Gas proportional valve and gas appliance

Abstract

The utility model belongs to valve technical field, specifically discloses a kind of gas proportional valve and gas equipment.Gas proportional valve includes valve seat structure, pilot diaphragm and pilot pressure regulating assembly;Pilot diaphragm is separated to form first air chamber and second air chamber with pilot valve cavity;Pilot regulating assembly includes adjusting piece and integrally formed valve cover, valve seat structure has insert hole, insert hole is coaxially arranged with pilot diaphragm, valve cover is installed in the upside of valve seat structure and lower end is provided with the insert column portion protruding downward, insert column portion is inserted in insert hole and lower end is riveted with valve seat structure, valve cover has the installation cavity coaxially arranged with insert column portion, adjusting piece is installed in installation cavity and abuts to pilot diaphragm, valve cover has the flow restriction tube protruding in the direction of departing from valve seat structure, flow restriction tube is provided with air passage communicated with first air chamber.The utility model can reduce the parts of gas proportional valve, improve the dismounting efficiency of gas proportional valve.

Description

Technical Field

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

[0002] Gas appliances such as gas water heaters and gas wall-hung boilers heat water or other substances by using the heat generated from the combustion of gas. Since gas combustion requires air to assist combustion, the mixing ratio and degree of mixing of gas and air have a significant impact on the stability and completeness of combustion. Therefore, gas appliances are usually equipped with a gas proportional valve to regulate the gas flow.

[0003] A gas proportional valve typically includes a valve body, an electromagnetic module, a proportional control module, and a pilot control assembly. The electromagnetic module, proportional control module, and pilot control assembly are all installed in the valve body. The electromagnetic module is used to control the gas intake on / off. The pilot control assembly is used to adjust the pressure in the back pressure chamber of the proportional control module, thereby regulating the outlet pressure. The proportional control module is used to control the opening degree of the proportional main valve port. The prior art provides a pilot regulating assembly and a gas proportional valve including the pilot regulating assembly. The pilot regulating assembly includes a valve cover, a regulating diaphragm, an regulating screw, and an elastic element. The regulating diaphragm is sandwiched between the valve cover and the valve body, such that a first pressure chamber is formed between the regulating diaphragm and the valve body, and a second pressure chamber is formed between the regulating diaphragm and the valve cover. The valve cover is provided with an regulating hole and an air inlet, and the air inlet is connected to a ventilation pressure pipe. The regulating screw and the elastic element are installed in the regulating hole. The lower end of the elastic element abuts against the upper side of the regulating diaphragm, and the regulating screw abuts against the upper end of the elastic element. By moving the regulating screw in the regulating hole, the force applied by the elastic element to the regulating diaphragm can be adjusted.

[0004] The existing gas proportional valve has a valve cover installed on the valve body and connected to the valve body by screws. The regulating diaphragm is sandwiched between the valve body and the valve cover. The pilot regulating assembly is fixed to the valve cover by screws. The valve cover of the pilot regulating assembly is composed of multiple parts, which affects the disassembly and assembly efficiency of the gas proportional valve. Utility Model Content

[0005] The first technical problem solved by this utility model is to provide a gas proportional valve that can improve the assembly coaxiality and assembly reliability of the gas proportional valve, and improve the insertion efficiency.

[0006] The second technical problem solved by this utility model is to provide a gas equipment that can improve the assembly reliability and usage reliability of the gas equipment.

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

[0008] A gas proportional valve includes a valve seat structure, the valve seat structure having a pilot valve chamber, and the gas proportional valve further includes:

[0009] A pilot diaphragm that divides the pilot valve chamber into a first gas chamber and a second gas chamber;

[0010] A pilot regulating assembly includes an regulating member and an integrally formed valve cover. The valve seat structure has an insertion hole coaxially arranged with the pilot diaphragm. The valve cover is mounted on the upper side of the valve seat structure and has a downwardly protruding insertion post at its lower end. The insertion post is inserted into the insertion hole and its lower end is riveted to the valve seat structure. The valve cover has a mounting cavity coaxially arranged with the insertion post. The regulating member is mounted in the mounting cavity and abuts against the pilot diaphragm. The valve cover has a flow-limiting tube protruding away from the valve seat structure, and an air passage communicating with the first air chamber is provided in the flow-limiting tube.

[0011] Compared with the prior art, the gas proportional valve of this utility model has the following advantages: By setting an insertion hole in the valve seat structure and a plug-in post on the valve cover, the pilot regulating component can be installed and positioned on the valve seat structure through the cooperation of the plug-in post and the insertion hole, improving the assembly convenience and efficiency of the gas proportional valve while ensuring the assembly accuracy of the pilot regulating component on the valve seat structure; since the lower end of the plug-in post is riveted to the valve seat structure, the sealing at the connection between the plug-in post and the valve seat structure can be guaranteed, and the additional sealing structure and connection structure are avoided, reducing the number of parts of the gas proportional valve and reducing the assembly difficulty; furthermore, the valve cover is provided with a plug-in post and a flow limiting tube, and the valve cover is integrally formed, which can effectively reduce the number of parts of the pilot regulating component, reduce the assembly difficulty of the pilot regulating component on the valve seat structure, and thus reduce the number of parts of the gas proportional valve and improve the assembly efficiency of the gas proportional valve.

