CN212618288U

CN212618288U - Gas water heater

Info

Publication number: CN212618288U
Application number: CN202020974597.0U
Authority: CN
Inventors: 钱晓林; 梁泽锋; 曲绍鹤
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2019-10-17
Filing date: 2020-05-30
Publication date: 2021-02-26
Anticipated expiration: 2030-05-30
Also published as: CN112682790B; CN112682789A; CN112682788B; CN212618285U; CN112682780A; CN112682787A; CN112682788A; CN112682792A; WO2021244493A1; CN112682781A; CN112682790A; CN112682784A; CN112682787B; CN112682791A; CN213272606U; CN112682782A; CN212618287U; CN212618286U; CN112682783B; CN212618283U

Abstract

The utility model discloses a gas water heater, including shell, heat exchanger and combustor, be formed with the heat exchange chamber in the shell, seted up the exhanst gas outlet on the locular wall of heat exchange chamber, in heat exchanger located the heat exchange chamber, the combustor was used for carrying gas and/or air to the heat exchange chamber after preheating to predetermined target temperature to spray gas and/or air in the heat exchange chamber, so that carry out high temperature air combustion reaction in the heat exchange chamber. The utility model discloses in, carry out high temperature air combustion reaction in the heat exchange chamber, compare in traditional combustion method, burning flame is thick, the indoor temperature of heat exchange is even, the utility model discloses a gas heater directly utilizes high temperature air combustion method to heat exchanger heating, and heat exchange efficiency is high to need not to set up in addition and heat exchange chamber divided combustion chamber, make gas heater's overall structure compacter, the volume is littleer.

Description

Gas water heater

This application claims priority from chinese patent application entitled "burner and gas water heater" filed on 17/10/2019, application No. 201910992986.8, the entire contents of which are incorporated herein by reference.

Technical Field

The utility model relates to a gas heater technical field, in particular to gas heater.

Background

A gas water heater generally includes a combustion chamber into which gas is introduced and ignited to generate heat, and a heat exchange chamber into which flue gas generated by combustion of the gas is guided to transfer the heat to cold water flowing through the heat exchanger for the purpose of preparing hot water.

However, in the existing gas water heater, the combustion chamber and the heat exchange chamber are usually arranged separately, so that the overall volume of the gas water heater is large.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a gas heater who has high temperature air combustion function, compact structure and heat exchange efficiency height.

In order to achieve the above object, the utility model provides a gas water heater, gas water heater includes:

the heat exchanger comprises a shell, a heat exchange chamber is formed in the shell, and a flue gas outlet is formed in the wall of the heat exchange chamber;

a heat exchanger disposed in the heat exchange chamber; and the number of the first and second groups,

the burner is used for preheating fuel gas and/or air to a preset target temperature and then conveying the fuel gas and/or air to the heat exchange chamber, and injecting the fuel gas and/or air into the heat exchange chamber so as to enable the high-temperature air combustion reaction to be carried out in the heat exchange chamber.

In one embodiment, the heat exchangers are distributed in an enclosing manner in the heat exchange chamber to form an enclosing area, and the combustor injects fuel gas and/or air into the enclosing area so as to enable high-temperature air combustion reaction to be carried out in the enclosing area.

In one embodiment, the heat exchanger comprises:

a water inlet pipeline;

a water outlet pipeline; and the number of the first and second groups,

and the heat exchange pipeline is arranged in the heat exchange chamber and connected with the water inlet pipeline and the water outlet pipeline, and the heat exchange pipeline is enclosed to form the enclosed area.

In one embodiment, the heat exchange pipes are spaced from the chamber wall of the heat exchange chamber, and a gap is formed between the heat exchange pipes, so that the flue gas generated in the enclosure area flows to the flue gas outlet through the gap.

In one embodiment, the heat exchange pipeline is spirally wound around the periphery of the enclosing area by taking the central shaft as a circle center.

In one embodiment, every two adjacent rows of heat exchange pipes are arranged at intervals in the extending direction of the central shaft to form the gap.

In an embodiment, the burner comprises a gas injection port for injecting gas into the enclosure, the gas injection port being located at the central axis.

In an embodiment, the central shaft extends in an up-and-down direction, the gas injection port is located at a lower end of the enclosing area, and the injection direction is arranged upward.

