Gas water heater and control method thereof

Abstract

The invention relates to the technical field of gas water heaters, and discloses a gas water heater and a control method thereof. The main board is used for supplying power to the electric components; the power supply is used for supplying power to the mainboard; the smoke exhaust pipe comprises an inner-layer smoke pipe and an outer-layer smoke pipe, the inner-layer smoke pipe comprises a thermoelectric power generation sheet, the thermoelectric power generation sheet is connected with a power supply, the inner side of the inner-layer smoke pipe forms a smoke exhaust channel, the smoke exhaust channel is communicated with the whole machine shell, the outer-layer smoke pipe surrounds the inner-layer smoke pipe, an airflow channel is formed between the outer-layer smoke pipe and the inner-layer smoke pipe, and the outer-layer smoke pipe is provided with an air inlet hole; the gas water heater does not need to be externally connected with a mains supply, during power failure, electricity stored by the power source can be supplied to the main board, the main board supplies power to all electric components, the gas water heater can be normally ignited for use, and in the normal use process of the gas water heater, the gas water heater is not prone to damage, and the service life of the gas water heater is prolonged. And the power generated by the thermoelectric power generation sheet continuously charges the power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of gas water heaters, and in particular to a gas water heater and a control method thereof. Background Art

[0002] Gas water heaters have entered thousands of households as a major hot water tool. The principle of gas water heaters is to heat water through gas. Although gas is the main energy source, in related technologies, the power supply of gas water heaters is mainly connected to the mains to supply power to the power-consuming components, such as: mainboard, proportional valve, gas distribution rod, fan, etc. This results in the water heater being unable to be used normally during a power outage. Although it can produce water, it cannot be used for heating. Summary of the invention

[0003] In view of this, the present invention provides a gas water heater and a control method thereof to solve the problem in the related art that the gas water heater cannot be used normally after a power outage.

[0004] In a first aspect, the present invention provides a gas water heater, comprising:

[0005] The whole machine housing;

[0006] Mainboard, used to supply power to electrical components;

[0007] A power supply, used to supply power to the mainboard;

[0008] The smoke exhaust pipe comprises an inner smoke pipe and an outer smoke pipe, the inner smoke pipe comprises a temperature difference power generation sheet, the temperature difference power generation sheet is connected to the power supply, the inner side of the inner smoke pipe constitutes a smoke exhaust channel, the smoke exhaust channel is connected to the whole machine housing, the outer smoke pipe surrounds the inner smoke pipe, an air flow channel is formed between the outer smoke pipe and the inner smoke pipe, the outer smoke pipe is provided with an air inlet hole, and the air inlet hole is connected to the air flow channel.

[0009] Beneficial effect: the smoke exhaust channel is connected with the whole machine housing, and the high-temperature smoke generated by the combustion of the burner is discharged outward through the smoke exhaust channel in the inner smoke pipe. Since the high-temperature smoke flows through the inner side of the inner smoke pipe, the temperature of the inner smoke pipe is relatively high. By arranging the outer smoke pipe on the outer side of the inner smoke pipe, the outer smoke pipe is provided with an air inlet, and an air flow channel is formed between the outer smoke pipe and the inner smoke pipe, the external cold air can enter the air flow channel from the air inlet and flow along the air flow channel, so the outer temperature of the inner smoke pipe is relatively low. The inner smoke pipe includes a thermoelectric power generation sheet, and the temperature difference between the inner and outer sides of the thermoelectric power generation sheet is large, so that thermoelectric power generation can be realized. The electricity generated by the thermoelectric power generation sheet can charge the power supply, the power supply supplies power to the main board, and the main board supplies power to various electrical components. Therefore, the gas water heater does not need to be connected to the mains electricity. When the power is off, the electricity stored in the power supply can supply power to the main board, and the main board supplies power to various electrical components. The gas water heater can be ignited and used normally, and during the normal use of the gas water heater, the electricity generated by the thermoelectric power generation sheet continuously charges the power supply.

[0010] In an optional embodiment, the thermoelectric power generation sheet is cylindrical.

