Premixed air-fuel ratio valve and cooking appliance

Abstract

The present application provides a premixed air-fuel ratio valve and a cooking appliance. Among them, a premixed air-fuel ratio valve includes: a housing having a first chamber, a second chamber, and a third chamber inside, and an air inlet communicating with the second chamber and an air outlet communicating with the third chamber are respectively provided on the side thereof. The first chamber is located on the top side of the second chamber and communicates with the second chamber through a first opening. The first chamber and the second chamber respectively communicate with the third chamber through the side; a Venturi tube, one of its first inlet end or outlet end is used to communicate with a blower, and its second inlet end communicates with the air outlet; a first flow rate regulating assembly is built in the first chamber, and it includes: a first diaphragm, the first diaphragm is floatingly connected to the first chamber and its shape and size are adapted to the shape and size of the cross-section of the first chamber perpendicular to the longitudinal direction. The first diaphragm can float up and down along the longitudinal direction relative to the first chamber through the air pressure change in the first chamber to change the opening degree between the first opening and the first diaphragm.

Description

Technical Field

[0001] This application relates to the technical field of cooking appliance products, and particularly to a premixed air-fuel ratio valve and a cooking appliance. Background Art

[0002] Combustion of gas cooking appliances all requires air for combustion assistance. The mixing ratio and degree of mixing of gas and air determine the combustion degree of gas. When the mixing ratio of air and gas is optimal, the gas burns most fully, most completely, generates the highest calorific value, and produces the least amount of waste gas and harmful gases after combustion, thus achieving the purposes of high efficiency, energy conservation, and environmental protection.

[0003] Commercially available household cooking appliances generally adopt a natural aspiration primary air combustion structure for both the inner and outer rings. Its air intake depends on the setting of the air volume adjustment switch, and it is prone to phenomena such as yellow flames and incomplete combustion. Among the latest research products on the market, there are also structures that use a blower to supplement primary air. However, both of the above two structures are difficult to achieve an ideal mixing ratio of gas and air in the cooking appliance within the full power range, so the combustion effect is poor. Existing commercially available wall-mounted boilers have adopted a full premixed combustion structure. First, the pressure generated by the blower drives a pneumatic proportional valve to adjust the gas ratio, and then an adjustment mechanism set on the valve is used to maintain a constant air-fuel ratio.

[0004] However, due to limitations in the structure, the wall-mounted boiler is relatively large in size, and its minimum power is close to the maximum power of household cooking appliances. Currently, there is a lack of an air-fuel ratio valve for full premixed combustion of low-power household cooking appliances on the market. Therefore, how to achieve full premixed combustion of low-power household cooking appliances is a technical problem that the current cooking appliance industry urgently needs to solve. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a premixed air-fuel ratio valve and a cooking appliance to achieve full premixed combustion of low-power household cooking appliances.

[0006] To solve the above technical problems, the embodiments of this application provide the following technical solutions:

[0007] In the first aspect of the present application, a premixed air-fuel ratio valve is provided. The premixed air-fuel ratio valve includes: a housing having a first chamber, a second chamber, and a third chamber inside. An air inlet communicating with the second chamber and an air outlet communicating with the third chamber are respectively provided on the side of the housing. The first chamber is located on the top side of the second chamber and communicates with the second chamber through a first opening. The first chamber and the second chamber respectively communicate with the third chamber through the side; a venturi tube, one of its first inlet end or outlet end is used to communicate with a blower, and its second inlet end communicates with the air outlet; a first flow rate regulating assembly built in the first chamber, which includes: a first diaphragm, the first diaphragm is floatingly connected to the first chamber and its shape and size are adapted to the shape and size of the cross-section of the first chamber perpendicular to the longitudinal direction. The first diaphragm can float up and down along the longitudinal direction relative to the first chamber through the air pressure change in the first chamber to change the opening degree between the first opening and the first diaphragm; and a second flow rate regulating assembly built in the second chamber, which includes: an isolation seat, a valve core, and a second diaphragm. The isolation seat is installed in the second chamber and is located below the connection between the second chamber and the third chamber. A second opening penetrating the isolation seat is longitudinally provided in the middle thereof. The valve core is floatingly connected to the isolation seat and penetrates the second opening. A first ventilation hole penetrating the valve core is longitudinally provided thereon. The second diaphragm is sleeved on the valve core and is located above the connection between the second chamber and the third chamber. Its shape and size are adapted to the shape and size of the cross-section of the second chamber perpendicular to the longitudinal direction to divide the second chamber into a first cavity and a second cavity along the longitudinal direction. The first cavity communicates with the second cavity through the first ventilation hole. The second diaphragm can drive the valve core to float up and down along the longitudinal direction relative to the second opening through the pressure difference change between the first cavity and the second cavity to change the opening degree between the second opening and the valve core.

[0008] In some modified embodiments of the first aspect of the present application, a first installation groove is provided on the top side of the housing corresponding to the position of the second chamber. The first opening is provided at the bottom of the first installation groove. The side of the first installation groove communicates with the third chamber; the first flow rate regulating assembly further includes: an end cover installed on the top side of the housing and closing the first installation groove to form the first chamber; a first installation seat installed at the first opening, and a second ventilation hole penetrating the first installation seat and communicating with the first opening is longitudinally provided thereon; and a first floating spring extending along the longitudinal direction and having its two ends respectively connected to the bottom of the first installation seat and the bottom of the first diaphragm.

[0009] In some modified embodiments of the first aspect of the present application, the first flow rate regulating assembly further includes: a first adjusting screw, a first screw hole penetrating the end cover is longitudinally provided on the top of the end cover, and the first adjusting screw is screwed into the first screw hole; and an adjusting spring extending along the longitudinal direction and having its two ends respectively connected to the bottom of the first adjusting screw and the top of the first diaphragm.