In an embodiment, an isolation sealing member is arranged at the upper end of the heat exchange pipeline, and the isolation sealing member is used for sealing the upper end of the enclosure area.

In one embodiment, the isolation sealing element is a sealing plate, and the sealing plate is made of a flame-retardant heat-insulating sealing material;

or, the isolating and sealing elements are a plurality of rows of mutually adjacent heat exchange pipelines;

or the isolation sealing element is a water circuit board, and the water circuit board is communicated with the heat exchange pipeline.

In one embodiment, the gas jet orifice is arranged at one end of the heat exchange chamber, the flue gas outlet is arranged at the other end of the heat exchange chamber, and the heat exchange pipeline is positioned between the gas jet orifice and the flue gas outlet.

In one embodiment, the heat exchange pipeline is provided with fins.

In one embodiment, the burner comprises:

the preheating device is used for preheating fuel gas and/or air to a preset target temperature and then conveying the fuel gas and/or air to the heat exchange chamber;

and the gas burning component is used for spraying gas into the heat exchange chamber.

In one embodiment, the preheating device is an electric heating device, a gas heating device or a heat accumulator heating device.

In one embodiment, the preheating device is a gas heating device, an air inlet chamber and a combustion chamber are further formed in the housing, and the air inlet chamber and the combustion chamber are sequentially communicated with the heat exchange chamber;

the gas heating device includes:

the premixer is used for accessing fuel gas and air, premixing the fuel gas and the air and providing mixed gas for the combustion chamber; and the number of the first and second groups,

a preheating burner having a mixture gas distribution chamber with an air inlet in communication with the premixer and an air outlet in communication with the combustion chamber, the preheating burner for igniting the mixture gas discharged from the mixture gas distribution chamber into the combustion chamber such that the air in the combustion chamber is heated to the target temperature.

The utility model provides a gas water heater includes the shell, heat exchanger and combustor, be formed with the heat exchange chamber in the shell, the exhanst gas outlet has been seted up on the locular wall of heat exchange chamber, heat exchanger locates in the heat exchange chamber, the combustor is used for carrying gas and/or air to the heat exchange chamber after preheating to predetermined target temperature, high temperature preheated air has been realized, combustor jet gas and/or air in the heat exchange chamber, make the high temperature flue gas backward flow, realize keeping warm on the one hand, make the interior gas of combustion chamber can spontaneous combustion, on the other hand dilutes the air, make oxygen concentration be less than a definite value, realize even burning, so, just make and carry out high temperature air combustion reaction in the combustion chamber. The utility model discloses in, carry out the high temperature air combustion reaction in the heat exchange chamber, compare in traditional combustion method, the burning flame of high temperature air burning is thick, the interior bulk temperature of heat exchange chamber is even to can directly utilize the high temperature air combustion method to heat exchanger heating, heat exchange efficiency is high, and need not to set up in addition with heat exchange chamber divided combustion chamber, make gas heater's overall structure compacter, the volume is littleer. And, the structure of this kind of combustor frame can be with the subassembly miniaturization that realizes the high temperature air burning for have more application space and value, the noise is low in addition, and the burning is abundant, and it is little to discharge waste gas pollution, when being applied to gas heater and including gas hanging stove etc. use gas burning to produce high temperature hot water and carry out relevant products and equipment that use such as family's shower and heating, not only satisfied the requirement, but also brought the abundant, low pollutant emission's of burning that the combustor did not possess in the current water heater effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the gas water heater of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Gas water heater	23	Gap
10	Outer casing	30	Enclosed area
				11	Heat exchange chamber	40	Isolation seal
12	Flue gas outlet	50	Gas pipeline
				20	Heat exchange pipeline	61	Air inlet chamber
21	Water inlet pipeline	62	Fan blower
				22	Water outlet pipeline	70	Preheating burner

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

In the existing gas water heater, gas in a combustion chamber generates flame during combustion, the temperature of flame at the edge of the flame is high, the temperature of a flame core is low, and the overall temperature in the combustion chamber is uneven. If directly set up heat exchanger in the combustion chamber, probably lead to heat exchanger local high temperature, reduce heat exchanger's life, another part temperature is too low again, and unable abundant heat transfer is low heat exchange efficiency. Therefore, in the existing gas water heater, a combustion chamber for combustion and a heat exchange chamber for heat exchange are usually arranged in a separated way, and when the gas water heater works, smoke generated by combustion in the combustion chamber is guided to the heat exchanger in the heat exchange chamber to realize heat exchange. However, this structure has a part of heat loss during the flue gas transmission process, and on the other hand, needs to provide a separate combustion chamber and heat exchange chamber in the gas water heater, resulting in a larger overall volume of the gas water heater.

