Lower-blower gas water heater

Abstract

Disclosed in the present invention is a lower-blower gas water heater, comprising a housing, a heat exchanger, a burner and an air blower. The burner comprises a housing and a plurality of rich-lean burner rows; a plurality of first air inlets and a plurality of second air inlets are provided on one side of the housing; vents are provided at the bottom of the housing; a first ejection tube and a second ejection tube are provided on one side of each burner row; a rich flame flow channel and a lean flame flow channel are provided in each burner row; each lean flame flow channel comprises a plurality of first air supply channels and a plurality of second air supply channels, the second air supply channels being distributed on two sides of each first air supply channel; each lean flame flow channel is configured such that the airflow resistance generated by the first air supply channels is greater than the airflow resistance generated by the second air supply channel; each second injection tube is provided with a plurality of air outlet holes, and leads to the rich flame flow channel by means of the plurality of air outlet holes; the areas of the plurality of air outlet holes tend to increase in the air flow direction in the second injection tube. The flame stabilization effect is optimized to improve flame combustion stability and reduce combustion noise.

Description

Down-draft gas water heater Technical Field

[0001] This invention belongs to the field of household appliance technology, and in particular relates to a bottom-drum type gas water heater. Background Technology

[0002] Water heaters are currently common household appliances. They are categorized into gas water heaters and electric water heaters, with gas water heaters being widely used due to their convenience. A typical gas water heater usually consists of components such as a fan, burner, combustion chamber, and heat exchanger. The burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger.

[0003] The burner is a crucial component of a gas water heater, and the burner itself is a vital part of the burner. To reduce the NOx emissions generated during combustion, concentrated and dilute burners are increasingly being used. For example, Chinese Patent Publication No. CN 209371249U discloses a concentrated and dilute burner equipped with two ejector tubes (a concentrated flame ejector tube and a dilute flame ejector tube). During use, the airflow velocity introduced by the two ejector tubes changes, resulting in a change in the mixing airflow velocity ratio between the concentrated and dilute flame holes. This significantly reduces the flame stabilization effect of the concentrated flame on the dilute flame, easily leading to flame detachment or unstable combustion, resulting in noticeable combustion noise. Technical issues

[0004] Therefore, the technical problem to be solved by this invention is how to design a technology to optimize flame stabilization to improve flame combustion stability and reduce combustion noise. Technical solutions

[0005] This invention provides a bottom-drum type gas water heater that optimizes flame stabilization to improve flame combustion stability and reduce combustion noise.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In one aspect, the present invention provides a bottom-drum type gas water heater, comprising:

[0008] The casing is also equipped with an inlet pipe and an outlet pipe;

[0009] A heat exchanger having heat exchange channels formed therein;

[0010] A burner includes a housing and multiple enrichment / lean flame channels. The housing has multiple first air inlets and multiple second air inlets on one side, and a vent at the bottom. Each flame channel has a first ejector tube and a second ejector tube on one side. The flame channel contains enrichment flame channels and lean flame channels. The lean flame channels include multiple first air supply channels and multiple second air supply channels. The second air supply channels are distributed on both sides of the first air supply channels. The lean flame channels are configured such that the airflow resistance generated by the first air supply channels is greater than the airflow resistance generated by the second air supply channels. The first ejector tubes connect to both the first and second air supply channels. The second ejector tubes have multiple air outlets that connect to the enrichment flame channels. The opening area of ​​the multiple air outlets increases along the airflow direction in the second ejector tube.

[0011] Fan;

[0012] The heat exchanger, the burner, and the fan are disposed in the casing. The burner is arranged above the heat exchanger. The air outlet of the fan is connected to the ventilation port of the casing. The heat exchange channel is connected between the water inlet pipe and the water outlet pipe.

[0013] In one embodiment of this application, the concentration / diluted heat exchanger includes:

[0014] The main body of the fire duct is provided with a first ejector tube and a second ejector tube. The main body of the fire duct is also provided with a distribution channel and an installation port. The installation port, the distribution channel and the first ejector tube are connected in sequence. The tail end of the second ejector tube forms an exhaust section. The exhaust section is provided with a plurality of exhaust holes.

[0015] A side cover plate is disposed on the main body of the fire briquette and covers the air outlet. A dense flame channel is formed between the side cover plate and the main body of the fire briquette, and the dense flame channel is provided with a dense flame port.

[0016] A light flame assembly includes two outer flame plates and two inner flame plates. The inner flame plates are located between the two outer flame plates. A plurality of first air supply channels are formed between the two inner flame plates. A plurality of second air supply channels are formed between the outer flame plates and the adjacent inner flame plates. Both the first air supply channels and the second air supply channels are provided with light flame ports.

[0017] In one embodiment of this application, the plurality of air outlets are divided into at least one first through hole and at least one second through hole, wherein the opening area of ​​the first through hole is smaller than the opening area of ​​the second through hole.

[0018] The first through hole and the second through hole are arranged sequentially along the airflow direction in the second ejector tube.

[0019] In one embodiment of this application, the second through hole is a strip-shaped hole, which extends along the airflow direction in the second ejector tube;

[0020] Alternatively, each of the first through holes and each of the second through holes may include a plurality of vent sub-holes; the number of vent sub-holes per unit area in the region where the first through hole is located is less than the number of vent sub-holes per unit area in the region where the second through hole is located.

