Gas water heater

Abstract

The utility model discloses a gas water heater which comprises a shell, a combustor, a combustion chamber, a heat exchanger and an air draft device. The combustor, the combustion chamber, the heat exchanger and the air draft device are arranged in the shell. The gas water heater further comprises a water pipe flowing through the heat exchanger, the combustion chamber comprises an inner shell and an outer shell, a connecting structure is arranged between the inner shell and the outer shell, a gap is formed between the inner shell and the outer shell, a plurality of first air inlet holes are formed in the outer shell, the first air inlet holes are formed beside the connecting structure, and a first air inlet channel is formed in the inner shell. A fire outlet of the combustor communicates with an opening in the lower end of the combustion chamber, a temperature detection device is arranged at the output end of the water pipe, an air pressure detection device used for detecting air pressure in the fan assembly is arranged in the shell, and when the temperature detection device detects that the temperature reaches a first preset value or the air pressure detection device detects that the air pressure is lower than a second preset value, the rotating speed of the motor is increased; therefore, more air is sucked into the combustion chamber to maintain sufficient and stable combustion of flames, the situation that the flames are lengthened to damage the heat exchanger is avoided, when the rotating speed of the motor reaches the third preset value and the temperature reaches the fourth preset value, operation of the combustor is stopped, and then the temperature in the combustion chamber is maintained within the normal range.

Description

Technical Field

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

[0002] A gas water heater is a device that uses natural gas or liquefied petroleum gas as fuel to instantly heat water through the heat generated by combustion. Gas water heaters are widely used because they can quickly heat water, heat almost instantly, and have lower operating costs than ordinary electric water heaters.

[0003] The applicant has previously developed an air-cooled gas water heater that dissipates heat through air intake, but during use it was found that when the flue is blocked or the flue pipe is lengthened to a certain extent, the oxygen content in the combustion chamber gradually decreases. Insufficient oxygen will cause the flame to become unstable, and the flame will stretch or sway in an attempt to find more oxygen to maintain combustion. The elongated flame contacting the upper part of the combustion chamber can easily cause the heat exchange plate to overheat and deform, curl and block the flow channel; the high temperature in the combustion chamber diffuses outward, the combustion chamber is prone to discoloration and deformation, the plastic box undergoes thermoplastic deformation, the life of electronic components such as controllers is shortened and there are great safety hazards. At the same time, insufficient oxygen can lead to incomplete combustion and produce more toxic gases such as carbon monoxide, which is very harmful to human health.

[0004] The utility model is made based on the above situation. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art and provides a gas water heater which can adjust the air intake volume according to changes in wind pressure and temperature.

[0006] The utility model is realized by the following technical solutions:

[0007] A gas water heater comprises a shell, and a burner, a combustion chamber, a heat exchanger and an exhaust device arranged in the shell from bottom to top; the gas water heater also comprises a water pipe flowing through the heat exchanger, the combustion chamber comprises an inner shell with upper and lower openings and an outer shell sleeved on the outer side of the inner shell, a connecting structure for connecting the inner shell and the outer shell is provided between the inner shell and the outer shell, a gap is also provided between the inner shell and the outer shell, a plurality of first air inlet holes for allowing outside air to flow into the gap are provided on the outer shell, the first air inlet holes are arranged beside the connecting structure, a first air inlet channel for allowing wind in the gap to enter the inner cavity of the inner shell is provided on the inner shell, the fire outlet of the burner is connected to the lower opening of the combustion chamber, a temperature detection device for detecting temperature is provided at the output end of the water pipe, the exhaust device comprises a smoke collecting hood and a fan assembly, the fan assembly comprises a motor, the motor is a multi-speed motor, a wind pressure detection device for detecting wind pressure in the fan assembly is provided in the shell, and a controller is also provided in the shell that can increase the motor speed when it is detected that the temperature reaches a first preset value or the wind pressure is lower than a second preset value, and stops the burner operation when the motor speed reaches a third preset value and the temperature reaches a fourth preset value.

[0008] In the gas water heater as described above, the temperature detection device includes a thermostat or a temperature sensor.

