CN114440213A - Fire exhausts, burners and gas water heaters - Google Patents

Abstract

The application belongs to the technical field of water heaters, and particularly relates to a fire grate, a burner and a gas water heater. This application aims at solving the arc flame hole that current fire was arranged, leads to flame to gather together the poor problem of effect. The utility model provides a fire grate includes inner shell and shell, forms the injection passageway and the main airflow channel that are linked together in the inner shell, and the shell includes that the top is dull and stereotyped and two second curb plates, and the tip and the inner shell of second curb plate are connected, and the second curb plate forms the auxiliary airflow channel with being located between the inboard part inner shell of second curb plate to, be provided with the via hole on the inner shell that forms the auxiliary airflow channel, with intercommunication auxiliary airflow channel and main airflow channel. Be provided with a plurality of combustion holes on the flat board of top, the partial combustion hole that main gas flow path corresponds forms main flame hole, and the partial combustion hole that assists the gas flow path to correspond forms and assists the flame hole, and the cross sectional area who assists the flame hole is less than the cross sectional area of main flame hole, and the assistance flame that assists the flame hole to form can play the restriction effect to main flame to improve the effect of gathering together of flame.

Description

Fire exhausts, burners and gas water heaters

technical field

The application belongs to the technical field of water heaters, and in particular relates to a fire exhaust, a burner and a gas water heater.

Background technique

Gas water heater refers to the use of gas as fuel, the mixed air and gas are burned in the combustion chamber through the burner to generate high-temperature flue gas, and the high-temperature flue gas flows into the heat exchanger and exchanges heat with the cold water in the heat exchanger to prepare hot water. The purpose of a gas appliance is widely used because of its advantages of convenient use and rapid preparation of hot water.

The top surface of the fire row of the existing burner is an arc surface. An arc-shaped flame hole is set on the top surface of the arc, and side plates are respectively arranged at both ends of the flame hole to achieve the purpose of controlling the flame shape.

However, the arc-shaped flame holes are likely to cause the flame to radiate outward, and the flame shape restriction effect of the side plate is poor, resulting in poor flame gathering effect and affecting the heating efficiency of the gas water heater.

SUMMARY OF THE INVENTION

In order to solve the above problems in the prior art, that is, to solve the problem of poor flame gathering effect caused by the arc-shaped flame holes of the existing fire exhaust, the present application provides a fire exhaust, a burner and a gas water heater.

The fire exhaust includes: an inner shell and an outer shell that is covered on a part of the outer side of the inner shell; the inner shell is formed with a connected ejection channel and a main air flow channel; the outer shell includes a top flat plate and a Two first side plates on the bottom surface of the top plate, the top plate is in contact with the top end of the inner casing, the end of the first side plate is connected with the inner casing, and the first side plate is connected to the inner casing. The part of the inner shell on the inner side of the first side plate has a space between them to form an auxiliary airflow channel; the part of the inner shell that forms the auxiliary airflow channel is provided with a connection connecting the auxiliary airflow channel and the main airflow channel. through holes; the top plate is provided with a plurality of combustion holes spaced along the first direction; a part of the combustion holes corresponding to the main air flow channel forms a main flame hole, and a part of the combustion holes corresponding to the auxiliary air flow channel The holes form auxiliary flame holes, the auxiliary flame holes are located on both sides of the main flame hole, and the cross-sectional area of the auxiliary flame holes is smaller than the cross-sectional area of the main flame holes.

In the optional technical solution of the above-mentioned fire row, the combustion hole is an elongated hole extending along a second direction, and the second direction is perpendicular to the first direction; the auxiliary flame hole is along the second direction. The ratio of the length of the direction to the length of the combustion hole along the second direction is 20% to 35%.

In the optional technical solution of the above fire row, 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 the auxiliary plate portion is connected to the auxiliary plate portion. There is a space between the inner shells to form the auxiliary airflow 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 connected to the transition plate portion through the transition plate portion respectively. The connecting plate parts are connected; the connecting plate parts are welded with the inner shell.

In the optional technical solution of the above-mentioned fire row, a plurality of convex hulls protruding toward the inner shell are provided on the auxiliary plate portion, and the convex hulls are in contact with the inner shell, and a plurality of the convex hulls are provided. The bags are arranged at intervals along the first direction; the auxiliary plate portion is further provided with a reinforcing rib protruding toward the inner shell, and there is a gap between the reinforcing rib and the inner shell.

