CN112146281A - Control method of fully-premixed gas water heater and gas water heater thereof - Google Patents
Control method of fully-premixed gas water heater and gas water heater thereof Download PDFInfo
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- CN112146281A CN112146281A CN201910576575.0A CN201910576575A CN112146281A CN 112146281 A CN112146281 A CN 112146281A CN 201910576575 A CN201910576575 A CN 201910576575A CN 112146281 A CN112146281 A CN 112146281A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 24
- 230000001276 controlling effect Effects 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 122
- 239000002737 fuel gas Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
Abstract
The invention discloses a control method of a fully premixed gas water heater, which is characterized by comprising the following steps: the method comprises the steps of starting a gas water heater, collecting current gas flow, air flow and heat load numerical values in real time, and adjusting a gas flow control assembly, an air flow control assembly or a fan flow control assembly to enable a variation parameter to be the same as a corresponding preset standard value when any one of the current gas flow, the air flow and the heat load numerical values is different from the corresponding preset standard value and the other two parameters are not changed. The invention also discloses a gas water heater comprising the control method. The invention effectively realizes the functions that the full premix combustion is not easy to generate the tempering phenomenon and the full premix combustion load is not reduced when the pressure of the pipe network fluctuates and the external wind pressure fluctuates.
Description
Technical Field
The invention belongs to the technical field of control of gas water heaters, and particularly relates to a control method of a fully premixed gas water heater and the gas water heater.
Background
In the existing gas water heating device, the device can be divided into a full premix burner type and a partial premix burner type according to the combustion mode of gas, particularly different mixing ratios of air and gas. Wherein, the full premix has the following characteristics:
the air and the fuel gas are fully mixed according to the chemical equivalent ratio before combustion, and then ignition combustion is carried out, so that the fuel gas burner has many advantages, such as full combustion of the fuel gas, high volumetric heat intensity, high heat efficiency, low harmful emission index and the like; however, when the pressure of the pipe network fluctuates and the external wind pressure fluctuates, the full premix combustion is easy to generate a backfire phenomenon, and the full premix combustion load may also be reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a control method of a fully premixed gas water heater.
The invention also aims to provide a gas water heater using the control method.
The technical scheme of the invention is realized as follows: a control method of a fully premixed gas water heater comprises the following steps:
the method comprises the steps of starting a gas water heater, collecting current gas flow, air flow and heat load numerical values in real time, and adjusting a gas flow control assembly, an air flow control assembly or a fan flow control assembly to enable a variation parameter to be the same as a corresponding preset standard value when any one of the current gas flow, the air flow and the heat load numerical values is different from the corresponding preset standard value and the other two parameters are not changed.
Preferably, the gas flow control assembly includes a gas proportional valve and a gas flowmeter, and when the current gas flow is different from the corresponding preset standard value and the air flow and heat load values are not changed, the gas flow control assembly is adjusted to make the changed parameter the same as the corresponding preset standard value, and the specific method includes:
when the current gas flow is different from the corresponding preset standard value and the air flow and the heat load value are unchanged, the gas flow is controlled by adjusting the gas proportional valve and the gas flowmeter until the gas flow is the same as the preset standard gas flow.
Preferably, the air flow control assembly includes an air proportional valve and an air flow meter, and when the current air flow is different from the corresponding preset standard value and the gas flow and the heat load value are not changed, the air flow control assembly is adjusted to make the change parameter the same as the corresponding preset standard value, and the specific method includes:
and when the current air flow is different from the corresponding preset standard value and the gas flow and the heat load value are unchanged, controlling the air flow until the air flow is the same as the preset standard gas flow by adjusting the air proportional valve and the gas flowmeter.
Preferably, the gas flow rate is adjusted or the air flow rate is adjusted, specifically, the opening degree of the gas proportional valve is adjusted or the opening degree of the air proportional valve is adjusted.
Preferably, the fan flow control assembly includes a direct current fan and an anemoscope, and when the current heat load value is different from the corresponding preset standard value and the gas flow and the air flow are not changed, the fan flow control assembly is adjusted to make the changed parameter the same as the corresponding preset standard value, and the specific method includes:
and when the current heat load value is different from the corresponding preset standard value and the gas flow and the air flow are unchanged, controlling the flow of the fan by adjusting the direct-current fan and the anemoscope until the heat load value is the same as the preset standard heat load value.
