Burner and gas water heater

Abstract

The present invention discloses a burner and a gas water heater. The burner includes a housing, a partition plate, a preheating combustion device, a gas swirl nozzle and / or an air swirl nozzle mounted on the partition plate. The partition plate is mounted inside the housing and is used to divide the inner cavity of the housing into a combustion chamber and a gas distribution chamber. The combustion chamber has a flue gas outlet. The gas distribution chamber forms an independent premixing chamber, a gas distribution chamber and an air distribution chamber. The premixing chamber is used for premixing the gas and air introduced therein. The preheating combustion device is mounted on the partition plate and is used to ignite the mixed gas discharged from the premixing chamber into the combustion chamber and heat the temperature in the combustion chamber to a preset temperature. The gas swirl nozzle is used to inject the gas flow in the gas distribution chamber into the combustion chamber in a swirling form, and the air swirl nozzle is used to inject the air flow in the air distribution chamber into the combustion chamber in a swirling form. The burner of the present invention has a more uniform heat flow distribution, more complete combustion, and greatly enhanced radiative heat transfer.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 201910992986.8 and the application title "Burner and Gas Water Heater", which was filed on October 17, 2019. The full text thereof is hereby incorporated by reference. Technical Field

[0002] The present invention relates to the technical field of high-temperature air combustion, and particularly to a burner and a gas water heater. Background Art

[0003] High temperature air combustion is called "gentle and deep low-oxygen dilution combustion", abbreviated as gentle combustion, which is a new type of combustion method, also known as MILD combustion. The main characteristics of this combustion are: the chemical reaction mainly occurs in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than their natural temperature, and the maximum temperature rise during the combustion process is lower than their natural temperature. The volume fraction of oxygen is diluted to an extremely low concentration by the combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature of the entire furnace is very uniform during this combustion, and the emissions of pollutants NOx and CO are greatly reduced.

[0004] Although high temperature air combustion has the above-mentioned many advantages, at present, there is no professional burner to achieve the above-mentioned high temperature air combustion. In the related art, the gas required for high temperature air combustion is injected into the combustion chamber through the central pipe, and the air required for high temperature air combustion is injected into the combustion chamber through the tangential air nozzle, resulting in uneven combustion in the combustion chamber and unable to achieve full and uniform combustion in the entire combustion chamber, thus leading to poor heat transfer effect.

[0005] The above content is only used to assist in understanding the technical solution of the invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main object of the present invention is to propose a burner, aiming to solve one or more of the above-mentioned technical problems.

[0007] To achieve the above object, the burner proposed by the present invention includes a housing, a partition, a preheating combustion device, a gas swirl nozzle and / or an air swirl nozzle;

[0008] The partition is installed in the housing and is used to divide the inner cavity of the housing into a combustion chamber and a gas distribution chamber. A high temperature air combustion reaction occurs in the combustion chamber. The combustion chamber has a flue gas outlet. The gas distribution chamber is formed with an independent premixing chamber, a gas distribution chamber and an air distribution chamber. The premixing chamber is used for premixing the gas and air introduced therein;

[0009] The preheating combustion device is installed on the partition plate. The preheating combustion device is used to ignite the mixed gas discharged from the premixing chamber into the combustion chamber and heat the temperature in the combustion chamber to a preset temperature;

[0010] The gas swirl nozzle is installed on the partition plate and is used to inject the airflow in the gas distribution chamber into the combustion chamber in a swirling form; and / or

[0011] The air swirl nozzle is installed on the partition plate and is used to inject the airflow in the air distribution chamber into the combustion chamber in a swirling form.

[0012] In one embodiment, the burner further includes a central cylinder installed in the gas distribution chamber, and a premixing chamber communicating with the combustion chamber is formed in the central cylinder.

[0013] In one embodiment, the burner further includes a shroud installed in the gas distribution chamber. The shroud surrounds the periphery of the central cylinder. One of the gas distribution chamber and the air distribution chamber is defined between the central cylinder and the shroud, and the other of the gas distribution chamber and the air distribution chamber is defined between the shroud and the outer shell.

[0014] In one embodiment, the shroud includes a cylindrical part and a plurality of convex parts connected to each other. The plurality of convex parts are arranged at intervals along the circumferential direction of the cylindrical part, and the distance between the convex part and the central cylinder is greater than the distance between the cylindrical part and the central cylinder.

[0015] In one embodiment, the air distribution chamber is defined between the cylindrical part, the convex part and the central cylinder, and the gas distribution chamber is defined between the cylindrical part, the convex part and the outer shell. An air swirl nozzle is arranged at a position on the partition plate corresponding to a convex part, and the plurality of air swirl nozzles and the plurality of gas swirl nozzles are arranged in a circular pattern.

[0016] In one embodiment, the included angle between the projection line of the gas swirl nozzle on the partition plate and the line connecting the center of the partition plate and the root of the gas swirl nozzle is greater than or equal to 30 degrees and less than or equal to 150 degrees; and / or,

[0017] The included angle between the projection line of the air swirl nozzle on the partition plate and the line connecting the center of the partition plate and the root of the air swirl nozzle is greater than or equal to 30 degrees and less than or equal to 150 degrees.

[0018] In one embodiment, the included angle between the gas swirl nozzle and the partition plate is greater than or equal to 30 degrees and less than or equal to 80 degrees; and / or,

[0019] The included angle between the air swirl nozzle and the partition plate is greater than or equal to 30 degrees and less than or equal to 80 degrees.