[0012] In one embodiment, the valve seat structure includes a valve body and a first cover plate that covers the valve body. The valve body and the first cover plate form the pilot valve cavity. The periphery of the pilot diaphragm is sandwiched between the valve body and the first cover plate. The first cover plate has the insertion hole. The valve cover includes a pressure cap portion and a mounting post portion that protrudes from the upper side of the pressure cap portion. The pressure cap portion abuts against the upper side of the first cover plate. The insertion post portion protrudes from the lower side of the pressure cap portion. The flow limiting tube protrudes from the upper side of the pressure cap portion and is spaced apart from the mounting post portion. The mounting cavity penetrates the mounting post portion and the insertion post portion in the vertical direction.

[0013] In one embodiment, an air inlet is provided on the upper side of the first cover plate, which communicates with the first air chamber. A flow-limiting hole is provided on the valve cover. The air channel, the flow-limiting hole, the air inlet, and the first air chamber are connected in sequence. The air passage cross-sectional area of ​​the flow-limiting hole is smaller than the air passage cross-sectional area of ​​the air inlet and the air channel.

[0014] In one embodiment, a sealing groove is provided on the lower side of the valve cover or the upper side of the first cover plate, and an air intake sealing ring is provided in the sealing groove, the air intake sealing ring being arranged around the air intake hole.

[0015] In one embodiment, one of the valve cover and the first cover plate is provided with a positioning hole, and the other is provided with a positioning protrusion, the positioning protrusion being inserted into the positioning hole.

[0016] In one embodiment, the valve body is provided with a proportional valve chamber and an outlet passage. The proportional valve chamber and the outlet passage are connected through an outlet valve port. The gas proportional valve also includes an outlet flow regulating assembly installed on the valve body. The outlet flow regulating assembly includes a flow regulating valve core and a regulating valve rod. The flow regulating valve core is installed on the valve body and cooperates with the outlet valve port. The lower end of the regulating valve rod abuts against the flow regulating valve core. The regulating valve rod can move relative to the valve body in the vertical direction, thereby causing the flow regulating valve core to move and adjust the opening of the outlet valve port.

[0017] In one embodiment, the valve body is provided with an adjustment through hole, the adjustment through hole extends through the upper end of the valve body, and the adjustment valve rod can be sealed and inserted into the adjustment through hole from top to bottom;

[0018] The first cover plate is provided with a stepped hole running through it from top to bottom. The stepped hole includes a small hole and a large hole that are connected from top to bottom. The large hole is coaxially connected with the adjusting through hole, and the diameter of the large hole is greater than or equal to the maximum outer diameter of the adjusting valve stem. The diameter of the small hole is less than the maximum outer diameter of the adjusting valve stem.

[0019] In one embodiment, the first cover plate has an end plate portion that mates with the valve body, the end plate portion having an upwardly protruding stop ring, the end plate portion having the large hole portion, and the inner hole of the stop ring forming the small hole portion.

[0020] In one embodiment, the regulating through hole includes a threaded hole and a mounting hole that are connected in a continuous manner. The regulating valve rod is sealed to the inner wall of the mounting hole and threaded to the inner wall of the threaded hole. A drive groove is provided on the upper end face of the regulating valve rod.

[0021] The second technical problem mentioned above is solved by the following technical solution:

[0022] A gas appliance includes a gas proportional valve as described above.

[0023] Compared with the prior art, the gas equipment described in this utility model has the following advantages: by adopting the above-mentioned gas proportional valve, the assembly reliability and usage reliability of the gas equipment can be improved. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the gas proportional valve provided in an embodiment of the present utility model;

[0025] Figure 2 A schematic diagram showing the disassembled structure of the gas proportional valve provided in an embodiment of this utility model;

[0026] Figure 3 A cross-sectional view of a gas proportional valve provided in an embodiment of this utility model;

[0027] Figure 4 A partial structural cross-sectional view of the gas proportional valve at the pilot regulating assembly provided in an embodiment of this utility model;

[0028] Figure 5 A schematic diagram showing the disassembled structure of the pilot adjustment component provided in an embodiment of this utility model;

[0029] Figure 6 A cross-sectional view of the gas proportional valve provided in an embodiment of this utility model from another section.

[0030] Figure 7 for Figure 6 A magnified view of a section at point I;

[0031] Figure 8 A cross-sectional view of the regulating valve stem and sealing ring provided in an embodiment of this utility model.

[0032] Label Explanation:

[0033] 1. Pilot regulating assembly; 11. Valve cover; 111. Gland; 1111. Flow limiting orifice; 1112. Air outlet; 1113. Positioning hole; 112. Insertion post; 113. Mounting post; 114. Flow limiting tube; 1141. Air passage; 115. Mounting cavity; 12. Adjusting component; 121. Adjusting threaded component; 1211. Receiving groove; 1212. Protruding post; 122. Compression spring; 123. First spring seat; 13. Mounting plug; 131. Sealing head; 132. Tightening head; 14. Mounting sealing ring; 15. Inlet sealing ring;

[0034] 2. Pilot valve core assembly; 21. Pilot diaphragm; 211. Pilot valve core; 212. Diaphragm body; 22. Pilot reset component; 23. Second spring seat;