[0009] In the gas water heater as described above, the wind pressure detection device includes a wind pressure switch or a wind pressure sensor.

[0010] In the above-mentioned gas water heater, the connection structure includes mounting holes provided on the outer shell and the inner shell, and a connection assembly that cooperates with the mounting holes to connect the outer shell and the inner shell.

[0011] In the gas water heater as described above, the connection assembly includes bolts and nuts, and positions corresponding to the mounting holes on the inner shell and the outer shell are provided with embedding grooves for embedding nuts or nuts of the bolts.

[0012] In the gas water heater as described above, the first air inlet hole is arranged beside the embedding groove.

[0013] In the gas water heater as described above, a guide slope for allowing wind to flow upward along the inner wall of the inner shell is provided at a position on the inner side of the inner shell corresponding to the first air inlet channel.

[0014] In the gas water heater as described above, the shell is further provided with a plurality of second air inlet channels for letting air into the gaps.

[0015] In the gas water heater as described above, a plurality of second air inlet channels are provided on each side wall of the outer shell, and a first air inlet channel is provided on each side wall of the inner shell.

[0016] In the gas water heater as described above, the burner is sealed to the combustion chamber, the upper end of the heat exchanger is sealed to the air inlet end of the smoke hood, and the lower end of the heat exchanger is sealed to the combustion chamber.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. A temperature detection device for detecting temperature is provided in the output end of the water pipe, a wind pressure detection device for detecting wind pressure in the fan assembly is provided in the shell, and a controller is also provided in the shell. When the temperature detection device detects that the temperature reaches a first preset value or the wind pressure detection device detects that the wind pressure is lower than a second preset value, the motor speed is increased, so that more air is drawn into the combustion chamber to maintain full and stable combustion of the flame, and to avoid the flame from being elongated and damaging the heat exchanger. When the motor speed reaches a third preset value and the temperature reaches a fourth preset value, the burner is stopped, thereby maintaining the temperature in the combustion chamber within a normal range.

[0019] 2. A gap is also provided between the inner shell and the outer shell. The outer shell is provided with a plurality of first air inlet holes that allow outside air to flow into the gap. The first air inlet holes are arranged next to the connecting structure. When the fan assembly is exhausting air, the air entering from the first air inlet holes will take away part of the heat of the connecting structure, thereby reducing the problem of heat accumulation at the connection. At the same time, the wind flows in the gap to form air cooling, which cools the surface of the combustion chamber, thereby improving the service life and reliability of the water heater.

[0020] 3. A guide slope is provided on the inner side of the inner shell at a position corresponding to the first air inlet channel, for allowing the wind to flow upward along the inner wall of the inner shell. The guide slope allows the wind to flow upward along the inner wall of the inner shell to form an air-cooled barrier, thereby further cooling the surface of the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0024] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0025] Figure 4 It is an exploded view of the inner shell in the utility model;

[0026] Figure 5 It is a cross-sectional view of the connection structure in the utility model. DETAILED DESCRIPTION

[0027] The present utility model will be further described below in conjunction with the accompanying drawings:

[0028] As Figures 1 to 5 shown, a gas water heater includes a housing 1, and a burner 2, a combustion chamber 3, a heat exchanger 4, and an air extraction device arranged in the housing 1 from bottom to top; the gas water heater further includes a water pipe 5 flowing through the heat exchanger 4, the combustion chamber 3 includes an inner shell 31 with openings at both the upper and lower ends and an outer shell 32 sleeved outside the inner shell 31, a connection structure 33 for connecting the two is provided between the inner shell 31 and the outer shell 32, a gap 34 is further provided between the inner shell 31 and the outer shell 32, the outer shell 32 is provided with a plurality of first air inlet holes 35 allowing outside air to flow into the gap 34, the first air inlet holes 35 are arranged beside the connection structure 33, the inner shell 31 is provided with a first air inlet channel 311 allowing the air in the gap 34 to enter the inner cavity of the inner shell 31, the fire outlet of the burner 2 is communicated with the lower end opening of the combustion chamber 3, a temperature detection device 6 for detecting temperature is arranged at the output end of the water pipe 5 or inside the combustion chamber 3, the air extraction device includes a smoke collecting hood 71 and a fan assembly 72, the fan assembly 72 includes a fan and a motor 721, the motor 721 is a multi-speed motor, a wind pressure detection device 8 for detecting the wind pressure inside the fan assembly 72 is arranged in the housing 1, and a controller 9 is further arranged in the housing 1, which can increase the speed of the motor 721 when the detected temperature reaches a first preset value or the detected wind pressure is lower than a second preset value, and stop the operation of the burner 2 when the speed of the motor 721 reaches a third preset value and the temperature reaches a fourth preset value. A control chip is arranged in the controller 9, the temperature detection device 6 and the wind pressure detection device 8 are both connected to the controller 9, and the controller 9 is connected to the motor 721.

