Fire grate assembly and gas water heater

Abstract

The present invention discloses a fire grate assembly and a gas water heater, aiming to solve the problem of serious heat loss caused by excessive secondary air supply of the fire grate, comprising a fire grate and a bottom plate; the fire grate comprises a first side plate and a second side plate in a relative position relationship, and a top plate connected to the top of the first side plate and the second side plate; a gas outlet hole is opened on the top plate, and a groove is opened on the outer wall of the first side plate and / or the second side plate, the groove forms an air flow channel, and the opening position of the air flow channel at the top of the first side plate and / or the second side plate corresponds to the opening position of the gas outlet hole on the top plate; the fire grate is installed on the bottom plate, a ridge is formed on the bottom plate, and an air outlet hole is opened on the ridge, and the air outlet hole faces the air flow channel, so that the air discharged through the air outlet hole can flow to the air flow channel, and flow along the air flow channel to the gas outlet hole, and then efficiently mix with the gas discharged through the gas outlet hole.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas devices and relates to a fire grate burner, in particular to a fire grate assembly used in the fire grate burner and a gas water heater designed based on the fire grate assembly. Background Art

[0002] Gas water heaters, also known as gas water heaters, use gas as fuel and transfer heat to cold water flowing through a heat exchanger through combustion heating to achieve the purpose of preparing hot water. Current gas water heaters generally include a shell, an exhaust device, a burner, a heat exchanger, a gas control device, a water control device, a water-gas linkage device, and an electronic control system. Among them, the burner provides a combustion chamber for the mixed combustion of gas and air, and a fire grate is provided in the combustion chamber. The fire grate has the function of conveying gas. The gas conveyed by the fire grate needs to be mixed with a sufficient amount of air before it can be fully burned in the combustion chamber.

[0003] At present, the combustion air of gas water heaters mainly comes from two parts: one part is the primary air when the gas enters the grate, due to the turbulent diffusion of the gas airflow, the surrounding air is driven into the grate along with the gas. The amount of primary air brought into the grate by the gas is limited and cannot meet the requirements of full combustion of the gas; the other part is the secondary air that uses the active air supply method to blow the outside atmosphere into the combustion chamber by the fan. In the combustion chamber, the gas is fully mixed with the primary air and the secondary air, and the mixed gas is ignited at the fire hole to achieve complete combustion.

[0004] For existing gas water heaters, the supply of secondary air is often much larger than the amount of air required for complete combustion of gas. A large amount of secondary air will take away a large amount of heat after entering the combustion chamber, thereby reducing the heat exchange efficiency of the gas water heater.

[0005] In view of this, how to reduce heat loss and improve the heat exchange effect of the gas water heater is a major technical problem to be solved by the present invention. Summary of the invention

[0006] In order to solve the problem in the prior art of serious heat loss caused by excessive amount of secondary air provided to the fire grate, the present invention proposes a new structural design of the fire grate assembly, which can reduce the supply of secondary air while meeting the requirement of full combustion of gas, thereby reducing the heat carried away by the secondary air and improving the heat exchange efficiency.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] In one aspect, the present invention proposes a fire grate assembly, comprising a fire grate and a bottom plate; wherein the fire grate comprises a first side plate and a second side plate in a relative positional relationship, and a top plate connected between the first side plate and the second side plate and located on the top of the first side plate and the second side plate; a gas outlet hole is opened on the top plate, and a groove is opened on the outer wall of the first side plate and / or the second side plate, and the groove forms an air flow channel, and the opening position of the air flow channel at the top of the first side plate and / or the second side plate corresponds to the opening position of the gas outlet hole on the top plate; the fire grate is installed on the bottom plate, and a ridge is formed on the bottom plate, and an air outlet hole is opened on the ridge, and the air outlet hole faces the air flow channel, so that the air discharged through the air outlet hole can flow to the air flow channel, and flow along the air flow channel to the gas outlet hole, and then mix with the gas discharged through the gas outlet hole.

[0009] In order to improve the mixing efficiency of gas and secondary air, it is preferred that the number of air flow channels opened on the first side plate or the second side plate is the same as the number of gas outlet holes opened on the top plate, and one air flow channel corresponds to one gas outlet hole.

[0010] In order to effectively control the supply amount of secondary air, it is preferred that the number of air outlet holes opened on the raised portion is equal to the number of air flow channels opened on the first side plate or the second side plate, and one air outlet hole corresponds to one air flow channel.

[0011] In order to allow the secondary air guided through the air flow channel to mix with the gas discharged through the gas outlet, the two air flows can be mixed at a certain angle, thereby accelerating the mixing speed of the secondary air and the gas, so as to further reduce the demand for secondary air for complete combustion of the gas, the present invention is designed that the first side plate and the second side plate include a vertical surface extending upward from the bottom and an inclined surface extending upwardly and retracted from the top of the vertical surface toward the top plate, the top of the inclined surface is butt-jointed with the top plate, and the angle formed by the inclined surface and the top plate is an obtuse angle; the air flow channel extends from the bottom end of the vertical surface to the top end of the vertical surface in a vertical direction, and further extends to the inclined surface, and extends to the top end of the inclined surface along the same inclination angle as the inclined surface, so that when the secondary air guided through the air flow channel is mixed with the gas, the flow directions of the two air flows can form an acute angle, and mixing at an acute angle can improve the mixing efficiency of the secondary air and the gas.

[0012] Preferably, the raised portion extends in a straight line along the length direction of the fire grate, and the raised portion includes a top surface and an inclined side surface. The air outlet holes are opened on the inclined side surfaces, so that the air discharged through the air outlet holes can flow into the air flow channel in an inclined upward direction, so as to ensure that more secondary air can flow under the guiding effect of the air flow channel.

[0013] Preferably, the top plate is preferably arranged horizontally, and the gas outlet holes are preferably provided in a plurality and arranged in a line along the length direction of the top plate, so that the gas can be discharged from the gas outlet holes in a vertically upward direction; the top surface of the raised portion is preferably designed as a horizontal top surface, and air outlet holes are also provided thereon, so that the air discharged through the air outlet holes provided on the horizontal top surface can flow vertically upward. The secondary air flowing vertically upward can be used to further mix with the gas discharged through the gas outlet to ensure sufficient mixing of the gas and the air, and can also blow away the smoke generated by the mixed gas of the gas and the air after combustion.

[0014] Preferably, the length of the raised portion is designed to be equal to the length of the fire grate; the air outlet holes opened on the horizontal top surface of the raised portion preferably include a plurality of holes, and are arranged in a line along the length direction of the raised portion to improve the mixing effect of the gas and air and the exhaust effect of the smoke.

[0015] In order to generate a large amount of heat in a short time, the present invention preferably forms a plurality of raised portions on the bottom plate, the raised portions are arranged in parallel and spaced apart, and a flat plate portion is formed between two adjacent raised portions, and a fire bar is installed on each flat plate portion.

[0016] Furthermore, the air flow channel is provided on the outer walls of the first side plate and the second side plate of the fire bar; among the multiple raised parts, except for the two raised parts located on the outside, the other raised parts include two inclined side surfaces, each of which is provided with an air outlet hole for conveying air to the air flow channel, and each fire bar is located between one of the inclined side surfaces of two adjacent raised parts; the two raised parts located on the outside have the inclined side surfaces facing the fire bar as the inclined side surfaces with the air outlet holes, and the side surfaces away from the fire bar form an air blocking surface to prevent excessive secondary air and increase heat loss.

[0017] In order to facilitate installation, the present invention further provides a first bracket and a second bracket in the fire grate assembly, and the first bracket and the second bracket are two L-shaped brackets arranged opposite to each other, and are respectively placed at the opposite ends of the bottom plate in the length direction of its raised portion; wherein, the bottom surface of the bottom plate is installed on the horizontal planes of the two L-shaped brackets, and the opposite ends of the bottom plate are respectively connected to the vertical surfaces of the two L-shaped brackets to block the openings formed at the two ends of the raised portion, so that the secondary air can only be discharged through the air outlet holes opened on the raised portion, so as to achieve effective control of the secondary air supply; openings equal to the number of the fire grate are formed on the vertical surface of the second bracket, and the gas inlet holes on the fire grate are connected to the gas through the openings.

[0018] In another aspect, the present invention further proposes a gas water heater, comprising a burner, an air supply device and a fan, wherein the burner forms a combustion chamber for mixed combustion of gas and air, wherein a fire grate assembly is arranged in the combustion chamber, and the fire grate assembly comprises a fire grate and a bottom plate; wherein the fire grate comprises a first side plate and a second side plate in a relative positional relationship, and a top plate connected between the first side plate and the second side plate and located on the top of the first side plate and the second side plate; a gas outlet hole is provided on the top plate, and a groove is provided on the outer wall of the first side plate and / or the second side plate, wherein the groove forms an air flow channel, and the air The opening position of the air flow channel at the top of the first side panel and / or the second side panel corresponds to the opening position of the gas outlet hole on the top panel; the fire grate is installed on the bottom plate, a ridge is formed on the bottom plate, an air outlet hole is opened on the ridge, and the air outlet hole faces the air flow channel, so that the air discharged through the air outlet hole can flow to the air flow channel and flow along the air flow channel to the gas outlet hole, and then mix with the gas discharged through the gas outlet hole; the fan blows air to the bottom plate, and the air is discharged through the air outlet hole opened on the ridge.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are as follows: the present invention arranges an air flow channel on the fire grate, forms a bulge on the bottom plate, and opens air outlet holes on the bulge, so that the secondary air can accurately flow to the air flow channel on the fire grate after passing through the bottom plate, and is efficiently mixed with the gas output by the fire grate under the drainage effect of the air flow channel. Therefore, under the premise of ensuring complete combustion of the gas, the supply of secondary air can be significantly reduced, thereby solving the problem that a large amount of heat generated by combustion due to excessive supply of secondary air is carried away by excess secondary air, reducing heat loss, and applying it to gas water heaters can significantly improve the heat exchange efficiency of the gas water heater and save gas resources.

[0020] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a fire grate in the prior art;

[0023] Figure 2 It is a structural schematic diagram of an embodiment of a bottom plate in the prior art;

[0024] Figure 3 It is a structural schematic diagram of an embodiment of the fire grate assembly proposed by the present invention;

[0025] Figure 4 yes Figure 3 The structural schematic diagram of the fire grate assembly shown is after being rotated to a certain angle;

[0026] Figure 5 yes Figure 3 A structural schematic diagram of an embodiment of the fire grate in FIG.

[0027] Figure 6 yes Figure 5 Bottom view of

[0028] Figure 7 yes Figure 3 A schematic structural diagram of an embodiment of a base plate in FIG. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0030] It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom" 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 limiting 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.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Figure 1 , Figure 2 The structural design of a fire grate 1 and a bottom plate 2 used in an existing gas water heater is shown. The fire grate 1 is mainly connected by a first side plate 11, a second side plate 12, a first end plate 13, a second end plate 14, a bottom plate 15 and a top plate 16 to form a gas chamber for receiving gas. A gas outlet hole 17 is provided on the top plate 16, and a gas inlet hole 18 is provided on the second end plate 14. In the gas water heater, the gas supply device provides gas, which enters the gas chamber through the gas inlet hole 18 of the fire grate, and then is discharged through the gas outlet hole 17 to mix with the air in the burner. The mixed gas is ignited at the fire hole to achieve complete combustion of the gas in the burner. In order to enable the gas to be fully mixed with the air to meet the requirement of complete combustion of the gas, a fan needs to be provided to provide sufficient secondary air to the burner, and the secondary air is sent into the burner through the air outlet hole 21 provided on the bottom plate 2.

[0033] In the prior art, the base plate 2 is usually designed as follows Figure 2 The flat plate structure shown has multiple rows of air outlet holes 21 arranged in parallel on the bottom plate 2, and a fire grate 1 is installed between two adjacent rows of air outlet holes 21. With this structural design, the fire grate 1 discharges the gas in a vertically upward direction, and the air outlet holes 21 on the bottom plate 2 also discharge the secondary air in a vertically upward direction. The gas and the secondary air are diffused in the combustion chamber formed by the burner and then mixed, and the mixing efficiency is low. If the requirement of sufficient mixing of gas and air is to be met, the combustion chamber must be supplied with a much larger amount of secondary air than that required for mixing, which will cause the heat generated by the combustion to be carried away by the excess secondary air, thereby causing serious heat loss and reducing the heat exchange efficiency of the gas water heater.

[0034] In order to solve the above problems existing in the prior art, the present embodiment improves the structure of the fire grate and the bottom plate to form a fire grate assembly with a completely new structure, such as Figure 3 , Figure 4 As shown, under the premise of meeting the requirement of sufficient mixing of gas and air, the supply of secondary air can be greatly reduced, thereby achieving the design goal of reducing heat loss and improving the heat exchange efficiency of the gas water heater.

[0035] like Figure 5 , Figure 6As shown, the fire bar 5 of this embodiment mainly includes components such as a first side plate 51, a second side plate 52, a first end plate 53, a second end plate 54, a bottom plate 55 and a top plate 56. Among them, the first side plate 51 and the second side plate 52 are in a relative position relationship, the top is connected to the top plate 56, the bottom is connected to the bottom plate 55, and the remaining two ends are respectively connected to the first end plate 53 and the second end plate 54, thereby surrounding and forming a gas cavity. The gas inlet hole 58 is preferably opened on the second end plate 54 and is located at the lower part of the second end plate 54. The gas outlet hole 57 is opened on the top plate 56, preferably multiple holes are opened, and they are arranged in a line along the length direction of the top plate 56. The length direction of the top plate 56 is defined as the length direction of the fire bar 5, then the first side plate 51 and the second side plate 52 extend along the length direction of the fire bar 5, and the first end plate 53 and the second end plate 54 extend along the width direction of the fire bar 5.

[0036] A groove is provided on the outer wall of one or both of the first side plate 51 and the second side plate 52 to form an air flow channel 59 for guiding the secondary air to the gas outlet hole 57, thereby improving the mixing efficiency of the gas and the secondary air. Specifically, the same number of air flow channels 59 as the gas outlet holes 57 can be provided on the first side plate 51 and / or the second side plate 52, and one air flow channel 59 corresponds to one gas outlet hole 57, and the opening position of the air flow channel 59 on the top of the first side plate 51 and the second side plate 52 should correspond to the opening position of the gas outlet hole 57 on the top plate 56, so that the gas discharged through each gas outlet hole 57 can be quickly and fully mixed with the secondary air discharged from the corresponding air flow channel at the moment of discharge, thereby improving the mixing efficiency of the gas and the secondary air, and the requirement of fully mixing the gas and the air can be met without supplying a large amount of secondary air. As the secondary air supply is reduced, the heat carried away by the secondary air will be reduced accordingly, the heat loss is reduced, and the heat exchange efficiency is improved.

[0037] As a preferred embodiment, the secondary air discharged to the gas outlet 57 through the air flow channel 59 can be designed to merge with the gas at a certain acute angle, thereby further increasing the mixing efficiency of the gas and the secondary air. In order to achieve this design purpose, the present embodiment forms a vertical surface and an inclined surface on the first side plate 51 and the second side plate 52. Taking the first side plate 51 as an example, the vertical surface 511 can extend vertically upward from the bottom of the first side plate 51, and the inclined surface 512 extends upward from the top of the vertical surface 511 to the top plate 56, and the top of the inclined surface 512 is connected to the top plate 56, and the angle α formed by the inclined surface 512 and the top plate 56 is an obtuse angle. When the air flow channel 59 is opened on the first side panel 51, the air flow channel 59 is designed to extend straightly in the vertical direction from the bottom end of the vertical surface 511 to the top of the vertical surface 511, and then further extend to the inclined surface 512, and then extend to the top of the inclined surface 512 along the same inclination angle as the inclined surface 512, and dock with the position where the gas outlet hole 57 is opened on the top plate 56.

[0038] In some embodiments, the angle α formed by the inclined surface 512 and the top plate 56 is preferably between 120° and 150°, so that the secondary air discharged through the air flow channel 59 can merge with the gas discharged through the gas outlet hole 57 at an acute angle of 30° to 60° to obtain the best mixing efficiency. In this embodiment, the top plate 56 is preferably arranged horizontally so that the gas ejected through the gas outlet hole 57 flows vertically upward. The secondary air discharged through the air flow channel 59 is designed to merge with the gas discharged through the gas outlet hole 57 at an acute angle of 30° to 60°, which can improve the mixing efficiency while reducing the influence of the secondary air on the gas flow direction, ensuring that the mixed gas can be accurately ignited at the fire hole.

[0039] In this embodiment, the air flow channel 59 is designed on the fire grate 5, which can not only regulate the flow trajectory of the secondary air and improve the mixing efficiency of the gas and the secondary air, but also reduce the noise generated when the secondary air flows, which helps to improve the user experience of the gas water heater.

[0040] In order to guide as much secondary air as possible to the air flow channel 59 to improve the utilization rate of the secondary air and further limit the supply of secondary air, the present embodiment improves the structural design of the bottom plate, such as Figure 7As shown, the conventional structure of designing the bottom plate as a flat plate is abandoned, and a raised portion 61 is formed on the bottom plate 6. The raised portions 61 are preferably provided in plurality, parallel to each other and preferably arranged at equal intervals, and a flat plate portion 62 is formed between two adjacent raised portions 61 for mounting the fire bar 5. Specifically, the bottom plate 55 of the fire bar 5 can be mounted on the flat plate portion 62 of the bottom plate 6, and the first side plate 51 and the second side plate 52 of the fire bar 5 are respectively in a one-to-one adjacent position relationship with two adjacent raised portions 61, as shown in FIG. Figure 3 An air outlet hole 63 is provided on the raised portion 61, and the air outlet hole 63 faces the air flow channel 59 on the fire grate 5, so that the secondary air discharged through the air outlet hole 63 can flow more toward the air flow channel 59, and flow along the air flow channel 59 to the gas outlet hole 57 on the fire grate 5, so as to achieve high-efficiency mixing with the gas.

[0041] In order to allow the secondary air discharged into the air channel 59 through the air outlet holes 63 to flow upward along the air channel 59 as much as possible, the present embodiment preferably designs the raised portion 61 to include a top surface 613 and an inclined side surface 611 or 612, and the inclined side surfaces 611, 612 are connected to the flat portion 62, and the angle β formed with the flat portion 62 is an obtuse angle, and the air outlet holes 63 are opened on the inclined side surfaces 611, 612, so that the secondary air discharged through the air outlet holes 63 can flow into the air channel 59 in an inclined upward direction.

[0042] As a preferred embodiment, the angle β formed by the inclined side surfaces 611, 612 and the flat plate portion 62 can be designed to be between 130° and 150°. If β is too small, more secondary air will be rebounded by the air flow channel 59 after the secondary air discharged to the air flow channel 59 contacts the air flow channel 59; if β is too large, the secondary air that can reach the air flow channel 59 will become smaller, which is not conducive to the effective delivery of the secondary air to the air flow channel 59. Therefore, in some embodiments, the angle β can be designed to be 135°, so that the secondary air discharged through the air outlet 63 can basically all flow to the air flow channel 59.

[0043] In this embodiment, each raised portion 61 is designed to extend in a straight line along the length direction of the fire bar 5, and a plurality of air outlet holes 63 are opened on the inclined side surface 611 or 612 of the raised portion 61. The plurality of air outlet holes 63 are arranged in a line along the length direction of the raised portion 61 (the same as the length direction of the fire bar 5) on the inclined side surface 611 or 612, and the number of the plurality of air outlet holes 63 is the same as the number of the air flow channels 59 opened on the first side plate 51 or the second side plate 52 of the fire bar 5, and one air outlet hole 63 corresponds to one air flow channel 59.

[0044] In order to generate a large amount of heat in a short time, the present embodiment preferably arranges a plurality of fire bars 5 on the bottom plate 6. For the plurality of fire bars 5, the present embodiment forms a plurality of ridges 61 on the bottom plate 6, and a fire bar 5 is installed between each two adjacent ridges 61. Among the plurality of ridges 61, except for the two ridges located at the outermost sides, the remaining ridges include two inclined side surfaces 611 and 612, and an air outlet hole 63 is provided on each inclined side surface 611 and 612. Each fire bar 5 is formed with an air flow channel 59 on the outer wall of its first side plate 51 and the second side plate 52 to accelerate the mixing speed of the gas and the secondary air. As for the two ridges located at the outermost sides, the side facing the fire bar 5 is designed to be an inclined side surface 611 or 612, and the air outlet hole 63 is provided on the inclined side surface 611 or 612 to discharge the secondary air to the fire bar 5 adjacent thereto. The side 614 of the two outermost raised portions facing away from the fire bar 5 is designed to be a plane without air outlet holes, such as Figure 7 As shown, an air blocking surface is formed to prevent secondary air from leaking from the side surface 614. In order to facilitate the installation and fixation of the bottom 6 on other components, the side surface 614 is preferably designed as a vertical plane in this embodiment.

[0045] In addition, in this embodiment, the length of the raised portion 61 is preferably designed to be equal to the length of the fire grate 5, and the top surface 613 of the raised portion 61 is designed to be a horizontal top surface. An air outlet hole 64 is provided on the horizontal top surface 613 of the raised portion 61, so that the secondary air discharged through the air outlet hole 64 flows vertically upward, that is, the flow direction is the same as that of the gas discharged from the gas outlet hole 57 on the fire grate 5. The air outlet hole 64 is provided on the horizontal top surface 613 of the raised portion 61. On the one hand, the secondary air discharged through the air outlet hole 64 can be further mixed with the mixed gas to ensure sufficient mixing of the gas and the secondary air; on the other hand, the smoke generated by the mixed gas of the gas and air after combustion can be blown away.

[0046] As a preferred embodiment, a plurality of air outlet holes 64 may be provided on the horizontal top surface 613 of the raised portion 61. For example, the number of air outlet holes 64 may be the same as the number of gas outlet holes 57 provided on the fire grate 5, and the air outlet holes 64 may be arranged in a line along the length direction of the raised portion 61 to improve mixing and smoke exhaust effects.

[0047] In order to facilitate the assembly of the bottom plate 6 and the fire grate 5 into the burner of the gas water heater, two brackets are further provided in the fire grate assembly in this embodiment, such as Figure 3 , Figure 4As shown, they are the first bracket 3 and the second bracket 4. As a preferred embodiment, the first bracket 3 and the second bracket 4 are preferably designed to be L-shaped and arranged opposite to each other, and are respectively placed at the opposite ends of the bottom plate 6 in the length direction of its raised portion 61. The bottom surface of the bottom plate 6 is mounted on the horizontal planes of the two L-shaped brackets 3 and 4, and the vertical surfaces of the two L-shaped brackets 3 and 4 are respectively connected to the opposite ends of the bottom plate 6 in the length direction of its raised portion 61, so as to block the openings 65 formed by the raised portion 61 at the two ends, and the ... and the bottom surface of the bottom plate 6 is mounted on the horizontal planes of the two L-shaped brackets 3 and 4, and the vertical surfaces of the two L-shaped brackets 3 and 4 are respectively connected to the opposite ends of the bottom plate 6 in the length direction of its raised portion 61, and the bottom surface of the bottom plate 6 is mounted on the horizontal planes of the two L-shaped brackets 3 and 4, and the bottom surface of the bottom plate 6 is respectively connected to the opposite ends of the raised portion 61, and the bottom surface of the bottom plate 6 is respectively connected to the opposite ends of the raised portion 61, and the bottom surface of the bottom plate 6 is respectively connected to the opposite ends of the Figure 7 As shown, the secondary air flowing under the bottom plate 6 can be discharged only through the air outlet holes 63 and 64 provided on the raised portion 61 and provided to the fuel gas for mixing, thereby facilitating effective control of the secondary air supply.

[0048] In addition, in this embodiment, a plurality of openings 41 are formed on the vertical surface of the second bracket 4. Figure 3 As shown, the number of the openings 41 can be specifically determined according to the number of fire grates 5 installed on the base plate 6, and the position of each opening 41 corresponds to the position of the gas inlet hole 58 on the fire grate 5, so that the gas inlet hole 58 on the fire grate 5 can be connected to the gas supply device in the gas water heater through the opening 41 to connect to the gas provided by the gas supply device.

[0049] In the gas water heater of this embodiment, a fan may be provided to generate airflow, which is blown to the bottom of the bottom plate 6 and then discharged through the air outlet holes 63 and 64 provided on the raised portion 61 to form secondary air for mixing with the gas.

