CN1584437A - Positive displacement rapid water heater and controlling method thereof - Google Patents
Positive displacement rapid water heater and controlling method thereof Download PDFInfo
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- CN1584437A CN1584437A CN 200410024980 CN200410024980A CN1584437A CN 1584437 A CN1584437 A CN 1584437A CN 200410024980 CN200410024980 CN 200410024980 CN 200410024980 A CN200410024980 A CN 200410024980A CN 1584437 A CN1584437 A CN 1584437A
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Abstract
A volume style water heater can be used in apartments, offices, hotels and villas. It consists of a sealed water tank, an expanding tank, a flue, a quick heater, a combusting chamber, a blower, a water pump, a safety valve for controlling combustion, a check valve, a controller, a shell, pipelines for cold and hot water, and gas fuel pipelines. A microcomputer as intellectual controller is used to inspect, to determine, to diagnose, and to control circulation. It combines advantages of direct flow style and volume style water heaters together, provides hot water at once as starting with large flow and efficient combustion, saves energy, and works reliably and safely. A method for controlling is disclosed also.
Description
Technical field
The present invention relates to a kind of gas and hot water apparatus, belong to combustion gas electric type product, belong to household appliances, heat supply and shower equipment technical field, refer to a kind of volumetric gas fast water heater and control method thereof that is used for household appliances heating, heat supply and the shower set in places such as family's big-room and luxury housing project, type room, many toilets, office, hospital, student dormitory, small-sized hotel, villa and cosmetology especially.
Background technology
On the water heater market two kinds of common water heaters are arranged at present, be divided into two kinds of single flow fast water heater and displacement type water heaters.
The single flow fast water heater is that the cold water coiled pipe that has fin of flowing through is heated by hot flue gas, obtains the water heater of required leaving water temperature.The single flow fast water heater can provide hot water fast continuously, and the thermal efficiency is also high, and temperature lag when still starting can be wasted some water sources, and simultaneous temperature and flow can rise and fall with the pressure variation that makes water consumption and water.
Displacement type water heater is to store more water, intermittently water is heated to needed temperature, and its burning is to adopt the air suspended type burner.Advantage: shorter than nature air inducing diffusion burner flame, firepower is strong, the ignition temperature height, and the combustion gas of different nature of can burning, it is safer to burn.Shortcoming: since a premix part air, rather than all burnings, the discharge capacity of CO is higher, also has potential safety hazard.
The water tank of displacement type water heater is divided into open and closed two kinds, and the former under atmospheric pressure heats water, and its heat loss is bigger, but the easy-clear incrustation scale, the latter can bear certain steam pressure, and heat loss is less, but removes the incrustation scale difficulty.
Summary of the invention
In order to overcome above-mentioned weak point, main purpose of the present invention is at the deficiencies in the prior art and actual needs, aims to provide a kind of volumetric gas fast water heater and control method thereof that integrates the advantage of two kinds of forms and merged new concept again.
The technical problem to be solved in the present invention is: solve the problem of moisture storage capacity, can guarantee a large amount of water supply; Solve the technical problems such as control procedure that firing rate is slow, improve power and water heater.
The technical solution adopted for the present invention to solve the technical problems is: this device is made up of single flow fast water heater and the displacement type water heater except that combustion system, mainly comprises: parts such as closed water tank, expansion tank, flue tube, fast water heater, combustion chamber, blower fan, water pump, adjustable metastable gas pressure-controlled valve, check-valves, controller, casing, hot water pipe, gas pipeline.This device comprises: water circuit system; Combustion system; Flue gas removal system and control system four major parts; Wherein the casing internal upper part is equipped with the water heater link plate, on the water heater link plate fast water heater is installed, the bottom of fast water heater is equipped with controller and control panel, have bracing frame at controller and control panel, in fast water heater, be provided with the combustion chamber, the top of fast water heater links by smoke pipe interface and flue tube, bottom and blower fan link, the one side is equipped with coil pipe, and link by hot water pipe and water tank, opposite side links by water pipe and water pump, and expansion tank links with water pump and water tank successively by water pipe, adjustable metastable gas pressure-controlled valve is connected on the gas pipeline, and check-valves is installed in the bottom of water tank.
