CN218209553U

CN218209553U - Premixer, combustion device and gas water heating equipment

Info

Publication number: CN218209553U
Application number: CN202221845737.XU
Authority: CN
Inventors: 卢宇轩; 余浩伦; 张锦梁
Original assignee: Guangdong Wanhe Thermal Energy Technology Co Ltd
Current assignee: Guangdong Wanhe Thermal Energy Technology Co Ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2023-01-03
Anticipated expiration: 2032-07-18

Abstract

The utility model belongs to the technical field of the gas heat supply, a premixer, burner and gas hot water equipment is specifically disclosed. The premixer includes: the gas outlet device comprises a shell, a gas outlet channel, a first premixing cavity and a second premixing cavity, wherein the first premixing cavity and the second premixing cavity are separated from each other; the outlet blocking and sealing unit is provided with a blocking state for blocking the first air outlet from being communicated with the air outlet channel and an opening state for enabling the first air outlet to be communicated with the air outlet channel; import keeps off and seals the unit, keeps off when sealing the unit and being in the shutoff state when exporting, and import keeps off and seals the first gas import of unit shutoff, keeps off when sealing the unit and being in the open mode when exporting, and import keeps off and seals the unit and can open first gas import. The utility model discloses a premixer, burner and gas hot water system can increase burner and gas hot water system's power control range, compromise high-power user demand and miniwatt user demand, improve and use the flexibility and use experience.

Description

Premixer, combustion device and gas water heating equipment

Technical Field

The utility model relates to a gas heat supply technical field especially relates to a premixer, burner and gas hot water supply equipment.

Background

Gas water heating equipment such as a gas water heater, a gas wall-mounted boiler and the like all adopt a combustion device to combust gas so as to supply heat energy required by water heating. The gas combustion is generally divided into diffusion combustion, partial premixed combustion and full premixed combustion, wherein the full premixed combustion refers to a process of fully mixing air and gas in advance according to a certain proportion to form premixed air, and then igniting and combusting the premixed air in a combustor.

Along with the gradual improvement of the heat supply quality requirements of people on the gas water heating equipment, the gas water heating equipment is required to have finer power control, so that the gas water heating equipment is required to have larger broadband power regulation to meet the requirements of users on different powers. The premixer is an important component in the fully premixed gas water heating equipment for adjusting the stability of the equivalence ratio of gas and air and influencing the load regulation ratio, and the structure and the performance of the premixer directly influence the load regulation range of the gas water heating equipment.

The larger the load adjustment range of the gas water heating equipment is, the better the user experiences the heat supply, however, the adjustment range of the common premixer is smaller. In the prior art, in order to ensure that the premixer can better work efficiency in different power models, premixers with different mixing calibers can be set for matching use. However, as the mixing caliber of the premixer is fixed, the load regulation ratio under different power operation is also fixed, so that when a high-power machine type is used, although the high-power output requirement can be obtained, the lower-power output requirement cannot be obtained; when a small-power machine type is used, although a small power requirement can be obtained, a large-power output requirement cannot be obtained, so that the ultra-wideband load regulation which simultaneously meets the large-power output requirement and the small-power requirement is difficult to realize by a user, and the use experience of the user is difficult to improve; meanwhile, the use of a plurality of premixers also increases the overall cost of the gas water heater.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem one of will provide a premixer to solve the problem that present premixer is difficult to satisfy high-power user demand and miniwatt user demand simultaneously, increase the load control range of premixer, and reduce the use cost of premixer.

The utility model discloses the second of the technical problem who solves provides a burner to solve current burner and be difficult to satisfy the problem of high-power user demand and miniwatt user demand, increase burner's load control range, and reduce burner's use cost.

The utility model discloses the third technical problem who solves is to provide a gas hot water system to solve current gas hot water system and be difficult to satisfy the problem of high-power user demand and miniwatt user demand simultaneously, increase gas hot water system's power control scope, and reduce gas hot water system's cost.

The first technical problem is solved by the following technical scheme:

a premixer, comprising:

the gas outlet device comprises a shell, wherein an air outlet channel and a first premixing cavity and a second premixing cavity which are separated from each other are arranged in the shell, the first premixing cavity is provided with a first gas inlet, a first air inlet and a first air outlet, the second premixing cavity is provided with a second gas inlet, a second air inlet and a second air outlet, the first air outlet and the second air outlet can be communicated with the air outlet channel, and the minimum cross-sectional area of the first premixing cavity is different from the minimum cross-sectional area of the second premixing cavity;

the outlet blocking unit is provided with a blocking state for blocking the first air outlet from being communicated with the air outlet channel and an opening state for enabling the first air outlet to be communicated with the air outlet channel, and the outlet blocking unit is controlled to be switched between the opening state and the blocking state;

and the inlet blocking and sealing unit blocks the first gas inlet when the outlet blocking and sealing unit is in the blocking state, and the inlet blocking and sealing unit can open the first gas inlet when the outlet blocking and sealing unit is in the opening state.

Premixer, compare with the background art, the beneficial effect who has is: by arranging the first premixing cavity and the second premixing cavity with different minimum cross-sectional areas and selectively plugging the first air outlet through the outlet blocking unit, the premixer can have a single-channel conduction mode and a double-channel conduction mode, so that the load adjusting range of the premixer is larger compared with that of a premixer with only one premixing cavity, high-power combustion and low-power combustion can be better considered, and the use experience of the premixer is improved; meanwhile, the use requirements under two modes can be met by adopting one premixer, and compared with a mode of adjusting power by adopting a plurality of premixers, the cost is lower, and the universality is stronger; and when the premixer is in a single-channel conduction mode, the first gas inlet and the first gas outlet are blocked, air and/or gas can be effectively prevented from entering the first premixing cavity, the air pressure of the fan and the gas injection pressure are effectively guaranteed to only act on the second premixing cavity, the air and gas premixing effect in the second premixing cavity is guaranteed in the single-channel conduction mode, the problem that the gas pressure in the first premixing cavity is overlarge due to the fact that the air and/or the gas enters the first premixing cavity is also avoided, and the use safety and the reliability of the premixer are improved.

In one embodiment, the minimum cross-sectional area of the first premix chamber is greater than the minimum cross-sectional area of the second premix chamber;

and/or the first premixing cavity is a first venturi tube structure with two large ends and a small middle part, the two ends of the first premixing cavity respectively form the first air inlet and the first air outlet, and the first gas inlet is arranged at the necking part of the first venturi tube structure;

and/or, the second mixes the chamber in advance for the big, the middle little second venturi structure in both ends, the both ends that the chamber was mixed in advance to the second form respectively the second air inlet with the second gas outlet, the second gas inlet is seted up the necking down department of second venturi structure.

In one embodiment, the premixer further comprises a premixing pipe, the premixing pipe is inserted into the shell in a sealing manner, and a gas inlet cavity is formed by the outer side wall of the premixing pipe and the inner side wall of the shell in a surrounding manner;

the premixing pipe is internally provided with the first premixing cavity and the second premixing cavity, the air outlet channel is formed in the shell, and the first fuel gas inlet and the second fuel gas inlet are communicated with the fuel gas inlet cavity.

In one embodiment, the premixer further comprises an air outlet seat, the air outlet seat is connected to the first air outlet in a sealing manner, the air outlet seat is provided with a communication port communicated with the first air outlet, and the outlet blocking unit can block the communication port to be in the blocking state or open the communication port to be in the opening state.

In one embodiment, the air outlet seat has an air outlet groove opening towards the first air outlet, the communication port is arranged at one groove side wall of the air outlet groove, and the air outlet groove has a guide groove wall which inclines towards the direction towards the communication port and away from the first air outlet;

and/or the air outlet direction of the first air outlet is vertical to the air outlet direction of the communication port;

and/or, first premix chamber with the equal first direction in second premix chamber extends, first premix chamber with the second premix chamber is along the second direction side by side and separate the setting, the direction of giving vent to anger of intercommunication mouth sets up along the third direction, first direction the second direction reaches third direction mutually perpendicular, export keep off and seal the unit and can follow the third direction action is in order to shutoff or to open the intercommunication mouth.

In one embodiment, the outlet blocking unit comprises an outlet solenoid valve, a valve body of the outlet solenoid valve is hermetically mounted on the housing, and a valve rod end of the outlet solenoid valve can extend into the air outlet channel and block the communication between the first air outlet and the air outlet channel.

