CN111947296B - Control method of full-premix gas water heater - Google Patents
Control method of full-premix gas water heater Download PDFInfo
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- CN111947296B CN111947296B CN202010705486.4A CN202010705486A CN111947296B CN 111947296 B CN111947296 B CN 111947296B CN 202010705486 A CN202010705486 A CN 202010705486A CN 111947296 B CN111947296 B CN 111947296B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 210
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002485 combustion reaction Methods 0.000 claims abstract description 93
- 239000000446 fuel Substances 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims description 179
- 230000001105 regulatory effect Effects 0.000 claims description 32
- 239000000779 smoke Substances 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 16
- 239000002737 fuel gas Substances 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims 3
- 230000033228 biological regulation Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel
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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, e.g. noise reduction means
-
- 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, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
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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, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
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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
-
- 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
Abstract
The invention belongs to the technical field of gas water heaters, and particularly relates to a full-premix gas water heater and a control method. The gas flow distribution assembly of the fully premixed gas water heater is arranged on an air flow channel between the air-fuel proportional valve and the Venturi premixer and used for changing the pressure at the rear end of the air-fuel proportional valve by adjusting the opening degree of the air flow channel; the air inlet end of the fan is connected with the air outlet of the Venturi premixer, and the air outlet end of the fan is connected with the combustor; the air flow limiting assembly is arranged on the Venturi premixer and is used for adjusting the opening degree of an air inlet of the Venturi premixer. The control method will determine whether the required combustion load is not less than PnminTherefore, whether the gas flow distribution assembly and the air flow limiting assembly need to be adjusted or not is judged. The fully premixed gas water heater and the control method both effectively solve the problem that the minimum combustion load of the existing fully premixed gas water heater is large.
Description
Technical Field
The invention belongs to the technical field of gas water heaters, and particularly relates to a full-premix gas water heater and a control method.
Background
The gas water heater is equipment which takes gas as fuel and quickly prepares hot water through gas combustion; the fully premixed gas water heater burns after gas and air are completely mixed before the water heater burns, and no secondary air participates in the burning process, so that the gas water heater adopting the burning mode is called as a fully premixed gas water heater.
At present, an air-fuel proportional valve structure is generally adopted by a low-power (below 50 KW) full-premix gas water heater, negative pressure is generated at the rear end of gas of the air-fuel proportional valve by virtue of a Venturi premixer and a fan, and the negative pressure at the rear end of the air-fuel proportional valve is adjusted by changing the rotating speed of the fan, so that the combustion load of the full-premix gas water heater is adjusted. For example, the larger the fan rotation speed is, the larger the generated negative pressure is, the larger the opening degree of the air-fuel proportional valve is, and the larger the combustion load is; otherwise, the size becomes smaller.
However, this type of load adjustment also has its own disadvantage in that the minimum value of the load adjustment ratio (the ratio of the minimum combustion load to the maximum combustion load) is generally 1:5, i.e., the minimum value of the load adjustment ratio is relatively large. The reason is that the rotating speed of the fan can not be infinitely low, the rotating speed of the existing fan can only be about 1000r/min generally, so that the minimum combustion load of the full premix gas water heater is too high, and the minimum value of the load regulation ratio is larger, so that the water outlet temperature of the water heater is too high when people take a bath in summer, and the comfort of the user in using the full premix gas water heater is influenced.
Disclosure of Invention
In order to solve the problem that the minimum combustion load of the existing full-premix gas water heater is large, the invention provides a full-premix gas water heater.
Another object of the present invention is to provide a control method for the fully premixed gas water heater.
The invention is realized by adopting the following scheme:
the invention provides a full-premixing gas water heater, which comprises an air-fuel proportional valve, a gas flow distribution assembly, a Venturi premixer, an air flow limiting assembly, a fan, a combustor and a control unit, wherein the air-fuel proportional valve is connected with the venturi premixer;
the gas flow distribution assembly is arranged on an air flow channel between the air-fuel proportional valve and the Venturi premixer and is used for changing the pressure at the rear end of the air-fuel proportional valve by adjusting the opening degree of the air flow channel; the air inlet end of the fan is connected with the air outlet of the Venturi premixer, and the air outlet end of the fan is connected with the combustor; the air flow limiting assembly is arranged on the Venturi premixer and is used for adjusting the opening degree of an air inlet of the Venturi premixer;
the air-fuel proportional valve, the fuel gas flow distribution assembly, the air flow limiting assembly, the fan and the combustor are electrically connected with the control unit.
In a further development of the fully premixed gas water heater of the present invention, the gas flow distribution assembly includes a vent and a regulating valve in communication with the gas flow passage; the regulating valve is also electrically connected with the control unit and used for changing the opening degree of the airflow channel by regulating the opening degree of the vent hole.
In a further improvement of the fully premixed gas water heater of the present invention, the number of the vent holes is at least two, and the regulating valve is electrically connected to the control unit for changing the opening degree of the air flow channel by opening or closing one of the vent holes.
In a further improvement of the fully premixed gas water heater of the present invention, the two air vents are different in size, and the regulating valve is electrically connected to the control unit for changing the opening of the air flow passage by opening or closing the larger air vent.
The fully premixed gas water heater is further improved in that the gas flow distribution assembly further comprises a shell, wherein the shell is provided with a vent hole, an air inlet and an air outlet which are communicated with the vent hole; the regulating valve is mounted on the housing.
