Fire grate, burner and gas water heater

Abstract

The utility model discloses a fire grate, a burner and a gas water heater. An injection opening and a plurality of main fire holes are formed in the fire grate, a gas supply channel is further arranged in the fire grate, the gas supply channel is provided with a gas inlet section, a bent section and a distribution section which are sequentially connected, the injection opening is communicated with the gas inlet section, and the main fire holes are arranged side by side in the length direction of the distribution section. A first throttling protrusion part and a second throttling protrusion part are further arranged in the fire grate, the first throttling protrusion part is arranged on the outer side of the bent section, and the second throttling protrusion part is arranged on the outer side of the first throttling protrusion part and extends in the length direction of the distribution section. The mixing uniformity of gas and air in a fire grate of the combustor is improved, so that the combustion sufficiency of the gas is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of household appliances, and in particular relates to a fire grate, a burner and a gas water heater. Background Art

[0002] At present, water heaters are household appliances commonly used in people's daily lives. Water heaters are divided into gas water heaters and electric water heaters. Among them, gas water heaters are widely used because of their convenience. Conventional gas water heaters usually include components such as a fan, a burner, a combustion chamber and a heat exchanger. The burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger.

[0003] The burner is an important component of the gas water heater. Chinese patent publication No. CN 218095940 U discloses a fire grate, a burner and a gas water heater. In order to reduce the phenomenon of local load concentration, a pressure profile is provided at the turning part of the gas supply channel to prevent excessive gas from flowing from the corner position to the fire hole output at the end of the fire grate.

[0004] However, in actual use, although the pressure profile on the fire grate can reduce the gas supply to the fire hole at the turning part of the air supply channel, due to the high air flow velocity in the air supply channel, a large vortex is still generated, which in turn affects the outflow of air in this area. As a result, the flames in this fire hole are abnormal and the stability is poor when burning. In view of this, how to design a technology to improve the combustion uniformity and stability of the fire grate is a technical problem to be solved by the utility model. Utility Model Content

[0005] The utility model provides a fire grate, a burner and a gas water heater, which can improve the mixing uniformity of gas and air in the fire grate of the burner to improve the completeness of gas combustion.

[0006] In order to achieve the above technical objectives, the utility model adopts the following technical solutions:

[0007] In one aspect, the utility model provides a fire grate, which is provided with an introduction port and a plurality of main fire holes, and an air supply channel is also provided inside the fire grate, and the air supply channel has an air intake section, a bending section and a distribution section connected in sequence, the introduction port is connected to the air intake section, and a plurality of main fire holes are arranged side by side along the length direction of the distribution section, and a first throttling protrusion and a second throttling protrusion are also provided inside the fire grate, the first throttling protrusion is arranged on the outside of the bending section, and the second throttling protrusion is arranged on the outside of the first throttling protrusion and extends along the length direction of the distribution section.

[0008] In one embodiment of the present application, the first throttling protrusion is overall arc-shaped and extends along the bending direction of the bending section.

[0009] In one embodiment of the present application, a diversion chamber is provided inside the fire grate on the outside of the curved section, and the diversion chamber is communicated with the curved section of the air supply channel.

[0010] In one embodiment of the present application, the first throttling protrusion is arranged at a position where the diversion chamber is connected to the curved section of the air supply channel.

[0011] In one embodiment of the present application, the second throttling protrusion is in a strip-shaped structure and is arranged laterally in the diversion chamber.

[0012] In one embodiment of the present application, a combustion channel and a gradually widening channel are further provided in the fire grate, and the combustion channel, the gradually widening channel and the distribution section all extend along the length direction of the fire grate, the combustion channel and the gradually widening channel are arranged side by side and connected to each other, the diversion chamber and the distribution section are respectively connected to the gradually widening channel, the gradually widening channel gradually widens along the direction in which the airflow enters the combustion channel, and the main fire hole is connected to the combustion channel.

[0013] On the other hand, an embodiment of the present application further provides a burner, including a shell and a plurality of fire bars, wherein the fire bars are the above-mentioned fire bars, and the plurality of fire bars are arranged side by side and disposed in the shell.

[0014] In one embodiment of the present application, a side wall of the housing is provided with a plurality of first vents, the plurality of first vents are arranged side by side, and a lower portion of the housing is further provided with at least one second vent;

[0015] A secondary air duct is formed between two adjacent fire bars, the induced section of the fire bar is connected to the corresponding first ventilation port, the fire bar is arranged above the second ventilation port, and the secondary air duct is communicated with the second ventilation port.

