CN116951404A - Premixing device, combustion device and gas water heating equipment - Google Patents

Abstract

The invention belongs to the technical field of gas heating, and particularly discloses a premixer, a combustion device and gas hot water equipment. The premixer includes: the gas-liquid mixing device comprises a shell, a gas inlet and a gas outlet, wherein the shell is internally provided with a gas outlet channel, a first premixing cavity and a second premixing cavity which are separated, and the first premixing cavity is provided with a first gas inlet and a first gas outlet; the outlet blocking unit is provided with a blocking state for blocking the communication between the first air outlet and the air outlet channel and an opening state for enabling the first air outlet to be communicated with the air outlet channel; the inlet blocking and sealing unit is used for blocking the first gas inlet when the outlet blocking and sealing unit is in a blocking state, and can be used for opening the first gas inlet when the outlet blocking and sealing unit is in an opening state. The premixer, the combustion device and the gas water heating equipment disclosed by the invention can enlarge the power adjusting range of the combustion device and the gas water heating equipment, and can meet the high-power use requirement and the low-power use requirement, and improve the use flexibility and the use experience.

Description

Premixing device, combustion device and gas water heating equipment

Technical Field

The invention relates to the technical field of gas heating, in particular to a premixer, a combustion device and gas hot water supply equipment.

Background

Gas water heating devices such as gas water heaters, gas wall-mounted furnaces and the like all adopt combustion devices to burn 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 that air and gas are fully mixed in advance according to a certain proportion to form premixed air, and the premixed air is ignited and combusted in a combustor.

With the gradual increase of the heat supply quality requirements of the gas water heating equipment, the gas water heating equipment is required to have finer power control, so that the hot gas water heating equipment is required to have a larger broadband power adjustment to meet the requirements of users on different powers. The premixer is an important component for adjusting the stability of the equivalent ratio of the fuel gas to the air and influencing the load adjusting ratio in the full-premixing gas water heating equipment, and the structure and the performance of the premixer directly influence the load adjusting range of the gas water heating equipment.

The larger the load adjusting range of the gas water heater, the better the user experience on heat supply, but the smaller the adjusting range of the common premixer. In the prior art, in order to ensure that the premixer can better use efficiency in different power machine types, the premixer with different mixing calibers can be set for matching use. However, since the mixing aperture of the premixer is fixed, the load regulation ratio under different power operation is also fixed, so that when a high-power model is used, although the high-power output requirement can be obtained, the lower power output requirement cannot be obtained; when a low-power machine type is used, although the low-power requirement can be obtained, the high-power output requirement cannot be obtained, so that the ultra-wideband load adjustment which simultaneously meets the high-power output requirement and the low-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 heating apparatus.

Disclosure of Invention

One of the technical problems to be solved by the invention is to provide a premixer, so as to solve the problem that the existing premixer is difficult to simultaneously meet high-power use requirements and low-power use requirements, increase the load adjusting range of the premixer, and reduce the use cost of the premixer.

The second technical problem to be solved by the invention is to provide a combustion device, so as to solve the problems that the existing combustion device is difficult to meet the high-power use requirement and the low-power use requirement, increase the load adjusting range of the combustion device and reduce the use cost of the combustion device.

The invention solves the third technical problem of providing the gas water heating equipment so as to solve the problem that the existing gas water heating equipment is difficult to meet the high-power use requirement and the low-power use requirement simultaneously, increase the power adjusting range of the gas water heating equipment and reduce the cost of the gas water heating equipment.

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

a premixer, comprising:

the gas-liquid mixing device comprises a shell, wherein a gas outlet channel, a first premixing cavity and a second premixing cavity are formed in the shell, the first premixing cavity is provided with a first gas inlet, a first air inlet and a first gas outlet, the second premixing cavity is provided with a second gas inlet, a second air inlet and a second gas outlet, the first gas outlet and the second gas outlet can be communicated with the gas outlet channel, and the minimum cross section area of the first premixing cavity and the minimum cross section area of the second premixing cavity are different;

The outlet blocking unit is provided with a blocking state for blocking the communication between the first air outlet and the air outlet channel and an opening state for enabling the communication between the first air outlet and the air outlet channel, and the outlet blocking unit is controllably switched between the opening state and the blocking state;

the inlet blocking unit is used for blocking the first gas inlet when the outlet blocking unit is in the blocking state, and is used for opening the first gas inlet when the outlet blocking unit is in the opening state.

Compared with the background technology, the premixer has the following beneficial effects: 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, and compared with a premixer with only one premixing cavity, the premixer has a larger load adjusting range, so that high-power combustion and low-power combustion can be more favorably considered, and the use experience of the premixer is improved; meanwhile, the use requirements in two modes can be met by adopting one premixer, and compared with the mode of adopting a plurality of premixers to adjust the power, the power control device has lower cost and stronger universality; and when the premixer is in a single-channel conduction mode, the first gas inlet and the first gas outlet are plugged, so that air and/or gas can be effectively prevented from entering the first premixing cavity, the air pressure and the gas injection pressure of the fan are effectively ensured to only act on the second premixing cavity, the premixing effect of air and gas in the second premixing cavity is ensured during the single-channel conduction mode, the problem that the air and/or gas enters the first premixing cavity to cause overlarge gas pressure in the first premixing cavity is also avoided, and the use safety and 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 of a first venturi tube structure with large two ends and small middle, 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 formed at the necking position of the first venturi tube structure;

and/or the second premixing cavity is of a second venturi tube structure with large two ends and small middle, the two ends of the second premixing cavity respectively form the second air inlet and the second air outlet, and the second gas inlet is formed at the necking position of the second venturi tube structure.

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

the premixing tube is internally provided with a first premixing cavity and a second premixing cavity, the housing is internally provided with an air outlet channel, and the first gas inlet and the second gas inlet are both communicated with the 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, a communication port communicated with the first air outlet is formed in the air outlet seat, 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 is provided with an air outlet groove with an opening facing the first air outlet, the communication opening is arranged at a groove side wall of the air outlet groove, the air outlet groove is provided with a guide groove wall, and the guide groove wall is inclined in a direction away from the first air outlet along a direction facing the communication opening;

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

and/or, the first premixing cavity and the second premixing cavity extend in the first direction, the first premixing cavity and the second premixing cavity are arranged side by side and are separated along the second direction, the air outlet direction of the communication port is arranged along the third direction, the first direction, the second direction and the third direction are mutually perpendicular, and the outlet blocking unit can act along the third direction to block or open the communication port.

