axially through the valve shaft, and the valve port is formed at one end of the air flow channel away from the connecting rod, and the guide component is arranged in the air flow channel.

[0025] In one embodiment, the valve core seat comprises an outer seat portion spaced apart and sleeved outside the guide component and a connecting portion connected between the outer seat portion and the guide component, and the outer seat portion is sealingly connected to the cavity wall of the valve installation cavity;

[0026] The outer wall of the valve shaft is convexly provided with a pressing convex portion, the elastic member is sleeved on the outer side of the guide member, one end of the elastic member is in contact with the connecting portion, and the other end of the elastic member is in contact with the pressing convex portion.

[0027] In one embodiment, the valve seat assembly includes an inlet seat and an outlet seat which are separately arranged along the axial direction of the valve shaft and are detachably connected, the outlet seat is provided with the outlet passage, the inlet seat is provided with the inlet passage, the inlet seat and the outlet seat jointly form at least a portion of the valve mounting cavity, and the valve core seat is clamped between the inlet seat and the outlet seat.

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

[0029] A gas device comprises the gas proportional valve as described above.

[0030] Compared with the background technology, the gas equipment described in the utility model has the following beneficial effects: by adopting the above-mentioned gas proportional valve, the gas supply stability and reliability of the gas equipment can be improved, the noise during the operation of the gas equipment can be reduced, and the user experience of the gas equipment can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the disassembled structure of a gas proportional valve provided in one embodiment of the utility model;

[0032] Figure 2 A structural cross-sectional view of a gas proportional valve provided in an embodiment of the utility model when in a closed state;

[0033] Figure 3 A structural cross-sectional view of a gas proportional valve provided in an embodiment of the utility model when in an open state;

[0034] Figure 4 for Figure 3 A partial enlarged view of point I in the middle;

[0035] Figure 5 A schematic diagram of the assembly structure of the connecting rod and the main diaphragm provided in one embodiment of the utility model;

[0036] Figure 6 A structural cross-sectional view of a valve stem assembly provided in one embodiment of the utility model;

[0037] Figure 7 A schematic diagram of the disassembled structure of a valve stem assembly provided in one embodiment of the utility model;

[0038] Figure 8 A partial structural schematic diagram of a gas proportional valve provided in one embodiment of the utility model;

[0039] Fig. 9 for Figure 8 Schematic diagram of the split structure of the middle structure;

[0040] Fig.10A cross-sectional view of a gas proportional valve provided in another embodiment of the utility model when in an open state.

[0041] Description of labels:

[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 seat; 143. Gland; 15. Supporting member; 151. Supporting plate; 1511. Flat supporting part; 1512. Arc-shaped supporting part; 1513. Positioning ring part; 152. Supporting sleeve; 1521. Positioning groove; 16. Pressing member;

[0043] 2. valve core assembly; 21. valve shaft; 211. main shaft body; 212. pressing convex part; 213. mounting part; 22. valve core member;

[0044] 3. Valve seat assembly; 31. Air outlet seat; 311. Air outlet channel; 32. Air inlet seat; 321. Air inlet channel; 33. Diaphragm seat; 34. Valve cover; 341. Limiting protrusion; 342. Positioning protrusion; 35. Valve core seat; 351. External seat; 3511. Air flow channel; 352. Guide component; 3521. Guide hole; 353. Connecting part; 354. Valve port; 36. Valve installation cavity; 361. First cavity; 3611. Circulation cavity; 3612. Pressure stabilizing cavity; 362. Second cavity; 37. Pressure induction channel; 38. First sealing ring; 39. Second sealing ring; 310. Third sealing ring;

[0045] 4. Electromagnetic component; 5. Elastic part; A. Swinging fixed point. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

[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 passage 321, a valve installation cavity 36 and an outlet passage 311 which are connected in sequence. A valve port 354 is arranged in the valve installation cavity 36. A guide component 352 having a guide hole 3521 is arranged in the valve installation cavity 36. The valve core assembly 2 is installed in the valve installation cavity 36 and includes a valve shaft 21 and a valve core member 22 connected to the first end of the valve shaft 21. The valve shaft 21 can be slidably penetrated in the guide hole 3521 along its axial direction so that the valve core member 22 can adjust the opening of the valve port 354. The valve stem assembly 1 is coaxially installed in the valve installation cavity 36 with the valve core assembly 2. The valve stem assembly 1 includes a connecting rod 11 and a main diaphragm 12 sleeved on the connecting rod 11. The main diaphragm The plate 12 divides the valve installation cavity 36 into a first cavity 361 and a second cavity 362. The valve port 354 and the valve core assembly 2 are both arranged in the first cavity 361. The first end surface of the connecting rod 11 is a spherical surface 1121. The spherical surface 1121 corresponds to the center of the sphere, and the center of the sphere is located in 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 assembly 4 is used to drive the valve stem assembly 1 to move in a direction toward the valve core assembly 2 to push the valve stem 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 toward the valve stem assembly 1.