[0016] In one embodiment of the present application, the housing includes an enclosure and a bottom plate, the first vent is provided on one side wall of the enclosure, and positioning ribs are provided on the inner surface of the enclosure around the outer periphery of the first vent;

[0017] The bottom plate is provided with the second vent, the bottom plate is provided at the bottom of the enclosure, and a plurality of mounting slots are provided on the bottom plate, and the mounting slots are arranged opposite to the corresponding positioning ribs;

[0018] The ejection port of the fire bar is connected to the corresponding positioning rib, and the fire bar is also stuck in the corresponding installation slot.

[0019] On the other hand, an embodiment of the present application further provides a gas water heater, comprising a casing and the above-mentioned burner, wherein the burner is located in the casing.

[0020] By arranging a first throttling protrusion and a second throttling protrusion on the outside of the curved section inside the fire grate, for the second throttling protrusion, the second throttling protrusion will be extended along the length direction of the distribution section, so that when the airflow flows through the curved section, part of the airflow turns to flow into the distribution section to be evenly distributed to the main fire holes corresponding to the distribution section, and the airflow flowing to the outside of the curved section will first be throttled by the first throttling protrusion to reduce the inflow of the airflow. At the same time, the airflow flowing through the first throttling protrusion will be further diffused by the second throttling protrusion inside the fire grate. The first throttling protrusion can effectively reduce the excessive airflow flowing out due to the airflow passing through the curved section, thereby avoiding the distribution of too much gas to the main fire holes in the area where the airflow in the distribution section is located; and further throttling at the second throttling protrusion can further make the airflow flowing through the first throttling protrusion be throttled again and evenly distributed, which can effectively reduce the influence of vortexes, improve the airflow velocity of the main fire holes in the vortex generating area, so as to improve the combustion uniformity of the fire grate and the stability of the flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 One of the structural diagrams of an embodiment of the utility model fire row;

[0023] Figure 2 A schematic diagram of the structure of the utility model fire row of an embodiment of the second;

[0024] Figure 3 A schematic diagram of the partial structure of an embodiment of the utility model fire row;

[0025] Figure 4 One of the cross-sectional views of an embodiment of the utility model fire row;

[0026] Figure 5 A cross-sectional view of the utility model fire row of an embodiment of the second;

[0027] Figure 6 A schematic diagram of the structure of a flame stabilizing shell in one embodiment of the utility model fire row;

[0028] Figure 7 This is one of the flame simulation diagrams of the fire grate of the utility model;

[0029] Figure 8 This is the second flame simulation diagram of the fire grate of the utility model;

[0030] Fig. 9 This is the airflow simulation distribution diagram of the fire grate of the utility model;

[0031] Fig.10 It is a flame simulation diagram of a fire row in the prior art;

[0032] Fig.11 It is a simulated distribution diagram of the airflow of the fire row in the prior art;

[0033] Fig.12 One of the schematic diagrams of the structure of the utility model burner embodiment;

[0034] Fig.13 The utility model is a schematic diagram of the structure of the burner embodiment of the second;

[0035] Fig.14 The utility model is a schematic diagram of the structure of the burner embodiment of the third;

[0036] Fig.15 for Fig.12 A schematic diagram of the structure of the first mounting plate;

[0037] Fig.16 for Fig.12 A schematic diagram of the structure of the second mounting plate;

[0038] Fig.17 for Fig.12 Schematic diagram of the structure of the middle lining plate;

[0039] Fig.18 This is one of the assembly diagrams of the fire grate and the housing in the burner embodiment of the utility model;

[0040] Fig.19 This is the second assembly diagram of the fire grate and the shell in the burner embodiment of the utility model. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0046] A gas water heater is a water heater that uses gas as the main energy material and transfers the high-temperature heat generated by gas combustion to cold water flowing through a heat exchanger to prepare hot water.

[0047] A gas water heater generally comprises a shell, and components such as a burner, a heat exchanger, a fan and a fan cover arranged in the shell.

[0048] The gas is transported to the burner and ignited by an ignition device, so that the burner burns the transported gas to generate heat.

[0049] A heat exchange tube is arranged in the heat exchanger, one end of the heat exchange tube is connected to the water supply pipeline, and the other end of the heat exchange tube is connected to a shower head or a faucet.

[0050] The heat generated by the burner burning gas is used to heat the heat exchange tubes, so that the water temperature in the heat exchange tubes is increased to form hot water.

[0051] When the gas water heater is working, cold water provided by the water supply pipeline flows into the heat exchange tube, and then is heated into hot water by the heating source generated by the burner, and then flows out from the shower or faucet through the hot water valve for user use.

[0052] At the same time, when the gas water heater is working, the fan is powered on and runs at the same time. Under the action of the fan, the smoke generated by the burner is discharged to the outside.

