Water heater

Abstract

The application discloses a water heater and relates to the technical field of household appliances. The water heater comprises a smoke exhaust pipe, the smoke exhaust pipe comprises a smoke exhaust pipe body and a heating device, the heating device is used for heating the smoke exhaust pipe body so that the smoke exhaust pipe body returns to a non-frozen state, the smoke exhaust pipe further comprises a power generation device, a first driving device and a second driving device, the power generation device is electrically connected to the heating device, and the power generation device is used for supplying power to the heating device. When the water heater is in an open state, the first driving device is powered to enable the first driving device to drive the power generation device to open or close according to temperature change. When the water heater is in a closed state, the second driving device can change its own size according to temperature change to drive the power generation device to open or close. No matter whether the water heater is in the open state or the closed state, the smoke exhaust pipe can achieve good anti-freezing effect, avoid blockage of the smoke exhaust pipe, and save electric energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a water heater. BACKGROUND

[0002] When a gas water heater is used in winter in northern areas, water vapor in flue gas discharged from the flue gas discharge pipe is easily and quickly condensed and accumulated around the flue gas discharge opening due to the influence of external strong cold air, which causes the flue gas discharge pipe to freeze and block, and the gas water heater cannot be normally started, and safety hazards are caused. In the prior art, a heating device is arranged on the flue gas discharge pipe, and the flue gas discharge pipe is heated by the heating device to avoid the flue gas discharge pipe from being blocked and ensure normal use of the flue gas discharge pipe, but the heating device needs to consume additional electric energy, and the power consumption is large, and the heating device cannot play the anti-freezing effect in the power-off state. SUMMARY

[0003] The present application solves the technical problem that the anti-freezing of the flue gas discharge pipe of the water heater in the prior art needs to consume additional electric energy, the power consumption is large, and the anti-freezing effect is poor in the power-off state, and provides a water heater.

[0004] The present application solves the above technical problems by the following technical scheme:

[0005] The present application provides a water heater, which comprises a flue gas discharge pipe, the flue gas discharge pipe comprises a flue gas discharge pipe body and a heating device, the heating device is used for heating the flue gas discharge pipe body to restore the flue gas discharge pipe body to a non-frozen state, the flue gas discharge pipe further comprises a power generation device, a first driving device and a second driving device, the power generation device is electrically connected to the heating device, and the power generation device is used for supplying power to the heating device.

[0006] When the water heater is in an open state, the first driving device is energized to enable the first driving device to drive the power generation device to open or close according to temperature changes, and when the water heater is in a closed state, the second driving device can change its own volume according to temperature changes to drive the power generation device to open or close.

[0007] In the present scheme, the exhaust pipe of the water heater is provided with a heating device, a power generation device, a first driving device and a second driving device. The power generation device can supply power to the heating device, and the heating device can heat the exhaust pipe body so as to restore the exhaust pipe body to a non-frozen state. When the water heater is in an open state, the first driving device is powered to drive the power generation device to open or close according to temperature changes. Only the first driving device needs to be powered, and the first driving device can drive the power generation device according to temperature changes. The power generation device in turn provides power to the heating device, without the need to continuously power the heating device, thereby saving the energy consumption of the water heater. When the water heater is in a closed state, the second driving device can change its size according to temperature changes to drive the power generation device to open or close. The second driving device can open or close the power generation device without consuming power, and the power generation device in turn provides power to the heating device. Whether the water heater is in an open or closed state, the exhaust pipe can achieve good anti-freezing effect, avoid exhaust pipe blockage, and save power consumption.

[0008] Preferably, the exhaust pipe further comprises an inner cylinder, and the power generation device comprises an impeller, a rotating shaft, a rotor, a stator, a permanent magnet and a current collector ring.

[0009] The impeller is arranged outside the exhaust pipe body, the impeller is connected to the rotating shaft, the impeller can drive the rotating shaft to rotate along the circumference of the exhaust pipe body, the rotor is connected to the rotating shaft, the permanent magnet is arranged on the rotor, and the current collector ring is electrically connected to the heating device.

[0010] The stator is fixed to the inner cylinder, and the inner cylinder can move along the axis of the exhaust pipe body to make the permanent magnet and the stator located at the same axial position.

[0011] In the present scheme, the impeller is arranged outside the exhaust pipe body, so that the wind outside the exhaust pipe drives the impeller to rotate. The rotating shaft is connected to the impeller, and the impeller drives the rotating shaft to rotate along the circumference of the exhaust pipe body, thereby driving the rotor connected to the rotating shaft to rotate. The permanent magnet arranged on the rotor also rotates. The stator is fixed to the inner cylinder, and the inner cylinder can move along the exhaust pipe body to change the relative position of the permanent magnet and the stator in the axial direction.