[0052] The gas proportional valve provided in this embodiment enables, when the electromagnetic assembly 4 is energized, the electromagnetic assembly 4 can drive the connecting rod 11 to move in a direction toward the valve core assembly 2, thereby pushing the valve core assembly 2 to move in a first direction, so that the valve port 354 is opened; when the electromagnetic assembly 4 is de-energized, the valve core assembly 2 moves in a direction toward the valve stem assembly 1 under the action of the restoring force of the elastic member 5, so that the valve core assembly 2 can be reset to a position closing the valve port 354, and the valve stem assembly 1 is reset to a closed state.

[0053] The gas proportional valve provided in the present embodiment has a spherical surface 1121 provided at the first end of the connecting rod 11. When the gas proportional valve is in an open state, the spherical surface 1121 contacts the second end point of the valve core assembly 2. Since the spherical center corresponding to the spherical surface 1121 is located on the axis of the valve core assembly 2, and the spherical center is located on the connecting plane between the main diaphragm 12 and the connecting rod 11, when the connecting rod 11 is swung by external impact or other reasons, the connecting rod 11 basically swings with the center of the spherical surface 1121 as the swinging fixed point A. Since the spherical surface 1121 contacts the second end point of the valve core assembly 2, when the connecting rod 11 swings, the spherical surface 1121 and the second end of the valve core assembly 2 always maintain a point contact position, and the contact position of the two will not change in the first direction, so that the swing of the connecting rod 11 will not drive the valve core assembly 2 to move, thereby preventing the swing of the connecting rod 11 from causing the opening of the valve port 354 to change, thereby preventing the difference from becoming larger or The problem of sudden change in outlet pressure is solved, and the pressure stabilizing effect of the gas proportional valve is effectively guaranteed; compared with the solution in which the diaphragm is directly installed on the valve core assembly and the anti-swing setting of the valve core assembly is realized only by the guide interface, the connecting rod 11 and the valve shaft 21 are non-connected, so that when the connecting rod 11 swings, its swing will not affect the movement of the valve core assembly 2, so that the valve core assembly 2 only moves axially along the guide hole 3521, and there will be no large friction between the valve shaft 21 and the hole wall of the guide hole 3521, and the friction between the hole wall of the guide hole 3521 and the valve shaft 21 will not be affected by the swing amplitude of the connecting rod 11, effectively avoiding the wear of the valve shaft 21 and the position displacement of the valve core member 2 due to the swing of the connecting rod 11; furthermore, the point contact area between the connecting rod 11 and the valve core assembly 2 is small, the friction force generated is small, and the wear caused is also small, which ensures the smooth operation of the valve core assembly 2 in the long-term use state, reduces the noise of the gas proportional valve during operation, and improves the long-term use reliability of the gas proportional valve.

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

[0055] like Figure 2 and Figure 3 As shown, in order to better achieve the cooperation between the valve stem assembly 1 and the electromagnetic assembly 4, the second end of the connecting rod 11 is installed with a magnet assembly 14, which is located in the second cavity 362 and includes a magnet 141. The electromagnetic assembly 4 and the magnet assembly 14 are arranged opposite to each other in the first direction. When the electromagnetic assembly 4 is powered on, 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 in the direction toward the valve core assembly 2. When the electromagnetic assembly 4 is powered off, the magnet 14 moves and resets in the direction toward the electromagnetic assembly 4 under the magnetic attraction of the iron core inside the electromagnetic assembly 4.

[0056] In one embodiment, the electromagnetic assembly 4 is installed on the outside of the valve seat assembly 3, thereby reducing the difficulty of assembling the electromagnetic assembly 4 on the valve seat assembly 3, simplifying the structure of the electromagnetic assembly 4, and improving the convenience of disassembling and assembling the electromagnetic assembly 4 relative to the valve seat assembly 3. The specific structure of the electromagnetic assembly 4 can be set with reference to the prior art, which is not the focus of the present utility model and will not be described in detail.

