CN216897838U - Full-premixing combustion wave type fire tube gas water heater - Google Patents
Full-premixing combustion wave type fire tube gas water heater Download PDFInfo
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- CN216897838U CN216897838U CN202220176146.1U CN202220176146U CN216897838U CN 216897838 U CN216897838 U CN 216897838U CN 202220176146 U CN202220176146 U CN 202220176146U CN 216897838 U CN216897838 U CN 216897838U
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000002955 isolation Methods 0.000 claims abstract description 29
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 16
- 239000000779 smoke Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 210000001503 Joints Anatomy 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 230000000149 penetrating Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 40
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 17
- 239000003546 flue gas Substances 0.000 abstract description 15
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000009834 vaporization Methods 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 229910002089 NOx Inorganic materials 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitrogen oxide Substances O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 238000005293 physical law Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000009781 Myrtillocactus geometrizans Nutrition 0.000 description 1
- 240000009125 Myrtillocactus geometrizans Species 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052813 nitrogen oxide Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a full-premixing combustion wave type fire tube gas water heater, which comprises a cylinder, a combustion chamber, a heat exchange mechanism and a combustion system, wherein the combustion chamber and the heat exchange mechanism are arranged in the cylinder; the combustion chamber is positioned above the heat exchange mechanism; and the cavities in the cylinder body, between the combustion chamber and the heat exchange mechanism are hot water cavities. The heat exchange mechanism comprises an upper top isolation tube plate, a lower bottom isolation tube plate and a heat exchange channel between the upper top isolation tube plate and the lower bottom isolation tube plate, and the heat exchange channel comprises a plurality of vertically arranged heat exchange tubes; meanwhile, the heat exchange capacity is improved, the condensation heat exchange technology is adopted, latent heat of vaporization in the flue gas is recovered, and meanwhile, the vertical structure and the unique wave form are adopted, so that the self-cleaning device has a self-cleaning function, the blockage of a gas circuit is prevented, the later maintenance is greatly reduced, and meanwhile, the welding quantity is reduced due to the large pipe diameter.
Description
Technical Field
The utility model belongs to the technical field of gas water heater structures, and particularly relates to a full-premixing combustion wave type fire tube gas water heater.
Background
The gas water heater is a device which adopts gas as energy and heats water by heat generated by gas combustion to ensure that the water temperature meets the requirements of life, heating, production process and the like.
An atmospheric burner is generally adopted in the existing volumetric gas water heater, partial premixed combustion is realized, a system divides combustion-supporting air provided by a fan into two parts, and one part directly enters the burner and is called primary air; another part enters the combustion chamber from a passage outside the burner, called secondary air. The primary air and the fuel gas entering the burner are uniformly mixed, and the mixture is called premixed gas. When the air in the premixed gas is not enough to support the complete combustion of the fuel, part of the fuel in the premixed gas is firstly combusted at the outlet of the combustor to form an inner flame, and the rest of the unburned fuel is mixed with secondary air to be combusted by virtue of a diffusion process to form an outer flame. If the secondary air is still not sufficient to support complete combustion of the gas in the combustion chamber, high emissions of pollutants such as CO may result. In a typical product design, in order to control the emission level of pollutants such as CO in such a partially premixed combustion system, an air amount far larger than the theoretical requirement must be provided, i.e. the air excess factor is far larger than 1, and the air excess factor is usually designed to be as high as 1.8 to 2.5 (i.e. 80 to 150% more than the air amount required by the theoretical requirement). However, the excess air raises the requirements for the fan, increases the combustion noise of the system, and reduces the heat exchange efficiency.