In a further development of the fully premixed gas water heater of the present invention, the air restrictor assembly comprises a drive member and a valve;
the valve is installed air inlet department of venturi premixer, the driving piece with the control unit electric connection, the driving piece still with the valve is connected and is used for the drive the valve is in order to adjust the aperture of venturi premixer's air inlet.
The fully premixed gas water heater is further improved in that the driving piece is connected with the valve and used for driving the valve to rotate circumferentially relative to the air inlet of the venturi premixer so as to adjust the opening degree of the air inlet of the venturi premixer.
The full premix gas water heater of the invention is further improved in that the full premix gas water heater also comprises a heat exchange assembly, a smoke collecting hood and a smoke exhaust pipe; the heat exchange assembly is connected with the combustor, the smoke collecting cover is connected with the heat exchange assembly, and the smoke exhaust pipe is installed at the smoke exhaust port of the smoke collecting cover.
The fully premixed gas water heater is further improved in that the heat exchange assembly comprises a heat exchanger, a cold water pipe and a hot water pipe; the cold water pipe is communicated with a cold water inlet of the heat exchanger, and the hot water pipe is communicated with a hot water outlet pipe of the heat exchanger.
The full premix gas water heater of the invention is further improved in that the full premix gas water heater also comprises an outlet water temperature detection unit, an inlet water temperature detection unit and a water flow detection unit which are electrically connected with the control unit; the outlet water temperature detection unit is installed on the hot water pipe, the inlet water temperature detection unit is installed on the cold water pipe, and the water flow detection unit is installed on the water flow channel.
The invention also provides a control method of the fully premixed gas water heater, which comprises the following steps:
starting the fully premixed gas water heater and calculating the required combustion load P of the fully premixed gas water heater1；
If P1≥PnminThen, the opening degree of the airflow channel is maintained to be maximum, the opening degree of an air inlet of the Venturi premixer is maintained to be maximum, and meanwhile, the rotating speed of the fan is adjusted to enable the actual combustion load P to be larger2To achieve the required combustion load P1To date, Pnmin＜P2≤Pmax；
If P1＜PnminAdjusting the gas flow distribution assembly to minimize the opening of the gas flow passage, adjusting the air flow restriction assembly to minimize the opening of the air inlet of the venturi premixer, and simultaneously adjusting the rotational speed of the fan to minimize the actual combustion load P2To achieve the required combustion load P1To date, Pmin＜P2≤Pmax；
Wherein: pnminThe opening degree of the airflow channel is maximum, and the Venturi premixerThe opening degree of the air inlet is maximum, and the fan rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the corresponding first preset combustion load of the full premix gas water heater is obtained;
Pminthe opening degree of the air flow channel is minimum, the opening degree of the air inlet of the Venturi premixer is minimum, and the fan rotates at the minimum preset rotating speed NminWhen rotating, the minimum preset combustion load, P, corresponding to the fully premixed gas water heatermin＜Pnmin；
PmaxThe opening degree of the air flow channel is maximum, the opening degree of the air inlet of the Venturi premixer is maximum, and the fan is at the maximum preset rotating speed NmaxAnd when the gas water heater rotates, the maximum preset combustion load corresponding to the fully premixed gas water heater.
The control method of the fully premixed gas water heater is further improved in that the control method further comprises the following steps:
if P2＞PnminWhen the combustion load is plus delta P, the gas flow distribution assembly is adjusted to enable the opening degree of the airflow channel to be maximum, the air flow limiting assembly is adjusted to enable the opening degree of the air inlet of the Venturi premixer to be maximum, and meanwhile the rotating speed of the fan is adjusted to enable the actual combustion load P to be maximum2To achieve the required combustion load P1To a is P ofnmin+△P＜P2≤Pmax；
Wherein Δ P is a load increment threshold value when the opening degree of the airflow channel needs to be changed.
The control method of the full-premix gas water heater is further improved in that the P of the full-premix gas water heater is calculated according to the water inlet temperature, the water outlet temperature and the water flow1。
Compared with the prior art, the invention adopting the scheme has the beneficial effects that:
according to the fully premixed gas water heater, the control unit controls the gas flow distribution assembly to adjust the opening of the air flow channel, and the air flow channel is located between the air-fuel proportional valve and the venturi premixer, so that after the opening of the air flow channel is changed, the pressure at the rear end of the air-fuel proportional valve is changed, the control unit controls the opening of the air-fuel proportional valve to be changed, and further the combustion load of the fully premixed gas water heater is changed; meanwhile, in order to ensure the stability of the air-fuel ratio, the control unit can also simultaneously control the air flow limiting assembly to adjust the opening degree of the air inlet of the venturi premixer so as to enable the air quantity to be matched with the gas quantity. Therefore, if the opening degree of the air flow channel and the opening degree of the air inlet of the venturi pre-mixer are both reduced, the minimum combustion load of the fully pre-mixed gas water heater is reduced on the premise that the rotating speed of the fan is at the minimum preset rotating speed, and the problem that the minimum combustion load of the conventional fully pre-mixed gas water heater is large is effectively solved.
The control method of the invention firstly judges whether the required combustion load is not less than Pnmin(ii) a If yes, the fan is directly adjusted; if not, firstly adjusting the gas flow distribution assembly to ensure that the opening degree of the gas flow channel is changed from maximum to minimum, and adjusting the opening degree of the air-fuel proportional valve to adapt to the pressure at the rear end of the air-fuel proportional valve because the pressure at the rear end of the air-fuel proportional valve is increased; in order to ensure the stability of the air-fuel ratio, the air flow limiting assembly is correspondingly adjusted to change the opening degree of the air inlet of the Venturi premixer from maximum to minimum, so that the combustion load of the full-premixing gas water heater is relatively reduced, and the problem that the minimum combustion load of the conventional full-premixing gas water heater is larger is effectively solved.