[0010] In some modified embodiments of the first aspect of the present application, the second flow rate regulating component further includes: a second mounting base mounted on the bottom side of the isolation base. The second mounting base is a housing with at least one third ventilation hole provided on its side. The top of the second mounting base communicates with the second opening through an opening, and the air inlet communicates with the second opening and the first chamber through at least one third ventilation hole; and a second floating spring extending longitudinally with its two ends respectively connected to the valve core and the inner wall of the bottom of the second mounting base.

[0011] In some modified embodiments of the first aspect of the present application, at least one pipeline interface communicating with the first cavity is provided on the end cover for communicating with the first inlet end of the Venturi tube.

[0012] In some modified embodiments of the first aspect of the present application, the premixed air-fuel ratio valve further includes: an air intake cut-off component. There is also a fourth chamber inside the outer shell. A second mounting groove penetrating the outer shell is provided at the position corresponding to the fourth chamber on the top side of the outer shell. The fourth chamber communicates with the outside of the outer shell through the second mounting groove. The bottom of the fourth chamber communicates with the second chamber through a third opening. The side of the fourth chamber communicates with the air inlet. The air intake cut-off component penetrates the second mounting groove and is partially located in the fourth chamber, and it includes: an electromagnetic coil provided above the second mounting groove and closing the second mounting groove. The electromagnetic coil extends in a longitudinal winding and is electrically connected to a power source; a fixed iron core built in the winding center of the electromagnetic coil and fixed to the end of the electromagnetic coil away from the second mounting groove; a moving iron core built in the winding center of the electromagnetic coil and located below the fixed iron core with a preset distance from the fixed iron core; and a closing member connected to the moving iron core and located below the moving iron core. Wherein, the moving iron core can drive the closing member to reciprocate longitudinally relative to the electromagnetic coil through electromagnetic induction to open and close the third opening.

[0013] In some modified embodiments of the first aspect of the present application, the moving iron core is divided into: a first moving iron core and a second moving iron core from top to bottom longitudinally. The top of the second moving iron core is connected to the bottom of the first moving iron core through a first compression spring; the closing member is divided into: a first closing member and a second closing member. The first closing member is connected to the first moving iron core and is located below the second moving iron core. The top of the first closing member abuts against the bottom of the electromagnetic coil through a second compression spring. The second closing member is connected to the bottom of the second moving iron core.

[0014] In some modified embodiments of the first aspect of the present application, the premixed air-fuel ratio valve further includes: an outlet adjusting assembly installed in the third chamber, which includes: a second adjusting screw, a fourth opening longitudinally penetrating the housing is formed in the top side of the third chamber, the second adjusting screw penetrates through the fourth opening and is rotatably connected to the bottom of the third chamber; an adjusting member, a second threaded hole penetrating the adjusting member and adapted to the second adjusting screw is formed longitudinally thereon, the adjusting member is connected to the second adjusting screw through the second threaded hole and can reciprocate longitudinally between a first position and a second position relative to the outlet; and a pre-tightening spring sleeved on the second adjusting screw and having two ends respectively abutted against the inner wall of the top side of the third chamber and the top side of the adjusting member; wherein when the adjusting member is in the first position, the adjusting member completely closes the outlet, and when the adjusting member is in the second position, the adjusting member completely exposes the outlet.

[0015] In some modified embodiments of the first aspect of the present application, a limiting rib adapted to the outer dimension of the adjusting member is provided at the position of the third chamber corresponding to the adjusting member.

[0016] The second aspect of the present application provides a cooking appliance, which includes: the premixed air-fuel ratio valve provided in any of the first aspects of the present application above.

[0017] Compared with the prior art, for the premixed air-fuel ratio valve provided in this application, in the initial state when no gas is introduced into the air inlet, the valve core in the second flow regulating component closes the second opening of the isolation seat. The second diaphragm divides the second chamber into a non-communicating first cavity and second cavity from top to bottom. When gas is input into the second chamber through the air inlet, the gas can only first enter the first cavity above the second chamber through the first ventilation hole of the valve core in the second cavity below the second chamber. Then, the gas enters the first chamber through the first opening and enters the third chamber from the side of the first chamber. Finally, it enters the second inlet end of the Venturi tube through the air outlet and is discharged from the outlet end of the Venturi tube after being mixed with the air introduced into the first inlet end of the Venturi tube. When gas is discharged from the air outlet, the internal air pressure of the first chamber communicating with the air outlet in the third chamber changes to generate a pressure difference. This pressure difference can change the opening degree between the first diaphragm and the first opening, thereby changing the flow rate of the gas flowing into the first chamber from the first opening. When the opening degree between the first diaphragm and the first opening gradually decreases, the air pressure in the first cavity above the second chamber rises, causing the second diaphragm to drive the valve core to move downward, so that the valve core cannot completely close the second opening on the isolation seat. A part of the gas in the second chamber enters the first chamber through the first opening via the first ventilation hole on the valve core, then enters the third chamber from the first chamber, and finally enters the Venturi tube through the air outlet to be mixed with the air. Another part of the gas directly enters the third chamber through the second opening of the isolation seat and then enters the Venturi tube through the air outlet to be mixed with the air. The premixed air-fuel ratio valve provided in this application changes the up and down positions of the first diaphragm in the first flow regulating component and the second diaphragm in the second flow regulating component through the change of the internal air pressure of the housing when the gas flows, so as to control the opening degree of the connection between the first chamber and the second chamber inside the housing, thereby realizing the regulation of the gas flow rate, so that different flow rates of gas can be fully mixed with the air after entering the Venturi tube. The premixed air-fuel ratio valve proposed in this application has a compact structure, and the aperture of the first ventilation hole of the valve core in its second flow regulating component ensures its maximum combustion power, so that it is applicable to household small cookers with a combustion power lower than 5.23 kW. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of this application will become easily understandable. In the drawings, several embodiments of this application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where:

[0019] Figure 1 shows the structural schematic diagram of the premixed air-fuel ratio valve proposed in Embodiment 1 of the present invention;