The form of current positive displacement gas heater heat exchanger is mostly the straight tube type, coil pipe etc, straight tube type heat exchanger generally adopts the mode of bottom burning, in order to prevent that the production of comdenstion water from causing the corruption of combustor, general exhaust gas temperature is higher, the problem that the ubiquitous thermal efficiency is low, coil pipe type heat exchanger's combustion chamber is less relatively, the required space of flue gas flow is also less, when increaseing the power of water heater, if increase burner's combustion power, the flue gas that the burning produced also increases along with it, it is difficult to flow very easily, and then lead to the insufficient even burning of burning to extinguish, make the water heater can't be by normal use.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a novel wave type heat exchange tube fully premixed combustion positive displacement water heater, and the technical scheme is as follows:
a full-premixing combustion wave type fire tube gas water heater comprises a cylinder body, a combustion chamber, a heat exchange mechanism and a combustion system, wherein the combustion chamber and the heat exchange mechanism are arranged in the cylinder body; the combustion chamber is positioned above the heat exchange mechanism;
the cavity between the interior of the cylinder body and the exterior of the combustion chamber and the heat exchange mechanism is a hot water cavity;
the top of the cylinder body is provided with a cover body, and the combustion system is fixed on the cover body.
Preferably, the bottom of the side wall of the cylinder body is provided with a water inlet, the cover body on the opposite side of the water inlet and the top of the side wall of the cylinder body is provided with a water outlet, and the water inlet is connected with a water supply pipe to provide cold water to be heated for the water heater; the water outlet hole is connected with the water outlet pipe and outputs hot water heated by the water heater.
Preferably, the bottom of the cylinder body is provided with a base, the side surface of the base is provided with a smoke exhaust channel, and a backpressure detection interface is arranged on the smoke exhaust channel and used for detecting the pressure of the discharged smoke.
Preferably, the side wall of the bottom of the cylinder body is also provided with a sewage discharge pipe and a maintenance hand hole; a temperature probe is arranged above the water inlet and used for detecting the water temperature in the cylinder body.
Preferably, the heat exchange mechanism comprises an upper top isolation tube plate, a lower bottom isolation tube plate and a heat exchange channel between the upper top isolation tube plate and the lower bottom isolation tube plate, the diameter of the bottom isolation tube plate is larger than that of the top isolation tube plate, and the edge of the bottom isolation tube plate is fixed above the base of the cylinder; the heat exchange channel comprises a plurality of heat exchange tubes, the top and the bottom of the heat exchange channel are connected with the top isolation tube plate and the bottom isolation tube plate in a penetrating and welding mode, and the heat exchange tubes are circumferentially distributed by taking the axis of the cylinder body as a central axis.
Preferably, the two ends of the heat exchange tube are cylindrical joints, the middle part of the heat exchange tube is flat, the width of the middle part of the heat exchange tube is larger than the outer diameter of the joint, and the thickness of the middle part of the heat exchange tube is smaller than the outer diameter of the joint. The middle portion has the same thickness and the opposite side walls are parallel to each other.
Preferably, the middle part of the heat exchange tube is wave-shaped, and can also be in a straight line shape, or the combination of the wave-shaped and the straight line shape.
Preferably, the combustion system comprises a fan for introducing air, a gas pipe for introducing gas, a premixing device for mixing air and gas, a burner and a heat insulation plate;
a gas valve is arranged on the gas pipe;
the heat insulation plate is fixedly arranged at the top of the cylinder body;
the fan and the gas pipe are respectively connected to the premixing device, the lower portion of the premixing device is connected to the burner, the fan, the gas pipe and the premixing device are arranged above the heat insulation plate, and the burner is arranged below the heat insulation plate and located inside the combustion chamber.
Preferably, the heat insulation plate is further provided with an ignition needle and a fire detection needle for detecting flame.