In one embodiment, the air inlet end of the premix tube is exposed out of the shell, a limiting groove is formed in the end face of the air inlet end of the shell, a limiting plate extends from the outer wall of the premix tube in the radial direction, and the limiting plate is inserted into the limiting groove;

and/or, a limit screw is screwed on the outer wall of the air inlet end of the shell, the limit screw extends along the axial direction of the shell, a sealing ring platform is arranged on the outer peripheral wall of the air inlet end of the premixing pipe in a protruding mode, the sealing ring platform is connected with the inner wall of the shell in a sealing mode, and the screw head of the limit screw is pressed against the outer end face of the sealing ring platform.

In one embodiment, two limiting plates are arranged at intervals along the circumferential direction of the premixing pipe, and the included angle between the two limiting plates is not equal to 180 degrees;

and/or at least two limiting plates are arranged along the circumferential direction of the premix pipe, and the shape and/or the size of the at least two limiting plates are different.

The second technical problem is solved by the following technical solutions:

the utility model provides a combustion apparatus, includes combustor and fan, be provided with a plurality of fire holes on the combustor, its characterized in that still includes as above premixer, the end of giving vent to anger of outlet channel with the air intake intercommunication of fan, the air outlet of fan with fire hole intercommunication.

Burner, compare with the background art, the beneficial effect who has is: through adopting above-mentioned premixer to realize the premixing of gas and air, can improve burner load control range for burner can satisfy miniwatt user demand and high-power user demand better, reduces burner's cost simultaneously.

In one embodiment, the combustor is internally provided with a first mixing cavity and a second mixing cavity which are separated, and the fire hole comprises a plurality of first fire holes communicated with the first mixing cavity and a plurality of second fire holes communicated with the second mixing cavity;

the combustion device further comprises a gas transmission assembly and an on-off control unit, the gas transmission assembly is connected between the air outlet of the fan and the combustor, the gas transmission assembly is provided with a gas transmission channel communicated with the air outlet, the gas transmission channel is communicated with the second mixing cavity, and the on-off control unit is provided with a conduction state enabling the first mixing cavity to be communicated with the gas transmission channel and a blocking state blocking the first mixing cavity to be communicated with the gas transmission channel.

In one embodiment, the burner comprises a main cylinder and a partition, the partition is positioned inside the main cylinder and divides an inner cavity of the main cylinder into the second mixing cavity and the first mixing cavity which are vertically partitioned, and the side wall of the main cylinder is provided with the first fire hole and the second fire hole;

the partition is provided with a communication channel extending along the axis of the main cylinder, the lower end of the communication channel is communicated with the first mixing cavity, and the on-off control unit can enable the upper end of the communication channel to be selectively communicated with the gas transmission channel.

In one embodiment, the partition comprises a partition plate and a communication pipe which are connected, the partition plate is connected with the inner wall of the main cylinder, the communication pipe is vertically connected above the partition plate and is provided with a communication channel which penetrates through the partition plate, the second mixing chamber is positioned between the outer wall of the communication pipe and the inner wall of the main cylinder, and the first mixing chamber is positioned below the partition plate;

and/or the combustor further comprises an air inlet end plate arranged at the upper end of the main cylinder body, the air inlet end plate is provided with a first mixed gas inlet communicated with the communicating channel and a second mixed gas inlet communicated with the second mixing cavity, and the air inlet end plate extends out of the main cylinder body along the radial direction;

and/or a distribution pipe is arranged in the first mixing cavity, the upper end of the distribution pipe is communicated with the communicating channel, the lower end of the distribution pipe is connected with the bottom of the first mixing cavity, a plurality of circles of distribution holes are axially formed in the peripheral wall of the distribution pipe, and each circle of distribution holes comprise a plurality of distribution holes which are circumferentially arranged along the distribution pipe at intervals.

In one embodiment, the gas transmission assembly comprises a gas transmission shell, the gas transmission channel is arranged in the gas transmission shell, an air inlet seat is arranged in the gas transmission shell, the air inlet seat is provided with a first gas transmission outlet and a gas transmission cavity communicated with the first gas transmission outlet and the gas transmission channel, and a second gas transmission outlet is formed in the outer side wall of the gas transmission shell;

the combustor is connected below the gas transmission shell, the first gas transmission outlet can be communicated with the first mixing cavity, and the second gas transmission outlet is communicated with the second mixing cavity;

the on-off control unit is installed on the gas transmission shell, at least part of the on-off control unit extends into the gas transmission cavity and can block the first gas transmission outlet.

Gas hot water system, compare with the background art, the beneficial effect who has does: through adopting above-mentioned burner to realize the gas burning, can improve gas hot water equipment load control range for gas hot water equipment can satisfy miniwatt user demand and high-power user demand better, reduces gas hot water equipment's cost simultaneously.

Drawings

FIG. 1 is a schematic diagram of a premixer according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating an airflow of a premixer in a dual channel conduction mode according to an embodiment of the present invention;

fig. 3 is a schematic diagram of airflow of a premixer in a single-channel conduction mode according to an embodiment of the present invention;

fig. 4 is a schematic view of a disassembly structure of a premixer according to an embodiment of the present invention;

FIG. 5 is a partial sectional view of a premixer according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a premixer according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating an assembly structure of a premix tube and an air outlet seat according to an embodiment of the present invention;

fig. 8 is a schematic structural view of an air outlet seat according to a first embodiment of the present invention;

fig. 9 is a schematic structural diagram of a combustion apparatus provided in the second embodiment of the present invention;

fig. 10 is a partial cross-sectional view of a combustion apparatus according to a second embodiment of the present invention;

fig. 11 is a schematic structural diagram of a combustion apparatus provided in the second embodiment of the present invention in a first operation mode;

fig. 12 is a schematic structural diagram of a combustion apparatus provided in the second embodiment of the present invention in a second operation mode;

fig. 13 is a schematic structural diagram of a burner according to a second embodiment of the present invention;

fig. 14 is a schematic partial structural view of a combustion apparatus according to a second embodiment of the present invention;

fig. 15 is a schematic structural view of the main gas transmission member according to the second embodiment of the present invention.

Description of reference numerals:

1. a premixer; 11. a housing; 111. a housing main body; 112. a gas inlet joint; 1121. a gas inlet channel; 113. a valve seat portion; 114. a stud portion; 115. a flange disc portion; 116. a limiting groove; 117. an air outlet channel; 118. a gas inlet cavity; 12. a premix tube; 121. a first premix tube section; 1211. a first premix chamber; 1212. a first air inlet; 1213. a first air outlet; 1214. a first gas inlet; 122. a second premix tube section; 1221. a second premix chamber; 1222. a second air inlet; 1223. a second air outlet; 1224. a second gas inlet; 123. a partition plate portion; 124. an intake pipe portion; 125. an air outlet pipe part; 126. sealing the ring table; 127. a nozzle holder; 128. a limiting plate; 129. a sealing groove; 1210. a connection post portion; 13. an air outlet seat; 131. a base body; 1311. an air outlet groove; 1312. a communication port; 1313. a guide slot wall; 132. a cover plate portion; 133. a convex ring part; 14. an inlet blocking unit; 141. a baffle plate; 1411. a plugging section; 1412. a rotation shaft portion; 1413. a main plate portion; 142. a rotating shaft; 15. an outlet blocking unit; 16. a first nozzle; 17. a second nozzle; 18. a seal ring; 19. a limit screw;

2. a burner; 21. a main cylinder; 211. a first mixing chamber; 212. a second mixing chamber; 213. a first fire hole; 214. a second fire hole; 22. a partition plate; 221. a vent; 23. a communicating pipe; 231. a communication channel; 24. a distribution pipe; 241. a dispensing aperture; 25. an air inlet end plate; 251. an intake plate portion; 2511. a first mixed gas inlet; 2512. a second mixed gas inlet; 252. a connecting ring portion; 253. a connecting plate portion;

3. a fan;

4. a gas delivery assembly; 41. a primary gas transfer member; 411. a gas delivery shell; 4111. a gas delivery pipe portion; 4112. a gas delivery disk portion; 4113. a second gas delivery outlet; 412. an air inlet seat; 4121. an air delivery cavity; 4122. a first gas delivery outlet; 413. a gas transmission channel; 414. an air cavity; 42. a sealing cover; 43. a transfer joint; 44. a seal member;

5. and an on-off control unit.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.

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

In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example one

As shown in fig. 1, the present embodiment provides a premixer 1, which can be applied to a combustion apparatus of a gas water heater for realizing premixing of air and gas, so as to supply a mixture gas with a certain air-fuel ratio to a burner in the combustion apparatus for realizing combustion. The utility model provides a premixer mixes ware in advance for mixing the formula in advance completely, in premixing ware 1, the air carries out abundant premixing with the gas to make the combustion flame propagation speed in burner of burner fast, the combustion chamber volume heat intensity is very high, and can reach complete combustion under few surplus air coefficient.