The other technical scheme of the invention is realized as follows: the utility model provides a gas heater of full premix, includes combustor, heat exchanger, gas control assembly, air control assembly, detects and control module, the input port of combustor passes through the pipeline and is connected with the hybrid tube way, the delivery outlet of combustor passes through the pipeline and is connected with heat exchanger, gas control assembly and air control assembly set up on the hybrid tube way, gas control assembly, air control assembly all with detect and control module are connected.
Preferably, the flow control device further comprises a fan flow control assembly and a driven impeller, wherein the fan flow control assembly comprises a direct current fan and an anemograph, the direct current fan and the driven impeller are arranged on a pipeline which is connected with the input port of the combustor and the mixing pipeline, the direct current fan is located between the combustor and the driven impeller, and the anemograph is arranged on a pipeline at the outlet of the heat exchanger.
Preferably, the mixing pipeline comprises a gas pipeline and an air pipeline, the gas control assembly is arranged on the gas pipeline, the air control assembly is arranged on the air pipeline, and the gas control assembly and the air control assembly are connected with the detection and control module.
Preferably, the gas control assembly includes gas proportional valve, gas flowmeter, gas proportional valve, gas flowmeter all set up on gas pipeline, the air control assembly includes air proportional valve, air flowmeter, air proportional valve, air flowmeter all set up at air pipeline.
Preferably, the water inlet end of the heat exchanger is provided with a water regulating valve, the water outlet end of the heat exchanger is provided with a water temperature sensor, and the water regulating valve and the water temperature sensor are both connected with the detection and control module.
Compared with the prior art, according to the invention, by adjusting the gas flow control assembly, the air flow control assembly or the fan flow control assembly to enable the variation parameter to be the same as the corresponding preset standard value when any one parameter of the current gas flow, the current air flow and the heat load value is different from the corresponding preset standard value and the other two parameters are not changed, the effects that the tempering phenomenon is not easy to occur in the full-premix combustion and the full-premix combustion load is not reduced when the pressure of a pipe network fluctuates and the external air pressure fluctuates are effectively realized.
Drawings
Fig. 1 is a flowchart of a control method of a fully premixed gas water heater according to embodiment 1 of the present invention;
fig. 2 is a simplified diagram of a fully premixed gas water heater according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The method for controlling a fully premixed gas water heater provided in embodiment 1 of the present invention is a method flowchart, as shown in fig. 1, and the method specifically includes:
the method comprises the steps of starting a gas water heater, collecting current gas flow, air flow and heat load numerical values in real time, and adjusting a gas flow control assembly, an air flow control assembly or a fan flow control assembly to enable a variation parameter to be the same as a corresponding preset standard value when any one of the current gas flow, the air flow and the heat load numerical values is different from the corresponding preset standard value and the other two parameters are not changed.
Further, the gas flow control assembly comprises a gas proportional valve and a gas flowmeter, when the current gas flow is different from the corresponding preset standard value and the air flow and the heat load value are unchanged, the gas flow control assembly is adjusted to enable the changed parameter to be the same as the corresponding preset standard value, and the specific method comprises the following steps:
when the current gas flow is different from the corresponding preset standard value and the air flow and the heat load value are unchanged, the gas flow is controlled by adjusting the gas proportional valve and the gas flowmeter until the gas flow is the same as the preset standard gas flow.
Further, the air flow control assembly comprises an air proportional valve and an air flow meter, when the current air flow is different from a corresponding preset standard value and the gas flow and the heat load value are unchanged, the air flow control assembly is adjusted to enable the changed parameter to be the same as the corresponding preset standard value, and the specific method comprises the following steps:
and when the current air flow is different from the corresponding preset standard value and the gas flow and the heat load value are unchanged, controlling the air flow until the air flow is the same as the preset standard gas flow by adjusting the air proportional valve and the gas flowmeter.
Further, the gas flow rate is adjusted or the air flow rate is adjusted, specifically, the opening degree of the gas proportional valve is adjusted or the opening degree of the air proportional valve is adjusted.
Further, the fan flow control assembly comprises a direct current fan and an anemoscope, when the current heat load value is different from the corresponding preset standard value and the gas flow and the air flow are not changed, the fan flow control assembly is adjusted to enable the change parameter to be the same as the corresponding preset standard value, and the specific method comprises the following steps:
and when the current heat load value is different from the corresponding preset standard value and the gas flow and the air flow are unchanged, controlling the flow of the fan by adjusting the direct-current fan and the anemoscope until the heat load value is the same as the preset standard heat load value.