In the optional technical solution of the above-mentioned fire row, the inner shell includes two layers of second side plates, and partial regions of the two layers of second side plates are contact-welded, and some regions of the two layers of second side plates have a gap The introduction channel and the main air flow channel are formed; the main air flow channel includes a first-stage channel, a second-stage channel and a third-stage channel that are communicated in sequence; one end of the first-stage channel is connected to the The cross-sectional area of the first-stage channel is smaller than the cross-sectional area of the ejection channel; the outer surface of the second side plate forming part of the second-stage channel is connected to the first side plate connected, the distance between the two layers of second side plates forming the part of the second channel is greater than the distance between the two layers of the second side plates forming the part of the first channel; forming the first channel Part of the second side plate of the three-stage channel is spaced from the first side plate to form the auxiliary airflow channel; part of the two-layer second side plate forming the third-stage channel is provided with the A via hole; the distance between the part of the second side plates forming the third channel is greater than the distance between the two second side plates forming the part of the second channel.

In an optional technical solution of the above-mentioned fire row, the third channel includes a first subchannel and a second subchannel that communicate with each other, and the first subchannel communicates with the second channel to form part of the The distance between the two layers of second side plates of the first sub-channel is greater than the distance between the two layers of second side plates that form part of the second channel; The two layers of the second side plates are respectively provided with the via holes; the distance between the two layers of the second side plates forming the first sub-channel is greater than the distance between the two layers forming the second sub-channel part The distance between the second side panels.

In the optional technical solution of the fire row, the top end of the second sub-channel is in contact with the top plate; the inner shell further includes a plurality of connecting bars, and the two ends of the connecting bars are Parts of the second sub-channels are connected to the ends of the two layers of the second side plates, and a plurality of the connecting bars are arranged at intervals along the first direction.

In the optional technical solution of the above fire row, there are a plurality of the via holes, the number of the via holes is the same as the number of the combustion holes, and the projection of each via hole on the top plate corresponds to one of the burn holes.

The burner includes a combustion chamber and the above-mentioned fire row, and the fire row is fixed in the combustion chamber.

The gas water heater includes a water tank and the above-mentioned burner, and the water tank is installed on the top of the burner.

Those skilled in the art can understand that, in the fire exhaust, burner and gas water heater of the present application, the fire exhaust includes an inner shell and an outer shell wrapped on the outside of part of the inner shell, and the inner shell forms a communicating ejection channel and main airflow The channel, the outer shell includes a top plate and two second side plates arranged at a relative interval on the bottom surface of the top plate, the end of the second side plate is connected with the inner shell, and the second side plate is located inside the second side plate. There is a space between them to form an auxiliary airflow channel, and the inner shell forming the auxiliary airflow channel is provided with a through hole to communicate with the auxiliary airflow channel and the main airflow channel. The top plate is provided with a plurality of combustion holes, some of the combustion holes corresponding to the main air flow channel form the main flame hole, and the mixed gas of gas and air is discharged from the main flame hole to form the main flame; the part of the combustion holes corresponding to the auxiliary air flow channel forms the auxiliary flame hole. Flame hole, the mixed gas of gas and air is discharged and burned from the auxiliary flame hole to form an auxiliary flame; the cross-sectional area of the auxiliary flame hole is smaller than that of the main flame hole, so that the flow rate of the mixed gas flowing out of the auxiliary flame hole is greater than that of the main flame hole. The mixed gas flow rate is high, the pressure of the mixed gas flowing out of the auxiliary flame hole is large, and the mixed gas is not easy to disperse, so that the auxiliary flame has a good gathering effect and a certain impact force, and the formed auxiliary flame has a certain limiting effect on the main flame. The main flame radiates outward, thereby improving the gathering effect of the flame, thereby improving the working efficiency of the gas water heater. In the embodiment of the present application, it is only necessary to process the top plate to form the combustion hole, and use the main air flow channel and the auxiliary air flow channel to divide the main flame hole and auxiliary flame hole to form the main flame hole and auxiliary flame hole. The error of the combustion hole is small, which is beneficial to improve the consistency of the flame.

Description of drawings

The optional embodiments of the fire exhaust, the burner and the gas water heater of the present application will be described below with reference to the accompanying drawings. Attached is:

1 is a schematic structural diagram of a fire row provided by an embodiment of the present application;

2 is an exploded view of a fire row provided by an embodiment of the present application;

3 is a front view of a fire row provided by an embodiment of the present application;

Fig. 4 is A-A sectional view in Fig. 3;

Fig. 5 is the enlarged schematic diagram of P region in Fig. 4;

6 is a top view of a fire row provided by an embodiment of the present application;

Fig. 7 is B-B sectional view in Fig. 6;

FIG. 8 is an enlarged schematic view of the Q region in FIG. 7 .