Preferably, the burner adopts a zero-pressure valve metal fiber burner.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model adopts a full premix combustion mode, thereby reducing the discharge amount of nitrogen oxides and carbon monoxide; meanwhile, the heat exchange capacity is improved, the condensation heat exchange technology is adopted, the latent heat of vaporization in the flue gas is recovered, and meanwhile, the vertical structure and the unique wave form are adopted, so that the vertical type heat exchanger has a self-cleaning function, the blockage of a gas path is prevented, the later maintenance is greatly reduced, and meanwhile, the welding amount is reduced due to the large pipe diameter;
2. the combustion chamber has large volume, enough area to absorb the radiant heat generated by the combustor, and enough space to uniformly distribute the generated high-temperature flue gas, thereby reducing the pressure fluctuation condition during ignition and improving the ignition success rate;
3. the flame propagation speed of the full premix combustion provided by the utility model is high, the volume heat intensity of the combustion chamber is very high, the full combustion can be achieved under a very small excess air coefficient, and the phenomenon of chemical incomplete combustion hardly exists; the surface combustor is adopted, and has the advantages of high combustion efficiency, less pollutant (CO, NOx and the like) emission of combustion products and the like;
4. the structure of the overhead burner is adopted, the physical law is met, and the condensate water generated by flue gas condensation falls downwards under the action of self gravity and the scouring action of the flue gas.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is an overall structure diagram of a fully premixed combustion wavy fire tube gas water heater provided by the utility model;
FIG. 2 is a structural diagram of a combustion system of the fully premixed combustion wavy fire tube gas water heater provided by the utility model;
fig. 3 is a structural view of a heat exchange tube of the fully premixed combustion wavy fire tube gas water heater provided by the utility model.
Wherein, 1-cylinder, 2-combustion chamber, 3-heat exchange mechanism, 4-combustion system, 5-hot water cavity;
11-a water inlet, 12-a water outlet, 13-a smoke exhaust channel, 14-a backpressure detection interface, 15-a sewage discharge pipe, 16-a maintenance hand hole and 17-a temperature probe;
31-top isolation tube plate, 32-bottom isolation tube plate, 33-heat exchange channel;
41-a fan, 42-a gas pipe, 43-a premixing device, 44-a burner, 45-an ignition needle, 46-a fire detection needle and 47-a heat insulation plate.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A full premix combustion wave type fire tube gas water heater is shown in figure 1 and comprises a cylinder body 1, a combustion chamber 2 arranged in the cylinder body, a heat exchange mechanism 3 and a combustion system 4 arranged at the upper part of the cylinder body 1;
a cavity between the inside of the cylinder 1 and the outside of the combustion chamber 2 and the heat exchange mechanism 3 is a hot water cavity 5;
the top of the cylinder body 1 is provided with a cover body, and the combustion system 4 is fixed on the cover body;
a water inlet 11 is formed in the bottom of the side wall of the barrel body 1, a water outlet hole 12 is formed in the cover body on the top of the side wall of the barrel body 1 and opposite to the water inlet 11, and the water inlet 11 is connected with a water supply pipe to provide cold water to be heated for the water heater; the water outlet hole 12 is connected with a water outlet pipe and outputs hot water heated by the water heater.
The bottom of the cylinder body 1 is provided with a base, the side surface of the base is provided with a smoke exhaust channel 13, and the smoke exhaust channel 13 is provided with a backpressure detection interface 14 for detecting the pressure of the discharged smoke.
The side wall of the bottom of the barrel body 1 is also provided with a sewage discharge pipe 15 and a maintenance hand hole 16.
A temperature probe 17 is arranged above the water inlet 11 and used for detecting the temperature of water in the barrel 1.
As shown in fig. 3, the heat exchange mechanism 3 includes an upper top isolation tube plate 31, a lower bottom isolation tube plate 32 and a heat exchange channel 33 therebetween, the diameter of the bottom isolation tube plate 32 is larger than that of the top isolation tube plate 31, and the edge of the bottom isolation tube plate 32 is fixed above the base of the cylinder 1, so that the heat exchange mechanism 3 is fixed inside the cylinder 1. The heat exchange channels 33 are a plurality of heat exchange tubes, the top and bottom of the heat exchange channels are connected with the top isolation tube plate 31 and the bottom isolation tube plate 32 in a penetrating and welding mode, and the heat exchange tubes are circumferentially distributed by taking the axis of the cylinder as a central axis.
The two ends of the heat exchange tube are cylindrical joints, the middle part of the heat exchange tube is flat, the width of the middle part of the heat exchange tube is larger than the outer diameter of the tube at the joint, and the thickness of the middle part of the heat exchange tube is smaller than the outer diameter of the tube at the joint. The middle portion has the same thickness and the opposite side walls are parallel to each other.
As an exemplary embodiment, the middle portion of the heat exchange tube has a wave shape, and may have a straight shape, or a combination of wave and straight shapes.
