Combustor, combustor device and gas water heater

Abstract

The invention belongs to the technical field of gas water heaters, and discloses a combustor, a combustor device and a gas water heater, the combustor comprises a combustor shell, a plurality of guide plates and a fire grate, the guide plates are fixed in the combustor shell, and a premixing runner is formed in the combustor shell; the fire grate comprises a fire grate body and a plurality of first fire outlet structures arranged on the fire grate body at intervals, protrusions are arranged on the fire grate body, first fire outlet holes communicated with the premixing flow channel are formed in the protrusions, the diameter of the first fire outlet holes is smaller than the quenching diameter of fuel gas, and the protrusions and the first fire outlet holes form the first fire outlet structures. The first fire outlet holes extend in the height direction, the distance between flames above the protrusions and airflow below the fire grate body is lengthened, when the airflow speed is decreased, the lengthened distance can effectively prevent the backfire phenomenon from occurring, the burner can still work stably under the condition of low load, the water temperature adjusting range is widened, and the service life of the burner is prolonged. And the use requirement of a user on a wider temperature range is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas water heaters, in particular to a burner, a burner device and a gas water heater. BACKGROUND

[0002] A gas water heater is a gas appliance that uses gas as fuel to heat water. The gas water heater mainly includes a burner, a heat exchanger, a gas supply device and a water supply device. On the one hand, the gas supply device is used to supply air and gas to the burner, and when the air and gas are mixed and ignited in the burner, the heat exchanger can be heated. On the other hand, the water supply device is used to supply cold water into the heat exchanger, and the heated water in the heat exchanger can be supplied to the water system to meet the user's demand.

[0003] The burner in the related art includes a burner shell and a fire grate. A premixing cavity is arranged in the burner shell, and the fire grate is installed on the top of the burner shell. When the burner works, the variable frequency fan is used to inject the gas and air according to the pre-calculated air-gas ratio to ensure that the air and gas are fully mixed in the premixing cavity, and finally the mixed gas is discharged through the fire grate and ignited and burned. The load adjustment of the burner is mainly based on the change of the rotating speed of the variable frequency fan to control the supply amount of the mixed gas.

[0004] However, such a structure has an inherent bottleneck: when the load of the burner is adjusted to be low, the air flow speed will be reduced to below the flame propagation speed, at which time the fire grate is prone to backfire, which seriously restricts the stable working range of the burner. This technical bottleneck directly leads to the difficulty of further reducing the minimum heat load of the gas water heater, limits the adjustment range of the water temperature, and is difficult to meet the user's demand for wider temperature range and more precise water temperature control.

[0005] This part provides background information related to the present application, which may not be prior art. SUMMARY

[0006] The present application aims to solve or at least alleviate part or all of the above problems. To this end, the present application aims to provide a burner, a burner device and a gas water heater, which can avoid backfire phenomenon when the load of the burner is adjusted to be low by optimizing the structure of the burner, which is beneficial to widen the adjustment range of the water temperature and meet the user's demand for wider temperature range and more precise water temperature control.

[0007] In order to achieve the above-mentioned target, the present application adopts the following technical solution:

[0008] In a first aspect, the present application provides a burner, comprising:

[0009] a burner shell;

[0010] a plurality of flow guide plates fixed in the burner housing and forming a premix flow channel in the burner housing;

[0011] a fire grate fixed on the top of the burner housing and above the premix flow channel, the fire grate comprising a fire grate body and a plurality of first fire outlets arranged on the fire grate body;

[0012] wherein the fire grate body is provided with a protrusion, the protrusion is provided with a first fire outlet hole communicating with the premix flow channel, the diameter of the first fire outlet hole is smaller than the quenching diameter of the gas, and the protrusion and the first fire outlet hole form the first fire outlet structure.

[0013] As an optional solution of the burner, the fire grate further comprises a second fire outlet structure, the second fire outlet structure is arranged between two adjacent first fire outlet structures, wherein the fire grate body is provided with a second fire outlet hole, and the fire grate body is provided with a shielding piece arranged above the second fire outlet hole at intervals, and the distance between the shielding piece and the fire grate body is smaller than the distance between the protrusion and the fire grate body, and the shielding piece and the second fire outlet hole form the second fire outlet structure.

[0014] As an optional solution of the burner, a plurality of first fire outlet structures arranged at intervals in a first direction form a first fire outlet structure group, and a plurality of first fire outlet structure groups are arranged at intervals in a second direction; a plurality of second fire outlet structures arranged at intervals in the first direction are arranged between two adjacent first fire outlet structure groups, and the hole area of the second fire outlet hole of the second fire outlet structure located at the middle position in the first direction is larger than the hole area of the second fire outlet hole of the second fire outlet structure at other positions.

[0015] As an optional solution of the burner, the diameter of the first fire outlet hole gradually decreases from the direction of the fire grate body to the direction away from the fire grate body;

[0016] And / or, the second fire outlet hole is a rectangular hole, and the length direction of the second fire outlet hole extends along the first direction.

[0017] As an optional solution of the burner, the protrusion is a circular truncated cone, and the diameter of the protrusion gradually decreases from the direction of the fire grate body to the direction away from the fire grate body.