Drawings
FIG. 1 is a schematic structural diagram of a fully premixed gas water heater according to embodiment 1 of the present invention; the arrows in the figure represent the gas flow direction;
FIG. 2 is an enlarged view of the structure at A in example 1 of the present invention; the arrows in the figure represent the gas flow direction;
FIG. 3 is an enlarged view of the structure at B in example 1 of the present invention;
fig. 4 is a flowchart of a control method of a fully premixed gas water heater according to embodiment 2 of the present invention.
In the figure: 1. an air-fuel ratio valve; 2. a gas flow distribution assembly; 3. a venturi premixer; 4. an air flow restriction assembly; 5. a fan; 6. a burner; 7. a control unit; 8. a heat exchange assembly; 9. a smoke collecting hood; 10. A smoke exhaust pipe; 21. an air inlet; 22. an air outlet; 23. adjusting a valve; 24. a housing; 26. a vent hole; 41. A drive member; 42. a valve; 81. a heat exchanger; 82. a cold water pipe; 83. a hot water pipe; 261. a large vent hole; 262. a small vent hole.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "axial," "radial," and the like are used in the positional or orientational relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and thus should not be construed as limiting the present invention.
Further, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
As shown in fig. 1, the present embodiment 1 provides a fully premixed gas water heater, which includes an air-fuel proportional valve 1, a gas flow distribution assembly 2, a venturi pre-mixer 3, an air flow limiting assembly 4, a fan 5, a burner 6 and a control unit 7;
the gas flow distribution component 2 is arranged on an air flow channel between the air-fuel proportional valve 1 and the venturi pre-mixer 3 and is used for changing the pressure at the rear end of the air-fuel proportional valve 1 by adjusting the opening degree of the air flow channel; the air inlet end of the fan 5 is connected with the air outlet of the venturi premixer 3, and the air outlet end of the fan 5 is connected with the combustor 6; the air flow limiting assembly 4 is arranged on the venturi premixer 3 and is used for adjusting the opening degree of an air inlet of the venturi premixer 3;
the air-fuel ratio valve 1, the gas flow distribution component 2, the air flow limiting component 4, the fan 5 and the burner 6 are all electrically connected with the control unit 7.
In the embodiment, the control unit 7 controls the gas flow distribution assembly 2 to adjust the opening degree of the gas flow channel, and because the gas flow channel is positioned between the air-fuel proportional valve 1 and the venturi premixer 3, when the opening degree of the gas flow channel is changed, the pressure at the rear end of the air-fuel proportional valve 1 is changed, and the control unit 7 controls the opening degree of the air-fuel proportional valve 1 to change, so as to change the combustion load of the fully premixed gas water heater; meanwhile, in order to ensure the stability of the air-fuel ratio, the control unit 7 controls the air restriction assembly 4 to adjust the opening degree of the air inlet of the venturi premixer 3 so that the air quantity matches the gas quantity.
For example, when the fan 5 rotates at the minimum rotation speed and the control unit 7 controls the gas flow distribution assembly 2 to minimize the opening of the air flow channel and increase the resistance at the rear end of the air-fuel proportional valve 1, the control unit 7 controls the opening of the air-fuel proportional valve 1 to decrease, and at the same time, in order to ensure the stability of the air-fuel ratio, the control unit 7 also simultaneously controls the air restriction assembly 4 to correspondingly decrease the opening of the air inlet of the venturi pre-mixer 3 and ensure that the air quantity is matched with the gas quantity, so that the minimum combustion load of the fully pre-mixed gas water heater is further reduced, and the problem of large minimum combustion load of the conventional fully pre-mixed gas water heater is effectively solved.
Preferably, the control unit 7 may be a device such as a single chip microcomputer capable of receiving information and controlling the operation process of other components according to the received information.
Preferably, the fan 5 may be a direct current variable frequency fan.
In a particular embodiment, the gas flow distribution assembly 2 comprises a vent 26 and a regulating valve 23 in communication with the gas flow passage; the regulating valve 23 is electrically connected to the control unit 7 for changing the opening degree of the air flow passage by adjusting the opening degree of the vent hole 26.
When the opening degree of the airflow channel needs to be changed, the control unit 7 controls the regulating valve 23 to act, and the opening degree of the airflow channel is changed by changing the opening degree of the vent hole 26; the opening degree of the air flow passage changes, causing the pressure at the rear end of the air-fuel ratio valve 1 to change.
Further, as shown in fig. 2, the number of the vent holes 26 is at least two, and the adjusting valve 23 is electrically connected to the control unit 7 for changing the opening degree of the airflow channel by opening or closing one of the vent holes 26.
When the regulating valve 23 is changed from opening one of the vent holes 26 to closing the vent hole 26, the opening degree of the airflow channel is reduced, and the pressure at the rear end of the air-fuel ratio valve 1 is increased; at this time, the control unit 7 controls the air-fuel proportional valve 1 to reduce the opening degree thereof, so that less fuel gas enters the air flow channel through the air-fuel proportional valve 1; meanwhile, in order to ensure that the air-fuel ratio of the fully premixed gas water heater of the embodiment is unchanged, the corresponding control unit 7 controls the air flow restriction assembly 4 to operate so as to reduce the opening degree of the air inlet of the venturi pre-mixer 3, thereby reducing the combustion load of the fully premixed gas water heater of the embodiment.