Specifically, as shown in fig. 1 to 5, the premixer 1 includes a casing 11, an inlet dam unit 14, and an outlet dam unit 15. Wherein, the housing 11 has a first premix chamber 1211 and a second premix chamber 1221 separated from each other, the first premix chamber 1211 has a first gas inlet 1214, a first air inlet 1212 and a first air outlet 1213, the second premix chamber 1221 has a second gas inlet 1224, a second air inlet 1222 and a second air outlet 1223, and the minimum cross-sectional area of the first premix chamber 1211 is different from the minimum cross-sectional area of the second premix chamber 1221; the outlet blocking unit 15 has a blocking state for blocking the first air outlet 1213 from communicating with the air outlet channel 117 and an opening state for allowing the first air outlet 1213 to communicate with the air outlet channel 117, and the outlet blocking unit 15 is controllably switched between the opening state and the blocking state;

and when the outlet blocking unit 15 is in the blocking state, the inlet blocking unit 14 blocks the first gas inlet 1214, and when the outlet blocking unit 15 is in the opening state, the inlet blocking unit 14 can open the first gas inlet 1214.

In the premixer 1 provided in this embodiment, by providing the first premix chamber 1211 and the second premix chamber 1221 having different minimum cross-sectional areas and providing the outlet blocking unit 15 capable of selectively blocking the first air outlet 1213, the premixer 1 can have two mixing modes: a single channel conduction mode and a dual channel conduction mode. When the first air outlet 1213 is blocked by the outlet blocking unit 15, only the second air outlet 1223 is communicated with the air outlet channel 117, that is, only the second premixing cavity 1221 plays a role of air mixing, and at this time, the premixer 1 is in a single-channel conduction mode; when the first air outlet 1213 and the first gas inlet 1214 are both opened, the first air outlet 1213 and the second air outlet 1223 are both communicated with the air outlet channel 117, that is, the first premixing chamber 1211 and the second premixing chamber 1221 both perform the air and gas mixing function, and the premixer 1 is in the two-channel conduction mode.

In practical applications, when the adjustment ratio of the fan is constant, for example, both the adjustment ratios are calculated as 1. When the minimum cross-sectional areas of the two premixing chambers are different, the maximum load value of each premixing chamber is different, and assuming that the maximum load values are respectively 10kW and 20kW, the total maximum load value of the two premixing chambers is 30kW, the minimum load value is 10/5=2kW, and the load regulation ratio of the premixer 1 is 30/2, namely 15/1.

That is, in the present embodiment, it is assumed that the adjustment ratio of the fan is 1: k, if the maximum load value of the first premix chamber 1211 is P1, the minimum load value is P1/K; the maximum load value of the second premix chamber 1221 is P2, and the minimum load value is P2/K. When the premixer 1 is in a single-channel conduction mode, the minimum load value of the premixer 1 is P1/K, the maximum load value is P1, and the load regulation ratio is as follows: P1/(P1/K) = K; when the premixer 1 is in the dual-channel conduction mode, the total maximum load value of the premixer 1 is P1+ P2, and the total minimum load value is (P1 + P2)/K, then the load regulation ratio of the premixer 1 is a = (P1 + P2)/(P1/K) = K + P2K/P1.

That is, in this embodiment, by setting the first premix chamber 1211 and the second premix chamber 1221 having different minimum cross-sectional areas and selectively blocking the first air outlet 1213 by the outlet blocking unit 15, the premixer 1 can have a single-channel conduction mode and a dual-channel conduction mode, so that the load adjustment range of the premixer 1 is wider than that of a premixer 1 having only one premix chamber, which is more favorable for both high power combustion and low power combustion, and improves the use experience of the premixer 1; meanwhile, the use requirements under two modes can be met by adopting one premixer 1, compared with a mode of adjusting power by adopting a plurality of premixers 1, the cost is lower, and the universality is stronger; and when the premixer 1 is in the single-channel conducting mode, the first gas inlet 1214 and the first gas outlet 1213 are both blocked, which can effectively avoid the air and/or gas from entering the first premixing chamber 1211, effectively ensure that the air pressure of the fan and the gas injection pressure only act on the second premixing chamber 1221, ensure the air and gas premixing effect in the second premixing chamber 1221 in the single-channel conducting mode, also avoid the problem of the excessive gas pressure in the first premixing chamber 1211 caused by the air and/or gas entering the first premixing chamber 1211, and improve the safety and reliability of the premixer 1.

Preferably, the minimum cross-sectional area of the first premix chamber 1211 is greater than the minimum cross-sectional area of the second premix chamber 1221, and since the minimum cross-sectional area of the premix chamber is in a positive correlation with the maximum load value, if P1 > P2, the load regulation ratio a = K + P2K/P1 > 2K, and thus the load regulation ratio of the premixer 1 can be increased to the maximum extent, so as to increase the load regulation range, reduce the minimum power that the premixer 1 can output, and further meet the low-power use requirements of the premixer 1 and the combustion apparatus.

In an embodiment, the first premixing chamber 1211 is a first venturi tube structure with two large ends and a small middle part, the two ends of the first premixing chamber 1211 form a first air inlet 1212 and a first air outlet 1213, respectively, and the first gas inlet 1214 opens at a constriction of the first venturi tube structure; and/or the second premixing cavity 1221 is a second venturi tube structure with two large ends and a small middle, a second air inlet 1222 and a second air outlet 1223 are respectively formed at two ends of the second premixing cavity 1221, and the second fuel gas inlet 1224 is arranged at the necking position of the second venturi tube structure.

By arranging the first premixing chamber 1211 and the second premixing chamber 1221 in a venturi structure, the air flow can be accelerated when passing through the constriction of the venturi structure, and meanwhile, because the gas inlets (the first gas inlet 1214 and the second gas inlet 1224) are arranged at the constriction of the venturi structure, the accelerated air flow at the constriction can generate negative pressure at the gas inlets, thereby better promoting the gas to be injected into the corresponding first premixing chamber 1211 or the second premixing chamber 1221 through the gas inlets, and enhancing the mixing uniformity of the gas and the air.

It can be understood that the minimum cross-sectional area of the first pre-mixing chamber 1211 and the minimum cross-sectional area of the second pre-mixing chamber 1221 can be set according to the actual load regulation ratio requirement of the gas water heater, which is not limited by the present invention.

As shown in fig. 4 to 6, in order to improve the processing convenience of the premixer 1, the premixer 1 further includes a premixer tube 12 located inside the housing 11, the premixer tube 12 is hermetically inserted inside the housing 11, a first premixer chamber 1211 and a second premixer chamber 1221 are formed inside the premixer tube 12, and an air outlet passage 117 is formed inside the housing 11 outside the premixer tube 12. Through setting up casing 11 and premix pipe 12, can make premix pipe 12 and casing 11 process alone, improve the processing convenience of premix pipe 12, and can be on the unchangeable basis of casing 11, obtain the premixer 1 of different load turndown ratios through setting up different premix pipes 12, improve casing 11's commonality.

The premixing pipe 12 comprises a partition part 123, and a first premixing pipe part 121 and a second premixing pipe part 122 respectively located at two opposite sides of the partition part 123, wherein the first premixing pipe part 121 and the partition part 123 surround to form a first premixing cavity 1211 with two open ends, namely a first air inlet 1212 and a first air outlet 1213; the second premix pipe portion 122 and the partition portion 123 enclose to form a second premix chamber 1221 with two open ends, which are respectively a second air inlet 1222 and a second air outlet 1223, the first air inlet 1212 and the second air inlet 1222 are both located at the air inlet end of the premix pipe 12, the first air outlet 1213 and the second air outlet 1223 are both located at the air outlet end of the premix pipe 12, the first gas inlet 1214 is opened on the circumferential wall of the first premix pipe portion 121, and the second gas inlet 1224 is opened on the circumferential wall of the second premix pipe portion 122.

For convenience of description, a flow direction of air in the first premix chamber 1211 is set to a first direction, and a direction perpendicular to the partition portion 123 is set to a second direction, the first direction and the second direction being perpendicular.

First premix pipe portion 121 and second premix pipe portion 122 all include the import pipeline section that connects gradually along the first direction, necking section and export pipeline section, the cross-sectional area of import pipeline section and export pipeline section on perpendicular to the first direction all along the direction taper towards necking section, the cross-sectional area everywhere of necking section equals and is the same with the minimum cross-sectional area of import pipeline section and export pipeline section, first gas inlet 1214 has been seted up to the necking section department of first premix pipe portion 121, second gas inlet 1224 has been seted up to the necking section department of second premix pipe portion 122.