[0035] 3. Solenoid valve module; 31. First cover plate; 311. End plate; 312. Mounting boss; 313. Stop ring; 314. Air inlet; 315. Positioning protrusion; 316. Stepped hole; 3161. Large hole; 3162. Small hole; 32. First solenoid valve; 33. Second solenoid valve;

[0036] 4. Valve body; 41. Main valve seat; 411. Inlet passage; 412. Outlet passage; 413. Adjustment through hole; 4131. Mounting hole; 4132. Threaded hole; 4133. Flared hole; 414. First on / off valve port; 415. Second on / off valve port; 42. Second cover plate; 43. Pilot valve seat; 431. Pilot valve port;

[0037] 5. Proportional module; 51. Proportional valve core; 52. Proportional diaphragm assembly; 53. Proportional valve seat; 531. Main seat body; 532. Valve core plate; 5321. Air outlet valve port; 54. Proportional valve chamber;

[0038] 6. Outlet flow regulating assembly; 61. Flow regulating valve core; 611. Regulating block; 612. Return spring; 62. Regulating valve stem; 621. Mounting rod; 6211. Sealing groove; 622. Screw; 623. Pressing head; 624. End head; 63. Sealing ring;

[0039] 101. First air chamber; 102. Second air chamber; 103. Back pressure chamber;

[0040] 201. First seal; 202. Second seal. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "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 utility model 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 utility model.

[0043] 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. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] like Figures 1 to 4 As shown, this embodiment provides a gas proportional valve, which includes a valve seat structure, a pilot valve core assembly 2, and a pilot regulating assembly 1. The valve seat structure includes a pilot valve chamber, which is divided by a pilot diaphragm 21 to form a first air chamber 101 and a second air chamber 102. The pilot adjustment assembly 1 includes an adjustment member 12 and an integrally formed valve cover 11. The valve seat structure has an insertion hole, which is coaxially arranged with the pilot diaphragm 21. The valve cover 11 is installed on the upper side of the valve seat structure and has a downward protruding insertion post 112 at its lower end. The insertion post 112 is inserted into the insertion hole and its lower end is riveted to the valve seat structure. The valve cover 11 has a mounting cavity 115 coaxially arranged with the insertion post 112. The adjustment member 12 is installed in the mounting cavity 115 and abuts against the pilot diaphragm 21. The valve cover 11 has a flow limiting tube 114 protruding away from the valve seat structure. An air passage 1141 communicating with the first air chamber 101 is provided in the flow limiting tube 114.

[0046] The gas proportional valve provided in this embodiment, by providing an insertion hole in the valve seat structure and an insertion post 112 on the valve cover 11, allows the pilot regulating component 1 to be installed and positioned on the valve seat structure through the cooperation of the insertion post 112 and the insertion hole. This improves the assembly convenience and efficiency of the gas proportional valve while ensuring the assembly accuracy of the pilot regulating component 1 on the valve seat structure. Since the lower end of the insertion post 112 is riveted to the valve seat structure, the sealing at the connection between the insertion post 112 and the valve seat structure can be guaranteed, and the additional sealing and connection structures are avoided, reducing the number of parts of the gas proportional valve and lowering the assembly difficulty. Furthermore, the valve cover 11 is provided with the insertion post 112 and the flow limiting tube 114, and the valve cover 11 is integrally formed, which can effectively reduce the number of parts of the pilot regulating component 1, reduce the assembly difficulty of the pilot regulating component 1 on the valve seat structure, and thus reduce the number of parts of the gas proportional valve and improve the assembly efficiency of the gas proportional valve.

[0047] In one embodiment, the valve seat structure includes a valve body 4 and a first cover plate 31 that covers the valve body 4. The valve body 4 and the first cover plate 31 surround a pilot valve cavity, and the periphery of the pilot diaphragm 21 is sandwiched between the valve body 4 and the first cover plate 31. This reduces the processing difficulty of the valve seat structure and improves the ease of setting the pilot adjustment component 1.

[0048] The gas proportional valve includes a solenoid valve module 3 and a proportional module 5. The valve body 4 includes a main valve seat 41, which has an intake channel 411, a first valve chamber, a connecting chamber, a second valve chamber, and an outlet channel 412. The intake channel 411 is connected to the first valve chamber. The first valve chamber and the connecting chamber are connected through a switch valve port 414. The connecting chamber and the second valve chamber are connected through two switch valve ports 415. The solenoid valve module 3 is installed on the valve body 4 and includes a solenoid valve 32 and a solenoid valve 33. The valve core of the solenoid valve 32 extends into the first valve chamber and is used to control the opening and closing of the switch valve port 414. The valve core of the solenoid valve 33 extends into the second valve chamber and is used to control the opening and closing of the two switch valve ports 415.