[0020] In one embodiment, the number of the gas swirl nozzles and the air swirl nozzles is multiple. The multiple gas swirl nozzles are arranged at intervals along the circumferential direction of the partition plate, and the multiple air swirl nozzles are arranged at intervals along the circumferential direction of the partition plate.

[0021] In one embodiment, one air swirl nozzle is arranged between two adjacent gas swirl nozzles.

[0022] In one embodiment, the swirl directions of the multiple gas swirl nozzles are the same, the swirl directions of the multiple air swirl nozzles are the same, and the swirl direction of the gas swirl nozzles is opposite to the swirl direction of the air swirl nozzles.

[0023] In one embodiment, the swirl directions of the multiple gas swirl nozzles and the multiple air swirl nozzles are the same.

[0024] In one embodiment, the preheating combustion device includes a preheating burner. The air inlet of the preheating burner is communicated with the premixing chamber, and the air outlet is arranged in the combustion chamber.

[0025] The present invention also provides a gas water heater, which includes a main body, a heat exchanger and a burner. Among them, the burner includes a housing, a partition plate, a preheating combustion device, a gas swirl nozzle and / or an air swirl nozzle;

[0026] The partition plate is installed in the housing and is used to divide the inner cavity of the housing into a combustion chamber and a gas distribution chamber. A high-temperature air combustion reaction takes place in the combustion chamber. The combustion chamber has a flue gas outlet. The gas distribution chamber is formed with independent premixing chamber, gas distribution chamber and air distribution chamber. The premixing chamber is used for premixing the gas and air introduced into it;

[0027] The preheating combustion device is installed on the partition plate. The preheating combustion device is used to ignite the mixed gas discharged from the premixing chamber into the combustion chamber and heat the temperature in the air preheating chamber to a preset temperature;

[0028] The gas swirl nozzle is installed on the partition plate and is used to inject the air flow in the gas distribution chamber into the combustion chamber in a swirling form; and / or

[0029] The air swirl nozzle is installed on the partition plate and is used to inject the air flow in the air distribution chamber into the combustion chamber in a swirling form;

[0030] A heat exchange chamber and a smoke exhaust port communicated with the heat exchange chamber are arranged in the main body. The heat exchanger is arranged in the heat exchange chamber, and the flue gas outlet of the burner is communicated with the heat exchange chamber.

[0031] The burner of the present invention sprays the gas in the gas distribution chamber into the combustion chamber through the gas swirl nozzle, and sprays the air in the air distribution chamber into the combustion chamber through the air swirl nozzle. On the one hand, it can meet the high-speed jet required for Moderate or Intense Low-oxygen Dilution (MILD) combustion; on the other hand, the swirling air in the combustion chamber has a long residence time and a fast flow rate, so it can be quickly heated and diluted by the high-temperature flue gas in the combustion chamber before participating in the reaction, realizing high-temperature preheated air and cooperating with the high-speed jet to entrain the high-temperature flue gas and dilute the air jet, making the oxygen concentration lower than a certain value and the temperature higher than the autoignition point of the fuel, and then realizing MILD combustion in the combustion chamber. In addition, the swirling gas sprayed through the gas swirl nozzle and the swirling air sprayed through the air nozzle collide and burn, making the gas and air in the combustion chamber mix more evenly and burn more fully, further reducing the emissions of CO and NOx, and making the high-temperature flue gas in the entire combustion chamber circulate strongly, and then fully diluting the sprayed gas and air, forming a lower oxygen concentration, reducing the combustion reaction rate, ensuring that the temperature in the combustion chamber is higher than the autoignition point of the fuel, making the heat flux distribution in the combustion chamber more uniform, and greatly enhancing the radiative heat transfer. In this way, the present invention realizes a specific and feasible burner with the function of high-temperature air combustion. Moreover, the structure of this burner frame can miniaturize the components for realizing high-temperature air combustion, making it have more application space and value. Coupled with low noise, full combustion, and small pollution of the exhaust gas, when applied to gas water heaters and related products and equipment such as gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for household bathing and heating, etc., it not only meets the requirements, but also brings the effects of full combustion and low pollutant emissions that the burners in existing water heaters do not have. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0033] Figure 1 It is a schematic structural diagram of an embodiment of the burner of the present invention;

[0034] Figure 2 is Figure 1 a partial structural diagram of the burner in;

[0035] Figure 3 is Figure 2 a sectional structural diagram along the A-A in;

[0036] Figure 4 is Figure 2Schematic top view structure diagram of the middle burner.

[0037] Explanation of the reference numerals in the drawings:

[0038] Label Name Label Name Label Name 10 Burner 122 Gas distribution chamber 500 Air swirl nozzle 100 Outer shell 123 Air distribution chamber 600 Central cylinder 110 Combustion chamber 200 Partition board 700 Enclosure board 111 Flue gas outlet 300 Preheating combustion device 710 Cylinder part 120 Gas distribution chamber 310 Preheating burner 720 Convex part 121 Premixing chamber 400 Gas swirl nozzle

[0039] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0040] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B simultaneously.

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0043] The object of the present invention is to utilize the characteristics of high-temperature air combustion to design a new type of burner and apply it to gas water heaters, so that the gas water heaters can effectively reduce the emissions of CO and NOx and reduce the noise of the gas water heaters.

[0044] The present invention provides a burner, which is applicable to gas water heaters and related products and equipment such as gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for household bathing, heating, etc. For the convenience of understanding below, the application to a gas water heater is taken as an example.