Preferably, the aeration area of the first gas inlet 1214 is larger than the aeration area of the second gas inlet 1224, so that the first premix chamber 1211, which has a relatively large minimum cross-sectional area, can inject more gas than the second premix chamber 1221, better meeting the air and gas mixing requirement.

The casing 11 includes a cylindrical casing main body 111 with openings at two ends, the premix tube 12 is hermetically inserted into the casing main body 111, a gas inlet cavity 118 is formed between the outer wall of the premix tube 12 and the inner wall of the casing main body 111, and the first gas inlet 1214 and the second gas inlet 1224 are both communicated with the gas inlet cavity 118. A gas inlet joint 112 is convexly arranged on the outer peripheral wall of the shell main body 111, and a gas inlet channel 1121 communicated with the gas inlet cavity 118 is formed in the gas inlet joint 112. By arranging the gas inlet cavity 118 and the gas inlet joint 112, external gas supply equipment can be connected with the gas inlet joint 112, so that gas supply to the premixer 1 is realized; and the fuel gas provided by the external fuel gas supply device enters the fuel gas inlet cavity 118 through the fuel gas inlet channel 1121, and is distributed to the first premixing cavity 1211 and/or the second premixing cavity 1221 through the fuel gas inlet cavity 118, so that the fuel gas inlet convenience of the first premixing cavity 1211 and the second premixing cavity 1221 is improved.

The nozzle holder 127 extends radially from the outer circumferential wall of the neck portion of each of the first and second

premix tube portions

121 and 122, a mounting cavity communicating with the corresponding first gas inlet 1214 or second gas inlet 1224 is provided in the nozzle holder 127, a nozzle is mounted in the mounting cavity, the gas inlet of the nozzle is communicated with the gas inlet cavity 118, and the gas nozzle of the nozzle is communicated with the corresponding first gas inlet 1214 or second gas inlet 1224. By arranging the nozzle, the speed of the gas injected from the gas inlet cavity 118 to the first premixing cavity 1211 or the second premixing cavity 1221 can be increased, which is beneficial to improving the effect of mixing the gas and the air.

The nozzle communicating with the first gas inlet 1214 is a first nozzle 16, the nozzle communicating with the second gas inlet 1224 is a second nozzle 17, and the gas orifice diameter of the first nozzle 16 is larger than the gas orifice diameter of the second nozzle 17.

In order to improve the convenience of connecting the pre-mixing pipe 12 and the housing 11, the pre-mixing pipe 12 further includes a cylindrical air inlet pipe portion 124, and the first end of the first pre-mixing pipe portion 121 and the first end of the second pre-mixing pipe 12 are both connected to the air outlet end of the air inlet pipe portion 124, so that the air entering from the air inlet end of the air inlet pipe portion 124 can be respectively sent to the first pre-mixing chamber 1211 and the second pre-mixing chamber 1221, that is, the air is introduced into the first pre-mixing chamber 1211 and the second pre-mixing chamber 1221 through the same air inlet pipe portion 124. The intake pipe portion 124 is sealingly connected to the inner wall of the housing 11. The pre-mixing pipe 12 further includes a cylindrical outlet pipe portion 125, the second end of the first pre-mixing pipe portion 121 and the second end of the second pre-mixing pipe portion 122 are both connected to the outlet pipe portion 125, and the outlet pipe portion 125 is hermetically connected to the housing 11.

Through setting up out gas pipe portion 125 and inlet pipe portion 124, can improve the convenience of being connected of premixing pipe 12 and casing 11, make things convenient for casing 11 and premix the sealed between the pipe 12, and be favorable to other structures and premix the being connected of pipe 12.

In an embodiment, the outer circumferential walls of the inlet pipe portion 124 and the outlet pipe portion 125 are respectively provided with an annular sealing ring platform 126 in a protruding manner, an annular sealing groove 129 is formed in the sealing ring platform 126, a sealing ring 18 is arranged in the sealing groove 129, the sealing ring platform 126 is attached to the inner wall surface of the housing 11, and the inner wall of the housing 11 extrudes the sealing ring 18, so as to respectively realize the sealing between the inlet pipe portion 124 and the housing 11 and the sealing between the outlet pipe portion 125 and the housing 11. The gas inlet chamber 118 is located between the two sealing rings 18 to avoid gas leakage from the gas inlet chamber 118.

The premixer 1 is preferably provided with a first limit structure, and the first limit structure is used for limiting the depth of the premix tube 12 inserted into the casing 11, so as to better realize the installation positioning and limiting of the premixer 1 and the casing 11, and improve the installation accuracy and the installation convenience. In one embodiment, as shown in fig. 1 to 6, a limiting plate 128 extends outward from an outer wall of the air inlet pipe portion 124, the air inlet end face of the housing 11 is provided with a limiting groove 116, and the limiting plate 128 is inserted into the limiting groove 116, that is, the first limiting structure includes the limiting groove 116 and the limiting plate 128. Due to the arrangement of the first limiting structure, the air inlet pipe portion 124 is partially exposed out of the shell 11, which is beneficial to the detachment of the air inlet pipe portion 124.

The retainer plates 128 are preferably provided at least two at intervals in the circumferential direction of the intake pipe portion 124 to improve the reliability of the retainer. In the present embodiment, two limiting plates 128 are provided, and in other embodiments, a plurality of limiting plates 128 may be provided.

Further, the angle between the two retainer plates 128 is not equal to 180 °, and/or the shape and/or size of at least two retainer plates 128 are different. The arrangement of the limit plate 128 and the limit groove 116 forms a fool-proof structure, which prevents the premixing tube 12 from being assembled in a staggered manner relative to the casing 11 in the circumferential direction, and improves the assembly precision and the assembly convenience of the premixing tube 12 and the casing 11.

The premixer 1 further has a second limiting structure for limiting the premix tube 12 from coming out of the housing 11. In an embodiment, the second limiting structure is a limiting screw 19, a stud portion 114 is convexly disposed on the outer peripheral wall of the housing 11, the stud portion 114 extends along the first direction and is opened with a threaded hole, the limiting screw 19 is screwed into the threaded hole, and a head of the limiting screw 19 is pressed against the outer end surface of the sealing ring platform 126. Preferably, at least two limit screws 19 are arranged at intervals along the circumferential direction of the housing 11 to improve the reliability of the limit, and the stud portions 114 are arranged in one-to-one correspondence with the limit screws 19.

This kind of setting of second limit structure, the dismouting is convenient to can conveniently realize premixing pipe 12 from the inside taking out of casing 11 through lifting off stop screw 19, improve premixing pipe 12 and casing 11's installation and dismantlement convenience. Meanwhile, the relative positions of the premixing pipe 12 and the shell 11 are limited by the first limiting structure and the second limiting structure, so that the situation that the shell 11 and the premixing pipe 12 need to be locked and attached through direct threads can be avoided, and the requirements on the processing difficulty and the processing precision of the premixing pipe 12 are reduced.

In an embodiment, when the outlet blocking unit 15 is in the blocking state, the inlet blocking unit 14 can block the first gas inlet 1214 under the effect of gravity or elastic force, and when the inlet blocking unit 14 is in the open state, the inlet blocking unit 14 can open the first gas inlet 1214 under the effect of the intake pressure of the first premix chamber 1211. This arrangement eliminates the need to provide power to the inlet barrier unit 14, reduces cost, and improves the opening or closing automation of the first gas inlet 1214.

2-5, in one embodiment, first premix chamber 1211 is positioned below second premix chamber 1221 and first fuel gas inlet 1224 is positioned on a side of first premix chamber 1211 facing away from second premix chamber 1221. The inlet blocking unit 14 includes a blocking plate 141, a first end of the blocking plate 141 is provided with a blocking portion 1411, a second end of the blocking plate 141 is higher than the blocking portion 1411, and the second end of the blocking plate 141 is rotatably connected to the inside of the housing 11, so that the blocking portion 1411 can be switched between a first position for blocking the first gas inlet 1214 and a second position for opening the first gas inlet 1214. The inlet blocking unit 14 is configured such that the blocking plate 141 blocks the first gas inlet 1214 by gravity.