In the attached picture:

100: inner shell; 110: ejection channel; 111: flared section; 112: closed section; 113: mixing section; 120: main airflow channel; 121: first channel; 122: second channel; 123: first Three-stage channel; 1231: first sub-channel; 1232: second sub-channel; 130: via hole; 140: second side plate; 150: connecting strip;

200: shell; 201: auxiliary airflow channel; 210: top plate; 211: combustion hole; 2111: main flame hole; 2112: auxiliary flame hole; 220: first side plate; 221: connecting plate part; 222: auxiliary plate part ; 2221: convex hull; 2222: reinforcing ribs; 223: transition plate.

Detailed ways

First of all, those skilled in the art should understand that these embodiments 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 adjust it as needed to adapt to specific applications.

Secondly, it should be noted that, in the description of the embodiments of the present application, the terms of direction or positional relationship indicated by the terms "inner" and "outer" are based on the direction or positional relationship shown in the drawings, which is only for convenience It is described, not indicated or implied, that the device or component must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

In addition, it should be noted that, in the description of the embodiments of the present application, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a Removal connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and 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 specific situations.

Gas water heater refers to the use of gas as fuel, the mixed air and gas are burned in the combustion chamber through the burner to generate high-temperature flue gas, and the high-temperature flue gas flows into the heat exchanger and exchanges heat with the cold water in the heat exchanger to prepare hot water. The purpose of a gas appliance is widely used because of its advantages of convenient use and rapid preparation of hot water. The top surface of the fire row of the existing gas water heater is an arc surface. An arc-shaped flame hole is set on the top surface of the arc, and side plates are respectively arranged at both ends of the flame hole to achieve the purpose of controlling the flame shape. However, the arc-shaped flame holes are likely to cause the flame to radiate outward, and the flame shape restriction effect of the side plate is poor, resulting in poor flame gathering effect and affecting the heating efficiency of the gas water heater. In addition, the processing of the curved surface and the curved hole is relatively difficult, and the processing error is large, which affects the uniformity and stability of the flame.

In view of this, the fire exhaust of the embodiment of the present application includes an inner shell and an outer shell, the outer shell is wrapped on the outer side of part of the inner shell, 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; It is a flat plate and is provided with combustion holes; the part of the combustion holes corresponding to the main air flow channel is the main flame hole, and the part of the combustion holes corresponding to the auxiliary air flow channel is the auxiliary flame hole, and the auxiliary flame holes are located on both sides of the main flame hole, and the auxiliary flame holes The cross-sectional area of the main flame hole is smaller than that of the main flame hole, so the flow rate of the mixture of gas and air in the auxiliary flame hole is faster, and the formation of auxiliary flames on both sides of the main flame hole can block the main flame inside and improve the flame. the gathering effect, thereby improving the heating efficiency of the gas water heater. Moreover, by processing the combustion holes on the flat plate on the top of the casing, the processing difficulty is low, the consistency of the combustion holes is good, and the uniformity and stability of the flame are improved. The embodiment of the present application only needs to process the combustion hole on the flat plate on the top of the casing, and the main flame hole and the auxiliary flame hole are formed by dividing the main air flow channel and the auxiliary air flow channel. The difficulty of processing and assembly is low, which is not only conducive to reducing costs, but also can further improve the efficiency of production. Consistency between burn holes.

The preferred technical solutions of the fire exhaust, the burner and the gas water heater of the present application will be described below with reference to the accompanying drawings.

1 is a schematic structural diagram of a fire row provided by an embodiment of the present application; FIG. 2 is an exploded view of a fire row provided by an embodiment of the present application; FIG. 3 is a front view of the fire row provided by an embodiment of the present application; FIG. 4 is FIG. 3 Figure 5 is an enlarged schematic view of the P region in Figure 4; Figure 6 is a top view of a fire row provided in an embodiment of the application; Figure 7 is a B-B cross-sectional view in Figure 6; Figure 8 is a view of the Q region in Figure 7. Enlarge the schematic.

First of all, it should be noted that, in the embodiments of the present application, the X direction is the left-right direction, the Y direction is the front-rear direction, and the Z direction is the up-down direction. In the actual use process of the gas water heater, the Z direction is the vertical direction.

With reference to FIGS. 1 and 2 , an embodiment of the present application provides a fire extinguisher, which includes: an inner shell 100 and an outer shell 200 covering a part of the outer side of the inner shell 100 . Exemplarily, the top part of the inner shell 100 is covered with the outer shell. 200, the bottom portion of the inner case 100 is exposed to the outside.