As the corrugated heat exchange tube structure, a flat tube structure of a flat heat exchange unit provided in a corrugated heat exchange tube of the prior patent application No. CN202020088271.8 of the applicant can be used.
As shown in fig. 2, the combustion system 4 includes a direct current variable frequency fan 41 for introducing air, a gas pipe 42 for introducing gas, a premixing device 43 for mixing air and gas, a zero pressure valve metal fiber burner 44, an ignition needle 45, a fire detection needle 46, and a heat insulation plate 47;
a gas valve is arranged on the gas pipe 42;
the heat insulation plate 47 is fixedly arranged at the top of the barrel 1;
the fan 41 and the gas pipe 42 are respectively connected to a premixing cavity of the premixing device 43, the lower part of the premixing device 43 is connected to the burner 44, the fan 41, the gas pipe 42 and the premixing device 43 are arranged above the heat insulation plate 47, and the burner 44 is arranged below the heat insulation plate 47 and positioned inside the combustion chamber 2;
an ignition needle 45 and a fire detection needle 46 for detecting flame are further arranged on the heat insulation plate 47.
The spark produced by the ignition needle 45 ignites the gas, the gas is burnt at the burner head of the burner 44, and the flue gas enters the heat exchange channel 33 from the combustion chamber 2 and is discharged from the smoke discharge channel 13 at the base at the bottom of the cylinder 1. The water in the hot water cavity outside the combustion chamber and the heat exchange channel is heated to become hot water.
The fully premixed combustion wave type fire tube gas water heater provided by the utility model can absorb partial latent heat in the flue gas while more effectively absorbing the sensible heat of the flue gas, thereby having higher heat exchange efficiency, condensation effect and higher corrosion resistance.
The combustion chamber has large diameter and large volume, has enough area to absorb the radiant heat generated by the combustor, and has enough space to uniformly distribute the generated high-temperature flue gas, thereby reducing the pressure fluctuation condition during ignition and improving the ignition success rate.
The wavy heat exchange tubes can enable flue gas to continuously wash the tube walls and blow condensed water and impurities away from the tube walls, so that the probability of blockage of the heat exchange tubes is reduced; the heat transfer area is increased, and the heat transfer efficiency is improved.
The flame propagation speed of the fully premixed combustion provided by the utility model is high, and the volumetric heat intensity of the combustion chamber is very high and can generally reach 28-56 x 103kW/m2Or higher, and can achieve complete combustion with a small excess air factor (actual air usage/theoretical air usage), with almost no chemical incomplete combustion.
The burner is a burner head on the surface of the metal fiber braided fabric, and the mixture of gas and air is ignited after permeating through the surface of the metal fiber uniformly, so that a very thin layer of blue flame is formed on the cylinder wall only. Meanwhile, the cylinder wall is heated to a high temperature to form a high-temperature radiation source, the metal fiber burner is also called a surface burner, and the surface combustion has the advantages of high combustion efficiency, less emission of pollutants (CO, NOx and the like) of combustion products and the like.
The wave-shaped heat exchange tube enables hot gas flowing through the wave-shaped heat exchange tube to gradually and smoothly change the direction, thereby effectively reducing the length of a boundary layer and greatly improving the heat exchange efficiency and the heat flux density compared with a straight tube. These slight bends provide sufficient capacity to improve heat transfer to achieve good heat exchange.
The corrugated heat exchange tubes have certain elasticity and can be bent when subjected to thermal expansion or stress, so that the heat exchanger cannot bear too much stress on the position of the tube plate.
The combustion chamber diameter that is located the heat exchange tube top is great, and the volume is big, possess the radiant heat that sufficient area absorbed the combustor produced, possess the high temperature flue gas that sufficient space equipartition produced simultaneously, has reduced the pressure oscillation condition when igniteing, has improved the success rate of igniteing.
The structure of the overhead burner accords with the physical law, and the condensed water generated by the condensation of the flue gas falls downwards under the action of self gravity and the scouring action of the flue gas.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A full-premixing combustion wave type fire tube gas water heater is characterized by comprising a cylinder, a combustion chamber, a heat exchange mechanism and a combustion system, wherein the combustion chamber and the heat exchange mechanism are arranged in the cylinder; the combustion chamber is positioned above the heat exchange mechanism;
the cavity inside the cylinder body and between the combustion chamber and the heat exchange mechanism is a hot water cavity;
the top of the cylinder body is provided with a cover body, and the combustion system is fixed on the cover body.
