A gas proportional valve and a gas-fired hot water device

Abstract

This utility model belongs to the field of valve technology, specifically disclosing a gas proportional valve and a gas-fired water heating device. The gas proportional valve includes a valve body, an electromagnetic mechanism, a valve shaft, and an adjusting component. The valve body has a valve core module; the electromagnetic mechanism has a central hole and is connected to the valve body; the valve shaft includes a fixed shaft and a moving shaft, the fixed shaft being inserted into the central hole, and the moving shaft being coaxial and slidably inserted into the fixed shaft, one end of the moving shaft abutting against the valve core module; the electromagnetic mechanism drives the moving shaft, and the position of the fixed shaft is adjustable axially relative to the electromagnetic mechanism; the adjusting component is connected to the end of the fixed shaft away from the valve core module and can abut against the end of the moving shaft. This utility model can regulate the outlet pressure, improving the convenience and reliability of pressure regulation, and enhancing the reliability of the 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 a gas-fired hot water equipment. Background Technology

[0002] The gas proportional valve is a core component in gas-fired water heaters that controls the gas flow. To achieve precise control of the valve flow, high-precision proportional valves typically employ a pilot-operated control method. By controlling the pressure output of the pilot stage, the opening of the main valve is controlled, thereby improving the sensitivity and accuracy of pressure regulation.

[0003] The prior art provides a proportional valve including a pilot pressure regulating module, wherein the pilot pressure regulating module is mounted on the valve body of the proportional valve. The pilot pressure regulating module includes an electromagnetic mechanism, a valve seat assembly, a valve shaft, an adjusting component, and a valve core module. The valve seat includes an upper valve seat and a lower valve seat, which together form a pilot valve cavity. The electromagnetic mechanism is mounted on the side of the upper valve seat away from the lower valve seat. The lower valve seat has a pilot inlet channel and a pilot outlet channel. The valve core module includes a pilot valve core and a diaphragm sleeved on the outside of the pilot valve core. The periphery of the diaphragm is sandwiched between the upper and lower valve seats, and the valve core module divides the pilot valve cavity into a balancing air cavity and a regulating valve cavity. The valve shaft includes a fixed shaft and a moving shaft. The fixed shaft is mounted in the central hole of the electromagnetic mechanism. The moving shaft includes a push rod that slides through the fixed shaft and a moving iron core sleeved on the outside of the push rod. The lower end of the push rod is connected to the pilot valve core via a spring. The adjusting element is connected to one end of the fixed shaft and can abut against the end of the moving shaft.

[0004] The pilot pressure regulating module provided by the existing technology can only finely adjust the moving shaft to regulate the secondary pressure at the small end of the proportional valve. When there are manufacturing deviations during the processing of the fixed shaft or the moving shaft, or positional deviations or fitting errors during assembly, the air pressure value output by the pilot pressure regulating module will exceed the tolerance requirements. This will reduce the pressure regulation sensitivity and reliability of the pilot pressure regulating module, and affect the reliable use of the 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 adjustment reliability and flow regulation accuracy of the gas proportional valve.

[0006] The second technical problem solved by this utility model is to provide a gas-fired water heater that can improve the reliability and accuracy of temperature regulation.

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

[0008] A gas proportional valve, comprising:

[0009] The valve body is equipped with a valve core module;

[0010] An electromagnetic mechanism having a central hole is connected to the valve body;

[0011] The valve shaft includes a fixed shaft and a moving shaft. The fixed shaft is inserted into the central hole, and the moving shaft is coaxial with and slidably inserted into the fixed shaft. One end of the moving shaft abuts against the valve core module. The electromagnetic mechanism is used to drive the moving shaft, and the position of the fixed shaft is adjustable relative to the electromagnetic mechanism along the axial direction.

[0012] An adjusting element is connected to the end of the fixed shaft away from the valve core module and is able to abut against the end of the moving shaft.

[0013] Compared with the prior art, the gas proportional valve of this utility model has the following advantages: by adjusting the relative axial position of the fixed shaft and the electromagnetic mechanism, the magnitude of the electromagnetic force exerted by the electromagnetic mechanism on the moving shaft under the same current can be adjusted; at the same time, the axial position of the moving shaft can also be adjusted separately by the adjusting component, which has a dual adjustment function, thereby allowing for a larger adjustment range, so that the gas proportional valve meets the usage requirements, and thus ensures the reliability of the gas proportional valve.

[0014] In one embodiment, the gas proportional valve further includes a locking element connected to the fixed shaft for limiting axial movement of the fixed shaft.

[0015] In one embodiment, the gas proportional valve further includes a valve cover connected to the valve body and located between the valve body and the electromagnetic mechanism, a pilot valve cavity is formed between the valve cover and the valve body, the valve core module is located in the pilot valve cavity, the valve cover has a connecting hole coaxial with the central hole, and the fixed axis extends into the connecting hole and is sealed to the inner wall of the connecting hole.

[0016] In one embodiment, the connecting hole is a threaded hole, and the fixed shaft has a threaded shaft section, which is threaded into the threaded hole.

[0017] In one embodiment, the locking member is located between the valve cover and the electromagnetic mechanism. The locking member is screwed onto the threaded shaft section and abuts against the valve cover. The locking member and the electromagnetic mechanism are spaced apart. An operating port for operating the locking member is provided between the valve cover and the electromagnetic mechanism.