In one embodiment, the outlet blocking unit comprises an outlet electromagnetic valve, a valve body of the outlet electromagnetic valve is mounted on the shell in a sealing mode, and the tail end of a valve rod of the outlet electromagnetic valve can extend into the air outlet channel and block communication between the first air outlet and the air outlet channel.

In one embodiment, the air inlet end of the premixing 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 radially from the outer wall of the premixing tube, and the limiting plate is inserted into the limiting groove;

and/or, the outer wall of the air inlet end of the shell is screwed with a limit screw, the limit screw extends along the axial direction of the shell, the outer peripheral wall of the air inlet end of the premixing tube is convexly provided with a sealing ring table, the sealing ring table is in sealing connection with the inner wall of the shell, and the screw head of the limit screw is propped against the outer end face of the sealing ring table.

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

and/or the limiting plates are arranged at least two along the circumferential direction of the premixing tube, and the shapes and/or the sizes of the at least two limiting plates are different.

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

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

Compared with the background technology, the combustion device has the beneficial effects that: by adopting the premixer, the premixing of the fuel gas and the air can be realized, the load adjusting range of the combustion device can be improved, the combustion device can better meet the low-power use requirement and the high-power use requirement, and meanwhile, the cost of the combustion device is reduced.

In one embodiment, the burner has a first mixing chamber and a second mixing chamber separated therein, the fire holes including a plurality of first fire holes communicating with the first mixing chamber and a plurality of second fire holes communicating with the second mixing chamber;

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 burner, 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 conducting state enabling the first mixing cavity to be communicated with the gas transmission channel and a blocking state blocking the first mixing cavity from being communicated with the gas transmission channel.

In one embodiment, the burner comprises a main cylinder and a partition piece, wherein the partition piece is positioned in the main cylinder and divides the inner cavity of the main cylinder into the second mixing cavity and the first mixing cavity which are vertically separated, and the first fire hole and the second fire hole are formed in the side wall of the main cylinder;

the partition member is provided with a communication channel extending along the axis of the main cylinder body, 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 communicating pipe, the partition plate is connected with the inner wall of the main cylinder, the communicating pipe is vertically connected above the partition plate and provided with the communicating channel penetrating through the partition plate, the second mixing cavity is positioned between the outer wall of the communicating pipe and the inner wall of the main cylinder, and the first mixing cavity 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, wherein the air inlet end plate is provided with a first mixed gas inlet communicated with the communication 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 in the radial direction;

And/or, be provided with the distribution pipe in the first chamber that mixes, the upper end and the intercommunication passageway intercommunication of distribution pipe, the lower extreme of distribution pipe with the chamber end of first chamber that mixes is connected, the multiturn distribution hole has been seted up along the axial on the perisporium of distribution pipe, every circle distribution hole includes along a plurality of distribution holes that set up in the circumference interval of distribution pipe.

In one embodiment, the gas delivery assembly comprises a gas delivery shell, the gas delivery shell is internally provided with the gas delivery channel, the gas delivery shell is internally provided with a gas inlet seat, the gas inlet seat is provided with a first gas delivery outlet and a gas delivery cavity communicated with the first gas delivery outlet and the gas delivery channel, and the outer side wall of the gas delivery shell is provided with a second gas delivery outlet;

the burner is connected to the lower part of 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 arranged on the gas transmission shell, and at least part of the on-off control unit extends into the gas transmission cavity and can seal the first gas transmission outlet.

Compared with the background technology, the gas water heating equipment has the following beneficial effects: through adopting above-mentioned burner to realize gas combustion, can improve gas water heating equipment load adjustment scope for gas water heating equipment can satisfy miniwatt user demand and high-power user demand better, reduces gas water heating 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 airflow diagram of a premixer in a dual-channel conduction mode according to a first embodiment of the present invention;

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

FIG. 4 is a schematic diagram illustrating a split structure of a premixer according to a first embodiment of the present invention;

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

FIG. 6 is a cross-sectional view of a premixer provided in accordance with a first embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating an assembled structure of a premix tube and an outlet block according to a first embodiment of the present invention;

FIG. 8 is a schematic diagram of an outlet seat according to an embodiment of the present invention;

FIG. 9 is a schematic view of a combustion apparatus according to a second embodiment of the present invention;

FIG. 10 is a partial cross-sectional view of a combustion apparatus provided in accordance with a second embodiment of the present invention;

FIG. 11 is a schematic view of a combustion apparatus according to a second embodiment of the present invention in a first operation mode;

FIG. 12 is a schematic view of a combustion apparatus according to a second embodiment of the present invention in a second mode of operation;

FIG. 13 is a schematic view of a burner according to a second embodiment of the present invention;

FIG. 14 is a schematic view showing a part of the structure of a combustion apparatus according to a second embodiment of the present invention;

fig. 15 is a schematic structural diagram of a main air delivery member according to a second embodiment of the present invention.

Description of the reference numerals:

1. a premixer; 11. a housing; 111. a case main body; 112. a gas inlet joint; 1121. a gas inlet passage; 113. a valve seat portion; 114. a stud portion; 115. a flange plate portion; 116. a limit groove; 117. an air outlet channel; 118. a gas inlet cavity; 12. a premix tube; 121. a first premix tube portion; 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 portion; 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 air inlet pipe section; 125. an air outlet pipe part; 126. a seal ring table; 127. a nozzle holder; 128. a limiting plate; 129. sealing grooves; 1210. a connecting column part; 13. an air outlet seat; 131. a base; 1311. an air outlet groove; 1312. a communication port; 1313. guide groove wall; 132. a sealing plate part; 133. a convex ring portion; 14. an inlet blocking unit; 141. a baffle; 1411. a blocking part; 1412. a rotating shaft portion; 1413. a main board section; 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 passage; 24. a dispensing tube; 241. a dispensing orifice; 25. an intake end plate; 251. an air intake plate portion; 2511. a first mixed gas inlet; 2512. a second mixed gas inlet; 252. a connecting ring portion; 253. a connection plate portion;

3. a blower;

4. a gas delivery assembly; 41. a main gas delivery member; 411. a gas transmission shell; 4111. a gas pipe section; 4112. a gas transmission disc part; 4113. a second gas outlet; 412. an air inlet seat; 4121. an air delivery chamber; 4122. a first gas outlet; 413. a gas transmission channel; 414. an air cavity; 42. sealing cover; 43. an adapter; 44. a seal;

5. and an on-off control unit.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "vertical," "horizontal," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

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

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 1, the present embodiment provides a premixer 1 which is applicable to a combustion apparatus of a gas water heating apparatus for achieving premixing of air and gas, thereby supplying a mixed gas having a certain air-fuel ratio to a burner in the combustion apparatus to achieve combustion. The premixer provided by the invention is a full-premixing type premixer, and in the premixer 1, air and fuel gas are sufficiently premixed, so that the propagation speed of combustion flame in a combustor of a combustion device is high, the volume and the heat intensity of a combustion chamber are very high, and complete combustion can be achieved under a small excess air coefficient.

