CN115234914B - Gas distribution device, burner, water heater and water heater control method - Google Patents
Gas distribution device, burner, water heater and water heater control methodInfo
- Publication number
- CN115234914B CN115234914B CN202110434086.9A CN202110434086A CN115234914B CN 115234914 B CN115234914 B CN 115234914B CN 202110434086 A CN202110434086 A CN 202110434086A CN 115234914 B CN115234914 B CN 115234914B
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- China
- Prior art keywords
- gas
- valve shaft
- air
- gas distribution
- burner
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
- F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
- F23D14/66—Preheating the combustion air or gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
本发明公开一种气体分配装置、燃烧器、热水器及热水器的控制方法，其中，所述气体分配装置包括：壳体，所述壳体形成有气体分配室和分别连通所述气体分配室的进气口和出气口；阀轴，在第一位置和第二位置之间可转动地设于所述气体分配室，并将所述气体分配室分隔形成连通所述进气口的进气腔和连通所述出气口的出气腔，所述阀轴上设有过流孔；以及驱动机构，与所述阀轴驱动连接，用于驱动所述阀轴在所述第一位置和所述第二位置之间转动切换。本发明通过采用气体分配装置上的阀轴在第一位置和第二位置之间转动切换，实现根据需要调整燃烧器所需气体流量，进而实现准确的流量控制，减少燃烧器产生的有害气体。
This invention discloses a gas distribution device, a burner, a water heater, and a control method for the water heater. The gas distribution device includes: a housing having a gas distribution chamber and an inlet and an outlet respectively communicating with the gas distribution chamber; a valve shaft rotatably disposed in the gas distribution chamber between a first position and a second position, dividing the gas distribution chamber into an inlet chamber communicating with the inlet and an outlet chamber communicating with the outlet, the valve shaft having a flow passage hole; and a drive mechanism drivenly connected to the valve shaft, used to drive the valve shaft to rotate and switch between the first position and the second position. This invention, by using the valve shaft on the gas distribution device to rotate and switch between the first and second positions, achieves accurate flow control by adjusting the required gas flow rate of the burner as needed, thereby reducing harmful gases produced by the burner.
Description
Technical Field
The invention relates to the field of water heaters, in particular to a gas distribution device, a burner, a water heater and a control method of the water heater.
Background
When the gas water heater operates, gas enters the water heater through the gas valve and is injected into the burner through the nozzle for combustion. Because the input quantity of the fuel gas can be controlled only through the fuel gas valve, the fuel gas quantity finally input to the burner is inconsistent with the fuel gas load requirement required by the water heater, and the harmful gas generated by the water heater is increased.
Disclosure of Invention
The invention mainly aims to provide a gas distribution device, a burner, a water heater and a control method of the water heater, and aims to solve the problem that the gas flow of the existing burner is inconvenient to control.
In order to achieve the above object, the present invention provides a gas distribution apparatus for a burner, comprising:
The shell is provided with a gas distribution chamber, and a gas inlet and a gas outlet which are respectively communicated with the gas distribution chamber;
a valve shaft rotatably disposed in the gas distribution chamber between a first position and a second position and dividing the gas distribution chamber into an air inlet chamber communicating with the air inlet and an air outlet chamber communicating with the air outlet, the valve shaft being provided with an overflow hole, and
The driving mechanism is in driving connection with the valve shaft and is used for driving the valve shaft to rotate and switch between the first position and the second position, when the valve shaft is positioned at the first position, the overflow hole is staggered with the air inlet cavity and/or the air outlet cavity, and when the valve shaft rotates and switches from the first position to the second position, the overflow hole is communicated with the air inlet cavity and the air outlet cavity, and the effective through flow of the overflow hole is gradually increased.
Optionally, the air outlet is provided with a plurality of nozzles, and the plurality of nozzles are arranged at intervals.
Optionally, the nozzles are spaced apart along the axial direction of the valve shaft.
Optionally, the number of the overflow holes is multiple, the plurality of the overflow holes are arranged at intervals along the axial direction of the valve shaft, the plurality of the overflow holes are arranged in one-to-one correspondence with the plurality of the nozzles, or the overflow holes are strip holes arranged along the axial direction of the valve shaft.
Optionally, an overflow cavity is arranged in the valve shaft, the overflow hole comprises a first air flow hole and a second air flow hole which are respectively communicated with the overflow cavity, when the valve is switched to the second position in the axial direction, the first air flow hole is used for being communicated with the air inlet cavity, and the second air flow hole is used for being communicated with the air outlet cavity.
Optionally, the volume of the air outlet cavity is larger than the volume of the air inlet cavity.
Optionally, the gas distribution apparatus further comprises:
The positioning part is arranged in the gas distribution chamber, a containing cavity for containing the valve shaft, a third air flow hole for communicating the containing cavity with the air inlet cavity and a fourth air flow hole for communicating the containing cavity with the air outlet cavity are formed in the positioning part, and the valve shaft is rotatably arranged in the containing cavity;
When the valve shaft is positioned at the first position, the overflow hole and the third air flow hole and/or the fourth air flow hole are staggered, and when the valve shaft is rotated and switched from the first position to the second position, the overflow hole is communicated with the third air flow hole and the fourth air flow hole, and the effective through flow of the overflow hole is gradually increased.