[0057] Further, a limiting protrusion 341 is provided on the bottom of the second cavity 362 away from the first cavity 361, and the limiting protrusion 341 can abut against the electromagnetic assembly 4 to limit the travel 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 an annular structure and is coaxially arranged with the connecting rod 11. In other embodiments, the limiting protrusion 341 can also be a convex point structure, and a plurality of limiting protrusions 341 are arranged at intervals along the circumference of the connecting rod 11.

[0058] To ensure that the valve core assembly 2 can return to the position of closing the valve port 354 after the electromagnetic assembly 4 is disconnected, when the electromagnetic assembly 4 is powered off, a preset gap is provided between the spherical surface 1121 and the second end surface of the valve core assembly 2, thereby allowing the valve core assembly 2 and the valve stem assembly 1 to separate in a first direction during the resetting process, thereby preventing the valve stem assembly 1 from applying a thrust force toward the valve port 354 to the valve core assembly 2, thereby reliably ensuring that the valve core assembly 2 can return to the position of closing the valve port 354 under the elastic force of the elastic member 5, thereby ensuring the reliability and safety of the gas proportional valve.

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

[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 in the projection plane is larger than the area of ​​the second end surface of the valve shaft 21. This can better ensure that the connecting rod 11 can always keep in contact with the second end surface of the valve shaft when swinging, thereby ensuring that the connecting rod 11 always applies a thrust force to the valve core assembly 2, avoiding the problem of the valve core assembly 2 being reset under the action of the 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 is sleeved on the main rod body 111, a first end of the main rod body 111 is connected to a push portion 112, the outer diameter of the push portion 112 is greater than the outer diameter of the main rod body 111, and an end surface of the push portion 112 away from the main rod body 111 forms a spherical surface 1121. Thus, the area of ​​the spherical surface 1121 can be increased on the basis of the unchanged diameter of the main rod body 111, thereby increasing the contact area between the connecting rod 11 and the valve shaft 21, while reducing the overall weight and space occupied by the valve stem assembly 1, effectively preventing the valve shaft 21 and the connecting rod 11 from being disengaged due to swinging when in contact, improving the abutment stability and reliability of the valve stem assembly 1 against the valve core assembly 2, thereby improving the operating 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 which are coaxially connected from the inside to the outside. The annular plate portion 122 is interference fit on the connecting rod 11, and the annular plate portion 122 is perpendicular to the connecting rod 11; the main deformation portion 123 is an arc-shaped annular structure with an opening toward the valve port 354, and the main sealing ring portion 124 is sealed with the valve seat assembly 3, thereby facilitating the deformation of the main diaphragm 12 when the pressure difference on both sides thereof changes.

[0063] The central plane of the annular plate portion 122 is the connecting plane, that is, the center of the spherical surface 1121 forms a swing point A, and the center of the spherical surface 1121 is located in the plane where the annular plate portion 122 is located, so that when the connecting rod 11 is impacted and deflected, it can swing around the swing point A. Since the swing point A is located in the plane of the annular plate portion 122, the influence of the swing of the connecting rod 11 on the main diaphragm 12 can be reduced, so that even if the connecting rod 11 swings, the main diaphragm 12 will basically not be deformed, thereby ensuring the stability of the main diaphragm 12. At the same time, this arrangement enables the main diaphragm 12 to better exert a force on the connecting rod 11 to limit its swing when the connecting rod 11 swings, thereby reducing the swing amplitude of the connecting rod 11 and improving the operating stability and reliability of the valve stem assembly 1.

[0064] In order to improve the connection stability between the main diaphragm 12 and the connecting rod 11, a collar portion 121 is convexly provided on one side of the ring plate portion 122, and the inner diameter of the collar portion 121 is equal to the inner diameter of the ring plate portion 122, and the collar portion 121 is interference fit on the connecting rod 11. While reducing the overall thickness of the main diaphragm 12, the contact area between the main diaphragm 12 and the connecting rod 11 is increased, 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 also 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 arranged 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 area of ​​the auxiliary diaphragm 13 is smaller than the diaphragm force area of ​​the main diaphragm 12. The valve seat assembly 3 is provided with a pressure-inducing channel 37, a first end of the pressure-inducing channel 37 is connected to the air inlet channel 321, and a second end of the pressure-inducing channel 37 is connected to the pressure-stabilizing cavity 3612.

