Combustion device for water heater

Abstract

The utility model discloses a combustion device for a water heater, which comprises a combustion chamber assembly, a water heater assembly and a water heater assembly, the combustor assembly is arranged in the outer shell, and the combustor assembly comprises two fire grate sets which are symmetrically installed; and the gas distribution rod assembly vertically penetrates through the connecting opening and is connected with the connecting opening in a sealed mode, the upper end of the gas distribution rod assembly extends into the position between the lower ends of the two fire grate sets, and the upper end of the gas distribution rod assembly communicates with the two fire grate sets correspondingly. The whole width of the combustion device is smaller, and flattening of the whole water heater is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a combustion device for water heaters. Background Art

[0002] Common household gas water heater burners are primarily categorized by their air intake structure: bottom-intake burners and top-exhaust burners. Top-exhaust burners feature a hood fan located above the burner, drawing air required for combustion and heat exchange from the bottom of the burner through negative pressure. Bottom-intake burners, on the other hand, feature a hood fan located below the burner. When the fan is activated, positive pressure is created within the combustion chamber, providing the necessary air for combustion and heat exchange.

[0003] Taking the common 16L water heater products as an example, the rated load is 30kW, the number of burner plates in the upper exhaust structure is at least 7 rows, and the number of burner plates in the lower air inlet structure is basically more than 10 rows. There are gaps between each burner plate, including burner components with air-cooled and non-air-cooled structures. The width of the assembled burner is relatively large, and the matching heat exchanger and smoke hood fan are also correspondingly thicker, which restricts the development of water heater products towards thinness. Summary of the Invention

[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a combustion device for a water heater, which has a simple structure and a smaller overall width, thereby facilitating the flattening of the entire water heater.

[0005] According to the above-mentioned combustion device for a water heater, it is implemented by the following technical solutions:

[0006] A combustion device for a water heater comprises: a combustion chamber assembly, comprising an outer shell, a connecting port being provided at the bottom of the outer shell; a burner assembly, arranged in the outer shell, the burner assembly comprising two symmetrically installed fire bar groups; and a gas distribution rod assembly, vertically passing through the connecting port and sealedly connected to the connecting port, the upper end of the gas distribution rod assembly extending between the lower ends of the two fire bar groups, and the upper ends of the gas distribution rod assembly being respectively communicated with the two fire bar groups.

[0007] In some embodiments, a lower air cavity is formed between the bottom of the outer shell and the bottom of the burner assembly, and a mounting port communicating with the lower air cavity is provided at the bottom or the lower end of the side wall of the outer shell.

[0008] In some embodiments, the combustion chamber assembly further includes a partition assembly, wherein the partition assembly is disposed at the upper end of the interior of the outer shell, an external air cavity is formed between the partition assembly and the outer shell, an air inlet is provided at the bottom or lower end of the partition assembly, and an air outlet is provided at the upper end of the partition assembly, and the air outlet is communicated with the air inlet through the external air cavity.

[0009] In some embodiments, the burner assembly further comprises a fixing frame, the fixing frame being provided with two mounting cavities opened at upper and lower ends and an air dividing cavity opened downward, the air dividing cavity being located between the two mounting cavities and being arranged corresponding to the connecting port, and air inlets being respectively provided on the left and right cavity walls of the air dividing cavity; the two fire row groups are respectively embedded in the two mounting cavities, the upper end of the air dividing rod assembly extends into the air dividing cavity, and is connected with the corresponding fire row group through the air inlet.

[0010] In some embodiments, the fixed frame includes a fixed frame and two fixed side panels, the fixed frame is provided with the air dividing cavity opening downward and two U-shaped grooves located on the left and right outer sides of the air dividing cavity, the two fixed side panels are respectively connected and fixed to the left and right outer sides of the fixed frame, and the fixed side panels and the corresponding U-shaped grooves are enclosed to form the installation cavity.

[0011] In some embodiments, the burner assembly also includes a base plate, which is connected and fixed to the fixed frame and covers the lower end openings of the two installation cavities respectively. Ventilation hole groups are respectively provided on the left and right sides of the base plate. The two ventilation hole groups are respectively connected to the two installation cavities. An air-avoidance hole for the gas distribution rod assembly to pass vertically is provided at the position of the base plate corresponding to the connection port.

[0012] In some embodiments, the porosity of the two ventilation hole groups is different.