Therefore, the present invention provides a gas water heater 100, please refer to fig. 1, the gas water heater 100 includes a housing 10, a heat exchanger and a burner, a heat exchange chamber 11 is formed in the housing 10, a flue gas outlet 12 is formed on a chamber wall of the heat exchange chamber 11, the heat exchanger is disposed in the heat exchange chamber 11, and the burner is used for preheating gas and/or air to a preset target temperature and then delivering the preheated gas and/or air to the heat exchange chamber 11, and injecting the gas and/or air into the heat exchange chamber 11, so as to perform a high temperature air combustion reaction in the heat exchange chamber 11.

The high-temperature air combustion is called mild and deep low-oxygen dilution combustion, and the mild combustion is called a novel combustion mode for short. The main characteristics of the combustion are as follows: the chemical reactions mainly occur in a high-temperature low-oxygen environment, the temperature of the reactants is higher than the autoignition temperature of the reactants, the maximum temperature rise in the combustion process is lower than the autoignition temperature of the reactants, and the volume fraction of oxygen is diluted to an extremely low concentration by the combustion products. Compared with conventional combustion, in the combustion state, the pyrolysis of fuel is inhibited, the flame thickness is thickened, and the flame front surface disappears, so that the temperature of the whole hearth is very uniform during the combustion, and the emission of pollutants NOx and CO is greatly reduced.

However, achieving high temperature air combustion requires certain conditions: the oxygen concentration at any position in the furnace is required to be ensured to be lower than a certain value, generally lower than 5% -10%, the fuel gas is ensured to be fully combusted and uniformly combusted, the temperature is higher than the self-ignition point of the fuel, and the self-ignition is maintained. This is achieved by means of strong internal recycle dilution of the reactants in the furnace high temperature flue gas rich in N2 and CO 2.

Therefore, the burner in this embodiment is used to preheat the gas and/or air to a preset target temperature, then deliver the preheated gas and/or air to the heat exchange chamber 11, achieve high-temperature preheated air, and inject the gas and/or air into the heat exchange chamber 11. The burner is used for preheating fuel gas and/or air to a preset target temperature and then delivering the fuel gas and/or air to the heat exchange chamber 11, so that the temperature required by high-temperature air combustion is achieved in the heat exchange chamber 11.

In the present embodiment, the burner injects fuel gas and/or air into the heat exchange chamber 11, so that a entrainment effect is formed in the heat exchange chamber 11 (when one fluid flows into the other fluid, because momentum exchange exists between the flowing jet fluid and the primary fluid, this effect makes a part of the primary fluid move with the jet fluid, which is called entrainment effect, and is most prominent in the case that the flowing space of the fluid is small and the fluid is smooth due to the solid wall surface, so that a jet combustion zone and a flue gas recirculation zone are formed in the heat exchange chamber 11, so that part of the high temperature flue gas (the flue gas rich in N2 and CO 2) circulates and dilutes the reactant strongly inside the heat exchange chamber 11, and then the injected fuel gas and air are sufficiently diluted to form a lower oxygen concentration, the combustion reaction speed is reduced, and the circulated high temperature flue gas can maintain a higher temperature in the heat exchange chamber 11, the temperature is ensured to be higher than the self-ignition point of the fuel, so that the self-ignition is realized, and then the ignition is not needed. Thus, high temperature air combustion is realized.

It should be noted that, this embodiment preheats the air through high temperature and cooperates high-speed efflux to realize entrainment high temperature flue gas and dilution, makes 11 gas in heat exchange chamber and air misce bene, and 11 oxygen concentration of heat exchange chamber also can be balanced like this to be less than a definite value, like this, not only the gas can obtain abundant burning during the burning, just so reduced the emission of pollutant, and, also can the burning even in the heat exchange chamber 11, the problem of local combustion too vigorous and noise production can not appear. In addition, the backflow of high-temperature flue gas is realized through high-speed jet entrainment, the temperature of the heat exchange chamber 11 can be kept higher than the self-ignition point of fuel, and the combustion can be maintained as long as the fuel gas is continuously introduced. The heat after burning can exchange heat with the heat exchanger of the gas water heater to realize the hot water production. Wherein, the heat exchange chamber 11 is provided with a flue gas outlet 12, and the burnt waste gas is discharged through the flue gas outlet 12.