[0012] When the positions of the permanent magnet and the stator in the axial direction are relatively staggered, the impeller is driven to rotate by the external wind force, and the stator does not produce magnetic induction line cutting or the cutting amount is very small, i.e. no electricity is generated or very little electricity is generated. When the permanent magnet and the stator are at the same axial position, the impeller is driven to rotate by the external wind force. At this time, the cutting of the magnetic induction line is strong, and gradually generates electricity. The electricity is stored in the current collector ring, and the current collector ring is electrically connected to the heating device, so that the current collector ring can provide power to the heating device. The heating device heats the exhaust pipe body to prevent the exhaust pipe body from freezing.

[0013] Preferably, the first driving device comprises an induction coil arranged inside the smoke pipe body and a first magnet fixed on the inner cylinder.

[0014] When the temperature is higher than the prevention temperature, the induction coil is not powered; when the temperature is lower than the prevention temperature, the induction coil is powered to generate a magnetic field, and the induction coil and the first magnet can attract each other to make the permanent magnet and the stator in the same axial position.

[0015] In this scheme, when the water heater is in the open state, the first driving device is powered to drive the power generation device to open or close according to the temperature change. The inside of the smoke pipe body is provided with an induction coil, and the first magnet is fixed on the inner cylinder. When the temperature is higher than the prevention temperature, the induction coil is not powered, and at this time the induction coil does not generate a magnetic field, and the induction coil will not be attracted to the first magnet. When the temperature is lower than the prevention temperature, the induction coil is powered at this time to generate a magnetic field, and the induction coil and the first magnet can attract each other, so that the permanent magnet and the stator are in the same axial position, and at this time the impeller is driven by the external wind to rotate the permanent magnet, thereby enabling the power generation device to power the heating device to heat the smoke pipe body and prevent the smoke pipe body from freezing.

[0016] Preferably, the second driving device comprises a sandwich layer arranged between the smoke pipe body and the inner cylinder, and the sandwich layer can change its volume according to the temperature change to make the inner cylinder move back and forth along the axial direction relative to the smoke pipe body.

[0017] In this scheme, when the water heater is in the closed state, the second driving device can change its own volume according to the temperature change to drive the power generation device to open or close. The second driving device comprises a sandwich layer arranged between the smoke pipe body and the inner cylinder, and the sandwich layer can change its volume according to the temperature change. When the volume of the sandwich layer is small, the permanent magnet and the stator are staggered in the axial position, and the stator hardly cuts the magnetic induction lines, so that the power generation device does not generate electric energy. When the volume of the sandwich layer increases, the sandwich layer can push the inner cylinder to move relative to the smoke pipe body, so that the permanent magnet and the stator are in the same axial position, and the impeller is driven by the external wind to rotate the permanent magnet, at this time the effect of cutting the magnetic induction lines is strong, thereby generating electric energy, and then the heating device is powered to heat.

[0018] Preferably, the sandwich layer comprises a skin film, the skin film is filled with a phase change fluid, one end of the skin film is fixed on the smoke pipe body, and the other end of the skin film abuts against the inner cylinder.

[0019] In the present scheme, the interlayer adopts a structure filled with phase change fluid in the skin film, the phase change fluid can change its volume according to temperature change, one end of the skin film is fixed to the smoke exhaust pipe body, the other end of the skin film abuts against the inner cylinder, so that when the volume of the phase change fluid changes, the phase change fluid can change the volume of the skin film, the skin film pushes the inner cylinder to move relative to the smoke exhaust pipe body.

[0020] Preferably, the phase change fluid is in a liquid state above the preset temperature, and in a solid state below the preset temperature, the volume of the solid state of the phase change fluid is greater than the volume of the liquid state of the phase change fluid, and the prevention temperature is higher than the preset temperature.

[0021] In the present scheme, when the water heater is in an open state, the water heater determines whether the power generation device is opened or not with the prevention temperature as a boundary, and when the water heater is in a closed state, the water heater determines whether the power generation device is opened or not with the preset temperature as a boundary. The prevention temperature is set to be higher than the preset temperature, when the water heater is in an open state, the power generation device is opened when the temperature is lower than the prevention temperature, and the smoke exhaust pipe body is heated to prevent the smoke exhaust pipe body from freezing, that is, the power generation device is started at a higher temperature, which effectively prevents the smoke exhaust pipe body from freezing and ensures that the smoke exhaust pipe body always remains in a non-frozen state, so that the water heater can operate normally. When the water heater is in a closed state, the smoke exhaust pipe body does not need to be kept in a non-frozen state at all times, and the opening temperature of the power generation device can be set lower, that is, the power generation device is opened when the temperature is lower than the preset temperature, so that the power generation device can be prevented from being frequently opened to cause structural wear and tear, thereby prolonging the service life.

[0022] Preferably, the interlayer further comprises a second magnet with a polarity opposite to that of the first magnet, the second magnet is fixed to the smoke exhaust pipe body, and the first magnet and the second magnet attract each other to make the permanent magnet and the stator stagger in the axial position.

[0023] In the present scheme, the first magnet is fixed to the inner cylinder, and the second magnet is fixed to the smoke exhaust pipe body, the first magnet and the second magnet can attract each other, thereby driving the inner cylinder and the smoke exhaust pipe body to change the relative position, so that the permanent magnet and the stator can stagger in the axial position, and the impeller no longer generates electric energy when rotating.