[0011] Beneficial effect: Since the thermoelectric power generation sheet is cylindrical and constitutes a part of the inner smoke pipe, the high-temperature flue gas generated by the burner flows through the inner side of the thermoelectric power generation sheet. The high-temperature flue gas generated by the burner can fully contact the inner side of the thermoelectric power generation sheet, and the contact area is large, which can improve the power generation efficiency.

[0012] In an optional embodiment, the inner smoke pipe further includes a first cylindrical portion and a second cylindrical portion connected to both ends of the temperature difference power generation sheet, the first cylindrical portion is connected to the whole machine casing, and the second cylindrical portion is provided with a smoke exhaust hole.

[0013] Beneficial effect: By connecting the first cylindrical part and the second cylindrical part at both ends of the temperature difference power generation sheet, it is convenient to connect with the whole machine housing and also convenient to process the smoke exhaust hole in the second cylindrical part.

[0014] In an optional embodiment, the outer smoke pipe is connected to the first cylindrical portion and / or the second cylindrical portion via a bracket.

[0015] Beneficial effects: the outer smoke pipe is connected to the first cylindrical portion and / or the second cylindrical portion via a bracket, and the bracket can support the outer smoke pipe and maintain the shape of the outer smoke pipe.

[0016] In an optional embodiment, a guide vane is provided in the air flow channel, and the guide vane is used to guide the air flow entering from the air inlet to the temperature difference power generation sheet.

[0017] Beneficial effect: By arranging a guide vane in the air flow channel, the guide vane can guide the air flow entering from the air inlet to the thermoelectric power generation sheet, thereby lowering the temperature outside the thermoelectric power generation sheet and improving the power generation efficiency.

[0018] In an optional implementation, the guide vane is arranged at an angle.

[0019] Beneficial effect: By setting the guide plate at an angle, on the one hand, the airflow entering from the air inlet can be directed to the temperature difference power generation plate, and on the other hand, the airflow can be guided to flow along the airflow channel to ensure the flow direction of the airflow.

[0020] In an optional embodiment, a plurality of guide plates are provided at intervals along the length direction of the outer smoke tube, the interval between two adjacent guide plates is L1, the length of the outer smoke tube is L, and L1≥L / 11.

[0021] Beneficial effect: If the distance between two adjacent guide plates is too short, the turbulence failure will be caused. Therefore, by making the distance between two adjacent guide plates greater than or equal to 1 / 11 of the length of the outer smoke pipe, the turbulence failure can be avoided.

[0022] In an optional implementation, the height of the guide plate is H, the gap between the outer layer smoke tube and the inner layer smoke tube is D, and H≤D / 3.

[0023] Beneficial effect: If the height of the guide plate is too high, the cross-sectional area for air to pass through will be too small, resulting in insufficient air supply. Therefore, by making the height of the guide plate less than or equal to 1 / 3 of the gap between the outer smoke tube and the inner smoke tube, it can play a guiding role while allowing air to pass smoothly.

[0024] In an optional embodiment, the first end of the outer smoke tube is sealed and connected to the inner smoke tube, the second end of the outer smoke tube is provided with an opening, and the airflow channel is connected to the whole machine housing through the opening.

[0025] Beneficial effect: Since the first end of the outer smoke tube is closed and connected to the inner smoke tube, when external cold air enters the air flow channel from the air inlet hole, it can only flow toward the second end of the outer smoke tube, enter the whole machine casing through the opening at the second end of the outer smoke tube, and then enter the inner smoke tube together with the high-temperature smoke.

[0026] In an optional implementation, the thermoelectric power generation sheet is made of non-metallic material.

[0027] Beneficial effect: Since the thermoelectric power generation sheet is made of non-metallic material, the heat transfer from the inside to the outside of the thermoelectric power generation sheet can be reduced, thereby ensuring the power generation efficiency.

[0028] In an optional implementation, a transformer, a voltage stabilizer, a rectifier, and a capacitor are connected in series between the temperature difference power generation sheet and the power supply.

[0029] Beneficial effect: By connecting a transformer, a voltage stabilizer, a rectifier and a capacitor in series between the temperature difference power generation sheet and the power supply, stable charging of the power supply can be ensured.

[0030] In an optional embodiment, the mainboard is provided with a power interface, and the power interface is suitable for connecting an emergency power supply device.