[0020] Figure 2 shows Figure 1 a partial enlarged schematic diagram of the structure of part A in

[0021] Figure 3 shows Figure 1 a partial enlarged schematic view of the structure of part B therein;

[0022] Figure 4 shows an axonometric structural schematic view of an angle of the housing of the premixed air-fuel ratio valve proposed in the first embodiment of the present invention;

[0023] Figure 5 shows an axonometric structural schematic view of another angle of the housing of the premixed air-fuel ratio valve proposed in the first embodiment of the present invention;

[0024] Figure 6 shows a schematic view of a cross-sectional view of the structure of the housing of the premixed air-fuel ratio valve proposed in the first embodiment of the present invention;

[0025] Figure 7 shows an axonometric structural schematic view of the end cap of the premixed air-fuel ratio valve proposed in the first embodiment of the present invention;

[0026] Figure 8 shows a schematic view of the state when the second opening of the second flow rate regulating assembly of the premixed air-fuel ratio valve proposed in the first embodiment of the present invention is opened;

[0027] Figure 9 shows a schematic view of the state when the first closing member and the second closing member of the intake air cut-off assembly of the premixed air-fuel ratio valve proposed in the first embodiment of the present invention close the third opening.

[0028] Explanation of the reference numerals in the drawings:

[0029] 1. Housing; 101. First chamber; 101a. First mounting groove; 101b. First opening; 102. Second chamber; 102a. First cavity; 102b. Second cavity; 103. Third chamber; 103a. Fourth opening; 103b. Limiting rib; 104. Fourth chamber; 104a. Second mounting groove; 104b. Third opening; 105. Air inlet; 106. Air outlet; 2. Venturi tube; 201. First inlet end; 202. Second inlet end; 203. Throat; 204. Outlet end; 3. First diaphragm; 4. Isolation seat; 401. Second opening; 5. Valve core; 501. First ventilation hole; 6. Second diaphragm; 7. End cover; 701. First screw hole; 702. Pipeline interface; 8. First mounting seat; 801. Second ventilation hole; 9. First floating spring; 10. First adjusting screw; 11. Adjusting spring; 12. Second mounting seat; 1201. Third ventilation hole; 13. Second floating spring; 14. Electromagnetic coil; 15. Fixed iron core; 16. First moving iron core; 17. First closing member; 18. Second moving iron core; 19. Second closing member; 20. First compression spring; 21. Second compression spring; 22. Second adjusting screw; 23. Adjusting member; 24. Pre-tightening spring. Detailed implementation manners

[0030] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0031] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which this application belongs.

[0032] Embodiment 1

[0033] Refer to the attached Figure 1 to the attached Figure 6 and the attached Figure 8, Embodiment 1 of the present invention provides a premixed air-fuel ratio valve, which includes: a housing 1 with a first chamber 101, a second chamber 102 and a third chamber 103 inside. An air inlet 105 communicating with the second chamber 102 and an air outlet 106 communicating with the third chamber 103 are respectively provided on the side of the housing 1. The first chamber 101 is located on the top side of the second chamber 102 and communicates with the second chamber 102 through a first opening 101b. The first chamber 101 and the second chamber 102 communicate with the third chamber 103 through the sides respectively; a Venturi tube 2, one of its first inlet end 201 or outlet end 204 is used to communicate with a fan, and its second inlet end 202 communicates with the air outlet 106; a first flow rate adjustment component is built in the first chamber 101, which includes: a first diaphragm 3, the first diaphragm 3 is floatingly connected to the first chamber 101 and its shape and size are adapted to the shape and size of the cross-section of the first chamber 101 perpendicular to the longitudinal direction. The first diaphragm 3 can float up and down along the longitudinal direction relative to the first chamber 101 through the air pressure change in the first chamber 101 to change the opening degree between the first opening 101b and the first diaphragm 3; and a second flow rate adjustment component is built in the second chamber 102, which includes: an isolation seat 4, a valve core 5 and a second diaphragm 6. The isolation seat 4 is installed in the second chamber 102 and is located below the communication part between the second chamber 102 and the third chamber 103. A second opening 401 penetrating the isolation seat 4 is provided in the middle of the isolation seat 4 along the longitudinal direction. The valve core 5 is floatingly connected to the isolation seat 4 and penetrates the second opening 401. A first ventilation hole 501 penetrating the valve core 5 is provided on it along the longitudinal direction. The second diaphragm 6 is sleeved on the valve core 5 and is located above the communication part between the second chamber 102 and the third chamber 103. Its shape and size are adapted to the shape and size of the cross-section of the second chamber 102 perpendicular to the longitudinal direction to divide the second chamber 102 into a first cavity 102a and a second cavity 102b along the longitudinal direction. The first cavity 102a communicates with the second cavity 102b through the first ventilation hole 501. The second diaphragm 6 can drive the valve core 5 to float up and down along the longitudinal direction relative to the second opening 401 through the pressure difference change between the first cavity 102a and the second cavity 102b to change the opening degree between the second opening 401 and the valve core 5.

[0034] Specifically, the premixed air-fuel ratio valve includes a housing 1. The housing 1 is an integrally formed housing or a housing formed by welding a combination of multiple housings. Its bottom has an opening, and the bottom plate can be connected by bolts to close the opening. Inside the housing 1, there are a first chamber 101, a second chamber 102, and a third chamber 103. The first chamber 101 is located above the second chamber 102. The bottom of this chamber has a first opening 101b. The first chamber 101 can communicate with the second chamber 102 through the first opening 101b. The third chamber 103 is located on the side of the first chamber 101 and the second chamber 102, and can communicate with the first chamber 101 and the second chamber 102 respectively. An air inlet 105 communicating with the second chamber 102 and an air outlet 106 communicating with the third chamber 103 are also provided on the side of the housing 1. The air inlet 105 is used to communicate with a gas pipeline to introduce gas into the interior of the housing 1. The air outlet 106 communicates with the second inlet end 202 of the Venturi tube 2 to introduce the gas inside the housing 1 into the Venturi tube 2. A blower can be externally connected to the first inlet end 201 of the Venturi tube 2 for blowing air or externally connected to the outlet end 204 of the Venturi tube 2 for air extraction. After the air is introduced into the Venturi tube 2 from the first inlet end 201 of the Venturi tube 2, it can be mixed with the gas introduced from the second inlet end 202 in the Venturi tube 2, and the mixed gas after mixing is output from the outlet end 204 of the Venturi tube 2.