[0018] As an optional solution of the burner, the burner further comprises a flow uniformizing plate, the top of the burner housing is provided with a flange, the flow uniformizing plate and the fire grate are fixed to the flange, and the flow uniformizing plate is located below the fire grate, and the flow uniformizing plate is provided with a plurality of flow uniformizing holes arranged at intervals.

[0019] As an alternative to the burner, the fire row body comprises an opening part and a fixed part surrounding the opening part, the opening part protrudes away from the flow uniformizing plate relative to the fixed part, and the opening part is used to arrange the first fire outlet structure and the second fire outlet structure, and the fixed part is used to be fixedly connected with the burner shell.

[0020] As an alternative to the burner, the distance between the opening part and the flow uniformizing plate increases first and then decreases along the first direction.

[0021] In a second aspect, the application provides a burner device, comprising a shell and a burner as described above, the burner is fixed in the shell and divides the internal space of the shell into an upper cavity and a lower cavity arranged in an upper-lower direction, the upper cavity forms a combustion chamber, and the lower cavity forms an air buffer cavity.

[0022] In a third aspect, the application provides a gas water heater, comprising a fan, a gas proportional valve and a burner device as described above, the fan is used to supply air to the burner device, and the gas proportional valve is configured to be connected with a gas pipeline and is used to supply gas to the burner device.

[0023] The application has the following beneficial effects:

[0024] The burner provided by the application comprises a burner shell, a flow guide plate and a fire row, a plurality of flow guide plates are fixed in the burner shell and form a premix flow channel inside the burner shell, the fire row comprises a fire row body and a plurality of first fire outlet structures arranged at intervals on the fire row body, a protrusion is arranged on the fire row body, a first fire outlet hole communicating with the premix flow channel is arranged on the protrusion, the diameter of the first fire outlet hole is smaller than the quenching diameter of the gas, the protrusion and the first fire outlet hole form the first fire outlet structure, the first fire outlet hole extends along the height direction, the distance between the flame above the protrusion and the airflow below the fire row body is lengthened, when the airflow speed decreases, the lengthened distance can effectively prevent the backfire phenomenon from occurring, so that the burner can still work stably under a low load, thereby widening the water temperature adjustment range and meeting the use requirements of users for a wider temperature range and more precise water temperature control.

[0025] The burner device and the gas water heater provided by the application can avoid the backfire phenomenon under the condition that the load of the burner is adjusted to be low by applying the above-mentioned burner, which is beneficial to widening the water temperature adjustment range and meeting the use requirements of users for a wider temperature range and more precise water temperature control. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structure diagram of the front of a gas water heater hidden cabinet provided by an embodiment of the application.

[0027] Figure 2is a longitudinal sectional view of a burner device provided by an embodiment of the present application.

[0028] Figure 3 is a longitudinal sectional view of a burner provided by an embodiment of the present application.

[0029] Figure 4 is a partial structural view of a fire grate of one example provided by an embodiment of the present application.

[0030] Figure 5 is a partial structural view of a fire grate of another example provided by an embodiment of the present application.

[0031] Figure 6 is a longitudinal sectional view of a fire grate. Figure 5

[0032] Figure 7 is an exploded view of a burner of one example provided by an embodiment of the present application.

[0033] Figure 8 is an exploded view of a burner of another example provided by an embodiment of the present application.

[0034] Figure 9 is an exploded view of a first flow guide plate, a baffle plate and a second flow guide plate provided by an embodiment of the present application.

[0035] Figure 10 is a structural view of a baffle plate provided by an embodiment of the present application.

[0036] Figure 11 is a structural view of a baffle plate, a burner shell and a flow guide plate in an assembled state provided by an embodiment of the present application.

[0037] in the figure:

[0038] 100, a casing; 200, a burner device; 201, an outer shell; 2011, an air buffer cavity; 2012, a combustion chamber; 2013, an air supply interface; 202, a burner; 203, a gas distributor; 2031, a gas distribution inlet; 2032, a gas distribution outlet; 204, an ignition assembly; 300, a heat exchanger; 400, a fan; 500, a gas proportional valve; 601, a water inlet connector; 602, a water inlet pipeline; 603, a water outlet connector; 604, a water outlet pipeline; 605, a water quantity server; 700, a gas inlet connector; 800, a control system; 801, a main control board; 802, an electrical element; 901, a smoke collection cover; 902, a smoke exhaust pipe;

[0039] 1, a burner shell; 10, a premix flow channel; 101, an air premix inlet; 102, a gas premix inlet; 103, a mixed gas outlet; 11, a rear side wall; 12, a left side wall; 13, a front side wall; 132, a containing groove; 14, a right side wall; ​

[0040] 2, deflector; 21, first deflector; 211, first upper slit; 212, first lower slit; 22, second deflector; 221, second slit; 3, flow equalizer; 31, flow equalizing hole;

[0041] 4, fire grate; 41, fire grate body; 411, opening part; 412, fixing part; 42, first fire outlet structure; 421, protrusion; 422, first fire outlet hole; 43, second fire outlet structure; 431, second fire outlet hole; 432, shielding piece; 44, fire guide hole;

[0042] 5, partition plate; 51, first limiting assembly; 511, first upper limiting protrusion; 512, first lower limiting protrusion; 52, second limiting assembly; 521, second upper limiting protrusion; 522, second lower limiting protrusion; 53, first insertion protrusion; 54, second insertion protrusion. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0044] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the description of the present application, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0046] The technical solutions of the present application are further illustrated below by specific embodiments in conjunction with the accompanying drawings.