[0031] Beneficial effect: By setting a power interface on the mainboard, it is convenient to provide emergency power supply to users during power outage.

[0032] In a second aspect, the present invention further provides a control method for a gas water heater, which is applied to the gas water heater, and the control method comprises:

[0033] Get the power of the power source;

[0034] If the power level is lower than the first preset power level, the gas water heater is controlled to ignite.

[0035] Beneficial effect: If the power level of the power supply is lower than the first preset power level, the gas water heater is controlled to ignite, and the high-temperature flue gas generated by the burner is discharged outward through the smoke exhaust channel in the inner smoke tube. Since the high-temperature flue gas flows through the inner side of the inner smoke tube, the temperature of the inner smoke tube is relatively high. By arranging an outer smoke tube on the outer side of the inner smoke tube, the outer smoke tube is provided with an air inlet hole, and an air flow channel is formed between the outer smoke tube and the inner smoke tube, external cold air can enter the air flow channel from the air inlet hole and flow along the air flow channel. Therefore, the temperature of the outer side of the inner smoke tube is relatively low. The inner smoke tube includes a thermoelectric power generation sheet, and the temperature difference between the inner and outer sides of the thermoelectric power generation sheet is large, thereby realizing thermoelectric power generation. The power generated by the thermoelectric power generation sheet can charge the power supply to prevent the gas water heater from failing to work normally due to the low power level of the power supply.

[0036] In an optional implementation, if the power level is lower than the first preset power level, the control method further includes:

[0037] The burner is controlled to burn at minimum firepower until the power reaches a second preset power.

[0038] Beneficial effect: If the power is lower than the first preset power, the burner is controlled to burn at the minimum firepower until the power reaches the second preset power, which can save more energy.

[0039] In an optional implementation, if the power level is lower than the first preset power level, the control method further includes:

[0040] Control the fan to operate at the lowest power.

[0041] Beneficial effect: If the power is lower than the first preset power, the fan works at the lowest power to ensure that the burner can burn normally, which can reduce the power consumption of the fan and save more electricity.

[0042] In an optional implementation, the control method further includes:

[0043] If the power level is lower than the first preset power level and the gas water heater fails to ignite successfully, the control main board stops supplying power to electrical components except the gas proportional valve and the ignition needle, and controls the ignition of the gas water heater at preset time intervals until the power level is lower than the third preset power level or the gas water heater ignites successfully.

[0044] Beneficial effect: If the power is lower than the first preset power, there may be a gas outage, which may cause the gas water heater to fail to ignite successfully. At this time, the control mainboard stops supplying power to the electrical components except the gas proportional valve and the ignition needle, reducing the power consumption of the power supply, and controls the ignition of the gas water heater at every preset time interval to ensure timely charging of the power supply. If the power is lower than the third preset power and the ignition is still not successful, the ignition will not continue, preventing excessive power consumption from affecting the life of the power supply.

[0045] In an optional implementation, the control method further includes:

[0046] If the power level is lower than the third preset power level and the gas water heater fails to ignite successfully, the control mainboard stops supplying power to all electrical components.

[0047] Beneficial effect: If the power level is lower than the third preset power level and the ignition fails, the control mainboard stops supplying power to all power-consuming components to prevent excessive power consumption and shortening the life of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 This is a schematic structural diagram of a smoke exhaust pipe of a gas water heater according to an embodiment of the present invention;

[0050] Figure 2 for Figure 1 A cross-sectional view of the exhaust pipe shown;

[0051] Figure 3 for Figure 1 A side view of the exhaust pipe shown in ;

[0052] Figure 4 for Figure 1 Schematic diagram of the middle and inner smoke pipes;

[0053] Figure 5 for Figure 1 Schematic diagram of the middle and outer smoke pipes;

[0054] Figure 6 for Figure 2 Schematic diagram of the middle bracket;

[0055] Figure 7 A schematic diagram of a gas water heater according to an embodiment of the present invention;

[0056] Figure 8 The present invention is a flow chart of a method for controlling a gas water heater according to an embodiment of the present invention.