[0053] like Figure 1-Figure 6 As shown, an embodiment of the present application provides a fire bar 11, which generally has an injection port 11 and a plurality of main fire holes 12. An air supply channel 13, a combustion channel 14 and a diversion chamber 16 are also provided inside the fire bar 1. The air supply channel 13 has an air intake section 131, a curved section 132 and a distribution section 133 connected in sequence. The injection port 11 is connected to the air intake section 131, and a plurality of main fire holes 12 are arranged side by side along the length direction of the distribution section 133. The diversion chamber 16 is connected to the curved section 132, and the distribution section 133 and the diversion chamber 16 are respectively connected to the combustion channel 14. Optionally, a gradually widening channel 15 is also provided inside the fire bar 1, and the distribution section 133 and the diversion chamber 16 are respectively connected to the combustion channel 14 through the gradually widening channel 15.

[0054] During use, the gas and air enter the air inlet section 131 through the injection port 11. When the airflow flows through the curved section 132, part of the airflow changes direction and flows into the distribution section 133, and part of the airflow will rely on inertia to flow to the diversion chamber 16 outside the curved section 132.

[0055] Embodiment 1: In order to reduce the technical problem of uneven gas distribution caused by airflow impact in the curved section 132, at least the following structural improvements are made to the fire grate 1.

[0056] The fire bar 1 is further provided with a first throttling protrusion 161 and a second throttling protrusion 162 in the diversion chamber 16 , wherein the first throttling protrusion is arranged on the outside of the bending section 132 , and the second throttling protrusion is arranged on the outside of the first throttling protrusion and extends along the length direction of the distribution section 133 .

[0057] Specifically, the first throttling protrusion is adjacent to the curved section 132 and is located outside the curved section 132. After the airflow enters the curved section 132, the airflow flowing to the diverter chamber 16 is throttled by the first throttling protrusion, which can effectively prevent excessive airflow from entering the diverter chamber 16. The airflow entering the diverter chamber 16 will further be throttled by the second throttling protrusion in the process of flowing to the combustion channel 14, so that the airflow is more evenly dispersed and output from the diverter chamber 16.

[0058] More importantly, the first throttling protrusion 161 is arranged transversely in the flow dividing chamber 16, so as to further block the airflow entering the flow dividing chamber 16, thereby reducing the formation of vortices in the flow dividing chamber 16. Fig.11 As shown, in conventional technology Fig.11 A relatively large vortex will be formed in the C region of the flow divider chamber 16; Fig. 9 The range of the vortex formed in the B region within the diversion chamber 16 of the present application is greatly reduced.

[0059] In one embodiment, the first throttling protrusion is overall arc-shaped and extends along the bending direction of the bending section 132 .

[0060] Specifically, for the first throttling protrusion, since it is arranged on the outside of the curved section 132, the first throttling protrusion is designed to be conformed around the outside of the curved section 132. On the one hand, the first throttling protrusion can play a throttling role. On the other hand, the first throttling protrusion can further guide the airflow to the distribution section 133, which is more conducive to improving the uniformity of gas distribution.

[0061] In another embodiment, a diversion chamber 16 is provided inside the fire bar 1 outside the curved section 132, and the diversion chamber 16 is connected to the curved section 132 of the air supply channel 13. In addition, a first throttling protrusion is arranged at a position where the diversion chamber 16 is connected to the curved section 132 of the air supply channel 13.

[0062] Specifically, the first throttling protrusion is arranged at the connection portion between the diverter chamber 16 and the curved section 132 to maximize the throttling effect and ensure the uniformity of gas distribution to improve the completeness of combustion.

[0063] In some embodiments, the second throttling protrusion is in a strip-shaped structure and is arranged transversely in the diversion chamber 16 .

[0064] Specifically, for the second throttling protrusion, the throttling of the second throttling protrusion does not need to be too large, and it only needs to disperse the airflow evenly in the diversion chamber 16. To this end, the second throttling protrusion has a strip structure, which makes the width of the second throttling protrusion smaller and the length longer. In this way, the airflow entering the diversion chamber 16 can be dispersed more evenly.

[0065] In certain embodiments, the combustion channel 14, the gradually widening channel 15 and the distribution section 133 all extend along the length direction of the fire bar 1, the combustion channel 14 and the gradually widening channel 15 are arranged side by side and connected to each other, the diversion chamber 16 and the distribution section 133 are respectively connected to the gradually widening channel 15, and the gradually widening channel 15 gradually widens along the direction in which the airflow enters the combustion channel 14.

[0066] Embodiment 2: In order to reduce the effect of flames at both ends of the fire grate 1 spreading toward the outside of the ends and causing overheating damage to the burner wall, at least the following structural improvements are made to the fire grate 1.

[0067] The two ends of the fire bar 1 are respectively provided with combustion protrusions 17, the combustion protrusions 17 extend toward the outside of the fire bar 1 along the gas outlet direction of the main fire hole 12, and the combustion protrusions 17 are provided with combustion holes 171;

[0068] Among them, the plurality of main fire holes 12 are located between the combustion protrusions 17 at the two ends of the fire bar 1 .