[0047] As Figures 1 to 2As shown, the present application provides a gas water heater, which is a gas appliance that uses gas as fuel to heat water through combustion.

[0048] For the convenience of description, in Figure 1 and Figure 2 , the orientation of the gas water heater is taken as the reference, Figure 1 and Figure 2 , the up and down of the gas water heater are the up and down in the height direction of the gas water heater, Figure 1 , the left and right of the gas water heater are the left and right sides of the gas water heater, Figure 1 , the side of the gas water heater shown in Figure 2 is the front side of the gas water heater (the front of Figure 2 ), and the side opposite to the front side is the back side of the gas water heater (the back of ). It should be noted that the orientation definition is mainly for the convenience of describing the technical solutions of the present application, and cannot be used as a limitation on the technical solutions of the present application.

[0049] As shown in Figure 1 , the gas water heater provided by the present application comprises a casing 100, a burner device 200, a heat exchanger 300, a fan 400 and a gas proportional valve 500, wherein the casing 100 has a receiving cavity therein, the burner device 200, the heat exchanger 300, the fan 400 and the gas proportional valve 500 are all installed in the receiving cavity, the burner device 200 has an air supply interface 2013 and a gas supply interface, the heat exchanger 300 is located above the burner device 200, the fan 400 and the gas proportional valve 500 are arranged side by side along the left-right direction and are located below the burner device 200, the air outlet of the fan 400 is connected with the air supply interface 2013 and is used to control the supply amount of air, and the gas proportional valve 500 is used to connect a gas pipeline and the gas supply interface and control the supply amount of gas. With such an orientation arrangement, the internal space of the receiving cavity can be fully utilized, the space utilization rate is improved, the structure of the gas water heater is more compact, the volume is smaller, the space occupation is reduced, and the gas water heater is suitable for smaller installation spaces.

[0050] The working principle of the gas water heater is as follows: the fan 400 provides air to the burner device 200, the gas in the gas pipeline enters the burner device 200 through the gas proportional valve 500, the gas is ignited and burned after being mixed with the air, the flame of the combustion heats the heat exchanger 300, so that the cold water in the heat exchanger 300 is heated to the required temperature to meet the water demand of the user. In other words, the fan 400 and the gas proportional valve 500 constitute the gas supply device in the related art.

[0051] In addition, the gas water heater further comprises a water inlet joint 601 and a water outlet joint 603. The water inlet joint 601 is fixed to the bottom wall of the shell 100 and connected to the water inlet of the heat exchanger 300 through a water inlet pipeline 602. The water outlet joint 603 is fixed to the bottom wall of the shell 100 and connected to the water outlet of the heat exchanger 300 through a water outlet pipeline 604. The water outlet pipeline 604 and the water inlet pipeline 602 are respectively located on the left and right sides of the heat exchanger 300, so as to fully utilize the space of the accommodating cavity of the shell 100.

[0052] In some embodiments, the gas water heater further comprises a water quantity servo 605. The water quantity servo 605 is used to accurately control the water quantity flowing into the heat exchanger 300, so as to solve the problem of temperature fluctuation of the gas water heater.

[0053] Further, the gas water heater further comprises a gas inlet joint 700. The gas inlet joint 700 is fixed to the bottom wall of the shell 100 and used to be connected with the gas proportional valve 500 and located between the water inlet joint 601 and the water outlet joint 603. This arrangement not only fully utilizes the space of the bottom wall of the shell 100, but also shortens the distance between the gas inlet joint 700 and the gas proportional valve 500 and the length of the connecting pipeline therebetween, thereby reducing the material cost and the space occupation of the connecting pipeline in the accommodating cavity.

[0054] In some embodiments, the gas water heater further comprises a control system 800. The control system 800 comprises a main control board 801 and an electrical element 802. The main control board 801 is fixed to the accommodating cavity and located on the side of the heat exchanger 300 adjacent to the water inlet pipeline 602. The electrical element 802 is fixed to the surface of the main control board 801 away from the heat exchanger 300. This arrangement not only fully utilizes the space of the accommodating cavity of the shell 100, but also sets the main control board 801 adjacent to the water inlet pipeline 602 with lower temperature, thereby being away from the water outlet pipeline 604 with higher temperature, reducing the influence of the water temperature of the water outlet pipeline 604 on the main control board 801, and at the same time, the cold water in the water inlet pipeline 602 can radiate cold to the main control board 801 to some extent. When the temperature of the main control board 801 is high, the heat of the main control board 801 is radiated to the direction of the water inlet pipeline 602, which is beneficial to heat dissipation of the main control board 801.

[0055] Further, the main control board 801 is fixed to the upper right of the accommodating cavity. The height dimension of the main control board 801 is greater than the height dimension of the heat exchanger 300. The main control board 801 is located on the right side of the heat exchanger 300 and extends to the position opposite to the burner device 200, i.e. the main control board 801 is arranged on the left and right sides of the heat exchanger 300 and the burner device 200.