The water circuit system of described volumetric gas fast water heater comprises:
Keep the water circulation system of steady temperature thermal source to form by parts such as closed water tank, expansion tank, water pump and fast water heaters;
Its operation principle: the water that certain altitude is housed in the water tank in advance, open water pump, the cold water of water tank bottom enters fast water heater or heat exchanger by water pump, draw heat, cold water becomes hot water and enters the water tank topmost surface again, move in circles like this, the water in water tank reaches design temperature.As long as the switching with design temperature control hot water circuit has just obtained a bigger constant temperature source.
Provide the water system of thermal source to form by parts such as closed water tank, check-valves, water pipe and outlet valves.
The combustion system of described volumetric gas fast water heater is made up of parts such as adjustable metastable gas pressure-controlled valve, winter, summer valve gear, combustion chamber, igniter and even space segmentation formula burners, and the burnt gas valve of wherein adjustable metastable gas pressure-controlled valve is provided with the double insurance device;
This device has been introduced the water pump circulatory system in the heating water route, has accomplished real constant current by the water of fast water heater in other words, has so just simplified the fuel gas buring requirement, can better control combustion gas and air pre-mixing ratio.
The flue gas removal system of described volumetric gas fast water heater is made up of parts such as blower fan, flue tubes, and wherein blower fan is positioned at the burner below; Adopt technique for blast down, airtight combustion chamber is fully utilized combustion gas heat energy, reaches abundant burning.
The control system of described volumetric gas fast water heater is made up of the parts such as protected by temperature limitation device of the upper and lower cooling-water temperature sensor in the flow sensor on microcomputer-recognized intelligent controller, the outlet valve, the water tank, water tank middle water level height sensor, smoke evacuation detection of negative pressure switch and heat-exchange system.
The top of the fast water heater of described volumetric gas fast water heater is provided with the exhaust fume collecting hood assembly, and the bottom is equipped with combustion-chamber assembly, and the centre is equipped with tube coil type heat exchanger, and temperature limit switch is installed in tube coil type heat exchanger outer upper position.
The blower fan of described volumetric gas fast water heater links with screw, fan interface and fan interface sealing gasket successively.
The inner bag of the water tank of described volumetric gas fast water heater is made up of the gold silicon material.
A kind of control method of volumetric gas fast water heater, the groundwork method of this control system comprises: processes such as the self check of microcomputer-recognized intelligent controller, detection, judgement and circular treatment, its concrete job step is:
A), the first use:
Open the bleeder port at water tank top, deaeration is opened the water tank water intaking valve, makes water level reach predetermined altitude;
B), connect power supply and self check, detection, judgement:
After connecting power supply, the system CPU self check, the detection system state be normal after, entering working method judges, promptly be judged as and enter normal mode of operation, detect the water tank middle water level, judge the poor of water layer temperature and design temperature by upper and lower water layer temperature sensor in the water tank simultaneously by the height of water level sensor in the water tank, last water layer is poor with following water layer temperature, comprehensive again its result;
C), start water pump and detection:
After starting water pump, then the residual gas in the high-speed starting blower fan cleaning burner is removed the blast factor, continues to detect negative pressure switch after the several seconds;
D), inspection is overheated:
It is overheated to reexamine, and magnetic valve, flame ion circuit determine that above detection is all no problem, the blower fan low cruise;
E), high-voltage pulse igniting and detection:
The safety type gas control valve is opened in then high-voltage pulse igniting then, after the several seconds, and the success of whether lighting a fire of flame ion electric circuit inspection;
F), pulse firing stops:
Then pulse firing stops, and burner burns according to " winter ", " summer " different conditions;
G), the processing that moves in circles:
The water of water tank is owing to water pump operation, and cold water is constantly extracted out from the water storing tank bottom, and hot water constantly flows to the water tank upper strata from heat exchanger, and the processing that moves in circles, and water temperature reaches design temperature in water tank;
H), close water heater:
Water temperature reaches design temperature in water tank, so upper and lower cooling-water temperature sensor sends signal, closes water heater; Temperature is lower than design temperature in water tank, repeats the beginning process again;
I), the indication of reporting to the police, complete machine cuts out:
In whole control process, need only and occur: line under-voltage, fan trouble, the negative pressure switch fault, overheated burning, accident extinguishing etc., the indication of reporting to the police will appear respectively in system, and complete machine cuts out.