Specifically, as shown in fig. 1 to 5, the premixer 1 includes a housing 11, an inlet baffle unit 14, and an outlet baffle unit 15. Wherein, the shell 11 is provided with a first premixing cavity 1211 and a second premixing cavity 1221 which are separated, the first premixing cavity 1211 is provided with a first gas inlet 1214, a first air inlet 1212 and a first air outlet 1213, the second premixing cavity 1221 is provided with 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 premixing cavity 1211 is different from the minimum cross-sectional area of the second premixing cavity 1221; the outlet blocking unit 15 has a blocking state blocking the communication of the first air outlet 1213 with the air outlet channel 117 and an open state allowing the communication of the first air outlet 1213 with the air outlet channel 117, the outlet blocking unit 15 being controllably switched between the open 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.

The premixer 1 provided in this embodiment can make the premixer 1 have two mixing modes 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 outlet 1213: 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, i.e. only the second premixing chamber 1221 plays a role in mixing air, and the premixer 1 is in a single-channel conduction mode; when both the first air outlet 1213 and the first gas inlet 1214 are opened, both the first air outlet 1213 and the second air outlet 1223 are in communication with the air outlet channel 117, i.e., both the first premix chamber 1211 and the second premix chamber 1221 function to mix air with gas, when the premix 1 is in the dual channel conduction mode.

In practical application, when the adjustment ratio of the fan is certain, for example, the adjustment ratio is calculated according to 1:5, that is, the ratio of the minimum rotation speed wind speed adjustment value and the maximum wind speed adjustment value of the fan is 1:5, because the fully premixed load is in direct proportion to the cross section area of the air inlet, when the premixer 1 is provided with two premixing cavities, and the minimum cross section areas of the premixing cavities are the same, the maximum load value of each premixing cavity is 10kW, the minimum load value of each premixing cavity is the same, 10/5=2 kW, that is, the total maximum load value of the two premixing cavities is 20kW, the total minimum load value of the two premixing cavities is the minimum load value of a single mixing cavity, that is 2kW, and at the moment, the load adjustment ratio of the premixer 1 is 20/2, that is 10/1. When the minimum cross-sectional areas of the two premixing cavities are different, the maximum load value of each premixing cavity is different, and the total maximum load value of the two premixing cavities is 30kW, the minimum load value is 10/5=2 kW, and the load regulation ratio of the premixer 1 is 30/2, namely 15/1, assuming that the maximum load values are respectively 10kW and 20 kW.

That is, in the present embodiment, it is assumed that the adjustment ratio of the blower is 1: k, the maximum load value of the first premix chamber 1211 is P1, and the minimum load value is P1/K; the second premix chamber 1221 has a maximum load value of P2 and a minimum load value of P2/K. When the premixer 1 is in the 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: P1/(P1/K) =k; when the pre-mixer 1 is in the dual-channel conduction mode, the total maximum load value of the pre-mixer 1 is p1+p2, the total minimum load value is (p1+p2)/K, and the load adjustment ratio of the pre-mixer 1 is a= (p1+p2)/(P1/K) =k+p2k/P1.

That is, in this embodiment, by providing the first premix chamber 1211 and the second premix chamber 1221 with different minimum cross-sectional areas, and selectively blocking the first air outlet 1213 by the outlet blocking unit 15, the premixer 1 may have a single-channel conduction mode and a dual-channel conduction mode, so that the load adjustment range of the premixer 1 is larger compared with that of the premixer 1 having only one premix chamber, thereby being more beneficial to both high-power combustion and low-power combustion, and improving the use experience of the premixer 1; meanwhile, the use requirements in two modes can be met by adopting one premixer 1, and compared with the mode of adopting a plurality of premixers 1 to adjust the power, the power control device has lower cost and stronger universality; and when the premixer 1 is in the single-channel conduction mode, the first gas inlet 1214 and the first gas outlet 1213 are plugged, so that air and/or gas can be effectively prevented from entering the first premixing cavity 1211, the air pressure and the gas injection pressure of the fan are effectively ensured to only act on the second premixing cavity 1221, the premixing effect of air and gas in the second premixing cavity 1221 in the single-channel conduction mode is ensured, the problem that the air and/or gas enters the first premixing cavity 1211 to cause overlarge gas pressure in the first premixing cavity 1211 is also avoided, and the use safety and reliability of the premixer 1 are improved.

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 chambers has a positive correlation with the maximum load value, if P1 > P2, the load adjustment ratio a=k+p2k/P1 > 2K can be increased to the greatest extent, thereby increasing the load adjustment range, reducing the minimum power that the premix 1 can output, and further meeting the low power usage requirements of the premix 1 and the combustion device.

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

By arranging the first premix chamber 1211 and the second premix chamber 1221 in a venturi structure, the gas flow can accelerate when passing through the necking position of the venturi structure, and meanwhile, as the gas inlets (the first gas inlet 1214 and the second gas inlet 1224) are arranged at the necking position of the venturi structure, the accelerated flow of the gas flow at the necking position can generate negative pressure at the gas inlets, so that the gas is better promoted to be injected into the corresponding first premix chamber 1211 or the second premix chamber 1221 through the gas inlets, and the mixing uniformity of the gas and the air is enhanced.

It will be appreciated that the minimum cross-sectional area of the first premix chamber 1211 and the minimum cross-sectional area of the second premix chamber 1221 may each be configured according to the actual load turndown ratio requirements of the gas water heater apparatus, as the invention is not limited in this regard.

As shown in fig. 4 to 6, in order to improve the convenience of processing of the premixer 1, the premixer 1 further includes a premixer tube 12 positioned inside the housing 11, the premixer tube 12 is inserted into the housing 11 in a sealed manner, a first premixer chamber 1211 and a second premixer chamber 1221 are formed in the premixer tube 12, and an air outlet passage 117 is formed inside the housing 11 outside the premixer tube 12. By providing the housing 11 and the premix tube 12, the premix tube 12 and the housing 11 can be processed independently, the processing convenience of the premix tube 12 is improved, and the versatility of the housing 11 is improved by providing different premix tubes 12 to obtain premixers 1 with different load adjustment ratios on the basis of keeping the housing 11 unchanged.