[0013] In some embodiments, the gas distribution rod assembly includes a gas distribution rod and two solenoid valves, the gas distribution rod is provided with a gas inlet, a normally open channel and two gas distribution channels, the gas inlet is respectively connected to the gas inlet end of the normally open channel and the gas inlet end of the two gas distribution channels, the gas outlet end of the normally open channel is respectively connected to the two fire row groups, the gas outlet end of the gas distribution channel is respectively connected to the two fire row groups, and the two solenoid valves are respectively arranged on the two gas distribution channels for controlling the on and off states of the two gas distribution channels.

[0014] In some embodiments, at least one pair of gas outlets is provided at the gas outlet end of the normally open channel and the gas outlet end of one of the gas distribution channels, and at least two pairs of gas outlets are provided at the gas outlet end of the other gas distribution channel, and each pair of gas outlets is respectively connected to two of the fire row groups.

[0015] In some embodiments, a sealing connection position is protruded from the outer surface of the gas distribution rod at a position corresponding to the connection port, and the sealing connection position is sealed with the connection port.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The combustion device of the present invention distributes the two fire row groups symmetrically in the outer shell, and extends the upper end of the gas distribution rod assembly through the connection port at the bottom of the outer shell and then extends between the two fire row groups. Under the same rated load condition, the overall width of the combustion device is smaller, which facilitates the flattening of the water heater and can meet the demand for a smaller and thinner water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a combustion device in an embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of the combustion device in the embodiment of the present utility model;

[0020] Figure 3 This is a cross-sectional view of a combustion device in an embodiment of the present utility model;

[0021] Figure 4 is an exploded view of a combustion chamber assembly in an embodiment of the present utility model;

[0022] Figure 5 is an exploded view of a burner assembly in an embodiment of the present utility model;

[0023] Figure 6 This is a structural diagram of a fixing frame in an embodiment of the present utility model;

[0024] Figure 7 This is a structural diagram of the gas distribution rod assembly in an embodiment of the present utility model;

[0025] Figure 8 It is a cross-sectional view of the gas distribution rod assembly in the embodiment of the present utility model.

[0026] In the figure: 1-combustion chamber assembly, 11-outer shell, 111-connection port, 112-installation port, 12-partition assembly, 121-front partition, 122-side partition, 123-rear partition;

[0027] 2-burner assembly, 21-fire row group, 211-burner single piece, 22-fixing frame, 221-fixing frame, 2211-gas distribution cavity, 2212-U-shaped groove, 2213-bend part, 2214-vent, 2215-flange, 222-fixed side plate, 23-bottom plate, 231-vent, 232-avoidance hole;

[0028] 3-gas distribution rod assembly, 31-gas distribution rod, 311-gas inlet, 312-normally open channel, 313-gas distribution channel, 314-gas outlet, 315-sealed connection position, 32-solenoid valve, 33-nozzle;

[0029] 41-lower air cavity, 42-outer air cavity. DETAILED DESCRIPTION

[0030] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0031] refer to Figure 1-5 This embodiment provides a combustion device for a water heater, including a combustion chamber assembly 1, a burner assembly 2 and a gas distribution rod assembly 3, wherein the combustion chamber assembly 1 includes an outer shell 11, the outer shell 11 having an upwardly open combustion cavity (not shown in the figure), and a connection port 111 connected to the combustion cavity is provided at the bottom of the outer shell 11. The burner assembly 2 is arranged in the combustion cavity of the outer shell 11, and the burner assembly 2 includes two symmetrically installed fire row groups 21, and the two fire row groups 21 are respectively arranged on the left and right sides of the lower end of the combustion cavity. Each fire row group 21 is composed of a plurality of burner monoliths 211 arranged side by side and spaced apart in the front-to-back direction, and each burner monolith 211 has an ejector tube. The gas distribution rod assembly 3 is vertically penetrated from bottom to top in the connection port 111 and is sealed with the connection port 111. The upper end of the gas distribution rod assembly 3 extends between the lower ends of the two fire row groups 21, and the upper end of the gas distribution rod assembly 3 is respectively connected to the two fire row groups 21.

[0032] It can be seen that by symmetrically distributing the two fire bar groups 21 in the outer shell 11, and extending the upper end of the gas distribution rod assembly 3 through the connection port 111 of the outer shell 11 and then extending between the two fire bar groups 21, under the same rated load condition, the overall width of the combustion device is smaller, which facilitates the flattening of the water heater as a whole and can meet the demand for a smaller and thinner water heater.