[0021] In one embodiment of this application, a plurality of vertical protrusions are further provided on the inner surface of the side cover plate, and the vertical protrusions abut against the main body of the fire briquette.

[0022] A gap is formed between two adjacent vertical protrusions.

[0023] In one embodiment of this application, at least two transverse protrusions are provided on the side cover plate, and each transverse protrusion is provided with a vertical protrusion at both ends;

[0024] The inner surface of the side cover plate is also provided with a flow guiding protrusion. The lower part of the flow guiding protrusion has an arc-shaped structure. The flow guiding protrusion is located below the interval formed between two adjacent transverse protrusions.

[0025] Along the airflow direction in the second ejector tube, the guide protrusion is also located obliquely above the outlet; the arc segment of the guide protrusion adjacent to the outlet is configured to guide the gas output from the outlet to flow in the opposite direction to the airflow in the second ejector tube.

[0026] The arc segment of the guide protrusion away from the outlet is configured to guide the gas output from the outlet to flow in the direction of the gas flow in the second ejector tube.

[0027] In one embodiment of this application, the number of light flame openings between the two inner flame plates is greater than the number of light flame openings between the outer flame plate and the adjacent inner flame plate;

[0028] And / or, the length of the first air supply channel is greater than the length of the second air supply channel.

[0029] In one embodiment of this application, the inner surface of the inner flame plate is provided with a plurality of protruding first molding portions, the first molding portions being strip-shaped and arranged vertically;

[0030] The first forming portion on one inner flame plate is attached to the first forming portion on another inner flame plate, and the two first forming portions attached to each other form a forming gap, and the two adjacent forming gaps form a first air supply channel between the two inner flame plates.

[0031] The inner surface of the outer flame plate is provided with a plurality of raised second molding parts. The second molding parts are strip-shaped and arranged vertically. Two adjacent second molding parts form a second air supply channel between the outer flame plate and the adjacent inner flame plate.

[0032] In one embodiment of this application, the inner surface of the inner flame plate is provided with a plurality of protruding flow-blocking molding portions;

[0033] The flow-blocking molding section is located between the two inner flame plates and is configured to increase the intake resistance between the two inner flame plates.

[0034] In one embodiment of this application, a secondary air duct is formed between two adjacent concentration-dilute combustors; a first overlap portion is formed at the end of the concentration-dilute combustor away from the ejector port of the first ejector tube, and a second overlap portion is formed at the end of the concentration-dilute combustor adjacent to the ejector port of the first ejector tube; an inclined limiting portion is formed between the first overlap portion and the bottom of the concentration-dilute combustor.

[0035] The bottom of the outer casing forms a bent surface, which has a first mounting surface, a second mounting surface, and a third mounting surface.

[0036] The first mounting surface is higher than the second mounting surface, the third mounting surface is higher than the second mounting surface, and the second mounting surface is located between the first mounting surface and the third mounting surface;

[0037] The ventilation opening includes a first sub-vent, a second sub-vent, and a third sub-vent. The first sub-vent is formed on the first mounting surface, the second sub-vent is formed on the second mounting surface, and the third sub-vent is formed on the third mounting surface.

[0038] The first overlapping portion is arranged above the first mounting surface, and the second overlapping portion is arranged above the third mounting surface. Beneficial effects

[0039] Compared with existing technologies, the beneficial effects include at least the following:

[0040] By forming multiple vent holes at the tail end of the second ejector tube, and with the vent hole opening area increasing along the airflow direction in the second ejector tube, the flow area of ​​the rich mixture is effectively increased, the flow resistance of the second ejector tube is reduced, and the flow rate of the rich mixture delivered to the rich flame nozzle is increased, thereby enhancing the stability of the rich flame over the lean flame. In actual use, it can effectively reduce the resistance encountered by the rich gas flow in the second ejector tube, increase the flow rate of the rich mixture, and ensure the flame stabilization capability of the rich flame. In addition, the vent hole area at the tail end of the second ejector tube is the largest, ensuring that the amount of rich mixture flowing to the tail end of the second ejector tube is sufficient, thereby ensuring that the amount of gas discharged from the rich flame nozzle at different positions of the rich and lean burner is uniform, and ensuring that the rich flame nozzle at each position can evenly and effectively hold the lean flame generated by the inner lean flame nozzle, thereby improving the combustion effect and achieving optimized flame stabilization to improve flame combustion stability. At the same time, since the occurrence rate of lean flame detachment is reduced, flame combustion stability can be ensured and combustion noise is reduced.

[0041] Meanwhile, by designing the number of inner light flame ports in the light flame assembly to be greater than the number of outer light flame ports, the airflow resistance of the inner light flame ports is increased. The overall increase in the number of light flame ports in the light flame assembly can, on the one hand, increase the resistance of the light flame ports and reduce the mixing air velocity in the high-speed zone where the inner light flame ports are located; on the other hand, it can reduce the mutual influence between adjacent light flame ports. The low flow velocity of the lean mixture in the inner adjacent light flame ports can further stabilize the outer light flame, reduce the occurrence of flame lift-off phenomenon in the outer light flame ports, improve the combustion effect, and achieve optimized flame stabilization to improve flame combustion stability. At the same time, since the occurrence rate of light flame lift-off is reduced, flame combustion stability can be ensured and combustion noise is reduced. Attached Figure Description