[0069] Specifically, a plurality of main fire holes 12 are arranged in sequence along the length direction of the fire grate 1 on the upper surface of the fire grate 1, and a combustion protrusion 17 protruding from the upper surface of the fire grate 1 is additionally provided at the end of the fire grate 1 and located outside the main fire holes 12. The combustion holes 171 provided on the combustion protrusion 17 are also connected to the combustion channel 14.

[0070] During use, the mixture of fuel gas and air will be output from the main fire hole 12 and the combustion holes 171 at both ends and ignite and burn. Since the root of the flame generated by the combustion hole 171 is higher than the root of the flame generated by the main fire hole 12, the flame generated by the combustion hole 171 is less affected by the flame generated by the main fire hole 12 adjacent to the combustion hole 171, thereby ensuring that the flame generated by the combustion hole 171 can burn in a direction substantially perpendicular to the upper surface of the fire grate 1, and the flame generated by the combustion hole 171 will not spread outward toward the end of the fire grate 1, so as to effectively reduce the flame baking the side wall of the burner.

[0071] In the actual design process, since the flame is well vertical during formation, the heating effect on the burner side wall is relatively light, so the number of cooling holes on the combustion chamber wall can be reduced, and the cooling air can be reduced. For the upward extraction model, the number of cooling holes is reduced, the machine sealing is improved, and the air that should be used for cooling participates in the combustion, further reducing the combustion pollutants.

[0072] refer to Fig.10 As shown, in conventional technology Fig.10 The flames at both ends of the fire grate 1 shown in the figure tend to expand toward the outside of the ends of the fire grate 1, and the flames of the main fire holes 12 corresponding to the curved section 132 are higher, which may cause the side wall of the burner to be overheated and the combustion distribution to be uneven. Figure 7 and Figure 8 The fire bar 1 in the present application shown in the figure generates flames due to the combustion holes 171 formed by the combustion protrusions 17 at the ends thereof. The flames formed by the combustion holes 171 (refer to Figure 8 The good verticality during molding (A area in the figure) has little effect on the heating of the side wall of the burner.

[0073] In another embodiment of the present application, flanged holes are respectively provided at both ends of the fire grate 1 , and the flanges of the flanged holes extend toward the outside of the fire grate 1 along the gas outlet direction of the main fire hole 12 ; the flanged holes are the combustion protrusions 17 .

[0074] Specifically, in order to facilitate the processing of the combustion protrusion 17, during the processing of the fire grate 1, a flange hole can be formed by punching the upper surface of the fire grate 1, and the flange of the flange hole will extend toward the upper surface of the upper surface of the fire grate 1. In this way, the combustion protrusion 17 and the corresponding combustion hole 171 can be formed.

[0075] In another embodiment, a plurality of the combustion protrusions 17 may be respectively provided at the two ends of the fire bar 1 as required.

[0076] Specifically, a plurality of combustion protrusions 17 are provided at the end of the fire grate 1 so that the flame output from the end of the fire grate 1 through the combustion hole 171 can be directed vertically upward and have a sufficient width to resist the influence of the flame adjacent to the main fire hole 12, thereby reducing the flame of the fire grate 1 from expanding outwardly toward the end.

[0077] In some embodiments, for the combustion hole 171 , in order to make the flame formed by the combustion hole 171 have better impact resistance, the gas outlet area of ​​the combustion hole 171 is not less than the gas outlet area of ​​the main fire hole 12 .

[0078] Specifically, the air outlet area of ​​the combustion hole 171 can be designed to be slightly larger. On the one hand, it can ensure that there is sufficient airflow output from the combustion hole 171 to obtain a flame with a more stable shape. On the other hand, the air outlet area of ​​the combustion hole 171 is increased, so that the two ends can output the airflow more smoothly, thereby solving the problem of uneven airflow distribution at the ends and improving the uniformity of airflow distribution at different positions of the fire grate 1.

[0079] Embodiment 3: In order to reduce the occurrence of incomplete combustion of gas and unstable flame, at least the following structural improvements are made to the fire grate 1.

[0080] The two side walls of the fire bar 1 are respectively provided with flame stabilizing shells 19, and a flame stabilizing flow channel is formed between the flame stabilizing shells 19 and the fire bar 1. The flame stabilizing shells 19 cover the outside of the auxiliary fire holes 18;

[0081] Wherein, a positioning protrusion 191 is provided on the inner surface of the flame stabilizing shell 19 , and the positioning protrusion 191 abuts against the side wall of the fire bar 1 .