It should be noted that the target temperature of the high-temperature preheated air cannot be too low, and cannot be lower than 600 ℃, and is generally controlled to be 600 to 1200 ℃, so that when the high-temperature gas contacts with the fuel gas in the heat exchange chamber 11, better automatic combustion is realized, and ignition are no longer needed. Wherein, the target temperature can be achieved by controlling the heating time, controlling the ratio of fuel gas and air, preserving heat and the like. The injection speed of the gas and/or air is usually predetermined and set through experiments, and is not changed basically thereafter, so that the oxygen concentration in the heat exchange chamber 11 can be realized by controlling the real-time air intake amount, that is, controlling the gas and air intake ratio. The oxygen concentration in the heat exchange chamber 11 can be controlled according to the size of the heat exchange chamber 11 and the control injection speed.

In the present embodiment, the high temperature air combustion reaction is performed in the heat exchange chamber 11, the thickness of the combustion flame is thicker than that of the ordinary flame, and the flame front surface disappears, so that the temperature in the heat exchange chamber 11 is very uniform. The heat exchanger sets up in the heat exchange chamber 11 that carries out high-temperature air combustion reaction, directly utilizes the high-temperature air combustion mode directly to heat exchanger heating, avoids calorific loss among the flue gas transmission process, and each part temperature of heat exchanger is even, and heat exchange efficiency is high. In addition, a combustion chamber separated from the heat exchange chamber 11 is not required to be additionally arranged, so that the overall structure of the gas water heater 100 is more compact and smaller.

According to the combustion characteristics of the high-temperature air combustion, when the high-temperature air combustion reaction is performed in the heat exchange chamber 11, the generated heat is radiated around the combustion flame, and the entire temperature in the heat exchange chamber 11 is high, which tends to cause the chamber wall of the heat exchange chamber 11 to be a heat accumulator. On one hand, the wall material of the chamber is easily damaged, the service life of the gas water heater 100 is shortened, and on the other hand, a large amount of heat is dissipated from the chamber wall, so that energy waste is caused. To this end, referring to fig. 1, on the basis of the previous embodiment, the heat exchangers are distributed in the heat exchange chamber 11 in a surrounding manner to form a surrounding area 30, and the burner injects fuel gas and/or air into the surrounding area 30 to perform a high-temperature air combustion reaction in the surrounding area 30. So, heat exchanger encloses and closes in burning flame setting, has utilized the characteristic of high-temperature air burning, and on the one hand heat exchanger absorbs the heat of the inside external radiation of enclosed area 30 when high-temperature air burns, and heat exchange efficiency is high. On the other hand, the heat exchanger also prevents heat from being conducted to the wall of the heat exchange chamber 11, and functions as a water cooling wall, thereby protecting the wall of the heat exchange chamber 11. Meanwhile, the heat exchanger also plays a role in preserving heat inside the enclosing area 30, so that the temperature required by high-temperature air combustion is maintained inside the enclosing area 30, and the high-temperature air combustion effect is better.

The heat exchanger may have a variety of enclosure configurations for the enclosure 30, as long as it at least partially separates the combustion flame from the walls of the heat exchange chamber 11, and those skilled in the art will appreciate that the greater the extent of the enclosure, the better the heat exchange, thermal insulation, and water wall effects.

The heat exchanger may be in various forms, for example, the heat exchanger may be a plate-shaped water channel plate distributed around the perimeter of the enclosed area 30, or may be a pipe wound or orderly bent around the perimeter of the enclosed area 30. In this embodiment, the heat exchanger includes a water inlet pipe 21, a water outlet pipe 22, and a heat exchange pipe 20, wherein the water inlet pipe 21 is used for connecting a tap water pipe, the water outlet pipe 22 is used for connecting a faucet, a shower head, etc. of a user's home, the heat exchange pipe 20 is disposed in the heat exchange chamber 11 and connected to the water inlet pipe 21 and the water outlet pipe 22, and the heat exchange pipe 20 encloses to form an enclosed area 30. So, adopt pipy heat exchanger, be convenient for make, and can arrange the water route through heat transfer room in order to adapt to the heat transfer demand.