Optionally, the air flow direction of the air outlet and the air flow direction of the air inlet form an included angle.
Optionally, a guiding surface is formed on the inner wall surface of the air outlet cavity, and the guiding surface is used for guiding the air to flow to the air outlet direction.
The invention also proposes a burner comprising:
A housing in which a first combustion chamber and a second combustion chamber are formed to communicate with each other;
The preheating burner is arranged on the shell and used for burning to form mixed gas so as to heat the air in the first combustion chamber to a preset temperature and convey the air to the second combustion chamber;
The gas distribution device is provided in the housing, and is configured to inject gas into the second combustion chamber so as to perform a high-temperature air combustion reaction in the second combustion chamber.
Optionally, the burner further comprises:
The pre-mixer is arranged on the shell and is used for introducing fuel gas and air for pre-mixing to form mixed gas and conveying the mixed gas to the preheating burner and the gas distribution device.
Optionally, the burner further comprises:
And the distributor is arranged on the shell, connected with the premixer and used for respectively conveying the mixed gas formed by the premixer to the preheating burner and the gas distribution device.
The invention also proposes a water heater comprising:
A body;
the burner is arranged on the machine body and
And the heat exchanger is arranged on the machine body, connected with the second combustion chamber and used for carrying out heat exchange with the flue gas generated by the high-temperature air combustion reaction of the burner.
Optionally, the water heater further comprises:
a temperature sensor for the temperature in the second combustion chamber, and
And the controller is electrically connected with the machine body and the temperature sensor and is used for acquiring the temperature in the second combustion chamber and the heat load required by the water heater, and the controller is also used for controlling the driving mechanism of the gas distribution device to drive the valve shaft to rotate and switch from the first position to the second position when the temperature in the second combustion chamber reaches the preset temperature so as to enable the gas distribution device to transmit gas to the second combustion chamber for high-temperature air combustion so as to reach the heat load range required by the water heater.
The invention also provides a control method of the water heater, which is used for the water heater and is characterized by comprising the following steps:
acquiring the temperature in the second combustion chamber and the heat load required by the water heater, and
When the temperature in the second combustion chamber reaches the preset temperature, the driving mechanism of the gas distribution device is controlled to drive the valve shaft to rotate and switch from the first position to the second position, so that the gas distribution device can deliver gas to the second combustion chamber to burn high-temperature air, and the required heat load range of the water heater is achieved.
According to the technical scheme, the valve shaft on the gas distribution device is adopted to rotate and switch between the first position and the second position, so that the gas flow entering the gas distribution chamber is changed, the gas flow required by the burner is adjusted according to the requirement, further accurate flow control is realized, the gas distribution efficiency is improved, and the problem of harmful gas generation caused by the fact that the gas flow is not matched with the gas quantity required by the burner is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an embodiment of a gas distribution apparatus according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 with the valve shaft in a first position;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1 with the valve shaft in a second position;
FIG. 4 is an exploded view of a gas distribution apparatus of the present invention;
FIG. 5 is a cross-sectional view taken along B-B of FIG. 1 with the valve shaft in a second position;
FIG. 6 is a schematic illustration of a valve shaft according to an embodiment of the present invention;
FIG. 7 is a schematic view of an embodiment of the housing of the present invention;
FIG. 8 is a cross-sectional view taken along the direction C-C in FIG. 7;
FIG. 9 is a cross-sectional view taken along the direction D-D in FIG. 7;
FIG. 10 is a schematic view of an embodiment of a water heater according to the present invention;
Fig. 11 is a left side view of fig. 10.
Reference numerals illustrate:
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Body of machine | 11 | Heat exchanger |
| 12 | Heat exchange tube | 13 | Fume collecting hood |
| 20 | Outer casing | 21 | Preheating burner |
| 22 | Premixing device | 23 | Air inlet |
| 24 | Gas inlet | 25 | Dispenser |
| 30 | Shell body | 31 | Gas distribution chamber |
| 311 | Air inlet cavity | 312 | Air outlet cavity |
| 32 | Nozzle | 33 | Positioning part |
| 331 | Accommodating cavity | 332 | Third air flow hole |
| 333 | Fourth air flow hole | 34 | Flow guiding surface |
| 35 | Valve shaft | 351 | Flow-through hole |
| 352 | First air flow hole | 353 | Second air flow hole |
| 354 | Overcurrent cavity | 355 | Positioning groove |
| 36 | Driving mechanism | 37 | Sealing ring |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present invention), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a 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 at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a gas distribution device, which is used for a burner and is used for introducing fuel gas or mixed gas of the fuel gas and air into the burner. The burner may be used in a water heater, a heating apparatus, or the like for heating a medium by gas combustion. For convenience of description, the apparatus will be described below as an example of a water heater. Fig. 1 to 11 are drawings corresponding to embodiments of the present invention.