[0057] Description of reference numerals:

[0058] 1. Main board; 2. Power supply; 3. Inner smoke pipe; 301. Temperature difference power generation sheet; 302. First cylindrical part; 303. Second cylindrical part; 304. Smoke exhaust hole; 4. Outer smoke pipe; 401. Air inlet hole; 5. Smoke exhaust channel; 6. Air flow channel; 7. Bracket; 8. Guide vane; 9. Burner; 10. Gas proportional valve; 11. Fan. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0060] Gas water heaters have entered thousands of households as a major hot water tool. The principle of gas water heaters is to heat water through gas. Although gas is the main energy source, in related technologies, the power supply of gas water heaters is mainly connected to the mains to supply power to the power-consuming components, such as: mainboard, proportional valve, gas distribution rod, fan, etc. This results in the water heater being unable to be used normally during a power outage. Although it can produce water, it cannot be used for heating.

[0061] Combine the following Figures 1 to 8 , describing an embodiment of the present invention.

[0062] According to an embodiment of the present invention, on the one hand, a gas water heater is provided, including a whole housing, a mainboard 1, a power supply 2 and a smoke exhaust pipe.

[0063] Among them, the main board 1 is used to supply power to electrical components; the power supply 2 is used to supply power to the main board 1; the smoke exhaust pipe includes an inner smoke pipe 3 and an outer smoke pipe 4, the inner smoke pipe 3 includes a temperature difference power generation sheet 301, the temperature difference power generation sheet 301 is connected to the power supply 2, the inner side of the inner smoke pipe 3 constitutes a smoke exhaust channel 5, the smoke exhaust channel 5 is connected to the whole machine casing, the outer smoke pipe 4 surrounds the inner smoke pipe 3, an air flow channel 6 is formed between the outer smoke pipe 4 and the inner smoke pipe 3, the outer smoke pipe is provided with an air inlet hole 401, and the air inlet hole 401 is connected to the air flow channel 6.

[0064] In this embodiment, the smoke exhaust channel 5 is connected to the whole machine housing, and the high-temperature smoke generated by the burner 9 is discharged to the outside through the smoke exhaust channel 5 in the inner smoke tube 3. Since the high-temperature smoke flows through the inner side of the inner smoke tube 3, the temperature of the inner smoke tube 3 is relatively high. By arranging an outer smoke tube 4 on the outer side of the inner smoke tube 3, the outer smoke tube 4 is provided with an air inlet 401, and an air flow channel 6 is formed between the outer smoke tube 4 and the inner smoke tube 3, external cold air can enter the air flow channel 6 from the air inlet 401 and flow along the air flow channel 6, so the outer side temperature of the inner smoke tube 3 is relatively low. The inner smoke tube 3 includes a temperature difference power generation sheet 301, and the temperature difference between the inner and outer sides of the temperature difference power generation sheet 301 is large, so that temperature difference power generation can be realized. The electricity generated by the temperature difference power generation sheet 301 can charge the power supply 2, the power supply 2 supplies power to the main board 1, and the main board 1 supplies power to various electrical components. Therefore, the gas water heater does not need to be connected to the mains electricity. When there is a power outage, the electricity stored in the power supply 2 can supply power to the mainboard 1. The mainboard 1 supplies power to various electrical components, and the gas water heater can be ignited and used normally. During the normal use of the gas water heater, the electricity generated by the thermoelectric power generation sheet 301 continuously charges the power supply 2.

[0065] It should be noted that after the gas water heater is produced, the power supply 2 contains a certain amount of electricity, which can be used by the user to start the gas water heater. When the user turns on the hot water, the burner 9 burns, and the high-temperature flue gas generated by the combustion flows through the inner side of the thermoelectric power generation sheet 301. The thermoelectric power generation sheet 301 generates electricity to charge the power supply 2.

[0066] It should be noted that since the current generated by the thermoelectric power generation sheet 301 is greatly affected by the size of the fire power, the current it generates cannot be stably used to power the mainboard 1. Therefore, the power supply 2 supplies power to the mainboard 1, and the mainboard 1 supplies power to various electrical components. The current generated by the thermoelectric power generation sheet 301 is transmitted to the power supply 2 in real time for charging.

[0067] In one embodiment, the thermoelectric power generation sheet 301 is cylindrical.