The housing 200 of the embodiment of the present application includes a top plate 210 and two first side plates 220 disposed on the bottom surface of the top plate 210 at intervals, and there is a space between the two first side plates 220 . Optionally, the top flat plate 210 and the two first side plates 220 are integrally formed as one piece, which has high structural strength and is beneficial to improve the airtightness of the auxiliary airflow channel 201 .

Optionally, the top plate 210 is an elongated plate extending along the X direction, so as to form multiple combustion units and increase the combustion area. The top flat plate 210 is in contact with the top end of the inner case 100 , that is, the bottom surface of the top flat plate 210 is in contact with the top end surface of the main airflow channel 120 of the inner case 100 . Referring to FIG. 1 , FIG. 2 and FIG. 6 , the top flat plate 210 is provided with a plurality of combustion holes 211 spaced along the first direction (corresponding to the X direction in the figure). The top plate 210 is provided with a plurality of combustion units at intervals along the X direction, and each combustion unit includes a plurality of combustion holes 211 , for example, three or five combustion holes 211 and the like. The interval between two adjacent combustion holes 211 in the same combustion unit is the same, and the interval between two adjacent combustion units is 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 formation of combustion units in this way can make the flames burn in zones, form multiple flames, and improve combustion stability.

The combustion hole 211 can be a circular hole, an oval hole, a waist-shaped hole, etc. Optionally, the combustion hole 211 is an elongated hole extending along the second direction (corresponding to the Y direction in the figure). 211 for partitioning.

The top plate 210 of the embodiment of the present application is flat, which is not only convenient for processing, but also helps to reduce the size error of the combustion holes 211 and improve the uniformity of combustion; moreover, all the combustion holes 211 have the same combustion surface, so that the flame can be improved. The uniformity of the area, which in turn helps to improve the uniformity and stability of the flame.

An end of the first side plate 220 is connected to the inner casing 100 , and there is a space between the first side plate 220 and a part of the inner casing 100 located inside the first side plate 220 to form an auxiliary airflow channel 201 . A part of the first side plate 220 is spaced from the inner casing 100 to form an auxiliary airflow channel 201 ; a part of the first side plate 220 is connected to the inner casing 100 to close the auxiliary airflow channel 201 . In the embodiment of the present application, the bottom and the left and right side regions of the first side plate 220 are both connected to the inner casing 100 . Exemplarily, the first side plate 220 is welded with the inner shell 100, the connection is stable, and no additional sealing structure is required, which is beneficial to simplify the structure of the fire exhaust.

A part of the inner casing 100 forming the auxiliary airflow channel 201 is provided with a through hole 130 for connecting the auxiliary airflow channel 201 and the main airflow channel 120, so that the mixed gas of fuel gas and air in the main airflow channel 120 can enter the auxiliary airflow through the through hole 130. Airflow channel 201 .

It can be understood that there are two auxiliary airflow channels 201 , which are located on the front and rear sides of the main airflow channel 120 respectively. Therefore, the front and rear side walls of the main airflow channel 120 are respectively provided with via holes 130 .

The via holes 130 may be circular holes, oval holes, polygonal holes, etc. For example, the via holes 130 shown in FIGS. 7 and 8 are square holes. The embodiment of the present application does not limit the size of the cross-sectional area of the via hole 130 . The cross section of the via hole 130 is a plane formed by cutting the via hole 130 on the XZ plane.

In some possible implementations, there are multiple via holes 130 , the number of via holes 130 is the same as the number of combustion holes 211 , and the projection of each via hole 130 on the top plate 210 corresponds to one combustion hole 211 , in short , the positions of the via holes 130 correspond to the positions of the combustion holes 211 one-to-one. This arrangement can make the mixed gas of fuel gas and air flow from the main gas to 120 and enter the auxiliary gas flow channel 201 in a targeted manner, so that the mixed gas in the auxiliary flame hole 2112 is stable, and the stability of the auxiliary flame is ensured.

In other possible implementations, the via hole 130 is an elongated hole extending along the X direction, and there are multiple elongated holes, the number of elongated holes is the same as that of the combustion units, and the elongated holes are on the top plate The projection of 210 completely covers all the combustion holes 211 of a combustion unit. This arrangement can not only stabilize the auxiliary flame of each combustion unit, but also facilitate processing.