[0045] In the embodiments of the present invention, as Figures 1 to 4As shown in the figure, the burner 10 includes a housing 100, a partition 200, a preheating combustion device 300, a gas swirl nozzle 400 and / or an air swirl nozzle 500. The partition 200 is installed inside the housing 100 and is used to divide the inner cavity of the housing 100 into a combustion chamber 110 and a gas distribution chamber 120, and a high-temperature air combustion reaction takes place in the combustion chamber 110. The combustion chamber 110 has a flue gas outlet 111, and the gas distribution chamber 120 is formed with an independent premixing chamber 121, a gas distribution chamber 122 and an air distribution chamber 123. The premixing chamber 121 is used to premix the gas and air introduced into it. The preheating combustion device 300 is installed on the partition 200. The preheating combustion device 300 is used to ignite the mixed gas discharged from the premixing chamber 121 into the combustion chamber 110 and heat the temperature in the combustion chamber 110 to a preset temperature. The gas swirl nozzle 400 is installed on the partition 200 and is used to inject the gas flow in the gas distribution chamber 122 into the combustion chamber 110 in a swirling form; the air swirl nozzle 500 is installed on the partition 200 and is used to inject the air flow in the air distribution chamber 123 into the combustion chamber 110 in a swirling form.

[0046] The main characteristics of high-temperature air combustion are as follows: the chemical reaction mainly occurs in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than their natural temperature, and the maximum temperature rise during the combustion process is lower than their natural temperature. The volume fraction of oxygen is diluted to a very low concentration by the combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire furnace is very uniform, the combustion peak temperature is low, the noise is extremely small, and the emissions of pollutants NOx and CO are greatly reduced. However, certain conditions are required to achieve high-temperature air combustion: it is necessary to ensure that the oxygen concentration at any position in the furnace is lower than a certain value, generally lower than 5% - 10%, to ensure that the gas is fully decomposed and burned evenly, and the temperature should be higher than the autoignition point of the fuel to maintain autoignition.

[0047] In this embodiment, the shape of the outer shell 100 can be selected and designed according to actual usage requirements, such as cylindrical, square, irregular, etc. The partition 200 and the outer shell 100 can be integrally formed, or can be fixedly or detachably connected within the outer shell 100. There is a cavity within the outer shell 100, and the partition 200 divides the inner cavity of the outer shell 100 into a combustion chamber 110 and a gas distribution chamber 120. A plate-like structure can be provided within the outer shell 100 to divide the gas distribution chamber 120 into independent premixing chamber 121, gas distribution chamber 122, and air distribution chamber 123. The specific arrangement of the premixing chamber 121, gas distribution chamber 122, and air distribution chamber 123 can be selected and designed according to actual requirements, and no specific limitation is made here. The premixing chamber 121 is used for premixing the gas and air introduced therein. In order to make the combustion more complete, the gas entering the intake port of the premixing chamber 121 can be the mixed gas of the gas and air after being mixed by the premixer. In one embodiment, in order to better obtain the mixed gas of gas and air, the premixer includes a casing, a blower, and a gas switch valve. The casing is formed with an air inlet duct, a gas flow channel, and a mixing channel. The mixing channel is respectively communicated with the air inlet duct and the gas flow channel. The blower is arranged in the air inlet duct, and the gas switch valve is arranged in the gas flow channel. The mixing channel is communicated with the intake port of the mixed gas distribution chamber 120. Then when the mixed gas is needed, the blower is controlled to operate and the gas switch valve is controlled to open according to the pre-set air and gas ratio to mix a mixed gas with a certain gas / air ratio within the casing.

[0048] The gas in the gas distribution chamber 122 can be controlled by an external gas valve. Air can be blown into the air distribution chamber 123 by an external blower, and the air in the air distribution chamber 123 can be controlled by controlling the rotation speed of the blower. It can be understood that since there is a certain air pressure when the gas valve is opened, the gas in the gas distribution chamber 122 can be sprayed from the gas swirl nozzle 400 into the combustion chamber 110, and the spraying flow rate of the gas swirl nozzle 400 reaches the requirement. And since the blower has a certain air pressure, the air in the air distribution chamber 123 can be sprayed from the air swirl nozzle 500 into the combustion chamber 110, and the spraying flow rate of the air swirl nozzle 500 reaches the requirement.

[0049] The number of the gas swirl nozzles 400 and the air swirl nozzles 500 can specifically be one, two, three, four, five, etc. In one embodiment, the number of the gas swirl nozzles 400 and the air swirl nozzles 500 is multiple. The multiple gas swirl nozzles 400 are arranged at intervals along the circumferential direction of the partition plate 200, and the multiple air swirl nozzles 500 are arranged at intervals along the circumferential direction of the partition plate 200. By arranging the multiple gas swirl nozzles 400 and the air swirl nozzles 500 arranged at intervals along the circumferential direction of the partition plate 200, multiple swirls can be formed in the combustion chamber 110. Thus, compared with one or two gas swirl nozzles 400 and air swirl nozzles 500, at the same injection flow rate, the swirls ejected from the gas swirl nozzles 400 and the air swirl nozzles 500 can rotate faster, more stably and lastingly in the combustion chamber 110.