[0056] In order to exhaust the exhaust gas generated by the gas combustion, the gas water heater further comprises a smoke hood 901 and a smoke exhaust pipe 902, the smoke exhaust pipe 902 is used for connecting the public smoke exhaust system pipeline and the smoke hood 901, the smoke hood 901 is arranged above the heat exchanger 300 and is used for concentrating the exhaust gas, so as to ensure that all the exhaust gas can be exhausted from the smoke exhaust pipe 902 to the public smoke exhaust system pipeline, reduce or even avoid the smoke leakage problem, and improve the user experience.

[0057] It is worth noting that the heat exchanger 300, the fan 400, the gas proportional valve 500 and the water quantity server 605 in the present application can all be selected from existing conventional products, and will not be described here.

[0058] In addition, in addition to the reasonable layout of the positions of the various components described above, the structure of the burner device 200 can also be optimized, so that the burner device 200 is more compact and smaller in size, so as to realize smaller size of the whole gas water heater and meet the market demand of smaller installation space. Next, the specific structure of the burner device 200 will be introduced.

[0059] As shown in Figure 2 The burner device 200 comprises a shell 201, a burner 202 and a gas distributor 203, wherein the burner 202 and the gas distributor 203 are both mounted in the shell 201. The bottom of the shell 201 has an air supply interface 2013, the burner 202 is fixed in the shell 201 and divides the internal space of the shell 201 into an upper cavity and a lower cavity arranged in sequence, the upper cavity forms a combustion chamber 2012, and the lower cavity forms an air buffer cavity 2011, which is in communication with the air supply interface 2013. This design directly forms the air supply interface 2013 at the bottom of the shell 201, and forms the air buffer cavity 2011 and the combustion chamber 2012 in the shell 201, and the shell 201 can also be used as the mounting base of the burner 202, so that the whole structure of the burner device 200 is more compact and smaller in size.

[0060] The gas distributor 203 has a gas distribution inlet 2031 and a gas distribution outlet 2032, the gas distribution outlet 2032 is connected with the gas premixing inlet 102, and the gas distribution inlet 2031 forms a gas supply interface and is in communication with the gas proportional valve 500. When it is necessary to supply gas, the gas proportional valve 500 is opened, the gas in the gas pipeline enters the gas distributor 203 through the gas proportional valve 500 and the gas distribution inlet 2031, and then enters the premixing flow channel 10 through the gas distribution outlet 2032 and the gas premixing inlet 102.

[0061] The front side of the combustor 202 is provided with a receiving groove 132, and the front side of the shell 201 has a corresponding avoiding notch corresponding to the receiving groove 132. The gas distributor 203 is fixed to the shell 201 and covers the avoiding notch, and part of the gas distributor 203 is located in the receiving groove 132. In this way, the overall structure of the combustor device 200 is more compact, smaller and more regular, and the space utilization of the accommodating cavity of the cabinet 100 can be improved.

[0062] In addition, compared with installing the gas distributor 203 below the combustor 202, this layout scheme can reduce the size of the combustor device 200 in the height direction, and after the gas distributor 203 is installed behind the combustor 202, the outer surface of the gas distributor 203 is substantially flush with the outer surface of the shell 201. It is convenient to install the entire combustor device 200 in the accommodating cavity of the cabinet 100, and it is also conducive to the flat appearance of the gas water heater, and it is convenient to install the gas water heater on a flat wall or a flat cabinet surface.

[0063] The combustor device 200 further comprises an ignition assembly 204, which is fixed to the shell 201, and part of the ignition assembly 204 is located in the combustion chamber 2012. The ignition assembly 204 is used to ignite the gas entering the combustion chamber 2012. It should be noted that the ignition assembly 204 can be selected from conventional ignition products, which will not be described here.

[0064] As shown in Figure 3 The combustor 202 provided by the present application comprises a combustor shell 1, a flow guide plate 2 and a fire grate 4. A plurality of flow guide plates 2 are fixed in the combustor shell 1 and form a premixing flow channel 10 in the combustor shell 1. The fire grate 4 is fixed to the top of the combustor shell 1 and located above the premixing flow channel 10. The premixing flow channel 10 has an air premixing inlet 101 and a gas premixing inlet 102. After the air and gas enter the premixing flow channel 10, they are discharged from the fire grate 4 and ignited and burned.

[0065] In the related art, when the load of the combustor 202 is reduced, the gas flow rate will be reduced to below the flame propagation speed. At this time, backfire is prone to occur at the fire grate 4, which seriously restricts the stable working range of the combustor 202 and directly leads to the difficulty of further reducing the minimum heat load of the gas water heater, limiting the water temperature adjustment range and being difficult to meet the user's use demand for wider temperature range and more precise water temperature control.

[0066] Based on the above problems, the combustor 202 provided by the present application can avoid backfire under low load of the combustor 202 by optimizing the flow path of the premixing flow channel 10 inside the combustor 202 and the structure of the fire grate 4, which is conducive to widening the water temperature adjustment range and meeting the user's use demand for wider temperature range and more precise water temperature control.