When the regulating valve 23 is changed from closing one of the vent holes 26 to opening the vent hole 26, the opening degree of the airflow channel is increased, and the pressure at the rear end of the air-fuel ratio valve 1 is further reduced; at this time, the control unit 7 controls the air-fuel proportional valve 1 to increase the opening degree thereof, so that more fuel gas enters the air flow channel through the air-fuel proportional valve 1; at the same time, in order to ensure that the air-fuel ratio of the fully premixed gas water heater of the present embodiment is unchanged, the corresponding control unit 7 controls the air restrictor assembly 4 to operate so as to increase the opening degree of the air inlet of the venturi premixer 3.
Further, the two air vents 26 are different in size, and the regulating valve 23 is electrically connected with the control unit 7 for changing the opening degree of the air flow passage by opening or closing the larger air vent 26.
As shown in fig. 2, the regulating valve 23 is used to change the opening degree of the gas flow passage by opening or closing the large vent 261.
When the regulating valve 23 closes the large vent hole 261, the gas flowing from the gas inlet 21 passes through the small vent hole 262, the gas outlet 22, re-flows into the gas flow passage, and finally flows into the venturi premixer 3.
When the large vent hole 261 is opened by the regulating valve 23, the gas flowing in from the gas inlet 21 flows to the gas outlet 22 through the small vent hole 262 and the large vent hole 261 simultaneously, and then flows into the gas flow channel again, and finally flows into the venturi premixer 3.
Further, the gas flow distribution assembly 2 further comprises a housing 24, the housing 24 is provided with a vent hole 26, and the gas inlet 21 and the gas outlet 22 are communicated with the vent hole 26; the regulating valve 23 is mounted on a housing 24.
The regulating valve 23 is preferably a solenoid valve.
In a particular embodiment, as shown in FIG. 3, air restriction assembly 4 includes a driver 41 and a valve 42;
the valve 42 is installed at the air inlet of the venturi pre-mixer 3, the driving member 41 is electrically connected to the control unit 7, and the driving member 41 is further connected to the valve 42 for driving the valve 42 to adjust the opening of the air inlet of the venturi pre-mixer 3.
When the air intake amount needs to be adjusted to ensure the stability of the air-fuel ratio, the control unit 7 controls the driving member 41 to be activated, and the driving member 41 drives the valve 42 to move, so as to achieve the purpose of adjusting the opening degree of the air inlet of the venturi premixer 3, and further achieve the purpose of changing the air intake amount.
Further, the driving member 41 is connected to the valve 42 for driving the valve 42 to rotate circumferentially relative to the air inlet of the venturi premixer 3 to adjust the opening degree of the air inlet of the venturi premixer 3.
The valve 42 is rotatably connected to the air inlet of the venturi pre-mixer 3, and when the driving member 41 is activated, the driving member 41 drives the valve 42 to rotate circumferentially relative to the air inlet of the venturi pre-mixer 3, so as to adjust the opening degree of the air inlet of the venturi pre-mixer 3.
Preferably, the valve 42 has two gears of circumferential rotation with respect to the air intake of the venturi premixer 3; when the valve 42 is rotated to one of the gears, the opening degree of the air inlet of the venturi premixer 3 is minimum, that is, the air inlet amount is minimum under the condition that the rotating speed of the fan 5 is unchanged; correspondingly, when the valve 42 is rotated to another gear, the opening degree of the air inlet of the venturi premixer 3 is maximum, that is, the air inlet amount is maximum under the condition that the rotation speed of the fan 5 is kept unchanged.
The drive 41 is preferably an electric motor.
In the specific embodiment, the fully premixed gas water heater further comprises a heat exchange assembly 8, a smoke collecting hood 9 and a smoke exhaust pipe 10; the heat exchange assembly 8 is connected with the combustor 6, the smoke collecting cover 9 is connected with the heat exchange assembly 8, and the smoke exhaust pipe 10 is installed at a smoke exhaust port of the smoke collecting cover 9.
The combustor 6 is used for heating the heat exchange assembly 8 to realize heat exchange, and the smoke collecting cover 9 is used for discharging flue gas generated by combustion out of the fully premixed gas water heater through the smoke discharging pipe 10.
Further, the heat exchange assembly 8 comprises a heat exchanger 81, a cold water pipe 82 and a hot water pipe 83; the cold water pipe 82 is communicated with a cold water inlet of the heat exchanger 81, and the hot water pipe 83 is communicated with a hot water outlet pipe of the heat exchanger 81.
Furthermore, the fully premixed gas water heater also comprises an outlet water temperature detection unit, an inlet water temperature detection unit and a water flow detection unit which are electrically connected with the control unit 7; the outlet water temperature detecting unit is installed on the hot water pipe 83, the inlet water temperature detecting unit is installed on the cold water pipe 82, and the water flow detecting unit is installed on the water flow passage.
Preferably, a water flow rate detecting unit is installed on the cold water pipe 82 for detecting the inflow water flow rate.