[0050] Specifically, one end of the gas swirl nozzle 400 is installed on the partition plate 200 and communicated with the gas distribution chamber 122, and the other end is arranged in the combustion chamber 110 and is arranged at an angle with the partition plate 200. The projection line of the gas swirl nozzle 400 on the partition plate 200 is arranged at an angle with the connection line between the center of the partition plate 200 and the root of the gas swirl nozzle 400. One end of the air swirl nozzle 500 is installed on the partition plate 200 and communicated with the air distribution chamber 123, and the other end is arranged in the combustion chamber 110 and is arranged at an angle with the partition plate 200. The projection line of the air swirl nozzle 500 on the partition plate 200 is arranged at an angle with the connection line between the center of the partition plate 200 and the root of the air swirl nozzle 500. It should be noted that since the gas swirl nozzle 400 and the air swirl nozzle 500 are installed on the partition plate 200, each swirl nozzle has an intersection point with the partition plate 200, and the root of the swirl nozzle refers to this intersection point.

[0051] The number of the gas swirl nozzles 400 can be the same as or different from the number of the air swirl nozzles 500. The gas swirl nozzles 400 and the air swirl nozzles 500 are both installed on the partition plate 200. One end of the gas swirl nozzle 400 is communicated with the gas distribution chamber 122, and the other end protrudes from the partition plate 200 and is arranged in the combustion chamber 110. The gas swirl nozzle 400 is arranged at an angle with the partition plate 200, and the projection line of the gas swirl nozzle 400 on the partition plate 200 is arranged at an angle with the connection line between the center of the partition plate 200 and the root of the gas swirl nozzle 400. Then when the gas is ejected from the gas swirl nozzle 400, a swirl is formed in the combustion chamber 110. When the multiple gas swirl nozzles 400 are arranged at intervals along the circumferential direction of the partition plate 200, the gas ejected from the gas swirl nozzles 400 forms multiple swirls in the combustion chamber 110. It can be understood that the angles between the multiple gas swirl nozzles 400 and the partition plate 200 can be the same or different. And the angles between the multiple gas swirl nozzles 400 and the radial direction of the projection of the gas swirl nozzle 400 can be the same or different.

[0052] One end of the air swirl nozzle 500 communicates with the air distribution chamber 123, and the other end protrudes from the partition plate 200 and is arranged inside the combustion chamber 110. The air swirl nozzle 500 is arranged at an angle with the partition plate 200, and the projection line of the extending direction of the air swirl nozzle 500 on the partition plate 200 is arranged at an angle with the connection line between the center of the partition plate 200 and the root of the air swirl nozzle 500. Then, when air is ejected from the air swirl nozzle 500, a swirl is formed inside the combustion chamber 110. When multiple air swirl nozzles 500 are arranged at intervals along the circumferential direction of the partition plate 200, multiple swirls of air are formed inside the combustion chamber 110 from the air ejected from the air swirl nozzles 500. It can be understood that the angles between the multiple air swirl nozzles 500 and the partition plate 200 can be the same or different. And the angles between the multiple air swirl nozzles 500 and the radial direction of the projection of the air swirl nozzle 500 can be the same or different.

[0053] It should be noted that before high-temperature air combustion (MILD combustion) is carried out inside the combustion chamber 110, the combustion chamber 110 needs to be preheated to a preset temperature first. Then, a preheating combustion device 300 is installed on the partition plate 200, so that the air inlet end of the preheating combustion device 300 communicates with the premixing chamber 121, and the air outlet end communicates with the combustion chamber 110. The preheating combustion device 300 can be a combustion nozzle or a burner. The preheating combustion device 300 is ignited by an ignition device, and the mixed gas discharged from the premixing chamber 121 into the combustion chamber 110 is ignited. The high-temperature flue gas enters the combustion chamber 110 to heat the combustion chamber 110. When the temperature inside the combustion chamber 110 exceeds the spontaneous combustion temperature of the fuel gas. At this time, the air swirl nozzle 500 and the fuel gas swirl nozzle 400 can be opened. The swirling air is quickly heated to the temperature required for MILD combustion under the action of the high-temperature flue gas, and the oxygen concentration inside the combustion chamber 110 is quickly diluted evenly to be lower than a certain value. Subsequently, the fuel gas ejected from the fuel gas swirl nozzle 400 is ignited, entraining the high-temperature flue gas and diluting the air jet ejected from the air swirl nozzle 500, and making the temperature higher than the spontaneous combustion point of the fuel gas, so as to maintain the MILD combustion of the combustion chamber 110.

[0054] The burner 10 of the present invention injects the gas in the gas distribution chamber 122 into the combustion chamber 110 through the gas swirl nozzle 400, and the air in the air distribution chamber 123 is injected into the combustion chamber 110 through the air swirl nozzle 500. On the one hand, it can meet the high-speed jet required for high-temperature air combustion (MILD combustion); on the other hand, the swirling air in the combustion chamber 110 has a long residence time and a fast flow rate, so that it can be quickly heated and diluted by the high-temperature flue gas in the combustion chamber 110 before participating in the reaction, realizing high-temperature preheated air and cooperating with the high-speed jet to entrain the high-temperature flue gas and dilute the air jet, so that the oxygen concentration is lower than a certain value and the temperature is higher than the autoignition point of the fuel, and then MILD combustion is realized in the combustion chamber 110. In addition, the swirling gas injected through the gas swirl nozzle 400 and the swirling air injected through the air nozzle collide and burn, making the gas and air in the combustion chamber 110 mix more evenly and burn more fully, further reducing the emissions of CO and NOx, and making the high-temperature flue gas in the entire combustion chamber 110 circulate strongly, and then fully diluting the injected gas and air, forming a lower oxygen concentration, reducing the combustion reaction rate, ensuring that the temperature in the combustion chamber 110 is higher than the autoignition point of the fuel, making the heat flux distribution in the combustion chamber 110 more uniform, and greatly enhancing the radiative heat transfer. That is to say, the technical solution of this embodiment is beneficial to simultaneously meeting these two conditions and successfully realizing high-temperature air combustion. And, the structure of this burner frame can miniaturize the components for realizing high-temperature air combustion, making it have more application space and value. Coupled with low noise, full combustion, and small pollution of the exhaust gas, when applied to gas water heaters and related products and equipment such as gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for household bathing and heating, etc., it not only meets the requirements, but also brings the effects of full combustion and low pollutant emissions that the burners in existing water heaters do not have.