[0049] The main valve seat 41 has a mounting groove on the side opposite to the solenoid valve module 3 that communicates with the connecting cavity. The valve body 4 also includes a second cover plate 42 installed at the opening of the mounting groove. The proportional module 5 includes a proportional valve seat 53 installed in the mounting groove and a proportional diaphragm assembly 52 sandwiched between the main valve seat 41 and the second cover plate 42. The proportional diaphragm assembly 52 and the proportional valve seat 53 enclose a proportional valve cavity 54. The proportional valve seat 53 is provided with a proportional valve port communicating with the proportional valve cavity 54 and the connecting cavity, and an outlet valve port 5321 communicating with the proportional valve cavity 54 and the outlet passage 412. The proportional diaphragm assembly 52 and the second cover plate 42 enclose a back pressure cavity 103. The back pressure cavity 103 communicates with the second air cavity 102 of the pilot valve cavity through a pilot passage. The proportional module 5 also includes a proportional valve core 51 mounted on a proportional valve seat 53. The side of the proportional valve core 51 away from the proportional valve port is connected to the proportional diaphragm assembly 52, so that the proportional valve core 51 can adjust the opening of the proportional valve port with the cooperation of the proportional diaphragm assembly 52. ​​Further, the proportional valve seat 53 includes a main seat body 531 with its opening facing the communicating cavity and a valve core plate 532 detachably connected to the open end of the main seat body 531. Both the proportional valve port and the exhaust valve port 5321 are located on the valve core plate 532. A first sealing element 201 is provided between the valve core plate 532 and the bottom of the mounting groove to ensure a seal at the connection point.

[0050] In one embodiment, the solenoid valve module 3 includes a magnetic guide bracket, on which a primary solenoid valve 32 and a secondary solenoid valve 33 are mounted. The magnetic guide bracket includes the aforementioned first cover plate 31. That is, the first cover plate 31 serves not only as the mounting bracket structure for the pilot regulating component 1 but also as the bracket structure for the solenoid valve module 3 itself, thereby enabling integrated valve seat design, reducing the number of components in the gas proportional valve, and lowering the assembly difficulty of the gas proportional valve. The gas proportional valve also includes a second sealing element 202 sandwiched between the main valve seat 41 and the first cover plate 31. The second sealing element 202 surrounds the valve openings of the first and second valve chambers to achieve a seal at the connection point.

[0051] It is worth noting that the structure of the main valve seat 41, the structure of the proportional module 5, the structure of the solenoid valve module 3, and the cooperation structure between the main valve seat 41 and the proportional module 5 and the solenoid valve module 3 can all be set with reference to existing technology, and this embodiment does not limit or elaborate on them. The principle of the pilot regulating component 1 and the pilot valve core component 2 cooperating with the pilot channel to regulate the pressure of the back pressure chamber 103 is an existing principle, and this embodiment will not elaborate on it.

[0052] The valve body 4 has a pilot mounting groove on the side facing the first cover plate 31. The valve body 4 also includes a pilot valve seat 43 installed in the pilot mounting groove. The pilot valve seat 43 is provided with a pilot valve port 431, which is coaxially arranged with the pilot diaphragm 21. The periphery of the pilot diaphragm 21 is sandwiched between the end of the pilot valve seat 43 and the first cover plate 31. The pilot diaphragm 21 and the pilot valve seat 43 surround and form a second air chamber 102.

[0053] The pilot diaphragm 21 includes a pilot valve core 211 and a diaphragm body 212 connected to the periphery of the pilot valve core 211. The thickness of the pilot valve core 211 at its center is greater than the thickness of the diaphragm body 212. The periphery of the diaphragm body 212 is sandwiched between the pilot valve seat 43 and the first cover plate 31. The pilot valve core assembly 2 also includes a pilot reset member 22 and a second spring seat 23 sleeved on the outside of the pilot valve core 211. The second spring seat 23 is located on the side of the diaphragm body 212 facing the first air chamber 101 and abuts against the adjusting member 12. The pilot reset member 22 is disposed in the second air chamber 102 and its two ends abut against the bottom of the second air chamber 102 and the pilot valve core 211, respectively.

[0054] It is worth noting that the structure of the pilot valve seat 43, the structure of the pilot valve core assembly 2, and the mating structure between the pilot valve core assembly 2 and the pilot valve seat 43 can all be set with reference to the prior art. This is not the focus of this utility model and will not be described in detail here.

[0055] like Figure 4 and Figure 5 As shown, in one embodiment, the valve cover 11 includes a pressure cap portion 111 and a mounting post portion 113 protruding from the upper side of the pressure cap portion 111. A plug-in post portion 112 protrudes from the lower side of the pressure cap portion 111. A flow restrictor tube 114 protrudes from the upper side of the pressure cap portion 111 and is spaced apart from the mounting post portion 113. The mounting cavity 115 extends through the mounting post portion 113 and the plug-in post portion 112 in the vertical direction. The pressure cap portion 111 is disposed on the upper side of the first cover plate 31. By providing the pressure cap portion 111, the ease of fitting between the first cover plate 31 and the valve cover 11 can be improved, and the fitting area can be increased. By providing the mounting post portion 113, the length of the mounting cavity 115 can be guaranteed, thereby ensuring the ease and reliability of installing the adjusting member 12.

[0056] To improve the ease of communication between the air passage 1141 and the first air chamber 101, in one embodiment, an air inlet 314 communicating with the first air chamber 101 is provided on the upper side of the first cover plate 31, and a flow-limiting orifice 1111 is provided on the valve cover 11. The air passage 1141, the flow-limiting orifice 1111, the air inlet 314, and the first air chamber 101 are sequentially connected. The ventilation cross-sectional area of ​​the flow-limiting orifice 1111 is smaller than that of the air inlet 314 and the air passage 1141. This arrangement can control the amount of air entering the first air chamber 101 by setting the flow-limiting orifice 1111. At the same time, it can increase the cross-sectional area of ​​the air passage 1141 when the ventilation cross-sectional area of ​​the flow-limiting orifice 1111 is small, thereby reducing the processing difficulty of the air passage 1141 and improving the ease of connection between the air passage 1141 and the air pressure pipe.