[0042] Figure 1 is a schematic diagram of one embodiment of the burner of the present invention;

[0043] Figure 2 is a second structural schematic diagram of an embodiment of the burner of the present invention;

[0044] Figure 3 is a schematic diagram of the structure of the thick and thin fire plate in Figure 1;

[0045] Figure 4 is an explosion diagram of the dense and light fireboxes in Figure 3;

[0046] Figure 5 is an exploded view of the light flame assembly in Figure 4;

[0047] Figure 6 is a schematic diagram of the outer shell in another embodiment of the burner of the present invention;

[0048] Figure 7 is a second schematic diagram of the outer shell structure in another embodiment of the burner of the present invention;

[0049] Figure 8 is a schematic diagram of the rich and lean burner structure in another embodiment of the burner of the present invention;

[0050] Figure 9 is a structural schematic diagram of an embodiment of the gas water heater of the present invention;

[0051] Figure 10 shows the CH4 airflow simulation distribution of the enrichment / diluted firebox of the present invention and the enrichment / diluted firebox of the prior art.

[0052] Figure label:

[0053] 1. Intensity and dilute flame grid; 11. Main body of the flame grid; 12. Side cover plate; 13. Dilute flame assembly; 14. First overlapping part; 15. Second overlapping part; 16. Inclined limiting part;

[0054] 111. First ejector tube; 112. Second ejector tube; 113. Distribution channel; 114. Mounting port;

[0055] 121. Vertical protrusion; 122. Horizontal protrusion; 123. Airflow guiding protrusion;

[0056] 131. Outer flame plate; 132. Inner flame plate; 133. First molding section; 134. Second molding section; 135. Flow-blocking molding section; 136. First mounting plate; 137. Second mounting plate;

[0057] 2. Outer casing; 21. First air inlet; 22. Second air inlet; 23. Ventilation opening; 24. Bending surface; 25. Mounting slot; 231. First sub-vent; 232. Second sub-vent; 233. Third sub-vent;

[0058] 241. First mounting surface; 242. Second mounting surface; 243. Third mounting surface. The best embodiment of the present invention

[0059] A gas water heater is a type of water heater that uses gas as its primary energy source. It produces hot water by transferring the high-temperature heat generated by the combustion of gas to cold water flowing through a heat exchanger.

[0060] Gas water heaters typically include an outer casing, as well as components such as a burner, heat exchanger, fan, and shroud housed within the casing.

[0061] In this process, the gas is delivered to the burner, where it is ignited by an ignition device, so that the burner can burn the delivered gas and generate heat.

[0062] The heat exchanger is equipped with heat exchange tubes. One end of the heat exchange tubes is connected to the water supply pipe, and the other end of the heat exchange tubes is connected to a shower head or faucet.

[0063] The heat generated by the burner burning the gas is used to heat the heat exchange tubes, thereby raising the temperature of the water inside the heat exchange tubes to form hot water.

[0064] When a gas water heater is working, cold water supplied by the water supply pipe flows into the heat exchange tube, and is then heated into hot water by the heat source generated by the burner. The hot water then flows out from the shower head or faucet through the hot water valve for the user's use.

[0065] At the same time, when the gas water heater is working, the fan is powered on and running simultaneously. Under the action of the fan, the flue gas generated by the burner is discharged outdoors.

[0066] As shown in Figures 1-5, an embodiment of this application provides a burner including a rich-lean combustor 1 and a housing 2, with multiple rich-lean combustors 1 installed in the housing 2.

[0067] The bright and dark flame grid 1 typically includes a main body 11, a side cover plate 12, and a light flame assembly 13.

[0068] The main body 11 of the fire briquette is provided with a first ejector tube 111 and a second ejector tube 112. The main body 11 of the fire briquette is also provided with a distribution channel 113 and a mounting port 114. The mounting port 114, the distribution channel 113 and the first ejector tube 111 are connected in sequence. The tail end of the second ejector tube 112 forms an air outlet. The air outlet is provided with a plurality of air outlet holes 1121. The opening area of ​​the plurality of air outlet holes 1121 tends to increase along the airflow direction in the second ejector tube 112. The side cover plate 12 is disposed on the main body 11 of the burner and covers the vent 1121. A dense flame flow channel is formed between the side cover plate 12 and the main body 11 of the burner, and the dense flame flow channel has a dense flame port. The light flame assembly 13 includes a plurality of light flame plates, which are arranged side by side. A light flame flow channel is formed between two adjacent light flame plates, and the light flame flow channel has a light flame port. The plurality of light flame plates are further divided into two outer flame plates 131 and two inner flame plates 132. The inner flame plates 132 are located between the two outer flame plates 131, and a plurality of light flame ports are formed between the two inner flame plates 132. A plurality of light flame ports are also formed between the outer flame plates 131 and the adjacent inner flame plates 132. The plurality of light flame plates are disposed in the mounting port 114.

[0069] To meet the air intake requirements of the concentration burner, the outer casing 2 is provided with multiple first air inlets 21 and multiple second air inlets 22. The first air inlets 21 can supply a lean mixture to the first ejector tube 111, and the second air inlets 22 can supply a rich mixture to the second ejector tube 112. The lean mixture supplied by the first ejector tube 111 is output at the lean flame port and combusted to form a lean flame, while the rich mixture supplied by the second ejector tube 112 is output at the rich flame port and combusted to form a rich flame.