The outlet water temperature detection unit feeds the detected actual outlet water temperature back to the control unit 7, the inlet water temperature detection unit feeds the detected inlet water temperature back to the control unit 7, and the water flow detection unit feeds the detected water flow back to the control unit 7;
the control unit 7 calculates the required combustion load P of the fully premixed gas water heater according to the received information and by combining an internal algorithm1(ii) a The control unit 7 also determines the required combustion load P1Whether or not less than Pnmin；
If yes, the control unit 7 controls the regulating valve 23 of the gas flow distribution assembly 2 to maintain the state of opening the large vent 261, the control unit 7 controls the driving element 41 of the air flow limiting assembly 4 to maintain the closed state, at this time, the valve 42 is in a gear position which enables the opening degree of the air inlet of the venturi premixer 3 to be maximum, and simultaneously, the control unit 7 controls the fan 5 to be at the minimum preset rotating speed NminAnd the maximum preset rotating speed NmaxSo that the actual combustion load P is adjusted2To achieve the required combustion load P1Until the end;
if not, the control unit 7 controls the regulating valve 23 of the gas flow distribution assembly 2 to close the large vent 261, and at this time, the gas flowing out of the air-fuel proportional valve 1 flows to the venturi premixer 3 through the gas inlet 21, the small vent 262 and the gas outlet 22 in sequence, so that the pressure at the rear end of the air-fuel proportional valve 1 is increased, and the control unit 7 controls the air-fuel proportional valve 1 to reduce the opening degree; in order to ensure the stability of the air-fuel ratio, the control unit 7 also controls the driving member 41 of the air restriction assembly 4 to be activated, the driving member 41 drives the valve 42 to rotate to a gear position which can maintain the opening degree of the air inlet of the venturi pre-mixer 3 at a minimum, and then the control unit 7 controls the fan 5 at a minimum preset rotating speed NminAnd the maximum preset rotating speed NmaxSo that the actual combustion load P is adjusted2To achieve the required combustion load P1Until now.
In a specific embodiment, the fully premixed gas water heater further comprises a premixing cavity, and the premixing cavity is positioned between the fan 5 and the burner 6; the fully premixed gas flowing out of the air outlet of the fan 5 enters the premixing cavity for further mixing, and the premixing cavity also has the function of storing the fully premixed gas.
The working process is as follows:
when the fan 5 rotates at the minimum preset speed NminDuring rotation, the outlet temperature detection unit detects that the outlet temperature of the hot water pipe 83 is still greater than the preset temperature of the user, and at this time, the control unit 7 controls the regulating valve 23 (such as an electromagnetic valve) to close the large vent 261, so that the opening of the airflow channel is changed from maximum to minimum, and the minimum opening is maintained; at this time, if the rotation speed of the fan 5 is still unchanged, the pressure at the rear end of the air-fuel proportional valve 1 is increased, the control unit 7 controls the opening degree of the air-fuel proportional valve 1 to be reduced, and at the same time, in order to ensure the stability of the air-fuel ratio, the control unit 7 also simultaneously controls the driving element 41 to be started, and the driving element 41 drives the valve 42 to rotate circumferentially relative to the air inlet of the venturi premixer 3, so that the opening degree of the air inlet of the venturi premixer 3 is changed from the maximum to the minimum, and the minimum opening degree is maintained; therefore, the minimum combustion load of the fully premixed gas water heater is further reduced, the range of the load regulation ratio of the fully premixed gas water heater is larger than the range of the load regulation ratio of the fully premixed gas water heater without the gas flow distribution assembly 2 and the air flow limiting assembly 4, and the problem that the minimum combustion load of the conventional fully premixed gas water heater is large is effectively solved.
Example 2
As shown in fig. 4, the present embodiment provides a control method of a fully premixed gas water heater, which includes the following steps:
starting the fully premixed gas water heater and calculating the required combustion load P of the fully premixed gas water heater1；
If P1≥PnminThen, the opening degree of the air flow channel is maintained to be maximum, the opening degree of the air inlet of the Venturi premixer 3 is maintained to be maximum, and meanwhile, the rotating speed of the fan 5 is adjusted to ensure that the actual combustion load P is achieved2To achieve the required combustion load P1To date, Pnmin＜P2≤Pmax；
If P1＜PnminThen adjustThe gas flow distribution assembly 2 is adjusted to minimize the opening of the gas flow passage, the air restriction assembly 4 is adjusted to minimize the opening of the air inlet of the venturi premixer 3, and the rotational speed of the fan 5 is adjusted to minimize the actual combustion load P2To achieve the required combustion load P1To date, Pmin＜P2≤Pmax；
Wherein: pnminThe opening degree of the air flow channel is maximum, the opening degree of the air inlet of the Venturi pre-mixer 3 is maximum, and the fan 5 rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the corresponding first preset combustion load of the full premix gas water heater is obtained;
Pminthe opening degree of the air flow channel is minimum, the opening degree of the air inlet of the Venturi pre-mixer 3 is minimum, and the fan 5 rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the minimum preset combustion load corresponding to the full premix gas water heater is set; pmin＜Pnmin；
PmaxThe opening degree of the air flow channel is maximum, the opening degree of the air inlet of the Venturi premixer 3 is maximum, and the fan 5 is at the maximum preset rotating speed NmaxAnd when the gas water heater rotates, the maximum preset combustion load corresponding to the fully premixed gas water heater.
In the present embodiment, first, the required combustion load P is set1And PnminBy comparison, if P1≥PnminThe actual combustion load P can be adjusted by adjusting the rotation speed of the fan 52To achieve the required combustion load P1(ii) a And if P1＜PnminIt means that the actual combustion load P cannot be set merely by adjusting the rotational speed of the fan 52To achieve the required combustion load P1I.e. even if the gas water heater is fully premixed with PnminRunning, and still making the temperature of the outlet water higher than the preset temperature; therefore, at this time, it is necessary to adjust the gas flow distribution assembly 2 to minimize the opening of the air flow passage, adjust the air restriction assembly 4 to minimize the opening of the air inlet of the venturi premixer 3, and then adjust the rotation speed of the fan 5 to further minimize the actual combustion load P2To achieve the required combustion load P1。
Wherein the first predetermined combustion loadPnminMaximum predetermined combustion load PmaxMinimum preset rotation speed NminMaximum predetermined rotational speed NmaxMinimum preset combustion load PminThe numerical value can be a numerical value preset in the control system of the fully premixed gas water heater in advance, or any numerical value preset by an engineer according to the actual situation.