[0066] By providing the auxiliary diaphragm 13, the swing energy of the connecting rod 11 is absorbed by the auxiliary diaphragm 13, thereby reducing the swing amplitude of the connecting rod 11, and further improving the operating reliability and stability of the valve stem assembly 1; at the same time, by cooperating with the pressure-inducing channel 37, the gas entering the air inlet channel 321 enters the pressure-stabilizing chamber 3612 through the pressure-inducing channel 37, so that the air pressure in the pressure-stabilizing chamber 3612 is the same as the air inlet pressure of the air inlet channel 321, so that when the air inlet pressure in the air inlet channel 321 changes, the air pressure in the pressure-stabilizing chamber 3612 changes, causing the main diaphragm 12 And the auxiliary diaphragm 13 is deformed, driving 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, thereby improving the pressure stabilization effect; moreover, since the pressure of the pressure stabilizing chamber 3612 is the same as the pressure of the intake channel 321, the opening of the valve port 354 can be adjusted once the intake pressure changes, so that the adjustment timing of the valve port 354 opening is basically consistent with the change of the intake pressure, thereby improving the pressure stabilization efficiency and the pressure regulation and stabilization sensitivity, and improving the performance of the gas proportional valve.

[0067] Specifically, when the intake pressure increases, the pressure in the pressure-stabilizing chamber 3612 increases, thereby making the pressure in the pressure-stabilizing chamber 3612 greater than the pressure in the circulation chamber 3611, so that the auxiliary diaphragm 13 is deformed in the direction toward the valve port 354 under the action of the air pressure difference on both sides, and the main diaphragm 12 is deformed in the direction away from the valve port 354 under the action of the air pressure difference on both sides. Since the diaphragm force area of ​​the auxiliary diaphragm 13 is smaller than the diaphragm force area of ​​the main diaphragm 12, the deformation of the main diaphragm 12 is greater than the deformation of the auxiliary diaphragm 13, so that the connecting rod 11 as a whole moves in the direction away from the valve port 354, and then the valve core assembly 2 moves in the direction toward the connecting rod 11 under the action of the elastic force, the opening of the valve port 354 is reduced, so that the gas circulation area is reduced, the pressure loss is increased, and the outlet pressure of the gas outlet channel 311 can remain unchanged, thereby realizing the pressure stabilization function.

[0068] It is worth noting that, in other embodiments, Fig.10As shown, the auxiliary diaphragm 13 and the pressure-inducing channel 37 may not be provided. At this time, when the intake pressure increases, the overall pressure of the valve mounting chamber 36 increases, so that the main diaphragm 12 is deformed in the direction away from the valve port 354 under the action of the pressure difference on both sides, driving the connecting rod 11 to move in the direction away from the valve port 354, and thus the valve core assembly 2 can move in the direction toward the connecting rod 11 under the action of the elastic member 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 which are sequentially connected from inside to outside. The auxiliary deformation portion 133 is an arc-shaped ring structure with an opening toward the main diaphragm 12. The inner ring portion 131 is interference-fitted on the main rod body 111.

[0070] It is worth noting that the diaphragm force 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 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, in order to improve the setting stability and reliability of the main diaphragm 12, the valve stem assembly 1 also includes a supporting member 15, and the supporting member 15 and the magnet assembly 14 are respectively located on the opposite sides of the main diaphragm 12, and the main diaphragm 12 is clamped between the supporting member 15 and the magnet assembly 14, thereby ensuring the position accuracy of the main diaphragm 12 and the connecting rod 11 in the first direction, and at the same time ensuring that the annular plate portion 122 can maintain a planar state under the clamping action of the supporting member 15 and the magnet assembly 14, thereby limiting the deformation of the annular plate portion 122 during the process of the valve stem assembly 1.

[0072] Furthermore, in order 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, and the auxiliary diaphragm 13 is sandwiched between the supporting member 15 and the limiting structure, thereby ensuring the relative position accuracy of the main diaphragm 12, the supporting member 15 and the auxiliary diaphragm 13 in the first direction. Specifically, the portion of the push portion 112 protruding radially from the main rod body 111 forms a limiting structure, and the inner ring portion 131 is sandwiched between the push portion 112 and the supporting sleeve 152.