In an embodiment, when the blocking portion 1411 is in the first position, the baffle 141 extends obliquely from the first end to the second end in a direction close to the second air inlet 1222. The arrangement is such that the baffle 141 is inclined with respect to the air intake direction of the first premixing chamber 1211, when the first air outlet 1213 is opened, the air flow passage is allowed in the first premixing chamber 1211, the air pressure of the air entering from the first air inlet 1222 acts on the baffle 141, and a rotational moment is applied to the baffle 141, which facilitates the rotation of the second end of the baffle 141 in a direction away from the first gas inlet 1214, so that the baffle 141 rotates from the first position to the second position, thereby reducing the air pressure required to rotate the baffle 141 to the second position. When the first premix chamber 1211 stops entering the air, the baffle 141 returns to the first position under the action of gravity, so that the blocking portion 1411 blocks the first gas inlet 1214. In another embodiment, the baffle 141 may also be perpendicular with respect to the air intake direction of the first premix chamber 121.

The baffle plate 141 preferably further includes a rotation shaft portion 1412 and a main plate portion 1413, the main plate portion 1413 is connected between the rotation shaft portion 1412 and the blocking portion 1411, the rotation shaft portion 1413 is rotatably connected to the premix tube 12, and the rotation shaft portion 1413 is horizontally disposed between the first air inlet 1212 and the second air inlet 1222. With this arrangement, it is possible to improve the convenience of installation of the baffle 141, and to reduce the air feeding of the baffle 141 to the second premix chamber 1221 and the first premix chamber 1211, reducing interference. In other embodiments, the rotating shaft portion 1412 may be located entirely within the first premix chamber 121.

In one embodiment, the inner wall of the air inlet pipe portion 124 is provided with a rotating shaft 142, the rotating shaft 142 is preferably located just upstream of the partition portion 123 and parallel to the partition portion 123, and the rotating shaft portion 1412 is rotatably sleeved on the rotating shaft 142, so that the rotating installation of the baffle plate 141 is facilitated. The main plate portion 1413 is preferably a plate-shaped structure disposed at an angle to the barrier portion 123 to increase the area of the baffle 141 on which the airflow pressure acts, thereby improving the reliability of the baffle 141 opening from the first position to the second position.

In order to better promote the baffle 141 to be located at the first position under the action of gravity, the thickness of the blocking portion 1411 is greater than that of the main plate portion 1413, so that the weight increasing effect on the first end of the baffle 141 can be achieved, the center of gravity of the whole baffle 141 moves to the position of the blocking portion, and the first end of the baffle 141 falls back to the position for blocking the first fuel gas inlet 1214 under the action of gravity is facilitated.

In an embodiment, the inlet blocking unit 14 further includes an elastic member for keeping or restoring the blocking plate 141 to the first position, thereby improving the reliability of the inlet blocking unit 14 for blocking the first gas inlet 1214. In another embodiment, the flap 141 can be in the first position or be returned to the first position from the second position only by the elastic force of the elastic member, without considering the influence of gravity on the rotation of the flap 141.

The baffle 141 is preferably made of an elastic material, such as a rubber material or a silica gel material, which is beneficial to achieve the sealing performance of the sealing part 1411 and the end face where the first gas inlet 1214 is located. Preferably, the inner wall of the necking part where the first gas inlet 1214 is located is provided with a blocking plane, the first gas inlet 1214 penetrates through the blocking plane, and the blocking part 1411 can be attached to the blocking plane to improve the blocking effect of the blocking part 1411 on the first gas inlet 1214.

In one embodiment, to install the rotating shaft 142, two shaft holes are formed through the air inlet pipe portion 124, two ends of the rotating shaft 142 are inserted into the shaft holes, and the end of the rotating shaft 142 is preferably located outside the housing 11, so as to facilitate the insertion or extraction of the rotating shaft 142 from the outside of the connecting pipe portion.

As shown in fig. 6 to 8, in an embodiment, the premixer 1 further includes an air outlet seat 13, the air outlet seat 13 is connected to the first air outlet 1213 in a sealing manner, and a communication port 1312 communicating with the first air outlet 1213 is opened on the air outlet seat 13, and the outlet blocking unit 15 can block the communication port 1312 to enable the outlet blocking unit 15 to be in a blocking state, or open the communication port 1312 to enable the outlet blocking unit 15 to be in an open state. The setting of the air outlet seat 13 can change the size and/or the outlet orientation of the communication port 1312 on the premise that the size of the premixing pipe 12 is not changed, thereby reducing the design requirement on the outlet blocking and sealing unit 15, improving the convenience of blocking and conducting the first air outlet 1213 and the air outlet channel 117 by the outlet blocking and sealing unit 15, and facilitating the realization of the overall structure layout in the premixing pipe 12.

The air outlet direction of the first air outlet 1213 is perpendicular to the air outlet direction of the communication port 1312, which is beneficial to reducing the size of the premixer 1 in the first direction and improving the compactness. Further, preferably, the axis of the communication port 1312 is arranged along a third direction, and the outlet blocking unit 15 is capable of acting along the third direction to block or open the communication port 1312, and the third direction is perpendicular to both the first direction and the second direction, so that the size of the premixer 1 in the first direction can be reduced, and the outlet blocking unit 15 is prevented from interfering with the air outlet of the second premix chamber 1221.

In one embodiment, the outlet seat 13 has an outlet groove 1311 opening toward the first outlet port 1213, the communication port 1312 opens at one groove side wall of the outlet groove 1311, and the outlet groove 1311 has a guide groove wall 1313, and the guide groove wall 1313 is inclined in a direction toward the communication port 1312 toward a direction away from the first outlet port 1213. With such an arrangement, the guide groove wall 1313 can provide guidance for the air flow from the first air outlet 1213 to the communication port 1312, so as to improve the smoothness of the air flow and reduce the resistance to the air flow. The outlet seat 13 has an outer side surface parallel to the guide side wall so as to be smaller in size than the outlet seat 13.

The air outlet base 13 further comprises a stop side plate parallel to the partition part 123, the stop side plate is connected with one side of the guide groove wall 1313 and coplanar with the partition part 123, and the main structure of the air outlet base 13 is located on one side, away from the second air outlet 1223, of the stop side plate, so that the influence of the arrangement of the air outlet base 13 on the communication between the second air outlet 1223 and the air outlet channel 117 can be reduced, and the resistance and noise of air flow when the air flow flows to the air outlet channel 117 from the second premixing cavity 1221 are reduced.

In one embodiment, the outlet seat 13 includes a seat body 131 and a sealing plate portion 132, the seat body 131 is provided with the outlet groove 1311 and the communication port 1312, and the sealing plate portion 132 extends outwardly along the open end of the seat body 131 to seal off the portion of the first outlet 1213 located outside the seat body 131 and facilitate the connection between the outlet seat 13 and the premix tube 12.

In this embodiment, the air outlet seat 13 and the pre-mixing pipe 12 are connected by using connecting screws to improve the connection stability. Illustratively, the connecting column portion 1210 is convexly arranged on the tube wall of the pre-mixing tube 12 along the first direction, the connecting column portion 1210 is provided with a connecting threaded hole, the sealing plate portion 132 is provided with a connecting through hole, the connecting through holes correspond to the connecting threaded holes one to one, and the air outlet seat 13 is connected with the pre-mixing tube 12 through the connecting screws penetrating through the connecting threaded holes and the connecting through holes. Preferably, two connection screws are provided, and the two connection screws are respectively provided at opposite sides of the holder body 131 to improve connection stability and reliability.

In this embodiment, a connection post portion 1210 is protruded from both the inner wall of the first pre-mix pipe portion 121 and the inner wall of the second pre-mix pipe portion 122, and a projection of the connection post portion 1210 on a plane perpendicular to the first direction is located within a projection range of the corresponding constricted section on the plane, so as to reduce an influence of the arrangement of the connection post portion 1210 on the airflow.

In an embodiment, the outlet blocking unit 15 includes an outlet solenoid valve, a valve body of the outlet solenoid valve is mounted on the housing 11, a valve rod of the outlet solenoid valve extends along the third direction, and the first end of the valve rod extends into the air outlet channel 117, and a valve plate is disposed at a terminal end of the valve rod of the outlet solenoid valve, and the valve plate can block the communication port 1312 or open the communication port 1312. The specific structure of export solenoid valve can refer to the structure of current solenoid valve, this not the utility model discloses a key, here is no longer repeated.

In order to improve the sealing performance of the outlet solenoid valve for sealing the communication port 1312, the outlet seat 13 further includes a convex ring portion 133 provided around the communication port 1312, and the valve plate abuts against the convex ring portion 133. The air outlet seat 13 is preferably made of an elastic material such as rubber or silicone rubber, so as to realize sealing performance for sealing the communication port 1312 by pressing and deforming the convex ring portion 133 by the valve plate.