[0018] In one embodiment, the valve cover includes a main valve seat and a support pad. The main valve seat and the end of the electromagnetic mechanism are axially opposite and spaced apart on the valve shaft. The main valve seat is provided with the connecting hole. The support pads are sandwiched between the main valve seat and the electromagnetic mechanism and are arranged in multiple spaced around the valve shaft. The operating port is formed between two adjacent support pads. The locking member abuts against the main valve seat.

[0019] In one embodiment, the support pad and the main valve seat are separately disposed, and the electromagnetic mechanism, the support pad and the main valve seat are connected by fasteners that pass through the three in sequence; the height of the support pad in the axial direction of the valve shaft is greater than the height of the locking member in the axial direction.

[0020] In one embodiment, the threaded shaft segment has a first annular groove, a sealing ring is installed in the first annular groove, and the wall of the connecting hole has a second annular groove, with the sealing ring pressed between the groove wall of the first annular groove and the groove wall of the second annular groove.

[0021] In one embodiment, the fixed shaft includes a fixed iron core and a sleeve, one end of the fixed iron core is inserted into the central hole and the other end is inserted into the sleeve, the end of the sleeve away from the fixed iron core extends out of the electromagnetic mechanism and is connected to the adjusting member, and the fixed iron core has the threaded shaft section;

[0022] The moving shaft includes a valve stem coaxially and slidably inserted into the fixed iron core and a moving iron core fixedly sleeved on the outside of the valve stem. The moving iron core is located inside the sleeve and on the side of the fixed iron core away from the valve core module. The moving iron core and the fixed iron core are spaced apart.

[0023] The second technical problem mentioned above is solved by the following technical solution:

[0024] A gas-fired water heater includes a gas proportional valve as described above.

[0025] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: by adopting the above-mentioned gas proportional valve, the accuracy and reliability of water temperature regulation of the gas-fired water heater can be improved, thereby enhancing the user experience of the gas-fired water heater. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the gas proportional valve provided in an embodiment of the present utility model;

[0027] Figure 2 A cross-sectional view of a gas proportional valve provided in an embodiment of this utility model;

[0028] Figure 3This is a schematic diagram of the pilot voltage regulating module provided in an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the disassembled structure of the pilot voltage regulating module provided in an embodiment of the present utility model;

[0030] Figure 5 A cross-sectional view of the pilot voltage regulating module provided in an embodiment of this utility model;

[0031] Figure 6 for Figure 5 A magnified view of a section at point I;

[0032] Figure 7 This is a schematic diagram of the structure of the fixed iron core provided in an embodiment of the present utility model.

[0033] Label Explanation:

[0034] 100, Pilot pressure regulating module; 200, Valve body; 300, Pilot valve chamber;

[0035] 1. Valve cover; 11. Main valve seat; 111. Connecting hole; 112. Bottom groove; 12. Support pad;

[0036] 2. Fixed shaft; 21. Fixed iron core; 211. Threaded shaft section; 2111. First annular groove; 212. Main shaft section; 2121. Top groove; 2122. Side groove; 22. Sleeve;

[0037] 3. Moving shaft; 31. Moving iron core; 311. Iron core body; 312. Mating part; 32. Valve stem; 321. Main rod section; 322. Connecting rod section; 323. Insertion rod section; 324. Spherical part; 325. Transition rod section; 33. Limiting component;

[0038] 4. Electromagnetic mechanism; 41. Coil assembly; 42. Magnetic guide frame; 421. First end plate; 422. Second end plate; 423. Side connecting plate; 424. Protruding ring; 425. Fixing lug;

[0039] 5. Locking components;

[0040] 6. Adjusting component; 61. Adjusting sleeve; 611. Mounting sleeve; 612. Limiting ring; 6121. Limiting hole; 613. Operating head; 62. Main adjusting component; 621. Adjusting shaft; 622. Tightening head; 6221. Tool groove;

[0041] 7. Valve core module; 71. Pilot valve core; 711. Valve core body; 712. Cone section; 713. Retaining ring section; 72. Pilot pressure regulating diaphragm;

[0042] 8. Elastic component; 81. Elastic element; 82. First spring seat; 821. Boss portion; 8211. First frustum portion; 8212. Second frustum portion; 822. Abutting edge portion; 823. Spherical groove; 83. Second spring seat; 831. Insertion sleeve portion; 832. Pressing ring portion; 833. Insertion groove; 8331. Large groove portion; 8332. Small groove portion;

[0043] 10. Sealing ring; 20. First guide ring; 30. Second guide ring; 40. Receiving cavity; 50. Operating port. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] This embodiment provides a gas proportional valve that can improve the adjustment efficiency and convenience of the gas proportional valve, and enhance the accuracy of its use.

[0049] like Figures 1 to 5As shown, the gas proportional valve includes a valve body 200, an electromagnetic mechanism 4, a valve shaft, and an adjusting component 6. The valve body 200 has a valve core module 7; the electromagnetic mechanism 4 has a central hole and is connected to the valve body 200; the valve shaft includes a fixed shaft 2 and a moving shaft 3, with the fixed shaft 2 inserted into the central hole and the moving shaft 3 coaxially and slidably inserted into the fixed shaft 2, one end of which abuts against the valve core module 7; the electromagnetic mechanism 4 drives the moving shaft 3, and the position of the fixed shaft 2 is adjustable axially relative to the electromagnetic mechanism 4; the adjusting component 6 is connected to the end of the fixed shaft 2 away from the valve core module 7 and can abut against the end of the moving shaft 3.