[0068] In this embodiment, since the thermoelectric power generation sheet 301 is cylindrical, the thermoelectric power generation sheet 301 constitutes a part of the inner smoke pipe 3, and the high-temperature flue gas generated by the burner 9 flows through the inner side of the thermoelectric power generation sheet 301. The high-temperature flue gas generated by the burner 9 can fully contact the inner side of the thermoelectric power generation sheet 301, and the contact area is large, which can improve the power generation efficiency.

[0069] In an embodiment not shown in the figure, the thermoelectric power generation sheet 301 may be an arc-shaped sheet structure.

[0070] In one embodiment, the inner smoke pipe 3 further includes a first cylindrical portion 302 and a second cylindrical portion 303 connected to both ends of the thermoelectric power generation sheet 301 . The first cylindrical portion 302 is connected to the entire machine housing, and the second cylindrical portion 303 is provided with a smoke exhaust hole 304 .

[0071] In this embodiment, by connecting the first cylindrical portion 302 and the second cylindrical portion 303 at both ends of the temperature difference power generation sheet 301 , it is convenient to connect with the entire machine housing and also convenient to process the smoke exhaust hole 304 in the second cylindrical portion 303 .

[0072] Specifically in one embodiment, the first cylindrical portion 302 and the second cylindrical portion 303 are both made of stainless steel, which facilitates processing of the smoke exhaust hole 304 on the second cylindrical portion 303 .

[0073] Specifically in one embodiment, Figure 4 As shown, the smoke exhaust hole 304 is arranged on the peripheral wall of the second cylindrical portion 303 .

[0074] In one embodiment, the outer smoke tube 4 is connected to the first cylindrical portion 302 and / or the second cylindrical portion 303 via a bracket 7 .

[0075] In this embodiment, the outer smoke tube 4 is connected to the first cylindrical portion 302 and / or the second cylindrical portion 303 via a bracket 7 , and the bracket 7 can support the outer smoke tube 4 to maintain the shape of the outer smoke tube 4 .

[0076] Specifically in one embodiment, the outer smoke pipe 4 is connected to the first cylindrical portion 302 via a bracket 7 , and the outer smoke pipe 4 is connected to the second cylindrical portion 303 via a bracket 7 .

[0077] It should be noted that the bracket 7 is made of sheet metal and has a hollow structure, which can support the outer smoke pipe 4 and the inner smoke pipe 3 and has a ventilation effect.

[0078] In one embodiment, a guide vane 8 is provided in the air flow channel 6 , and the guide vane 8 is used to guide the air flow entering from the air inlet 401 to the thermoelectric power generation sheet 301 .

[0079] In this embodiment, by setting a guide plate 8 in the air flow channel 6, the guide plate 8 can guide the airflow entering from the air inlet 401 to the thermoelectric power generation sheet 301, so that the temperature outside the thermoelectric power generation sheet 301 can be lowered, thereby improving the power generation efficiency.

[0080] In one embodiment, the guide vane 8 is arranged at an angle.

[0081] In this embodiment, by tilting the guide plate 8, the airflow entering from the air inlet 401 can be directed to the temperature difference power generation plate 301 on the one hand, and the airflow can be guided to flow along the airflow channel 6 on the other hand to ensure the flow direction of the airflow.

[0082] In one embodiment, a plurality of guide plates 8 are provided at intervals along the length direction of the outer smoke tube 4 , the interval between two adjacent guide plates 8 is L1 , the length of the outer smoke tube 4 is L, and L1 ≥ L / 11.

[0083] In this embodiment, if the distance between two adjacent guide vanes 8 is too short, turbulence failure may occur. Therefore, by making the distance between two adjacent guide vanes 8 greater than or equal to 1 / 11 of the length of the outer smoke tube 4, turbulence failure may be avoided.

[0084] Specifically in one embodiment, the distance between two adjacent guide plates 8 is equal to 1 / 11 of the length of the outer smoke tube 4 .

[0085] Specifically in one embodiment, the distance between two adjacent guide plates 8 is greater than 1 / 11 of the length of the outer smoke tube 4 , for example, the distance between two adjacent guide plates 8 is equal to 1 / 10 of the length of the outer smoke tube 4 .

[0086] In one embodiment, the height of the guide plate 8 is H, the gap between the outer smoke tube 4 and the inner smoke tube 3 is D, and H≤D / 3.