The working principle of the control method of the fully premixed gas water heater provided by the embodiment 1 of the invention is as follows:
according to the characteristics of full-premix combustion, air and gas are fully mixed according to a chemical equivalent ratio before combustion, then ignition combustion is carried out, and the combustion is relatively full.
When the pressure of a gas source changes or the load needs to be adjusted, the gas flow changes and backfire easily occurs, so that the gas flow needs to be accurately controlled and is realized by adopting a PID control method through a gas flowmeter and a gas proportional valve; in order to more accurately control the mixing ratio of gas and air, an air flow meter and an air proportional valve are required to control the air flow.
After being fully mixed by a driven impeller, the fuel gas and the air enter a combustor through pressurization of a direct current fan; the direct current fan is used for pressurizing a mixture of fuel gas and air; the flow rate of the fan is determined by the heat load (which can be converted into the gas flow rate) and the excess oxygen alpha (which can be 5-10%); after the gas combustion passes through the heat exchanger, the gas is discharged outwards through the anemometer.
When the back pressure changes, the air volume of the direct current fan also changes, and at the moment, the heat load of the water heating device also changes, so that the outlet water temperature fluctuates, and the experience feeling is poor; therefore, the flow of the flue gas outlet needs to be measured and monitored by an anemometer, so that the direct current motor is accurately controlled (realized by adopting a PID control method), and further, the proportion of gas and air is accurately controlled.
The control method comprises the following operation steps:
step S1: preparation of
Firstly, based on natural gas, configuring an air-fuel ratio according to a combustion reaction formula (the following formula), wherein the content alpha of excess oxygen is 5-10%:
CH4+2O2＝CO2+2H2O+ΔH
secondly, measuring a curve of the rotating speed of the fan to the air quantity in advance, adjusting the air quantity of the motor, and storing the curve to a storage of the hot water device;
thirdly, assuming that the thermal load interval of the gas water heater is [ QL, QH ], the regulating interval corresponding to the direct current fan is [ PL1, PH1 ]; the adjusting range of the gas proportional valve is [ PL2, PH2 ]; the air proportional valve regulation interval is [ PL3, PH3 ].
Setting an initial value: taking an initial value Q0∈[QL，QH]At this time, P1 is corresponded0∈[PL1，PH1]，P20∈[PL2，PH2]，P30∈[PL3，PH3]
Step S2: initialization
Electrifying the gas water heater, electrifying the gas water heater for self-detection, and detecting whether each part of components normally work or not through a controller;
and secondly, loading the data prepared in the first step, and initializing the set data to hardware.
(iii) passing Q0Calculating the gas flow, and accurately controlling the gas flow through a gas proportional valve, wherein the gas flow is q10；
Fourthly, q10Calculated according to the chemical reaction formula and the excess oxygen content alphaAnd the air flow rate is accurately controlled by an air regulating valve, wherein the air flow rate is q20
From q10、q20Determining a fan flow and a fan adjustment value P10；
Sixthly, q10、q20And determining the total smoke amount by chemical reaction, thereby determining the flow velocity v of the smoke outlet0
Controlling the flow of the fan through the direct current fan and the anemometer to adapt to the external pressure, thereby accurately controlling the heat load of the water heater until the system runs stably.
Step S3: detecting, collecting data and operating
Collecting data (mainly comprising heat load, gas flow, gas proportional valve opening, air proportional valve opening, fan control parameters, smoke exhaust air speed and the like), and collecting Q, P1, P2, q1 and v;
② when other parameters are unchanged and q1 is changed (caused by pipe network pressure change, etc.)
If q1 becomes larger, the pressure of the pipe network becomes larger, and then the gas proportional valve is reduced;
if q1 becomes smaller, the pressure of the pipe network is reduced, and then the gas proportional valve is increased;
if q1 is not changed, go to (iv);
③ when other parameters are not changed, v is changed (caused by back pressure change)
If v is increased, the back pressure is decreased, and the flow of the fan is decreased (namely the motor is increased);
if v becomes smaller, the back pressure is increased, and the flow of the fan is increased (namely the motor is decreased);
if v is not changed, entering into (iv);
and fourthly, when other parameters are not changed, the load is changed (set and adjusted by a user).