[0067] Continue asFigures 3 to 4 As shown, the fire row 4 comprises a fire row body 41 and a first fire outlet structure 42, a plurality of first fire outlet structures 42 arranged in a first direction form a first fire outlet structure group, and a plurality of first fire outlet structure groups are arranged in a second direction; wherein the fire row body 41 is provided with a protrusion 421, the protrusion 421 is provided with a first fire outlet hole 422 communicating with the premix flow channel 10, the diameter of the first fire outlet hole 422 is smaller than the quenching diameter of the gas, and the protrusion 421 and the first fire outlet hole 422 form the first fire outlet structure 42, so that the first fire outlet structure 42 has a certain height from the fire row body 41. Compared with the scheme of directly opening the fire hole on the fire row body 41, the first fire outlet hole 422 extends in the height direction, not only plays a certain guiding role to the mixed gas flow, but also lengthens the distance between the flame above the protrusion 421 and the mixed gas flow below the fire row body 41. When the mixed gas flow speed decreases, the lengthened distance can effectively prevent backfire from occurring, so that the burner 202 can still work stably under low load, widen the water temperature adjustment range, and meet the use demand of users for wider temperature range and more precise water temperature control.

[0068] In some embodiments, the plurality of first fire outlet structures 42 are uniformly and densely arranged on the fire row body 41, the first fire outlet hole 422 of the first fire outlet structure 42 is smaller than the quenching diameter of the gas, which can effectively prevent backfire; when the flame has a tendency to spread inward, it will be extinguished when passing through the first fire outlet hole 422 due to the cooling of the hole wall of the first fire outlet hole 422. In addition, this design makes the combustion flame very short and close to the surface of the fire row body 41, forming a uniform fire film and achieving a flameless combustion state. This combustion method has uniform temperature distribution, can avoid the generation of local high-temperature points, and can increase the combustion specific surface area to provide multiple outlets for the gas-air mixture, so that it can be completely combusted instantaneously. The large combustion area not only ensures sufficient combustion of the gas and significantly reduces the generation of carbon monoxide, but also avoids the emission of nitrides due to the absence of local high temperatures, and the heat can be quickly transferred to the heating surface, greatly reducing the loss of heat carried by high-temperature flue gas escaping, thereby significantly improving the thermal efficiency.

[0069] It should be noted that, in the Figures 3 to 4 In the example, the first direction is the front-rear direction of the burner 202, and the second direction is the left-right direction of the burner 202. In other embodiments, the first direction can also be the left-right direction of the burner 202, and the second direction is the front-rear direction of the burner 202. The directions are defined only for the convenience of understanding the technical solutions of the present application, and do not limit the technical solutions.

[0070] In the Figure 3In the shown example, several deflectors 2 are fixed in the burner housing 1 and form a premix flow channel 10 with an S-shaped flow path in the burner housing 1, the premix flow channel 10 has an air premix inlet 101 at the bottom starting end of the premix flow channel 10 and a gas premix inlet 102 at the S-shaped turning of the premix flow channel 10, and the top terminal of the premix flow channel 10 forms a mixed gas outlet 103 for discharging the mixed gas of air and gas. The gas enters the premix flow channel 10 from the gas premix inlet 102, and the air and gas are fully mixed in the S-shaped premix flow channel 10. The S-shaped premix flow channel 10 cooperates with the first fire structure 42 of the fire plate 4, so that the fully mixed gas flows out of the first fire hole 422 of the first fire structure 42, which can effectively improve the combustion efficiency of the gas, reduce the generation of carbon monoxide and nitrogen monoxide, and ensure the full combustion of the gas.

[0071] In addition, the S-shaped premix flow channel 10 can build a premix flow channel 10 with a longer flow path in a smaller height space, thereby reducing the size of the burner housing 1 in the height direction to some extent, making the structure of the burner 202 more compact and smaller. Or it can extend the mixing path of the gas and air without increasing the volume of the burner housing 1, ensuring that the two are fully mixed and improving the combustion efficiency.

[0072] The burner device 200 provided by the present application optimizes the structure of the burner 202, so that the gas is fully mixed with the air in the premix flow channel 10 before entering the combustion chamber 2012, forming a uniform mixed gas for combustion, greatly improving the combustion efficiency, and through the special design of the fire plate 4, it has the advantages of preventing backfire, low combustion noise, low carbon monoxide and nitrogen monoxide emission, etc.

[0073] Further, the air premix inlet 101 is in communication with the air buffer cavity 2011, the air buffer cavity 2011 is in communication with the air supply interface 2013, and the fan 400 is connected to the air supply interface 2013. When air supply is needed, the fan 400 is started to supply air from the outside environment into the air buffer cavity 2011, and the air in the air buffer cavity 2011 enters the premix flow channel 10 through the air premix inlet 101. In actual work, the gas water heater can control the air supply amount through the fan 400 and control the gas supply amount through the gas proportional valve 500, so that the gas and air are fully mixed in the premix flow channel 10 according to the preset air-fuel ratio. The mixed combustible gas is discharged through the first fire structure 42 of the fire plate 4 and burns evenly on the surface of the fire plate 4, which can significantly improve the thermal efficiency and emission performance of the gas water heater.

[0074] In some embodiments, the plurality of guide vanes 2 include a first guide vane 21 and a second guide vane 22. Both the first guide vane 21 and the second guide vane 22 are generally C-shaped, and together they form an S-shaped flow path within the burner housing 1, which can extend the mixing path of air and gas in a limited space and ensure that the gas and air can be fully mixed.