[0073] Further, the push portion 112 has an annular groove 1122 arranged around the main rod body 111, and the inner ring portion 131 has a boss portion 132 protruding along the direction away from the bearing sleeve 152, and the boss portion 132 is inserted into the annular groove 1122 to increase the contact area between the auxiliary diaphragm 13 and the main rod body 111 while reducing the spacing between the bearing sleeve 152 and the limiting portion. Further, a pressing protrusion 113 is protruding at the bottom of the annular groove 1122, and the pressing protrusion 113 is in contact with the end surface of the boss portion 132 to ensure the pressing effect between the boss portion 132 and the push portion 112, so as 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 body 111.

[0074] In order to improve the installation convenience of the magnet 141, the magnet assembly 14 also includes a mounting seat 142, the mounting seat 142 is sleeved on the second end of the connecting rod 11, the magnet 141 is mounted on the mounting seat 142, and the ring plate portion 122 is sandwiched between the mounting seat 142 and the supporting member 15. In one embodiment, a limiting groove is provided on the mounting seat 142, the limiting groove is arranged around the connecting rod 11, and the collar portion 121 is arranged in the limiting groove. In other embodiments, the supporting member 15 may be provided with a limiting groove.

[0075] In order to improve the convenience of assembly and disassembly of the magnet 141, an installation groove is provided on the mounting seat 142, and the magnet 141 is accommodated in the mounting groove. The magnet assembly 14 also includes a pressure cover 143, which is covered on the notch of the mounting groove and is detachably connected to the mounting seat 142 to limit the magnet 141 from escaping from the mounting groove, thereby improving the stability and reliability of the setting of the magnet 141. The mounting seat 142 and the pressure cover 143 are preferably arranged in a snap-fitting manner to improve the convenience of assembly and disassembly and simplify the structure. In other embodiments, the mounting seat 142 and the pressure cover 143 can also be connected by screws. Furthermore, the pressure cover 143 abuts against the limiting protrusion 341 to the movement stroke of the magnet assembly 14.

[0076] In one embodiment, the mounting seat 142 has an escape groove connected to the mounting groove, and the groove wall of the escape groove is provided with an installation hole, and the second end of the connecting rod 11 passes through the installation hole and extends into the escape groove. In order to prevent the mounting seat 142 from slipping out of the connecting rod 11 along the first direction, a pressing piece 16 is detachably provided at the second end of the connecting rod 11, and the end of the mounting seat 142 away from the magnet 141 is clamped between the pressing piece 16 and the main diaphragm 12. The pressing piece 16 can be, but is not limited to, a retaining ring sleeved on the connecting rod 11, a pin radially penetrating the connecting rod 11, or a locking nut threaded on the outside of the connecting rod 11.

[0077] In order to better ensure the deformation performance of the main diaphragm 12, the supporting member 15 has an arc-shaped supporting portion 1512, the arc-shaped opening direction of the arc-shaped supporting portion 1512 is the same as the opening direction of the main deformation portion 123, and the radial width of the arc-shaped supporting portion 1512 is smaller than the radial width of the main deformation portion 123; the arc-shaped supporting 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 supporting portion 1512, and the largest concave part 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 supporting portion 1512. The setting of the arc-shaped supporting portion 1512 can support the main deformation portion 123 when the gas proportional valve is in a closed state, so that the main deformation portion 123 can better maintain a closed state, reducing the probability of collapse of the main deformation portion 123, thereby ensuring the deformation accuracy of the main deformation portion 123 after compression deformation.

[0078] In one embodiment, the supporting member 15 includes a supporting sleeve 152 and a supporting plate 151, both of which are sleeved on the connecting rod 11, and the supporting plate 151 is sandwiched between the supporting sleeve 152 and the main diaphragm 12, and the supporting plate 151 is provided with the above-mentioned arc-shaped supporting portion 1512, and the outer diameter of the supporting plate 151 is greater than the outer diameter of the supporting sleeve 152. This arrangement is conducive to increasing the stability and reliability of the arrangement of the supporting member 15 on the connecting rod 11, while improving the convenience of the arrangement of the arc-shaped supporting portion 1512 and reducing the difficulty of processing the supporting plate 151.