[0082] Specifically, flame stabilizing shells 19 are respectively provided on both sides of the top of the fire grate 1, and the flame stabilizing shells 19 can form a flame stabilizing flow channel between the side walls of the fire grate 1, and the auxiliary fire holes 18 set on both sides of the fire grate 1 will be covered by the flame stabilizing shells 19, and the airflow output by the auxiliary fire holes 18 is output upward from the flame stabilizing flow channel to cooperate with the flame formed by the main fire hole 12 for combustion.

[0083] Among them, since the flame-stabilizing shell 19 is provided with a positioning protrusion 191, the positioning protrusion 191 is against the side wall of the fire grate 1, and the protrusion size of the positioning protrusion 191 is used to effectively and accurately control the width of the flame-stabilizing flow channel, thereby achieving the consistency of the width of the flame-stabilizing flow channels on both sides of the fire grate 1, improving the completeness of gas combustion and ensuring the stability of the flame shape. The design of the positioning protrusion 191 can, on the one hand, ensure that the size of the single-sided flame-stabilizing flow channel meets the design requirements of the drawing, and on the other hand, ensure that the size of the flame-stabilizing flow channels on both sides meets the design requirements of the drawing.

[0084] In some embodiments, a plurality of positioning protrusions 191 are provided on the inner surface of the flame stabilizing shell 19 , and the plurality of positioning protrusions 191 are sequentially arranged side by side along the length direction of the fire bar 1 .

[0085] Specifically, for the flame stabilizing shell 19 , a plurality of positioning protrusions 191 are provided on its inner wall along the length direction of the fire bar 1 . The plurality of positioning protrusions 191 can ensure that the width of the flame stabilizing channel in the length direction of the fire bar 1 remains consistent.

[0086] The airflow output by the flame stabilizing flow channel will also form a flame above it, which, together with the main flame formed by the main flame hole, can make the combustion more complete and more stable, allowing fire row 1 to achieve a greater combustion load and significantly increase the TDR (maximum load / minimum load) of fire row 1. Fire row 1 has strong versatility and can be adapted to different models and different altitude environments.

[0087] In some embodiments, a plurality of connecting ribs 192 are further provided between the two flame stabilizing shells 19 , and the connecting ribs 192 are located between two adjacent main fire holes 12 .

[0088] Specifically, the flame stabilizing shells 19 on both sides of the fire bar 1 are connected by a plurality of connecting ribs 192, so that the two flame stabilizing shells 19 are integrally assembled onto the fire bar 1 to facilitate processing and production.

[0089] In another embodiment, two ends of the flame stabilizing shell 19 are further provided with fire transfer pieces 193 , and the fire transfer pieces 193 are bent toward the outside of the flame stabilizing shell 19 .

[0090] Specifically, the usage scenarios of gas water heaters vary. Users have different water temperature and water volume requirements. The number of fire bars 1 burning in the gas water heater is different, and each scenario corresponds to a different combustion segment. In order to meet the user's multi-scenario usage needs, the gas water heater needs to switch segments quickly. Therefore, the fast fire transfer performance between each fire bar 1 is very important.

[0091] By arranging the flame transfer pieces 193 at both ends of the flame stabilizing shell 19, on the one hand, the narrowing area of ​​the flame transfer pieces 193 does not need to be too large, and the flame transfer can be achieved through the flame transfer pieces 193 at the ends. On the other hand, the flame transfer pieces 193 are arranged on one side of the combustion hole 171, and the combustion hole 171 can generate a flame in a stable form to meet the requirement of fast and stable flame transfer between two adjacent fire bars 1 through the flame transfer pieces 193. In addition, the number of the flame transfer pieces 193 is small, the area is small, the interference to the airflow on both sides of the fire bar 1 is small, and the influence on combustion is small.

[0092] Embodiment 4: Based on the above embodiments 1 to 3, the present application further provides a burner, which can adopt the structural configuration of the fire bar in embodiment 1, embodiment 2 and / or embodiment 3. The following improved designs are made for the installation structure of the fire bar, the design of the primary air and the secondary air.

[0093] like Figure 12-Figure 19 As shown, an embodiment of the present application provides a burner, comprising: a shell 2 and a plurality of fire bars 1, wherein the plurality of fire bars 1 are arranged side by side and disposed in the shell 2, and the fire bars 1 have an induced draft section to introduce fuel gas and primary air for combustion.

[0094] In order to improve the uniform distribution of the secondary air of the fire grate 1 and ensure that the gas and air at each position of the fire grate 1 are evenly mixed to improve the completeness of gas combustion, the following structural improvements are made to the outer shell 2 and the fire grate 1.