[0055] In one embodiment, as Figure 4 shown, the included angle (such as Figure 4 α in

[0056] between the projection line of the gas swirl nozzle 400 on the partition plate 200 and the connection line between the center of the partition plate 200 and the root of the gas swirl nozzle 400) is greater than or equal to 30 degrees and less than or equal to 150 degrees. Specifically, the included angle between the projection line of the gas swirl nozzle 400 on the partition plate 200 and the connection line between the center of the partition plate 200 and the root of the gas swirl nozzle 400 can be 30 degrees, 45 degrees, 56 degrees, 60 degrees, 75 degrees, 83 degrees, 90 degrees, 100 degrees, 115 degrees, 130 degrees, 150 degrees, etc.

[0056] In this embodiment, for ease of understanding, the line connecting the root of the gas swirl nozzle 400 and the center of the partition 200 is referred to as the projection radial direction of the gas swirl nozzle 400. Definition: When the angle between the projection line of the gas swirl nozzle 400 on the partition 200 and the projection radial direction of the gas swirl nozzle 400 is equal to 0, the outflow direction of the gas swirl nozzle 400 is perpendicular and away from the central axis of the partition 200. When the angle between the projection line of the gas swirl nozzle 400 on the partition 200 and the projection radial direction of the swirl nozzle is equal to 180, the outflow direction of the gas swirl nozzle 400 is perpendicular and toward the central axis of the partition 200. Then, when the angle between the projection line of the gas swirl nozzle 400 on the partition 200 and the projection radial direction of the swirl nozzle is less than 30 degrees, the gas swirl nozzle 400 is set away from the centerline axis of the partition 200, but the angle of the gas swirl nozzle 400 deviating from the projection radial direction is too small, so it is not easy to form an effective and stable swirl in the combustion chamber 110. When the angle between the projection line of the gas swirl nozzle 400 on the partition 200 and the radial projection of the swirl nozzle is greater than 150 degrees, the gas swirl nozzle 400 is ejected toward the central axis of the partition 200, so that the overall swirl effect is not good. By making the angle between the projection line of the extension direction of the gas swirl nozzle 400 on the partition 200 and the radial projection of the swirl nozzle greater than or equal to 30 degrees and less than or equal to 150 degrees, the gas flow ejected by the gas swirl nozzle 400 can stably form a swirl in the combustion chamber 110.

[0057] In another embodiment, if Figure 2 As shown, the angle between the projection line of the air swirl nozzle 500 on the partition 200 and the line connecting the center of the partition 200 and the root of the air swirl nozzle 500 (as shown in FIG. Figure 4 α in the figure is greater than or equal to 30 degrees and less than or equal to 150 degrees. Specifically, the angle between the projection line of the air swirl nozzle 500 on the baffle 200 and the line connecting the center of the baffle 200 and the root of the air swirl nozzle 500 can be 30 degrees, 45 degrees, 56 degrees, 60 degrees, 75 degrees, 83 degrees, 90 degrees, 100 degrees, 115 degrees, 130 degrees, 150 degrees, etc. For ease of understanding, the line connecting the root of the air swirl nozzle 500 and the center of the baffle 200 is referred to as the projection radial direction of the air swirl nozzle 500. By making the angle between the projection line of the air swirl nozzle 500 on the baffle 200 and the projection radial direction of the air swirl nozzle 500 greater than or equal to 30 degrees and less than or equal to 150 degrees, the air flow ejected by the air swirl nozzle 500 can stably form a swirl in the combustion chamber 110.

[0058] In order to further increase the swirl diameter of the swirl in the combustion chamber 110 and achieve a better mixing effect of the swirl in the combustion chamber 110, the outflow direction of the gas swirl nozzle 400 and the outflow direction of the air swirl nozzle 500 are both arranged away from the central axis of the partition plate 200. In one embodiment, Figure 2 As shown, the included angle between the gas swirl nozzle 400 and the partition plate 200 (as shown in FIG. Figure 2 β in β) is greater than or equal to 30 degrees and less than or equal to 80 degrees. Specifically, the angle between the gas swirl nozzle 400 and the partition plate 200 can be 30 degrees, 45 degrees, 60 degrees, 75 degrees, 80 degrees, etc.