2. The gas water heater with the wave-type fire tube and the fully premixed combustion as claimed in claim 1, wherein a water inlet is formed at the bottom of the side wall of the barrel, a water outlet is formed on the cover body at the top of the side wall of the barrel opposite to the water inlet, the water inlet is connected with a water supply pipe, and the water outlet is connected with a water outlet pipe.
3. The gas water heater with the wave-type fire tube and the fully premixed combustion as claimed in claim 2, wherein a base is arranged at the bottom of the cylinder, a smoke exhaust channel is arranged on the side surface of the base, and a backpressure detection interface for detecting the pressure of the discharged smoke is arranged on the smoke exhaust channel.
4. The gas water heater with the wave-type fire tube and the fully premixed combustion as claimed in claim 3, wherein a blow-off pipe and a maintenance hand hole are further formed in the side wall of the bottom of the barrel; a temperature probe is arranged above the water inlet.
5. The full premix combustion wave fire tube gas water heater of claim 4, wherein the heat exchange mechanism comprises an upper top isolation tube plate, a lower bottom isolation tube plate and a heat exchange channel therebetween, the bottom isolation tube plate is larger in diameter than the top isolation tube plate, and the edge of the bottom isolation tube plate is fixed above the base of the barrel; the heat exchange channel comprises a plurality of heat exchange tubes, the heat exchange tubes are circumferentially distributed by taking the axis of the cylinder as a central axis, and the top and the bottom of the heat exchange tubes are distributed and connected with the top isolation tube plate and the bottom isolation tube plate in a penetrating and welding manner.
6. The gas water heater with the wave-type fire tube and the fully premixed combustion as claimed in claim 5, wherein the heat exchange tube is provided with cylindrical joints at two ends, the middle part of the heat exchange tube is flat, the width of the middle part of the heat exchange tube is larger than the outer diameter of the heat exchange tube at the joints, and the thickness of the middle part of the heat exchange tube is smaller than the outer diameter of the heat exchange tube at the joints; the middle part has the same thickness, and the opposite side walls are parallel to each other.
7. The full premix combustion wavy fire tube gas water heater of claim 6, wherein the heat exchange tube middle portion is wavy, or straight, or a combination of wavy and straight.
8. The fully premixed combustion wavy fire tube gas water heater of claim 7, wherein the combustion system comprises a fan for introducing air, a gas pipe for introducing gas, a premixing device for mixing air and gas, a burner and a heat insulation plate;
a gas valve is arranged on the gas pipe;
the heat insulation plate is fixedly arranged at the top of the cylinder body;
the fan and the gas pipe are respectively connected to the premixing device, the lower portion of the premixing device is connected to the burner, the fan, the gas pipe and the premixing device are arranged above the heat insulation plate, and the burner is arranged below the heat insulation plate and located inside the combustion chamber.
9. The gas water heater with the fully premixed combustion wavy fire tube according to claim 8, wherein an ignition needle and a flame detection needle for detecting flame are further arranged on the heat insulation plate.
10. The all premixed combustion wavy fire tube gas water heater of claim 9, wherein the burner is a zero pressure valve metal fiber burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220176146.1U CN216897838U (en) | 2022-01-21 | 2022-01-21 | Full-premixing combustion wave type fire tube gas water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220176146.1U CN216897838U (en) | 2022-01-21 | 2022-01-21 | Full-premixing combustion wave type fire tube gas water heater |
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| Publication Number | Publication Date |
|---|---|
| CN216897838U true CN216897838U (en) | 2022-07-05 |
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ID=82180200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220176146.1U Active CN216897838U (en) | 2022-01-21 | 2022-01-21 | Full-premixing combustion wave type fire tube gas water heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216897838U (en) |
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2022
- 2022-01-21 CN CN202220176146.1U patent/CN216897838U/en active Active
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