[0035] Specifically, a first flow rate regulating component is disposed in the first chamber 101 of the housing 1, and a second flow rate regulating component is disposed in the second chamber 102. The first diaphragm 3 in the first flow rate regulating component is adapted to the shape and size of the first chamber 101 so that it can isolate the first chamber 101 longitudinally and cover the first opening 101b. The first diaphragm 3 is floatingly connected in the first chamber 101. When the air pressures on the upper and lower sides of the first diaphragm 3 change, under the action of the pressure difference, the first diaphragm 3 can float up and down relative to the first opening 101b to change the covering opening degree between it and the first opening 101b. The second flow rate regulating component includes: an isolation seat 4, a valve core 5, and a second diaphragm 6. The isolation seat 4 is installed in the second chamber 102 and is located below the communication between the second chamber 102 and the third chamber 103. A second opening 401 is longitudinally formed in the middle thereof. The valve core 5 is floatingly connected to the isolation seat 4 and penetrates through the second opening 401. A first ventilation hole 501 that penetrates it is longitudinally formed thereon. The second diaphragm 6 is sleeved on the valve core 5 and is located above the communication between the second chamber 102 and the third chamber 103. The shape and size of the second diaphragm 6 are adapted to the shape and size of the second chamber 102 to divide it longitudinally into a first cavity 102a and a second cavity 102b. The first cavity 102a is located on the top side of the second diaphragm 6, and the second cavity 102b is located on the bottom side of the second diaphragm 6. When a pressure difference is generated between the first cavity 102a and the second cavity 102b, the second diaphragm 6 will float up and down to change the opening degree between the valve core 5 and the second opening 401. When there is no pressure difference or the pressure difference is less than the pre-pressure of the second floating spring 13 between the first cavity 102a and the second cavity 102b, the valve core 5 can close the second opening 401.

[0036] According to the above, in the initial state, that is, when no gas is introduced into the air inlet 105, the valve core 5 in the second flow regulating component closes the second opening 401 of the isolation seat 4. The second diaphragm 6 divides the second chamber 102 into a non-communicating first cavity 102a and a second cavity 102b from top to bottom. When gas is input into the second chamber 102 through the air inlet 105, the gas can only first enter the first cavity 102a above the second chamber 102 through the first vent hole 501 of the valve core 5 in the second cavity 102b below the second chamber 102. Then, the gas enters the first chamber 101 through the first opening 101b and enters the third chamber 103 from the side of the first chamber 101. Finally, it enters the second inlet end 202 of the Venturi tube 2 through the air outlet 106 and is discharged from the outlet end 204 of the Venturi tube 2 after being mixed with the air introduced into the first inlet end 201 of the Venturi tube 2. When the rotational speed of the fan connected to the Venturi tube 2 changes, the air pressure in the cavities on the upper and lower sides of the first diaphragm 3 inside the first chamber 101 connected to the third chamber 103 and the air outlet 106 changes to generate a pressure difference. This pressure difference can change the opening degree between the first diaphragm 3 and the first opening 101b, thereby changing the flow rate of the gas flowing into the first chamber 101 from the first opening 101b. When the opening degree between the first diaphragm 3 and the first opening 101b gradually decreases, the air pressure in the first cavity 102a above the second chamber 102 rises, causing the second diaphragm 6 to drive the valve core 5 to move downward, so that the valve core 5 cannot completely close the second opening 401 on the isolation seat 4. Part of the gas in the second chamber 102 enters the first chamber 101 through the first vent hole 501 on the valve core 5 and then enters the third chamber 103 through the first chamber 101. Finally, it enters the Venturi tube 2 through the air outlet 106 and is mixed with the air. Another part of the gas directly enters the third chamber 103 through the second opening 401 of the isolation seat 4 and then enters the Venturi tube 2 through the air outlet 106 and is mixed with the air. The premixed air-fuel ratio valve provided in this application can change the air pressure change on the upper and lower sides of the first diaphragm 3 in the first chamber 101 by controlling the rotational speed of the fan, thereby generating a pressure difference. Through this pressure difference, the opening degree between the first diaphragm 3 and the first opening 101b is controlled, and then the pressure difference between the first cavity 102a and the second cavity 102b on the upper and lower sides of the second diaphragm 6 in the second chamber 102 is changed to change the opening degree between the valve core 5 and the second opening 401, so as to realize the regulation of the gas flow rate, so that different flow rates of gas can be fully mixed with air after entering the Venturi tube 2.

[0037] Further, refer to Att Figure 1 ., Att Figure 2 ., and Att Figure 4 ... to Att Figure 7, in the first embodiment of the present invention, for the premixed air-fuel ratio valve, in specific implementation, a first mounting groove 101a is provided at the top side of the housing 1 corresponding to the position of the second chamber 102, a first opening 101b is opened at the bottom of the first mounting groove 101a, and the side of the first mounting groove 101a communicates with the third chamber 103; the first flow rate adjustment assembly further includes: an end cap 7, installed on the top side of the housing 1 and closing the first mounting groove 101a to form a first chamber 101; a first mounting seat 8, installed at the first opening 101b, and a second ventilation hole 801 penetrating through the first mounting seat 8 and communicating with the first opening 101b is longitudinally provided thereon; and a first floating spring 9, extending longitudinally and having both ends respectively connected to the bottom of the first mounting seat 8 and the first diaphragm 3.