Heat supply water process of the present invention is: cut off or stop pump working, cold water directly enters from the fast water heater import, thermostatted water comes out, when CPU detects temperature in the water tank and drops to design temperature, the control burning of repetitive cycling control procedure is carried out, and is equivalent at the contacted hot water of your design temperature of a drum of fast water heater delivery port.
The invention has the beneficial effects as follows: this association system integrates the advantage of single flow fast water heater and two kinds of forms of displacement type water heater, and control by intelligent microcomputer, only need open the water heater tap, constant-temperature constant-current calorimetric water promptly flows out continuously, has instant-heating, constant temperature, big flow, few startup, efficiency of combustion height, energy-conservation, green safety, characteristics such as reliable, efficient.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Accompanying drawing 1 is a general structure schematic diagram of the present invention;
Accompanying drawing 2 is partial sectional views of fast water heater of the present invention;
Accompanying drawing 3 is fast water heater front views of the present invention;
Accompanying drawing 4 is blower fan front views of the present invention;
Accompanying drawing 5 is water tank front views of the present invention;
Label declaration in the accompanying drawing:
1-water tank, 20-water heater link plate;
101-control panel 4-1-exhaust fume collecting hood assembly;
2-expansion tank; 4-2-temperature limit switch;
3-flue tube; 4-3-tube coil type heat exchanger;
4-fast water heater; 4-5-combustion-chamber assembly;
5-combustion chamber; 50-smoke pipe interface;
6-water pump; 60-coil pipe;
7-blower fan; 7-2-screw;
8-adjustable metastable gas pressure-controlled valve; 7-3-fan interface;
9-controller 7-4-fan interface sealing gasket;
10-casing; 80-bracing frame;
11-hot water pipe;
12-gas pipeline;
13-check-valves;
The specific embodiment
See also shown in the accompanying drawing 1,2,3,5, the present invention is made up of single flow fast water heater and the displacement type water heater except that combustion system, mainly comprises: closed water tank (1), expansion tank (2), flue tube (3), fast water heater (4), combustion chamber (5), blower fan (7), water pump (6), safety type burner control valve (8), check-valves (13), controller (9), casing (10), hot water pipe (11), gas pipeline parts such as (12) are formed.This device comprises: water circuit system; Combustion system; Flue gas removal system and control system four major parts; Wherein casing (10) internal upper part is equipped with water heater link plate (20), fast water heater (4) is installed on the water heater link plate (20), the bottom of fast water heater (4) is equipped with controller (9) and control panel (101), have bracing frame (80) at controller (9) and control panel (101), in fast water heater (4), be provided with combustion chamber (5), the top of fast water heater (4) links by smoke pipe interface (50) and flue tube (3), bottom and blower fan (7) link, the one side is equipped with coil pipe (60), and link by hot water pipe (11) and water tank (1), opposite side links by water pipe and water pump (6), expansion tank (2) links with water pump (6) and water tank (1) successively by water pipe, adjustable metastable gas pressure-controlled valve (8) is connected on the gas pipeline (12), and check-valves (13) is installed in the bottom of water tank (1).
Shell of the present invention is elegant in appearance, and the complete machine device is settled compact, below water tank (1) is contained in, reduced machine gravity, kept the stable of complete machine, flue tube (3) is contained in the top, fast water heater (4) top loading, the one side is equipped with expansion tank (2), in the middle of other devices are installed in.
The water circuit system of described volumetric gas fast water heater comprises:
Keep the water circulation system of steady temperature thermal source to form by closed water tank (1), expansion tank (2), water pump (6) and fast water heater (4);
Its operation principle: the water that certain altitude is housed in the water tank (1) in advance, open water pump (6), the cold water of water tank (1) bottom enters fast water heater (4) or heat exchanger by water pump (6), draw heat, cold water becomes hot water and enters water tank (1) topmost surface again, move in circles like this, the water in water tank (1) reaches design temperature.As long as the switching with design temperature control hot water circuit has just obtained a bigger constant temperature source.Water temperature in water tank (1) raises, volumetric expansion, and the water that has more will flow to expansion tank (2).Water when temperature reduces in the expansion tank (2) can flow water tank (1) again.Expansion tank (2) is a safety device just.