In order to better realize the installation of the outlet solenoid valve, as shown in fig. 2-4, a valve seat portion 113 is protruded from the outer surface of the housing main body 111, the valve seat portion 113 is penetrated by a valve installation port communicated with the air outlet channel 117, the valve body is hermetically installed on the valve seat portion 113, and the valve rod extends into a communication port 1312 through the valve installation port.

In order to better realize the connection between the premixer 1 and the blower, the air outlet end of the casing main body 111 extends radially outward to form a flange disk portion 115, the flange disk portion 115 is provided with fixing holes, the fixing holes are used for penetrating fasteners, and a plurality of fixing holes are preferably arranged at intervals along the circumferential direction of the flange disk portion 115.

Example two

As shown in fig. 9 and 10, an embodiment of the present invention provides a combustion apparatus, which can be applied to a gas water heater for supplying a mixed gas of gas and air having a certain air-fuel ratio and igniting the mixed gas.

The combustion apparatus provided by the embodiment comprises a combustor 2, a premixer 1, a fan 3 and a gas transmission assembly 4. The premixer 1 is used for premixing air and gas to convey mixed gas to the combustor 2, and an air outlet channel of the premixer 1 is communicated with an air inlet of the fan 3; the combustor 2 is provided with a mixing cavity and a plurality of fire holes communicated with the mixing cavity, and the gas transmission assembly 4 is connected between the air outlet of the fan 3 and the air inlet of the mixing cavity of the combustor 2 so as to input and distribute mixed gas to the combustor 2; the mixed gas entering the burner 2 flows out of the burner 2 through the fire holes to realize ignition combustion.

In this embodiment, the premixer 1 adopts the structure of the premixer 1 provided in the first embodiment, and the structure of the premixer 1 is not described in detail in this embodiment.

The fan 3 comprises a volute and fan blades arranged in the volute, an airflow cavity is formed in the volute, and an air inlet of the airflow cavity is an air inlet of the fan 3. The flange plate part 115 of the premixer 1 is attached to and detachably connected with one end face of the volute.

In one embodiment, the burner 2 has a first mixing chamber 211 and a second mixing chamber 212 separated from each other, and the fire holes include a plurality of first fire holes 213 communicating with the first mixing chamber 211 and a plurality of second fire holes 214 communicating with the second mixing chamber 212. The gas transmission component 4 has a gas transmission channel 413 communicated with the air outlet, and the gas transmission channel 413 is communicated with the second mixing cavity 212. The combustion apparatus further includes an on-off control unit 5, and the on-off control unit 5 has a conduction state of communicating the first mixing chamber 211 with the gas delivery passage 413 and a blocking state of blocking the communication of the first mixing chamber 211 with the gas delivery passage 413.

As shown in fig. 11 and 12, the combustion apparatus according to the present embodiment can realize three operation modes by the structural arrangement of the combustor 2 and the premixer 1:

(1) A first operation mode: when the first air outlet 1213 is not communicated with the air outlet channel 117 and the air delivery channel 413 is only communicated with the second mixing cavity 212, the mixed air flows from the second premixing cavity 1221 to the second mixing cavity 212 through the air outlet channel 117, the inner channel of the fan 3 and the air delivery channel 413 in sequence, and is ignited and combusted through the second fire hole 214 communicated with the second mixing cavity 212. In this operation mode, since the second premixing chamber 1221 can allow a low-load operation condition and the outflow of the mixture gas only exists at the second fire holes 214 of the burner 2, the number of fire holes being used of the burner 2 can be adapted to the content of the mixture gas passing through the second premixing chamber 1221, thereby better realizing low-power combustion of the combustion apparatus, and better maintaining combustion stability and better combustion thermal efficiency.

(2) A second operation mode: when the first air outlet 1213 is not communicated with the air outlet channel 117 and the air transmission channel 413 is communicated with both the first mixing cavity 211 and the second mixing cavity 212, the mixed air sequentially flows from the second premixing cavity 1221 to the first mixing cavity 211 and the second mixing cavity 212 through the air outlet channel 117, the internal channel of the fan 3 and the air transmission channel 413, respectively, that is, the first fire hole 213 and the second fire hole 214 can both perform gas ignition combustion.

(3) A third operation mode: when the first air outlet 1213 is communicated with the air outlet channel 117 and the air delivery channel 413 is communicated with both the first mixing cavity 211 and the second mixing cavity 212, the mixed air in the first premixing cavity 1211 and the second premixing cavity 1221 is mixed in the air outlet channel 117, and flows to the first mixing cavity 211 and the second mixing cavity 212 respectively after passing through the inner channel of the fan 3 and the air delivery channel 413 in sequence, that is, the first fire hole 213 and the second fire hole 214 can both perform gas ignition combustion.

That is, combustor 2 and premixer 1's structure setting in this embodiment, make the structure setting of combustor 2 match premixer 1 state under different modes more, make when premixer 1 is in the single channel and switches on, can be only the second fire hole 214 of second hybrid chamber 212 department can ignite the burning, also can be first fire hole 213 and the equal ignition burning of second fire hole 214, when premixer 1 is in the double channel and switches on, first fire hole 213 and the equal ignition burning of second fire hole 214, make the quantity that can ignite the burning under different modes of fire hole and feed quantity of mist match more, improve burner's thermal efficiency, reduce harmful gas emission, and can effectively improve combustion stability, avoid because premixer 1 is few and the flame-out or the unstable problem of burning that the fire hole quantity leads to in to the gas mixture volume of combustor 2 output, improve burner's reliability of use.

As shown in fig. 13 and 14, the burner 2 includes a main cylinder 21 and a partition located inside the main cylinder 21 and dividing an inner cavity of the main cylinder 21 into a second mixing chamber 212 and a first mixing chamber 211 partitioned vertically, and a first fire hole 213 and a second fire hole 214 are opened on a side wall of the main cylinder 21. The partition has a communication passage 231 extending along the axis of the main cylinder 21, the lower end of the communication passage 231 communicates with the first mixing chamber 211, and the on-off control unit 5 enables the upper end of the communication passage 231 to selectively communicate with the gas delivery passage 413. The structure of the burner 2 is simple and is easy to be matched with the gas transmission component 4; and the structure of the burner 2 is arranged, so that the air inlet of the second mixing cavity 212 is positioned outside the air inlet of the first mixing cavity 211, and the convenience of the on-off control unit 5 for blocking the communication between the air transmission channel 413 and the first mixing cavity 211 can be improved.

In one embodiment, the partition includes a partition 22 and a communication pipe 23 connected, the partition 22 is connected to an inner wall of the main cylinder 21, the communication pipe 23 is vertically connected to an upper side of the partition 22 and has a communication passage 231 penetrating the partition 22, the second mixing chamber 212 is located between an outer wall of the communication pipe 23 and the inner wall of the main cylinder 21, and the first mixing chamber 211 is located below the partition 22.

The first fire holes 213 are preferably provided with a plurality of circles at even intervals in the axial direction of the main cylinder 21, and each circle of the first fire holes 213 includes a plurality of first fire holes 213 provided at even intervals in the circumferential direction of the main cylinder 21. The second fire holes 214 are preferably provided with a plurality of circles at even intervals in the axial direction of the main cylinder 21, and each circle of the first fire holes 214 includes a plurality of first fire holes 214 provided at even intervals in the circumferential direction of the main cylinder 21. The number of turns of the first fire holes 213 is preferably greater than that of the second fire holes 214.

Partition plate 22 includes a main plate portion perpendicular to main cylinder 21, in which a vent hole 221 communicating with first premix chamber 1211 is opened, and communication pipe 23 is vertically connected to the main plate portion, and vent hole 221 is located inside communication pipe 23. Preferably, the peripheral edge of the vent 221 extends upward to form an inner flange, and the inner flange is attached to the inner wall of the communication pipe 23, so as to better realize the installation and positioning of the partition plate 22 and the communication pipe 23. Further, the outer periphery of the main plate extends upward or downward to form an outer flange, and the outer flange is attached to the inner wall of the main cylinder 21, so as to better ensure the air tightness between the first mixing chamber 211 and the second mixing chamber 212.