[0050] The gas proportional valve provided in this embodiment can adjust the magnitude of the electromagnetic force exerted by the electromagnetic mechanism 4 on the moving shaft 3 under the same current by adjusting the relative axial position of the fixed shaft 2 and the electromagnetic mechanism 4. At the same time, the axial position of the moving shaft 3 can also be adjusted separately by the adjusting component 6, which has a dual adjustment function and thus can have a larger adjustment range, so that the gas proportional valve can meet the usage requirements and thus ensure the reliability of the gas proportional valve.

[0051] In one embodiment, the gas proportional valve further includes a locking element 5, which is connected to the fixed shaft 2 and is used to restrict the axial movement of the fixed shaft 2. That is, when the fixed shaft 2 needs to be adjusted, the locking element 5 is released, allowing the fixed shaft 2 to move axially relative to the electromagnetic mechanism 4. Then, by adjusting the relative axial position of the fixed shaft 2 and the electromagnetic mechanism 4, the magnitude of the electromagnetic force exerted by the electromagnetic mechanism 4 on the moving shaft 3 under the same current can be adjusted. After adjustment, the fixed shaft 2 is fixed by the locking element 5, ensuring the structural stability of the gas proportional valve after adjustment, thereby ensuring the reliability of the gas proportional valve in use.

[0052] In one embodiment, the gas proportional valve further includes a valve cover 1, which is connected to the valve body 200 and located between the valve body 200 and the electromagnetic mechanism 4. A pilot valve cavity 300 is formed between the valve cover 1 and the valve body 200. The valve core module 7 is located within the pilot valve cavity 300. The valve cover 1 has a connecting hole 111 coaxial with the central hole. A fixed shaft 2 extends into the connecting hole 111 and is sealed to the inner wall of the connecting hole 111. That is, the valve cover 1, the electromagnetic mechanism 4, the adjusting component 6, the valve shaft, and the valve core module 7 cooperate to form a pilot pressure regulating module 100, realizing the pilot pressure regulating function of the gas proportional valve.

[0053] It is worth noting that the cooperation structure between the pilot pressure regulating module 100 and the valve body 200, as well as the other structures of the gas proportional valve except for the pilot pressure regulating module 100, can be set with reference to the prior art. This is not the focus of this utility model, and this embodiment does not limit or elaborate on it.

[0054] like Figures 3 to 5As shown, the electromagnetic mechanism 4 includes a coil assembly 41 and a magnetic guide frame 42 surrounding the outside of the coil assembly 41. The magnetic guide frame 42 includes a first end plate 421 and a second end plate 422 arranged opposite each other along the axial direction, and a side connecting plate 423 connecting the first end plate 421 and the second end plate 422. The first end plate 421 and the second end plate 422 are respectively located at both ends of the coil assembly 41 along the axial direction, and the side connecting plate 423 is located on the side of the coil assembly 41. The valve cover 1 is installed on the side of the first end plate 421 away from the coil assembly 41.

[0055] In one embodiment, the connecting hole 111 is a threaded hole, and the fixed shaft 2 has a threaded shaft section 211, which is screwed into the threaded hole. Since the threaded shaft section 211 is screwed into the connecting hole 111, the fitting length between the threaded shaft section 211 and the threaded hole can be adjusted by rotating the fixed shaft 2, thereby realizing the axial position adjustment of the fixed shaft 2, improving the convenience and reliability of adjustment, and facilitating the control of the axial adjustment amount of the fixed shaft 2, while also improving the structural stability after adjustment.

[0056] To improve the convenience of adjustment, in one embodiment, the locking member 5 is located between the valve cover 1 and the electromagnetic mechanism 4. The locking member 5 is screwed onto the threaded shaft section 211 and abuts against the valve cover 1, with the locking member 5 and the electromagnetic mechanism 4 spaced apart. An operating port 50 for operating the locking member 5 is provided between the valve cover 1 and the electromagnetic mechanism 4. With this arrangement, when the fixed shaft 2 needs to be adjusted, the fixed shaft 2 can be rotated first to adjust the axial position of the locking member 5, the fixed shaft 2, and the moving shaft 3 relative to the electromagnetic mechanism 4. Then, the locking member 5 is rotated to move axially relative to the fixed shaft 2 until it abuts against the valve cover 1, thus keeping the positions of the locking member 5, the fixed shaft 2, and the valve cover 1 fixed and locking the fixed shaft 2. The rotation adjustment of the locking member 5 through the operating port 50 can effectively improve the convenience of adjustment, thereby effectively improving the efficiency of adjustment and maintenance, reducing adjustment costs, and improving the reliability and pressure regulation accuracy of the gas proportional valve.

[0057] Furthermore, the valve cover 1 and the end of the electromagnetic mechanism 4 are surrounded to form a receiving cavity 40 and an operating port 50. The operating port 50 penetrates the outer side wall of the valve cover 1, and the locking member 5 is located in the receiving cavity 40 and can be exposed through the operating port 50.

[0058] In another embodiment, the fixed shaft 2 is interference-fitted into the connecting hole 111, and the locking member 5 can be any other structure that can be interference-fitted onto the valve shaft, such as a sleeve 22, or any other structure that can lock the fixed shaft 2 after adjustment.

[0059] In one embodiment, the valve cover 1 includes a separate main valve seat 11 and support pads 12. The main valve seat 11 is positioned opposite and spaced apart from the electromagnetic mechanism 4, and the main valve seat 11 has a connecting hole 111. Multiple support pads 12 are spaced apart and sandwiched between the main valve seat 11 and the electromagnetic mechanism 4, surrounding the valve shaft. The ends of the main valve seat 11, the electromagnetic mechanism 4, and the multiple support pads 12 form a receiving cavity 40. An operating port 50 is formed between two adjacent support pads 12. A locking member 5 is connected to the main valve seat 11. By providing support pads 12, the height of the receiving cavity 40 can be adjusted by setting the height of the support pads 12, while ensuring the structure of the main valve seat 11 remains unchanged, thus reducing the processing difficulty and cost of the valve cover 1. In other embodiments, the support pads 12 and the main valve seat 11 can also be integrally formed structural components.