Provide the water system of thermal source to form by parts such as closed water tank (1), check-valves (13), water pipe and outlet valves.Water outlet control method is the back standard, promptly with the hot water valve water management that is contained in the hot water exit.Open state because cold water pipe is in length, the water in the whole water tank (1) is in pressure state, so hot water valve one is opened, flow sensor just obtains signal, cuts off or stops water pump (6) and work, and thermostatted water just comes out.Be equivalent to fast water heater (4) delivery port connect a drum you set the hot water of temperature.
The combustion system of described volumetric gas fast water heater is made up of adjustable metastable gas pressure-controlled valve (8), winter, summer valve gear, combustion chamber (5), igniter and even space segmentation formula burner, and the burnt gas valve of wherein adjustable metastable gas pressure-controlled valve (8) is provided with the double insurance device; In order to reach bigger safety coefficient, adopted burnt gas valve double insurance device, even one of them has fault also can guarantee safe handling.Adopted distinguished " winter ", " summer " combustion system, the employing that matches the even mode of heating that burns at interval of burner, this has prolonged the service life of machine relatively, simultaneously also at double increasing the adjustable range of serviceability temperature.Popularly say that low temperature is transferred down, has saved the energy on high temperature (the highest 70 ℃) energy.
Because the water pump circulatory system has been introduced in the heating water route, accomplished real constant current by the water of fast water heater (4) in other words, so just simplified the fuel gas buring requirement, can better control combustion gas and air pre-mixing ratio, thereby making burning reach maximal efficiency, CO and harmful poison gas discharge capacity also drop to the end simultaneously.
The flue gas removal system of described volumetric gas fast water heater is made up of blower fan (7), flue tube (3), wherein blower fan (7) is positioned at the burner below, adopt technique for blast down, airtight combustion chamber is fully utilized combustion gas heat energy, reach abundant burning, reduced CO and emission of harmful substances.
The control system of described volumetric gas fast water heater is made up of the protected by temperature limitation device of the upper and lower cooling-water temperature sensor in the flow sensor on microcomputer-recognized intelligent controller (9), the outlet valve, the water tank (1), water tank (1) middle water level height sensor, smoke evacuation detection of negative pressure switch and heat-exchange system.
See also shown in the accompanying drawing 3, the top of the fast water heater of described volumetric gas fast water heater (4) is provided with exhaust fume collecting hood assembly (4-1), the bottom is equipped with combustion-chamber assembly (4-5), the centre is equipped with tube coil type heat exchanger (4-3), and temperature limit switch (4-2) is installed in tube coil type heat exchanger (4-3) outer upper position.
See also shown in the accompanying drawing 4, the blower fan of described volumetric gas fast water heater (7) meets (7-3) with screw (7-2), blower fan successively and fan interface sealing gasket (7-4) links.
See also shown in the accompanying drawing 5, the inner bag of the water tank of described volumetric gas fast water heater (1) is made up of the gold silicon material, has anticorrosive property, the antiscale function.
The control method of a kind of volumetric gas fast water heater of the present invention, the groundwork method of this control system comprises: the processes such as self check, detection, judgement and circular treatment of microcomputer-recognized intelligent controller (9), its concrete job step is:
A), the first use:
Open the bleeder port at water tank (1) top, deaeration is opened water tank (1) water intaking valve, makes water level reach predetermined altitude;
B), connect power supply and self check, detection, judgement:
After connecting power supply, the system CPU self check, the detection system state be normal after, entering working method judges, promptly be judged as and enter normal mode of operation, detect water tank (1) middle water level, judge the poor of water layer temperature and design temperature by upper and lower water layer temperature sensor in the water tank (1) simultaneously by the height of water level sensor in the water tank (1), last water layer is poor with following water layer temperature, comprehensive again its result;
C), start water pump and detection:
After starting water pump, then the residual gas in the high-speed starting blower fan cleaning burner is removed the blast factor, continues to detect negative pressure switch after the several seconds;
D), inspection is overheated:
It is overheated to reexamine, and magnetic valve, flame ion circuit determine that above detection is all no problem, the blower fan low cruise;
E), high-voltage pulse igniting and detection:
Safety type gas control valve (8) is opened in then high-voltage pulse igniting then, after the several seconds, and the success of whether lighting a fire of flame ion electric circuit inspection;
F), pulse firing stops:
Then pulse firing stops, and burner can burn according to " winter ", " summer " different conditions;
G), the processing that moves in circles:
The water of water tank is owing to water pump operation, and cold water is constantly extracted out from water storing tank (1) bottom, and hot water constantly flows to water tank (1) upper strata from heat exchanger, and the processing that moves in circles, and water temperature reaches design temperature in water tank (1);
H), close water heater:
Water temperature reaches design temperature in water tank (1), so upper and lower cooling-water temperature sensor sends signal, closes water heater; Temperature is lower than design temperature in water tank (1), repeats the beginning process again;
I), the indication of reporting to the police, complete machine cuts out:
In whole control process, need only and occur: line under-voltage, fan trouble, the negative pressure switch fault, overheated burning, the indication of reporting to the police will appear respectively in situations such as accident extinguishing, system, and complete machine cuts out.