[0059] In this embodiment, when the angle between the gas swirl nozzle 400 and the partition 200 is less than 30 degrees, the height of the gas swirl nozzle 400 away from the partition 200 is insufficient, so it is not easy to form a swirl above the partition 200, and the swirl cannot form a spiral upward flow form, and thus cannot form a swirl airflow in the entire combustion chamber 110. When the angle between the gas swirl nozzle 400 and the partition 200 is greater than 80 degrees, the outflow direction of the gas swirl nozzle 400 is close to perpendicular to the partition 200, so that the swirl cannot be effectively and stably formed. By making the angle between the gas swirl nozzle 400 and the partition 200 greater than or equal to 30 degrees and less than or equal to 80 degrees, while ensuring that the swirl nozzle sprays a stable and effective swirl, the swirl forms a spiral upward flow form in the combustion chamber 110, and then can flow in the entire combustion chamber 110, further increasing the gas mixing effect and improving the combustion effect.

[0060] In another embodiment, the angle between the air swirl nozzle 500 and the partition plate 200 (eg Figure 2 β in the figure is greater than or equal to 30 degrees and less than or equal to 80 degrees. Specifically, the angle between the air swirl nozzle 500 and the baffle 200 can be 30 degrees, 45 degrees, 60 degrees, 75 degrees, 80 degrees, etc. By making the angle between the air swirl nozzle 500 and the baffle 200 greater than or equal to 30 degrees and less than or equal to 80 degrees, while ensuring that the swirl nozzle sprays a stable and effective swirl, the swirl forms a spiral upward flow form in the combustion chamber 110, and then can flow in the entire combustion chamber 110, further increasing the gas mixing effect and improving the combustion effect.

[0061] In practical applications, such as Figures 1 to 3As shown, the burner 10 further includes a central cylinder 600 installed in the gas distribution chamber 120. A premixing chamber 121 communicating with the combustion chamber 110 is formed inside the central cylinder 600. Further, the burner 10 further includes an enclosing plate 700 installed in the gas distribution chamber 120. The enclosing plate 700 surrounds the periphery of the central cylinder 600. One of the gas distribution chamber 122 and the air distribution chamber 123 is defined between the central cylinder 600 and the enclosing plate 700, and the other of the gas distribution chamber 122 and the air distribution chamber 123 is defined between the enclosing plate 700 and the outer shell 100.

[0062] In this embodiment, the inner wall surface of the enclosing plate 700, the outer wall surface of the central cylinder 600, and the bottom wall surface of the partition plate 200 and the outer shell 100 together enclose to form the gas distribution chamber 122 / air distribution chamber 123. The outer wall surface of the enclosing plate 700, the partition plate 200, and the inner wall surface of the housing together enclose to form the air distribution chamber 123 / gas distribution chamber 122. By means of the central cylinder 600 plus the enclosing plate 700, the gas distribution chamber 120 is divided into the premixing chamber 121, the gas distribution chamber 122, and the air distribution chamber 123. On the one hand, the premixing chamber 121, the gas distribution chamber 122, and the air distribution chamber 123 can all be directly communicated with the combustion chamber 110, shortening the communication path, simplifying the overall structure, and being easy to form and manufacture. On the other hand, the distribution of the burner 10 in terms of height and width is more reasonable, so that the burner 10 has a simple and compact structure, occupies a small space, and has a beautiful appearance.

[0063] On the basis of the above embodiment, further, as Figure 2 shown, the enclosing plate 700 includes a cylindrical part 710 and a plurality of convex parts 720 connected to each other. The plurality of convex parts 720 are arranged at intervals along the circumferential direction of the cylindrical part 710. The distance between the convex part 720 and the central cylinder 600 is greater than the distance between the cylindrical part 710 and the central cylinder 600.

[0064] In this embodiment, the shroud 700 is composed of a cylindrical part 710 and a convex part 720. The cylindrical part 710 is arranged in a substantially cylindrical shape, and multiple cylindrical parts 710 are arranged at intervals along the circumferential direction. A convex part 720 is connected between two adjacent cylindrical parts 710, so that the cylindrical part 710 and the convex part 720 jointly enclose the outer periphery of the central cylinder 600. It can be understood that if only the cylindrical shroud 700 encloses the outer periphery of the central cylinder 600, the volume of the chamber defined between the shroud 700 and the central cylinder 600 is smaller than the volume of the chamber defined between the shroud 700 and the outer shell 100. Thus, the volume difference between the gas distribution chamber 122 and the air distribution chamber 123 is too large. By making the shroud 700 composed of the cylindrical part 710 and the convex part 720, and the distance between the convex part 720 and the central cylinder 600 is greater than the distance between the cylindrical part 710 and the central cylinder 600, the volume of the chamber defined between the shroud 700 and the central cylinder 600 is enlarged, so that the volume difference between the air distribution chamber 123 and the gas distribution chamber 122 is smaller. As a result, the jet velocity of the air swirl nozzle 500 and the jet velocity of the gas swirl nozzle 400 differ less, and further, the mixing effect of the air swirl and the gas swirl in the combustion chamber 110 is better.

[0065] In the above embodiment where the combined partition 200 includes the cylindrical part 710 and the convex part 720, further, please refer to Figure 1 and Figure 2 simultaneously. An air distribution chamber 123 is defined between the cylindrical part 710, the convex part 720 and the central cylinder 600, and a gas distribution chamber 122 is defined between the cylindrical part 710, the convex part 720 and the outer shell 100. An air swirl nozzle 500 is arranged at a position of the partition 200 corresponding to a convex part 720, and multiple air swirl nozzles 500 and multiple gas swirl nozzles 400 are arranged in a circular pattern.