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

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

The first premix tube portion 121 and the second premix tube portion 122 each include an inlet pipe section, a necking section and an outlet pipe section sequentially connected along a first direction, cross sectional areas of the inlet pipe section and the outlet pipe section in a direction perpendicular to the first direction are gradually reduced along a direction towards the necking section, cross sectional areas of the necking sections are equal everywhere and are the same as minimum cross sectional areas of the inlet pipe section and the outlet pipe section, a first gas inlet 1214 is formed in the necking section of the first premix tube portion 121, and a second gas inlet 1224 is formed in the necking section of the second premix tube portion 122.

Preferably, the first gas inlet 1214 has a larger venting area than the second gas inlet 1224 so that the first premix chamber 1211, having a relatively larger minimum cross-sectional area, is able to vent more gas than the second premix chamber 1221 to better meet the air and gas mixing requirements.

The shell 11 comprises a cylindrical shell main body 111 with two open ends, the premixing tube 12 is inserted into the shell main body 111 in a sealing way, a gas inlet cavity 118 is formed between the outer wall of the premixing tube 12 and the inner wall of the shell main body 111 in a surrounding way, and the first gas inlet 1214 and the second gas inlet 1224 are communicated with the gas inlet cavity 118. A gas inlet joint 112 is provided on the outer peripheral wall of the case main body 111, and a gas inlet passage 1121 communicating with the gas inlet chamber 118 is provided in the gas inlet joint 112. By providing the gas inlet cavity 118 and the gas inlet joint 112, an external gas supply device can be connected with the gas inlet joint 112, so that gas supply to the premixer 1 is realized; and the gas provided by the external gas supply device enters the gas inlet cavity 118 through the gas inlet channel 1121 and is distributed into the first premix cavity 1211 and/or the second premix cavity 1221 through the gas inlet cavity 118, so that the gas inlet convenience of the first premix cavity 1211 and the second premix cavity 1221 is improved.

The outer peripheral walls of the necking sections of the first premix tube portion 121 and the second premix tube portion 122 are respectively provided with a nozzle seat 127 in a radial extending mode, a mounting cavity communicated with a corresponding first gas inlet 1214 or a corresponding second gas inlet 1224 is arranged in the nozzle seat 127, a nozzle is arranged in the mounting cavity, an air inlet of the nozzle is communicated with the gas inlet cavity 118, and an air jet of the nozzle is communicated with the corresponding first gas inlet 1214 or the corresponding second gas inlet 1224. By providing the nozzle, the speed at which the fuel gas is injected from the fuel gas intake chamber 118 to the first premix chamber 1211 or the second premix chamber 1221 can be increased, which is advantageous in improving the mixing effect of the fuel gas and 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 orifice diameter of the first nozzle 16 is larger than the orifice diameter of the second nozzle 17.

In order to improve the connection convenience between the premix tube 12 and the housing 11, the premix tube 12 further includes a cylindrical air inlet pipe portion 124, and the first end of the first premix tube portion 121 and the first end of the second premix tube 12 are 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 fed into the first premix chamber 1211 and the second premix chamber 1221, that is, the first premix chamber 1211 and the second premix chamber 1221 are fed with air through the same air inlet pipe portion 124. The air intake pipe portion 124 is hermetically connected to the inner wall of the housing 11. The premix tube 12 further includes a cylindrical outlet tube portion 125, and the second end of the first premix tube portion 121 and the second end of the second premix tube portion 122 are both connected to the outlet tube portion 125, and the outlet tube portion 125 is hermetically connected to the housing 11.

By providing the air outlet pipe portion 125 and the air inlet pipe portion 124, the convenience of connection between the premix tube 12 and the housing 11 can be improved, the seal between the housing 11 and the premix tube 12 can be facilitated, and the connection between other structures and the premix tube 12 can be facilitated.

In an embodiment, annular sealing ring platforms 126 are protruding on the outer peripheral walls of the air inlet pipe portion 124 and the air outlet pipe portion 125, annular sealing grooves 129 are formed in the sealing ring platforms 126, sealing rings 18 are arranged in the sealing grooves 129, the sealing ring platforms 126 are attached to the inner wall surface of the shell 11, and the inner wall of the shell 11 presses the sealing rings 18 to achieve sealing between the air inlet pipe portion 124 and the shell 11 and sealing between the air outlet pipe portion 125 and the shell 11. The gas inlet cavity 118 is located between the two seal rings 18 to avoid leakage of gas in the gas inlet cavity 118.

The premixer 1 is preferably provided with a first limiting structure for limiting the depth of insertion of the premix tube 12 into the housing 11, so as to better realize the installation positioning and limiting of the premixer 1 and the housing 11, and improve the installation accuracy and the installation convenience. In an embodiment, as shown in fig. 1 to 6, the outer wall of the air inlet pipe portion 124 extends outwards to form a limiting plate 128, 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. The first limiting structure is arranged, so that the air inlet pipe part 124 is partially exposed out of the shell 11, and the disassembly of the air inlet pipe part 124 is facilitated.

The limiting plates 128 are preferably provided at least two intervals along the circumferential direction of the intake pipe portion 124 to improve the limiting reliability. 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 limiting plates 128 is not equal to 180 °, and/or at least two limiting plates 128 are different in shape and/or size. The limiting plate 128 and the limiting groove 116 form a foolproof structure, so that the pre-mixing pipe 12 is prevented from being assembled in a staggered manner relative to the shell 11 in the circumferential direction, and the assembly precision and the assembly convenience of the pre-mixing pipe 12 and the shell 11 are improved.

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

The setting of this kind of second limit structure, the dismouting is convenient to can conveniently be through lifting down stop screw 19, realize premixing pipe 12 from the inside taking out of casing 11, improve premixing pipe 12 and casing 11's installation and dismantlement convenience. Meanwhile, the relative positions of the premixing tube 12 and the shell 11 are limited by the first limiting structure and the second limiting structure, the need of directly locking the shell 11 and the premixing tube 12 through threads can be avoided, and the processing difficulty and the processing precision requirement on the premixing tube 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 action of gravity or elastic force, and when the inlet blocking unit 14 is in the opening state, the inlet blocking unit 14 can open the first gas inlet 1214 under the action of the air inlet pressure of the first premix chamber 1211. This arrangement eliminates the need to power the inlet blocking unit 14, reduces costs, and improves the automaticity of opening or closing the first gas inlet 1214.

As shown in fig. 2-5, in one embodiment, the first premix chamber 1211 is positioned below the second premix chamber 1221 and the first gas inlet 1224 is positioned on a side of the first premix chamber 1211 that is remote from the second premix chamber 1221. The inlet blocking unit 14 includes a blocking plate 141, a first end of the blocking plate 141 has 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 blocking the first gas inlet 1214 and a second position opening the first gas inlet 1214. The inlet blocking unit 14 is arranged so that the baffle 141 can block the first gas inlet 1214 under the action of gravity.

