Heating device for gas water heater

Abstract

The utility model belongs to the technical field of gas water heaters, and particularly relates to a heating device for a gas water heater, which comprises a heat exchange shell with a flue gas channel, an inverted burner and a heat exchange tube are arranged in the flue gas channel, a gas premixer is arranged at the top of the heat exchange shell, a gas outlet of the gas premixer is communicated with a gas inlet end of the inverted burner, and a gas outlet of the gas premixer is communicated with a gas outlet end of the heat exchange tube. The inner top face of the heat exchange shell hunches upwards to form a funnel-shaped curved face, a gas outlet of the gas premixer is communicated with a small funnel opening of the funnel-shaped curved face, the inverted burner is located below a large funnel opening of the funnel-shaped curved face, and a gas mixing cavity is formed between the inverted burner and the funnel-shaped curved face. According to the utility model, the structure of the inner top surface of the heat exchange shell is reasonably optimized, and the distance between the inverted burner and the gas outlet of the gas premixer is increased by virtue of the funnel-shaped curved surface, so that fuel in mixed gas can be fully mixed with air; and meanwhile, the mixed fuel gas can be guided to uniformly flow to the inverted combustor, so that uniform combustion of the inverted combustor is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas water heater technical field, especially point to a kind of heating device for gas water heater. BACKGROUND

[0002] The existing Chinese utility model patent (authorized announcement number CN213578145U) discloses a heating device for gas water heater, which comprises a main box body with a flue gas passage, an inverted burner provided on the main box body and having a nozzle located in the flue gas passage, and a heat exchange pipe located below the inverted burner and horizontally and transversely arranged in the flue gas passage. The main box body is provided with a flow passage having a water inlet and a water outlet, and the flow passage is adjacent to the heat exchange pipe. The flue gas passage is provided with a smoke outlet. A condensate water collection cavity is formed in the flue gas passage below the heat exchange pipe. The main box body is provided with a condensate water outlet. Furthermore, it also comprises a gas premixer. The gas premixer is provided with a gas mixing chamber. The gas premixer is provided with an air inlet port, an air inlet port and an air outlet port which are in communication with the gas mixing chamber. The air outlet port is in communication with the air inlet port of the inverted burner. The air inlet port is in communication with the air outlet port of the fan. The air inlet port is in communication with the external gas source. That is, the gas is mixed with air in the gas premixer to form mixed gas, and the mixed gas enters the flue gas passage of the main box body for combustion by the inverted burner.

[0003] However, in actual operation, it is found that the gas is combusted in the inverted burner before it is fully mixed with air, and the combustion flame on the inverted burner is not uniform. After repeated investigation of the structure, it is found that the technical defect causing the above problems is that the distance between the inverted burner and the air outlet port of the gas premixer is too short, that is, the mixed gas formed by the gas premixer has not had time to mix and disperse in the flue gas passage before entering the inverted burner for combustion. SUMMARY

[0004] The utility model aims at providing a heating device for gas water heater, which optimizes the structure of the top surface of the heat exchange shell, increases the distance between the inverted burner and the air outlet port of the gas premixer by means of the funnel-shaped curved surface, ensures that the fuel and air in the mixed gas can be fully mixed, and also guides the mixed gas to flow uniformly to the inverted burner, so as to ensure the uniform combustion of the inverted burner.

[0005] The utility model is realized as follows:

[0006] A heating device for a gas water heater, comprising a heat exchange housing with a flue gas passage, a reversed burner and a heat exchange tube being arranged in the flue gas passage from top to bottom in sequence, the top of the heat exchange housing is provided with a gas premixer, the gas outlet of the gas premixer is communicated with the gas inlet end of the reversed burner, the inner top surface of the heat exchange housing is arched upward to form a funnel-shaped surface with a small opening of the funnel being located above a large opening of the funnel, the gas outlet of the gas premixer is communicated with the small opening of the funnel-shaped surface, the reversed burner is located below the large opening of the funnel-shaped surface, and a gas mixing cavity is formed between the reversed burner and the funnel-shaped surface.

[0007] In the heating device for a gas water heater, the reversed burner is arranged on the flue gas passage through a mounting support, and the reversed burner and the mounting support separate the flue gas passage vertically, and the reversed burner is located at the central position below the large opening of the funnel-shaped surface.

[0008] In the heating device for a gas water heater, a mixing space is arranged between the large opening of the funnel-shaped surface and the reversed burner.

[0009] In the heating device for a gas water heater, the mixing space is greater than or equal to one third of the distance between the large opening and the small opening of the funnel-shaped surface.