Referring to fig. 1, 2 and 3, in one embodiment, the gas distribution apparatus includes a housing 30, wherein the housing 30 is formed with a gas distribution chamber 31 and a gas inlet and a gas outlet respectively communicating with the gas distribution chamber 31, the housing 30 is used for forming a casing of the gas distribution apparatus, and a hollow chamber is formed inside the housing 30, and is used for forming the gas distribution chamber 31. The gas inlet and the gas outlet are respectively communicated with the gas distribution chamber 31 for realizing gas input and output.
A valve shaft 35 rotatably disposed in the gas distribution chamber 31 between a first position and a second position, and dividing the gas distribution chamber 31 into an inlet chamber 311 communicating with the inlet and an outlet chamber 312 communicating with the outlet, wherein the valve shaft 35 is provided with an overflow hole 351. The valve shaft 35 has a rod-like structure and is rotatable relative to the housing 30. The flow-through holes 351 are disposed through the valve shaft 35 in a radial direction. The first position and the second position are two position states during the rotation of the valve shaft 35, and the directions of the flow-through holes 351 of the valve shaft 35 are different in the first position and the second position states. The valve shaft 35 is disposed inside the gas distribution chamber 31, so that two cavities, an inlet cavity 311 and an outlet cavity 312, are formed inside the gas distribution chamber 31. When the valve shaft 35 rotates at the first position and the second position, the direction of the flow through hole 351 changes, when the valve shaft 35 is at the second position, the flow through hole 351 forms an air flow channel which communicates the air inlet cavity 311 with the air outlet cavity 312, and when the valve shaft 35 is at the first position, at least one end of the flow through hole 351 is attached to the inner wall surface of the shell 30, so that the flow through hole 351 is closed, and no air flow can be carried out between the air inlet cavity 311 and the air outlet cavity 312.
The driving mechanism 36 is in driving connection with the valve shaft 35, and is used for driving the valve shaft 35 to rotate and switch between the first position and the second position, when the valve shaft 35 is located at the first position, the overflow hole 351 is staggered with the air inlet cavity 311 and/or the air outlet cavity 312, and when the valve shaft 35 rotates and switches from the first position to the second position, the overflow hole 351 is communicated with the air inlet cavity 311 and the air outlet cavity 312, and the effective passing flow of the overflow hole 351 is gradually increased. The drive mechanism 36 is configured to drive the valve shaft 35 to rotate within the housing 30. The drive mechanism 36 may be an existing drive member such as a motor.
Optionally, when the gas distribution device is manufactured, the gas distribution device is provided with a first surface facing the interior of the burner and a second surface facing away from the interior of the burner, the gas outlet of the gas distribution device is arranged on the first surface and facing the interior of the burner, and the driving mechanism is arranged on one side of the second surface, so that the driving mechanism is arranged far away from the combustion area of the burner. The gas distribution device can be used for isolating heat generated by a combustion area of the burner, so that the influence of high combustion temperature in the burner on the control of the driving mechanism is avoided. When the burner operates, gas flows in the gas distribution device, the continuous flow of the gas can bring heat on the surface of the gas distribution device to the combustion area of the burner, so that the effect of cooling the gas distribution chamber can be achieved, and particularly, the temperature of the second surface of the gas distribution device, which is opposite to the combustion area in the burner, can be relatively reduced, so that the heat insulation effect can be further achieved.
Referring to fig. 4 and 5, the flow-through hole 351 has a first air flow hole 352 for communicating with the air inlet chamber 311 and a second air flow hole 353 for communicating with the air outlet chamber 312. When the driving mechanism 36 drives the valve shaft 35 to be at the first position, at least one of the first airflow hole 352 and the second airflow hole 353 is blocked by the inner wall surface of the housing 30, the airflow passage between the air inlet chamber 311 and the air outlet chamber 312 is closed, and the airflow of the air inlet chamber 311 cannot enter the air outlet chamber 312.
When the valve shaft 35 rotates to the second position under the driving of the driving mechanism 36, the first airflow hole 352 is communicated with the air inlet cavity 311, the second airflow hole 353 is communicated with the air outlet cavity 312, the airflow passing hole 351 forms an airflow channel which is communicated with the air inlet cavity 311 and the air outlet cavity 312, and the airflow in the air inlet cavity 311 enters the air outlet cavity 312 through the airflow passing hole 351 and is output by the air outlet hole. The gas distribution chamber is at a maximum flow condition.
When the valve shaft 35 is positioned between the first position and the second position, at least one of the first air flow hole 352 and the second air flow hole 353 partially fits between the inner wall surface of the housing 30, so that the flow rate of the air flow through the flow hole 351 is partially blocked, and the flow rate of the air flow through the flow hole 351 is smaller than the flow rate of the air flow through the valve shaft 35 when it is positioned at the second position.
When the valve shaft 35 is rotated and switched from the first position to the second position, the airflow passage formed by the flow-through hole 351 is gradually opened, and the effective flow rate of the flow-through hole 351 is gradually increased. By adjusting the position of the valve shaft 35 by the driving mechanism 36, the instantaneous output gas amount of the gas distribution device can be realized, and the adjustment of the gas supply amount of the burner can be realized.