In one embodiment, the flap 141 extends obliquely from the first end to the second end in a direction proximate to the second air inlet 1222 when the blocking portion 1411 is in the first position. The arrangement is such that the baffle 141 is inclined relative to the air inlet direction of the first premix chamber 1211, when the first air outlet 1213 is opened, an air flow passage is allowed in the first premix chamber 1211, air pressure of air flowing in from the first air inlet 1222 acts on the baffle 141, a rotation moment is applied to the baffle 141, and the second end of the baffle 141 is promoted to rotate in a direction away from the first gas inlet 1214, so that the baffle 141 rotates from the first position to the second position, and the air pressure required by the baffle 141 rotating to the second position is reduced. When the first premix chamber 1211 stops entering air, the baffle 141 returns to the first position under the action of gravity, so as to seal the first gas inlet 1214 by the seal portion 1411. In another embodiment, the baffle 141 may also be perpendicular to the air intake direction of the first premix chamber 121.

The baffle 141 preferably further includes a rotating shaft portion 1412 and a main plate portion 1413, the main plate portion 1413 is connected between the rotating shaft portion 1412 and the blocking portion 1411, the rotating shaft portion 1413 is rotatably connected with the premix tube 12, and the rotating shaft portion 1413 is horizontally disposed and located between the first air inlet 1212 and the second air inlet 1222. With this arrangement, the convenience of mounting the barrier 141 can be improved, and the air feed of the second premix chamber 1221 and the first premix chamber 1211 by the arrangement of the barrier 141 can be reduced, thereby reducing interference. In other embodiments, the rotating shaft 1412 may also be located entirely within the first premix chamber 121.

In an 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 123 and parallel to the partition 123, and the rotating shaft 1412 is rotatably sleeved on the rotating shaft 142, which facilitates the rotation and installation of the baffle 141. The main plate portion 1413 is preferably a plate-like structure disposed at an angle to the partition plate portion 123 to increase the area of the air flow pressure acting on the barrier 141, thereby improving the reliability of the opening of the barrier 141 from the first position to the second position.

In order to better promote the baffle 141 to be in the first position under the action of gravity, the thickness of the plugging 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 realized, and the whole gravity center of the baffle 141 moves towards the position where the plugging portion is located, thereby being more beneficial to promoting the first end of the baffle 141 to fall back to the position where the first fuel gas inlet 1214 is plugged under the action of gravity.

In an embodiment, the inlet blocking unit 14 further includes an elastic member for maintaining or returning the damper 141 to the first position, thereby improving the reliability of the inlet blocking unit 14 blocking the first gas inlet 1214. In another embodiment, the damper 141 may be placed in the first position or restored to the first position from the second position by only the elastic force of the elastic member, without considering the influence of gravity on the rotation of the damper 141.

The baffle 141 is preferably made of an elastic material, such as a rubber material or a silica gel material, so as to facilitate the sealing between the sealing portion 1411 and the end face where the first gas inlet 1214 is located. Preferably, the inner wall of the neck portion 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 portion 1411 can be attached to the blocking plane to improve the blocking effect of the blocking portion 1411 on the first gas inlet 1214.

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

As shown in fig. 6-8, in an embodiment, the premixer 1 further includes an air outlet seat 13, where the air outlet seat 13 is connected to the first air outlet 1213 in a sealing manner, and the air outlet seat 13 is provided with a communication port 1312 that communicates with the first air outlet 1213, and the outlet blocking unit 15 can block the communication port 1312 to place the outlet blocking unit 15 in a blocking state, or open the communication port 1312 to place the outlet blocking unit 15 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 of unchanged size of the premix tube 12, thereby reducing the design requirement on the outlet blocking unit 15, improving the blocking and conducting convenience of the outlet blocking unit 15 on the first air outlet 1213 and the air outlet channel 117, and being beneficial to realizing the overall structure layout in the premix tube 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 structural compactness. Further, preferably, the axis of the communication port 1312 is disposed along a third direction, and the outlet blocking unit 15 can act 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 at the same time, the interference of the outlet blocking unit 15 with the air outlet of the second premixing chamber 1221 can be avoided.

In one embodiment, the air outlet seat 13 has an air outlet slot 1311 opening toward the first air outlet 1213, the communication port 1312 is opened at a slot sidewall of the air outlet slot 1311, the air outlet slot 1311 has a guiding slot wall 1313, and the guiding slot wall 1313 is inclined in a direction away from the first air outlet 1213 toward the communication port 1312. This arrangement thus enables the guide groove wall 1313 to provide guidance for the flow of the air flow from the first air outlet 1213 to the communication port 1312, improving the smoothness of the flow of the air flow, and reducing the flow resistance of the air flow. The air outlet seat 13 has an outer side surface parallel to the guide side wall so as to be small in size of the air outlet seat 13.

The air outlet seat 13 further comprises a stop side plate parallel to the partition plate portion 123, the stop side plate is connected with one side of the guide groove wall 1313, and the stop side plate is coplanar with the partition plate portion 123, and the main structure of the air outlet seat 13 is located on one side of the stop side plate away from the second air outlet 1223, so that the influence of the arrangement of the air outlet seat 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 flowing from the second premixing cavity 1221 to the air outlet channel 117 can be reduced.

In an embodiment, the air outlet seat 13 includes a seat body 131 and a sealing plate portion 132, the seat body 131 is provided with the air outlet groove 1311 and the communication port 1312, and the sealing plate portion 132 extends outwards along the opening end face of the seat body 131 to seal a portion of the first air outlet 1213 located outside the seat body 131, and facilitates connection of the air outlet seat 13 with the premix tube 12.

In this embodiment, the air outlet seat 13 is connected to the premix tube 12 by a connection screw to improve connection stability. Illustratively, a connecting post portion 1210 is protruding on the pipe wall of the premix pipe 12 along the first direction, a connecting threaded hole is formed in the connecting post portion 1210, a connecting through hole is formed in the sealing plate portion 132, the connecting through holes are in one-to-one correspondence with the connecting threaded holes, and the air outlet seat 13 is connected with the premix pipe 12 through 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 base 131 to improve connection stability and reliability.

In this embodiment, a connecting post portion 1210 is protruding on the inner wall of the first premix tube portion 121 and the inner wall of the second premix tube portion 122, and the projection of the connecting post portion 1210 on the plane perpendicular to the first direction is located in the projection range of the corresponding necking segment on the plane, so as to reduce the influence of the arrangement of the connecting post portion 1210 on the airflow.