[0060] In one embodiment, the support pad 12 and the main valve seat 11 are separately disposed, and the electromagnetic mechanism 4, the support pad 12, and the main valve seat 11 are connected by fasteners that pass through them in sequence, with each fastener corresponding to a different support pad 12. This helps to ensure the connection stability and reliability of the main valve seat 11, the electromagnetic mechanism 4, and the support pad 12, and simplifies the connection structure and reduces assembly difficulty. In other embodiments, the support pad 12 can be welded, snap-fitted, or screwed to the main valve seat 11, and the valve cover 1 and the electromagnetic mechanism 4 can also be connected by other methods.

[0061] To improve the ease of connection between the electromagnetic mechanism 4 and the valve cover 1, the first end plate 421 is provided with multiple fixing ears 425 protruding outward. These fixing ears 425 surround the coil assembly 41, and each fixing ear 425 corresponds to a support pad 12. Fasteners pass through the fixing ears 425 to secure the first end plate 421, the support pad 12, and the main valve seat 11, preventing interference between the fasteners and the coil assembly 41. In one embodiment, the fasteners preferably include bolts and nuts to improve the reliability and stability of the fastening.

[0062] In one embodiment, the first end plate 421 has a rectangular structure, and a fixing lug 425 protrudes outward from one of its triangular portions. The fixing lug 425 corresponds to the support pad 12 and is connected to the support pad 12. This arrangement ensures the stability and reliability of the connection between the magnetic guide frame 42 and the valve cover 1, while allowing a wider operating opening 50 to be formed between the two support pads 12 located diagonally, improving the convenience of operation. Specifically, fasteners pass through the fixing lug 425, the support pad 12, and the main valve seat 11 in sequence to secure the three components.

[0063] The support pad 12 is higher along the valve shaft axis than the locking member 5 along the axial direction to improve the smoothness and convenience of adjustment, and also to provide sufficient operating space for the adjustment tool, thus improving the convenience of adjustment.

[0064] In one embodiment, the locking element 5 is preferably a locking nut, which facilitates adjustment by using tools such as wrenches, thus improving the convenience of adjustment. In other embodiments, the locking element 5 includes a threaded sleeve screwed onto the fixed shaft 2 and an adjusting handle portion protruding radially from the threaded sleeve. The adjusting handle portion passes through the operating port 50, allowing the user to adjust the locking element 5 by means of the adjusting handle portion.

[0065] A bottom groove 112 is provided on the side of the valve cover 1 away from the electromagnetic mechanism 4, and the connecting hole 111 passes through the bottom of the bottom groove 112. The bottom groove 112 is provided to allow for a certain gap between the valve cover 1 and the valve core module 7 in the axial direction, thereby facilitating the fit between the valve cover 1 and the valve body 200 and the valve core module 7, improving the ease of installation of the pilot pressure regulating module 100 on the valve body 200. At the same time, the bottom groove 112 can accommodate part of the moving shaft 3, thereby improving the structural stability of the pilot pressure regulating module 100. Specifically, the bottom groove 112 is provided on the main valve seat 11.

[0066] like Figure 5 and Figure 7 As shown, in one embodiment, a sealing ring 10 is provided between the threaded shaft section 211 and the hole wall of the connecting hole 111 to seal the connection position between the valve cover 1 and the fixed shaft 2. To improve the ease of installation of the sealing ring 10, in one embodiment, a first annular groove 2111 is provided on the outer wall of the threaded shaft section 211, and the first annular groove 2111 surrounds the fixed shaft 2; a second annular groove is provided on the hole wall of the connecting hole 111, and the first annular groove 2111 and the second annular groove cooperate to form an annular sealing groove, and the sealing ring 10 is installed in the annular sealing groove, that is, the sealing ring 10 is pressed between the groove wall of the first annular groove 2111 and the groove wall of the second annular groove.

[0067] Furthermore, the axial height of the first annular groove 2111 is equal to the axial dimension of the sealing ring 10, so that the sealing ring 10 can always be securely fitted within the first annular groove 2111. The second annular groove extends axially through the side of the main valve seat 11 away from the valve core module 7, so that the second annular groove has space for the sealing ring 10 to move axially, which facilitates the installation of the fixed shaft 2 on the valve cover 1.

[0068] In one embodiment, the fixed shaft 2 includes a fixed iron core 21 and a sleeve 22. One end of the fixed iron core 21 is inserted into a central hole and the other end is inserted into the sleeve 22. The end of the sleeve 22 away from the fixed iron core 21 extends out of the electromagnetic mechanism 4 and is connected to the adjusting member 6. The fixed iron core 21 has a threaded shaft section 211. The moving shaft 3 includes a valve stem 32 coaxially and slidably inserted into the fixed iron core 21 and a moving iron core 31 fixedly sleeved on the outside of the valve stem 32. The moving iron core 31 is located inside the sleeve 22 and on the side of the fixed iron core 21 away from the valve core module 7. The moving iron core 31 and the fixed iron core 21 are spaced apart. By setting the fixed iron core 21 and the sleeve 22 to cooperate to form the fixed shaft 2, the cooperation and installation convenience of the fixed iron core 21 and the moving iron core 31 can be improved, and it is also beneficial to realize the installation of the adjusting member 6 through the sleeve 22, thereby reducing the cost of the fixed shaft 2 and the moving shaft 3.