[0075] In other embodiments, such as Figure 5 As shown, the fire rack 4 also includes a second fire outlet structure 43. The second fire outlet structure 43 is provided between two adjacent groups of first fire outlet structures. The fire rack body 41 is provided with a second fire outlet hole 431, and the fire rack body 41 is provided with a blocking member 432 that blocks the second fire outlet hole 431 at intervals. The distance between the blocking member 432 and the fire rack body 41 is less than the distance between the protrusion 421 and the fire rack body 41. The blocking member 432 and the second fire outlet hole 431 form the second fire outlet structure 43. When the mixed gas inside the burner housing 1 is ejected from the second flame outlet 431 and ignited, the flame at that location mainly spreads to both sides under the action of the shielding member 432. When it spreads to the wall of the adjacent protrusion 421, it is blocked, thereby connecting the flames of the first flame outlet 422 at each protrusion 421 and forming a continuous and uniform flame layer on the entire surface of the burner body 41. The flame height is low, and it burns close to the surface of the burner body 41, forming a uniform fire film, achieving a state similar to flameless combustion.

[0076] This low-flame combustion not only ensures uniform temperature distribution, preventing localized high-temperature spots, but also, because the flame root is stable at the outlet of the flame port, the outflow velocity of combustible gas is always higher than the flame propagation velocity, preventing the flame from backfiring into the firebox 4 and fundamentally eliminating the risk of backfire. Furthermore, the lower flame allows for a more compact design of the combustion chamber 2012, eliminating the need to reserve excessive space for a tall flame, thus contributing to overall miniaturization. At the same time, the stable flame combustion surface avoids violent flame shaking and turbulence, making the combustion process smoother and quieter, significantly reducing combustion noise.

[0077] Continue as Figure 5 As shown, multiple second flame outlet structures 43 are arranged at intervals along a first direction between two adjacent groups of first flame outlet structures. The area of ​​the second flame outlet hole 431 of the second flame outlet structure 43 located in the middle position along the first direction is larger than the area of ​​the second flame outlet holes 431 in the other positions. In other words, the area of ​​the second flame outlet hole 431 located in the middle position along the first direction is larger than the area of ​​the other second flame outlet holes 431. This is because the gas flow rate in the middle position along the first direction is greater than the gas flow rate in the edge region. Matching a second flame outlet hole 431 with a larger area here facilitates a balanced and stable gas flow, ensuring stable flame combustion.

[0078] In Figure 5 In the example shown, the second fire outlet hole 431 is a rectangular hole, and the length direction of the second fire outlet hole 431 extends along the first direction. In this way, one second fire outlet hole 431 can correspond to multiple first fire outlet holes 422 arranged along the first direction at the same time, which not only reduces the number of second fire outlet structures 43, but also allows the second fire outlet hole 431 to have a larger hole area, thereby providing a larger outflow gap for the gas flow to ensure stable combustion of the flame.

[0079] In addition, the fire row body 41 is also provided with a pilot hole 44, which is arranged opposite to the ignition assembly 204, and the ignition assembly 204 preferentially ignites the gas at the pilot hole 44.

[0080] In some embodiments, as Figure 6 shown, the diameter of the first fire outlet hole 422 gradually decreases from the direction in which the fire row body 41 is located to the direction away from the fire row body 41. In other words, the diameter of the inlet of the first fire outlet hole 422 is larger than the diameter of the outlet of the first fire outlet hole 422, which can facilitate the gas flow to quickly enter the first fire outlet hole 422 from the inlet of the first fire outlet hole 422 and be accelerated to be discharged at the outlet of the first fire outlet hole 422 under the conical guiding action of the first fire outlet hole 422, so that the outflow speed of the gas flow is greater than the flame burning speed, which not only plays an important role in stabilizing the flame, but also prevents backfire. Exemplarily, the diameter of the outlet of the first fire outlet hole 422 is 0.5 mm, and the diameter of the inlet of the first fire outlet hole 422 is 0.55 mm, which helps to accelerate the outflow of the gas.

[0081] Further, the protrusion 421 is a circular truncated cone, and the diameter of the protrusion 421 gradually decreases from the direction in which the fire row body 41 is located to the direction away from the fire row body 41. The shape of the protrusion 421 can block and guide the flame generated by the adjacent protrusion 421 and the second fire outlet structure 43, so as to form a stable low-flame combustion state.

[0082] In some embodiments, the number of first fire outlet structures 42 in a group of first fire outlet structures is 10, and 16 groups of first fire outlet structures are arranged on the fire row body 41, and 4 second fire outlet structures 43 are arranged between adjacent two groups of first fire outlet structures, and the 4 second fire outlet structures 43 are arranged at intervals along the first direction, wherein the hole area of the second fire outlet hole 431 of the two middle second fire outlet structures 43 is greater than the hole area of the second fire outlet hole 431 of the other two second fire outlet structures 43.

[0083] As Figure 7 In combination Figure 3As shown, the burner 202 further comprises a flow uniformizing plate 3, the top of the burner shell 1 is provided with a flange, the flow uniformizing plate 3 and the fire grate 4 are both fixed to the flange, and the flow uniformizing plate 3 is located below the fire grate 4. The flow uniformizing plate 3 is provided with a plurality of flow uniformizing holes 31 arranged at intervals. The mixed gas of gas and air can be further uniformly diffused under the action of the flow uniformizing holes 31, so as to reduce the difference in gas flow rate at each position on the surface of the fire grate 4, thereby ensuring the stability of combustion. In addition, by providing the flange on the top of the burner shell 1, the flow uniformizing plate 3 and the fire grate 4 can be installed on the flange, which can simplify the structure of the burner shell 1, and reasonably arrange the components of the burner 202, so that the overall structure is more compact and the size is smaller.