Referring to FIGS. 3 to 6 , the outlets of the auxiliary airflow channel 201 and the main airflow channel 120 are both upward. The part of the combustion holes 211 corresponding to the main airflow channel 120 forms the main flame holes 2111, and the mixed gas of gas and air is discharged from the main flame holes 2111 for combustion to form the main flame; the partial combustion holes 211 corresponding to the auxiliary airflow channel 201 form auxiliary flame holes 2112, The mixture of gas and air is discharged and burned from the auxiliary flame hole 2112 to form an auxiliary flame; the auxiliary flame hole 2112 is 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 limited to the auxiliary flame. Inside the flame.

The cross-sectional area of the auxiliary flame hole 2112 in the embodiment of the present application is smaller than the cross-sectional area of the main flame hole 2111 . The cross-section of the auxiliary flame hole 2112 and the cross-section of the main flame hole 2111 are both cross-sections formed by cutting the XY plane. In this way, 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 diverge, so that the auxiliary flame has a good gathering effect, and It has a certain impact force, and the auxiliary flame formed has a certain limiting effect on the main flame, preventing the main flame from spreading outward, thereby improving the flame gathering effect, thereby improving the working efficiency of the gas water heater.

In some embodiments, referring to FIG. 6 , the combustion hole 211 is a rectangular hole extending in the Y direction, the width of the rectangular hole in the X direction is a fixed value, and the length of the auxiliary flame hole 2112 in the Y direction is smaller than the length of the main flame hole 2111 in the Y direction. length, the cross-sectional area of the auxiliary flame hole 2112 is smaller than the cross-sectional area of the main flame hole 2111 .

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 It accounts for 30% of the length of the combustion hole 211 in the Y direction. Such arrangement can avoid problems such as the auxiliary flame hole 2112 being too small, which causes the auxiliary flame to be too small to be easily ignited and easy to drift.

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

2 and 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 case 100 . There is a space between the auxiliary plate portion 222 and the inner shell 100 to form an auxiliary airflow channel 201. The top end of the auxiliary plate portion 222 is connected to the top flat plate 210. The connection plate portion 221 is connected. Taking the direction and shape shown in the figure as an example, the auxiliary plate portion 222 is a rectangular plate, its length direction is the X direction, and its width direction is the Z direction; the bottom edge and the left and right sides of the auxiliary plate portion 222 pass through the transition The plate portion 223 is connected with the connecting plate portion 221 , and the transition plate portions 223 on the left and right sides and the top ends of the connecting plate portion 221 are also connected with the top flat plate 210 to form a closed auxiliary airflow channel 201 .

4 and 5 , since the connecting plate portion 221 is in contact with the inner casing 100 and welded, there is a gap between the auxiliary plate portion 222 and the inner casing 100 to form the auxiliary airflow channel 201 , so the transition plate portion 223 is an inclined plate.

As shown in FIGS. 1 to 3 , 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 along the first direction (corresponding to the X direction in the figure). ) at intervals. Exemplarily, along the X direction, two convex hulls 2221 are provided at intervals on the auxiliary plate portion 222 . The convex hull 2221 may be a circular convex hull, an elliptical convex hull, a polygonal convex hull, or the like. Optionally, the convex hull 2221 is a circular convex hull, which is convenient for processing.

4 and 5, the convex hull 2221 is in contact with 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 passage 201 along the Y direction can be ensured. The deformation of the auxiliary plate portion 222 affects the The gas flows in the auxiliary gas flow channel 201 . In order to play a better abutting role, the end of the convex hull 2221 , that is, the end of the convex hull 2221 facing the inner shell 100 , is flat, so as to increase a larger abutting surface and improve the abutting effect.

Of course, the arrangement of the convex hull 2221 can also play a role in increasing the structural strength of the auxiliary plate portion 222 and prevent the auxiliary plate portion 222 from being deformed.

In order to further improve the structural strength of the auxiliary plate portion 222 , in the embodiment of the present application, a reinforcing rib 2222 protruding toward the inner shell 100 is further provided on the auxiliary plate portion 222 , and there is a gap 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 may be evenly spaced along the X direction layout. The embodiment of the present application does not limit the shape and size of the reinforcing rib 2222 .

In the embodiment of the present application, the first side plate 220 is welded with the inner shell 100 by setting the connecting plate portion 221 , and the connection is stable and reliable, and no additional sealing structure of the auxiliary air passage 201 is required; The auxiliary air passages 201 are formed at intervals, and the inclined transition plate portion 223 is provided to connect the auxiliary plate portion 222 and the connecting plate portion 221 , which can improve the structural strength of the first side plate 220 .

The specific structure of the inner case 100 in this embodiment of the present application will be described below.