[0069] Furthermore, the second end plate 422 has a through hole for the sleeve 22 to pass through. The edge of the through hole is folded in a direction away from the first end plate 421 to form a raised ring 424. The raised ring 424 slides with the sleeve 22 to improve the reliability of the sleeve 22 sliding. The sleeve 22 is preferably a copper sleeve.

[0070] To improve the reliability of the fit between the sleeve 22 and the fixed core 21, the fixed core 21 includes a main shaft section 212 coaxially connected to the threaded shaft section 211. The outer diameter of the main shaft section 212 is smaller than the outer diameter of the threaded shaft section 211, so that a limiting step surface is formed at the connection position of the threaded shaft section 211 and the main shaft section 212. The sleeve 22 is sleeved on the main shaft section 212, and the end of the sleeve 22 abuts against the limiting step surface to provide positioning for the installation of the sleeve 22 and the fixed core 21. In one embodiment, the sleeve 22 and the main shaft section 212 are interference-fitted to improve the stability and reliability of their connection. In other embodiments, the sleeve 22 and the main shaft section 212 can be connected by riveting, threaded connection, or other methods.

[0071] Furthermore, multiple side grooves 2122 are provided axially on the outer wall of the main shaft section 212. The multiple side grooves 2122 are spaced apart circumferentially along the main shaft section 212, and a rib is formed between two adjacent side grooves 2122. The rib abuts against the inner wall of the sleeve 22. This arrangement can enhance the tightness of the fit between the sleeve 22 and the fixed iron core 21.

[0072] In one embodiment, the adjusting member 6 includes an adjusting sleeve 61 and an adjusting main member 62. The adjusting sleeve 61 is installed at the end of the sleeve 22 away from the fixed iron core 21 and is screwed into the sleeve 22. The adjusting main member 62 is screwed into the adjusting sleeve 61. This allows the adjusting sleeve 61 to adjust its axial position relative to the sleeve 22, and the adjusting main member 62 to adjust its axial position relative to the adjusting sleeve 61, thereby improving the adjustment flexibility.

[0073] The inner side of the adjusting sleeve 61 is provided with a limiting hole 6121. The adjusting main component 62 is coaxially mounted on the adjusting sleeve 61 and spaced apart on the side away from the valve core module 7 of the limiting hole 6121. The valve stem 32 is provided with a protruding limiting component 33. The valve stem 32 passes through the limiting hole 6121. The limiting component 33 is located between the limiting hole 6121 and the adjusting main component 62 and is restricted from passing through the limiting hole 6121. When the adjusting main component 62 abuts against the valve stem 32, the limiting component 33 and the limiting hole 6121 are spaced apart in the axial direction of the valve stem 32. This configuration ensures that when the moving shaft 3 floats axially, the contact between the limiting member 33 and the adjusting sleeve 61 limits the movement of the moving shaft 3 towards the valve core module 7, and the contact between the end of the valve stem 32 and the adjusting main member 62 limits the movement of the moving shaft 3 away from the valve core module 7. This better ensures that the axial floating of the moving shaft 3 is within the set stroke range, thus guaranteeing the pressure regulation reliability of the pilot pressure regulating module 100.

[0074] To improve the ease of setting the limiting member 33, the valve stem 32 includes a main stem section 321 that is slidably inserted into the fixed iron core 21, a moving iron core 31 that is sleeved on the outside of the main stem section 321, and a connecting rod section 322 that is coaxially connected to the end of the main stem section 321 away from the valve core module 7. The outer diameter of the connecting rod section 322 is smaller than the outer diameter of the main stem section 321. A positioning step surface is formed between the main stem section 321 and the connecting rod section 322. The limiting member 33 is sleeved on the main stem section 321 and connected to the positioning step surface. The limiting member 33 can be interference-fitted onto the connecting rod section 322 or screwed onto the connecting rod section 322.

[0075] The inner wall of the sleeve 22, away from the fixed iron core 21, has an internal thread, and the outer wall of the adjusting sleeve 61 has an external thread. The adjusting sleeve 61 is screwed onto the inner side of the sleeve 22 to ensure the ease and stability of installation of the adjusting sleeve 61 on the sleeve 22. Simultaneously, this design allows for adjustment of the axial position of the adjusting sleeve 61 on the sleeve 22, further improving the reliability of the gas proportional valve. Furthermore, the inner wall of the adjusting sleeve 61 is screwed into the outer wall of the adjusting main component 62 to improve the connection stability and adjustment convenience of the adjusting main component 62.

[0076] In one embodiment, the adjusting sleeve 61 includes a mounting sleeve portion 611, which is coaxially connected to the sleeve 22. A limiting ring portion 612 protrudes from the inner wall of the mounting sleeve portion 611, and the inner hole of the limiting ring portion 612 forms a limiting hole 6121. The limiting ring portion 612 and the adjusting main member 62 are spaced apart to form a limiting space, and the inner diameter of the limiting ring portion 612 is smaller than the maximum outer diameter of the limiting member 33. Further, the outer wall of the adjusting sleeve 61 is provided with external threads to engage with the internal threads of the inner wall of the sleeve 22.

[0077] To improve the ease of turning the adjusting sleeve 61, the adjusting sleeve 61 also includes an operating head 613 connected to the side of the mounting sleeve 611 away from the valve core module 7. The operating head 613 is located outside the sleeve 22 and has an operating surface on its outer wall, so as to facilitate the user to operate the adjusting sleeve 61 by turning it with a tool. Furthermore, the operating head 613 has a hexahedral structure to cooperate with a wrench.