[0038] Specifically, in order to achieve the floating connection of the first diaphragm 3 in the first chamber 101, in the technical solution adopted by the present invention, a first mounting groove 101a is provided at the top side of the housing 1 corresponding to the position of the second chamber 102, a first opening 101b is opened at the bottom of the first mounting groove 101a, the side of the first mounting groove 101a communicates with the third chamber 103, an end cap 7 for closing the first mounting groove 101a to form a first chamber 101 is installed on the top side of the housing 1, a first mounting seat 8 is installed at the first opening 101b at the bottom of the first mounting groove 101a, a second ventilation hole 801 penetrating through it and communicating with the first opening 101b is longitudinally provided thereon, a first floating spring 9 is sleeved on the first mounting seat 8, and the other end of the first floating spring 9 is sleeved on the bottom of the first diaphragm 3. When the air pressure in the first chamber 101 is the standard air pressure, the first floating spring 9 can be in a free state, so that the fuel gas enters the first chamber 101 from the opening degree between the second ventilation hole 801 on the first mounting seat 8 and the first diaphragm 3, enters the third chamber 103 from the first chamber 101, and finally enters the venturi tube 2 from the air outlet 106; when the fuel gas in the third chamber 103 flows into the venturi tube 2 through the air outlet 106, under the action of the fluid generated by the fan drive, the air pressures in the cavities on both the upper and lower sides of the first diaphragm 3 change to generate an air pressure difference, and the first diaphragm 3 drives the first floating spring 9 to expand and contract under the action of the air pressure difference, thereby changing the opening degree between the first diaphragm 3 and the second ventilation hole 801 on the first mounting seat 8, and thus changing the flow rate of the fuel gas entering the first chamber 101 through the second ventilation hole 801.

[0039] Further, referring to Appendix Figure 1 、Appendix Figure 2 and Appendix Figure 4 to Appendix Figure 6, in the first embodiment of the present invention, the premixed air-fuel ratio valve. In specific implementation, the first flow rate adjustment assembly further includes: a first adjustment screw 10, a first screw hole 701 penetrating the end cover 7 longitudinally is provided at the top of the end cover 7, and the first adjustment screw 10 is screwed into the first screw hole 701; and an adjustment spring 11, extending longitudinally and having its two ends respectively connected to the bottom of the first adjustment screw 10 and the top of the first diaphragm 3.

[0040] Specifically, in order to make the flow rate of the fuel gas flowing out of the second vent hole 801 of the first mounting seat 8 in the first flow rate adjustment assembly adjustable, in the technical solution adopted by the present invention, a first screw hole 701 penetrating the end cover 7 longitudinally and communicating with the first chamber 101 is provided at the top of the end cover 7, the first adjustment screw 10 is screwed into the first screw hole 701, an adjustment spring 11 is sleeved on its bottom, and the other end of the adjustment spring 11 is sleeved on the top of the first diaphragm 3. By rotating the first adjustment screw 10, the pre-pressure of the adjustment spring 11 on the first diaphragm 3 can be increased or decreased, so as to change the pre-pressure difference between the first floating spring 9 and the adjustment spring 11, and further change the magnitude of the pressure difference when the first diaphragm 3 floats up and down, so as to achieve the purpose of adjusting the opening degree between the first diaphragm 3 and the second vent hole 801 of the first mounting seat 8.

[0041] Further, referring to Appendix Figure 1 , Appendix Figure 3 to Appendix Figure 6 and Appendix Figure 8 , in the first embodiment of the present invention, the premixed air-fuel ratio valve. In specific implementation, the second flow rate adjustment assembly further includes: a second mounting seat 12, installed on the bottom side of the isolation seat 4, the second mounting seat 12 is a housing with at least one third vent hole 1201 provided on its side, the top of the second mounting seat 12 communicates with the second opening 401 through an opening, and the air inlet 105 communicates with the second opening 401 and the first chamber 101 through at least one third vent hole 1201; and a second floating spring 13, extending longitudinally and having its two ends respectively connected to the valve core 5 and the inner wall of the bottom of the second mounting seat 12.

[0042] Specifically, in order to achieve the floating connection of the second diaphragm 6 in the second chamber 102, in the technical solution adopted by the present invention, a second mounting seat 12 is sleeved on the bottom of the isolation seat 4 in the second chamber 102. The second mounting seat 12 is a housing with an opening at the top. The opening is installed at the bottom of the isolation seat 4 and covered by the isolation seat 4. The second opening 401 on the isolation seat 4 communicates with the inside of the second mounting seat 12. A third ventilation hole 1201 is provided on the side of the second mounting seat 12. The gas in the second chamber 102 can enter the inside of the second mounting seat 12 through the third ventilation hole 1201 and enter the third chamber 103 through the second opening 401 of the isolation seat 4 or enter the first chamber 101 through the first ventilation hole 501 of the valve core 5. A second floating spring 13 is connected to the inner wall of the bottom of the second mounting seat 12. The other end of the second floating spring 13 is sleeved on the bottom of the valve core 5. The valve core 5 is placed inside the housing of the second mounting seat 12 and partially penetrates through the second opening 401 of the isolation seat 4. The valve core 5 has a circumferential side portion with a shape and size adapted to the second opening 401 of the isolation seat 4. Under the thrust of the second floating spring 13, the circumferential side portion of the valve core 5 can seal the second opening 401. When the gas inside the second mounting seat 12 enters the first cavity 102a on the top side of the second diaphragm 6 through the first ventilation hole 501 of the valve core 5, some of the gas that has not entered the first chamber 101 through the second ventilation hole 801 of the first mounting seat 8 in time will make the air pressure in the first cavity 102a greater than the air pressure in the second cavity 102b on the bottom side of the second diaphragm 6, thus generating a pressure difference. Under the action of the pressure difference, the second diaphragm 6 drives the valve core 5 to move downward, so that the circumferential side portion of the valve core 5 cannot close the second opening 401, and the gas inside the second mounting seat 12 can directly enter the third chamber 103 through the second opening 401, thereby reducing the flow rate of the gas entering the first chamber 101 through the first ventilation hole 501 of the valve core 5 to achieve the effect of regulating the gas flow rate by the second flow rate regulating component.