[0070] To address the flame lift-off problem caused by the mismatch in airflow velocities and uneven gas distribution between the lean and rich gas mixtures in the rich-lean combustor 1, the following innovative structural design was implemented for the rich-lean combustor 1, which is explained below with reference to the attached drawings.

[0071] Example 1, as shown in Figures 1-5, in order to improve the gas flow rate and flow rate of the rich mixture, at least the following structural improvements are made to the second ejector tube 112.

[0072] The tail end of the second ejector tube 112 forms an air outlet, and the air outlet is provided with a plurality of air outlet holes 1121; the opening area of ​​the plurality of air outlet holes 1121 tends to increase along the airflow direction in the second ejector tube 112.

[0073] Specifically, the second ejector tube 112 is used to deliver a rich gas mixture. Typically, the diameter of the second ejector tube 112 is smaller than that of the first ejector tube 111, resulting in greater gas resistance within the second ejector tube 112. As the rich gas mixture flows through the second ejector tube 112, the airflow velocity and flow rate towards the tail end of the second ejector tube 112 will decrease, thus affecting the airflow velocity and flow rate of the rich gas mixture and reducing the flame stabilization capability of the rich flame.

[0074] By increasing the opening area of ​​multiple air outlets 1121 according to the airflow direction in the second ejector tube 112, the mixed gas delivered to the second ejector tube 112 will have its air resistance reduced as the opening area of ​​the air outlets 1121 gradually increases during the flow process, thus ensuring smooth delivery of the concentrated mixed gas at the tail of the second ejector tube 112.

[0075] As the opening area of ​​the multiple exhaust holes 1121 gradually increases along the airflow direction, the air resistance of the second ejector tube 112 is reduced, which is more conducive to increasing the intake volume and intake velocity. Furthermore, the increased opening area of ​​the multiple exhaust holes 1121 can ensure the uniform distribution of the rich mixture at different rich flame nozzles, thereby improving combustion stability.

[0076] By forming multiple air outlets 1121 at the tail of the second ejector tube 112, and by increasing the opening area of ​​the air outlets 1121 along the airflow direction in the second ejector tube 112, the flow area of ​​the rich mixture is effectively increased, the flow resistance of the second ejector tube 112 is reduced, and the flow rate of the rich mixture delivered to the rich flame nozzle is increased, thereby enhancing the stability of the rich flame over the lean flame. In actual use, the rich mixture delivered through the second ejector tube 112 can effectively reduce the resistance encountered by the rich gas during its flow in the second ejector tube 112, thus improving the rich mixture... The flow rate ensures the stability of the rich flame; in addition, the exhaust port 1121 at the tail of the second injector tube 112 has the largest area, ensuring that the amount of gas flowing from the rich mixture to the tail of the second injector tube 112 is sufficient, thereby ensuring that the gas output of the rich flame port at different positions of the rich-lean firebox 1 is evenly distributed, and ensuring that the rich flame port at each position can evenly and effectively hold the lean flame generated by the inner lean flame port, so as to improve the combustion effect, achieve optimized flame stabilization effect and improve the flame combustion stability; at the same time, since the occurrence rate of lean flame detachment is reduced, the flame combustion stability can be ensured and the combustion noise is reduced.

[0077] In one embodiment, in order to achieve an increasing trend in the opening area of ​​the plurality of air outlets 1121 along the airflow direction, the following structure can be adopted.

[0078] The plurality of air outlets 1121 are divided into at least one first through hole and at least one second through hole, wherein the opening area of ​​the first through hole is smaller than the opening area of ​​the second through hole; wherein the first through hole and the second through hole are arranged sequentially along the airflow direction in the second ejector tube 112.

[0079] Specifically, the second through-hole is a strip-shaped hole that extends along the airflow direction in the second ejector tube 112. The strip-shaped hole design increases the opening area of ​​the second through-hole and also extends the air delivery path.

[0080] Alternatively, each of the first through holes and each of the second through holes may include a plurality of vent sub-holes; wherein the number of vent sub-holes per unit area in the region where the first through hole is located is less than the number of vent sub-holes per unit area in the region where the second through hole is located.

[0081] In addition, the plurality of vent holes are arranged sequentially along the airflow direction in the second ejector tube 112.

[0082] In another embodiment of this application, the cross-sectional area of ​​the airflow path of the air outlet in the second ejector tube 112 is smaller than the area of ​​the ejector port of the second ejector tube 112.

[0083] Specifically, in order to increase the airflow output velocity of the exhaust section, the cross-sectional area of ​​the airflow path in the exhaust section is smaller, thereby increasing the airflow velocity output from the exhaust port 1121. At the same time, by matching the increasing trend of the opening area of ​​different exhaust ports 1121, the airflow velocity can be appropriately increased while ensuring the airflow velocity.

[0084] In one embodiment, the air outlet extends obliquely from top to bottom, and the angle between the oblique extension direction of the air outlet and the air inlet direction of the second ejector tube 112 is 15° to 30°.

[0085] Specifically, the above-mentioned angled design of the exhaust section improves the local resistance caused by the abrupt change in the cross-section of the exhaust section, so that the rich mixture still has a high velocity when it exits the exhaust port 1121, providing sufficient energy for subsequent mixing and development in the rich flame channel. At the same time, the gentler slope of the slope also increases the volume of the rich mixture inlet structure, which increases the amount of rich mixture flowing through the exhaust port 1121 at the same time and accelerates the flow rate, which is beneficial to the subsequent diffusion of the rich mixture.