[0033] refer to Figure 2-4Furthermore, a lower air cavity 41 is formed between the bottom of the outer shell 11 and the bottom of the burner assembly 2, and a mounting port 112 connected to the lower air cavity 41 is provided at the bottom or lower end of the side wall of the outer shell 11. In this embodiment, the mounting port 112 is arranged at the bottom of the outer shell 11 and is located outside the left side of the connecting port 111. The mounting port 112 is configured to be used for installing a fan assembly, so that air is supplied from the fan assembly into the lower air cavity 41. Part of the air flows upward as secondary air and cooling airflow for gas combustion, and the other part of the air enters the gap between the gas distribution rod assembly 3 and the burner assembly 2, forming a mixed airflow of air and gas and flowing simultaneously to the fire row groups 21 on the left and right sides. After ignition and combustion, the combustion flame can be evenly distributed in the combustion chamber assembly 1.

[0034] refer to Figure 1-4 The outer shell 11 is made of sheet metal or other plate-like materials, and is composed of an outer shell bottom plate, a panel and a U-shaped enclosure. The outer shell bottom plate is connected and fixed to the bottom of the U-shaped enclosure. A connection port 111 and an installation port 112 are opened on the outer shell bottom plate, and the panel is respectively connected and fixed to the front of the U-shaped enclosure and the front of the outer shell bottom plate.

[0035] Furthermore, the combustion chamber assembly 1 also includes a partition assembly 12, which is arranged at the upper end of the interior of the outer shell 11 and is located on the outside of the upper end of the burner assembly 2. An external air cavity 42 is formed between the partition assembly 12 and the outer shell 11. An air inlet is provided at the bottom or lower end of the partition assembly 12, and an air outlet is provided at the upper end of the partition assembly 12. The air outlet is connected to the air inlet through the external air cavity 42, so that the combustion of gas generates high temperature. The partition assembly 12 itself plays a good heat-insulating role, and the formed external air cavity 42 further insulates, and the air flow inside the external air cavity 42 takes away the high-temperature heat of the part wall, ensuring that the external temperature of the combustion chamber assembly 1 is lower, better ensuring the reliability of product quality and the safety of use of the gas water heater.

[0036] In this embodiment, an outward protrusion (not shown in the figure) is provided at the position of the outer shell 11 corresponding to the partition assembly 12 to strengthen the strength of the outer shell 11 and can be used to install the partition assembly 12. In addition, it is also conducive to cooling without affecting the upward flow of high-temperature flue gas.

[0037] The partition assembly 12 includes at least one of a front partition 121, at least one side partition 122, and a rear partition 123. The front partition 121 is connected and fixed to the inner side of the front of the outer shell 11, forming an external air cavity 42 between the front partition 121 and the front of the outer shell 11. An air inlet and an air outlet are provided at the bottom and top of the front partition 121, respectively. The side partition 122 is connected and fixed to the inner side of the left or right side of the outer shell 11, forming an external air cavity 41 between the side partition 122 and the left or right side of the outer shell 11, and an air inlet and an air outlet are provided at the bottom and top of the side partition 122, respectively. The rear partition 123 is connected and fixed to the inner side of the back of the outer shell 11, forming an external air cavity 41 between the rear partition 123 and the back of the outer shell 11, and an air inlet and an air outlet are provided at the upper and lower ends of the rear partition 123, respectively.

[0038] refer to Figure 1-3 and Figure 5-6 Furthermore, the burner assembly 2 also includes a fixing frame 22, which is provided with two installation cavities (not shown in the figure) with upper and lower ends opening and a downwardly opening air dividing cavity 2211, the air dividing cavity 2211 is located between the two installation cavities and is arranged corresponding to the connecting port 111, and air inlets 2210 are respectively provided on the left and right cavity walls of the air dividing cavity 2211. In this embodiment, the number of air inlets 2210 on each side is corresponding to the number of burner single pieces 211 in the fire row group 21 and is arranged one-to-one. The two fire row groups 21 are respectively embedded in the two installation cavities. The ejector tube of the burner single chip 211 of each fire row group 21 is inserted into the corresponding air inlet 2210. The upper end of the gas distribution rod assembly 3 extends into the gas distribution cavity 2211. A plurality of nozzles 33 corresponding to the number of air inlets 2210 are provided on the left and right sides of the upper end of the gas distribution rod assembly 3. Each nozzle 22 is connected to the burner single chip 211 in the fire row group 21 through the corresponding air inlet 2210.