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

[0080] In one embodiment, the supporting plate 151 includes a flat supporting portion 1511, which is connected to the inner side of the arc-shaped supporting portion 1512, and the opposite sides of the flat supporting portion 1511 are respectively abutted against the end surfaces of the annular plate portion 122 and the supporting sleeve 152, and the annular plate portion 122 is clamped between the flat supporting portion 1511 and the end surface of the mounting seat 142, so that the flat supporting portion 1511 can fit the annular plate portion 122, thereby keeping the annular plate portion 122 in a flat plate state, thereby improving the setting stability of the main diaphragm 12.

[0081] The inner circle of the flat plate supporting part 1511 extends with a positioning ring part 1513 in the direction toward the supporting sleeve 152. The end surface of the supporting sleeve 152 is provided with a positioning groove 1521. The positioning ring part 1513 is inserted into the positioning groove 1521 to achieve the installation and positioning of the supporting sleeve 152 and the supporting member 15. Furthermore, the inner diameter of the positioning ring part 1513 is larger than the diameter of the main rod body 111 to reduce the difficulty of assembly.

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

[0083] like Figure 2 and Figure 3 As shown, in one embodiment, in order to improve the installation convenience 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 which are detachably connected in sequence along a first direction, the main seat body has the above-mentioned air inlet channel 321, the flow cavity 3611 and the air outlet channel 311, the first end of the flow cavity 3611 is provided with a valve port 354, the second end of the flow cavity 3611 passes through the end face of the main seat body to form a mounting port; the diaphragm seat 33 is arranged in an annular shape and is detachably installed on the end face where the mounting port is located, the auxiliary diaphragm 13 is clamped between the first end of the diaphragm seat 33 and the main seat body; the valve cover 34 is detachably arranged on the side of the diaphragm seat 33 away from the main seat body, and 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 installed on the valve cover 34. Therefore, when the valve stem assembly 1 needs to be disassembled, 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 portion 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 portion 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 cooperates with the diaphragm seat 33.

[0085] In one embodiment, a first sealing ring 38 is disposed between the diaphragm seat 33 and the main seat body, and the first sealing ring 38 is located outside the pressure-inducing channel 37 to prevent leakage of the pressure-stabilizing chamber 3612. Furthermore, an inner sealing groove and an outer sealing groove are provided at the first end of the diaphragm seat 33, and the outer sealing groove is arranged around 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 arranged in the outer sealing groove.

[0086] In order to improve the matching 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, and the positioning protrusion 342 is inserted into the positioning ring groove to achieve the assembly positioning of the two. In one embodiment, the diaphragm seat 33 is provided with a positioning ring groove, the positioning ring groove passes through the inner side wall 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 groove bottom of the sealing ring groove and the positioning protrusion 342.

[0087] like Figure 2 , Figure 3 , Figure 8 and Fig. 9 As shown, in order to improve the convenience of setting the guide component 352, a valve core seat 35 is detachably installed in the valve installation cavity 36, and the valve core seat 35 has an air flow channel 3511 that passes through along the first direction. The end of the air flow channel 3511 away from the connecting rod 11 forms a valve port 354, and a guide component 352 is arranged in the air flow channel 3511. By setting the valve core seat 35, when assembling the gas proportional valve, the valve core assembly 2 can be assembled on the valve core seat 35 first, and then the valve core seat 35 is matched with other structures on the valve seat assembly 3 to improve the assembly efficiency; at the same time, this arrangement can adapt to valve core assemblies 2 of different sizes and structures by changing the structure of the valve core seat 35 on the basis of the unchanged structures of the inlet channel 321, the valve installation cavity 36 and the outlet channel 311, thereby improving the versatility and use 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 air inlet seat 32 and an air outlet seat 31 which are separately arranged along the first direction and are detachably connected. The air outlet seat 31 is provided with an air outlet channel 311, and the air inlet seat 32 is provided with an air inlet channel 321. The air inlet seat 32 and the air outlet seat 31 jointly form at least part of the valve installation cavity 36, and the valve core seat 35 is sandwiched between the air inlet seat 32 and the air outlet seat 31. When it is necessary to disassemble the whole formed by the valve core assembly 2 and the valve core seat 35, the air inlet seat 32 is relatively removed, so that the valve core seat 35 and the valve core assembly 2 can be exposed, thereby improving the convenience of disassembly and assembly of the valve core assembly 2 and the valve core seat 35; at the same time, the valve core seat 35 is sandwiched between the air inlet seat 32 and the air outlet seat 31, so that the valve core seat 35 can be connected to the air inlet seat 32 or the air outlet seat 31 without using a fastening structure, thereby simplifying the structure of the valve seat assembly 3, reducing the number of components, and further improving the convenience 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, and the second sealing ring 39 is provided around the outer side of the valve core seat 35.