In one embodiment, the burner 2 further includes an air inlet end plate 25, the air inlet end plate 25 is connected to the upper opening of the main cylinder 21, and the upper end of the communication pipe 23 is connected to the air inlet end plate 25. A first mixed air inlet 2511 communicated with the communicating pipe 23 is formed in the air inlet end plate 25, and a second mixed air inlet 2512 communicated with the second mixing cavity 212 is formed in the air inlet end plate 25. The on-off control unit 5 can connect or disconnect the first mixture intake port 2511 with the gas delivery passage 413, and the second mixture intake port 2512 with the gas delivery passage 413. Preferably, the second mixing intake ports 2512 are provided in plurality at intervals in the circumferential direction of the main cylinder 21 to improve the intake uniformity of the second mixing chamber 212.

The inlet end plate 25 extends radially outwardly of the main cylinder 21 to facilitate connection to the gas delivery assembly 4. Preferably, the air inlet plate portion 251 and the connecting plate portion 253 are included, the air inlet plate portion 251 is located inside the main cylinder 21, a first mixed air inlet 2511 and a second mixed air inlet 2512 are formed in the air inlet plate portion 251, and the connecting plate portion 253 extends outwards in the radial direction of the air inlet plate portion 251 and extends out of the radial outer side of the main cylinder 21 so as to facilitate connection of the combustor 2 and the air delivery assembly 4.

Connecting plate portion 253 is preferably higher than intake plate portion 251, i.e., connecting ring portion 252 is connected between the inner peripheral edge of connecting plate portion 253 and the outer peripheral edge of intake plate portion 251. The inner wall of the main cylinder 21 preferably abuts against the outer surface of the connecting ring portion 252, and the upper end surface of the main cylinder 21 preferably abuts against the lower surface of the connecting plate portion 253, so that the connection and positioning between the intake end plate 25 and the main cylinder 21 can be achieved more effectively. The intake end plate 25 is preferably welded to the main cylinder 21 to secure the structural stability of the burner 2.

In an embodiment, a distribution pipe 24 is disposed in the first mixing chamber 211, an upper end of the distribution pipe 24 is communicated with the communication channel 231, a lower end of the distribution pipe 24 is connected with a bottom of the first mixing chamber 211, a plurality of circles of distribution holes 241 are axially formed in a peripheral wall of the distribution pipe 24, and each circle of distribution holes 241 includes a plurality of distribution holes 241 spaced along a circumferential direction of the distribution pipe 24. The setting of distribution pipe 24 for in the gas mixture that leaves from communicating pipe 23 got into distribution pipe 24 earlier, by distribution pipe 24 flow direction first mixing chamber 211 again, the homogeneity of the inside gas mixture of first mixing chamber 211 can be improved to the distribution hole 241 that evenly sets up on the distribution pipe 24, thereby improves combustor 2 combustion uniformity.

As shown in fig. 10, the air delivery assembly 4 preferably includes a main air delivery member 41 and an adapter joint 42, the adapter joint 42 is connected between an air inlet end of the main air delivery member 41 and an air outlet of the blower 3, and an air inlet direction of the adapter joint 41 is perpendicular to an air outlet direction, so as to change an air flow direction, facilitate a structural layout of the combustion device, and improve a structural compactness. The adapter 42 is preferably detachably connected to the main gas transfer part 41.

As shown in fig. 11, 12, 14 and 15, the main gas transmission member 41 includes a gas transmission housing 411, the gas transmission housing 411 has the gas transmission passage 413 therein, an air inlet seat 412 is disposed inside the gas transmission housing 411, the air inlet seat 412 has a first gas transmission outlet 4122 and a gas transmission cavity 4121 communicating the first gas transmission outlet 4122 with the gas transmission passage 413, and a second gas transmission outlet 4113 is opened on the bottom of the gas transmission housing 411. The burner 2 is connected below the gas delivery housing 411, and the first gas delivery outlet 4122 can communicate with the first mixing chamber 211, and the second gas delivery outlet 4113 communicates with the second mixing chamber 212. The on-off control unit 5 is mounted on the gas transmission shell 411, and the on-off control unit 5 at least partially extends into the gas transmission cavity 4121 and can block the first gas transmission outlet 4122.

This kind of main gas transmission part 41's structural setting for switch module 5 realizes blocking first hybrid chamber 211 and gas transmission channel 413's intercommunication through blocking first gas transmission export 4122 and gas transmission channel 413's intercommunication, and the operation is convenient, does benefit to and carries out structural setting, and is favorable to realizing the installation of on-off control unit 5 on main gas transmission part 41.

Intake seat 412 is preferably located directly above first mixture inlet 2511 to better enable communication of first output port 4122 with first mixture inlet 2511.

In an embodiment, the gas transmission housing 411 includes a gas transmission pipe portion 4111 and a gas transmission tray portion 4112, an inlet end of the gas transmission pipe portion 4111 is connected to an outlet end of the adapter 43, an outlet end of the gas transmission pipe portion 411 is connected to an upper end of the gas transmission tray portion 4112, and the gas transmission pipe portion 4111 is provided with a gas transmission channel 413 along an extending direction thereof. An air cavity 414 is formed by penetrating an air outlet end of the air delivery pipe portion 4111 along a vertical direction, the air cavity 414 penetrates the air delivery disk portion 4112 and is communicated with the air delivery passage 411, and a second air outlet 4112 is formed by a lower opening of the air cavity 414. The air inlet seat 412 is disposed in the air cavity 414, and has an upper end connected to the top wall of the gas pipe portion 4112, and a lower end provided with the first gas outlet 4122. The upper end of the burner 2 is connected to the lower end surface of the gas transmission plate portion 4112. This kind of structure setting of main gas transmission spare 41 can improve the butt joint convenience with adapter joint 43, and makes things convenient for the setting of air inlet seat 412 and the setting of second output gas mouth 4113, still is favorable to realizing being connected with combustor 2.

Preferably, second gas output outlet 4113 comprises a main second gas output port in the shape of a ring to better fit the opening shape of second mixing chamber 212, improving uniformity into second mixing chamber 212. A connection rib portion is further connected between the lower end of the air inlet seat 412 and the sidewall of the air cavity 414, so as to enhance the connection stability and reliability of the air inlet seat 412 and the air delivery shell 411. The second gas output port 4113 further includes a plurality of strip-shaped auxiliary second gas output ports disposed on the connecting rib portion to improve the uniformity of gas input into the second mixing chamber 212.

An annular seal 44 is preferably disposed between the inlet seat 412 and the inlet end plate 25, and the first and

second mixture inlets

2511 and 2512 are located on the inner and outer sides of the seal 44.

The intake end plate 25 of the combustor 2 is connected to the lower end surface of the gas transmission housing 41, and specifically, the connecting plate portion 253 is connected to the lower surface of the gas transmission disk portion 4112. An annular seal 44 is preferably disposed between the gas transfer disk portion 4112 and the web portion 253.

In an embodiment, the gas transmission assembly 4 further includes a sealing cover 42, the sealing cover 42 is provided with a mounting hole for mounting the burner 2, the sealing cover 4 is detachably connected to the lower surface of the gas transmission disc portion 4112, the connecting plate portion 253 is clamped between the sealing cover 4 and the gas transmission disc portion 4112, and the main cylinder 21 is inserted into the mounting hole to improve the mounting stability of the burner 2.

In an embodiment, the on-off control unit 5 is a gas delivery solenoid valve, a valve body of the gas delivery solenoid valve is mounted on the gas delivery casing 411, and a tail end of a valve rod of the gas delivery solenoid valve extends into the gas delivery cavity 4121 and can block the first gas delivery outlet 4122. The on-off control unit 5 is provided as an electromagnetic valve, so that control convenience and control reliability can be improved.

The utility model also provides a gas hot water system, including foretell burner. The gas hot water equipment that this embodiment provided realizes the gas burning through adopting above-mentioned burner, can improve gas hot water equipment load control range for gas hot water equipment can satisfy miniwatt user demand and high-power user demand better, reduces gas hot water equipment's cost simultaneously.

In the detailed description of the above embodiments, various technical features may be arbitrarily combined, and for the sake of brevity, all possible combinations of the above technical features are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The details of the foregoing embodiments are merely representative of several embodiments of the present invention, which are described in more detail and detail, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A premixer, comprising:

a housing (11), the housing (11) having an air outlet channel (117) and a first and a second separate premix chamber (1211, 1221) inside, the first premix chamber (1211) having a first gas inlet (1214), a first air inlet (1212) and a first air outlet (1213), the second premix chamber (1221) having a second gas inlet (1224), a second air inlet (1222) and a second air outlet (1223), the first air outlet (1213) and the second air outlet (1223) each being communicable with the air outlet channel (117), the first premix chamber (1211) having a different minimum cross-sectional area than the second premix chamber (1221);

an outlet blocking unit (15) having a blocking state blocking the first air outlet (1213) from communicating with the air outlet channel (117) and an opening state communicating the first air outlet (1213) with the air outlet channel (117), the outlet blocking unit (15) being controllably switched between the opening state and the blocking state;

an inlet blocking unit (14), wherein the inlet blocking unit (14) blocks the first gas inlet (1214) when the outlet blocking unit (15) is in the blocking state, and the inlet blocking unit (14) can open the first gas inlet (1214) when the outlet blocking unit (15) is in the open state.