[0039] The fixing frame 22 includes a fixing frame 221 and two fixing side panels 222. In this embodiment, the fixing frame 221 is formed of sheet metal or other plate-like materials, and includes an inverted U-shaped fixing plate with an air dividing cavity 2211 and four baffles. The inverted U-shaped fixing plate has two oppositely arranged side edges, and the front and rear ends of each side edge are bent in a direction away from the air dividing cavity 2211 to form a baffle. In this way, the fixing frame 221 has a downwardly opening air dividing cavity 2211 and two U-shaped grooves 2212 located on the left and right outer sides of the air dividing cavity 2211. The inverted U-shaped fixing plate is used to fix the end of the fire row group 21 close to the air dividing cavity 2211. The two fixing side panels 222 are both formed of sheet metal or other plate-like materials. The two fixing side panels 222 are respectively connected and fixed to the left and right outer sides of the fixing frame 221. The fixing side panels 222 and the corresponding U-shaped grooves 2212 enclose a mounting cavity. The fixing side panels 222 are used to fix the end of the fire row group 21 away from the air dividing cavity.

[0040] In addition, the lower ends of the front and rear walls of the U-shaped groove 2212 are each provided with a bent portion 2213 extending inward therefrom. Specifically, the lower end of the baffle is bent toward the interior of the U-shaped groove 2212 to form the bent portion 2213. The bent portion 2213 is provided with a plurality of vents 2214. This bent portion 2213 serves to support the fire row assembly 21 and connect to the bottom plate 23, while also allowing air to pass through, thereby improving combustion efficiency. The free end of the baffle is bent toward the interior of the U-shaped groove 2212 to form a flange portion 2215, which is used to connect to and fix the side plate 222.

[0041] refer to Figure 5-6 Furthermore, the burner assembly 2 also includes a base plate 23. The base plate 23 is formed of sheet metal or other plate-like materials. It is connected and fixed to the fixed frame 22 and covers the lower end openings of the two installation cavities respectively. Ventilation hole groups are respectively provided on the left and right sides of the base plate 23. The two ventilation hole groups are arranged one-to-one corresponding to the two installation cavities respectively. Each installation cavity is connected to the lower air cavity 41 through the corresponding ventilation hole group. An air avoidance hole 232 for the gas distribution rod assembly 3 to pass vertically is provided at the position of the base plate 23 corresponding to the connection port 1111. Therefore, by adding the base plate 23 to the bottom of the fixed frame 22, on the one hand, the base plate 23 can be used to reliably support the two fire row groups 21, so that the installation of the fire row group 21 is more stable and reliable. On the other hand, it can achieve an air uniformity effect, so that the air flows evenly to the bottom of the fire row group 21, which is conducive to improving the completeness of combustion.

[0042] In this embodiment, the ventilation hole group comprises a plurality of ventilation holes 231 arranged evenly spaced apart. The two ventilation hole groups have different porosities, i.e., the ventilation holes 231 in the left and right ventilation hole groups have different distribution densities, thereby facilitating balanced air intake. It should be noted that in other embodiments, the bottom plate 23 may be omitted.

[0043] refer to Figure 1-3 and Figure 7-8 The gas distribution rod assembly 3 includes a gas distribution rod 31 and two solenoid valves 32. The upper end of the gas distribution rod 31 passes through the connecting port 111 from bottom to top and extends between the lower ends of the two fire bar groups 21. The gas distribution rod 31 is provided with a gas inlet 311, a normally open channel 312, and two gas distribution channels 313. The gas inlet 311 is respectively connected to the air inlet end of the normally open channel 312 and the air inlet end of the two gas distribution channels 313. The air outlet end of the normally open channel 312 is respectively connected to the two fire bar groups 21, and the air outlet end of the gas distribution channel 313 is respectively connected to the two fire bar groups 21. The two solenoid valves 32 are respectively provided on the two gas distribution channels 313 to control the on-off state of the two gas distribution channels 313, thereby controlling the gas output of the gas distribution rod 21.

[0044] At least one pair of gas outlets 314 is provided at the outlet end of the normally open channel 312 and at the outlet end of one of the gas branch channels 313. At least two pairs of gas outlets 314 are provided at the outlet end of the other gas branch channel 313. Each pair of gas outlets 314 is connected to the ejector pipes of the burner monoliths 211 in two fire bank groups 21. A nozzle 33 is installed at the gas outlet 314, and the gas outlet direction of the nozzle 33 is toward the ejector pipe of the corresponding burner monolith 211. Specifically, the number of pairs of gas outlets 314 is equal to the number of burner monoliths 211 in the fire bank group 21.

[0045] In addition, a sealing connection position 315 is protruded on the outer surface of the air distribution rod 31 at a position corresponding to the connection port 111. The sealing connection position 315 is sealed with the connection port 111 to seal the air distribution rod assembly 3 and the outer shell 11, ensuring that the connection is sealed and airtight.