[0095] A side wall of the housing 2 is provided with a plurality of first vents 201, the plurality of first vents 201 are arranged side by side, and a lower portion of the housing 2 is further provided with at least one second vent 202;

[0096] A secondary air duct is formed between two adjacent fire bars 1 , the induced section of the fire bar 1 is connected to the corresponding first ventilation opening 201 , the fire bar 1 is arranged above the second ventilation opening 202 , and the secondary air duct is connected to the second ventilation opening 202 .

[0097] Specifically, after the fire grate 1 is installed in the shell 2, the ejection port of the ejection section of the fire grate 1 is connected to the first vent 201 on the shell 2, and the gas mixed with the primary air enters the ejection port through the first vent. After the gas and the primary air are mixed in the fire grate 1 and output from the air outlet of the fire grate 1 and ignited, the secondary air is introduced into the shell 2 through the second vent 202 set at the bottom of the shell 2. In addition, since the second vent 202 is arranged at the bottom of the shell 2, it is convenient to design the opening according to the demand for secondary air at different positions of the fire grate 1, so as to ensure that the secondary air can be more evenly distributed at the air outlets at various positions of the fire grate 1, thereby achieving full mixing of the gas and the secondary air and improving the combustion efficiency.

[0098] After the secondary air enters the housing 2 through the second ventilation opening 202 , it enters the secondary air duct formed between the fire bars 1 , and the secondary air flows along the secondary air duct to the air outlet of the fire bar 1 .

[0099] In some embodiments, the bottom of the shell 2 forms a bending surface, and the bending surface matches the lower contour of the fire bar 1; the second ventilation opening 202 is opened on the bending surface.

[0100] Specifically, for the fire bar 1, the top thereof is usually relatively flat due to the configuration of the air outlet holes, while the bottom of the fire bar 1 has a height difference due to the profile design. Therefore, in order to ensure that the airflow entering the housing 2 through different second vents 202 can quickly enter the corresponding part of the secondary air duct, the bottom of the housing 2 is designed as a bent surface so that the bent surface matches the bottom contour of the fire bar 1, thereby reducing the formation of a large spacing space at the bottom of the fire bar 1 and affecting the air intake of the secondary air duct.

[0101] In one embodiment, the bottom of the fire bar 1 forms an extension portion 101 extending downward, and the extension portion 101 is formed with the introduction section;

[0102] A first overlapping portion 102 is formed between the end of the fire bar 1 away from the injection port of the injection section and the extension portion 101;

[0103] The bending surface has a first mounting surface 203 and a second mounting surface 204, the first mounting surface 203 is higher than the second mounting surface 204, the second vent 202 includes a first sub-vent 2021 and a second sub-vent 2022, the first sub-vent 2021 is formed on the first mounting surface 203, and the second sub-vent 2022 is formed on the second mounting surface 204;

[0104] The first overlapping portion 102 is arranged above the first mounting surface 203 , and the extending portion 101 is arranged above the second mounting surface 204 .

[0105] Specifically, in order to meet the structural design requirements of the press-formed structure, the fire bar 1 is provided with an extension portion 101 at its bottom to form an introduction section. At this time, the end of the fire bar 1 away from the introduction port facilitates the generation of a height difference between the extension portions 101 to form a first overlap portion 102. In order to ensure the air intake, the portion of the secondary air duct in the area between the two first overlap portions 102 of two adjacent fire bars 1 can be formed with a first mounting surface 203 formed on the bent surface to fit tightly against the bottom of the first overlap portion 102. In this way, the installation requirements can be met, and the secondary air introduced by the first sub-air port 2021 on the first mounting surface 203 can directly enter the secondary air duct where the first overlap portion 102 is located to ensure sufficient secondary air supply.

[0106] In another embodiment, a second overlapping portion 103 is formed between the end of the fire bar 1 adjacent to the injection port of the injection section and the extension portion 101;

[0107] The second mounting plate 22 has a third mounting surface 205, the third mounting surface 205 is higher than the second mounting surface 204, and the second mounting surface 204 is located between the first mounting surface 203 and the third mounting surface 205;

[0108] The second vent 202 includes a third sub-vent 2023, and the third sub-vent 2023 is formed on the third mounting surface 205;

[0109] The third overlapping portion is arranged above the third mounting surface 205 .

[0110] Specifically, a second overlap portion 103 is formed corresponding to the end of the fire bar 1 close to the introduction section for installation, and the second overlap portion 103 is overlapped on the third installation surface 205. At the same time, in order to meet the requirement of sufficient secondary air supply at the second overlap portion 103, a third sub-air port 2023 is also provided on the third installation surface 205 of the secondary air duct. The third sub-air port 2023 is adjacent to the bottom of the second overlap portion 103, so that the secondary air introduced by the third sub-air port 2023 can directly enter the secondary air duct. In this way, sufficient secondary air supply can be obtained at each position of the fire bar 1 to improve the mixing uniformity of gas and air, thereby improving the combustion sufficiency of gas.