[0078] The adjusting main component 62 includes an adjusting shaft 621 and a screwing head 622 connected to the end of the adjusting shaft 621. The outer peripheral wall of the adjusting shaft 621 is provided with external threads. The adjusting shaft 621 is screwed into the adjusting sleeve 61, and the screwing head 622 protrudes from the adjusting sleeve 61 to facilitate the screwing operation of the adjusting main component 62. The screwing head 622 preferably adopts a nut head structure to facilitate screwing operation with a wrench. Furthermore, the end face of the screwing head 622 is also provided with a cross-shaped or straight groove 6221 so that the adjusting main component 62 can be used with a screwdriver.

[0079] In one embodiment, the valve stem 32 has a threaded section, and the inner wall of the moving iron core 31 is provided with an internal thread. The moving iron core 31 is screwed onto the threaded section so that the position of the moving iron core 31 on the valve stem 32 can be adjusted, thereby adjusting the axial distance between the moving iron core 31 and the fixed iron core 21, and further improving the reliability of the pilot pressure regulating module 100.

[0080] It is worth noting that the position adjustment of the moving iron core 31 on the valve stem 32 is usually performed during the assembly process of the pilot pressure regulating module 100 based on design parameters and machining errors. This ensures that the pilot pressure regulating module 100 is assembled and regulated according to the design parameters, giving it a certain pressure regulating accuracy. After the pilot pressure regulating module 100 is assembled and tested, especially after it is installed on the valve body 200, the position of the moving iron core 31 on the valve stem 32 is no longer adjusted. Instead, the position of the moving iron core 31 can be finely adjusted through the cooperation between the moving iron core 31 and the locking element 5. This allows for fine adjustment of the axial distance between the moving iron core 31 and the fixed iron core 21, as well as the relative position between the moving iron core 31 and the electromagnetic mechanism 4, to better meet the pressure regulating requirements and ensure the stability of the pressure regulation. That is, the adjustment of the moving iron core 31 on the valve stem 32 has a larger adjustment stroke, which better meets the needs of coarse adjustment, while the cooperation between the locking part 5 and the fixed iron core 21 can better meet the needs of fine adjustment, so as to achieve higher control accuracy.

[0081] In one embodiment, a top groove 2121 is provided on the side of the fixed iron core 21 away from the valve core module 7. The moving iron core 31 includes an iron core body 311 and a mating part 312 connected to the end of the iron core body 311 facing the valve core module 7. The outer diameter of the mating part 312 is smaller than the diameter of the top groove 2121, and the outer diameter of the iron core body 311 is larger than the outer diameter of the iron core body 311. The mating part 312 is inserted into the top groove 2121 and is spaced apart from the groove wall of the top groove 2121.

[0082] It is worth noting that there is an axial distance 'a' between the bottom of the top groove 2121 and the end of the mating part 312, and a radial distance 'b' between the axial groove wall of the top groove 2121 and the mating part 312 on the moving shaft 3. Both 'a' and 'b' can affect the electromagnetic force acting on the moving shaft 3 when the electromagnetic mechanism 4 is energized. Generally speaking, the smaller the size of 'a' or 'b', the smaller the magnetic gap between the moving iron core 31 and the fixed iron core 21, the greater the thrust generated by the electromagnetic mechanism 4 on the moving shaft 3 when the same current is applied, and the greater the outlet pressure.

[0083] In one embodiment, the pilot pressure regulating module 100 further includes a first guide ring 20, which is installed inside the adjusting sleeve 61 and located below the limiting hole 6121. The first guide ring 20 has a first guide hole, and the valve stem 32 is slidably inserted into the first guide hole to guide the axial movement of the valve stem 32. The pilot pressure regulating module 100 also includes a second guide ring 30, which is installed inside the fixed iron core 21 and has a second guide hole, in which the valve stem 32 is slidably inserted. Thus, through the cooperation of the first guide ring 20 and the second guide ring 30, the valve stem 32 has two guiding engagement positions, thereby better ensuring the reliability of the axial movement of the valve stem 32, i.e., ensuring the reliability of the axial floating of the moving shaft 3. In other embodiments, only the first guide ring 20 or only the second guide ring 30 may be provided.

[0084] Specifically, the first guide ring 20 includes a mounting ring portion and a guide ring portion. The mounting ring portion is interference-inserted into the inner side of the adjusting sleeve 61 portion and abuts against the side of the limiting ring portion 612 away from the limiting member 33. The guide ring portion is coaxially connected to the inner wall of the mounting ring portion, and the inner hole of the guide ring portion forms the first guide hole.

[0085] To improve the ease of installation of the second guide ring 30, the fixed iron core 21 has a receiving groove on the side facing the valve core module 7, and an installation groove is formed at the bottom of the receiving groove. The diameter of the receiving groove is larger than the diameter of the installation groove, and the second guide ring 30 is embedded in the installation groove.