In one 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 a third direction, and a first end of the valve rod of the outlet solenoid valve extends into the outlet channel 117, and a valve plate is disposed at a distal 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 the outlet solenoid valve can refer to the structure of the existing solenoid valve, which is not the focus of the present invention and will not be described herein.

To improve the sealing performance of the outlet solenoid valve to the communication port 1312, the air outlet seat 13 further includes a convex ring portion 133 disposed 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 elastic material such as rubber or silica gel, so as to realize sealing performance of the communication port 1312 by pressing and deforming the convex ring portion 133 by the valve plate.

To better realize the installation of the outlet solenoid valve, as shown in fig. 2 to 4, the outer surface of the case main body 111 is convexly provided with a valve seat portion 113, the valve seat portion 113 is penetratingly provided with a valve installation opening communicating with the outlet channel 117, the valve body is sealingly installed on the valve seat portion 113, and the valve stem extends into the communication opening 1312 through the valve installation opening.

In order to better realize the connection between the premixer 1 and the fan, the air outlet end of the shell main body 111 extends radially outwards to form a flange plate portion 115, and fixing holes are formed in the flange plate portion 115 and used for penetrating fasteners, and the fixing holes are preferably arranged at intervals along the circumferential direction of the flange plate portion 115.

Example two

As shown in fig. 9 and 10, the embodiment of the present invention provides a combustion apparatus which can be applied to a gas water heating device for realizing supply and ignition combustion of a mixed gas of gas and air having a certain air-fuel ratio.

The combustion device provided by the embodiment comprises a combustor 2, a premixer 1, a fan 3 and a gas transmission assembly 4. The premixing device comprises a premixing device 1, a burner 2, a fan 3 and a fan, wherein the premixing device 1 is used for premixing air and fuel gas so as to convey mixed gas to the burner 2, and an air outlet channel of the premixing device 1 is communicated with the air inlet of the fan 3; the burner 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 burner 2 so as to input and distribute mixed gas to the burner 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 portion 115 of the premixer 1 is attached to and detachably connected to one end surface of the scroll casing.

In one embodiment, the combustor 2 has first and second spaced apart mixing chambers 211 and 212 therein, and the fire holes include first fire holes 213 communicating with the first mixing chamber 211 and second fire holes 214 communicating with the second mixing chamber 212. The gas delivery assembly 4 has a gas delivery passage 413 in communication with the outlet, the gas delivery passage 413 being in communication with the second mixing chamber 212. The combustion apparatus further includes an on-off control unit 5, the on-off control unit 5 having a conducting state in which the first mixing chamber 211 communicates with the gas delivery passage 413 and a blocking state in which the first mixing chamber 211 is blocked from communicating with the gas delivery passage 413.

As shown in fig. 11 and 12, the combustion device provided in this embodiment can realize three operation modes by the structural arrangement of the burner 2 and the premixer 1:

(1) First mode of operation: 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 gas flows from the second premixing cavity 1221 to the second mixing cavity 212 sequentially through the air outlet channel 117, the internal channel of the fan 3 and the air delivery channel 413, and is ignited and combusted by communicating with the second mixing cavity 212 and the second fire hole 214. In this mode of operation, since the second premix chamber 1221 may allow for less loaded operating conditions and the burner 2 has mixed gas flowing out only at the second flame holes 214, the number of flame holes in use of the burner 2 can be adapted to the content of mixed gas passing through the second premix chamber 1221, better low-power combustion of the combustion device can be achieved, better combustion stability and better combustion thermal efficiency can be maintained.

(2) Second mode of operation: when the first air outlet 1213 is not communicated with the air outlet channel 117 and the air delivery channel 413 is communicated with the first mixing cavity 211 and the second mixing cavity 212, the mixed gas 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 delivery channel 413, that is, the first fire hole 213 and the second fire hole 214 can perform gas ignition combustion.

(3) Third mode of operation: when the first air outlet 1213 is communicated with the air outlet channel 117 and the air delivery channel 413 is communicated with the first mixing cavity 211 and the second mixing cavity 212, the mixed gas 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 after sequentially passing through the internal channel of the fan 3 and the air delivery channel 413, that is, the first fire hole 213 and the second fire hole 214 can perform gas ignition combustion.

That is, in this embodiment, the structural arrangement of the burner 2 and the premixer 1 is more matched with the state of the premixer 1 in different modes, so that when the premixer 1 is in single-channel conduction, only the second fire holes 214 at the second mixing cavity 212 can be ignited and combusted, or the first fire holes 213 and the second fire holes 214 can be ignited and combusted, and when the premixer 1 is in double-channel conduction, the first fire holes 213 and the second fire holes 214 can be ignited and combusted, so that the number of fire holes capable of igniting and combusting in different modes is more matched with the feeding amount of mixed gas, the thermal efficiency of the combustion device is improved, the emission amount of harmful gas is reduced, the combustion stability is effectively improved, the problem of unstable combustion or unstable combustion caused by the large number of fire holes due to the small amount of mixed gas output from the premixer 1 to the burner 2 is avoided, and the reliability of the combustion device is improved.

As shown in fig. 13 and 14, the burner 2 includes a main cylinder 21 and a partition member which is disposed inside the main cylinder 21 and divides an inner cavity of the main cylinder 21 into a second mixing chamber 212 and a first mixing chamber 211 which are vertically partitioned, 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 the burner is easy to be matched with the gas transmission assembly 4; and the structure of the burner 2 is arranged so that the air inlet of the second mixing cavity 212 is positioned at the outer side of the air inlet of the first mixing cavity 211, thereby improving the convenience of the on-off control unit 5 for blocking the communication between the air conveying channel 413 and the first mixing cavity 211.

In an embodiment, the partition includes a partition plate 22 and a communication pipe 23 connected, the partition plate 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 plate 22 and has a communication passage 231 penetrating the partition plate 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 plate 22.

The first fire holes 213 are preferably provided with a plurality of circles at uniform 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 uniform intervals in the circumferential direction of the main cylinder 21. The second fire holes 214 are preferably provided with a plurality of circles at uniform 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 uniform intervals in the circumferential direction of the main cylinder 21. The number of turns of the first fire hole 213 is preferably greater than the number of turns of the second fire hole 214.

The partition plate 22 includes a main body plate portion perpendicular to the main cylinder 21, the main body plate portion is provided with a vent 221 communicating with the first premix chamber 1211, the communication pipe 23 is vertically connected to the main body plate portion, and the vent 221 is located inside the communication pipe 23. Preferably, the periphery of the vent 221 extends upward to form an inner flange portion, and the inner flange portion is attached to the inner wall of the communicating tube 23, so as to better realize the installation and positioning of the partition plate 22 and the communicating tube 23. Further, an outer flange portion extends upward or downward from the outer periphery of the main body plate portion, and the outer flange portion is attached to the inner wall of the main cylinder 21, so that the air tightness between the first mixing chamber 211 and the second mixing chamber 212 is better ensured.