[0086] In another embodiment of this application, a plurality of vertical protrusions 121 are provided on the inner surface of the side cover plate 12, and the vertical protrusions 121 abut against the fire bar body 11;

[0087] A gap is formed between two adjacent vertical protrusions 121.

[0088] Specifically, a transverse protrusion 122 was added to the rich gas mixing area formed between the side cover plate 12 and the main body of the burner 11, ensuring the uniformity of airflow at the rich flame nozzle. This solves the problem of excessive gas output at the rich flame nozzle adjacent to the gas outlet due to the limitations of the outlet location.

[0089] Furthermore, at least two transverse protrusions 122 are provided on the side cover plate 12, and each transverse protrusion 122 is provided with a vertical protrusion 121 at both ends;

[0090] The inner surface of the side cover plate 12 is also provided with a flow guiding protrusion 123. The lower part of the flow guiding protrusion 123 has an arc-shaped structure. The flow guiding protrusion 123 is located below the interval formed between two adjacent transverse protrusions 122.

[0091] Along the airflow direction in the second ejector tube 112, the guide protrusion 123 is also located obliquely above the outlet 1121; the arc segment of the guide protrusion 123 adjacent to the outlet 1121 is configured to guide the gas output from the outlet 1121 to flow in the opposite direction to the airflow in the second ejector tube 112.

[0092] The arc segment of the guide protrusion 123 away from the vent 1121 is configured to guide the gas output from the vent 1121 to flow in the direction of the gas flow in the second ejector tube 112.

[0093] Specifically, the guide protrusion 123 is arranged obliquely above the air outlet along the airflow delivery direction of the second ejector tube 112. In this way, the rich mixed gas output from each air outlet 1121 will flow through the guide protrusion 123 to guide the airflow.

[0094] Part of the gas is blocked by the arc segment of the guide protrusion 123 adjacent to the gas outlet 1121 and flows to the dense flame port located on the second ejector tube 112. The remaining gas is guided by the arc segment of the guide protrusion 123 away from the gas outlet 1121 and transported to the dense flame port located away from the second ejector tube 112.

[0095] Meanwhile, for the rich flame port directly above the guide protrusion 123, this part of the rich flame port is located between the two transverse protrusions 122. The transverse protrusions 122 can prevent the rich mixture below from being delivered too much to the area between the vertical protrusions 121 on both sides of the transverse protrusions 122, so as to ensure that the rich flame ports distributed in the area between the two transverse protrusions 122 can also obtain sufficient rich mixture, thereby achieving the combustion stability of the rich flame and improving the flame stabilization capability of the rich flame for the lean flame.

[0096] Referring to Figure 10, which shows the distribution of CH4 in the rich mixture, the left side of the figure illustrates the CH4 distribution within the rich-lean burner 1 of this application. It can be seen that the uniform distribution of the rich mixture results in roughly uniform flame heights for the rich flames. The right side of the figure shows the CH4 distribution within a conventional concentration burner. The rich flame nozzle positioned above the outlet 1121 produces a higher rich flame due to the large supply of the rich mixture. The uneven distribution of the rich mixture leads to higher flame heights in some areas, making flame lift-off more likely.

[0097] In Example 2, in order to reduce the occurrence of flame detachment in the light flame and to enable the light flame itself to have a certain flame stabilization capability, at least the following structural improvements are made to the light flame assembly 13.

[0098] The light flame assembly 13 includes two outer flame plates 131 and two inner flame plates 132, with the inner flame plates 132 located between the two outer flame plates 131.

[0099] Multiple first air supply channels are formed between the two inner flame plates 132, and multiple second air supply channels are formed between the outer flame plate 131 and the adjacent inner flame plate 132. Both the first air supply channels and the second air supply channels are provided with light flame openings.

[0100] The light flame flow channel is configured such that the airflow resistance generated by the first air delivery channel is greater than the airflow resistance generated by the second air delivery channel.

[0101] Specifically, for the lean flame assembly 13, a second air supply channel is distributed outside the first air supply channel. After the lean mixture flows into the first and second air supply channels respectively, the airflow resistance of the first air supply channel is greater, resulting in a lower exhaust velocity at the lean flame nozzle of the first air supply channel. During combustion, the flame height generated by the lean flame nozzle of the first air supply channel will be lower than that generated by the lean flame nozzle of the second air supply channel. Thus, the lower lean flame generated by the middle lean flame nozzle provides flame-stabilizing treatment for the higher lean flame generated by the lean flame nozzles on both sides, giving the lean flame itself the ability to stabilize the flame.

[0102] To increase the airflow resistance of the first air delivery channel, various methods can be used.

[0103] For example, multiple faint flame openings are formed between the two inner flame plates 132, and multiple faint flame openings are also formed between the outer flame plate 131 and the adjacent inner flame plate 132; wherein, the number of faint flame openings between the two inner flame plates 132 is greater than the number of faint flame openings between the outer flame plate 131 and the adjacent inner flame plate 132.

[0104] Specifically, by increasing the number of light flame ports between the inner flame plates 132, the exhaust area of ​​a single light flame port in the first air supply channel is reduced, thereby increasing the airflow resistance of the first air supply channel.