[0086] like Figure 5 and Figure 6As shown, the valve core module 7 includes a pilot valve core 71 and a pilot pressure regulating diaphragm 72 sleeved on the outside of the pilot valve core 71. The periphery of the pilot pressure regulating module 100 is sandwiched between the valve cover 1 and the valve body 200. In one embodiment, the pilot pressure regulating module 100 further includes an elastic component 8, which includes an elastic element 81. The elastic element 81 extends axially along the moving shaft 3, with its first end sleeved on the outside of the moving shaft 3 and its second end pressing against the pilot valve core 71. By setting the elastic element 81, the moving shaft 3 and the pilot valve core 71 interact through the elastic element 81, avoiding the problems of high noise and unstable contact caused by hard contact between the two, effectively improving the floating stability and reliability of the moving shaft 3 and the valve core module 7. At the same time, this setting can increase the force range acting on the pilot valve core 71 while keeping the outer diameter of the valve stem 32 unchanged, thereby making the force on the valve core module 7 more stable and the floating more reliable, thus improving the pressure regulating reliability.

[0087] To improve the ease of installation of the elastic element 81, in one embodiment, the elastic component 8 further includes a first spring seat 82 and a second spring seat 83. The first spring seat 82 is disposed on the side of the pilot valve core 71 facing the electromagnetic mechanism 4, and the second end of the elastic element 81 is sleeved on the first spring seat 82. The second spring seat 83 is sleeved on the outer side of the end of the valve stem 32 facing the valve core module 7 and has a radially protruding abutment ring portion 832. The first end of the elastic element 81 is sleeved on the second spring seat 83 and its end abuts against the abutment ring portion 832. By providing the first spring seat 82 and the second spring seat 83, the ease of installation of the elastic element 81 can be improved, which helps to ensure that the first end of the elastic element 81 is axially fixed relative to the moving shaft 3, while avoiding direct contact between the second end of the elastic element 81 and the pilot valve core 71, thus preventing wear.

[0088] In another embodiment, a pressing protrusion may be provided on the outer side wall of the valve stem 32, and the first section of the elastic member 81 may be directly sleeved on the outer side of the valve stem 32 and abut against the pressing protrusion. In yet another embodiment, a boss may be provided directly on the side of the pilot valve core 71 facing the electromagnetic mechanism 4, and the second end of the elastic member 81 may be sleeved on the boss.

[0089] In one embodiment, the valve stem 32 includes a plug-in rod section 323 connected to the main stem section 321 and a spherical portion 324 connected to a section of the plug-in rod section 323 away from the main stem section 321. The second spring seat 83 has a plug-in groove 833 on the side away from the valve core module 7. The plug-in groove 833 includes a large groove 8331 and a small groove 8332 that are connected. The large groove 8331 is located on the side of the small groove 8332 facing the valve core module 7. The groove diameter of the small groove 8332 is smaller than the groove diameter of the large groove 8331 and larger than the groove diameter of the plug-in rod section 323. The groove diameter of the small groove 8332 is slightly smaller than the ball diameter of the spherical portion 324, and the groove diameter of the large groove 8331 is larger than the ball diameter of the spherical portion 324. The spherical portion 324 is inserted into the large groove 8331 by pressing the groove wall of the small groove 8332 and is confined in the large groove 8331, while the insertion rod section 323 is inserted into the small groove 8332. This arrangement improves the ease of assembly between the valve stem 32 and the second spring seat 83.

[0090] Furthermore, the second spring seat 83 includes a plug sleeve portion 831 that is open at one end and closed at the other end. The open end of the plug sleeve portion 831 is provided with a pressing ring portion 832 protruding outward, and the inner cavity of the plug sleeve portion 831 forms a plug groove 833.

[0091] Furthermore, the valve stem 32 also includes a transition section 325 coaxially connected between the insertion rod section 323 and the main rod section 321. The outer diameter of the transition section 325 increases from the insertion rod section 323 to the main rod section 321, so that the outer diameter of the valve stem 32 gradually transitions at the transition section 325, avoiding stress concentration. The groove opening of the small groove 8332 is chamfered to facilitate the insertion of the ball part 324 into the insertion groove 833.

[0092] In one embodiment, the pilot valve core 71 includes a valve core body 711, and a pilot pressure regulating diaphragm 72 is sleeved on the valve core body 711. A tapered portion 712 protrudes from the side of the valve core body 711 facing the moving shaft 3, and the tapered portion 712 is coaxially arranged with the valve core body 711. A spherical groove 823 is provided on the side of the first spring seat 82 away from the electromagnetic mechanism 4. The groove wall of the spherical groove 823 is a spherical surface coaxially arranged with the valve core body 711. Both the spherical groove 823 and the tapered portion 712 are coaxially arranged with the moving shaft 3. The first spring seat 82 is sleeved on the outside of the truncated cone, and the end of the tapered portion 712 abuts against the groove wall of the spherical groove 823. This configuration allows for self-balancing of the force on the first spring seat 82 through the cooperation of the cone 712 and the spherical groove 823, better ensuring the stability and reliability of the force applied by the elastic element 81 to the pilot valve core 71 through the first spring seat 82. At the same time, this configuration can reduce the friction between the first spring seat 82 and the pilot valve core 71, making the force applied by the elastic element 81 more evenly applied to the pilot valve core 71, and preventing the pilot valve core 71 from deflecting due to unbalanced force.

[0093] To improve the reliability of the fit between the first spring seat 82 and the elastic member 81, the first spring seat 82 includes a boss portion 821. The boss portion 821 extends outward from the side near the valve core module 7 and has an abutting edge portion 822. The second end of the elastic member 81 is sleeved on the boss portion 821 and abuts against the abutting edge portion 822 to limit the position of the two in the axial direction and improve the ease of fit between the elastic member 81 and the first spring seat 82.