When the burner is used for the water heater, the relative position of the valve shaft 35 is adjusted through the driving mechanism 36 due to different heat loads required by the water heater under different working conditions, such as different room temperatures and different target temperatures, so that the air flow of the air distribution device is adjusted, the air supply is further realized according to the required air supply amount of the burner and the heat load of the water heater, the air supply amount is further matched with the current working condition and the required heat load, the problem that the existing constant-state air supply is insufficient in combustion of fuel gas is avoided, and nitrogen oxides and carbon monoxide generated by insufficient combustion are further avoided.
In this embodiment, the specific working condition information of the burner may be sent to the controller, and the gas supply required by the current working condition and the current required heat load range is calculated by the controller, and the controller controls the driving mechanism 36 to adjust the gas quantity input to the burner by the gas distribution device, so that the burner achieves the optimal combustion working condition.
A positioning groove 355 may be provided at a connection portion between the valve shaft 35 and the housing 30, and a seal ring 37 may be provided in the positioning groove 355 to seal the valve shaft 35.
Referring to fig. 7, 8 and 9, in order to control the rotation of the valve shaft 35 conveniently, in an embodiment, the gas distribution device further includes a positioning portion 33 disposed in the gas distribution chamber 31, a receiving cavity 331 for receiving the valve shaft 35, a third airflow hole 332 communicating the receiving cavity 331 with the air inlet cavity 311, and a fourth airflow hole 333 communicating the receiving cavity 331 with the air outlet cavity 312 are formed in the positioning portion 33, and the valve shaft 35 is rotatably disposed in the receiving cavity 331, and the positioning portion 33 is a protruding portion disposed on an inner wall surface of the housing 30 and is used for limiting the valve shaft 35. The shape of the inner wall surface of the accommodating chamber 331 is at least in conformity with the shape of a part of the outer wall surface of the valve shaft 35, so that the valve shaft 35 can relatively rotate between the first position and the second position in the accommodating chamber 331.
When the valve shaft 35 is in the first position, the overflow hole 351 and the third air flow hole 332 and/or the fourth air flow hole 333 are staggered, and when the valve shaft 35 is switched from the first position to the second position, the overflow hole 351 is communicated with the third air flow hole 332 and the fourth air flow hole 333, and the effective passing flow of the overflow hole 351 is gradually increased.
The third airflow hole 332 and the fourth airflow hole 333 are respectively used for communicating the air inlet cavity 311 and the air outlet cavity 312. When the valve shaft 35 is at the first position, at least one of the first air flow hole 352 and the second air flow hole 353 of the flow hole 351 of the valve shaft 35 is attached to the inner wall surface of the positioning portion 33, so that the air flow can enter the air outlet chamber 312 through the flow hole 351. When the valve shaft 35 is in the second position, the first airflow aperture 352 is aligned with the third airflow aperture 332, the second airflow aperture 353 is aligned with the fourth airflow aperture 333, and the valve shaft 35 communicates with the inlet chamber 311 and the outlet chamber 312.
When the valve shaft 35 is between the first position and the second position, the first airflow hole 352 is partially overlapped with the third airflow hole 332, the second airflow hole 353 is partially overlapped with the fourth airflow hole 333, and the rotation position of the valve shaft 35 can be adjusted by the driving mechanism 36, so that the air flow from the air inlet cavity 311 into the air outlet cavity 312 can be adjusted.
Through setting up location portion 33 with valve shaft 35 cooperatees, can realize to valve shaft 35 is spacing, makes casing 30 can better with valve shaft 35 cooperatees, realizes the accurate control of the rotation position of valve shaft 35, and then promotes the controllability of the gas flow of combustor.
Referring to fig. 4, optionally, the air outlet is provided with a plurality of nozzles 32, and the plurality of nozzles 32 are spaced apart from each other. The plurality of nozzles 32 are respectively communicated with the gas distribution chamber 31, and the gas distribution chamber 31 is used for dispersing the gas so that the gas can be outputted through the nozzles 32 in a dispersed manner. When gas is injected and combusted through the nozzle 32, the nozzle 32 can be used to isolate the gas distribution chamber 31 from the outside of the burner, preventing the gas flow in the gas distribution chamber 31 from overheating and causing backfire problems.
The nozzle 32 may change the direction of the output air flow of the air distribution chamber 31 according to the need, so that the flame during the combustion of the burner presents a preset angle, and can keep a preset distance from the housing 30, thereby avoiding the problem of backfire or flame separation caused by overhigh temperature of the air flow emitted from the housing 30 due to the high temperature during the combustion of the gas of the burner. When the mixed gas is input into the gas distribution chamber 31, the gas distribution chamber 31 can be used for providing a space for mixing the gas flows, so that the gas flows can be output in a fully mixed state, and the problem of insufficient combustion caused by uneven mixing of the gas in the gas flows is avoided.