[0090] In order to improve the convenience of disassembly and assembly of the valve core seat 35, in one embodiment, a mounting groove is provided at the first end of the outlet seat 31, and 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, and the second end face of the valve core seat 35 abuts against the end face of the inlet seat 32, thereby sandwiching the valve core seat 35 between the end face of the inlet seat 32 and the groove wall of the mounting groove, so as to facilitate the installation and positioning of the valve core seat 35. In other embodiments, a mounting groove may be provided 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 which are coaxially and spaced apart, the outer seat portion 351 having a through airflow passage 3511, the guide member 352 being located inside the outer seat portion 351, and the outer side wall of the guide member 352 and the inner side wall of the outer seat portion 351 being connected via a connecting portion 353 to ensure the structural integrity of the valve core seat 35. Preferably, a plurality of 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 passage 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 cross-section of the outer seat portion 351 is a stepped structure, that is, the outer seat portion 351 includes a first seat portion, a second seat portion and a third seat portion which are coaxial and have gradually increasing outer diameters, and 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 whose groove diameters increase successively, the first seat portion cooperates with the first groove portion, the second seat portion cooperates with the second groove portion, and the third seat portion cooperates 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 valve core seat 35 and the inner wall of the gas outlet seat 31 to achieve a connection seal between the valve core seat 35 and the gas outlet seat 31, and prevent the gas from flowing from the gap between the valve core seat 35 and the gas outlet seat 31 to the gas 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 side wall of the first seat portion.

[0094] In one embodiment, the outer wall of the valve shaft 21 is provided with a pressing protrusion 212, the elastic member 5 is sleeved on the outer side of the guide member 352, and one end of the elastic member 5 is in contact with the connecting portion 353, and the other end of the elastic member 5 is in contact with the pressing protrusion 212. The structural arrangement of the elastic member 5 enables the valve core seat 35, the elastic member 5 and the valve core assembly 2 to be pre-assembled into an assembly, and then installed together in the valve installation cavity 36, effectively improving the assembly efficiency of the gas proportional valve and improving the 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 a second end of the main shaft body 211 is in contact with the spherical surface 1121. The main shaft body 211 is inserted into the guide hole 3521. The outer wall of the main shaft body 211 is provided with a pressing protrusion 212 protruding outward, and the pressing protrusion 212 is located on the side of the guide component 352 facing the valve stem assembly 1.

[0096] This embodiment also provides a gas device, including the above-mentioned gas proportional valve. By adopting the above-mentioned gas proportional valve, the gas supply stability and reliability of the gas device can be improved, the noise during the operation of the gas device can be reduced, and the user experience of the gas device can be improved.

[0097] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A gas proportional valve, characterized in that: include: A valve seat assembly (3) comprising an air inlet passage (321), a valve installation cavity (36) and an air outlet passage (311) which are connected in sequence, a valve port (354) being arranged in the valve installation cavity (36), and a guide component (352) having a guide hole (3521) being arranged in the valve installation cavity (36); A valve core assembly (2) is installed in the valve installation cavity (36) and comprises a valve shaft (21) and a valve core member (22) connected to a first end of the valve shaft (21), wherein the valve shaft (21) can be slidably arranged in the guide hole (3521) along its axial direction so that the valve core member (22) can adjust the opening of the valve port (354); A valve stem assembly (1) is coaxially mounted on the valve mounting cavity (36) with the valve core assembly (2), the valve stem assembly (1) comprising a connecting rod (11) and a main diaphragm (12) sleeved on the connecting rod (11), the main diaphragm (12) dividing 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 arranged 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 on the axis of the valve core assembly (2), and the center of the spherical surface is located on the connecting plane between 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); An electromagnetic assembly (4) for driving the valve stem assembly (1) to move in a direction toward the valve core assembly (2) so as to push the valve stem assembly (1) to open the valve port (354); An elastic member (5) is used to apply an elastic force to the valve core assembly (2) so as to cause the valve core assembly (2) to move toward the valve stem assembly (1).