Heat supply water process of the present invention is: cut off or stop pump working, cold water directly enters from the fast water heater import, thermostatted water comes out, when CPU detects temperature in the water tank (1) and drops to design temperature, the control burning of repetitive cycling control procedure is carried out, and is equivalent at the contacted hot water of your design temperature of a drum of fast water heater delivery port.
Claims (9)
1, a kind of volumetric gas fast water heater, this device has single flow fast water heater and the displacement type water heater except that combustion system, it is characterized in that comprising:
Water circuit system; Combustion system; Flue gas removal system and control system four major parts; Wherein casing (10) internal upper part is equipped with water heater link plate (20), fast water heater (4) is installed on the water heater link plate (20), the bottom of fast water heater (4) is equipped with controller (9) and control panel (101), have bracing frame (80) at controller (9) and control panel (101), in fast water heater (4), be provided with combustion chamber (5), the top of fast water heater (4) links by smoke pipe interface (50) and flue tube (3), bottom and blower fan (7) link, the one side is equipped with coil pipe (60), and link by hot water pipe (11) and water tank (1), opposite side links by water pipe and water pump (6), expansion tank (2) links with water pump (6) and water tank (1) successively by water pipe, adjustable metastable gas pressure-controlled valve (8) is connected on the gas pipeline (12), and check-valves (13) is installed in the bottom of water tank (1).
2, volumetric gas fast water heater according to claim 1, it is characterized in that: described water circuit system comprises:
Keep the water circulation system of steady temperature thermal source to form by closed water tank (1), expansion tank (2), water pump (6) and fast water heater (4);
Provide the water system of thermal source to form by closed water tank (1), check-valves (13), water pipe and outlet valve.
3, volumetric gas fast water heater according to claim 1, it is characterized in that: described combustion system is made up of adjustable metastable gas pressure-controlled valve (8), winter, summer valve gear, combustion chamber (5), igniter and even space segmentation formula burner, and the burnt gas valve of wherein adjustable metastable gas pressure-controlled valve (8) is provided with the double insurance device.
4, volumetric gas fast water heater according to claim 1 is characterized in that: described flue gas removal system is made up of blower fan (7), flue tube (3), and wherein blower fan (7) is positioned at the burner below.
5, volumetric gas fast water heater according to claim 1 is characterized in that: the circulation warm of described control system is made up of the protected by temperature limitation device of the upper and lower cooling-water temperature sensor in the flow sensor on microcomputer-recognized intelligent controller (9), the outlet valve, the water tank (1), water tank (1) middle water level height sensor, smoke evacuation detection of negative pressure switch and heat-exchange system.
6, volumetric gas fast water heater according to claim 1, it is characterized in that: the top of described fast water heater (4) is provided with exhaust fume collecting hood assembly (4-1), the bottom is equipped with combustion-chamber assembly (4-5), the centre is equipped with tube coil type heat exchanger (4-3), and temperature limit switch (4-2) is installed in tube coil type heat exchanger (4-3) outer upper position.
7, according to claim 1,4 described volumetric gas fast water heaters, it is characterized in that: described blower fan (7) links with screw (7-2), fan interface (7-3) and fan interface sealing gasket (7-4) successively.
8, volumetric gas fast water heater according to claim 1 is characterized in that: the inner bag of described water tank (1) is made up of the gold silicon material.