[0057] To ensure reliable communication between the flow restrictor 1111 and the air inlet 314, in one embodiment, a sealing groove is provided on the lower side of the valve cover 11 or the upper side of the first cover plate 31. An air inlet sealing ring 15 is provided in the sealing groove and surrounds the air inlet 314 to seal the communication position between the air inlet 314 and the flow restrictor 1111.

[0058] Specifically, a sealing groove is provided on the lower side of the valve cover 11, and the air inlet sealing ring 15 is pressed between the bottom of the sealing groove and the first cover plate 31 to reduce the processing difficulty of the first cover plate 31. Further, an air outlet 1112 is provided at the bottom of the sealing groove, and the air inlet sealing ring 15 is arranged around the air outlet 1112. The air outlet 1112 is directly opposite to the air inlet 314 and communicates with the lower end of the flow restricting hole 1111. The ventilation cross-sectional area of ​​the air outlet 1112 is larger than the ventilation cross-sectional area of ​​the flow restricting hole 1111. This arrangement allows the air inlet 314 and the air passage 1141 to be eccentrically positioned, ensuring a certain distance between the flow restricting pipe 114 and the center of the mounting cavity 115, while reducing the required mating area between the valve cover 11 and the first cover plate 31.

[0059] In one embodiment, the first cover plate 31 includes an end plate portion 311 that mates with the surface of the valve body 4. The end plate portion 311 has an upwardly protruding mounting boss 312. The valve cover 11 is mounted on the upper side of the mounting boss 312, which has an insertion hole. A recessed groove extending to the mounting boss 312 is formed on the lower side of the first cover plate 31. The groove wall and the pilot diaphragm 21 surround each other to form a first air cavity 101. This arrangement increases the height of the first air cavity 101 by the mounting boss 312, improving the ease of mating between the first cover plate 31 and the pilot diaphragm 21. Simultaneously, the mounting boss 312 also increases the local structural strength and rigidity of the first cover plate 31, enhancing the reliability of the pilot adjustment assembly 1 on the first cover plate 31.

[0060] Furthermore, a positioning groove is provided on the lower side of the first cover plate 31, and the upper end of the pilot valve seat 43 is inserted into the positioning groove to achieve the installation and positioning of the first cover plate 31 and the pilot valve seat 43. A recessed groove is provided at the bottom of the positioning groove.

[0061] One of the valve cover 11 and the first cover plate 31 is provided with a positioning hole 1113, and the other is provided with a positioning protrusion 315. The positioning protrusion 315 is inserted into the positioning hole 1113 to achieve the assembly positioning of the valve cover 11 and the first cover plate 31, thereby improving the assembly efficiency and assembly accuracy of the pilot adjustment component 1 on the first cover plate 31. In one embodiment, the positioning protrusion 315 protrudes from the first cover plate 31, and the positioning hole 1113 is provided on the valve cover 11 and passes through the valve cover 11. This allows for direct observation of the fit between the positioning protrusion 315 and the positioning hole 1113 during assembly, improving assembly efficiency. In other embodiments, the positioning protrusion 315 may be provided on the lower side of the valve cover 11, and the positioning hole 1113 may be provided on the first cover plate 31.

[0062] The positioning hole 1113 is provided in the pressure cap 111 and passes through the pressure cap 111. The positioning hole 1113 and the flow limiting tube 114 are located on opposite sides of the mounting column 113 to avoid structural interference.

[0063] In one embodiment, the adjusting member 12 includes an adjusting threaded member 121 and a pressing spring 122. The cavity wall of the mounting cavity 115 is provided with an internal thread, and the adjusting threaded member 121 is screwed into the mounting cavity 115. The upper end of the pressing spring 122 abuts against the adjusting threaded member 121 and the lower end abuts against the pilot diaphragm 21. Thus, the elastic force applied to the pilot diaphragm 21 by the pressing spring 122 can be adjusted by adjusting the position of the adjusting threaded member 121 in the mounting cavity 115. Further, the lower end of the adjusting threaded member 121 is provided with a receiving groove 1211, and a first spring seat 123 is installed in the receiving groove 1211. The first spring seat 123 has a stepped surface. The upper end of the pressing spring 122 is located in the receiving groove 1211. The pressing spring 122 is sleeved on the outside of the first spring seat 123 and abuts against the stepped surface to press the first spring seat 123 against the bottom of the receiving groove 1211.

[0064] The end of the adjusting threaded component 121 is provided with a slot to facilitate tightening the adjusting threaded component 121 with a screwdriver or other tools, thereby improving the convenience of adjusting the adjusting threaded component 121. The bottom of the receiving groove 1211 is provided with a protruding post 1212, and the upper end of the first spring seat 123 is provided with a pressing groove. The lower end of the protruding post 1212 abuts against the bottom of the pressing groove.

[0065] It is worth noting that the structure of the above-mentioned adjusting member 12 is only an exemplary structure. The existing structures of the adjusting member 12 used in the pilot adjusting assembly 1 can all be applied to this utility model. This utility model is not limited or described in detail.