2. The gas proportional valve according to claim 1, characterized in that: The main diaphragm (12) includes an annular plate portion (122) and a main deformation portion (123) which are coaxially connected from the inside to the outside, the annular plate portion (122) is sleeved on the connecting rod (11) and is perpendicular to the axial direction of the valve shaft (21), the main deformation portion (123) is an arc-shaped annular structure with an opening toward the valve port (354), and the central plane of the annular plate portion (122) is the connecting plane.

3. The 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 to a push portion (112), the outer diameter of the push portion (112) is greater than the outer diameter of the main rod body (111), and the end surface of the push portion (112) away from the main rod body (111) forms the spherical surface (1121); And / or, in a projection plane perpendicular to the axis of the valve shaft (21), the orthographic projection area of ​​the spherical surface (1121) in the projection plane is larger than the area of ​​the second end surface of the valve shaft (21).

4. The gas proportional valve according to claim 1, characterized in that: When the electromagnetic assembly (4) is in a power-off state, the valve core component (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. The gas proportional valve according to claim 4, characterized in that: The preset gap is 0.5 mm to 2 mm.

6. The gas proportional valve according to any one of claims 1 to 5, characterized in that: The valve stem assembly (1) further comprises an auxiliary diaphragm (13), the auxiliary diaphragm (13) being sleeved on the connecting rod (11) and spaced apart from the main diaphragm (12), the auxiliary diaphragm (13) dividing the first cavity (361) into a pressure-stabilizing cavity (3612) and a circulation cavity (3611), the valve port (354) and the valve core assembly (2) being arranged in the circulation cavity (3611), the pressure-stabilizing cavity (3612) being located between the main diaphragm (12) and the auxiliary diaphragm (13), and the diaphragm force-bearing area of ​​the auxiliary diaphragm (13) being smaller than the diaphragm force-bearing area of ​​the main diaphragm (12); The valve seat assembly (3) is provided with a pressure-inducing channel (37), a first end of the pressure-inducing channel (37) is in communication with the air inlet channel (321), and a second end of the pressure-inducing channel (37) is in communication with the pressure-stabilizing chamber (3612).

7. The gas proportional valve according to claim 6, characterized in that: The valve stem assembly (1) also includes a supporting member (15), the supporting member (15) is sleeved on the connecting rod (11), the first end of the connecting rod (11) has a radially protruding limiting structure, the second end of the connecting rod (11) is installed 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. The 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 has the air inlet channel (321), the flow cavity (3611) and the air outlet channel (311); the peripheral sealing clamp of the auxiliary diaphragm (13) is arranged between the main seat body and the first end of the diaphragm seat (33); the peripheral sealing clamp of the main diaphragm (12) is arranged between the valve cover (34) and the second end of the diaphragm seat (33); and the electromagnetic assembly (4) is installed on the valve cover (34).

9. The gas proportional valve according to claim 8, characterized in that: A valve core seat (35) is detachably installed in the valve installation cavity (36), and the valve core seat (35) has an air flow channel (3511) that passes through the valve shaft (21) in an axial direction. The valve port (354) is formed at one end of the air flow channel (3511) away from the connecting rod (11), and the guide component (352) is arranged in the air flow channel (3511).

10. The 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 component (352) and a connecting portion (353) connected between the outer seat portion (351) and the guide component (352), wherein the outer seat portion (351) is sealingly connected to the cavity wall of the valve installation cavity (36); The outer wall of the valve shaft (21) is provided with a pressing protrusion (212), the elastic member (5) is sleeved on the outside of the guide member (352), and one end of the elastic member (5) is in contact with the connecting portion (353), and the other end of the elastic member (5) is in contact with the pressing protrusion (212).

11. The gas proportional valve according to claim 9, characterized in that: The valve seat assembly (3) comprises an air inlet seat (32) and an air outlet seat (31) which are separately arranged along the axial direction of the valve shaft (21) and are detachably connected, the air outlet seat (31) is provided with the air outlet channel (311), the air inlet seat (32) is provided with the air inlet channel (321), the air inlet seat (32) and the air outlet seat (31) jointly form at least a portion of the valve installation cavity (36), and the valve core seat (35) is sandwiched between the air inlet seat (32) and the air outlet seat (31).

12. A gas equipment, characterized in that: It comprises a gas proportional valve as described in any one of claims 1-11.

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