In one embodiment, referring to fig. 1, the heat exchange pipes 20 are spaced from the chamber wall of the heat exchange chamber 11, and a gap 23 is formed between the heat exchange pipes 20, so that the flue gas generated in the enclosure area 30 flows to the flue gas outlet 12 through the gap 23. In this embodiment, the flue gas generated in the enclosed area 30 flows from the gap 23 to the outside of the enclosed area 30, so that the flue gas is fully contacted with the side surface of the heat exchange pipeline 20 facing the enclosed area 30, the side surface facing the wall of the heat exchange chamber 11, and the side surface facing the gap 23, thereby ensuring that the heat exchange pipeline 20 fully exchanges heat with the flue gas in the process of flowing from the enclosed area 30 to the flue gas outlet 12, and improving the heat exchange efficiency.

Based on the above embodiment, the heat exchange pipeline 20 is spirally wound around the periphery of the enclosing area 30 with the central axis as the center. Therefore, the heat exchange pipeline 20 is convenient to manufacture, the bending radian is small, the resistance of water flow inside the pipeline is small, and the water flow can smoothly flow in the heat exchange pipeline 20.

Preferably, every two adjacent rows of heat exchange tubes 20 are spaced apart in the extension direction of the central axis to form a gap 23. Therefore, the flue gas uniformly flows out of the enclosing area 30 between every two adjacent rows of heat exchange pipelines 20, each row of heat exchange pipelines 20 is fully contacted with the flue gas, the contact area between the flue gas and the heat exchange pipelines 20 is increased, and the heat exchange efficiency is improved.

In one embodiment, the burner includes a gas injection port for injecting gas into the enclosed region 30. It can be understood that the injection speed of the gas injection port is usually predetermined and set by experiment, and is not substantially changed thereafter, so that the oxygen concentration in the enclosure 30 can be controlled by controlling the amount of the intake air, i.e. the ratio of the gas to the intake air. Thus, the present embodiment satisfies the conditions for high temperature air combustion MILD combustion: high-temperature preheating air is matched with high-speed jet flow to realize entrainment of high-temperature flue gas and dilution of air jet flow, so that the oxygen concentration is lower than a certain value, and the temperature is higher than the self-ignition point of fuel. In the present embodiment, the gas injection port is located at the central axis. Specifically, the fuel gas injection port may be located in the middle of the heat exchange pipeline 20, or may be located at two ends of the heat exchange pipeline 20, as long as the fuel gas injection port injects fuel gas into the enclosed area 30. Therefore, the distance between the fuel gas jet orifice and the heat exchange pipeline 20 on the peripheral side is close, so that the temperature of each part of the heat exchange pipeline 20 is uniform, and the heat exchange efficiency is favorably improved. Preferably, the gas jet orifice is located the one end of pipeline, so, the space size of the gas efflux both sides that erupt is balanced, and is located the bottom, has guaranteed gaseous jet distance, and the entrainment air current of formation is balanced, makes gas and the air in the whole enclosed area 30 obtain fully diluting the mixture.

The extending direction of the central shaft can be various, preferably, the central shaft extends along the up-and-down direction, the gas jet is located at the lower end of the enclosing area 30, and the jet direction is arranged upwards. In this manner, the heat distribution within the enclosure 30 is made more uniform by the upward flame and upward heat flow characteristics.

Because the heat exchange pipeline 20 is spirally wound around the periphery of the enclosed area 30 with the central axis as the center of circle, if the upper portion of the enclosed area 30 is opened, a chimney effect is generated in the enclosed area 30, and the flue gas and heat are directly dissipated from the upper portion of the enclosed area 30, thereby reducing the heat exchange efficiency. For this purpose, on the basis of the above embodiment, the upper end of the heat exchange pipeline 20 is provided with an isolation seal 40, and the isolation seal 40 is used for blocking the upper end of the enclosure area 30. In this way, a chimney effect is avoided in the enclosed area 30, and the flue gas is guided to flow out from the gaps 23 between the rows of heat exchange pipelines 20, so that sufficient heat exchange is realized.