The plurality of nozzles 32 may be arranged at intervals, the plurality of nozzles 32 may be arranged in the same direction, or the plurality of nozzles 32 may be arranged in different directions according to the internal space of the burner. Optionally, the nozzles 32 are spaced along the axial direction of the valve shaft 35, and the air flows into the air outlet cavity 312 through the flow holes 351 of the valve rod, and after the air outlet cavity 312 is mixed, the air is dispersed and output to each nozzle 32, so that each nozzle 32 can have a corresponding fuel gas supply. By arranging the nozzles 32 at intervals along the axial direction of the valve shaft 35, the air flow of the nozzles 32 can be determined according to the design of the internal combustion area of the burner, so that the control of the internal combustion space of the burner is realized, and the suitability of the air distribution device with a specific burner is improved.
In an embodiment, the housing 30 may have a long rod-shaped structure adapted to the valve rod, and when the valve rod is manufactured, the number of the flow through holes 351 may be plural, the plural flow through holes 351 are arranged at intervals along the axial direction of the valve shaft 35, and the plural flow through holes 351 are arranged in one-to-one correspondence with the plural nozzles 32, so that each nozzle 32 may have a corresponding air supply channel, and directional input of air flow is achieved. The axes of each of the flow-through holes 351 may be disposed parallel to each other such that the flow rate of the flow-through holes 351 is the same when the driving mechanism 36 drives the valve shaft 35 to rotate. The flow-through holes 351 may be provided in different directions according to the specific positions of the plurality of nozzles 32, and the amount of air flow obtained by each of the nozzles 32 may be different when the rotational position of the valve shaft 35 is adjusted. Taking the nozzle 32 as a first nozzle 32 with a first inner diameter and a second nozzle 32 with a second inner diameter as an example, the first nozzle 32 and the second nozzle 32 may be disposed at intervals, and when the valve shaft 35 rotates to an intermediate position between the first position and the second position, the air flow of the first nozzle 32 and the air flow of the second nozzle 32 are different, the inner diameters of the first nozzle 32 and the second nozzle 32 are different, and when the two output airflows burn, the effect of stabilizing flame mutually can be achieved.
In another embodiment, the flow-through holes 351 are elongated holes provided along the axial direction of the valve shaft 35, and the air flow rate delivered to each of the nozzles 32 is the same when the valve shaft 35 rotates.
When the gas distribution chamber 31 forms the gas inlet chamber 311 and the gas outlet chamber 312, the gas inlet chamber 311 is used for communicating with a gas source element, the gas outlet chamber 312 is used for mixing and homogenizing gas flow, and can also play a role in stabilizing the gas flow, optionally, the volume of the gas outlet chamber 312 is larger than that of the gas inlet chamber 311, so that the mixed gas of the gas and the air can be output after the gas outlet chamber 312 is fully mixed, and further, the uniformity of the gas flow is improved.
Optionally, the air flow direction of the air outlet and the air flow direction of the air inlet form an included angle, and by adjusting the direction of the air outlet, the space required by the burner can be saved, so that the air flow output by the air distribution device can be sprayed and combusted according to a preset angle. As shown in fig. 3, the air outlet is perpendicular to the air flow direction of the air inlet, and the air distribution device may be disposed at the side of the burner, so that the air outlet sprays air into the burner, and the internal space of the burner may be fully utilized. Further optionally, a guiding surface 34 is formed on an inner wall surface of the air outlet cavity 312, and the guiding surface 34 is used for guiding the air flow to the air outlet direction, so as to avoid vortex caused by severe turning of the air flow in the air outlet cavity 312, and help to reduce the flow resistance of the air flow.
Referring to fig. 5 and 6, in an embodiment, the valve shaft 35 is provided with an overflow cavity 354, the overflow hole 351 includes a first air flow hole 352 and a second air flow hole 353 that are respectively communicated with the overflow cavity 354, when the valve shaft 35 is switched to the second position, the first air flow hole 352 is used for communicating with the air inlet cavity 311, and the second air flow hole 353 is used for communicating with the air outlet cavity 312. The flow-through chamber 354 is a hollow chamber formed inside the valve shaft 35, and the first airflow hole 352 and the second airflow hole 353 are respectively communicated with the flow-through chamber 354. When the air flows from the first air flow hole 352 into the flow passing cavity 354, the air flows are mixed in the flow passing cavity 354, and are output to the air outlet cavity 312 through the second air flow hole 353.
When the first and second air flow holes 352 and 353 are provided at both sides of the valve shaft 35 in the radial direction, respectively, the first and second air flow holes 352 and 353 have the same air flow rate when the valve shaft 35 is rotated. The air flow enters the flow-through cavity 354, and is mixed in the flow-through cavity 354, and when the air flow is further input into the air outlet cavity 312, the uniformity of the air flow is improved, so that the combustion efficiency of the fuel gas is improved. When the housing 30 is provided with the positioning portion 33, the first airflow hole 352 corresponds to the third airflow hole 332 of the positioning portion 33, and the second airflow hole 353 corresponds to the fourth airflow hole 333 of the positioning portion 33, so as to facilitate controlling the airflow rate into the air outlet chamber 312.