[0043] Further, referring to Figure 1 , Figure 2 and Figure 7 , in the premixed air-fuel ratio valve proposed in the first embodiment of the present invention, in a specific implementation, at least one pipeline interface 702 communicating with the first cavity 102a is provided on the end cover 7 for communicating with the first inlet end 201 of the Venturi tube 2.

[0044] Specifically, in order to implement another control method for the first flow regulating component, in the technical solution adopted by the present invention, a pipeline interface 702 communicating with the first cavity 102a is provided on the end cover 7. The pipeline interface 702 can be communicated with the first inlet end 201 of the venturi tube 2 through a pipeline. When air is introduced into the venturi tube 2, under the action of the fluid, the air pressure in the first chamber 101 communicated with the throat 203 of the venturi tube 2 changes, thereby generating an air pressure difference that can drive the first diaphragm 3 to float up and down, thereby changing the opening degree between the first diaphragm 3 and the second ventilation hole 801 of the first mounting seat 8, so as to realize the control of the gas flow rate through the first flow regulating component.

[0045] Further, referring to Appendix Figure 1 , Appendix Figure 3 to Appendix Figure 6 and Appendix Figure 9 , in the premixed air-fuel ratio valve proposed in the first embodiment of the present invention, in a specific implementation, the premixed air-fuel ratio valve further includes: an intake cut-off component. There is also a fourth chamber 104 inside the housing 1. A second mounting groove 104a penetrating the housing 1 is provided at the top side of the housing 1 corresponding to the position of the fourth chamber 104. The fourth chamber 104 is communicated with the outside of the housing 1 through the second mounting groove 104a. The bottom of the fourth chamber 104 is communicated with the second chamber 102 through a third opening 104b. The side of the fourth chamber 104 is communicated with the air inlet 105. The intake cut-off component penetrates the second mounting groove 104a and is partially located in the fourth chamber 104, and includes: an electromagnetic coil 14, which is arranged above the second mounting groove 104a and closes the second mounting groove 104a. The electromagnetic coil 14 is wound and extended longitudinally and is electrically connected to a power source; a fixed iron core 15, which is placed inside the winding center of the electromagnetic coil 14 and is fixed to the end of the electromagnetic coil 14 away from the second mounting groove 104a; a moving iron core, which is placed inside the winding center of the electromagnetic coil 14 and is located below the fixed iron core 15 and is spaced apart from the fixed iron core 15 by a preset distance; and a closing member, which is connected to the moving iron core and is located below the moving iron core. Wherein, the moving iron core can drive the closing member to reciprocate longitudinally relative to the electromagnetic coil 14 through electromagnetic induction to open and close the third opening 104b.

[0046] Specifically, in order to control the on-off of the gas at the air inlet 105, in the technical solution adopted by the present invention, a fourth chamber 104 is further provided inside the housing 1. A second installation groove 104a penetrating the housing 1 is provided at the top of the fourth chamber 104. The side of the fourth chamber 104 is communicated with the air inlet 105, and a third opening 104b is provided at its bottom. The fourth chamber 104 can be communicated with the second chamber 102 through the third opening 104b. An air intake cut-off component is installed on the second installation groove 104a. Part of the component is located inside the fourth chamber 104. The air intake cut-off component includes an electromagnetic coil 14 located above the second installation groove 104a and electrically connected to a power source. The electromagnetic coil 14 is wound longitudinally and extends to the bottom of the second installation groove 104a. A fixed iron core 15 is fixed at the top of its winding center. A moving iron core is provided at a preset distance below the fixed iron core 15. Part of the moving iron core is located in the fourth chamber 104 and a closing member is connected to its bottom. When the electromagnetic coil 14 is not energized, the closing member closes the third opening 104b so that the fourth chamber 104 and the second chamber 102 are not communicated with each other. When the electromagnetic coil 14 is energized to generate electromagnetic excitation, the fixed iron core 15 obtains magnetism. The moving iron core moves upward longitudinally under the action of the magnetic force until the top of the moving iron core fits with the bottom of the fixed iron core 15. Driven by the upward movement of the moving iron core, the closing member moves upward so that the fourth chamber 104 is communicated with the second chamber 102 through the third opening 104b.

[0047] Further, referring to Att Figure 1 achment Figure 3 s Figure 6 to Att Figure 9 achment

[0048] In the specific implementation of the premixed air-fuel ratio valve proposed in the first embodiment of the present invention, referring to Attachment 1, Attachment 2, Attachment 3, Attachment 4, and Attachment 5, the moving iron core is sequentially divided into a first moving iron core 16 and a second moving iron core 18 from top to bottom in the longitudinal direction. The top of the second moving iron core 18 is connected to the bottom of the first moving iron core 16 through a first compression spring 20. The closing member is divided into a first closing member 17 and a second closing member 19. The first closing member 17 is connected to the first moving iron core 16 and is located below the second moving iron core 18. The top of the first closing member 17 abuts against the bottom of the electromagnetic coil 14 through a second compression spring 21. The second closing member 19 is connected to the bottom of the second moving iron core 18.