[0029] When the temperature detection device 6 detects that the temperature reaches the first preset value or the wind pressure detection device 8 detects that the wind pressure is lower than the second preset value, the speed of the motor 721 is increased, so as to draw more air into the combustion chamber 3 to maintain the full and stable combustion of the flame, and avoid the flame from being elongated and damaging the heat exchanger 4. When the speed of the motor 721 reaches the third preset value and the temperature reaches the fourth preset value, the operation of the burner 2 is stopped, so as to keep the temperature in the combustion chamber 3 within a normal range. Among them, the fourth preset value is greater than the first preset value, and the third preset value can be the highest gear speed of the motor 721. When the air extraction device extracts air, the air entering from the first air inlet holes 35 will take away part of the heat at the connection structure 33, thus reducing the problem of heat accumulation at the connection, and at the same time, the air flows in the gap 34 to form air cooling, cooling the surface of the combustion chamber 3, and further improving the service life and reliability of the water heater.

[0030] The burner 2 is sealed to the combustion chamber 3 by threaded fasteners and sealing rings, the upper end of the heat exchanger 5 is sealed to the smoke hood 71 by threaded fasteners and sealing rings, and the lower end of the heat exchanger 5 is sealed to the combustion chamber 3 by threaded fasteners and sealing rings, thereby reducing wind noise.

[0031] In some embodiments, the temperature detection device 6 may be a temperature controller or a temperature sensor, and may also be other devices for detecting temperature.

[0032] In some embodiments, the wind pressure detection device 8 can be a wind pressure switch or a wind pressure sensor, and can also be other devices for detecting wind pressure. The wind pressure switch is connected to the inner cavity of the fan through a pipeline.

[0033] In some embodiments, the connection structure 33 includes a mounting hole 331 provided on the outer shell 32 and the inner shell 31 and a connection component that cooperates with the mounting hole 331 to connect the outer shell 32 and the inner shell 31. The connection component includes a bolt 332 and a nut 333. The inner shell 31 and the outer shell 32 are provided with an embedding groove 334 for the nut 333 of the bolt 332 to be embedded at the position corresponding to the mounting hole 331. The first air inlet 35 is provided next to the embedding groove 334. The embedding groove 334 can reduce the installation space of the inner shell 31 and the outer shell 32, making the structure more compact. The embedding groove 334 is pressed inward, and at the same time, the contact area with the wind is increased, thereby accelerating heat dissipation. Specifically, the first air inlet 35 can be arranged around the embedding groove 334.

[0034] In some embodiments, a guide slope 312 is provided on the inner side of the inner shell 31 at a position corresponding to the first air inlet channel 311 for allowing the wind to flow upward along the inner wall of the inner shell 31. The guide slope 312 allows the wind to flow upward along the inner wall of the inner shell 31 to form a wind-cooled barrier, thereby further cooling the surface of the combustion chamber 3 and reducing the heat dissipation to the inner shell 31 and the outer shell 32.