The invention also proposes an embodiment of a burner.
Referring to fig. 10 and 11, the burner includes a housing 20, a first combustion chamber and a second combustion chamber which are communicated with each other are formed in the housing 20, a preheating burner 21 provided in the housing 20 for burning to form a mixed gas to heat air in the first combustion chamber to a predetermined temperature and to deliver the heated air to the second combustion chamber, and a gas distribution device provided in the housing 20 for injecting gas into the second combustion chamber to perform a high-temperature air combustion reaction in the second combustion chamber.
The preheating burner 21 is used for burning to form high-temperature mixed gas, the high-temperature mixed gas is mixed with air in the first combustion chamber, so that the air in the first combustion chamber is heated to a preset temperature and is conveyed to the second combustion chamber, when the fact that the gas conveyed into the second combustion chamber by the first combustion chamber reaches the preset temperature is detected, the gas distribution device sprays the gas into the second combustion chamber, and the gas combusts with high-temperature air in the second combustion chamber to form high-temperature flue gas.
And a high-temperature air combustion reaction is carried out in the second combustion chamber. In the high-temperature air combustion reaction, the chemical reaction needs to occur in a high-temperature low-oxygen environment, the temperature of a reactant is higher than the self-ignition temperature of the reactant, the maximum temperature rise in the combustion process is lower than the self-ignition temperature of the reactant, and the oxygen volume fraction is diluted to an extremely low concentration by combustion products. Compared with conventional combustion, in the combustion state, pyrolysis of the fuel is restrained, the flame thickness is thickened, the flame front disappears, the temperature of the whole second combustion chamber is very uniform, the combustion peak temperature is low, the noise is extremely low, and emission of pollutant nitrogen oxides and carbon monoxide is greatly reduced. However, a certain condition is required for achieving high-temperature air combustion, namely that the oxygen concentration of most areas in the furnace is required to be lower than a certain value, generally lower than 5% -10%, the fuel gas is ensured to be fully combusted and uniformly combusted, and the temperature is higher than the self-ignition point of the fuel, so that self-ignition is maintained. The preset temperature of the mixed flue gas reaches the spontaneous combustion temperature of the fuel gas sprayed by the gas distribution device, so that the fuel gas sprayed by the gas distribution device can maintain spontaneous combustion in the second combustion chamber.
Since the air in the first combustion chamber can supplement the combustion of the injected gas of the preheating burner 21, the oxygen concentration in the mixed smoke is relatively low, and the high-temperature air combustion reaction in the second combustion chamber is suitable. When the fuel gas sprayed by the gas distribution device is combusted at high temperature, the energy consumption required for combustion is reduced. A fan may be provided outside the burner to replenish air into the first combustion chamber, or other structures may be provided outside the burner to input air into the first combustion chamber.
The preheating burner 21 rapidly preheats the air in the first combustion chamber through the first combustion chamber, so that the heat load ratio in the first combustion chamber is adjusted within the range of 20% -50%, and the emission of nitrogen oxides and carbon monoxide in the mixed flue gas formed in the first combustion chamber is controlled to be about 10 ppm. As the high-temperature air combustion is volume combustion or dispersion combustion, the reaction rate is low, the local heat release is less, the heat flow distribution is uniform, the combustion peak temperature is low, and the noise is very small.
Compared with the traditional small-area local high-temperature combustion, the high-temperature air combustion of the 16L gas water heater with the burner provided by the embodiment is carried out in a large area, even the whole second combustion chamber, the flame front in the second combustion chamber disappears, the generation of pollutants such as nitrogen oxides, carbon monoxide and the like is obviously reduced, and the overall temperature of the second combustion chamber is improved and the radiation heat transfer is enhanced. The second combustion chamber is internally combusted to form high-temperature flue gas, and the heat load of the second combustion chamber is 50% -80%. The heat load ratio of the second combustion chamber is controlled in the range, so that the second combustion chamber achieves soft combustion and low-noise combustion, combustion noise of the gas water heater can be reduced, and environmental pollution caused by the fact that high-temperature flue gas generated by high-temperature air combustion is rich in nitrogen and carbon dioxide is relatively reduced.
The gas distribution device is used for controlling the amount of the gas input into the second combustion chamber, so that the heat load ratio generated by the combustion of the high-temperature air in the second combustion chamber can be kept in a preset range, the second combustion chamber is further kept in a preset combustion state, and the emission amount of harmful gas is reduced.
Optionally, the burner further comprises a premixer 22 arranged on the housing 20 for introducing fuel gas and air to be premixed to form a mixed gas and delivering the mixed gas to the preheating burner 21 and the gas distribution device. The premixer 22 has an air inlet 23 and a gas inlet 24 for introducing air and gas, respectively, and mixing to form a mixed gas and delivering to the pre-heat burner 21 and the gas distribution device. The premixer 22 is used for premixing the gas, so that the uniformity of the gas can be improved, and the combustion efficiency of the gas can be improved.