[0046] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A combustion device for a water heater, characterized in that: include: A combustion chamber assembly (1) comprises an outer shell (11), wherein a connection port (111) is provided at the bottom of the outer shell (11); A burner assembly (2) is arranged in the outer shell (11), and the burner assembly (2) includes two symmetrically installed fire row groups (21); and The gas distribution rod assembly (3) is vertically arranged in the connecting port (111), and the upper end of the gas distribution rod assembly (3) extends between the lower ends of the two fire bar groups (21), and the upper end of the gas distribution rod assembly (3) is respectively connected to the two fire bar groups (21).

2. A combustion device for a water heater according to claim 1, characterized in that: A lower air cavity (41) is formed between the bottom of the outer shell (11) and the bottom of the burner assembly (2), and a mounting opening (112) communicating with the lower air cavity (41) is provided at the bottom or the lower end of the side wall of the outer shell (11).

3. A combustion device for a water heater according to claim 1 or 2, characterized in that: The combustion chamber assembly (1) further comprises a partition assembly (12), wherein the partition assembly (12) is arranged at the upper end inside the outer shell (11), an outer air cavity (42) is formed between the partition assembly (12) and the outer shell (11), an air inlet is provided at the bottom or lower end of the partition assembly (12), and an air outlet is provided at the upper end of the partition assembly (12), and the air outlet is connected to the air inlet through the outer air cavity (42).

4. A combustion device for a water heater according to claim 1, characterized in that: The burner assembly (2) further comprises a fixing frame (22), the fixing frame (22) being provided with two mounting cavities with upper and lower ends opening and an air separation cavity (2211) opening downwards, the air separation cavity (2211) being located between the two mounting cavities and arranged corresponding to the connecting port (111), and air inlets being respectively provided on the left and right walls of the air separation cavity (2211); the two fire row groups (21) being respectively embedded in the two mounting cavities, the upper end of the air separation rod assembly (3) extending into the air separation cavity (2211), and being communicated with the corresponding fire row group (21) through the air inlet.

5. A combustion device for a water heater according to claim 4, characterized in that: The fixing frame (22) comprises a fixing frame (221) and two fixing side plates (222); the fixing frame (221) is provided with the air dividing cavity (2211) opening downward and two U-shaped grooves (2212) located on the left and right outer sides of the air dividing cavity (2211); the two fixing side plates (222) are respectively connected and fixed to the left and right outer sides of the fixing frame (221); the fixing side plates (222) and the corresponding U-shaped grooves (2212) are enclosed to form the installation cavity.

6. The combustion device for a water heater according to claim 4, characterized in that: The burner assembly (2) further comprises a base plate (23), the base plate (23) being connected and fixed to the fixing frame (22) and covering the lower end openings of the two installation cavities respectively, a ventilation hole group being provided on the left and right sides of the base plate (23), the two ventilation hole groups being respectively connected to the two installation cavities, and an air avoidance hole (232) for the gas distribution rod assembly (3) to vertically pass through being provided at a position of the base plate (23) corresponding to the connection port (111).

7. A combustion device for a water heater according to claim 6, characterized in that: The porosity of the two ventilation hole groups is different.

8. The combustion device for a water heater according to claim 1, characterized in that: The gas distribution rod assembly (3) comprises a gas distribution rod (31) and two solenoid valves (32); the gas distribution rod (31) is provided with a gas inlet (311), a normally open channel (312) and two gas distribution channels (313); the gas inlet (311) is respectively connected to the gas inlet end of the normally open channel (312) and the gas inlet ends of the two gas distribution channels (313); the gas outlet end of the normally open channel (312) is respectively connected to the two fire bar groups (21); the gas outlet end of the gas distribution channel (313) is respectively connected to the two fire bar groups (21); the two solenoid valves (32) are respectively arranged on the two gas distribution channels (313) and are used to control the on / off state of the two gas distribution channels (313).

9. The combustion device for a water heater according to claim 8, characterized in that: At least one pair of gas outlets (314) is provided at the gas outlet end of the normally open channel (312) and the gas outlet end of one of the gas distribution channels (313), and at least two pairs of gas outlets (314) are provided at the gas outlet end of the other gas distribution channel (313), and each pair of gas outlets (314) is respectively connected to two of the fire row groups (21).

10. The combustion device for a water heater according to claim 8, characterized in that: A sealing connection position (315) is protrudingly provided on the outer surface of the gas distribution rod (31) at a position corresponding to the connection port (111), and the sealing connection position (315) is sealedly connected to the connection port (111).

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