In an embodiment, the burner 2 further includes an intake end plate 25, the intake end plate 25 is connected to the upper end opening of the main cylinder 21, and the upper end of the communication pipe 23 is connected to the intake end plate 25. The intake end plate 25 is provided with a first mixing intake 2511 communicating with the communication pipe 23, and the intake end plate 25 is provided with a second mixing intake 2512 communicating with the second mixing chamber 212. The on-off control unit 5 can make the first mixing inlet 2511 communicate with the gas delivery passage 413 or break off, and the second mixing inlet 2512 communicates with the gas delivery passage 413. Preferably, the second mixing air inlets 2512 are provided in plurality at intervals along the circumferential direction of the main cylinder 21 to improve the air intake uniformity of the second mixing chamber 212.

The inlet end plate 25 extends radially outwardly from the main cylinder 21 to facilitate connection with the gas delivery assembly 4. Preferably, the burner comprises an air inlet plate portion 251 and a connecting plate portion 253, wherein the air inlet plate portion 251 is positioned in the main cylinder 21 and provided with a first mixing air inlet 2511 and a second mixing air inlet 2512, and the connecting plate portion 253 extends outwards along 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 burner 2 with the air delivery assembly 4.

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

In an embodiment, a distributing pipe 24 is disposed in the first mixing chamber 211, an upper end of the distributing pipe 24 is communicated with the communicating channel 231, a lower end of the distributing pipe 24 is connected with a bottom of the first mixing chamber 211, a plurality of circles of distributing holes 241 are axially formed in a peripheral wall of the distributing pipe 24, and each circle of distributing holes 241 includes a plurality of distributing holes 241 arranged at intervals along a circumferential direction of the distributing pipe 24. The distribution pipe 24 is arranged, so that the mixed gas left from the communication pipe 23 flows into the distribution pipe 24 from the distribution pipe 24 to the first mixing cavity 211, and the distribution holes 241 uniformly arranged on the distribution pipe 24 can improve the uniformity of the mixed gas in the first mixing cavity 211, thereby improving the combustion uniformity of the burner 2.

As shown in fig. 10, the air delivery assembly 4 preferably includes a main air delivery member 41 and an adapter connector 42, wherein the adapter connector 42 is connected between an air inlet end of the main air delivery member 41 and an air outlet of the air blower 3, and an air inlet direction of the adapter connector 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 structural compactness. The adapter 42 is preferably detachably connected to the main gas transfer element 41.

As shown in fig. 11, 12, 14 and 15, the main gas delivery member 41 includes a gas delivery shell 411, the gas delivery shell 411 has the gas delivery channel 413, a gas inlet seat 412 is disposed in the gas delivery shell 411, the gas inlet seat 412 has a first gas delivery outlet 4122 and a gas delivery cavity 4121 communicating the first gas delivery outlet 4122 and the gas delivery channel 413, and a second gas delivery outlet 4113 is formed in the bottom of the gas delivery shell 411. The burner 2 is connected to the lower portion of the gas delivery casing 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 seal the first gas transmission outlet 4122.

The structure setting of this kind of main gas-supply piece 41 for switch module 5 realizes blocking the intercommunication of first hybrid chamber 211 and gas-supply passageway 413 through blocking the intercommunication of first gas outlet 4122 and gas-supply passageway 413, and convenient operation does benefit to the structure setting, and is favorable to realizing the installation of break-make control unit 5 on main gas-supply piece 41.

The intake seat 412 is preferably located directly above the first mixture inlet 2511 to better communicate the first outlet port 4122 with the first mixture inlet 2511.

In an embodiment, the gas delivery casing 411 includes a gas delivery pipe portion 4111 and a gas delivery disc portion 4112, an inlet end of the gas delivery pipe portion 4111 is connected to an outlet end of the adapter 43, an outlet end of the gas delivery pipe portion 411 is connected to an upper end of the gas delivery disc portion 4112, and the gas delivery pipe portion 4111 is provided with a gas delivery passage 413 along an extending direction thereof. The air outlet end of the air delivery pipe portion 4111 is vertically penetrated to form an air cavity 414, the air cavity 414 penetrates through the air delivery disc portion 4112 and is communicated with the air delivery channel 411, and a second air outlet 4112 is formed in the lower opening of the air cavity 414. The air inlet seat 412 is disposed in the air chamber 414, and has an upper end connected to a top wall of the air duct portion 4112, and a lower end provided with the first air outlet 4122. The upper end of the burner 2 is connected to the lower end surface of the gas delivery disc portion 4112. The structural arrangement of the main gas transmission member 41 can improve the convenience of butt joint with the adapter 43, is convenient for the arrangement of the gas inlet seat 412 and the second gas outlet 4113, and is also beneficial to realizing connection with the burner 2.

Preferably, the second gas outlet 4113 comprises an annular main second gas outlet to better adapt the shape of the opening of the second mixing chamber 212, improving the uniformity of the entry into the second mixing chamber 212. A connection rib part is further connected between the lower end of the air inlet seat 412 and the side wall 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 outlet 4113 further includes a plurality of strip-shaped auxiliary second gas outlets disposed on the connecting rib portion, so as to improve the air intake uniformity of the second mixing chamber 212.

An annular seal 44 is preferably provided between the intake seat 412 and the intake end plate 25, and the first and second mixture inlets 2511, 2512 are located on both the inner and outer sides of the seal 44.

The air intake end plate 25 of the burner 2 is connected to the lower end surface of the air delivery case 41, specifically, the connection plate portion 253 is connected to the lower surface of the air delivery tray portion 4112. An annular seal 44 is preferably provided between the gas disk portion 4112 and the connecting plate portion 253.

In an embodiment, the gas delivery assembly 4 further includes a sealing cover 42, a mounting hole for mounting the burner 2 is formed in the sealing cover 42, the sealing cover 4 is detachably connected to the lower surface of the gas delivery disc portion 4112, the connecting plate portion 253 is sandwiched between the sealing cover 4 and the gas delivery disc portion 4112, and the main cylinder 21 is penetrated in the mounting hole to improve the mounting stability of the burner 2.

In one embodiment, the on-off control unit 5 is a gas transmission electromagnetic valve, a valve body of the gas transmission electromagnetic valve is mounted on the gas transmission shell 411, and a valve rod end of the gas transmission electromagnetic valve extends into the gas transmission cavity 4121 and can seal the first gas transmission outlet 4122. The on-off control unit 5 is provided as an electromagnetic valve, and control convenience and control reliability can be improved.