[0094] The boss portion 821 includes a first frustum portion 8211 and a second frustum portion 8212 coaxially connected. The second frustum portion 8212 is located on the side of the first frustum portion 8211 facing the valve core module 7. The outer diameter of the first frustum portion 8211 gradually decreases in the direction away from the valve core module 7, and the outer diameter of the second frustum portion 8212 gradually increases in the direction towards the valve core module 7. This makes the boss portion 821 have the maximum outer diameter at the connection position of the first frustum portion 8211 and the second frustum portion 8212. The end of the second end of the elastic member 81 is sleeved on the second frustum portion 8212 so that the connection position of the first frustum portion 8211 and the second frustum portion 8212 can restrict the elastic member 81 from dislodging from the boss portion 821, thereby improving the connection stability and reliability of the elastic member 81 on the first spring seat 82.

[0095] In one embodiment, a retaining ring portion 713 is provided protruding from the side of the valve core body 711 facing the moving shaft 3. The retaining ring portion 713 is coaxial and spaced around the outside of the cone portion 712. The first spring seat 82 is located inside the retaining ring portion 713 to restrict the first spring seat 82 from dislodging from the cone portion 712.

[0096] This embodiment also provides a gas-fired water heater, including the aforementioned gas proportional valve. By employing the gas proportional valve, the gas-fired water heater provided in this embodiment can improve the accuracy and reliability of water temperature regulation, thereby enhancing the user experience.

[0097] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0098] The specific embodiments described above are merely illustrative of several implementations of 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 characterized by, include: The valve body (200) is equipped with a valve core module (7); The electromagnetic mechanism (4) has a central hole and is connected to the valve body (200); The valve shaft includes a fixed shaft (2) and a moving shaft (3). The fixed shaft (2) is inserted into the central hole, and the moving shaft (3) is coaxial and slidably inserted into the fixed shaft (2). One end of the moving shaft (3) abuts against the valve core module (7). The electromagnetic mechanism (4) is used to drive the moving shaft (3). The position of the fixed shaft (2) is adjustable relative to the electromagnetic mechanism (4) in the axial direction. Adjusting element (6) is connected to the end of the fixed shaft (2) away from the valve core module (7) and can abut against the end of the moving shaft (3).

2. Gas proportional valve according to claim 1, characterized in that The gas proportional valve also includes a locking element (5), which is connected to the fixed shaft (2) and is used to restrict the axial movement of the fixed shaft (2).

3. Gas proportional valve according to claim 2, characterized in that The gas proportional valve also includes a valve cover (1), which is connected to the valve body (200) and located between the valve body (200) and the electromagnetic mechanism (4). A pilot valve cavity (300) is formed between the valve cover (1) and the valve body (200). The valve core module (7) is located in the pilot valve cavity (300). The valve cover (1) has a connecting hole (111) coaxial with the center hole. The fixed shaft (2) extends into the connecting hole (111) and is sealed to the inner wall of the connecting hole (111).

4. Gas proportional valve according to claim 3, characterized in that The connecting hole (111) is a threaded hole, and the fixed shaft (2) has a threaded shaft section (211), which is threaded into the threaded hole.

5. Gas proportional valve according to claim 4, characterized in that The locking member (5) is located between the valve cover (1) and the electromagnetic mechanism (4). The locking member (5) is screwed onto the threaded shaft section (211) and abuts against the valve cover (1). The locking member (5) and the electromagnetic mechanism (4) are spaced apart. An operating port (50) for operating the locking member (5) is provided between the valve cover (1) and the electromagnetic mechanism (4).

6. Gas proportional valve according to claim 5, characterized in that The valve cover (1) includes a main valve seat (11) and a support pad (12). The main valve seat (11) and the end of the electromagnetic mechanism (4) are opposite to each other and spaced apart in the axial direction of the valve shaft. The main valve seat (11) is provided with the connection hole (111). The support pad (12) is sandwiched between the main valve seat (11) and the electromagnetic mechanism (4) and is provided with multiple pads spaced apart around the valve shaft. The operating port (50) is formed between two adjacent support pads (12). The locking member (5) abuts against the main valve seat (11).

7. Gas proportional valve according to claim 6, characterized in that The support pad (12) and the main valve seat (11) are separately provided, and the electromagnetic mechanism (4), the support pad (12) and the main valve seat (11) are connected by fasteners that pass through the three in sequence; the height of the support pad (12) in the axial direction of the valve shaft is greater than the height of the locking member (5) in the axial direction.

8. Gas proportional valve according to claim 4, characterized in that The threaded shaft section (211) has a first annular groove (2111), and a sealing ring (10) is installed in the first annular groove (2111). The hole wall of the connecting hole (111) is provided with a second annular groove, and the sealing ring (10) is pressed between the groove wall of the first annular groove (2111) and the groove wall of the second annular groove.

9. Gas proportional valve according to any of claims 4 to 8, characterized in that The fixed shaft (2) includes a fixed iron core (21) and a sleeve (22). One end of the fixed iron core (21) is inserted into the central hole and the other end is inserted into the sleeve (22). The end of the sleeve (22) away from the fixed iron core (21) extends out of the electromagnetic mechanism (4) and is connected to the adjusting member (6). The fixed iron core (21) has the threaded shaft section (211). The moving shaft (3) includes a valve stem (32) that is coaxial and slidably inserted into the fixed iron core (21) and a moving iron core (31) that is fixedly sleeved on the outside of the valve stem (32). The moving iron core (31) is located inside the sleeve (22) and on the side of the fixed iron core (21) away from the valve core module (7). The moving iron core (31) and the fixed iron core (21) are spaced apart.

10. A gas water heating apparatus, characterised in that, Including the gas proportional valve as described in any one of claims 1-9.

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