The particular form of the isolation seal 40 may vary. For example, the isolation seal 40 may be a sealing plate made of a flame retardant, heat insulating sealing material. Thus, the upper end of the enclosed area 30 can be completely sealed, and the chimney effect is avoided. Alternatively, the insulating seals 40 are rows of mutually adjacent heat exchange tubes 20. Alternatively, the isolation seal 40 is a waterway plate, and the waterway plate is communicated with the heat exchange pipeline 20. So, form effectual shutoff to enclosing district 30 upper portion to promote heat exchange efficiency, and increase the basal area of heat transfer pipeline 20 and flue gas, further promote energy utilization.

In one embodiment, the gas jet is disposed at one end of the heat exchange chamber 11, the flue gas outlet 12 is disposed at the other end of the heat exchange chamber 11, and the heat exchange pipeline 20 is disposed between the gas jet and the flue gas outlet 12. Therefore, the flow path of the flue gas is prolonged, the flue gas fully exchanges heat with the heat exchange pipeline 20 in the heat exchange chamber 11 and then flows out, and the heat exchange efficiency is improved. Meanwhile, the temperature change is prevented from being large due to the fact that the flue gas in the heat exchange chamber 11 is rapidly discharged, and therefore the high temperature of the flue gas in the enclosing area 30 is guaranteed to be at or above the target temperature, and the high-temperature air combustion can be continued.

In an embodiment, the heat exchange pipeline 20 is provided with fins to increase the heat exchange area of the heat exchange pipeline 20, thereby improving the heat exchange efficiency and the energy utilization rate.

The method for realizing high-temperature air combustion can be various, and particularly, in the embodiment, the combustor comprises a preheating device and a gas burning assembly. The preheating device is used for preheating fuel gas and/or air to a preset target temperature and then conveying the fuel gas and/or air to the heat exchange chamber 11, and the fuel gas assembly is used for injecting the fuel gas into the heat exchange chamber 11. In the embodiment, the preheating device is used for preheating the fuel gas and/or air delivered to the heat exchange chamber 11, so that the temperature in the heat exchange chamber 11 reaches the temperature required by the combustion of the high-temperature air, and the preset target temperature cannot be lower than 600 degrees celsius, and is generally controlled to be 600 to 1200 degrees celsius. And the gas subassembly is used for spouting the gas in heat exchange chamber 11, make the formation entrainment effect in the combustion area, make and form injection combustion area and flue gas backward flow district in heat exchange chamber 11, make partial high temperature flue gas strong circulation in the combustion area, then fully dilute the gas of spouting and air, form lower oxygen concentration, reduce the combustion reaction speed, the higher temperature in combustion area can be maintained simultaneously to the high temperature flue gas of circulation, guarantee that the temperature is higher than the spontaneous combustion point of fuel, realize the spontaneous combustion, then do not need the ignition.

In an embodiment, the gas assembly includes a gas pipeline 50, a gas proportional valve and a gas injection port, the gas pipeline 50 is used for connecting to the gas pipeline 50 of the user to obtain a gas source, the gas proportional valve is disposed on the gas pipeline 50, and the gas injection port is disposed in the heat exchange chamber 11 and is communicated with the gas pipeline 50. It will be appreciated that the injection rate of the gas assembly is generally predetermined and set by experiment and is not substantially changed thereafter, and therefore the oxygen concentration in the enclosure 30 can be controlled by controlling the amount of inlet air, i.e. the ratio of gas to inlet air. Thus, the present embodiment satisfies the conditions for high temperature air combustion MILD combustion: high-temperature preheating air is matched with high-speed jet flow to realize entrainment of high-temperature flue gas and dilution of air jet flow, so that the oxygen concentration is lower than a certain value, and the temperature is higher than the self-ignition point of fuel. The heat after combustion is transmitted to a heat exchanger for heat exchange so as to realize the production of hot water.

The form of the preheating device can be various, and in some embodiments, the gas water heater 100 realizes the preheating of the air and/or the gas through an auxiliary heating form. In particular, in an embodiment, the pre-heating means is an electric heating means. Specifically, the fan 62 may be used to suck in external air, and electric heating elements such as electric heating wires and electric heating tubes may be used to heat the air in a relatively closed space, and reference may be made to a heating wind device such as a hair dryer. Thus, the air can be heated to the target temperature through the electric heating device to realize high-temperature air preheating.