[0048] Specifically, in order to achieve secondary cutting of the gas at the air inlet 105 through the air intake cut-off assembly, in the technical solution adopted by the present invention, the moving iron core is longitudinally divided into: a first moving iron core 16 and a second moving iron core 18 from top to bottom. The top of the second moving iron core 18 is connected to the bottom of the first moving iron core 16 through a first compression spring 20. The closing member is divided into: a first closing member 17 and a second closing member 19. The first closing member 17 is sleeved on the side of the first moving iron core 16 and its bottom extends into the fourth chamber 104. The part of it located in the fourth chamber 104 abuts against the bottom of the electromagnetic coil 14 through a second compression spring 21. The second closing member 19 is nested on the bottom side of the first closing member 17 and is connected to the bottom of the second moving iron core 18. When the electromagnetic coil 14 is not energized, under the thrust of the second compression spring 21, the first closing member 17 drives the second closing member 19 to close the third opening 104b, so that the fourth chamber 104 and the second chamber 102 are not connected to each other; when the electromagnetic coil 14 is energized, the fixed iron core 15 obtains magnetic excitation. Under the magnetic force, the first moving iron core 16 moves longitudinally upward until its top fits against the bottom of the fixed iron core 15. The first closing member 17 moves upward synchronously under the drive of the first moving iron core 16. When the first moving iron core 16 moves upward, under the combined action of the first compression spring 20, the fixed iron core 15 and the first moving iron core 16, the second moving iron core 18 moves longitudinally upward until its top fits against the bottom of the first moving iron core 16. The second closing member 19 moves upward synchronously under the drive of the second moving iron core 18, so that the fourth chamber 104 and the second chamber 102 communicate with each other through the third opening 104b; when the electromagnetic coil 14 is de-energized, under the thrust of the second compression spring 21, the first closing member 17 drives the second closing member 19 to move downward simultaneously until the third opening 104b is completely closed. After adopting this secondary cutting structure, the air intake cut-off assembly can effectively cut off the gas at the air inlet 105. Even if one of the closing members fails due to mechanical failure, the other closing member can still close the third opening 104b, effectively avoiding the harm of gas leakage.

[0049] Further, referring to the attached Figure 1 and the attached Figure 4 to the attached Figure 6, in the first embodiment of the present invention, the premixed air-fuel ratio valve proposed. In specific implementation, the premixed air-fuel ratio valve further includes: an air outlet 106 adjusting assembly, which is installed in the third chamber 103 and includes: a second adjusting screw 22. A fourth opening 103a is formed in the top side of the third chamber 103 and penetrates the housing 1 longitudinally. The second adjusting screw 22 penetrates the fourth opening 103a and is rotatably connected to the bottom of the third chamber 103; an adjusting member 23, which is provided with a second screw hole that penetrates the adjusting member 23 and is adapted to the second adjusting screw 222. The adjusting member 23 is connected to the second adjusting screw 22 through the second screw hole and can reciprocally move longitudinally between a first position and a second position relative to the air outlet 106; and a pre-tightening spring 24, which is sleeved on the second adjusting screw 22 and its two ends respectively abut against the inner wall of the top side of the third chamber 103 and the top side of the adjusting member 23. Wherein, when the adjusting member 23 is in the first position, the adjusting member 23 completely closes the air outlet 106, and when the adjusting member 23 is in the second position, the adjusting member 23 completely exposes the air outlet 106.

[0050] Specifically, in order to control the flow rate of the fuel gas output from the air outlet 106, in the technical solution adopted by the present invention, a fourth opening 103a penetrating the housing 1 is formed in the top side of the third chamber 103. A limiting structure is arranged at the bottom of the third chamber 103. The second adjusting screw 22 is rotatably connected to the limiting structure at the bottom of the third chamber 103 through the fourth opening 103a. An adjusting member 23 is sleeved on the thread of the second adjusting screw 22. A part of the adjusting member 23 fits on the inner wall where the air outlet 106 is located and its shape and size are adapted to the shape and size of the air outlet 106. A pre-tightening spring 24 is also sleeved on the thread of the second adjusting screw 22. The two ends of the pre-tightening spring 24 respectively abut against the bottom of the nut of the second adjusting screw 22 and the top of the connection part between the adjusting member 23 and the second adjusting screw 22. When the second adjusting screw 22 is rotated, under the rotational action of the thread on the second adjusting screw 22, the adjusting member 23 can move up and down longitudinally relative to the air outlet 106. When the adjusting member 23 moves to the highest position, it completely closes the air outlet 106.

[0051] Further, referring to Figure 1 and Figure 4 to Figure 6 , in the first embodiment of the present invention, the premixed air-fuel ratio valve proposed. In specific implementation, a limiting rib 103b adapted to the outer shape and size of the adjusting member 23 is arranged at the position of the third chamber 103 corresponding to the adjusting member 23.

[0052] Specifically, in order to prevent the regulating member 23 from failing to close the air outlet 106 due to accidental touch or its own rotation, in the technical solution adopted by the present invention, a limiting rib 103b adapted to the side dimension of the regulating member 23 is provided on the inner wall of the third chamber 103 inside the housing 1 corresponding to the regulating member 23. When the regulating member 23 moves vertically up and down under the drive of the second adjusting screw 22, the limiting rib 103b can limit the rotation of the regulating member 23, thereby improving the closing effect of the regulating member 23 on the air outlet 106.

[0053] Embodiment 2

[0054] Embodiment 2 of the present invention provides a cooking appliance, which includes: the premixed air-fuel ratio valve proposed in any one of Embodiments 1 of the present invention above.

[0055] Specifically, after applying the premixed air-fuel ratio valve proposed in Embodiment 1 of the present invention above, the maximum combustion power of this cooking appliance does not exceed 5.23 kW and is suitable for household use.