[0035] In some embodiments, the outer shell 32 is further provided with a plurality of second air inlet channels 321 for introducing air into the gap 34. The outer shell 32 is provided with a plurality of second air inlet channels 321 on each side wall, the inner shell 31 is provided with a first air inlet channel 311 on each side wall, the upper, middle and lower parts of the outer shell 32 are provided with second air inlet channels 321, and the upper, middle and lower parts of the inner shell 31 are provided with first air inlet channels 311, so as to dissipate heat from each surface of the combustion chamber 3 and the upper, middle and lower parts of each surface, so that the temperature of each surface of the combustion chamber 3 is balanced.

Claims

1. A gas water heater, characterized in that: The gas water heater comprises a shell (1), and a burner (2), a combustion chamber (3), a heat exchanger (4) and an exhaust device arranged in the shell (1) from bottom to top; the gas water heater also comprises a water pipe (5) flowing through the heat exchanger (4); the combustion chamber (3) comprises an inner shell (31) with upper and lower openings and an outer shell (32) sleeved on the outer side of the inner shell (31); a connecting structure (33) for connecting the inner shell (31) and the outer shell (32) is provided between the inner shell (31) and the outer shell (32); a gap (34) is also provided between the inner shell (31) and the outer shell (32); a plurality of first air inlet holes (35) for allowing outside air to flow into the gap (34); the first air inlet holes (35) are arranged next to the connecting structure (33); the inner shell (31) is provided with a plurality of first air inlet holes (35) for allowing outside air to flow into the gap (34); the first air inlet holes (35) are arranged next to the connecting structure (33); A first air inlet channel (311) is provided in the inner cavity of the inner shell (31); the fire outlet of the burner (2) is connected to the lower opening of the combustion chamber (3); the output end of the water pipe (5) is provided with a temperature detection device (6) for detecting the temperature; the exhaust device comprises a smoke collecting hood (71) and a fan assembly (72); the fan assembly (72) comprises a motor (721); the motor (721) is a multi-speed motor; a wind pressure detection device (8) for detecting the wind pressure in the fan assembly (72) is provided in the shell (1); and a controller (9) is also provided in the shell (1) for increasing the speed of the motor (721) when it is detected that the temperature reaches a first preset value or the wind pressure is lower than a second preset value, and stopping the operation of the burner (2) when the speed of the motor (721) reaches a third preset value and the temperature reaches a fourth preset value.

2. A gas water heater according to claim 1, characterized in that: The temperature detection device (6) comprises a temperature controller or a temperature sensor.

3. A gas water heater according to claim 1 or 2, characterized in that: The wind pressure detection device (8) comprises a wind pressure switch or a wind pressure sensor.

4. A gas water heater according to claim 3, characterized in that: The connection structure (33) comprises a mounting hole (331) provided on the outer shell (32) and the inner shell (31), and a connection component that cooperates with the mounting hole (331) to connect the outer shell (32) and the inner shell (31).

5. A gas water heater according to claim 4, characterized in that: The connection assembly comprises a bolt (332) and a nut (333), and positions on the inner shell (31) and the outer shell (32) corresponding to the mounting hole (331) are provided with an embedding groove (334) for embedding a nut (333) of the bolt (332) or a nut (333).

6. A gas water heater according to claim 5, characterized in that: The first air inlet hole (35) is arranged beside the embedding groove (334).

7. A gas water heater according to claim 3, characterized in that: A guide slope (312) for allowing wind to flow upward along the inner wall of the inner shell (31) is provided at a position on the inner side of the inner shell (31) corresponding to the first air inlet channel (311).

8. A gas water heater according to claim 3, characterized in that: The housing (32) is also provided with a plurality of second air inlet channels (321) for letting air into the gap (34).

9. A gas water heater according to claim 8, characterized in that: A plurality of second air inlet channels (321) are provided on each side wall of the outer shell (32), and a first air inlet channel (311) is provided on each side wall of the inner shell (31).

10. A gas water heater according to claim 1, characterized in that: The burner (2) is sealedly connected to the combustion chamber (3), the upper end of the heat exchanger (4) is sealedly connected to the air inlet end of the smoke collecting hood (71), and the lower end of the heat exchanger (4) is sealedly connected to the combustion chamber (3).

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