[0087] In this embodiment, if the height of the guide plate 8 is too high, the cross-sectional area for air to pass through will be too small, resulting in insufficient air supply. Therefore, by making the height of the guide plate 8 less than or equal to 1 / 3 of the gap between the outer smoke tube 4 and the inner smoke tube 3, the air can pass smoothly while playing a guiding role.

[0088] Specifically in one embodiment, the height of the guide plate 8 is just equal to 1 / 3 of the gap between the outer layer smoke tube 4 and the inner layer smoke tube 3 .

[0089] Specifically in one embodiment, the height of the guide plate 8 is less than 1 / 3 of the gap between the outer layer smoke tube 4 and the inner layer smoke tube 3 , for example, 1 / 4 of the gap between the outer layer smoke tube 4 and the inner layer smoke tube 3 .

[0090] It should be noted that the height of the guide vane 8 refers to the dimension along the radial direction of the outer smoke tube 4 .

[0091] In one embodiment, the first end of the outer smoke tube 4 is sealed and connected to the inner smoke tube 3, and the second end of the outer smoke tube 4 is provided with an opening, and the airflow channel 6 is connected to the entire machine housing through the opening.

[0092] In this embodiment, since the first end of the outer smoke tube 4 is closed and connected to the inner smoke tube 3, when the external cold air enters the air flow channel 6 from the air inlet hole 401, it can only flow in the direction of the second end of the outer smoke tube 4, enter the whole machine casing through the opening at the second end of the outer smoke tube 4, and then enter the inner smoke tube 3 together with the high-temperature flue gas.

[0093] It should be noted that the gas water heater of this embodiment has a fan 11 in the whole machine shell. The fan 11 provides power to draw out the smoke and discharge it through the inner smoke pipe 3, so that negative pressure is generated in the whole machine, so that external cold air can enter through the air inlet 401, flow to the inside of the whole machine shell through the air flow channel 6, participate in combustion, generate smoke, and be discharged to the outside through the inner smoke pipe 3.

[0094] In one embodiment, the thermoelectric power generation sheet 301 is made of non-metallic material.

[0095] In this embodiment, since the thermoelectric power generation sheet 301 is made of non-metallic material, the heat transfer from the inside to the outside of the thermoelectric power generation sheet 301 can be reduced, thereby ensuring the power generation efficiency.

[0096] Specifically in one embodiment, the thermoelectric power generation sheet 301 can be made of non-metallic materials such as plastic or rubber.

[0097] In one embodiment, a transformer, a voltage stabilizer, a rectifier, and a capacitor are connected in series between the thermoelectric power generation sheet 301 and the power source 2 .

[0098] In this embodiment, by connecting a transformer, a voltage stabilizer, a rectifier, and a capacitor in series between the temperature difference power generation sheet 301 and the power source 2, stable charging of the power source 2 can be ensured.

[0099] In one embodiment, the mainboard 1 is provided with a power interface, and the power interface is suitable for connecting an emergency power supply device.

[0100] In this embodiment, by providing a power interface on the mainboard 1, emergency power supply to the user is facilitated during a power outage.

[0101] According to an embodiment of the present invention, on the other hand, a control method for a gas water heater is provided, which is applied to the gas water heater provided in the above embodiment, such as Figure 8 As shown, the control method includes:

[0102] Get the power of power supply 2;

[0103] If the power level is lower than the first preset power level, the gas water heater is controlled to ignite.

[0104] In this embodiment, if the power level of the power source 2 is lower than the first preset power level, the gas water heater is controlled to ignite, and the high-temperature flue gas generated by the burner 9 is discharged outward through the exhaust channel 5 in the inner smoke tube 3. Since the high-temperature flue gas flows through the inner side of the inner smoke tube 3, the temperature of the inner smoke tube 3 is relatively high. An outer smoke tube 4 is arranged on the outer side of the inner smoke tube 3, and the outer smoke tube 4 is provided with an air inlet 401. An air flow channel 6 is formed between the outer smoke tube 4 and the inner smoke tube 3. External cold air can enter the air flow channel 6 from the air inlet 401 and flow along the air flow channel 6. Therefore, the temperature of the outer side of the inner smoke tube 3 is relatively low. The inner smoke tube 3 includes a temperature difference power generation sheet 301. The temperature difference between the inner and outer sides of the temperature difference power generation sheet 301 is large, so that temperature difference power generation can be realized. The power generated by the temperature difference power generation sheet 301 can charge the power source 2 to prevent the gas water heater from failing to work normally due to the low power level of the power source 2.