[0111] In some embodiments, a plurality of first sub-air vents 2021 arranged side by side are provided on the first mounting surface 203, so that secondary air is evenly distributed at the bottom of each fire bar 1 through the plurality of first sub-air vents 2021. The first sub-air vents 2021 may also be designed as strip holes, extending along the length direction of the fire bar 1 and located on one side of the fire bar 1.

[0112] In some embodiments, the second mounting surface 204 is provided with a plurality of second sub-air vents 2022 arranged side by side, the second sub-air vents 2022 are strip-shaped holes, and the second sub-air vents 2022 extend along the length direction of the fire bar 1. Specifically, there may be a plurality of second sub-air vents 2022, and the second sub-air vents 2022 also extend along the length direction of the fire bar 1.

[0113] Alternatively, the second mounting surface 204 is provided with at least one second sub-air port 2022, and the second sub-air port 2022 extends in a length direction perpendicular to the fire bar 1. Specifically, there can be one second sub-air port 2022 and it occupies enough space on the second mounting surface 204 to meet the secondary air intake requirements within a large area of ​​the bottom of multiple rows of fire bars 1.

[0114] In some embodiments, the third mounting surface 205 is provided with a plurality of third sub-air ports 2023 arranged side by side, so as to supply secondary air evenly distributed at the bottom of each fire bar 1 through the plurality of third sub-air ports 2023. The third sub-air ports 2023 may also be designed as strip holes, and the third sub-air ports 2023 extend along the length direction of the fire bar 1.

[0115] By setting a second vent 202 at the bottom of the shell 2, the second vent 202 is arranged at the bottom of the fire grate 1 and can be distributed according to the requirements of secondary ventilation. Therefore, during use, it can ensure that the secondary air at different positions of the fire grate 1 is evenly distributed, so as to improve the uniformity of mixing of gas and air and improve the completeness of gas combustion.

[0116] like Figure 12-Figure 19 As shown, for the fire bar 1, it is necessary to assemble multiple fire bars 1 into the shell 2 in sequence side by side. In order to reduce the use of parts, reduce manufacturing costs and improve assembly efficiency, the following structural improvements are made to the shell 2 and the fire bar 1.

[0117] The housing 2 includes an enclosure and a bottom plate 23. A plurality of first vents 201 are provided on one side wall of the enclosure. Positioning ribs 206 are provided on the inner surface of the enclosure around the periphery of the first vents 201. The bottom plate 23 is provided at the bottom of the enclosure. A plurality of mounting slots 207 are provided on the bottom plate 23. The mounting slots 207 are arranged opposite to the corresponding positioning ribs 206.

[0118] A plurality of fire bars 1 are arranged side by side and set in the housing 2 , the ejection ports of the ejection sections of the fire bars 1 are connected to the corresponding positioning ribs 206 , and the fire bars 1 are also stuck in the corresponding mounting slots 207 .

[0119] The positioning rib 206 is a ring-shaped structure, and the positioning rib 206 is inserted into the injection port.

[0120] Specifically, during the assembly process, the ejection ports of multiple fire bars 1 are connected together with the positioning ribs 206 to position the ejection ports of the fire bars 1 through the positioning ribs 206, and then the ends of the fire bars 1 away from the positioning ribs 206 are clamped in the positioning slots 208. In this way, the fire bars 1 can be installed using only the assembly structure in the outer shell 2, and there is no need to additionally configure an independent mounting frame to install the fire bars 1, thereby reducing the number of parts and improving assembly efficiency.

[0121] In some embodiments, the enclosure includes a first mounting plate 21 and a second mounting plate 22, the cross section of the first mounting plate 21 is a U-shaped structure, the second mounting plate 22 is connected between two ends of the first mounting plate 21, and the bottom plate 23 is arranged at the bottom of the second mounting plate 22;

[0122] The first vent 201 and the positioning rib 206 are disposed on the second mounting plate 22 .

[0123] Specifically, the enclosure is a split structure, the first mounting plate 21 is a semi-enclosed structure, and the second mounting plate 22 is provided with a first vent 201 to meet the intake requirements of the fuel gas and primary air.

[0124] In another embodiment, the housing 2 further comprises an inner lining plate 24, and the inner lining plate 24 is disposed on the inner wall of the first mounting plate 21 and arranged outside the fire bar 1;

[0125] A positioning portion extending toward the second mounting plate 22 is provided on the inner lining plate 24 at a position opposite to the second mounting plate 22, and a plurality of positioning slots 208 are provided at the edge of the positioning portion;

[0126] The fire bar 1 is clamped in the corresponding positioning slot 208 .