2. The premixer of claim 1, wherein a minimum cross-sectional area of the first premix chamber (1211) is greater than a minimum cross-sectional area of the second premix chamber (1221);

and/or the first premixing cavity (1211) is a first venturi tube structure with two large ends and a small middle part, the two ends of the first premixing cavity (1211) form the first air inlet (1212) and the first air outlet (1213), respectively, and the first gas inlet (1214) is opened at the necking part of the first venturi tube structure;

and/or the second premixing cavity (1221) is a second venturi tube structure with two large ends and a small middle part, the two ends of the second premixing cavity (1221) respectively form the second air inlet (1222) and the second air outlet (1223), and the second fuel gas inlet (1224) opens at the constriction of the second venturi tube structure.

3. The premixer according to claim 1, further comprising a premixing tube (12), wherein the premixing tube (12) is hermetically inserted in the casing (11), and an outer side wall of the premixing tube (12) and an inner side wall of the casing (11) surround to form a gas inlet chamber (118);

the first premixing cavity (1211) and the second premixing cavity (1221) are formed in the premixing pipe (12), the air outlet channel (117) is formed in the shell (11), and the first fuel gas inlet (1214) and the second fuel gas inlet (1224) are both communicated with the fuel gas inlet cavity (118).

4. The premixer of claim 3, further comprising an air outlet seat (13), wherein the air outlet seat (13) is connected to the first air outlet (1213) in a sealing manner, and a communication port (1312) communicating with the first air outlet (1213) is opened on the air outlet seat (13), and the outlet blocking unit (15) is capable of blocking the communication port (1312) to be in the blocked state or opening the communication port (1312) to be in the open state.

5. The premixer according to claim 4, wherein the outlet seat (13) has an outlet groove (1311) opening toward the first outlet port (1213), the communication port (1312) opens at a groove side wall of the outlet groove (1311), the outlet groove (1311) has a guide groove wall (1313), the guide groove wall (1313) is inclined in a direction toward the communication port (1312) to a direction away from the first outlet port (1213);

and/or the air outlet direction of the first air outlet (1213) is vertical to the air outlet direction of the communication port (1312);

and/or the first premixing cavity (1211) and the second premixing cavity (1221) both extend in a first direction, the first premixing cavity (1211) and the second premixing cavity (1221) are arranged side by side and in a spaced manner along a second direction, the air outlet direction of the communication port (1312) is arranged along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the outlet blocking unit (15) can act along the third direction to block or open the communication port (1312).

6. The premixer according to claim 1, wherein the outlet blocking unit (15) comprises an outlet solenoid valve, a valve body of the outlet solenoid valve is hermetically mounted on the housing (11), and a valve rod end of the outlet solenoid valve can extend into the air outlet channel (117) and can block the communication between the first air outlet (1213) and the air outlet channel (117).

7. The premixer according to claim 3, wherein the air inlet end of the premix tube (12) is exposed out of the casing (11), a limiting groove (116) is formed on the end surface of the air inlet end of the casing (11), a limiting plate (128) extends radially from the outer wall of the premix tube (12), and the limiting plate (128) is inserted into the limiting groove (116);

and/or a limit screw (19) is screwed on the outer wall of the air inlet end of the shell (11), the limit screw (19) extends along the axial direction of the shell (11), a sealing ring platform (126) is convexly arranged on the outer peripheral wall of the air inlet end of the premixing pipe (12), the sealing ring platform (126) is in sealing connection with the inner wall of the shell (11), and the screw head of the limit screw (19) is pressed against the outer end face of the sealing ring platform (126).

8. The premixer according to claim 7, wherein two of the restriction plates (128) are arranged at intervals along the circumference of the premixer tube (12), and the included angle between the two restriction plates (128) is not equal to 180 °;

and/or the limiting plates (128) are arranged in at least two positions along the circumferential direction of the premix pipe (12), and the shapes and/or the sizes of the at least two limiting plates (128) are different.

9. A combustion apparatus, comprising a burner (2) and a fan (3), wherein the burner (2) is provided with a plurality of fire holes, characterized in that it further comprises a premixer according to any one of claims 1-8, the outlet end of the outlet channel (117) is communicated with the inlet of the fan (3), and the outlet of the fan (3) is communicated with the fire holes.

10. The combustion device as claimed in claim 9, characterized in that the burner (2) has a first mixing chamber (211) and a second mixing chamber (212) separated therein, and the fire holes comprise a plurality of first fire holes (213) communicating with the first mixing chamber (211) and a plurality of second fire holes (214) communicating with the second mixing chamber (212);

the combustion device further comprises a gas transmission assembly (4) and an on-off control unit (5), the gas transmission assembly (4) is connected between the air outlet of the fan (3) and the combustor (2), the gas transmission assembly (4) is provided with a gas transmission channel (413) communicated with the air outlet, the gas transmission channel (413) is communicated with the second mixing cavity (212), and the on-off control unit (5) is provided with a conduction state enabling the first mixing cavity (211) to be communicated with the gas transmission channel (413) and a blocking state blocking the first mixing cavity (211) from being communicated with the gas transmission channel (413).

11. The combustion device as claimed in claim 10, wherein the burner (2) comprises a main cylinder (21) and a partition, the partition is located inside the main cylinder (21) and divides an inner cavity of the main cylinder (21) into the second mixing chamber (212) and the first mixing chamber (211) which are vertically partitioned, and the first fire hole (213) and the second fire hole (214) are opened on a side wall of the main cylinder (21);

the partition is provided with a communication channel (231) extending along the axis of the main cylinder body (21), the lower end of the communication channel (231) is communicated with the first mixing cavity (211), and the on-off control unit (5) can enable the upper end of the communication channel (231) to be selectively communicated with the gas transmission channel (413).

12. The combustion apparatus according to claim 11, wherein the partition includes a partition plate (22) and a communication pipe (23) connected, the partition plate (22) being connected with an inner wall of the main cylinder (21), the communication pipe (23) being connected vertically above the partition plate (22) and having the communication passage (231) penetrating the partition plate (22), the second mixing chamber (212) being located between an outer wall of the communication pipe (23) and the inner wall of the main cylinder (21), the first mixing chamber (211) being located below the partition plate (22);

and/or the combustor (2) further comprises an air inlet end plate (25) mounted at the upper end of the main cylinder body (21), the air inlet end plate (25) is provided with a first mixed gas inlet (2511) communicated with the communication channel (231) and a second mixed gas inlet (2512) communicated with the second mixing cavity (212), and the air inlet end plate (25) extends out of the main cylinder body (21) in the radial direction;

and/or, be provided with distributing pipe (24) in first hybrid chamber (211), the upper end and intercommunication passageway (231) of distributing pipe (24) communicate, the lower extreme of distributing pipe (24) with the chamber bottom of first hybrid chamber (211) is connected, along the axial seted up many rings of distribution hole (241) on the perisporium of distributing pipe (24), every circle of distribution hole (241) include along a plurality of distribution holes (241) of the circumference interval setting of distributing pipe (24).

13. The combustion apparatus as claimed in claim 10, wherein the gas delivery assembly (4) comprises a gas delivery casing (411), the gas delivery casing (411) has the gas delivery passage (413) therein, an air inlet seat (412) is disposed inside the gas delivery casing (411), the air inlet seat (412) has a first gas delivery outlet (4122) and a gas delivery cavity (4121) communicating the first gas delivery outlet (4122) with the gas delivery passage (413), and a second gas delivery outlet (4113) is opened on an outer side wall of the gas delivery casing (411);

the burner (2) is connected below the gas delivery shell (411), the first gas delivery outlet (4122) can be in sealed communication with the first mixing cavity (211), and the second gas delivery outlet (4113) is in sealed communication with the second mixing cavity (212);

the on-off control unit (5) is installed on the gas transmission shell (411), and at least part of the on-off control unit (5) extends into the gas transmission cavity (4121) and can seal the first gas transmission outlet (4122).

14. A gas-fired water heating apparatus comprising a combustion device according to any one of claims 9 to 13.