[0066] In this embodiment, by arranging the air swirl nozzle 500 at a position of the partition 200 corresponding to the convex part 720, the air swirl nozzle 500 and the gas swirl nozzle 400 can be arranged on the same circumference. In this way, the swirling air ejected from the air swirl nozzle 500 and the swirling gas ejected from the gas swirl nozzle 400 can be mixed in the first time, and then a spiral rising air flow is formed, realizing uniform and stable combustion in the entire combustion chamber 110. In other embodiments, the air swirl nozzle 500 and the gas swirl nozzle 400 may not be arranged on the same circumference.

[0067] In one embodiment, as Figure 1 and Figure 2As shown, the preheating combustion device 300 includes a preheating burner 310. The intake port of the preheating burner 310 is communicated with the premixing chamber 121, and the outlet port is arranged in the combustion chamber 110. It can be understood that the preheating burner 310 can burn the mixed gas entering it from the premixing chamber 121 and discharge the high-temperature flue gas after combustion into the combustion chamber 110 to preheat the combustion chamber 110. Specifically, an ignition device is arranged at a position adjacent to the preheating burner 310 for igniting the preheating burner 310. By using the preheating burner 310 to preheat the combustion chamber 110 through combustion, the structure is simple, the occupied space is small, and the preheating effect is good.

[0068] In the above embodiment where the number of the gas swirl nozzles 400 and the air swirl nozzles 500 is multiple, further, an air swirl nozzle 500 is arranged between two adjacent gas swirl nozzles 400. That is, in the circumferential direction of the partition plate 200, the gas swirl nozzles 400 and the air swirl nozzles 500 are arranged alternately. In this way, an air swirl is sandwiched between every two gas swirls, which is more conducive to the mixing of the gas flow and the air flow and improves the MILD combustion efficiency in the combustion chamber 110. Specifically, if the number of the gas swirl nozzles 400 and the air swirl nozzles 500 is both three, then the three gas swirl nozzles 400 and the three air swirl nozzles 500 are arranged alternately. This makes the overall layout reasonable and reduces the number of the gas swirl nozzles 400 and the air swirl nozzles 500 while meeting the mixing effect. In other embodiments, the gas swirl nozzles 400 and the air swirl nozzles 500 may also be arranged without intervals.

[0069] In one embodiment, the swirl directions of the multiple gas swirl nozzles 400 are the same, the swirl directions of the multiple air swirl nozzles 500 are the same, and the swirl direction of the gas swirl nozzles 400 is opposite to that of the air swirl nozzles 500.

[0070] In this embodiment, the swirling directions of the multiple gas swirling nozzles 400 are the same, which means that the swirling directions of the multiple gas swirling nozzles 400 are all clockwise or counterclockwise. The swirling directions of the multiple air swirling nozzles 500 are the same, which means that the swirling directions of the multiple air swirling nozzles 500 are all clockwise or counterclockwise. Since the swirling directions of the multiple air swirling nozzles 500 are the same and the swirling directions of the multiple gas swirling nozzles 400 are the same, all the gas airflows can form swirls in the same direction, and all the air airflows can form swirls in the same direction, making the airflow distribution more reasonable and facilitating the formation of a spiral upward flow pattern, thereby ensuring uniform mixing of the airflows throughout the combustion chamber 110. By making the swirling directions of the multiple gas swirling nozzles 400 opposite to those of the multiple air swirling nozzles 500, two counter-rotating swirls are formed by the gas swirl and the air swirl. As a result, the mixing of gas and air is more uniform, and thus rapid preheating of air and dilution of oxygen concentration can be achieved. Combining with the entrainment effect of gas, the entire MILD combustion becomes more complete and the combustion effect is better. Combining with the above embodiment in which one air swirling nozzle 500 is arranged between two adjacent gas swirling nozzles 400, one air swirl is formed to counter-cross between every two gas swirls, so that two counter-rotating swirls are formed throughout the combustion chamber 110, making the mixing of gas and air more uniform, the heat flow distribution more uniform, the reaction rate reduced, the combustion slower and more sustainable, further reducing the emissions of carbon monoxide and nitrogen oxides, and effectively reducing noise at the same time.

[0071] In another embodiment, please refer to Figure 4 , the swirling directions of the multiple gas swirling nozzles 400 are the same as those of the multiple air swirling nozzles 500. By making the swirling directions of the multiple gas swirling nozzles 400 and the air swirling nozzles 500 the same, the air swirl and the gas swirl form a swirling airflow in the same direction, and the swirling airflow is more stable and the rotation upward rate is faster, so that the swirling airflow can spiral upward to the entire combustion chamber 110, and thus the combustion in the entire combustion chamber 110 becomes more complete and uniform, effectively improving the combustion efficiency.

[0072] The present invention also provides a gas water heater, including a main body, a heat exchanger and a burner 10. A heat exchange chamber and an exhaust port communicating with the heat exchanger are arranged in the main body. The heat exchanger is arranged in the heat exchange chamber, and the flue gas outlet 111 of the burner 10 communicates with the heat exchange chamber. It should be noted that the gas in the gas distribution chamber 122 can be provided through an external gas pipeline, and a gas proportional valve is arranged on the gas pipeline for control. The air in the air distribution chamber 123 can be controlled by an independent blower, and this blower is independent of the blower of the premixer.

[0073] For the detailed structure of the burner 10, reference may be made to the embodiments of the burner 10 described above, which will not be elaborated herein; it can be understood that since the above-mentioned burner 10 is used in the gas water heater of the present invention, therefore, the embodiments of the gas water heater of the present invention include all the technical solutions of all the embodiments of the above-mentioned burner 10, and the achieved technical effects are also exactly the same, which will not be elaborated herein.