[0066] The pilot adjustment assembly 1 also includes a mounting plug 13, which is detachably connected to the upper end of the mounting post 113 and can seal the upper opening of the mounting cavity 115 to prevent the adjustment component 12 from being exposed. Specifically, the mounting plug 13 includes a sealing head 131 inserted into the mounting cavity 115 and a screwing head 132 located outside the mounting cavity 115. The screwing head 132 abuts against the upper end of the mounting post 113, and the sealing head 131 is threadedly engaged with the cavity wall of the mounting cavity 115 to improve the installation stability and reliability of the mounting plug 13. A mounting sealing ring 14 is provided between the mounting plug 13 and the mounting post 113 to seal the connection between the mounting post 113 and the mounting plug 13, preventing moisture or impurities from entering the mounting cavity 115.

[0067] like Figure 2 , Figure 3 and Figure 6 As shown, in one embodiment, the gas proportional valve further includes an outlet flow regulating component 6 installed on the valve body 4. The outlet flow regulating component 6 includes a flow regulating valve core 61 and a regulating valve stem 62. The flow regulating valve core 61 is installed on the valve body 4 and cooperates with the gas outlet valve port 5321. The lower end of the regulating valve stem 62 abuts against the flow regulating valve core 61. The regulating valve stem 62 can move relative to the valve body 4 in the vertical direction, thereby actuating the flow regulating valve core 61 and adjusting the opening degree of the gas outlet valve port 5321. By setting the outlet flow regulating component 6, the gas flow rate of the gas outlet channel 412 can be regulated, thereby improving the reliability of the gas proportional valve. At the same time, by adjusting the flow regulating valve core 61 by moving the regulating valve stem 62 up and down to adjust the opening degree of the gas outlet valve port 5321, the ease of adjusting the regulating valve stem 62 can be improved, thereby improving the ease of adjusting the opening degree of the gas outlet valve port 5321 and enhancing the user experience of the gas proportional valve.

[0068] Specifically, the flow regulating valve core 61 includes an adjusting block 611 rotatably mounted on the proportional valve seat 53, with the upper end of the adjusting block 611 extending into the outlet valve port 5321; the flow regulating valve core 61 also includes a return spring 612, the lower end of the return spring 612 acting on the second cover plate 42 and the upper end abutting against the adjusting block 611, the abutting position of the lower end of the regulating valve rod 62 against the adjusting block 611 and the rotation axis of the adjusting block 611 are respectively located on opposite sides of the return spring 612, that is, the regulating valve rod 62 acts on the first side of the adjusting block 611, the second side of the adjusting block 611 is rotatably mounted on the proportional valve seat 53, and the return spring 612 is used to apply an upward force to the adjusting block 611. Therefore, when the regulating valve rod 62 moves downward, the first side of the adjusting block 611 flips downward, thereby increasing the opening of the air outlet 5321; when the regulating valve rod 62 moves upward, the first side of the adjusting block 611 flips upward under the action of the return spring 612, thereby reducing the opening of the air outlet 5321, that is, reducing the air flow rate through the air outlet 5321.

[0069] It is worth noting that the structure of the flow regulating valve core 61 described above is only an exemplary structure. The existing structures of flow regulating valve core 61 that can cooperate with the regulating valve stem 62 to achieve flow regulation of the outlet valve port 5321 can all be applied to this utility model. This utility model does not limit or elaborate on the structure of the flow regulating valve core 61.

[0070] To facilitate the installation and adjustment of the regulating valve stem 62, an adjustment through hole 413 is provided on the valve body 4. The adjustment through hole 413 extends through the upper end of the valve body 4, allowing the regulating valve stem 62 to be inserted into the adjustment through hole 413 from top to bottom, thereby improving the ease of installation and removal of the regulating valve stem 62 on the valve body 4. The adjustment through hole 413 communicates with the connecting cavity, allowing the lower end of the regulating valve stem 62 to extend into the connecting cavity and pass through the air outlet 5321.

[0071] like Figures 6 to 8 As shown, the regulating through hole 413 includes a threaded hole portion 4132 and a mounting hole portion 4131 that are connected. The regulating valve stem 62 is sealed to the inner wall of the mounting hole portion 4131, and the regulating valve stem 62 is threaded to the inner wall of the threaded hole portion 4132. A drive groove is provided on the upper end face of the regulating valve stem 62. Thus, the regulating valve stem 62 can be turned by applying a tool to the drive groove, and then the regulating valve stem 62 is driven to move up and down through the threaded engagement between the regulating valve stem 62 and the threaded hole portion 4132, thereby realizing the adjustment of the regulating valve stem 62 and improving the convenience of adjusting the regulating valve stem 62.

[0072] Furthermore, the regulating valve stem 62 includes a mounting rod portion 621 and a screw portion 622 coaxially connected. The screw portion 622 is located at the upper end of the mounting rod portion 621. The diameter of the mounting hole portion 4131 is larger than the diameter of the threaded hole portion 4132. The mounting rod portion 621 is inserted into the mounting hole portion 4131, and a sealing ring 63 is provided between the mounting rod portion 621 and the hole wall of the mounting hole portion 4131. The screw portion 622 is threaded into the threaded hole portion 4132, and the axial length of the screw portion 622 is greater than the axial length of the threaded hole portion 4132.