In the inner casing 100 of the embodiment of the present application, the ejection channel 110 and the main air flow channel 120 are formed in communication with each other. 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 plates 140 , parts of the two layers of the second side plates 140 are welded, and some areas of the two layers of the second side plates 140 have gaps to form the ejection channel 110 and the main airflow channel 120 . . In FIG. 2 and FIG. 3 , the bottom, right and left parts of the second side plate 140 are welded, and the other part of the left has inlets that form the ejection channels 110 at intervals. Of course, this is not an inlet to the ejection channels 110 location restrictions. The top edge of the second side plate 140 has outlets that form the main airflow channel 120 at intervals.

As shown in FIG. 1 and FIG. 2 , the shape of the ejection channel 110 in the embodiment of the present application is roughly U-shaped and opens toward the left side, so that the flow path of the gas and the air can be extended, so that the gas and the air can be fully mix. The ejection channel 110 may include a flared section 111 , a closed section 112 and a mixing section 113 communicated in sequence, wherein the cross-sectional area of the flared section 111 is larger than the cross-sectional area of the closed section 112 , and the flared section with a larger cross-sectional area has a larger cross-sectional area. 111 not only facilitates the connection with the trachea, 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 enter the mixing section 113 quickly.

The cross section of the mixing section 113 is gradually increased, so that the flow rate of the mixed gas is reduced, so that the mixed gas can be fully mixed. The curved part of the mixing section 113 on the right side is easy to change and flows toward the upper left; and the top end of the mixing section 113 of the upper half section is opened along the X direction, and both communicate with the main airflow channel 120, so as to provide mixed gas for all the 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 is gradually reduced, in order to make the mixed gas entering the main airflow channel 120 more uniform along the X direction, thereby improving the flame of the multiple combustion holes 211. consistency.

It should be noted that the cross section of the flared section 111 , the cross section of the closed section 112 and the cross section of the mixing section 113 are all sections formed by cutting the YZ plane.

4 and 5 , the main airflow channel 120 in the embodiment of the present application includes a first-stage channel 121, a second-stage channel 122, and a third-stage channel 123 that are connected in sequence; one end of the first-stage channel 121 is connected to the ejection channel 110 is connected, the cross-sectional area of the first-stage channel 121 is smaller than the cross-sectional area of the ejection channel 110, and the cross-sectional area of the first-stage channel 121 is smaller than the cross-sectional area of the mixing section 113 of the ejection channel 110. The flow rate of the mixed gas in the first-stage channel 121 is large. By changing the flow rate of the mixed gas, the uniformity of the mixed gas in the X-direction of the first-stage channel 121 is improved, thereby improving the uniformity of the mixed gas ejected from each combustion hole 211. Therefore, the consistency of the flame size of each combustion hole 211 is finally improved, so as to prevent the flame from drifting due to the large difference in the flame size of the combustion hole 211, which affects the heating efficiency of the gas water heater. The cross-section of the first passage 121 and the cross-section of the mixing section 113 are still the cross-sections formed by cutting the YZ plane.

Part of the outer side of the second side plate 140 that forms the second channel 122 is connected to the first side plate 220 , for example, the upper part of the region of the second side plate 140 that forms the second channel 122 is connected to the first side plate 220 The plate portion 221 is welded. Part of the second side plate 140 forming the third stage channel 123 is spaced apart from the auxiliary plate portion 222 of the first side plate 220 to form the auxiliary airflow channel 201; part of the second side plate 140 forming the third stage channel 123 is provided with two layers respectively There are vias 130 .

The distance L2 between the part of the second side plates 140 forming the second stage channel 122 is greater than the distance L1 between the part forming the first stage channel 121 and the two layers of the second side plates 140; the part forming the third stage channel 123 The distance between the two layers of the second side plates 140 (eg, L3 and L4 in the drawings) is greater than the distance L2 between the two layers of the second side plates 140 forming part of the second channel 122 . In this way, the cross-sectional area of the second-stage channel 122 is larger than the cross-sectional area of the first-stage channel 121, and the cross-sectional area of the third-stage channel 123 is larger than the cross-sectional area of the second-stage channel 122. By changing the cross-sectional area of the channel , changing the flow rate of the mixed gas, so as to continuously improve the uniformity of the mixed gas along the X direction, thereby improving the consistency of the flame size of each combustion hole 211 .