[0056] It should be noted that in the description of this specification, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention; terms such as "connection", "installation", and "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", and "specific embodiments" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0058] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A premixed air-fuel ratio valve for household cooktops with a power not higher than 5.23 kW, characterized in that, Comprising: A housing having a first chamber, a second chamber and a third chamber inside. Air inlets communicating with the second chamber and air outlets communicating with the third chamber are respectively provided on the side portions thereof. The first chamber is located on the top side of the second chamber and communicates with the second chamber through a first opening. The first chamber and the second chamber respectively communicate with the third chamber through side portions. A Venturi tube, one of its first inlet end or outlet end is used to communicate with a blower, and its second inlet end communicates with the air outlet. A first flow rate regulating assembly built in the first chamber, which includes: a first diaphragm, the first diaphragm is floatingly connected to the first chamber and its shape and size are adapted to the shape and size of the cross-section of the first chamber perpendicular to the longitudinal direction. The first diaphragm can float up and down along the longitudinal direction relative to the first chamber through the air pressure change in the first chamber to change the opening degree between the first opening and the first diaphragm; and A second flow rate regulating assembly built in the second chamber, which includes: an isolation seat, a valve core and a second diaphragm. The isolation seat is installed in the second chamber and is located below the connection between the second chamber and the third chamber. A second opening penetrating the isolation seat is longitudinally provided in the middle thereof. The valve core is floatingly connected to the isolation seat and penetrates through the second opening. A first ventilation hole penetrating the valve core is longitudinally provided thereon. The second diaphragm is sleeved on the valve core and is located above the connection between the second chamber and the third chamber. Its shape and size are adapted to the shape and size of the cross-section of the second chamber perpendicular to the longitudinal direction to divide the second chamber into a first cavity and a second cavity along the longitudinal direction. The first cavity communicates with the second cavity through the first ventilation hole. The second diaphragm can drive the valve core to float up and down along the longitudinal direction relative to the second opening through the pressure difference change between the first cavity and the second cavity to change the opening degree between the second opening and the valve core.

2. The premixed air-fuel ratio valve according to claim 1, wherein A first installation groove is provided on the top side of the housing corresponding to the position of the second chamber. The first opening is provided at the bottom of the first installation groove. The side portion of the first installation groove communicates with the third chamber. The first flow rate regulating assembly further includes: An end cover installed on the top side of the housing to close the first installation groove to form the first chamber; A first installation seat installed at the first opening, and a second ventilation hole penetrating the first installation seat and communicating with the first opening is longitudinally provided thereon; and A first floating spring extending along the longitudinal direction, and its two ends are respectively connected to the bottom of the first installation seat and the bottom of the first diaphragm.

3. The premixed air-fuel ratio valve according to claim 2, wherein The first flow rate regulating assembly further includes: A first adjusting screw, a first screw hole penetrating the end cover is longitudinally provided on the top of the end cover, and the first adjusting screw is screwed into the first screw hole; and An adjusting spring extending along the longitudinal direction, and its two ends are respectively connected to the bottom of the first adjusting screw and the top of the first diaphragm.

4. The premixed air-fuel ratio valve according to claim 2, wherein the second flow rate regulating assembly further comprises: a second mounting seat, mounted on the bottom side of the isolation seat, the second mounting seat being a housing having at least one third vent hole opened on its side, the top of the second mounting seat being communicated with the second opening through an opening, and the air inlet being communicated with the second opening and the first chamber through the at least one third vent hole; and a second floating spring, extending longitudinally and having its two ends respectively connected to the valve core and the inner wall of the bottom of the second mounting seat.

5. The premixed air-fuel ratio valve according to claim 2, wherein at least one pipeline interface communicated with the first cavity is opened on the end cover for communicating with the first inlet end of the venturi tube.

6. The premixed air-fuel ratio valve according to any one of claims 1-5, characterized in that, It further comprises: an air intake cut-off assembly, the interior of the outer shell further having a fourth chamber, a second mounting groove penetrating through the outer shell being opened at the top side of the outer shell corresponding to the position of the fourth chamber, the fourth chamber being communicated with the outside of the outer shell through the second mounting groove, the bottom of the fourth chamber being communicated with the second chamber through a third opening, the side of the fourth chamber being communicated with the air inlet, the air intake cut-off assembly penetrating through the second mounting groove and partially located in the fourth chamber, and it comprises: an electromagnetic coil, arranged above the second mounting groove and closing the second mounting groove, the electromagnetic coil being wound and extended longitudinally and electrically connected to a power source; a fixed iron core, placed inside the winding center of the electromagnetic coil and fixed to the end of the electromagnetic coil away from the second mounting groove; a moving iron core, placed inside the winding center of the electromagnetic coil and located below the fixed iron core with a preset distance therebetween; and a closing member, connected to the moving iron core and located below the moving iron core; wherein, the moving iron core can drive the closing member to reciprocate longitudinally relative to the electromagnetic coil through electromagnetic induction to open and close the third opening.

7. The premixed air-fuel ratio valve according to claim 6, wherein the moving iron core is successively divided into a first moving iron core and a second moving iron core from top to bottom longitudinally, and the top of the second moving iron core is connected to the bottom of the first moving iron core through a first compression spring; the closing member is divided into a first closing member and a second closing member, the first closing member is connected to the first moving iron core and located below the second moving iron core, its top abuts against the bottom of the electromagnetic coil through a second compression spring, and the second closing member is connected to the bottom of the second moving iron core.

8. The premixed air-fuel ratio valve according to any one of claims 1-5, characterized in that, It further comprises: an air outlet regulating assembly, mounted in the third chamber, and it comprises: a second adjusting screw, a fourth opening penetrating through the outer shell longitudinally being opened at the top side of the third chamber, and the second adjusting screw penetrates through the fourth opening and is rotatably connected to the bottom of the third chamber; An adjusting member, on which a second screw hole is longitudinally formed through the adjusting member and adapted to the second adjusting screw, and the adjusting member is connected to the second adjusting screw through the second screw hole and can reciprocate longitudinally between a first position and a second position relative to the air outlet; and A pre-tightening spring, sleeved on the second adjusting screw, and both ends thereof are respectively abutted against the inner wall of the top side of the third chamber and the top side of the adjusting member; Wherein, when the adjusting member is in the first position, the adjusting member completely closes the air outlet, and when the adjusting member is in the second position, the adjusting member completely exposes the air outlet.

9. The premixed air-fuel ratio valve according to claim 8, wherein A limiting rib adapted to the outer dimension of the adjusting member is provided at the position of the third chamber corresponding to the adjusting member.

10. A cooking appliance, characterized in that, Comprising: The premixed air-fuel ratio valve according to any one of claims 1-9.

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