[0073] A sealing groove 6211 is provided on the mounting rod 621, and a sealing ring 63 is disposed in the sealing groove 6211 so that the sealing ring 63 moves with the adjusting valve rod 62 when the adjusting valve rod 62 is adjusted, thereby ensuring that there is always a sealing structure between the adjusting valve rod 62 and the wall of the adjusting through hole 413. Preferably, two sealing grooves 6211 are provided at axial intervals, and the sealing ring 63 is provided in a one-to-one correspondence with the sealing groove 6211 to improve the connection and sealing performance of the adjusting valve rod 62 in the adjusting through hole 413.

[0074] The regulating valve stem 62 also includes a pressing head 623 coaxially connected to the lower end of the screw portion 622. The diameter of the pressing head 623 is smaller than the diameter of the screw portion 622. A pressing groove is provided on the upper side of the regulating block 611, and the lower end of the pressing head 623 is inserted into the pressing groove. This arrangement can reduce the size of the pressing groove and the air outlet valve port 5321, improving the structural compactness. The lower end of the pressing head 623 has a tapered structure to improve the convenience of the pressing head 623 entering and exiting the pressing groove.

[0075] The regulating through hole 413 also includes a flared hole 4133 coaxially connected to the upper end of the mounting hole 4131. The diameter of the flared hole 4133 gradually increases from bottom to top, and the flared hole 4133 extends to the end face of the valve body 4. The flared hole 4133 facilitates the guidance of the regulating valve stem 62 into the regulating through hole 413, thereby improving the ease of installation and removal of the regulating valve stem 62 on the valve body 4.

[0076] To further improve the adjustment convenience of the regulating valve stem 62, in one embodiment, the first cover plate 31 is provided with a stepped hole 316. The stepped hole 316 includes a small hole portion 3162 and a large hole portion 3161 connected to the lower end of the small hole portion 3162. The large hole portion 3161 is coaxially connected to the regulating through hole 413, and the diameter of the large hole portion 3161 is greater than or equal to the maximum outer diameter of the regulating valve stem 62, while the diameter of the small hole portion 3162 is less than the maximum outer diameter of the regulating valve stem 62. By providing the stepped hole 316, during the adjustment process of the regulating valve stem 62, the upper end of the regulating valve stem 62 can extend into the large hole 3161 and be restricted from passing through the small hole 3162. This increases the adjustment stroke of the regulating valve stem 62 while keeping other structures unchanged, thus improving the structural compactness. At the same time, by providing the small hole 3162, the regulating valve stem 62 is restricted from passing out of the stepped hole 316, thereby limiting the maximum upward adjustment stroke of the regulating valve stem 62 and preventing the connection structure between the regulating valve stem 62 and the regulating through hole 413 from coming out of the regulating through hole 413. Furthermore, the step hole 316 allows tools to pass through the small hole 3162 to adjust the regulating valve stem 62, improving the convenience of adjustment and increasing the adjustment efficiency.

[0077] Specifically, in the projection plane perpendicular to the regulating valve stem 62, the orthographic projection of the drive groove in the projection plane is located at the orthographic projection of the small hole portion 3162 in the projection plane, so as to improve the convenience of the tool acting on the drive groove through the stepped hole 316.

[0078] Furthermore, the regulating valve stem 62 has a maximum outer diameter at the mounting stem portion 621, which is D1. The diameter of the mounting hole portion 4131 is D2, the diameter of the large hole portion 3161 is D3, and the diameter of the small hole portion 3162 is D4, i.e., D4 < D1 < D3, D1 < D2. Furthermore, D3 ≥ D2.

[0079] The regulating valve stem 62 also includes an end head 624 coaxially connected to the upper part of the mounting rod 621. The end head 624 has a frustum-shaped structure, which is smaller at the top and larger at the bottom, to facilitate insertion of the end head 624 into the large hole 3161. A drive groove is provided at the upper end of the end head 624. Furthermore, the axial length of the end head 624 is greater than or equal to the hole depth of the large hole 3161, so that the mounting rod 621 is always in the regulating through hole 413, ensuring that the sealing ring 63 always seals between the regulating valve stem 62 and the hole wall of the mounting through hole.

[0080] In one embodiment, the end plate portion 311 has an upwardly protruding stop ring 313, and a large hole portion 3161 is provided on the end plate portion 311. The inner hole of the stop ring 313 forms a small hole portion 3162. This allows for an increase in the depth of the stepped hole 316 while maintaining the same thickness of the end plate portion 311, thus meeting the adjustment requirements of the regulating valve stem 62, while simultaneously reducing the material thickness requirement for the end plate portion 311. The hole walls of the large hole portion 3161 and the small hole portion 3162 are connected by a smooth arc transition to prevent the hole walls of the large hole portion 3161 and the small hole portion 3162 from scraping against the end of the regulating valve stem 62.

[0081] It is worth noting that other structures of the gas proportional valve can be set with reference to existing technology, which is not the focus of this utility model and will not be elaborated here.