[0127] Specifically, in order to reduce the heat transfer from the outer shell 2 to the outside when the fire grate 1 is burning, an inner lining plate 24 is provided in the outer shell 2 for heat insulation, and an air layer is formed between the inner lining plate 24 and the outer shell 2 to play a role of heat insulation.

[0128] Furthermore, by further providing a positioning slot 208 on the inner lining plate 24 , the positioning slot 208 can position the end of the fire bar 1 away from the injection port, thereby more effectively improving the installation accuracy and reliability of the fire bar 1 .

[0129] In some embodiments, in order to facilitate the installation of the inner lining plate 24 on the outer shell 2, a positioning tongue 211 extending inward and upward is further provided on the first mounting plate 21, and the lower edge of the inner lining plate 24 is clamped between the positioning tongue 211 and the first mounting plate 21.

[0130] Specifically, when installing the inner lining plate 24, the inner lining plate 24 is placed on the inner side of the first mounting plate 21 and pre-positioned and supported by the positioning tongue 211, and then the upper part of the inner lining plate 24 can be fixedly connected to the first mounting plate 21 by reducing screws.

[0131] In another embodiment, the positioning rib 206 , the installation slot 207 and the positioning slot 208 connected and matched with the same fire bar 1 are arranged in sequence.

[0132] Specifically, after the fire bar 1 is assembled in place, the two ends of the fire bar 1 will be limited and fixed by the positioning ribs 206 and the positioning slots 208, and the bottom of the fire bar 1 can be further supported and fixed by the installation slots 207, so that the fire bar 1 can be securely assembled into the shell 2.

[0133] The positioning slot 208 is arranged obliquely above the installation slot 207 .

[0134] In another embodiment, a second ventilation opening 202 is disposed on the bottom plate 23 to meet the supply requirement of secondary air through the second ventilation opening 202 .

[0135] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A fire bar, wherein the fire bar is provided with an injection port and a plurality of main fire holes, and an air supply channel is further provided inside the fire bar, wherein the air supply channel has an air intake section, a curved section and a distribution section connected in sequence, the injection port is connected to the air intake section, and the plurality of main fire holes are arranged side by side along the length direction of the distribution section, characterized in that: A first throttling protrusion and a second throttling protrusion are also provided inside the fire bar. The first throttling protrusion is arranged on the outside of the curved section, and the second throttling protrusion is arranged on the outside of the first throttling protrusion and extends along the length direction of the distribution section.

2. The fire bar according to claim 1, characterized in that: The first throttling protrusion is in an arc shape as a whole and extends along the bending direction of the bending section.

3. The fire bar according to claim 1, characterized in that: A diversion chamber is arranged inside the fire grate on the outside of the curved section, and the diversion chamber is communicated with the curved section of the air supply channel.

4. The fire bar according to claim 3, characterized in that: The first throttling protrusion is arranged at a position where the diversion chamber is connected to the curved section of the air supply channel.

5. The fire bar according to claim 3, characterized in that: The second throttling protrusion is in a strip-shaped structure and is arranged transversely in the diversion chamber.

6. The fire bar according to claim 5, characterized in that: A combustion channel and a gradually widening channel are also provided in the fire grate. The combustion channel, the gradually widening channel and the distribution section all extend along the length direction of the fire grate. The combustion channel and the gradually widening channel are arranged side by side and are interconnected. The diversion chamber and the distribution section are respectively connected to the gradually widening channel. The gradually widening channel gradually widens along the direction in which the airflow enters the combustion channel, and the main fire hole is connected to the combustion channel.

7. A burner comprising a housing and a plurality of fire bars, characterized in that: The fire bar is the fire bar as claimed in any one of claims 1 to 6, and a plurality of the fire bars are arranged side by side and disposed in the housing.

8. The burner according to claim 7, characterized in that A side wall of the shell is provided with a plurality of first vents, the plurality of first vents are arranged side by side, and a lower portion of the shell is further provided with at least one second vent; A secondary air duct is formed between two adjacent fire bars, the induced section of the fire bar is connected to the corresponding first ventilation port, the fire bar is arranged above the second ventilation port, and the secondary air duct is communicated with the second ventilation port.

9. The burner according to claim 8, characterized in that The housing comprises an enclosure and a bottom plate, a first vent is provided on one side wall of the enclosure, and positioning ribs are provided on the inner surface of the enclosure around the outer periphery of the first vent; The bottom plate is provided with the second vent, the bottom plate is provided at the bottom of the enclosure, and a plurality of mounting slots are provided on the bottom plate, and the mounting slots are arranged opposite to the corresponding positioning ribs; The ejection port of the fire bar is connected to the corresponding positioning rib, and the fire bar is also stuck in the corresponding installation slot.

10. A gas water heater, comprising a casing, characterized in that: It also includes a burner as described in any one of claims 7 to 9, wherein the burner is located in the casing.

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