[0105] Alternatively, the air delivery path of the first air delivery channel can be extended, meaning the length of the first air delivery channel is greater than the length of the second air delivery channel.

[0106] Specifically, the first air delivery channel has a longer air delivery path, which can increase the airflow resistance of the first air delivery channel.

[0107] In one embodiment, the inner surface of the inner flame plate 132 is provided with a plurality of raised first molding portions 133, the first molding portions 133 being strip-shaped and vertically arranged; the first molding portions 133 on one inner flame plate 132 abut against the first molding portions 133 on another inner flame plate 132, the two abutting first molding portions 133 forming a molding interval; wherein, two adjacent molding intervals form a faint flame opening between the edges of the two inner flame plates 132; two adjacent molding intervals form a first air supply channel between the two inner flame plates 132.

[0108] Similarly, the inner surface of the outer flame plate 131 is provided with a plurality of raised second molding portions 134, the second molding portions 134 having a strip-shaped structure and being arranged vertically; the second molding portions 134 form a plurality of light flame openings at intervals between the edge of the outer flame plate 131 and the edge of the adjacent inner flame plate 132, and two adjacent second molding portions 134 form a second air supply channel between the outer flame plate 131 and the adjacent inner flame plate 132.

[0109] By designing the number of inner light flame ports in the light flame assembly 13 to be greater than the number of outer light flame ports, the airflow resistance of the inner light flame ports is increased. The overall increase in the number of light flame ports in the light flame assembly 13 can, on the one hand, increase the resistance of the light flame ports and reduce the mixing air velocity in the high-speed zone where the inner light flame ports are located, and on the other hand, reduce the mutual influence between adjacent light flame ports. The low flow velocity of the lean mixture in the inner adjacent light flame ports can further stabilize the outer light flame, reduce the occurrence of flame lift-off phenomenon in the outer light flame ports, improve the combustion effect, and achieve optimized flame stabilization effect to improve flame combustion stability. At the same time, since the occurrence rate of light flame lift-off is reduced, flame combustion stability can be ensured and combustion noise is reduced.

[0110] In another embodiment of this application, the inner surface of the inner flame plate 132 is provided with a plurality of protruding flow-blocking molding portions 135.

[0111] The flow-blocking molding section 135 is located between the two inner flame plates 132 and is configured to increase the intake resistance between the two inner flame plates 132.

[0112] Specifically, in order to further increase the intake resistance of the first air delivery channel formed between the two inner flame plates 132, a flow-blocking molding section 135 can be added between the two inner flame plates 132. The flow-blocking molding section 135 can further increase the flow velocity and flow rate of the lean mixture entering between the two inner flame plates 132.

[0113] In one of the inner flame plates 132, the flow-blocking molding portion 135 is attached to the flow-blocking molding portion 135 on the other inner flame plate 132; or, the flow-blocking molding portion 135 on one inner flame plate 132 is attached to the inner surface of the other inner flame plate 132.

[0114] In addition, the width of the plurality of flow-blocking molding portions 135 tends to increase along the airflow direction in the first ejector tube 111; or, the density of the flow-blocking molding portions 135 distributed on the inner flame plate 132 tends to increase along the airflow direction in the first ejector tube 111.

[0115] In one embodiment, a first mounting plate 136 is provided at one end of the inner flame plate 132, and a second mounting plate 137 is provided at the other end of the inner flame plate 132; both the first mounting plate 136 and the second mounting plate 137 are arranged to extend vertically, and the height dimensions of the first mounting plate 136 and the second mounting plate 137 are different.

[0116] Specifically, due to the different structural dimensions or numbers of the flow-blocking molding sections 135 distributed at different positions of the inner flame plate 132, to prevent assemblers from incorrectly inserting the light flame assembly 13 into the mounting port 114 of the flame bar body 11, a first mounting plate 136 and a second mounting plate 137 of different heights are specifically provided. When the light flame assembly 13 is inserted into the mounting port 114, the first mounting plate 136 and the second mounting plate 137 of different heights, in conjunction with the structural design of the mounting port 114, serve to prevent incorrect insertion.

[0117] Example 3, as shown in Figures 6-8, based on Examples 1 and 2 above, in order to further improve the combustion efficiency of each rich and lean combustor 1 and enable the gas and air to mix fully, the outer shell 2 of the burner is designed with the following structural improvements.

[0118] A secondary air duct is formed between two adjacent concentration-dilute flame bars 1; a first overlapping portion 14 is formed at the end of the concentration-dilute flame bar 1 away from the injection port of the first injection tube 111, and a second overlapping portion 15 is formed at the end of the concentration-dilute flame bar 1 adjacent to the injection port of the first injection tube 111; an inclined limiting portion 16 is formed between the first overlapping portion 14 and the bottom of the concentration-dilute flame bar 1.

[0119] The bottom of the outer casing 2 forms a bent surface 24, which has a first mounting surface 241, a second mounting surface 242, and a third mounting surface 243.

[0120] The first mounting surface 241 is higher than the second mounting surface 242, the third mounting surface 243 is higher than the second mounting surface 242, and the second mounting surface 242 is located between the first mounting surface 241 and the third mounting surface 243;

[0121] The ventilation opening 23 includes a first sub-vent 231, a second sub-vent 232, and a third sub-vent 233. The first sub-vent 231 is formed on the first mounting surface 241, the second sub-vent 232 is formed on the second mounting surface 242, and the third sub-vent 233 is formed on the third mounting surface 243.