Under the condition that the rotating speed of the fan 5 is not changed, P3＞P4(ii) a Wherein P is3When the opening degree of the airflow channel is maximum and the opening degree of the air inlet of the Venturi premixer 3 is maintained to be maximum, the actual combustion load of the full-premixing gas water heater is obtained; p4The actual combustion load of the fully premixed gas water heater is the minimum opening of the air flow channel and the minimum opening of the air inlet of the Venturi premixer 3 is maintained.
When the opening degree of the air flow channel is maximum and the opening degree of the air inlet of the venturi pre-mixer 3 is maintained to be maximum, if the fan 5 is at the maximum preset rotating speed NmaxRotating, the actual combustion load P of the fully premixed gas water heater at the moment2Reach the maximum preset combustion load Pmax(ii) a If the fan 5 rotates at the minimum preset speed NminRotating, the actual combustion load P of the fully premixed gas water heater at the moment2Reaches a first preset combustion load Pnmin。
When the opening degree of the air flow channel is minimum and the opening degree of the air inlet of the venturi pre-mixer 3 is maintained to be minimum, if the fan 5 rotates at the maximum preset rotating speed NmaxRotating, the actual combustion load P of the fully premixed gas water heater at the moment2Reaches a second preset combustion load Pnmax(ii) a If the fan 5 rotates at the minimum preset speed NminRotating, the actual combustion load P of the fully premixed gas water heater at the moment2To a minimum preset combustion load Pmin。
Thus, Pmin、Pnmin、Pnmax、PmaxMay be Pmin＜Pnmin＜Pnmax＜Pmax。
The corresponding relation among the opening degree of the air flow channel, the opening degree of the air inlet of the venturi pre-mixer 3, the rotating speed of the fan 5 and the combustion load of the fully pre-mixed gas water heater is shown in table 1.
TABLE 1 corresponding relationship between the opening of the air flow passage, the opening of the air inlet of the venturi pre-mixer 3, the rotation speed of the fan 5, and the combustion load of the fully pre-mixed gas water heater
Further, in order to avoid the problem that the regulating valve 23 of the gas flow distributing assembly 2 is switched back and forth between opening and closing, the control method of the present embodiment further includes:
if the actual combustion load P2Satisfies the following conditions: p2＞PnminWhen the combustion load is plus delta P, the gas flow distribution component 2 is adjusted to maximize the opening of the air flow channel, the air flow limiting component 4 is adjusted to maximize the opening of the air inlet of the Venturi premixer 3, and the rotating speed of the fan 5 is adjusted to maximize the actual combustion load P2To achieve the required combustion load P1To a is P ofnmin+△P＜P2≤Pmax；
Wherein Δ P is a load increment threshold value when the opening degree of the airflow channel needs to be changed.
And the delta P is a numerical value preset in the control system of the fully premixed gas water heater in advance.
Further, the embodiment calculates the combustion load P required by the gas water heater according to the inlet water temperature, the outlet water temperature and the water flow1(ii) a This calculation is calculated from the internal algorithm of the fully premixed gas water heater.
The working process of this embodiment is specifically described with reference to embodiment 1:
starting the fully premixed gas water heater and setting the outlet water temperature TPreset ofWhen the hot water faucet is turned on, the burner 6 is ignited to burn to heat the heat exchanger 81, cold water enters the heat exchanger 81 from the cold water pipe 82, and hot water obtained through heat exchange flows out from the hot water pipe 83; at the same time, a water flow rate detecting unit (e.g., water flow rate sensor)) Detecting the water flow V in the cold water pipe 82 in real time; the outlet water temperature detecting unit (for example, outlet water temperature sensor) detects the actual outlet water temperature T of the hot water pipe 83 in real timeGo out(ii) a The inlet water temperature detecting unit (such as inlet water temperature sensor) detects the inlet water temperature T of the cold water pipe 82 in real timeInto；
The control unit 7 receives the outlet water temperature TGo outTemperature T of inlet waterIntoThe water flow V is mixed and is according to the outlet water temperature TGo outTemperature T of inlet waterIntoCalculating the required combustion load P of the fully premixed gas water heater by combining with the water flow V and an internal algorithm1；
The control unit 7 judges the combustion load P required by the full-premix gas water heater1Whether or not less than Pnmin；
If so, the control unit 7 controls the regulating valve 23 (e.g. an electromagnetic valve) to maintain the state of opening the large vent 261, i.e. to maintain the maximum opening of the air flow passage, the control unit 7 also controls the driving room 41 (e.g. a motor) to be kept closed, the valve 42 is maintained at the gear position enabling the maximum opening of the air inlet of the venturi pre-mixer 3, and the control unit 7 controls the fan 5 at the minimum preset rotating speed NminAnd the maximum preset rotating speed NmaxSo that the actual combustion load P is adjusted2To achieve the required combustion load P1To a is P ofnmin＜P2≤Pmax；