9, a kind of control method of volumetric gas fast water heater is characterized in that: the groundwork method of this control system comprises: self check, detection, judgement and the circulating treatment procedure of microcomputer-recognized intelligent controller (9), and its concrete job step is:
A), the first use:
Open the bleeder port at water tank (1) top, deaeration is opened water tank (1) water intaking valve, makes water level reach predetermined altitude;
B), connect power supply and self check, detection, judgement:
After connecting power supply, the system CPU self check, the detection system state be normal after, entering working method judges, promptly be judged as and enter normal mode of operation, detect water tank (1) middle water level, judge the poor of water layer temperature and design temperature by upper and lower water layer temperature sensor in the water tank (1) simultaneously by the height of water level sensor in the water tank (1), last water layer is poor with following water layer temperature, again synthesis result;
C), start water pump and detection:
After starting water pump, then the residual gas in the high-speed starting blower fan cleaning burner is removed the blast factor, continues to detect negative pressure switch after the several seconds;
D), inspection is overheated:
It is overheated to reexamine, and magnetic valve, flame ion circuit determine that above detection is all no problem, the blower fan low cruise;
E), high-voltage pulse igniting and detection:
Safety type gas control valve (8) is opened in then high-voltage pulse igniting then, after the several seconds, and the success of whether lighting a fire of flame ion electric circuit inspection;
F), pulse firing stops:
Then pulse firing stops, and burner is divided into " winter ", " summer " different conditions burns;
G), the processing that moves in circles:
The water of water tank is owing to water pump operation, and cold water is constantly extracted out from water storing tank (1) bottom, and hot water constantly flows to water tank (1) upper strata from heat exchanger, and the processing that moves in circles, and water temperature reaches design temperature in water tank (1);
H), close water heater:
Water temperature reaches design temperature in water tank (1), so upper and lower cooling-water temperature sensor sends signal, closes water heater; Temperature is lower than design temperature in water tank (1), repeats the beginning process again;
I), the indication of reporting to the police, complete machine cuts out:
In whole control process, occur: line under-voltage, fan trouble, the negative pressure switch fault, overheated burning, accident extinguishing, system is for occurring the indication of reporting to the police respectively, and complete machine cuts out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100249805A CN100549552C (en) | 2004-06-08 | 2004-06-08 | Volumetric gas fast water heater and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100249805A CN100549552C (en) | 2004-06-08 | 2004-06-08 | Volumetric gas fast water heater and control method thereof |
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| Publication Number | Publication Date |
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| CN1584437A true CN1584437A (en) | 2005-02-23 |
| CN100549552C CN100549552C (en) | 2009-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100249805A Expired - Fee Related CN100549552C (en) | 2004-06-08 | 2004-06-08 | Volumetric gas fast water heater and control method thereof |
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| CN102183092A (en) * | 2011-03-07 | 2011-09-14 | 无锡和晶信息技术有限公司 | Method for controlling draught fan of cold vibration prevention gas water heater |
| CN102338458A (en) * | 2010-07-15 | 2012-02-01 | 刘运柳 | Electric water heater with heating water tank |
| CN101832633B (en) * | 2009-03-09 | 2013-01-23 | 岳书才 | Heating and bathing condensed gas water heater with double volume |
| US8366014B2 (en) | 2007-02-21 | 2013-02-05 | A. O. Smith Enterprises Ltd. | Tank-tankless water heater |
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| CN101688686B (en) * | 2007-02-21 | 2013-06-19 | 艾欧史密斯有限公司 | Tank-tankless water heater |
| CN101832633B (en) * | 2009-03-09 | 2013-01-23 | 岳书才 | Heating and bathing condensed gas water heater with double volume |
| US9568213B2 (en) | 2009-06-16 | 2017-02-14 | A. O. Smith Corporation | Storeage gas water heater |
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| CN104566929B (en) * | 2014-12-29 | 2017-10-10 | 广东万家乐燃气具有限公司 | A kind of gas heater and control method |
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| CN105509300A (en) * | 2016-01-27 | 2016-04-20 | 潘婵 | Constant-temperature safety water heater special for commercial dish washer |
| CN107461923B (en) * | 2016-06-02 | 2020-07-14 | 林内株式会社 | Heat source machine |
| CN106091098A (en) * | 2016-08-11 | 2016-11-09 | 齐凤臣 | Module integrated system heating stove |
| CN110546440A (en) * | 2018-03-19 | 2019-12-06 | 崔荣桓 | Water storage type boiler with heat proportional control function and backflow prevention function |
| CN110546440B (en) * | 2018-03-19 | 2021-11-26 | 崔荣桓 | Water storage type boiler with heat proportional control function and backflow prevention function |
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| CN100549552C (en) | 2009-10-14 |
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