The third channel 123 includes a first subchannel 1231 and a second subchannel 1232 that communicate with each other. The first subchannel 1231 is communicated with the second channel 122 to form part of the first subchannel 1231 with two layers of second side plates. The distance L3 between the second side plates 140 is greater than the distance L2 between the part of the second side plates 140 that form the second channel 122; the part of the two layers of the second side plates 140 that form the first sub-channel 1231 are respectively provided with via holes 130; The distance L3 between the part of the second side plates 140 forming the first sub-channel 1231 is greater than the distance L4 between the part of the second side plates 1140 forming the second sub-channel 1232, and the distance L4 is also greater than the distance L2.

The first sub-channel 1231 is provided in the third channel 123 in the embodiment of the present application, so that the distance between the first sub-channel 1231 and the auxiliary plate portion 222 is relatively close, which is convenient for the convex hull 2221 and the part of the second side plate forming the first sub-channel 1231 140 abuts; the distance L4 between the part 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 opposite auxiliary plate part 222 becomes larger, which can The flow rate of the mixed gas in the auxiliary gas flow channel 201 is changed, so that the flow rate of the mixed gas in each auxiliary flame hole 2112 along the X direction is uniform, and the consistency of the size of the auxiliary flame is improved.

In order to avoid turbulent flow caused by the sudden change of the cross section between the sections of the main airflow channel 120 , in the embodiment of the present application, between the first section channel 121 and the second section channel 122 and between the second section channel 122 and the first sub-channel 1231 A transition channel is respectively provided between the first sub-channel 1231 and the second sub-channel 1232, and a part of the second side plate 140 forming the transition channel is an inclined plate.

The top end of the second sub-channel 1232 is in contact with the top plate 210 , thereby dividing the combustion hole 211 provided on the top plate 210 into the main flame hole 2111 and the auxiliary flame hole 2112 .

Optionally, referring to FIG. 2 , the inner shell 100 further includes a plurality of connecting bars 150 , and both ends of the connecting bars 150 are respectively connected with the ends of the two-layer second side plates 140 forming the second sub-channel 1232 , for example, by welding . The plurality of connecting bars 150 are arranged at intervals along the first direction (corresponding to the X direction in the figure). By arranging the connecting bars 150, it is ensured that the openings of the second sub-channels 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.

Of course, the opening at the top of the second sub-channel 1232 is the connecting bar 150 to avoid increasing the resistance of the flow of the mixed gas, so that the mixed gas can flow out of the main flame hole 2111 smoothly.

Embodiments of the present application further provide a burner, which includes: a combustion chamber and the fire row of the above-mentioned embodiments, where the fire row is fixed in the combustion chamber. Among them, a plurality of fire rows 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 row provided in this embodiment are the same as those in the above-mentioned embodiment, and the specific reference may be made to the above-mentioned embodiment, which will not be repeated here.

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-hung boiler.

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 formed by the combustion of the fire exhaust of the burner exchanges heat with the water tank, thereby heating the water in the water tank. water.

To sum up, the fire exhaust of the burner of the gas water heater according to the embodiment of the present application includes the inner shell 100 and the outer shell 200 covering part of the outer shell of the inner shell 100 . For the airflow channel 120, the outer casing 200 includes a top plate 210 and two first side plates 220 arranged at a relative interval on the bottom surface of the top plate 210. A part of the inner shell 100 on the inner side of the side plate 220 is spaced to form the auxiliary airflow channel 201 , and the inner shell 100 forming the auxiliary airflow channel 201 is provided with a through hole 130 to communicate with the auxiliary airflow channel 201 and the main airflow channel 120 .

The top plate 210 is provided with a plurality of combustion holes 211, and some of the combustion holes 211 corresponding to the main air flow channel 120 form the main flame holes 2111, and the mixed gas of gas and air is discharged and burned from the main flame holes 2111 to form the main flame; the auxiliary air flow channel 201 The corresponding part of the combustion holes 211 form auxiliary flame holes 2112, and the mixed gas of gas and air is discharged and burned from the auxiliary flame holes 2112 to form auxiliary flames; the cross-sectional area of the auxiliary flame holes 2112 is smaller than that of the main flame holes 2111, so that the auxiliary flame The flow rate of the mixed gas flowing out of the 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. , the formed auxiliary flame has a certain limiting effect on the main flame, preventing the main flame from spreading outwards, thereby improving the flame gathering effect, thereby improving the working efficiency of the gas water heater.

In the embodiment of the present application, only the top plate 210 needs to be processed to form the combustion hole 211, and the main air flow channel 120 and the auxiliary air flow channel 201 are used to divide the main flame hole 2111 and the auxiliary flame hole 2112 to form the main flame hole 2111 and the auxiliary flame hole 2112. The difficulty of processing and assembly is low, which is not only conducive to reducing costs , it can also make the error of the plurality of combustion holes 211 small, which is beneficial to improve the consistency of the flame.