[0010] In the heating device for a gas water heater, a flow passage is arranged on the heat exchange housing and communicated with the heat exchange tube, and the two ends of the flow passage are respectively a water inlet and a water outlet, the heat exchange tube comprises a flat heat exchange tube transversely penetrating the flue gas passage and a circular heat exchange tube located below the flat heat exchange tube, the long axis of the flat heat exchange tube is arranged vertically, and a plurality of flat heat exchange tubes are arranged side by side, a plurality of heat exchange fins are arranged side by side in the transverse direction in the flue gas passage, and the flat heat exchange tubes arranged side by side are penetrated and matched on each heat exchange fin, and a plurality of circular heat exchange tubes are arranged at equal intervals, and the outer wall surface of the circular heat exchange tube is a smooth surface.

[0011] In the heating device for a gas water heater, the circular heat exchange tube and the flat heat exchange tube are communicated through the water passing cavity arranged on the heat exchange housing to form a circular heat exchange flow channel and a flat heat exchange flow channel, the flow passage sequentially comprises a water inlet channel, the circular heat exchange flow channel and the flat heat exchange flow channel from the water inlet to the water outlet, the water inlet channel is transversely arranged on the heat exchange housing between the reversed burner and the heat exchange tube, the end of the water inlet channel is communicated with the first end of the circular heat exchange tube through a pipeline, the end of the circular heat exchange tube is communicated with the first end of the flat heat exchange flow channel, and the water outlet is the end of the flat heat exchange flow channel.

[0012] Compared with the prior art, the utility model has the advantages of:

[0013] The utility model discloses simple structure, clever design and low cost, through the reasonable optimization heat exchange casing inner top surface structure, with the help funnel -shaped surface increase inverted combustor and gas premixing ware gas outlet between the interval, to ensure that the fuel in mixed gas can be fully mixed with air, can also guide mixed gas even flow to inverted combustor, to ensure the even combustion of inverted combustor. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the overall perspective of the utility model;

[0015] Figure 2 It is the overall sectional view of the utility model.

[0016] In the drawing: 1, heat exchange casing;2, inverted combustor;3, gas premixing ware;4, funnel -shaped surface;5, gas mixing chamber;6, assembly support plate;7, water inlet;8, water outlet;9, flat heat exchange pipe;10, circular heat exchange pipe;11, heat exchange fin;12, water passing chamber;13, water inlet channel;L, mixing interval. DETAILED DESCRIPTION

[0017] The utility model will be further described with specific embodiments below, refer to Figure 1 -2:

[0018] A kind of heating device for gas water heater, including the heat exchange casing 1 with flue gas passage, flue gas passage is sequentially provided with inverted combustor 2 and heat exchange tube from top to bottom, the top of heat exchange casing 1 is equipped with gas premixing ware 3, the gas outlet of gas premixing ware 3 is communicated with the gas inlet end of inverted combustor 2, the inner top surface of heat exchange casing 1 is arched upwards, to form funnel -shaped surface 4 with funnel small mouth located above funnel big mouth, the gas outlet of gas premixing ware 3 is communicated with the funnel small mouth of funnel -shaped surface 4, the inverted combustor 2 is located below the funnel big mouth of funnel -shaped surface 4, and the gas mixing chamber 5 is formed between inverted combustor 2 and funnel -shaped surface 4.

[0019] The utility model discloses simple structure, clever design and low cost, through the reasonable optimization heat exchange casing 1 inner top surface structure, with the help funnel -shaped surface 4 increase inverted combustor 2 and gas premixing ware 3 gas outlet between the interval, to ensure that the fuel in mixed gas can be fully mixed with air, can also guide mixed gas even flow to inverted combustor 2, to ensure the even combustion of inverted combustor 2.

[0020] Further, to make inverted combustor 2 can evenly receive mixed gas in gas mixing chamber 5, the inverted combustor 2 is erected on flue gas passage by assembly support plate 6, and inverted combustor 2 and assembly support plate 6 are separated up and down flue gas passage, and the inverted combustor 2 is located at the central and just below the funnel big mouth of funnel -shaped surface 4.

[0021] At the same time, in order to make the mixed gas have a certain gap space to uniformly disperse at the edge of the funnel large mouth, the funnel large mouth of the funnel-shaped curved surface 4 and the inverted burner 2 have a certain distance mixed gap L.

[0022] Further, in the embodiment, the mixed gap L is greater than or equal to one third of the distance between the funnel large mouth and the funnel small mouth of the funnel-shaped curved surface 4.