Calculating the gas flow Q1' through Q, and accurately controlling the gas flow through a gas proportional valve;
calculating the air flow required by the full premix combustion according to a chemical reaction formula and the excess oxygen alpha through q1 ', and accurately controlling the air flow through an air regulating valve, wherein the air flow is q 2';
determining the flow rate and a regulating value P1 ' of the direct current fan through q1 ' and q2 ';
the flow of the direct current fan is controlled through the direct current fan regulating value P1' and the excess oxygen alpha, and further the proportion of the fuel gas and the air is accurately controlled and controlled;
until combustion is smooth.
After adopting above-mentioned scheme, through current gas flow, air flow and heat load numerical value to under the gas water heater operating condition, work as arbitrary parameter is different rather than the predetermined standard value that corresponds in current gas flow, air flow and the heat load numerical value, and when two other parameters were unchangeable, through adjusting gas flow control subassembly, air flow control subassembly or fan flow control subassembly and make this change parameter the same with the predetermined standard value that corresponds, when the effectual pipe network pressure fluctuation and outside wind pressure fluctuation of having realized, the difficult tempering phenomenon that takes place of full premix burning and can not reduce the effect of full premix burning load.
Example 2
An embodiment 2 of the present invention provides a gas water heater, as shown in fig. 2, including a burner 1, a heat exchanger 2, a gas control assembly 3, an air control assembly 4, and a detection and control module 5, wherein an input port of the burner 1 is connected to a mixing pipe 6 through a pipe, an output port of the burner 1 is connected to the heat exchanger 2 through a pipe, the gas control assembly 3 and the air control assembly 4 are disposed on the mixing pipe 6, and both the gas control assembly 3 and the air control assembly 4 are connected to the detection and control module 5.
Further, the device also comprises a fan flow control assembly 7 and a driven impeller 8, wherein the fan flow control assembly 7 comprises a direct current fan 71 and an anemometer 72, the direct current fan 71 and the driven impeller 8 are arranged on a pipeline connecting an input port of the combustor and the mixing pipeline 6, the direct current fan 71 is positioned between the combustor 1 and the driven impeller 8, and the anemometer 72 is arranged on a pipeline at an outlet of the heat exchanger 2.
Further, mixing duct 6 includes gas pipeline 61 and air duct 62, and gas control assembly 3 sets up on gas pipeline 61, and air control assembly 4 sets up at air duct 62, and gas control assembly 3, air control assembly 4 all are connected with detection and control module 5.
Further, the gas control assembly 3 comprises a gas proportional valve 31 and a gas flow meter 32, the gas proportional valve 31 and the gas flow meter 32 are both arranged on the gas pipeline 61, the air control assembly 4 comprises an air proportional valve 41 and an air flow meter 42, and the air proportional valve 41 and the air flow meter 42 are both arranged on the air pipeline 62.
Furthermore, the water inlet end of the heat exchanger 2 is provided with a water regulating valve 9, the water outlet end is provided with a water temperature sensor, and the water regulating valve 9 and the water temperature sensor are both connected with the detection and control module 5.
By using the gas water heater of the control method, the effects that when the pressure of a pipe network fluctuates and the external wind pressure fluctuates, the full premix combustion is not easy to generate the tempering phenomenon and the full premix combustion load cannot be reduced are effectively realized.
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:
the method comprises the steps of starting a gas water heater, collecting current gas flow, air flow and heat load numerical values in real time, and adjusting a gas flow control assembly, an air flow control assembly or a fan flow control assembly to enable a variation parameter to be the same as a corresponding preset standard value when any one of the current gas flow, the air flow and the heat load numerical values is different from the corresponding preset standard value and the other two parameters are not changed.
2. The control method of a fully premixed gas water heater according to claim 1, wherein the gas flow control assembly comprises a gas proportional valve and a gas flow meter, and when the current gas flow is different from the corresponding preset standard value and the air flow and heat load values are not changed, the gas flow control assembly is adjusted to make the changed parameter be the same as the corresponding preset standard value, and the specific method is as follows:
when the current gas flow is different from the corresponding preset standard value and the air flow and the heat load value are unchanged, the gas flow is controlled by adjusting the gas proportional valve and the gas flowmeter until the gas flow is the same as the preset standard gas flow.