If not, the control unit 7 controls the regulating valve 23 to close the large vent 261 to minimize the opening of the air flow channel, and because the opening of the air flow channel is minimized, the pressure at the rear end of the air-fuel proportional valve 1 is increased, and then the opening of the air-fuel proportional valve 1 is decreased, and meanwhile, in order to ensure the stability of the air-fuel ratio, the control unit 7 correspondingly controls the driving compartment 41 to start to drive the valve 42 to rotate relative to the air inlet of the venturi premixer 3 until reaching a gear which can minimize the opening of the air inlet of the venturi premixer 3, the driving compartment 41 stops, and the valve 42 is kept at the gear; at the same time, the control unit 7 controls the fan 5 to rotate at the minimum preset rotating speed NminAnd the maximum preset rotating speed NmaxWithin the range of (1) to adjust the rotation speed so as to make the actual combustion loadP2To reach Pnmin+. DELTA P (P at this time)min＜P2≤Pnmin+. Δ P), current combustion load P2To reach PnminA + Δ P indicating that the regulating valve 23 of the fully premixed gas water heater reaches a switching condition, that is, the regulating valve 23 needs to be switched from a state of closing the large vent 261 to a state of opening the large vent 261;
so that the inter-combustion load P2Satisfies the following conditions: p2＞PnminWhen the rotation speed is + Δ P, the control unit 7 controls the regulating valve 23 to open the large vent 261, controls the driving member 41 to start again, so that the valve 42 returns to the gear position enabling the opening degree of the air inlet of the venturi premixer 3 to be maximum, and simultaneously, the control unit 7 controls the fan 5 to rotate at the minimum preset rotation speed NminAnd the maximum preset rotating speed NmaxIs adjusted within the range of (1) so that the actual combustion load P is2To achieve the required combustion load P1P at this timenmin+△P＜P2≤Pmax；
When the fully premixed gas water heater of the present embodiment is not needed, the fully premixed gas water heater is closed, the large vent 261 is opened by the regulating valve 23, and the valve 42 is set to a position that enables the opening degree of the air inlet of the venturi premixer 3 to be the maximum.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the described parent features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A control method of a fully premixed gas water heater is characterized by comprising the following steps:
starting the fully premixed gas water heater, and calculating the required combustion load P of the fully premixed gas water heater according to the inlet water temperature, the outlet water temperature and the water flow1；
If P1≥PnminThen the opening degree of the gas flow channel is maintained to be maximum, the opening degree of the air inlet of the Venturi premixer (3) is maintained to be maximum, and meanwhile, the rotating speed of the fan (5) is adjusted to ensure that the actual combustion load P is increased2To achieve the required combustion load P1To date, Pnmin＜P2≤Pmax；
If P1＜PnminAdjusting a gas flow distribution component (2) arranged on a gas flow channel between the air-fuel proportional valve (1) and the Venturi premixer (3) to ensure that the opening degree of the gas flow channel is converted into minimum, adjusting an air flow limiting component (4) arranged on the Venturi premixer (3) to ensure that the opening degree of an air inlet of the Venturi premixer (3) is converted into minimum, and simultaneously adjusting the rotating speed of a fan (5) to ensure that the actual combustion load P is adjusted2To achieve the required combustion load P1To date, Pmin＜P2≤Pmax；
Wherein: pnminThe opening degree of the gas flow channel is maximum, the opening degree of the air inlet of the Venturi premixer (3) is maximum, and the fan (5) rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the corresponding first preset combustion load of the full premix gas water heater is obtained;
Pminthe opening degree of an air flow channel of the fuel gas is minimum, the opening degree of an air inlet of the Venturi premixer (3) is minimum, and the fan (5) rotates at the minimum preset rotating speed NminWhen rotating, the minimum preset combustion load, P, corresponding to the fully premixed gas water heatermin＜Pnmin；
PmaxGas flow channel for gasIs the largest, the opening degree of the air inlet of the Venturi premixer (3) is the largest, and the fan (5) rotates at the maximum preset rotating speed NmaxWhen the gas water heater rotates, the maximum preset combustion load corresponding to the full-premix gas water heater is set;
the fully premixed gas water heater comprises an air-fuel proportional valve (1), a gas flow distribution assembly (2), a Venturi premixer (3), an air flow limiting assembly (4), a fan (5), a combustor (6) and a control unit (7);
the gas flow distribution assembly (2) is arranged on an air flow channel between the air-fuel proportional valve (1) and the Venturi premixer (3) and is used for changing the pressure at the rear end of the air-fuel proportional valve (1) by adjusting the opening of the air flow channel; the air inlet end of the fan (5) is connected with the air outlet of the venturi premixer (3), and the air outlet end of the fan (5) is connected with the combustor (6); the air flow limiting assembly (4) is arranged on the Venturi premixer (3) and is used for adjusting the opening degree of an air inlet of the Venturi premixer (3);
the air-fuel proportional valve (1), the gas flow distribution assembly (2), the air flow limiting assembly (4), the fan (5) and the combustor (6) are electrically connected with the control unit (7);
the gas flow distribution assembly (2) comprises a vent hole (26) communicated with the gas flow channel and a regulating valve (23); the regulating valve (23) is electrically connected with the control unit (7) and is used for changing the opening degree of the airflow channel by adjusting the opening degree of the vent hole (26).