[0105] Specifically in one embodiment, the first preset power level is 20% power level.

[0106] Specifically in one embodiment, the electrical components of the gas water heater include a gas proportional valve 10 and an ignition needle, and controlling the ignition of the gas water heater specifically includes controlling the gas proportional valve 10 to open and supplying power to the ignition needle.

[0107] In one embodiment, if the power level is lower than a first preset power level, the control method further includes:

[0108] The burner 9 is controlled to burn at the minimum firepower until the power reaches the second preset power.

[0109] In this embodiment, if the power level is lower than the first preset power level, the burner 9 is controlled to burn at the minimum firepower until the power level reaches the second preset power level, which can save more energy.

[0110] Specifically in one embodiment, the second preset power level may be 80%.

[0111] In one embodiment, if the power level is lower than a first preset power level, the control method further includes:

[0112] The fan 11 is controlled to operate at the lowest power.

[0113] In this embodiment, if the power is lower than the first preset power, the fan 11 operates at the lowest power to ensure that the burner 9 can burn normally, which can reduce the power consumption of the power supply 2 by the fan 11 and save more electricity.

[0114] In one embodiment, the control method further includes:

[0115] If the power level is lower than the first preset power level and the gas water heater fails to ignite successfully, the control motherboard 1 stops supplying power to electrical components except the gas proportional valve 10 and the ignition needle, and controls the ignition of the gas water heater at preset time intervals until the power level is lower than the third preset power level or the gas water heater ignites successfully.

[0116] In this embodiment, if the power is lower than the first preset power, there may be a gas outage, resulting in the failure of the gas water heater to ignite successfully. At this time, the control mainboard 1 stops supplying power to the electrical components except the gas proportional valve 10 and the ignition needle, reducing the power consumption of the power source 2, and controls the gas water heater to ignite at every preset time interval to ensure timely charging of the power source 2. If the power is lower than the third preset power and the ignition is still not successful, the ignition will not continue, to prevent the power source 2 from being over-consumed and affecting its life.

[0117] Specifically in one embodiment, the third preset power level is 5% power level.

[0118] In one embodiment, the control method further includes:

[0119] If the power level is lower than the third preset power level and the gas water heater fails to ignite successfully, the control mainboard 1 stops supplying power to all electrical components.

[0120] In this embodiment, if the power level is lower than the third preset power level and the ignition fails, the control mainboard 1 stops supplying power to all power-consuming components to prevent the power supply 2 from being over-consumed and affecting its life.

[0121] The gas water heater provided in this embodiment will automatically pneumatically ignite the entire machine when the remaining power of the power source 2 is less than 20% (regardless of whether the user is using hot water), and the power of the fan 11 will be reduced to the minimum power to maintain combustion. It will continue to burn at the minimum firepower to generate high-temperature flue gas and bring in low-temperature air to generate electricity until the power of the power source 2 is restored to 80%.

[0122] When there is a gas outage at a user's home, the ignition cannot be started even if the power is less than 20%. Long-term gas outages and idle power supplies may cause the power to be less than 5%. When the power is less than 20%, if the ignition cannot be started, the mainboard 1 enters the energy-saving mode, closes all output power interfaces except the ignition, stops supplying power to electrical components except the gas proportional valve 10 and the ignition needle, and ignites once every 24 hours until the power is less than 5% or the ignition is started. If the power is less than 5% and the ignition is still not started to generate electricity, all output power interfaces are closed and the system enters the sleep mode, waiting for the user to actively start the ignition when using hot water.

[0123] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present application.