[0074] Combined with the embodiments of the above-mentioned burner 10, the working principle of the burner 10 of the present invention applied to a gas water heater is described as follows:

[0075] When the water heater is started, the gas switch valve of the premixer and the blower supply the air and gas mixed in a certain proportion to the premixing chamber 121. The preheating combustion device 300 is ignited by the ignition device, and the mixed gas discharged from the premixing chamber 121 into the combustion chamber 110 is ignited. The high-temperature flue gas enters the combustion chamber 110 to heat the combustion chamber 110. When the temperature in the combustion chamber 110 exceeds the self-ignition temperature of the gas. At this time, the air swirl nozzle 500 and the gas swirl nozzle 400 can be opened. The swirl air is quickly heated to the temperature required for MILD combustion under the action of the high-temperature flue gas, and the oxygen concentration in the combustion chamber 110 is quickly diluted evenly to be lower than a certain value. Subsequently, the gas ejected from the gas swirl nozzle 400 is ignited, entraining the high-temperature flue gas and diluting the air jet ejected from the air swirl nozzle 500, and making the temperature higher than the self-ignition point of the gas, so as to maintain the MILD combustion in the combustion chamber 110. In this way, this embodiment meets the conditions of high-temperature air combustion (MILD combustion): preheating the high-temperature air and cooperating with the high-speed jet to entrain the high-temperature flue gas and dilute the ignited gas jet, making the oxygen concentration lower than a certain value, and the temperature higher than the self-ignition point of the fuel. The heat after combustion can be exchanged with the heat exchanger of the gas water heater and then discharged outdoors to obtain hot water.

[0076] It can be understood that since the burner 10 is adopted in the gas water heater, the gas water heater can effectively reduce the emissions of CO and NOx and reduce the noise of the gas water heater.

[0077] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A burner, characterized in that, Comprising: A housing; A partition plate, installed inside the housing and used to divide the inner cavity of the housing into a combustion chamber and a gas distribution chamber. A high-temperature air combustion reaction occurs in the combustion chamber. The combustion chamber has a flue gas outlet. The gas distribution chamber is formed with an independent premixing chamber, a gas distribution chamber, and an air distribution chamber. The premixing chamber is used to premix the gas and air introduced into it; A preheating combustion device, installed on the partition plate. The preheating combustion device is used to ignite the mixed gas discharged from the premixing chamber into the combustion chamber and heat the temperature in the combustion chamber to a preset temperature; A gas swirl nozzle, installed on the partition plate. One end of the gas swirl nozzle is communicated with the gas distribution chamber, and the other end protrudes from the partition plate and is arranged in the combustion chamber, and is used to inject the airflow in the gas distribution chamber into the combustion chamber in a swirling form; And / or An air swirl nozzle, installed on the partition plate. One end of the air swirl nozzle is communicated with the air distribution chamber, and the other end protrudes from the partition plate and is arranged in the combustion chamber, and is used to inject the airflow in the air distribution chamber into the combustion chamber in a swirling form; The burner further includes a central cylinder and a shroud installed in the gas distribution chamber. A premixing chamber communicated with the combustion chamber is formed inside the central cylinder. The shroud surrounds the periphery of the central cylinder. One of the gas distribution chamber and the air distribution chamber is defined between the central cylinder and the shroud, and the other of the gas distribution chamber and the air distribution chamber is defined between the shroud and the housing; The shroud includes a cylindrical part and a plurality of convex parts connected to each other. The plurality of convex parts are arranged at intervals along the circumferential direction of the cylindrical part. The distance between the convex part and the central cylinder is greater than the distance between the cylindrical part and the central cylinder.

2. The burner according to claim 1, characterized in that, An air distribution chamber is defined between the cylindrical part, the convex part and the central cylinder, and a gas distribution chamber is defined between the cylindrical part, the convex part and the housing. An air swirl nozzle is arranged at the position of the partition plate corresponding to one convex part. The plurality of air swirl nozzles and the plurality of gas swirl nozzles are arranged in a circular pattern.

3. The burner according to claim 1 or 2, characterized in that, The number of the gas swirl nozzles and the air swirl nozzles is multiple. The plurality of gas swirl nozzles are arranged at intervals along the circumferential direction of the partition plate, and the plurality of air swirl nozzles are arranged at intervals along the circumferential direction of the partition plate.

4. The burner according to claim 3, characterized in that, One air swirl nozzle is arranged between two adjacent gas swirl nozzles.

5. The burner according to claim 4, characterized in that, The swirl directions of the plurality of gas swirl nozzles are the same, the swirl directions of the plurality of air swirl nozzles are the same, and the swirl direction of the gas swirl nozzle is opposite to the swirl direction of the air swirl nozzle.

6. The burner according to claim 4, characterized in that, The swirl directions of the plurality of gas swirl nozzles and the plurality of air swirl nozzles are the same.

7. The burner according to claim 1, characterized in that, The preheating combustion device includes a preheating burner. The intake port of the preheating burner is communicated with the premixing chamber, and the outlet port is arranged in the combustion chamber.

8. A gas water heater, characterized in that, Comprising a main body, a heat exchanger and the burner according to any one of claims 1 to 7. A heat exchange chamber and a smoke exhaust port communicated with the heat exchange chamber are arranged inside the main body. The heat exchanger is arranged in the heat exchange chamber. The flue gas outlet of the burner is communicated with the heat exchange chamber.

Images