2. The control method of a fully premixed gas water heater as claimed in claim 1, further comprising:
if P2＞PnminWhen the combustion load is plus delta P, the gas flow distribution component (2) is adjusted to enable the opening degree of the airflow channel to be maximum, the air flow limiting component (4) is adjusted to enable the opening degree of the air inlet of the Venturi premixer (3) to be maximum, and meanwhile, the rotating speed of the fan (5) is adjusted to enable the actual combustion load P to be maximum2To achieve the required combustionLoad P1To a is P ofnmin+△P＜P2≤Pmax；
Wherein, Δ P is a load increment threshold value when the opening of the gas flow channel needs to be changed.
3. The control method of a fully premixed gas water heater according to claim 1, wherein the number of the vent holes (26) is at least two, and the regulating valve (23) is electrically connected with the control unit (7) for changing the opening degree of the air flow passage by opening or closing one of the vent holes (26).
4. The control method of a fully premixed gas water heater according to claim 3, characterized in that the two air vents (26) are different in size, and the regulating valve (23) is electrically connected with the control unit (7) for changing the opening degree of the air flow channel by opening or closing the larger air vent (26).
5. The control method of a fully premixed gas water heater according to claim 1, wherein the gas flow distributing assembly (2) further comprises a housing (24), the housing (24) being provided with a vent hole (26), and an air inlet (21), an air outlet (22) communicating with the vent hole (26); the regulating valve (23) is mounted on the housing (24).
6. Control method of a fully premixed gas water heater according to claim 1, characterized in that the air restriction assembly (4) comprises a driver (41) and a valve (42);
valve (42) are installed the air intake department of venturi premixer (3), driving piece (41) with the control unit (7) electric connection, driving piece (41) still with valve (42) are connected and are used for the drive valve (42) are in order to adjust the aperture of the air intake of venturi premixer (3).
7. The control method of a fully premixed gas water heater according to claim 6, characterized in that the driver (41) is connected with the valve (42) for driving the valve (42) to rotate circumferentially with respect to the air intake of the venturi premixer (3) for adjusting the opening of the air intake of the venturi premixer (3).
8. The control method of a fully premixed gas water heater according to claim 1, characterized in that the fully premixed gas water heater further comprises a heat exchange assembly (8), a fume collecting hood (9) and a fume exhaust pipe (10); heat exchange assembly (8) with combustor (6) are connected, collection petticoat pipe (9) with heat exchange assembly (8) are connected, install fume exhaust pipe (10) the smoke vent department of collection petticoat pipe (9).
9. The control method of a fully premixed gas water heater according to claim 8, wherein the heat exchange assembly (8) comprises a heat exchanger (81), a cold water pipe (82) and a hot water pipe (83); the cold water pipe (82) is communicated with a cold water inlet of the heat exchanger (81), and the hot water pipe (83) is communicated with a hot water outlet pipe of the heat exchanger (81).
10. The control method of the fully premixed gas water heater according to claim 9, wherein the fully premixed gas water heater further comprises an outlet water temperature detecting unit, an inlet water temperature detecting unit, and a water flow rate detecting unit all electrically connected to the control unit (7); the outlet water temperature detection unit is arranged on the hot water pipe (83), the inlet water temperature detection unit is arranged on the cold water pipe (82), and the water flow detection unit is arranged on a water flow channel.
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| CN113446736A (en) * | 2021-06-01 | 2021-09-28 | 深圳市合信达控制系统有限公司 | Air path structure, fully-premixed flow control method and device, and storage medium |
| WO2023274381A1 (en) * | 2021-06-30 | 2023-01-05 | 芜湖美的厨卫电器制造有限公司 | Combustor assembly and gas water heater device |
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| US7111460B2 (en) * | 2000-03-02 | 2006-09-26 | New Power Concepts Llc | Metering fuel pump |
| DE10340045A1 (en) * | 2003-08-28 | 2005-03-24 | Karl Dungs Gmbh & Co. Kg | Ratio controller with dynamic ratio formation |
| KR101214745B1 (en) * | 2011-03-25 | 2012-12-21 | 주식회사 경동나비엔 | Gas-air mixer with branch fluid paths |
| CN103994581B (en) * | 2014-05-04 | 2017-01-18 | 广东万和新电气股份有限公司 | Fully-premixed combustion water heater with gas inlet device |
| CN104214777B (en) * | 2014-09-29 | 2016-12-07 | 广东万和新电气股份有限公司 | The gas utensil of full premix combustion |
| CN204176926U (en) * | 2014-10-17 | 2015-02-25 | 广东万和新电气股份有限公司 | The gas-fired water heater of self adaptation full premix combustion |
| CN105509298B (en) * | 2016-01-06 | 2019-01-29 | 佛山市沃克曼普电气有限公司 | The adaptive premixed combustion heating device of the gas sensing formula being placed in water circuit system |
| EP3301363B1 (en) * | 2016-09-30 | 2019-08-28 | Siemens Aktiengesellschaft | Combustion unit with a burner and flow measurement of turbulent flows |
| CN109373318A (en) * | 2018-10-17 | 2019-02-22 | 华帝股份有限公司 | Nozzle capable of adapting to various fuel gases |
| CN110207398B (en) * | 2018-12-13 | 2021-05-18 | 华帝股份有限公司 | Control method for self-adaptive full-premix combustion of gas water heater |
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| CN109838808A (en) * | 2019-03-26 | 2019-06-04 | 广东万和新电气股份有限公司 | Heat load adjusting device and fully pre-mixing gas combustion water heater |
| CN210320689U (en) * | 2019-04-30 | 2020-04-14 | 华帝股份有限公司 | Gas water heater |
| CN210568397U (en) * | 2019-05-14 | 2020-05-19 | 广东万和新电气股份有限公司 | Full-premixing gas device |
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