[0122] The first overlapping portion 14 is arranged above the first mounting surface 241, and the second overlapping portion 15 is arranged above the third mounting surface 243.

[0123] Specifically, the end of the concentration / dilute combustor 1 furthest from the injector is formed as a first overlap portion 14. In order to ensure the air intake, the secondary air duct between the two first overlap portions 14 of two adjacent concentration / dilute combustor 1s can be formed by bending surface 24 to form a first mounting surface 241 that fits tightly against the bottom of the first overlap portion 14. In this way, the installation requirements can be met, and the secondary air introduced by the first sub-air inlet 231 on the first mounting surface 241 can directly enter the secondary air duct where the first overlap portion 14 is located, so as to ensure sufficient secondary air supply.

[0124] The enrichment / lean burner 1 forms a second overlapping portion 15 at its end adjacent to the injector for installation, and overlaps with the third mounting surface 243 through the second overlapping portion 15. Simultaneously, to ensure sufficient secondary air supply at the second overlapping portion 15, a third sub-air inlet 233 is also provided on the third mounting surface 243. The third sub-air inlet 233 is adjacent to the bottom of the second overlapping portion 15, allowing the secondary air introduced through the third sub-air inlet 233 to directly enter the secondary air duct. In this way, sufficient secondary air supply can be obtained at all positions of the enrichment / lean burner 1, improving the uniformity of gas-air mixing and thus improving the completeness of gas combustion.

[0125] The first mounting surface 241 is provided with a plurality of first sub-air inlets 231 arranged side by side, so as to supply secondary air evenly at the bottom of each concentration-divergence combustor 1. Alternatively, the first sub-air inlets 231 can be designed as strip-shaped holes, extending along the length of the concentration-divergence combustor 1 and located on one side of the combustor 1.

[0126] In some embodiments, the second mounting surface 242 is provided with a plurality of second sub-vents 232 arranged side by side. The second sub-vents 232 are strip-shaped holes and extend along the length direction of the concentration / divergence combustor 1. Specifically, there may be multiple second sub-vents 232, and the second sub-vents 232 also extend along the length direction of the concentration / divergence combustor 1.

[0127] Alternatively, the second mounting surface 242 may be provided with at least one second sub-air vent 232, which extends along a length direction perpendicular to the length of the concentration / divergence combustor 1. Specifically, there may be one second sub-air vent 232, which occupies sufficient space on the second mounting surface 242 to meet the secondary air intake requirements of a large area at the bottom of the multiple concentration / divergence combustor 1.

[0128] In some embodiments, the third mounting surface 243 is provided with a plurality of third sub-air inlets 233 arranged side by side, so as to supply secondary air evenly at the bottom of each enrichment / diluted combustor 1. Alternatively, the third sub-air inlets 233 can be designed as strip-shaped holes, extending along the length of the enrichment / diluted combustor 1.

[0129] By setting a vent 23 at the bottom of the outer casing 2, the vent 23 can be distributed according to the requirements of secondary ventilation at the bottom of the rich and lean burner 1. Thus, during use, it can be ensured that the secondary air distribution at different positions of the rich and lean burner 1 is uniform, thereby improving the uniformity of gas and air mixing and improving the completeness of gas combustion.

[0130] In another embodiment of this application, a plurality of mounting slots 25 are provided on the stepped structure formed between the first mounting surface 241 and the second mounting surface 242 on the bottom plate of the outer casing 2. The inclined limiting part 16 is inserted into the corresponding mounting slot 25 for installation and positioning. In this way, the mounting slots 25 provided on the bottom of the outer casing 2 can be used to position each enrichment / dilute ignition bar 1, eliminating the need for additional independent mounting brackets to install the enrichment / dilute ignition bars 1, reducing the number of parts and improving assembly efficiency.

[0131] Example 4, as shown in Figure 9, this application also provides a gas water heater, which includes:

[0132] The housing 100 is further provided with a water inlet pipe 101 and a water outlet pipe 102.

[0133] Heat exchanger 200, wherein a heat exchange flow channel is formed in the heat exchanger;

[0134] Burner 300, the burner is the burner described in Embodiments 1 to 3 above;

[0135] Fan 400;

[0136] The heat exchanger, the burner, and the fan are disposed in the casing. The burner is arranged above the heat exchanger. The air outlet of the fan is connected to the ventilation port of the casing. The heat exchange channel is connected between the water inlet pipe and the water outlet pipe.