[0084] Continuing as in 7 Figure 5 As shown, the fire grate body 41 comprises an opening portion 411 and a fixing portion 412 surrounding the periphery of the opening portion 411. The opening portion 411 protrudes away from the flow uniformizing plate 3 relative to the fixing portion 412, and the opening portion 411 is used to arrange the first fire outlet structure 42 and the second fire outlet structure 43. The fixing portion 412 is used to be fixedly connected with the burner shell 1.

[0085] As shown in Figure 6 The distance between the opening portion 411 and the flow uniformizing plate 3 first increases and then decreases along the first direction, that is, the distance between the opening portion 411 and the flow uniformizing plate 3 first increases and then decreases from the front side of the flow uniformizing plate 3 to the rear side thereof. After the mixed gas of gas and air flows out of the premixing flow channel 10, it is preferentially concentrated at the middle position of the flow uniformizing plate 3 in the front-rear direction, so that the mixed gas at this position is more concentrated. In order to ensure that the mixed gas in different regions can smoothly flow out from the flow uniformizing holes 31 and the fire holes, the distance between the opening portion 411 and the flow uniformizing plate 3 first increases and then decreases from the front side of the flow uniformizing plate 3 to the rear side thereof, in other words, the distance between the opening portion 411 at the middle position in the front-rear direction and the flow uniformizing plate 3 is the largest, which can better adapt to the flow of a large amount of mixed gas of gas and air. Exemplarily, the opening portion 411 is approximately arc-shaped.

[0086] In some embodiments, the burner 202 can further comprise or not comprise the partition plate 5, for example, in the example shown in Figure 7 The burner 202 can further not comprise the partition plate 5, that is, the premixing flow channel 10 is an integral flow channel. For another example, in the example shown in Figure 8 The burner 202 comprises one partition plate 5, which is installed in the burner shell 1 and is used to divide the premixing flow channel 10 into two sub-flow channels, which are respectively referred to as a left sub-flow channel and a right sub-flow channel. For another example, in some other embodiments, the number of partition plates 5 can be at least two, and the at least two partition plates 5 are arranged at intervals along the left-right direction to divide the premixing flow channel 10 into at least three sub-flow channels. The number of partition plates 5 can be three, four, five, six, etc., which is not limited herein.

[0087] When the burner 202 comprises the partition plate 5, the premix flow channel 10 is divided into multiple sub-flow channels by the partition plate 5, at this time, the number of air premix inlets 101 is one, and all the sub-flow channels are communicated with the air premix inlet 101; each sub-flow channel has at least one gas premix inlet 102, which ensures that air can enter the sub-flow channel in the working state and the sub-flow channel in the non-working state no matter which sub-flow channel is in the working state, and ensures the overall pressure balance inside the premix flow channel 10.

[0088] The partition plate 5 provided by the application is quickly assembled with the burner shell 1 and the flow guide plate 2 in a plug-in manner, which can improve the assembly efficiency.

[0089] As shown in Figures 9 to 11 , for the assembly between the partition plate 5 and the burner shell 1, the burner shell 1 comprises a rear side wall 11, a left side wall 12, a front side wall 13 and a right side wall 14, the rear side wall 11 has a first insertion slot, the upper part of the first end of the partition plate 5 has a first insertion protrusion 53 matched with the first insertion slot; the front side wall 13 has a second insertion slot, and the second end of the partition plate 5 has a second insertion protrusion 54 matched with the second insertion slot. The rear side wall 11 has one first insertion slot, the upper part of the first end of the partition plate 5 has one first insertion protrusion 53, the upper part and the lower part of the front side wall 13 are both provided with a second insertion slot, and the upper part and the lower part of the second end of the partition plate 5 are both provided with a second insertion protrusion 54.

[0090] For the assembly between the partition plate 5 and the flow guide plate 2, the first flow guide plate 21 is provided with a first upper insertion slot 211, and the upper part of the first end of the partition plate 5 is inserted into the first upper insertion slot 211 and connected with the rear side wall 11 in a plug-in manner; the first flow guide plate 21 is provided with a first lower insertion slot 212, and the lower part of the first end of the partition plate 5 is inserted into the first lower insertion slot 212. In this way, the plug-in connection between the partition plate 5 and the first flow guide plate 21 can be achieved without using bolts or welding.

[0091] When the first flow guide plate 21 is provided with the first upper insertion slot 211, the partition plate 5 is provided with a first limiting assembly 51, the first limiting assembly 51 comprises a first upper limiting protrusion 511 and a first lower limiting protrusion 512 arranged at intervals with the first upper limiting protrusion 511; in the state that the partition plate 5 is inserted into the first upper insertion slot 211, the first flow guide plate 21 is located between the first upper limiting protrusion 511 and the first lower limiting protrusion 512. The first limiting assembly 51 can limit the first flow guide plate 21 upward and downward, and ensure the installation stability of the first flow guide plate 21.