So far, the technical solutions of the present application have been described with reference to the preferred embodiments shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. On the premise of not 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 (10)

1. A fire grate, comprising: the outer shell is coated on the outer side of part of the inner shell;

an injection passage and a main air flow passage communicated with each other are formed in the inner shell;

the outer shell comprises a top flat plate and two first side plates arranged on the bottom surface of the top flat plate at intervals, the top flat plate is abutted to the top end of the inner shell, the end parts of the first side plates are connected with the inner shell, and an interval is formed between the first side plates and part of the inner shell positioned on the inner side of the first side plates to form an auxiliary air flow channel; the part of the inner shell forming the auxiliary air flow channel is provided with a through hole for communicating the auxiliary air flow channel with the main air flow channel;

the top flat plate is provided with a plurality of combustion holes which are arranged at intervals along a first direction; and the combustion holes corresponding to the main gas flow channel form main flame holes, the combustion holes corresponding to the auxiliary gas flow channel form auxiliary flame holes, the auxiliary flame holes are positioned at two sides of the main flame holes, and the cross section area of the auxiliary flame holes is smaller than that of the main flame holes.

2. The fire grate of claim 1, wherein the combustion holes are elongated holes extending in a second direction, the second direction being perpendicular to the first direction;

the ratio of the length of the auxiliary flame holes along the second direction to the length of the combustion holes along the second direction is 20-35%.

3. The fire grate of claim 1, wherein the first side plate comprises a connecting plate portion, an auxiliary plate portion, and a transition plate portion connecting the connecting plate portion and the auxiliary plate portion, the auxiliary plate portion and the inner shell have a space therebetween to form the auxiliary air flow passage, a top end of the auxiliary plate portion is connected to the top plate, and two side edges and a bottom end of the auxiliary plate portion are connected to the connecting plate portion through the transition plate portion, respectively; the connecting plate portion is welded to the inner case.

4. The fire grate of claim 3, wherein the auxiliary plate portion is provided with a plurality of convex hulls protruding toward the inner casing, the convex hulls abutting against the inner casing, the convex hulls being spaced apart in the first direction;

still be provided with on the supplementary board portion towards the protruding strengthening rib of inner shell, strengthening rib with have the clearance between the inner shell.

5. A fire grate as claimed in any one of claims 1 to 4 wherein the inner casing comprises two layers of secondary side plates, part of the regions of the two layers of secondary side plates being welded in contact, part of the regions of the two layers of secondary side plates having gaps forming the bleed passage and the main air flow passage;

the main air flow channel comprises a first section channel, a second section channel and a third section channel which are communicated in sequence; one end of the first section of passage is communicated with the injection passage, and the cross section area of the first section of passage is smaller than that of the injection passage; the outer side face of the part of the second side plate forming the second section of channel is connected with the first side plate, and the distance between the two layers of the second side plates forming the second section of channel is larger than the distance between the two layers of the second side plates forming the first section of channel; a part of the second side plate forming the third section channel is spaced from the first side plate to form the auxiliary air flow channel; the parts of the two second side plates forming the third section of channel are respectively provided with the through holes; the distance between the two second side plates of the part forming the third section of the channel is larger than the distance between the two second side plates of the part forming the second section of the channel.

6. The fire grate of claim 5, wherein the third section of the channel comprises a first sub-channel and a second sub-channel which are communicated, the first sub-channel is communicated with the second section of the channel, and the distance between the two second side plates forming part of the first sub-channel is larger than the distance between the two second side plates forming part of the second section of the channel; the parts of the two layers of second side plates forming the first sub-channels are respectively provided with the through holes; the distance between the two second side plates forming part of the first sub-channel is larger than the distance between the two second side plates forming part of the second sub-channel.

7. The fire grate of claim 6 wherein the top end of the second sub-channel abuts the top plate; the inner shell further comprises a plurality of connecting strips, two ends of each connecting strip are respectively connected with the end portions of the two layers of second side plates forming the second sub-channels, and the connecting strips are arranged at intervals along the first direction.

8. The fire grate of any one of claims 1 to 4, wherein a plurality of through holes are arranged, the number of the through holes is the same as that of the combustion holes, and the projection of each through hole on the top flat plate corresponds to one combustion hole respectively.

9. A burner, comprising: a combustion chamber and a fire grate as claimed in any one of claims 1 to 8, said fire grate being fixed within said combustion chamber.

10. A gas water heater, comprising: a water tank and the burner of claim 9, said water tank being mounted on the top end of said burner.

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