[0023] In order to improve the heat exchange efficiency of the heat exchange pipe, the circular heat exchange pipe 10 and the flat heat exchange pipe 9 are reasonably selected, the heat exchange shell 1 is provided with a flow-through channel communicating with the heat exchange pipe and having the water inlet 7 and the water outlet 8 at both ends, the heat exchange pipe includes the flat heat exchange pipe 9 transversely penetrating the flue gas passage and the circular heat exchange pipe 10 located directly below the flat heat exchange pipe 9, the long axis of the flat heat exchange pipe 9 is arranged vertically and a plurality of flat heat exchange pipes 9 are arranged side by side, a plurality of heat exchange fins 11 are arranged side by side in the transverse direction in the flue gas passage, and the flat heat exchange pipe 9 arranged side by side is penetrated and matched on each heat exchange fin 11, a plurality of circular heat exchange pipes 10 are arranged at equal intervals, and the outer wall surface of the circular heat exchange pipe 10 is a smooth surface. That is, the high-temperature flue gas first exchanges heat through the flat heat exchange pipe 9 and the heat exchange fin 11, and then exchanges heat through the circular heat exchange pipe 10. Correspondingly, the circular heat exchange pipe 10 and the flat heat exchange pipe 9 are communicated through the water passing chamber 12 provided on the heat exchange shell 1 to form a circular heat exchange flow channel and a flat heat exchange flow channel, the flow-through channel sequentially includes the water inlet channel 13, the circular heat exchange flow channel and the flat heat exchange flow channel from the water inlet 7 to the water outlet 8, the water inlet channel 13 is transversely arranged on the heat exchange shell 1 between the inverted burner 2 and the heat exchange pipe, the end of the water inlet channel 13 is communicated with the first end of the circular heat exchange pipe 10 through a pipeline, the end of the circular heat exchange pipe 10 is communicated with the first end of the flat heat exchange flow channel, and the water outlet 8 is the end of the flat heat exchange flow channel.

[0024] The above embodiment is only one of the preferred embodiments of the present application, and does not limit the scope of the present application, so that: any equivalent changes made according to the shape, structure and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A heating device for a gas water heater, comprising a heat exchange shell (1) having a flue gas passage, an inverted burner (2) and a heat exchange tube being arranged in the flue gas passage in sequence from top to bottom, the top of the heat exchange shell (1) being provided with a gas premixer (3), the gas outlet of the gas premixer (3) being communicated with the gas inlet end of the inverted burner (2), characterized in that: The inner top surface of the heat exchange shell (1) is arched upward to form a funnel-shaped surface (4) with a small opening above a large opening, the gas outlet of the gas premixer (3) communicates with the small opening of the funnel-shaped surface (4), and the inverted burner (2) is located below the large opening of the funnel-shaped surface (4), forming a gas mixing cavity (5) between the inverted burner (2) and the funnel-shaped surface (4).

2. A heating device for a gas water heater as claimed in claim 1 wherein: The inverted burner (2) is erected on the flue gas passage through the assembly support plate (6), and the inverted burner (2) and the assembly support plate (6) separate the flue gas passage vertically, and the inverted burner (2) is located vertically below the center of the large opening of the funnel-shaped surface (4).

3. A heating device for a gas water heater as claimed in claim 1 or 2 wherein: There is a mixing distance (L) between the large opening of the funnel-shaped surface (4) and the inverted burner (2).

4. A heating device for a gas water heater as claimed in claim 3 wherein: The mixing distance (L) is greater than or equal to one-third of the distance between the large opening and the small opening of the funnel-shaped surface (4).

5. A heating device for a gas water heater as defined in claim 1, wherein: The heat exchange shell (1) is provided with a flow passage communicating with the heat exchange pipes and having a water inlet (7) and a water outlet (8) at both ends, the heat exchange pipes include flat heat exchange pipes (9) transversely penetrating the flue gas passage and circular heat exchange pipes (10) located vertically below the flat heat exchange pipes (9), the long axis of the flat heat exchange pipes (9) is arranged vertically and a plurality of flat heat exchange pipes (9) are arranged side by side, a plurality of heat exchange fins (11) are arranged side by side in the transverse direction in the flue gas passage, and the flat heat exchange pipes (9) arranged side by side penetrate each heat exchange fin (11), and a plurality of circular heat exchange pipes (10) are arranged at equal intervals, and the outer wall surface of the circular heat exchange pipes (10) is smooth.

6. A heating device for a gas water heater as claimed in claim 5 wherein: The circular heat exchange pipes (10) and the flat heat exchange pipes (9) are communicated by the water passing chamber (12) provided on the heat exchange shell (1) to form circular heat exchange flow channels and flat heat exchange flow channels, the flow passage sequentially includes a water inlet channel (13), the circular heat exchange flow channels and the flat heat exchange flow channels from the water inlet (7) to the water outlet (8), the water inlet channel (13) is transversely arranged on the heat exchange shell (1) between the inverted burner (2) and the heat exchange pipes, the end of the water inlet channel (13) is communicated with the first end of the circular heat exchange pipes (10) through a pipeline, the end of the circular heat exchange pipes (10) is communicated with the first end of the flat heat exchange flow channels, and the water outlet (8) is the end of the flat heat exchange flow channels.

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