[0082] This embodiment also provides a gas appliance, including the aforementioned gas proportional valve. The gas appliance can be, but is not limited to, a gas water heater, a gas wall-hung boiler, etc. By employing the aforementioned gas proportional valve, the number of components in the gas appliance can be reduced, and the assembly efficiency of the gas appliance can be improved.

[0083] 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.

[0084] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A gas proportional valve, comprising a valve seat structure, wherein the valve seat structure is provided with a pilot valve chamber, characterized in that, The gas proportional valve also includes: A pilot diaphragm (21) divides the pilot valve chamber into a first gas chamber (101) and a second gas chamber (102). The pilot adjustment assembly (1) includes an adjustment member (12) and an integrally formed valve cover (11). The valve seat structure has an insertion hole, which is coaxially arranged with the pilot diaphragm (21). The valve cover (11) is installed on the upper side of the valve seat structure and has a downward protruding insertion post (112) at its lower end. The insertion post (112) is inserted into the insertion hole and its lower end is riveted to the valve seat structure. The valve cover (11) has an installation cavity (115) coaxially arranged with the insertion post (112). The adjustment member (12) is installed in the installation cavity (115) and abuts against the pilot diaphragm (21). The valve cover (11) has a flow limiting tube (114) protruding away from the valve seat structure. An air passage (1141) communicating with the first air chamber (101) is provided in the flow limiting tube (114).

2. The gas proportional valve according to claim 1, characterized in that, The valve seat structure includes a valve body (4) and a first cover plate (31) covering the valve body (4). The valve body (4) and the first cover plate (31) surround and form the pilot valve cavity. The periphery of the pilot diaphragm (21) is sandwiched between the valve body (4) and the first cover plate (31). The first cover plate (31) has the insertion hole. The valve cover (11) includes a pressure cap portion (111) and a part protruding from the pressure cap portion (111). The mounting post (113) on the upper side of the first cover plate (31) is abutted against the upper side of the cover plate (31). The insertion post (112) protrudes from the lower side of the cover plate (111). The flow limiting tube (114) protrudes from the upper side of the cover plate (111) and is spaced apart from the mounting post (113). The mounting cavity (115) penetrates the mounting post (113) and the insertion post (112) in the vertical direction.

3. The gas proportional valve according to claim 2, characterized in that, An air inlet (314) communicating with the first air chamber (101) is provided on the upper side of the first cover plate (31). A flow limiting hole (1111) is provided on the valve cover (11). The air passage (1141), the flow limiting hole (1111), the air inlet (314) and the first air chamber (101) are connected in sequence. The ventilation cross-sectional area of ​​the flow limiting hole (1111) is smaller than the ventilation cross-sectional area of ​​the air inlet (314) and the air passage (1141).

4. The gas proportional valve according to claim 3, characterized in that, A sealing groove is provided on the lower side of the valve cover (11) or the upper side of the first cover plate (31), and an air inlet sealing ring (15) is provided in the sealing groove. The air inlet sealing ring (15) is arranged around the air inlet hole (314).

5. The gas proportional valve according to claim 2, characterized in that, One of the valve cover (11) and the first cover plate (31) is provided with a positioning hole (1113), and the other is provided with a positioning protrusion (315), which is inserted into the positioning hole (1113).

6. The gas proportional valve according to any one of claims 2-5, characterized in that, The valve body (4) is provided with a proportional valve chamber (54) and an outlet passage (412). The proportional valve chamber (54) and the outlet passage (412) are connected through an outlet valve port (5321). The gas proportional valve also includes an outlet flow regulating component (6) installed on the valve body (4). The outlet flow regulating component (6) includes a flow regulating valve core (61) and a regulating valve rod (62). The flow regulating valve core (61) is installed on the valve body (4) and cooperates with the outlet valve port (5321). The lower end of the regulating valve rod (62) abuts against the flow regulating valve core (61). The regulating valve rod (62) can move relative to the valve body (4) in the vertical direction, so as to cause the flow regulating valve core (61) to move and adjust the opening of the outlet valve port (5321).

7. The gas proportional valve according to claim 6, characterized in that, The valve body (4) is provided with an adjustment through hole (413), which extends through the upper end of the valve body (4), and the adjustment valve rod (62) can be inserted into the adjustment through hole (413) from top to bottom. The first cover plate (31) is provided with a stepped hole (316) running vertically through it. The stepped hole (316) includes a small hole (3162) and a large hole (3161) that are connected vertically. The large hole (3161) is coaxially connected with the regulating through hole (413), and the diameter of the large hole (3161) is greater than or equal to the maximum outer diameter of the regulating valve stem (62). The diameter of the small hole (3162) is smaller than the maximum outer diameter of the regulating valve stem (62).

8. The gas proportional valve according to claim 7, characterized in that, The first cover plate (31) has an end plate portion (311) that cooperates with the valve body (4). The end plate portion (311) has an upwardly protruding stop ring (313). The end plate portion (311) is provided with the large hole portion (3161), and the inner hole of the stop ring (313) forms the small hole portion (3162).

9. The gas proportional valve according to claim 7, characterized in that, The regulating through hole (413) includes a threaded hole (4132) and a mounting hole (4131) that are connected. The regulating valve rod (62) is sealed to the inner wall of the mounting hole (4131). The regulating valve rod (62) is threaded to the inner wall of the threaded hole (4132). A drive groove is provided on the upper end face of the regulating valve rod (62).

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

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