Claims

A down drum type gas water heater comprises: a casing, which is further provided with a water inlet pipe and a water outlet pipe; a heat exchanger, which is formed with a heat exchange flow channel; a burner, which comprises a shell and a plurality of thick and thin fire arrays, the shell is provided with a plurality of first air inlets and a plurality of second air inlets on one side, and is provided with a ventilation port at the bottom, the fire array is provided with a first ejector pipe and a second ejector pipe on one side, and is provided with a thick flame flow channel and a thin flame flow channel, the thin flame flow channel comprises a plurality of first air supply channels and a plurality of second air supply channels, the second air supply channels are distributed on both sides of the first air supply channels, the thin flame flow channel is configured such that the air flow resistance generated by the first air supply channels is greater than the air flow resistance generated by the second air supply channels, and the first ejector pipe is respectively connected with the first air supply channel and the second air supply channel; the second ejector pipe is provided with a plurality of air outlets, and the second ejector pipe is connected with the thick flame flow channel through the plurality of air outlets, and the opening area of the plurality of air outlets along the air flow direction in the second ejector pipe presents a trend of increasing; a fan; wherein the heat exchanger, the burner and the fan are arranged in the casing, the burner is arranged above the heat exchanger, the air outlet of the fan is connected with the ventilation port of the shell, and the heat exchange flow channel is connected between the water inlet pipe and the water outlet pipe. The lower-drum type gas water heater according to claim 1, wherein The thick and thin fire array comprises: a fire array body, which is provided with a first ejector pipe and a second ejector pipe, and is further provided with a distribution flow channel and a mounting port, the mounting port, the distribution flow channel and the first ejector pipe are sequentially connected, the tail of the second ejector pipe forms an air outlet part, and the air outlet part is provided with a plurality of air outlets; a side cover plate, which is arranged on the fire array body and covers the air outlets, and forms the thick flame flow channel between the side cover plate and the fire array body, and the thick flame flow channel is provided with a thick flame port; a thin flame assembly, which comprises two outer flame plates and two inner flame plates, the inner flame plates are located between the two outer flame plates, a plurality of first air supply channels are formed between the two inner flame plates, a plurality of second air supply channels are formed between the outer flame plate and the adjacent inner flame plate, and the first air supply channels and the second air supply channels are both provided with a thin flame port. The lower-drum type gas water heater according to claim 2, characterized in that The plurality of air outlets are divided into at least one first through hole and at least one second through hole, and the opening area of the first through hole is smaller than that of the second through hole; wherein the first through hole and the second through hole are sequentially arranged along the air flow direction in the second ejector pipe. The lower-drum type gas water heater according to claim 3, characterized in that The second through hole is a strip-shaped hole, which extends along the air flow direction in the second ejector pipe; or, each first through hole and each second through hole respectively comprises a plurality of air supply sub-holes, and the number of air supply sub-holes per unit area in the region of the first through hole is less than that in the region of the second through hole. The lower-drum type gas water heater according to claim 2, wherein The inner surface of the side cover plate is further provided with a plurality of vertical protrusions, which abut against the fire array body; The interval is formed between two adjacent vertical protrusions. The lower-drum type gas water heater according to claim 5, characterized in that At least two lateral protrusions are arranged on the side cover plate, and two ends of each lateral protrusion are respectively provided with the vertical protrusion. A flow guide protrusion is further arranged on the inner surface of the side cover plate, the lower part of the flow guide protrusion is in an arc structure, and the flow guide protrusion is located below the interval formed between two adjacent lateral protrusions. Along the direction of the airflow in the second ejector pipe, the flow guide protrusion is also located obliquely above the air outlet hole; the flow guide protrusion is configured to guide the gas output by the air outlet hole to flow in the opposite direction of the airflow in the second ejector pipe compared with the arc segment adjacent to the air outlet hole. The flow guide protrusion is configured to guide the gas output by the air outlet hole to flow in a direction of the airflow in the second ejector pipe away from the arc segment adjacent to the air outlet hole. The lower-drum type gas water heater according to claim 2, characterized in that The number of the light flame ports between two inner flame plates is greater than the number of the light flame ports between the outer flame plate and the adjacent inner flame plate. The length of the first gas supply channel is greater than the length of the second gas supply channel. The lower-drum type gas water heater according to claim 7, characterized in that The inner surface of the inner flame plate is provided with a plurality of protruding first profiled parts in strip structure and vertical arrangement. The first profiled parts on one inner flame plate abut against the first profiled parts on another inner flame plate, and the abutted two first profiled parts form a profiled interval, and two adjacent profiled intervals form a first gas supply channel between the two inner flame plates. The inner surface of the outer flame plate is provided with a plurality of protruding second profiled parts in strip structure and vertical arrangement, and two adjacent second profiled parts form a second gas supply channel between the outer flame plate and the adjacent inner flame plate. The lower-drum type gas water heater according to claim 2, characterized in that The inner surface of the inner flame plate is provided with a plurality of protruding flow resistance profiled parts. The flow resistance profiled parts are located between the two inner flame plates and are configured to increase the air inlet resistance between the two inner flame plates. The lower-drum type gas water heater according to claim 1, wherein Secondary air channels are formed between two adjacent dense-light flame rows; the end of the dense-light flame row away from the injection port of the first ejector pipe forms a first lap joint, the end of the dense-light flame row adjacent to the injection port of the first ejector pipe forms a second lap joint, and an inclined limiting part is formed between the first lap joint and the bottom of the dense-light flame row. The bottom of the shell forms a bending surface, the bending surface has a first mounting surface, a second mounting surface and a third mounting surface, The first mounting surface is higher than the second mounting surface, the third mounting surface is higher than the second mounting surface, and the second mounting surface is located between the first mounting surface and the third mounting surface. The ventilation opening includes a first sub-air opening, a second sub-air opening and a third sub-air opening, the first sub-air opening is formed on the first mounting surface, the second sub-air opening is formed on the second mounting surface, and the third sub-air opening is formed on the third mounting surface. The first lap joint is arranged above the first mounting surface, and the second lap joint is arranged above the third mounting surface.

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