[0092] In some embodiments, the first upper limiting protrusion 511 and the first lower limiting protrusion 512 are arranged on both sides of the partition plate 5, which can make the first flow guide plates 21 on both sides of the partition plate 5 be limited and supported by the first limiting assembly 51, make the first flow guide plates 21 bear forces uniformly, and improve the installation stability of the first flow guide plates 21.

[0093] Further, the second guide plate 22 is provided with a second insertion slot 221, and the second end of the partition plate 5 is inserted into the second insertion slot 221. In this way, the partition plate 5 and the second guide plate 22 can be connected by insertion without using bolts or welding.

[0094] When the second guide plate 22 is provided with the second insertion slot 221, the partition plate 5 is provided with a second limiting assembly 52, which includes a second upper limiting protrusion 521 and a second lower limiting protrusion 522 arranged at intervals from the second upper limiting protrusion 521; and in the state that the partition plate 5 is inserted into the second insertion slot 221, the second guide plate 22 is located between the second upper limiting protrusion 521 and the second lower limiting protrusion 522.

[0095] In some embodiments, the second upper limiting protrusion 521 and the second lower limiting protrusion 522 are arranged on both sides of the partition plate 5, so that the second guide plate 22 on both sides of the partition plate 5 is limited and supported by the second limiting assembly 52, the second guide plate 22 is uniformly stressed, and the installation stability of the second guide plate 22 is improved.

[0096] In addition, the outer contour and installation size of the combustor 202 provided by the present application are basically consistent with those of the combustor in the conventional technology, and the combustor has good part universality and whole machine compatibility.

[0097] Obviously, the above embodiments of the present application are only examples for clear illustration of the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made in the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A burner, characterized in that, include: Burner housing (1); A guide plate (2) is fixed inside the burner housing (1) and forms a premixed flow channel (10) inside the burner housing (1). The burner (4) is fixed to the top of the burner housing (1) and located above the premixed flow channel (10). The burner (4) includes a burner body (41) and a plurality of first flame outlet structures (42) spaced apart from the burner body (41). The flame outlet body (41) is provided with a protrusion (421), and the protrusion (421) is provided with a first flame outlet hole (422) that connects to the premixed flow channel (10). The diameter of the first flame outlet hole (422) is smaller than the quenching diameter of the gas. The protrusion (421) and the first flame outlet hole (422) form the first flame outlet structure (42).

2. The burner according to claim 1, characterized in that, The fire bar (4) further includes a second fire outlet structure (43), and the second fire outlet structure (43) is provided between two adjacent first fire outlet structures (42). The fire bar body (41) is provided with a second fire outlet hole (431), and the fire bar body (41) is provided with a blocking member (432) that blocks the second fire outlet hole (431) at intervals. The distance between the blocking member (432) and the fire bar body (41) is less than the distance between the protrusion (421) and the fire bar body (41). The blocking member (432) and the second fire outlet hole (431) form the second fire outlet structure (43).

3. The burner according to claim 2, characterized in that, Multiple first flame-out structures (42) arranged at intervals along a first direction form a group of first flame-out structures, and multiple groups of first flame-out structures are arranged at intervals along a second direction; multiple second flame-out structures (43) are arranged at intervals along a first direction between two adjacent groups of first flame-out structures, and the area of ​​the second flame-out hole (431) of the second flame-out structure (43) located in the middle position of the first direction is greater than the area of ​​the second flame-out hole (431) of the second flame-out structures (43) at other positions.

4. The burner according to claim 2, characterized in that, The diameter of the first flame outlet (422) gradually decreases from the direction where the flame bar body (41) is located to the direction away from the flame bar body (41); And / or, the second flame outlet (431) is a rectangular hole, and the length direction of the second flame outlet (431) extends along the first direction.

5. The burner according to claim 4, characterized in that, The protrusion (421) is frustum-shaped, and the diameter of the protrusion (421) gradually decreases from the direction of the fire plate body (41) to the direction away from the fire plate body (41).

6. The burner according to any one of claims 2-5, characterized in that, The burner also includes a flow equalization plate (3), and the top of the burner housing (1) is provided with a flange. The flow equalization plate (3) and the fire row (4) are both fixed to the flange, and the flow equalization plate (3) is located below the fire row (4). The flow equalization plate (3) is provided with a number of spaced flow equalization holes (31).

7. The burner according to claim 6, characterized in that, The burner body (41) includes an opening (411) and a fixing part (412) surrounding the opening (411). The opening (411) protrudes away from the flow equalization plate (3) relative to the fixing part (412). The opening (411) is used to set the first flame outlet structure (42) and the second flame outlet structure (43). The fixing part (412) is used to fix and connect to the burner housing (1).

8. The burner according to claim 7, characterized in that, The distance between the opening (411) and the flow equalization plate (3) increases first and then decreases along the first direction.

9. A burner device, characterized in that, The device includes a housing (201) and a burner as described in any one of claims 1-8, wherein the burner is fixed inside the housing (201) and the internal space of the housing (201) is divided into an upper cavity and a lower cavity arranged vertically, wherein the upper cavity forms a combustion chamber (2012) and the lower cavity forms an air buffer chamber (2011).

10. A gas-fired water heater, characterized in that, The device includes a blower (400), a gas proportional valve (500), and a burner assembly as claimed in claim 9, wherein the blower (400) is used to supply air to the burner assembly, and the gas proportional valve (500) is configured to be connected to a gas pipeline and used to supply gas to the burner assembly.

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