In another embodiment, a gas fired heating device or a thermal mass heating device. Specifically, the heat accumulator may have a honeycomb ceramic structure, and in the operation of the gas water heater 100, the heat accumulator stores heat generated in combustion, and the fan 62 is used to suck external air into the heat exchanger 11 and transport the air to the heat exchanger after passing through the heat accumulator, so as to preheat the air at a high temperature.

On the basis of the two embodiments, the burner further comprises an ignition assembly, wherein the ignition assembly is arranged in the heat exchange chamber 11 and is used for igniting gas in the heat exchange chamber 11 to realize high-temperature air combustion. In this embodiment, when the high-temperature air heated by the preheating device and reaching the target temperature is introduced into the heat exchange chamber 11, the gas proportional valve may be controlled to open, the gas is introduced into the heat exchange chamber 11, the ignition assembly is controlled to perform the ignition operation at this time, the gas may be ignited, and after the ignition operation, the ignition operation is stopped, so as to save energy. It should be noted that the present embodiment has the advantages of small and simple structure, and easy implementation, and can be easily implemented in the gas water heater 100 without increasing the cost.

In the embodiment, the preheating of the air is realized by a direct combustion mode. Referring to fig. 1, an air intake chamber 61 and a combustion chamber are further formed in the housing 10, and the air intake chamber 61 and the combustion chamber are sequentially communicated with the heat exchange chamber 11. The preheating device is a gas heating device, the gas heating device comprises a pre-mixer and a preheating burner 70, the pre-mixer is used for inputting gas and air and pre-mixing, and providing mixed gas for the combustion chamber, the preheating burner 70 is provided with a mixed gas distribution chamber, the gas inlet of the mixed gas distribution chamber is communicated with the pre-mixer, the gas outlet of the mixed gas distribution chamber is communicated with the combustion chamber, and the preheating burner 70 is used for igniting the mixed gas discharged from the mixed gas distribution chamber into the combustion chamber, so that the air in the combustion chamber is heated to a target temperature. In an embodiment, the preheat combustor 70 may be a fully premixed combustor.

In this embodiment, the air inlet chamber 61 is used for providing relatively uniform external air to the combustion chamber, and the pre-mixer delivers the mixed gas to the mixed gas distribution chamber of the preheating burner 70, and then the mixed gas enters the combustion chamber, and is ignited by the preheating burner 70, so that the mixed gas is combusted to heat the air in the combustion chamber, thereby forming high-temperature flue gas. It will be appreciated that by controlling the heating temperature, the air in the combustion chamber can be heated to a target temperature, and thus, high temperature preheating of the air is achieved. After the high-temperature gas after high-temperature preheating is sent into the heat exchange chamber 11, the gas assembly is controlled to spray the gas, the gas is combined with the high-temperature gas, the high-temperature gas ignites the gas, high-temperature air combustion is formed in the heat exchange chamber 11, the gas is sprayed through the gas assembly, a entrainment effect can be formed in the heat exchange chamber 11, a spraying combustion area and a flue gas backflow area are formed in the heat exchange chamber 11, partial flue gas is strongly circulated in the heat exchange chamber 11, the sprayed gas and the air are fully diluted, lower oxygen concentration is formed, the combustion reaction speed is reduced, higher temperature in the heat exchange chamber 11 is maintained, the temperature is higher than the spontaneous combustion point of the fuel, and spontaneous combustion is realized. Thus, the present embodiment satisfies the conditions for high temperature air combustion MILD combustion: high-temperature preheating air is matched with high-speed jet flow to realize entrainment of high-temperature flue gas and dilution of air jet flow, so that the oxygen concentration is lower than a certain value, and the temperature is higher than the self-ignition point of fuel. The heat generated by the combustion can exchange heat with the heat exchanger of the gas water heater 100 to produce hot water. Combine the embodiment of above-mentioned combustor, explain the utility model discloses the theory of operation that the gas heater 100 in this embodiment is applied to the combustor:

the gas water heater 100 is started, the air and the gas mixed by the pre-mixer according to a certain proportion are provided to the preheating burner 70, the ignition device is ignited, the combustion starts in the combustion chamber, the fan 62 corresponding to the air inlet chamber also acts to suck the air required by the combustion, the cold air and the high-temperature flue gas generated by the combustion of the preheating burner 70 are stirred and mixed for many times in a plurality of mixing zones to form high-temperature flue gas, when the temperature measuring device detects that the temperature of the high-temperature flue gas reaches the temperature required by the combustion of the high-temperature air, the gas proportion valve provides the gas to the gas pipeline 50, the gas required by the combustion of the high-temperature air is injected into the heat exchange chamber 11 from the gas injection port connected with the gas pipeline 50 to be combined with the high-temperature gas, the high-temperature gas is ignited, the high-temperature air combustion is formed in the enclosure zone 30 in the heat exchange chamber 11, the jet combustion area and the flue gas reflux area are formed in the heat exchange chamber 11, so that part of the flue gas is intensively circulated in the heat exchange chamber 11, the jetted fuel gas and air are fully diluted to form lower oxygen concentration, the combustion reaction speed is reduced, the higher temperature of the heat exchange chamber 11 is maintained, the temperature is higher than the self-ignition point of the fuel, and the self-ignition is realized. Thus, the present embodiment satisfies the conditions for high temperature air combustion MILD combustion: high-temperature preheating air is matched with high-speed jet flow to realize entrainment of high-temperature flue gas and dilution of air jet flow, so that the oxygen concentration is lower than a certain value, and the temperature is higher than the self-ignition point of fuel. The heat after combustion can exchange heat with the heat exchanger of the gas water heater 100 and then be discharged to the outside, so as to realize the production of hot water.

It can be appreciated that the gas water heater 100 is capable of effectively reducing CO and NOx emissions and reducing noise of the gas water heater 100 due to the use of the burner in the gas water heater 100.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A gas water heater, comprising:

2. The gas water heater of claim 1, wherein said heat exchangers are distributed in an enclosure within said heat exchange chamber to form an enclosure, said burner injecting gas and/or air into said enclosure to cause a high temperature air combustion reaction within said enclosure.

3. The gas water heater of claim 2, wherein the heat exchanger comprises:

a water inlet pipeline;

a water outlet pipeline; and the number of the first and second groups,

4. A gas water heater as claimed in claim 3, wherein said heat exchange tubes are spaced from the walls of said heat exchange chamber with gaps therebetween, such that flue gas generated in said enclosed area flows through said gaps to said flue gas outlet.

5. The gas water heater of claim 4, wherein said heat exchange line is helically coiled around the periphery of said enclosed area about a central axis.

6. The gas water heater of claim 5, wherein every two adjacent rows of heat exchange tubes are spaced apart in the direction of extension of said central axis to form said gap.

7. The gas water heater of claim 5, wherein said burner includes a gas injection port for injecting gas into said enclosed area, said gas injection port being located at said central axis.

8. The gas water heater of claim 7, wherein said central shaft extends in an up-down direction, said gas injection port is located at a lower end of said enclosed area, and an injection direction is disposed upward.

9. The gas water heater of claim 8, wherein an upper end of said heat exchange line is provided with an isolation seal for sealing off an upper end of said enclosed area.

10. The gas water heater of claim 9, wherein the isolation seal is a sealing plate made of a flame retardant, heat insulating sealing material;

11. The gas water heater of claim 7, wherein said gas injection port is disposed at one end of said heat exchange chamber, said flue gas outlet is disposed at the other end of said heat exchange chamber, and said heat exchange line is disposed between said gas injection port and said flue gas outlet.

12. The gas fired water heater of claim 11, wherein said heat exchange line is finned.

13. The gas water heater of claim 1, wherein the burner comprises:

the preheating device is used for preheating fuel gas and/or air to a preset target temperature and then conveying the fuel gas and/or air to the heat exchange chamber; and the number of the first and second groups,

14. The gas water heater of claim 13, wherein said preheating means is an electric heating means, a gas heating means or a heat accumulator heating means.

15. The gas water heater of claim 14, wherein said preheating device is a gas heating device, and an air inlet chamber and a combustion chamber are further formed in said housing, said air inlet chamber and said combustion chamber being in communication with said heat exchange chamber in sequence;

the gas heating device includes: