Fire grills, burners and gas water heaters

Abstract

The present application belongs to the technical field of water heaters, and specifically relates to a fire grate, a burner and a gas water heater. The present application aims to solve the problem that the arc-shaped flame holes of the existing fire grate lead to poor flame gathering effect. The fire grate of the present application includes an inner shell and an outer shell, and a connected introduction channel and a main air flow channel are formed in the inner shell. The outer shell includes a top plate and two second side plates, and the ends of the second side plates are connected to the inner shell. An auxiliary air flow channel is formed between the second side plate and a part of the inner shell located on the inner side of the second side plate, and a through hole is provided on the inner shell forming the auxiliary air flow channel to connect the auxiliary air flow channel and the main air flow channel. A plurality of combustion holes are provided on the top plate, and some of the combustion holes corresponding to the main air flow channel form main flame holes, and some of the combustion holes corresponding to the auxiliary air flow channel form auxiliary flame holes. The cross-sectional area of ​​the auxiliary flame hole is smaller than the cross-sectional area of ​​the main flame hole. The auxiliary flame formed by the auxiliary flame hole can limit the main flame, thereby improving the gathering effect of the flame.

Description

Technical Field

[0001] The present application belongs to the technical field of water heaters, and specifically relates to a fire grate, a burner and a gas water heater. Background Art

[0002] A gas water heater is a gas appliance that uses gas as fuel and burns a mixture of air and gas in a combustion chamber through a burner to produce high-temperature flue gas. The high-temperature flue gas flows through a heat exchanger and exchanges heat with cold water in the heat exchanger to prepare hot water. It is widely used because of its convenience in use and fast hot water production.

[0003] The top surface of the existing burner is an arc-shaped surface, and an arc-shaped flame hole is provided on the arc-shaped top surface, and side plates are respectively arranged at both ends of the flame hole to achieve the purpose of controlling the flame shape.

[0004] However, the arc-shaped flame hole easily causes the flame to diverge outward, and the side panels have a poor effect in limiting the flame shape, resulting in a poor flame gathering effect, which affects the heating efficiency of the gas water heater. Summary of the invention

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that the arc-shaped flame holes of the existing fire grate lead to poor flame gathering effect, the present application provides a fire grate, a burner and a gas water heater.

[0006] The fire grate comprises: an inner shell and an outer shell covering part of the outer side of the inner shell; a connected induced draft channel and a main airflow channel are formed in the inner shell; the outer shell comprises a top plate and two first side plates arranged at intervals on the bottom surface of the top plate, the top plate abuts against the top end of the inner shell, the end of the first side plate is connected to the inner shell, and there is a gap between the first side plate and the part of the inner shell located on the inner side of the first side plate to form an auxiliary airflow channel; the part of the inner shell forming the auxiliary airflow channel is provided with a through hole connecting the auxiliary airflow channel and the main airflow channel; a plurality of combustion holes arranged at intervals along a first direction are provided on the top plate; the part of the combustion holes corresponding to the main airflow channel forms a main flame hole, and the part of the combustion holes corresponding to the auxiliary airflow channel forms an auxiliary flame hole, the auxiliary flame holes are located on both sides of the main flame hole, and the cross-sectional area of ​​the auxiliary flame hole is smaller than the cross-sectional area of ​​the main flame hole.

[0007] In the optional technical solution of the above-mentioned fire grate, the combustion hole is a long strip hole extending along the second direction, and the second direction is perpendicular to the first direction; the ratio of the length of the auxiliary flame hole along the second direction to the length of the combustion hole along the second direction is 20% to 35%.

[0008] In the optional technical solution of the above-mentioned fire bar, the first side plate includes a connecting plate portion, an auxiliary plate portion and a transition plate portion connecting the connecting plate portion and the auxiliary plate portion, and there is a gap between the auxiliary plate portion and the inner shell to form the auxiliary air flow channel, the top end of the auxiliary plate portion is connected to the top flat plate, and the two side edges and the bottom end of the auxiliary plate portion are respectively connected to the connecting plate portion through the transition plate portion; the connecting plate portion is welded to the inner shell.

[0009] In the optional technical solution of the above-mentioned fire grate, the auxiliary plate portion is provided with a plurality of convex bumps protruding toward the inner shell, and the convex bumps are in contact with the inner shell, and the plurality of convex bumps are arranged at intervals along the first direction; the auxiliary plate portion is also provided with reinforcing ribs protruding toward the inner shell, and there is a gap between the reinforcing ribs and the inner shell.

[0010] In the optional technical solution of the above-mentioned fire bar, the inner shell includes two layers of second side plates, partial areas of the two layers of second side plates are contact welded, and partial areas of the two layers of second side plates have gaps to form the ejection channel and the main airflow channel; the main airflow channel includes a first section channel, a second section channel and a third section channel that are connected in sequence; one end of the first section channel is connected to the ejection channel, and the cross-sectional area of ​​the first section channel is smaller than the cross-sectional area of ​​the ejection channel; the outer side surface of the part of the second side plate that forms the second section channel is connected to the first side plate, and the distance between the two layers of the second side plates that form the second section channel is greater than the distance between the two layers of the second side plates that form the first section channel; the part of the second side plate that forms the third section channel is spaced from the first side plate to form the auxiliary airflow channel; the part of the two layers of the second side plates that form the third section channel are respectively provided with the through holes; the distance between the two layers of the second side plates that form the third section channel is greater than the distance between the two layers of the second side plates that form the second section channel.

[0011] In the optional technical solution of the above-mentioned fire bar, the third section of the channel includes a first sub-channel and a second sub-channel that are connected to each other, the first sub-channel is connected to the second section of the channel, the distance between the two layers of second side panels that form part of the first sub-channel is greater than the distance between the two layers of second side panels that form part of the second section of the channel; the two layers of second side panels that form part of the first sub-channel are respectively provided with the via holes; the distance between the two layers of second side panels that form part of the first sub-channel is greater than the distance between the two layers of second side panels that form part of the second sub-channel.

[0012] In an optional technical solution of the above-mentioned fire bar, the top end of the second sub-channel abuts against the top flat plate; the inner shell also includes a plurality of connecting strips, both ends of which are respectively connected to the ends of the two layers of second side panels that form the second sub-channel, and the plurality of connecting strips are arranged at intervals along the first direction.

[0013] In an optional technical solution of the above fire grate, a plurality of through holes are provided, the number of the through holes is the same as the number of the combustion holes, and the projection of each of the through holes on the top flat plate corresponds to one of the combustion holes.

[0014] The burner comprises: a combustion chamber and the above-mentioned fire grate, wherein the fire grate is fixed in the combustion chamber.

[0015] The gas water heater comprises: a water tank and the above-mentioned burner, and the water tank is installed on the top of the burner.

[0016] Those skilled in the art can understand that, the fire grate, burner and gas water heater of the present application, the fire grate includes an inner shell and an outer shell covering part of the outer side of the inner shell, a connected introduction channel and a main air flow channel are formed in the inner shell, the outer shell includes a top plate and two second side plates relatively spaced apart and arranged on the bottom surface of the top plate, ends of the second side plates are connected to the inner shell, a gap is formed between the second side plate and part of the inner shell located on the inner side of the second side plate to form an auxiliary air flow channel, and a through hole is provided on the inner shell forming the auxiliary air flow channel to connect the auxiliary air flow channel and the main air flow channel. A plurality of combustion holes are arranged on the top plate, and some of the combustion holes corresponding to the main airflow channel form main flame holes, and the mixed gas of gas and air is discharged from the main flame hole for combustion to form a main flame; some of the combustion holes corresponding to the auxiliary airflow channel form auxiliary flame holes, and the mixed gas of gas and air is discharged from the auxiliary flame hole for combustion to form an auxiliary flame; the cross-sectional area of ​​the auxiliary flame hole is smaller than the cross-sectional area of ​​the main flame hole, so that the flow rate of the mixed gas flowing out of the auxiliary flame hole is greater than the flow rate of the mixed gas flowing out of the main flame hole, the pressure of the mixed gas flowing out of the auxiliary flame hole is relatively large, and the mixed gas is not easy to disperse, so that the auxiliary flame has a good gathering effect and has a certain impact force, and the formed auxiliary flame has a certain limiting effect on the main flame, avoiding the main flame from dispersing outward, thereby improving the gathering effect of the flame, and further improving the working efficiency of the gas water heater. In the embodiment of the present application, it is only necessary to process and form the combustion holes on the top plate, and the main flame hole and the auxiliary flame hole are formed by dividing the main airflow channel and the auxiliary airflow channel, and the difficulty of processing and assembly is low, which is not only conducive to reducing costs, but also can make the errors of multiple combustion holes small, which is conducive to improving the consistency of flames. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following describes the optional implementation of the fire grate, burner and gas water heater of the present application with reference to the accompanying drawings.

[0018] Figure 1It is a schematic diagram of the structure of the fire grate provided in the embodiment of the present application;

[0019] Figure 2 is an exploded view of the fire bar provided in the embodiment of the present application;

[0020] Figure 3 This is a front view of the fire grate provided in the embodiment of the present application;

[0021] Figure 4 yes Figure 3 AA section view in;

[0022] Figure 5 yes Figure 4 Enlarged schematic diagram of the middle P region;

[0023] Figure 6 is a top view of the fire bar provided in an embodiment of the present application;

[0024] Figure 7 yes Figure 6 BB section view in;

[0025] Figure 8 yes Figure 7 Schematic enlargement of the mid-Q region.

[0026] In the attached figure:

[0027] 100: inner shell; 110: injection channel; 111: expansion section; 112: closing section; 113: mixing section; 120: main air flow channel; 121: first section channel; 122: second section channel; 123: third section channel; 1231: first sub-channel; 1232: second sub-channel; 130: through hole; 140: second side plate; 150: connecting strip;

[0028] 200: outer shell; 201: auxiliary air flow channel; 210: top plate; 211: combustion hole; 2111: main flame hole; 2112: auxiliary flame hole; 220: first side plate; 221: connecting plate portion; 222: auxiliary plate portion; 2221: convex bump; 2222: reinforcing rib; 223: transition plate portion. DETAILED DESCRIPTION

[0029] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0030] Secondly, it should be noted that in the description of the embodiments of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0031] In addition, it should be noted that in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] A gas water heater is a gas appliance that uses gas as fuel and burns mixed air and gas in a combustion chamber through a burner to generate high-temperature flue gas. The high-temperature flue gas flows through a heat exchanger and exchanges heat with cold water in the heat exchanger to prepare hot water. It is widely used because of its convenience and rapid hot water production. The top surface of the existing gas water heater's fire grate is an arc-shaped surface. An arc-shaped flame hole is provided on the arc-shaped top surface, and side panels are provided at both ends of the flame hole to achieve the purpose of controlling the flame shape. However, the arc-shaped flame hole easily causes the flame to diverge outward, and the side panel has a poor effect in limiting the flame shape, resulting in a poor flame gathering effect, which affects the heating efficiency of the gas water heater. In addition, the arc-shaped surface and the arc-shaped hole are difficult to process, and the processing error is large, which affects the uniformity and stability of the flame.

[0033] In view of this, the fire grate of the embodiment of the present application includes an inner shell and an outer shell, the outer shell is coated on the outer side of part of the inner shell, and an auxiliary airflow channel is formed between the outer shell and the inner shell, and a main airflow channel is formed in the inner shell; the top of the outer shell is a flat plate, which is provided with combustion holes; part of the combustion holes corresponding to the main airflow channel are main flame holes, and part of the combustion holes corresponding to the auxiliary airflow channel are auxiliary flame holes, and the auxiliary flame holes are located on both sides of the main flame hole, and the cross-sectional area of ​​the auxiliary flame hole is smaller than the cross-sectional area of ​​the main flame hole, so that the mixed gas of gas and air flows faster in the auxiliary flame hole, and the auxiliary flames formed on both sides of the main flame hole can block the main flame inside it, improve the gathering effect of the flame, and thus improve the heating efficiency of the gas water heater. In addition, the combustion holes are processed on the flat plate at the top of the shell, the processing difficulty is low, the consistency of the combustion holes is good, and the uniformity and stability of the flame are improved. In the embodiment of the present application, only the combustion holes need to be processed on the flat plate at the top of the shell, and the main flame holes and the auxiliary flame holes are formed by dividing the main airflow channel and the auxiliary airflow channel, and the processing and assembly difficulty is low, which is not only conducive to reducing costs, but also can further improve the consistency between multiple combustion holes.

[0034] The preferred technical solutions of the fire grate, burner and gas water heater of the present application are described below in conjunction with the accompanying drawings.

[0035] Figure 1 It is a schematic diagram of the structure of the fire grate provided in the embodiment of the present application; Figure 2 is an exploded view of the fire bar provided in the embodiment of the present application; Figure 3 This is a front view of the fire grate provided in the embodiment of the present application; Figure 4 yes Figure 3 AA section view in; Figure 5 yes Figure 4 Enlarged schematic diagram of the middle P region; Figure 6 is a top view of the fire bar provided in an embodiment of the present application; Figure 7 yes Figure 6 BB section view in; Figure 8 yes Figure 7 Schematic enlargement of the mid-Q region.

[0036] First, it should be noted that in the embodiment of the present application, the X direction is the left-right direction, the Y direction is the front-back direction, and the Z direction is the up-down direction. In the actual use of the gas water heater, the Z direction is the vertical direction.

[0037] Combination Figure 1 and Figure 2 An embodiment of the present application provides a fire grate, which includes: an inner shell 100 and an outer shell 200 covering a portion of the outer side of the inner shell 100. For example, the top portion of the inner shell 100 is covered in the outer shell 200, and the bottom portion of the inner shell 100 is exposed to the outside.

[0038] The housing 200 of the embodiment of the present application includes a top flat plate 210 and two first side plates 220 spaced apart on the bottom surface of the top flat plate 210, with a space between the two first side plates 220. Optionally, the top flat plate 210 and the two first side plates 220 are an integrally formed one-piece, which has high structural strength and is conducive to improving the airtightness of the auxiliary airflow channel 201.

[0039] Optionally, the top plate 210 is a long strip plate extending in the X direction to form multiple combustion units and increase the combustion area. The top plate 210 abuts against the top end surface of the inner shell 100, that is, the bottom surface of the top plate 210 abuts against the top end surface of the main airflow channel 120 of the inner shell 100. Figure 1 , Figure 2 as well as Figure 6, a plurality of combustion holes 211 are arranged at intervals along a first direction (corresponding to the X direction in the figure) on the top plate 210. A plurality of combustion units are arranged at intervals along the X direction on the top plate 210, and each combustion unit includes a plurality of combustion holes 211, for example, three or five combustion holes 211. The intervals between two adjacent combustion holes 211 in the same combustion unit are the same, and the intervals between two adjacent combustion units are the same, which can improve the uniformity of the flame. The interval between two adjacent combustion units is greater than the interval between two adjacent combustion holes 211 in the same combustion unit. The combustion unit formed by such an arrangement can make the flame burn in a concentrated manner in a partitioned manner, form multiple flames, and improve the stability of combustion.

[0040] The combustion hole 211 can be a circular hole, an elliptical hole, a waist-shaped hole, etc. Optionally, the combustion hole 211 is a long strip hole extending along the second direction (corresponding to the Y direction in the figure). This arrangement facilitates the partitioning of the combustion hole 211.

[0041] The top plate 210 of the embodiment of the present application is a plane, which is not only convenient for processing, but also helps to reduce the dimensional error of the combustion holes 211 and improve the uniformity of combustion; moreover, it enables all the combustion holes 211 to have the same combustion surface, thereby improving the consistency of the flame area, which in turn helps to improve the uniformity and stability of the flame.

[0042] The end of the first side plate 220 is connected to the inner shell 100, and there is a gap between the first side plate 220 and the part of the inner shell 100 located on the inner side of the first side plate 220, forming an auxiliary airflow channel 201. There is a gap between a partial area of ​​the first side plate 220 and the inner shell 100, forming an auxiliary airflow channel 201; a partial area of ​​the first side plate 220 is connected to the inner shell 100 to close the auxiliary airflow channel 201. In the embodiment of the present application, the bottom and the left and right side areas of the first side plate 220 are connected to the inner shell 100. Exemplarily, the first side plate 220 is welded to the inner shell 100, the connection method is stable, and there is no need to set up an additional sealing structure, which is conducive to simplifying the structure of the fire bar.

[0043] The part of the inner shell 100 forming the auxiliary air flow channel 201 is provided with a through hole 130 for connecting the auxiliary air flow channel 201 and the main air flow channel 120 , so that the mixed gas of the fuel gas and air in the main air flow channel 120 can enter the auxiliary air flow channel 201 through the through hole 130 .

[0044] It is understandable that there are two auxiliary airflow channels 201, which are respectively located at the front and rear sides of the main airflow channel 120. Therefore, the front and rear side walls of the main airflow channel 120 are respectively provided with vias 130.

[0045] The via hole 130 may be a circular hole, an elliptical hole, a polygonal hole, etc. For example, Figure 7 and Figure 8 The via hole 130 shown is a square hole. The embodiment of the present application does not limit the size of the cross-sectional area of ​​the via hole 130. The cross-sectional area of ​​the via hole 130 is a plane formed by cutting the via hole 130 along the XZ plane.

[0046] In some possible implementations, a plurality of through holes 130 are provided, and the number of through holes 130 is the same as the number of combustion holes 211. The projection of each through hole 130 on the top plate 210 corresponds to a combustion hole 211. In short, the position of the through hole 130 corresponds to the position of the combustion hole 211. Such a setting can make the mixed gas of fuel gas and air flow from the main gas flow 120 into the auxiliary gas flow channel 201 in a targeted manner, so that the mixed gas of the auxiliary flame hole 2112 is stable, and the stability of the auxiliary flame is ensured.

[0047] In some other possible implementations, the through hole 130 is a long strip hole extending along the X direction, and a plurality of the long strip holes are provided, the number of the long strip holes is the same as the number of the combustion units, and the projection of the long strip holes on the top plate 210 completely covers all the combustion holes 211 of a combustion unit. Such a configuration can not only stabilize the auxiliary flame of each combustion unit, but also facilitate processing.

[0048] Combination Figures 3 to 6 , the outlets of the auxiliary airflow channel 201 and the main airflow channel 120 are both facing upward. Some of the combustion holes 211 corresponding to the main airflow channel 120 form main flame holes 2111, and the mixed gas of gas and air is discharged from the main flame holes 2111 to burn and form a main flame; some of the combustion holes 211 corresponding to the auxiliary airflow channel 201 form auxiliary flame holes 2112, and the mixed gas of gas and air is discharged from the auxiliary flame holes 2112 to burn and form an auxiliary flame; the auxiliary flame holes 2112 are located on both sides of the main flame hole 2111, that is, the auxiliary flame is located on both sides of the main flame, and the main flame is confined inside the auxiliary flame.

[0049] The cross-sectional area of ​​the auxiliary flame hole 2112 of the embodiment of the present application is smaller than the cross-sectional area of ​​the main flame hole 2111. Among them, the cross-sectional area of ​​the auxiliary flame hole 2112 and the cross-sectional area of ​​the main flame hole 2111 are both cross-sectional areas formed by cutting the XY plane. Such an arrangement makes the flow rate of the mixed gas flowing out of the auxiliary flame hole 2112 greater than the flow rate of the mixed gas flowing out of the main flame hole 2111, the pressure of the mixed gas flowing out of the auxiliary flame hole 2112 is relatively large, and the mixed gas is not easy to disperse, so that the auxiliary flame has a good gathering effect and has a certain impact force. The formed auxiliary flame has a certain limiting effect on the main flame, preventing the main flame from dispersing outward, thereby improving the gathering effect of the flame, and then improving the working efficiency of the gas water heater.

[0050] In some embodiments, reference Figure 6The combustion hole 211 is a rectangular hole extending along the Y direction, the width of the rectangular hole along the X direction is a constant value, the length of the auxiliary flame hole 2112 along the Y direction is smaller than the length of the main flame hole 2111 along the Y direction, and the cross-sectional area of ​​the auxiliary flame hole 2112 is smaller than the cross-sectional area of ​​the main flame hole 2111.

[0051] Optionally, the ratio of the length of the auxiliary flame hole 2112 along the second direction (corresponding to the Y direction in the figure) to the length of the combustion hole 211 along the second direction is 20% to 35%, for example, the length of the auxiliary flame hole 2112 along the Y direction accounts for 30% of the length of the combustion hole 211 along the Y direction. This arrangement can avoid the auxiliary flame hole 2112 being too small, resulting in the auxiliary flame being too small to be easily ignited, easy to drift, and other problems.

[0052] It should be noted that the "length of the combustion hole 211 along the Y direction" here is the sum of the lengths of two auxiliary flame holes 2112 and one main flame hole 2111, that is, the length of the combustion hole 211 minus twice the thickness of the second side plate 140 of the inner shell 100.

[0053] Reference Figure 2 and Figure 3 , the first side plate 220 of the embodiment of the present application includes a connecting plate portion 221, an auxiliary plate portion 222 and a transition plate portion 223, and the transition plate portion 223 is used to connect the connecting plate portion 221 and the auxiliary plate portion 222. The connecting plate portion 221 is welded to the inner shell 100. There is a gap between the auxiliary plate portion 222 and the inner shell 100 to form an auxiliary airflow channel 201, the top of the auxiliary plate portion 222 is connected to the top flat plate 210, and the two side edges and the bottom end of the auxiliary plate portion 222 are respectively connected to the connecting plate portion 221 through the transition plate portion 223. Taking the direction and shape shown in the figure as an example, the auxiliary plate portion 222 is a rectangular plate, the length direction of which is the X direction, and the width direction of which is the Z direction; the bottom edge and the left and right sides of the auxiliary plate portion 222 are respectively connected to the connecting plate portion 221 through the transition plate portion 223, and the transition plate portions 223 on the left and right sides and the top of the connecting plate portion 221 are also connected to the top flat plate 210 to form a closed auxiliary airflow channel 201.

[0054] Combination Figure 4 and Figure 5 Since the connecting plate portion 221 is in contact with and welded to the inner shell 100 , there is a gap between the auxiliary plate portion 222 and the inner shell 100 to form the auxiliary air flow channel 201 , and therefore the transition plate portion 223 is an inclined plate.

[0055] like Figures 1 to 3As shown, the auxiliary plate portion 222 of the embodiment of the present application is provided with a plurality of convex hulls 2221 protruding toward the inner shell 100, and the plurality of convex hulls 2221 are arranged at intervals along the first direction (corresponding to the X direction in the figure). Exemplarily, along the X direction, the auxiliary plate portion 222 is provided with two convex hulls 2221 at intervals. The convex hull 2221 can be a circular convex hull, an elliptical convex hull, a polygonal convex hull, etc. Optionally, the convex hull 2221 is a circular convex hull for easy processing.

[0056] Combination Figure 4 and Figure 5 The convex hump 2221 abuts against the inner shell 100, so that the interval between the auxiliary plate portion 222 and the inner shell 100 can be ensured, and the size of the auxiliary air flow channel 201 along the Y direction can be ensured. The deformation of the auxiliary plate portion 222 affects the gas flow in the auxiliary air flow channel 201. In order to better play the role of abutment, the end of the convex hump 2221, that is, the end of the convex hump 2221 facing the inner shell 100, is a plane to increase the abutment surface and improve the abutment effect.

[0057] Of course, the provision of the convex hump 2221 can also increase the structural strength of the auxiliary plate portion 222 and prevent the auxiliary plate portion 222 from deforming.

[0058] In order to further improve the structural strength of the auxiliary plate portion 222, the embodiment of the present application further provides a reinforcing rib 2222 protruding toward the inner shell 100 on the auxiliary plate portion 222, and a gap is provided between the reinforcing rib 2222 and the inner shell 100. Optionally, one reinforcing rib 2222 may be provided, for example, the reinforcing rib 2222 may be a rib extending along the X direction, or a plurality of reinforcing ribs 2222 may be provided, and the plurality of reinforcing ribs 2222 are evenly spaced along the X direction. The embodiment of the present application does not limit the shape and size of the reinforcing rib 2222.

[0059] The first side panel 220 of the embodiment of the present application is welded to the inner shell 100 by setting a connecting plate portion 221. The connection method is stable and reliable and there is no need to additionally set up a sealing structure for the auxiliary air flow channel 201. The auxiliary air flow channel 201 is formed by setting a gap between the auxiliary plate portion 222 and the inner shell 100, and setting an inclined transition plate portion 223 to connect the auxiliary plate portion 222 and the connecting plate portion 221. The structural strength of the first side panel 220 can be improved.

[0060] The specific structure of the inner shell 100 according to the embodiment of the present application is described below.

[0061] The inner shell 100 of the embodiment of the present application forms a connected ejection channel 110 and a main airflow channel 120. In the embodiment of the present application, the ejection channel 110 is located below the main airflow channel 120. Optionally, the inner shell 100 includes two layers of second side panels 140, and parts of the two layers of second side panels 140 are welded, and parts of the two layers of second side panels 140 have gaps to form the ejection channel 110 and the main airflow channel 120. Figure 2 and Figure 3 The bottom edge, right side and left side of the second side plate 140 are welded, and the other left side has an inlet for forming the ejection channel 110. Of course, this is not a limitation on the position of the inlet of the ejection channel 110. The top edge of the second side plate 140 has an outlet for forming the main airflow channel 120.

[0062] like Figure 1 and Figure 2 As shown, the shape of the ejection channel 110 of the embodiment of the present application is roughly U-shaped and opens to the left side. This arrangement is to extend the flow distance of the gas and air so that the gas and air can be fully mixed. The ejection channel 110 may include an expanding section 111, a closing section 112 and a mixing section 113 that are connected in sequence, wherein the cross-sectional area of ​​the expanding section 111 is larger than the cross-sectional area of ​​the closing section 112. The expanding section 111 with a larger cross-sectional area is not only convenient for connection with the air pipe, but also allows a large amount of air to enter; the closing section 112 with a smaller cross-sectional area increases the flow rate of the mixed gas, so that the mixed gas can quickly enter the mixing section 113.

[0063] The cross section of the mixing section 113 gradually increases, so that the flow rate of the mixed gas is reduced, so that the mixed gas can be fully mixed. The bending part of the mixing section 113 on the right side is changed to facilitate the flow toward the upper left; and the top of the mixing section 113 in the upper half is open along the X direction, and is connected to the main air flow channel 120, so as to provide mixed gas for all combustion holes 211 at the same time. From left to right along the X direction, the cross-sectional area of ​​the mixing section 113 in the upper half gradually decreases, in order to make the mixed gas entering the main air flow channel 120 more uniform along the X direction, thereby improving the consistency of the flames of multiple combustion holes 211.

[0064] It should be noted that the cross-section of the expanding section 111 , the cross-section of the closing section 112 , and the cross-section of the mixing section 113 are all cross-sections formed by cutting along the YZ plane.

[0065] Reference Figure 4 and Figure 5The main air flow channel 120 of the embodiment of the present application includes a first section channel 121, a second section channel 122 and a third section channel 123 which are connected in sequence; one end of the first section channel 121 is connected to the ejection channel 110, and the cross-sectional area of ​​the first section channel 121 is smaller than the cross-sectional area of ​​the ejection channel 110, and the cross-sectional area of ​​the first section channel 121 is smaller than the cross-sectional area of ​​the mixing section 113 of the ejection channel 110. Such a configuration makes the flow rate of the mixed gas entering the first section channel 121 large, and by changing the flow rate of the mixed gas, the uniformity of the mixed gas in the first section channel 121 in the X direction is improved, thereby improving the uniformity of the mixed gas ejected from each combustion hole 211, and finally improving the consistency of the flame size of each combustion hole 211, avoiding the flame drift caused by the large difference in the flame size of the combustion hole 211, and affecting the heating efficiency of the gas water heater. The cross section of the first section channel 121 and the cross section of the mixing section 113 are still the cross sections formed by cutting the YZ plane.

[0066] The outer side surface of the part of the second side plate 140 forming the second section channel 122 is connected to the first side plate 220. For example, the upper part of the second side plate 140 forming the second section channel 122 is welded to the connecting plate portion 221 of the first side plate 220. The part of the second side plate 140 forming the third section channel 123 is spaced from the auxiliary plate portion 222 of the first side plate 220 to form an auxiliary airflow channel 201; the part of the two layers of the second side plates 140 forming the third section channel 123 are respectively provided with through holes 130.

[0067] The distance L2 between the two layers of the second side plates 140 forming the second section channel 122 is greater than the distance L1 between the two layers of the second side plates 140 forming the first section channel 121; the distance between the two layers of the second side plates 140 forming the third section channel 123 (for example, L3 and L4 in the drawings) is greater than the distance L2 between the two layers of the second side plates 140 forming the second section channel 122. In this way, the cross-sectional area of ​​the second section channel 122 is greater than the cross-sectional area of ​​the first section channel 121, and the cross-sectional area of ​​the third section channel 123 is greater than the cross-sectional area of ​​the second section channel 122. By changing the cross-sectional area of ​​the channel, the flow rate of the mixed gas is changed, thereby continuously improving the uniformity of the mixed gas along the X direction, and further improving the consistency of the flame size of each combustion hole 211.

[0068] Among them, the third section channel 123 includes a first sub-channel 1231 and a second sub-channel 1232 that are connected to each other. The first sub-channel 1231 is connected to the second section channel 122. The distance L3 between the two layers of second side panels 140 that form the first sub-channel 1231 is greater than the distance L2 between the two layers of second side panels 140 that form the second section channel 122. The two layers of second side panels 140 that form the first sub-channel 1231 are respectively provided with through holes 130. The distance L3 between the two layers of second side panels 140 that form the first sub-channel 1231 is greater than the distance L4 between the two layers of second side panels 1140 that form the second sub-channel 1232, and the distance L4 is also greater than the distance L2.

[0069] The third section channel 123 of the embodiment of the present application is provided with a first sub-channel 1231, so that the distance between the first sub-channel 1231 and the auxiliary plate portion 222 is relatively close, which facilitates the abutment between the convex bump 2221 and the part of the second side plate 140 forming the first sub-channel 1231; the distance L4 between the two layers of the second side plates 140 forming the second sub-channel 1232 becomes smaller, so that the interval between the part of the second side plate 140 and the relative auxiliary plate portion 222 becomes larger, which can change the mixed gas flow rate in the auxiliary air flow channel 201, so that the mixed gas flow rate of each auxiliary flame hole 2112 along the X direction is uniform, thereby improving the consistency of the auxiliary flame size.

[0070] In order to avoid turbulence caused by sudden changes in cross-sections between sections of the main air flow channel 120, transition channels are respectively arranged between the first section of the channel 121 and the second section of the channel 122, between the second section of the channel 122 and the first sub-channel 1231, and between the first sub-channel 1231 and the second sub-channel 1232 in the embodiment of the present application, and the part of the second side plate 140 forming the transition channel is an inclined plate.

[0071] The top end of the second sub-channel 1232 abuts against the top plate 210 , thereby dividing the combustion holes 211 provided on the top plate 210 into main flame holes 2111 and auxiliary flame holes 2112 .

[0072] Optional, combined Figure 2 The inner shell 100 further includes a plurality of connecting strips 150, both ends of which are respectively connected to the ends of the two layers of the second side plates 140 forming the second sub-channel 1232, for example, by welding. The plurality of connecting strips 150 are arranged at intervals along the first direction (corresponding to the X direction in the figure). By providing the connecting strips 150, it is ensured that the openings of the second sub-channel 1232 are consistent along the X direction, so that the flow rate of the mixed gas flowing out of the main flame hole 2111 is the same.

[0073] Of course, the opening at the top of the second sub-channel 1232 is a connecting strip 150 , which avoids increasing the resistance to the flow of the mixed gas and allows the mixed gas to flow out of the main flame hole 2111 smoothly.

[0074] The embodiment of the present application also provides a burner, which includes: a combustion chamber and the fire grate of the above embodiment, the fire grate is fixed in the combustion chamber. Among them, multiple fire grate can be arranged side by side in the combustion chamber to increase the combustion area, thereby improving the heating efficiency of the gas water heater. The structure, function and effect of the fire grate provided in this embodiment are the same as those in the above embodiment, and the details can be referred to the above embodiment, and will not be repeated here.

[0075] It should be noted that the burner of the embodiment of the present application can be applied to a gas water heater and can also be applied to a gas wall-mounted boiler.

[0076] The embodiment of the present application also provides a gas water heater, which includes: a water tank and the above-mentioned burner, the water tank is installed on the top of the burner, and the high-temperature flue gas generated by the combustion of the fire grate of the burner exchanges heat with the water tank, thereby heating the water in the water tank.

[0077] In summary, the fire grate of the burner of the gas water heater of the embodiment of the present application includes an inner shell 100 and an outer shell 200 covering part of the outer side of the inner shell 100, wherein a connected injection channel 110 and a main air flow channel 120 are formed in the inner shell 100, and the outer shell 200 includes a top plate 210 and two first side plates 220 relatively spaced apart and arranged on the bottom surface of the top plate 210, wherein the ends of the first side plates 220 are connected to the inner shell 100, and there is a gap between the first side plate 220 and the part of the inner shell 100 located on the inner side of the first side plate 220 to form an auxiliary air flow channel 201, and a through hole 130 is provided on the inner shell 100 forming the auxiliary air flow channel 201 to connect the auxiliary air flow channel 201 and the main air flow channel 120.

[0078] A plurality of combustion holes 211 are arranged on the top flat plate 210, and some of the combustion holes 211 corresponding to the main air flow channel 120 form main flame holes 2111, and the mixed gas of gas and air is discharged from the main flame holes 2111 to burn, forming a main flame; some of the combustion holes 211 corresponding to the auxiliary air flow channel 201 form auxiliary flame holes 2112, and the mixed gas of gas and air is discharged from the auxiliary flame holes 2112 to burn, forming an auxiliary flame; the cross-sectional area of ​​the auxiliary flame hole 2112 is smaller than the cross-sectional area of ​​the main flame hole 2111, so that the flow rate of the mixed gas flowing out of the auxiliary flame hole 2112 is greater than the flow rate of the mixed gas flowing out of the main flame hole 2111, the pressure of the mixed gas flowing out of the auxiliary flame hole 2112 is relatively large, and the mixed gas is not easy to disperse, so that the auxiliary flame has a good gathering effect and has a certain impact force, and the formed auxiliary flame has a certain limiting effect on the main flame, preventing the main flame from diverging outward, thereby improving the flame gathering effect, and then improving the working efficiency of the gas water heater.

[0079] In the embodiment of the present application, it is only necessary to process the combustion hole 211 on the top flat plate 210, and utilize the main air flow channel 120 and the auxiliary air flow channel 201 to divide and form the main flame hole 2111 and the auxiliary flame hole 2112. The processing and assembly difficulty is low, which is not only conducive to reducing costs, but also can reduce the error of multiple combustion holes 211, which is conducive to improving the consistency of the flame.

[0080] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A fire grate, characterized in that: include: An inner shell and an outer shell covering a portion of the outer side of the inner shell; An ejection channel and a main airflow channel are formed in the inner shell; The outer shell includes a top plate and two first side plates spaced apart on the bottom surface of the top plate, the top plate and the two first side plates are integrally formed, the ends of the first side plates are connected to the inner shell, and there is a gap between the first side plate and a portion of the inner shell located inside the first side plate to form an auxiliary airflow channel; the portion of the inner shell forming the auxiliary airflow channel is provided with a through hole connecting the auxiliary airflow channel and the main airflow channel; The top plate is provided with a plurality of combustion holes arranged at intervals along a first direction; the portion of the combustion holes corresponding to the main airflow channel forms a main flame hole, and the portion of the combustion holes corresponding to the auxiliary airflow channel forms an auxiliary flame hole, the auxiliary flame holes are located on both sides of the main flame hole, the cross-sectional area of ​​the auxiliary flame hole is smaller than the cross-sectional area of ​​the main flame hole, and the flow rate of the mixed gas flowing out of the auxiliary flame hole is greater than the flow rate of the mixed gas flowing out of the main flame hole; The top end of the inner shell abuts against the top flat plate to separate the combustion holes arranged on the top flat plate into the main flame holes and the auxiliary flame holes.

2. The fire bar according to claim 1, characterized in that: The combustion hole is a long strip-shaped hole extending along a second direction, and the second direction is perpendicular to the first direction; The ratio of the length of the auxiliary flame hole along the second direction to the length of the combustion hole along the second direction is 20% to 35%.

3. The fire bar according to claim 1, characterized in that: The first side plate includes a connecting plate portion, an auxiliary plate portion and a transition plate portion connecting the connecting plate portion and the auxiliary plate portion. There is a gap between the auxiliary plate portion and the inner shell to form the auxiliary airflow channel. The top of the auxiliary plate portion is connected to the top flat plate, and the two side edges and the bottom end of the auxiliary plate portion are respectively connected to the connecting plate portion through the transition plate portion; the connecting plate portion is welded to the inner shell.

4. The fire bar according to claim 3, characterized in that: The auxiliary plate portion is provided with a plurality of convex bumps protruding toward the inner shell, and the convex bumps are in contact with the inner shell, and the plurality of convex bumps are arranged at intervals along the first direction; The auxiliary plate portion is also provided with reinforcing ribs protruding toward the inner shell, and a gap is provided between the reinforcing ribs and the inner shell.

5. The fire bar according to any one of claims 1 to 4, characterized in that: The inner shell comprises two layers of second side plates, partial areas of the two layers of second side plates are contact welded, and partial areas of the two layers of second side plates have gaps to form the ejection channel and the main airflow channel; The main air flow channel comprises a first section channel, a second section channel and a third section channel which are connected in sequence; one end of the first section channel is connected to the ejection channel, and the cross-sectional area of ​​the first section channel is smaller than the cross-sectional area of ​​the ejection channel; The outer side surface of the second side panel forming the second section of the channel is connected to the first side panel, and the distance between the two layers of the second side panels forming the second section of the channel is greater than the distance between the two layers of the second side panels forming the first section of the channel; the second side panel forming the third section of the channel is spaced apart from the first side panel to form the auxiliary airflow channel; the two layers of the second side panels forming the third section of the channel are respectively provided with the via holes; the distance between the two layers of the second side panels forming the third section of the channel is greater than the distance between the two layers of the second side panels forming the second section of the channel.

6. The fire bar according to claim 5, characterized in that: The third section of the channel includes a first sub-channel and a second sub-channel that are connected to each other, the first sub-channel is connected to the second section of the channel, the distance between the two layers of second side plates that form part of the first sub-channel is greater than the distance between the two layers of second side plates that form part of the second section of the channel; the two layers of second side plates that form part of the first sub-channel are respectively provided with the via holes; the distance between the two layers of second side plates that form part of the first sub-channel is greater than the distance between the two layers of second side plates that form part of the second sub-channel.

7. The fire bar according to claim 6, characterized in that: The top end of the second sub-channel is in contact with the top flat plate; the inner shell also includes a plurality of connecting strips, both ends of which are respectively connected to the ends of the two layers of second side panels forming the second sub-channel, and the plurality of connecting strips are arranged at intervals along the first direction.

8. The fire bar according to any one of claims 1 to 4, characterized in that: There are a plurality of via holes, the number of which is the same as the number of the combustion holes, and the projection of each via hole on the top plate corresponds to one combustion hole.

9. A burner, characterized in that: include: A combustion chamber and a fire grate as claimed in any one of claims 1 to 8, wherein the fire grate is fixed in the combustion chamber.

10. A gas water heater, characterized in that: include: A water tank and the burner as claimed in claim 9, wherein the water tank is installed at the top of the burner.

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