[0050] Of course, the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced 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 of the embodiments of the present invention.

Claims

1. A fire bar assembly, comprising: A fire grate, comprising a first side plate and a second side plate in a relative position relationship, and a top plate connected between the first side plate and the second side plate and located on the top of the first side plate and the second side plate; a gas outlet hole is opened on the top plate, and a groove is opened on the outer wall of the first side plate and / or the second side plate, and the groove forms an air flow channel, and the opening position of the air flow channel on the top of the first side plate and / or the second side plate corresponds to the opening position of the gas outlet hole on the top plate; A bottom plate is provided on which the fire grate is installed, a raised portion is formed on the bottom plate, an air outlet hole is provided on the raised portion, and the air outlet hole faces the air flow channel, so that the air discharged through the air outlet hole can flow to the air flow channel and flow along the air flow channel to the gas outlet hole, and then mix with the gas discharged through the gas outlet hole.

2. The fire bar assembly according to claim 1, characterized in that: The number of the air flow channels opened on the first side plate or the second side plate is the same as the number of the gas outlet holes opened on the top plate, and one air flow channel corresponds to one gas outlet hole.

3. The fire grate assembly according to claim 1, characterized in that: The number of air outlet holes opened on the raised portion is the same as the number of air flow channels opened on the first side plate or the second side plate, and one air outlet hole corresponds to one air flow channel.

4. The fire bar assembly according to any one of claims 1 to 3, characterized in that: The first side plate and the second side plate include a vertical surface extending upward from the bottom and an inclined surface extending upwardly and retracting from the top of the vertical surface toward the top plate, the top of the inclined surface butts against the top plate, and the angle formed by the inclined surface and the top plate is an obtuse angle; The air flow channel extends from the bottom end of the vertical surface to the top end of the vertical surface in a vertical direction, extends to the inclined surface, and extends to the top end of the inclined surface along the same inclination angle as the inclined surface.

5. The fire bar assembly according to any one of claims 1 to 3, characterized in that: The raised portion extends linearly along the length direction of the fire bar, and the raised portion includes a top surface and an inclined side surface. The air outlet holes are opened on the inclined side surfaces, so that the air discharged through the air outlet holes flows into the air flow channel in an inclined upward direction.

6. The fire bar assembly according to claim 5, characterized in that: The top plate is arranged horizontally, and the gas outlet holes include a plurality of holes arranged in a line along the length direction of the top plate, and the gas is discharged from the gas outlet holes in a vertical upward direction; The top surface of the raised portion is a horizontal top surface, and air outlet holes are also provided on the top surface. The air discharged through the air outlet holes provided on the horizontal top surface flows vertically upward.

7. The fire bar assembly according to claim 6, characterized in that: The length of the raised portion is equal to the length of the fire bar, and a plurality of air outlet holes are provided on the horizontal top surface of the raised portion and are arranged in a line along the length direction of the raised portion.

8. The fire bar assembly according to claim 5, characterized in that: A plurality of raised portions are formed on the bottom plate, each of which is arranged in parallel and spaced apart, and a flat plate portion is formed between two adjacent raised portions, and a fire bar is installed on each flat plate portion.

9. The fire bar assembly according to claim 8, characterized in that: The air flow channel is provided on the outer walls of the first side plate and the second side plate of the fire bar; among the plurality of raised parts, except for the two raised parts located on the outer sides, the remaining raised parts include two inclined side surfaces, each of which is provided with an air outlet hole for conveying air to the air flow channel, and each fire bar is located between one of the inclined side surfaces of two adjacent raised parts; The two raised portions located on the outside have inclined sides facing the fire bar with air outlet holes, and the sides facing away from the fire bar form air blocking surfaces.

10. A gas water heater, comprising a burner, an air supply device and a fan, wherein the burner forms a combustion chamber for mixing gas and air for combustion, characterized in that: A fire grate assembly as claimed in any one of claims 1 to 9 is arranged in the combustion chamber, the air supply device transports fuel gas to the fire grate, the fan blows air to the bottom plate, and the air is discharged through the air outlet holes opened on the raised part.

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