Further optionally, the burner further comprises a distributor 25 arranged on the housing 20 and connected to the premixer 22 for delivering the mixed gas formed by the premixer 22 to the preheating burner 21 and the gas distributing device, respectively. The distributor 25 has an inlet end connected to the premixer 22 and an outlet end connected to the pre-heating burner 21 and the gas distribution means, respectively, to achieve pre-distribution of the gas.
The invention further provides an embodiment of the water heater.
Referring to fig. 10 and 11, the water heater includes a body 10, a burner according to any of the above embodiments provided on the body 10, and a heat exchanger 11 provided on the body 10 and connected to the second combustion chamber for exchanging heat with flue gas generated by the combustion reaction of high temperature air of the burner.
The heat exchanger 11 has a preset heat load range according to the required working condition, and high-temperature air of the burner is combusted to generate high-temperature flue gas, and the high-temperature flue gas exchanges heat with the heat exchange tube 12 of the heat exchanger 11 to generate hot water. The water heater may further include a smoke collecting hood 13 and a smoke exhaust pipe to which cooled smoke generated through heat exchange of the heat exchanger 11 is exhausted through the smoke collecting hood 13 to discharge the smoke in a preset direction and a preset position.
Optionally, the water heater further comprises a temperature sensor for the temperature in the second combustion chamber, a controller electrically connected with the machine body 10 and the temperature sensor for acquiring the temperature in the second combustion chamber and the heat load required by the water heater, and a driving mechanism 36 for controlling the gas distribution device to drive the valve shaft 35 to rotate and switch from the first position to the second position when the temperature in the second combustion chamber reaches the preset temperature so as to enable the gas distribution device to deliver gas to the second combustion chamber for high-temperature air combustion to reach the heat load range required by the water heater. When the valve shaft 35 of the gas distribution device is rotated and switched between the first position and the second position, the amount of fuel gas supplied to the burner changes, and the thermal load changes relatively. The rotation of the valve shaft 35 is controlled by the controller, so that the water heater can meet the heat load range of the water heater under the current working condition, and harmful gases such as nitrogen oxides, carbon monoxide and the like generated by the water heater are reduced. The controller may employ existing software to drive and control the drive mechanism 36.
The invention also provides a control method of the water heater, which is used for the water heater according to any embodiment.
The control method comprises the following steps:
And S100, acquiring the temperature in the second combustion chamber and the heat load required by the water heater.
And 200, when the temperature in the second combustion chamber reaches the preset temperature, controlling the driving mechanism 36 of the gas distribution device to drive the valve shaft 35 to rotate and switch from the first position to the second position, so that the gas distribution device can deliver gas to the second combustion chamber to burn high-temperature air, and the required heat load range of the water heater is reached.
The heat load of the water heater is adapted to the current working condition, and the heat load of the water heater is influenced by the gas quantity input by the gas distribution device of the burner. In the process of driving the valve shaft 35 to rotate by the driving mechanism 36, when the driving mechanism 36 drives the valve shaft 35 to reach a preset position, the heat load generated by the burner is relatively determined and is matched with the required heat load of the water heater, so that the problem of harmful gas increase caused by insufficient combustion of fuel gas is avoided.
Claims (11)
1. A gas distribution apparatus for a burner, the gas distribution apparatus comprising:
The shell is provided with a gas distribution chamber, and a gas inlet and a gas outlet which are respectively communicated with the gas distribution chamber;
a valve shaft rotatably disposed in the gas distribution chamber between a first position and a second position and dividing the gas distribution chamber into an air inlet chamber communicating with the air inlet and an air outlet chamber communicating with the air outlet, the valve shaft being provided with an overflow hole, and
The driving mechanism is in driving connection with the valve shaft and is used for driving the valve shaft to rotate and switch between the first position and the second position, when the valve shaft is positioned at the first position, the overflow hole is staggered with the air inlet cavity and/or the air outlet cavity, and when the valve shaft rotates and switches from the first position to the second position, the overflow hole is communicated with the air inlet cavity and the air outlet cavity, and the effective through flow of the overflow hole is gradually increased;
The gas distribution apparatus further includes:
The positioning part is arranged in the gas distribution chamber, a containing cavity for containing the valve shaft, a third air flow hole for communicating the containing cavity with the air inlet cavity and a fourth air flow hole for communicating the containing cavity with the air outlet cavity are formed in the positioning part, and the valve shaft is rotatably arranged in the containing cavity;
When the valve shaft is positioned at the first position, the overflow hole and the third air flow hole and/or the fourth air flow hole are staggered, and when the valve shaft is switched from the first position to the second position in a rotating way, the overflow hole is communicated with the third air flow hole and the fourth air flow hole, and the effective through flow of the overflow hole is gradually increased;
The air outlet is provided with a plurality of nozzles, and the nozzles are arranged at intervals along the axial direction of the valve shaft;
The number of the overflow holes is multiple, the overflow holes are arranged at intervals along the axial direction of the valve shaft, the overflow holes are arranged in one-to-one correspondence with the nozzles, or the overflow holes are strip holes arranged along the axial direction of the valve shaft.