Claims

1. A gas water heater, characterized in that: include: The whole machine housing; A main board (1), used for supplying power to electrical components; A power supply (2) for supplying power to the mainboard (1); A smoke exhaust pipe comprises an inner smoke pipe (3) and an outer smoke pipe (4), wherein the inner smoke pipe (3) comprises a temperature difference power generation sheet (301), wherein the temperature difference power generation sheet (301) is connected to the power source (2), wherein the inner side of the inner smoke pipe (3) forms a smoke exhaust passage (5), wherein the smoke exhaust passage (5) is connected to the whole machine housing, wherein the outer smoke pipe (4) surrounds the inner smoke pipe (3), wherein an air flow passage (6) is formed between the outer smoke pipe (4) and the inner smoke pipe (3), wherein the outer smoke pipe (4) is provided with an air inlet hole (401), wherein the air inlet hole (401) is connected to the air flow passage (6).

2. The gas water heater according to claim 1, characterized in that: The temperature difference power generation sheet (301) is cylindrical.

3. The gas water heater according to claim 2, characterized in that: The inner smoke pipe (3) further comprises a first cylindrical portion (302) and a second cylindrical portion (303) connected to both ends of the temperature difference power generation sheet (301); the first cylindrical portion (302) is connected to the entire machine housing; and the second cylindrical portion (303) is provided with a smoke exhaust hole (304).

4. The gas water heater according to claim 3, characterized in that: The outer smoke tube (4) is connected to the first cylindrical portion (302) and / or the second cylindrical portion (303) via a bracket (7).

5. The gas water heater according to any one of claims 1 to 4, characterized in that: A guide plate (8) is provided in the air flow channel (6), and the guide plate (8) is used to guide the air flow entering from the air inlet (401) to the temperature difference power generation plate (301).

6. The gas water heater according to claim 5, characterized in that: The guide plate (8) is arranged obliquely.

7. The gas water heater according to claim 5, characterized in that: A plurality of guide plates (8) are arranged at intervals along the length direction of the outer smoke tube (4), the interval between two adjacent guide plates (8) is L1, the length of the outer smoke tube (4) is L, and L1≥L / 11.

8. The gas water heater according to claim 5, characterized in that: The height of the guide plate (8) is H, the gap between the outer layer smoke tube (4) and the inner layer smoke tube (3) is D, and H≤D / 3.

9. The gas water heater according to any one of claims 1 to 4 and 6 to 8, characterized in that: The first end of the outer smoke tube (4) is closedly connected to the inner smoke tube (3), and the second end of the outer smoke tube (4) is provided with an opening, and the airflow channel (6) is connected to the whole machine housing through the opening.

10. The gas water heater according to any one of claims 1 to 4 and 6 to 8, characterized in that: The temperature difference power generation sheet (301) is made of non-metallic material.

11. The gas water heater according to any one of claims 1 to 4 and 6 to 8, characterized in that: A transformer, a voltage stabilizer, a rectifier and a capacitor are connected in series between the temperature difference power generation sheet (301) and the power source (2).

12. The gas water heater according to any one of claims 1 to 4 and 6 to 8, characterized in that: The mainboard (1) is provided with a power supply interface, and the power supply interface is suitable for connecting an emergency power supply device.

13. A method for controlling a gas water heater, characterized in that: Applied to the gas water heater according to any one of claims 1 to 12, the control method comprises: Obtaining the power of the power source (2); If the power level is lower than the first preset power level, the gas water heater is controlled to ignite.

14. The control method of the gas water heater according to claim 13, characterized in that: If the power level is lower than the first preset power level, the control method further includes: The burner (9) is controlled to burn at a minimum firepower until the power reaches a second preset power.

15. The control method of the gas water heater according to claim 13, characterized in that: If the power level is lower than the first preset power level, the control method further includes: The fan (11) is controlled to operate at the lowest power.

16. The control method of the gas water heater according to claim 13, characterized in that: The control method further comprises: If the power level is lower than the first preset power level and the gas water heater fails to ignite successfully, the control main board (1) stops supplying power to electrical components other than the gas proportional valve (10) and the ignition needle, and controls the gas water heater to ignite at preset time intervals until the power level is lower than the third preset power level or the gas water heater ignites successfully.

17. The control method of the gas water heater according to claim 13, characterized in that: The control method further comprises: If the power level is lower than the third preset power level and the gas water heater fails to ignite successfully, the control mainboard (1) stops supplying power to all electrical components.

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