3. The control method of a fully premixed gas water heater according to claim 2, wherein the air flow control assembly comprises an air proportional valve and an air flow meter, and when the current air flow is different from the corresponding preset standard value and the gas flow and the heat load value are not changed, the air flow control assembly is adjusted to enable the change parameter to be the same as the corresponding preset standard value, and the specific method is as follows:
and when the current air flow is different from the corresponding preset standard value and the gas flow and the heat load value are unchanged, controlling the air flow until the air flow is the same as the preset standard gas flow by adjusting the air proportional valve and the gas flowmeter.
4. A control method for a fully premixed gas water heater according to any one of claims 1 to 3, characterized in that the gas flow rate is adjusted or the air flow rate is adjusted, in particular, the opening of the gas proportional valve is adjusted or the opening of the air proportional valve is adjusted.
5. The method according to claim 4, wherein the fan flow control assembly comprises a direct current fan and an anemometer, and when the current thermal load value is different from the corresponding preset standard value and the gas flow and the air flow are not changed, the fan flow control assembly is adjusted to enable the change parameter to be the same as the corresponding preset standard value, and the specific method comprises the following steps:
and when the current heat load value is different from the corresponding preset standard value and the gas flow and the air flow are unchanged, controlling the flow of the fan by adjusting the direct-current fan and the anemoscope until the heat load value is the same as the preset standard heat load value.
6. The utility model provides a gas heater of full premix, its characterized in that, includes combustor (1), heat exchanger (2), gas control assembly (3), air control assembly (4), detects and control module (5), the input port of combustor (1) passes through the pipeline and is connected with hybrid tube (6), the delivery outlet of combustor (1) passes through the pipeline and is connected with heat exchanger (2), gas control assembly (3) and air control assembly (4) set up on hybrid tube (6), gas control assembly (3), air control assembly (4) all with detect and control module (5) are connected.
7. The gas water heater with the self-adaptive gas source fully premixed combustion as claimed in claim 6, further comprising a fan flow control assembly (7) and a passive impeller (8), wherein the fan flow control assembly (7) comprises a direct current fan (71) and an anemometer (72), the direct current fan (71) and the passive impeller (8) are arranged on a pipeline connecting the input port of the combustor and the mixing pipeline (6), the direct current fan (71) is located between the combustor (1) and the passive impeller (8), and the anemometer (72) is arranged on a pipeline at the outlet of the heat exchanger (2).
8. The gas water heater with the self-adaptive gas source and the fully premixed combustion as claimed in claim 7, wherein the mixing pipe (6) comprises a gas pipe (61) and an air pipe (62), the gas control assembly (3) is arranged on the gas pipe (61), the air control assembly (4) is arranged on the air pipe (62), and the gas control assembly (3) and the air control assembly (4) are both connected with the detection and control module (5).
9. The gas water heater with the self-adaptive gas source and the fully premixed combustion as claimed in claim 8, wherein the gas control assembly (3) comprises a gas proportional valve (31) and a gas flow meter (32), the gas proportional valve (31) and the gas flow meter (32) are both arranged on a gas pipeline (61), the air control assembly (4) comprises an air proportional valve (41) and an air flow meter (42), and the air proportional valve (41) and the air flow meter (42) are both arranged on an air pipeline (62).
10. The gas water heater with the self-adaptive gas source and the fully premixed combustion as claimed in any one of claims 6 to 9, wherein a water regulating valve (9) is arranged at a water inlet end of the heat exchanger (2), a water temperature sensor is arranged at a water outlet end of the heat exchanger, and the water regulating valve (9) and the water temperature sensor are both connected with the detection and control module (5).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154688A (en) * | 2021-04-21 | 2021-07-23 | 瑞美(中国)热水器有限公司 | Control method of full-premixing condensing type gas positive displacement water heater and water heater |
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| CN106642711A (en) * | 2015-09-22 | 2017-05-10 | 艾欧史密斯(中国)热水器有限公司 | Dual-sensing combustion system |
| CN206420136U (en) * | 2017-01-04 | 2017-08-18 | 广东昊森热能设备有限公司 | A kind of fully pre-mixing gas combustion water heater for heating |
| CN109442405A (en) * | 2018-12-26 | 2019-03-08 | 广州威茨热能技术有限公司 | A kind of air-fuel ratio mixer |
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| CN113154688A (en) * | 2021-04-21 | 2021-07-23 | 瑞美(中国)热水器有限公司 | Control method of full-premixing condensing type gas positive displacement water heater and water heater |
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