The invention also provides gas water heating equipment which comprises the combustion device. The gas water heating equipment that this embodiment provided through adopting above-mentioned burner to realize gas combustion, can improve gas water heating equipment load adjustment scope for gas water heating equipment can satisfy miniwatt user demand and high-power user demand better, reduces gas water heating equipment's cost simultaneously.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing detailed description of the embodiments presents only a few embodiments of the present invention, which are described in some detail and are not intended to limit the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (14)

1. A premixer, comprising:

a housing (11), wherein an air outlet channel (117) and a first premixing cavity (1211) and a second premixing cavity (1221) are formed in the housing (11), the first premixing cavity (1211) is provided with a first fuel gas inlet (1214), a first air inlet (1212) and a first air outlet (1213), the second premixing cavity (1221) is provided with a second fuel 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) can be communicated with the air outlet channel (117), and the minimum cross section area of the first premixing cavity (1211) and the minimum cross section area of the second premixing cavity (1221) are different;

An outlet blocking unit (15) having a blocking state blocking communication of the first air outlet (1213) with the air outlet channel (117) and an open state allowing communication of the first air outlet (1213) with the air outlet channel (117), the outlet blocking unit (15) being controllably switched between the open state and the blocking state;

the inlet blocking unit (14) is used for blocking the first gas inlet (1214) when the outlet blocking unit (15) is in the blocking state, and the inlet blocking unit (14) is used for opening the first gas inlet (1214) when the outlet blocking unit (15) is in the opening state.

2. The premixer of claim 1, wherein 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/or, the first premixing cavity (1211) is a first venturi tube structure with large two ends and small middle, the two ends of the first premixing cavity (1211) respectively form the first air inlet (1212) and the first air outlet (1213), and the first gas inlet (1214) is arranged at the necking position of the first venturi tube structure;

And/or, the second premixing cavity (1221) is a second venturi structure with large two ends and small middle, 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 gas inlet (1224) is arranged at the necking position of the second venturi structure.

3. The premixer of claim 1, further comprising a premix tube (12), wherein the premix tube (12) is sealingly inserted into the housing (11), and a gas inlet chamber (118) is formed around the outer side wall of the premix tube (12) and the inner side wall of the housing (11);

the premixing tube (12) is internally provided with the first premixing cavity (1211) and the second premixing cavity (1221), the housing (11) is internally provided with the air outlet channel (117), 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. A premixer according to 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) communicated with the first air outlet (1213) is formed in the air outlet seat (13), and the outlet blocking unit (15) can block the communication port (1312) to be in the blocking state or open the communication port (1312) to be in the opening state.

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

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

and/or, the first premixing cavity (1211) and the second premixing cavity (1221) extend in a first direction, the first premixing cavity (1211) and the second premixing cavity (1221) are arranged side by side and separated 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 mutually perpendicular, and the outlet blocking unit (15) can act along the third direction to block or open the communication port (1312).

6. The premixer of any of claims 1-5, wherein the outlet baffle unit (15) comprises an outlet solenoid valve, the valve body of which is sealingly mounted on the housing (11), the valve stem end of which is able to extend into the outlet channel (117) and to block communication of the first outlet (1213) with the outlet channel (117).

7. The premixer of any one of claims 3-5, wherein the air inlet end of the premixing tube (12) is exposed out of the housing (11), a limiting groove (116) is formed in the end face of the air inlet end of the housing (11), a limiting plate (128) is radially extended from the outer wall of the premixing tube (12), and the limiting plate (128) is inserted into the limiting groove (116);

and/or, limit screw (19) is screwed on the outer wall of the air inlet end of casing (11), limit screw (19) are followed the axial extension of casing (11), the periphery wall of the air inlet end of premixing pipe (12) is protruding to be equipped with sealing ring platform (126), sealing ring platform (126) with casing (11) inner wall sealing connection, the spiral shell head of limit screw (19) support press in the outer terminal surface of sealing ring platform (126).

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

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

9. A combustion device comprising a burner (2) and a fan (3), wherein a plurality of fire holes are formed in the burner (2), the combustion device is characterized by further comprising a premixer according to any one of claims 1-8, an air outlet end of the air outlet channel (117) is communicated with an air inlet of the fan (3), and an air outlet of the fan (3) is communicated with the fire holes.

10. The combustion device according to claim 9, characterized in that the burner (2) has a first mixing chamber (211) and a second mixing chamber (212) separated inside, the fire holes comprising 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 conducting state for enabling the first mixing cavity (211) to be communicated with the gas transmission channel (413) and a blocking state for blocking the first mixing cavity (211) from being communicated with the gas transmission channel (413).

11. The combustion device according to claim 10, wherein the burner (2) comprises a main cylinder (21) and a partition member, the partition member is positioned inside the main cylinder (21) and divides an inner cavity of the main cylinder (21) into the second mixing cavity (212) and the first mixing cavity (211) which are vertically separated, and the first fire hole (213) and the second fire hole (214) are formed on the side wall of the main cylinder (21);

The partition member 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).

12. The combustion device according to claim 11, characterized in that the partition comprises a partition plate (22) and a communicating pipe (23) connected, the partition plate (22) being connected to the inner wall of the main cylinder (21), the communicating pipe (23) being connected vertically above the partition plate (22) and having the communicating passage (231) penetrating the partition plate (22), the second mixing chamber (212) being located between the outer wall of the communicating 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 (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 (21) along the radial direction;

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

13. The combustion apparatus according to claim 10, wherein the gas delivery assembly (4) comprises a gas delivery casing (411), the gas delivery casing (411) is provided with the gas delivery channel (413) therein, a gas inlet seat (412) is provided in the gas delivery casing (411), the gas inlet seat (412) is provided with a first gas delivery outlet (4122) and a gas delivery cavity (4121) communicating the first gas delivery outlet (4122) and the gas delivery channel (413), and a second gas delivery outlet (4113) is provided on an outer side wall of the gas delivery casing (411);

the burner (2) is connected below the gas transmission shell (411), the first gas transmission outlet (4122) can be communicated with the first mixing cavity (211) in a sealing way, and the second gas transmission outlet (4113) is communicated with the second mixing cavity (212) in a sealing way;

the on-off control unit (5) is mounted on the gas transmission shell (411), and the on-off control unit (5) at least partially stretches into the gas transmission cavity (4121) and can seal the first gas transmission outlet (4122).

14. A gas water heating apparatus comprising a combustion device as claimed in any one of claims 9 to 13.