2. The gas distribution device according to claim 1, wherein the valve shaft is provided with an overflow cavity therein, the overflow hole comprises a first gas flow hole and a second gas flow hole which are respectively communicated with the overflow cavity, the first gas flow hole is used for being communicated with the gas inlet cavity, and the second gas flow hole is used for being communicated with the gas outlet cavity when the valve is axially switched to the second position.
3. The gas distribution device of claim 1, wherein the volume of the gas outlet chamber is greater than the volume of the gas inlet chamber.
4. A gas distribution arrangement according to any one of claims 1 to 3, wherein the direction of the gas flow from the gas outlet is arranged at an angle to the direction of the gas flow from the gas inlet.
5. The gas distribution apparatus according to claim 4, wherein a flow guiding surface for guiding the flow of the gas toward the gas outlet is formed on an inner wall surface of the gas outlet chamber.
6. A burner for a gas turbine, which burner comprises a burner body, characterized by comprising the following steps:
A housing in which a first combustion chamber and a second combustion chamber are formed to communicate with each other;
a preheating burner arranged on the shell for burning to form mixed gas to heat the air in the first combustion chamber to a preset temperature and convey the air to the second combustion chamber, and
The gas distribution apparatus according to any one of claims 1 to 5, provided in the housing, for injecting gas into the second combustion chamber to cause a high-temperature air combustion reaction in the second combustion chamber.
7. The burner of claim 6, wherein the burner further comprises:
The pre-mixer is arranged on the shell and is used for introducing fuel gas and air for pre-mixing to form mixed gas and conveying the mixed gas to the preheating burner and the gas distribution device.
8. The burner of claim 7, wherein the burner further comprises:
And the distributor is arranged on the shell, connected with the premixer and used for respectively conveying the mixed gas formed by the premixer to the preheating burner and the gas distribution device.
9. A water heater, comprising:
A body;
A burner according to any one of claims 6 to 8, provided to said body, and
And the heat exchanger is arranged on the machine body, connected with the second combustion chamber and used for carrying out heat exchange with the flue gas generated by the high-temperature air combustion reaction of the burner.
10. The water heater as recited in claim 9, further comprising:
a temperature sensor for the temperature in the second combustion chamber, and
And the controller is electrically connected with the machine body and the temperature sensor and is used for acquiring the temperature in the second combustion chamber and the heat load required by the water heater, and the controller is also used for controlling the driving mechanism of the gas distribution device to drive the valve shaft to rotate and switch from the first position to the second position when the temperature in the second combustion chamber reaches the preset temperature so as to enable the gas distribution device to transmit gas to the second combustion chamber for high-temperature air combustion so as to reach the heat load range required by the water heater.
11. A control method of a water heater for a water heater as claimed in claim 9 or 10, the control method comprising:
acquiring the temperature in the second combustion chamber and the heat load required by the water heater, and
When the temperature in the second combustion chamber reaches the preset temperature, the driving mechanism of the gas distribution device is controlled to drive the valve shaft to rotate and switch from the first position to the second position, so that the gas distribution device can deliver gas to the second combustion chamber to burn high-temperature air, and the required heat load range of the water heater is achieved.
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| CN111750535A (en) * | 2019-03-29 | 2020-10-09 | 宁波方太厨具有限公司 | Gas distribution device and gas water heater using same |
| CN211667193U (en) * | 2019-12-31 | 2020-10-13 | 芜湖美的厨卫电器制造有限公司 | Gas distribution units and gas heating units |
| CN215637164U (en) * | 2021-04-19 | 2022-01-25 | 芜湖美的厨卫电器制造有限公司 | Gas distribution device, combustor and water heater |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB815370A (en) * | 1955-10-19 | 1959-06-24 | R & A Main Ltd | Improvements in or relating to means for controlling the flow of gas to a burner |
| AUPQ214099A0 (en) * | 1999-08-09 | 1999-09-02 | Advanced Products Pty Ltd | Gas control assembly |
| CN106678794B (en) * | 2017-03-24 | 2019-01-18 | 佛山市凯基热能科技有限公司 | A kind of combustion heater |
| CN111750537B (en) * | 2019-03-29 | 2021-05-18 | 宁波方太厨具有限公司 | Gas distribution device and gas water heater using same |
| CN212618284U (en) * | 2019-10-17 | 2021-02-26 | 芜湖美的厨卫电器制造有限公司 | Combustor and gas water heater |
| CN111550786A (en) * | 2020-05-26 | 2020-08-18 | 珠海格力电器股份有限公司 | Gas distributor, gas water heater and method of segmented combustion thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750535A (en) * | 2019-03-29 | 2020-10-09 | 宁波方太厨具有限公司 | Gas distribution device and gas water heater using same |
| CN211667193U (en) * | 2019-12-31 | 2020-10-13 | 芜湖美的厨卫电器制造有限公司 | Gas distribution units and gas heating units |
| CN215637164U (en) * | 2021-04-19 | 2022-01-25 | 芜湖美的厨卫电器制造有限公司 | Gas distribution device, combustor and water heater |
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