[0024] Preferably, the smoke exhaust pipe body has a plurality of smoke exhaust holes, the heating device comprises an electric heating element and a heat conducting sheet, the electric heating element is electrically connected to the power generation device, the heat conducting sheet is connected to the electric heating element, and the electric heating element and the heat conducting sheet are arranged around the smoke exhaust holes.

[0025] In the scheme, the smoke exhaust pipe body has a plurality of smoke exhaust holes, which will be frozen and blocked when the temperature is too low, causing the gas water heater to fail to start normally. The heating device includes an electric heating element and a heat conducting sheet, and the electric heating element is electrically connected to the power generation device. When the power generation device generates electricity, the electric heating element is powered on to start heating, and the heat energy is conducted to the periphery of the smoke exhaust hole through the heat conducting sheet connected to the electric heating element, so as to melt the ice blocking the smoke exhaust hole and ensure that the water heater can operate normally.

[0026] Preferably, the water heater further comprises a control device electrically connected to the first driving device, and the control device can control the opening or closing of the first driving device according to the temperature change.

[0027] In the scheme, when the water heater is in the open state, the power generation device is opened or closed by the first driving device, and the water heater is further provided with a control device electrically connected to the first driving device. The control device can control the opening or closing of the first driving device according to the temperature change, and further control the opening or closing of the power generation device. When the temperature reaches the set value, the control device opens the first driving device, and the first driving device drives the power generation device to open, so that the power generation device can supply power to the heating device.

[0028] Preferably, the water heater further comprises a temperature sensor electrically connected to the control device, and the temperature sensor is arranged on the water inlet of the water heater, and the temperature sensor is used to detect the water temperature of the water heater.

[0029] In the scheme, the water heater is further provided with a temperature sensor to detect the water temperature of the water heater. When the temperature sensor detects that the water temperature reaches the set value, the control device controls the opening of the first driving device according to the detection structure of the temperature sensor, the first driving device drives the power generation device to open, and further makes the power generation device capable of supplying power to the heating device.

[0030] The positive progress effect of the present application is that:

[0031] The smoke exhaust pipe of the water heater is provided with a heating device, a power generation device, a first driving device and a second driving device. The power generation device can supply power to the heating device. The heating device can heat the smoke exhaust pipe body, so as to restore the smoke exhaust pipe body to a non-frozen state. When the water heater is in an open state, the first driving device is powered to drive the power generation device to open or close according to temperature changes. Only the first driving device needs to be powered, and the first driving device can drive the power generation device to generate power according to temperature changes. The power generation device in turn provides power to the heating device, without the need to continuously supply power to the heating device, thereby saving the energy consumption of the water heater. When the water heater is in a closed state, the second driving device can change its own size to drive the power generation device to open or close according to temperature changes. The second driving device can open or close the power generation device without consuming power. The power generation device in turn provides power to the heating device. Whether the water heater is in an open or closed state, the smoke exhaust pipe can achieve good anti-freezing effect, avoid the blockage of the smoke exhaust pipe, and save the power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Structure schematic diagram of a water heater according to an embodiment of the present application.

[0033] Figure 2 Structure schematic diagram of a smoke exhaust pipe before freezing according to an embodiment of the present application.

[0034] Figure 3 Structure schematic diagram of a smoke exhaust pipe after freezing according to an embodiment of the present application.

[0035] Figure 4 Three-dimensional structure schematic diagram of an impeller according to an embodiment of the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] Smoke exhaust pipe 100

[0038] Smoke exhaust pipe body 110

[0039] Smoke exhaust hole 111

[0040] Inner cylinder 120

[0041] Heating device 200

[0042] Electric heating element 210

[0043] Thermal conductive sheet 220

[0044] Power generation device 300

[0045] Impeller 310

[0046] Rotating shaft 320

[0047] Rotor 330

[0048] Stator 340

[0049] Permanent magnet 350

[0050] 360° slip ring

[0051] Support component 370

[0052] First drive unit 400

[0053] Induction coil 410

[0054] First magnet 420

[0055] Second drive unit 500

[0056] Mezzanine 510

[0057] Skin 511

[0058] Phase change fluid 512

[0059] Second magnet 513

[0060] Control device 600

[0061] Temperature sensor 700

[0062] Axial x Detailed Implementation

[0063] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the following embodiments.

[0064] like Figure 1 As shown, this embodiment provides a water heater, which includes a flue pipe 100 and a flue pipe body 110 with multiple flue holes 111. When the temperature is too low, the flue holes 111 will freeze and become blocked, causing the gas water heater to fail to start normally.

[0065] like Figures 2-4 As shown, the exhaust pipe 100 includes an exhaust pipe body 110 and a heating device 200. The heating device 200 is used to heat the exhaust pipe body 110 to restore the exhaust pipe body 110 to a non-frozen state. The exhaust pipe 100 also includes a power generation device 300, a first driving device 400, and a second driving device 500. The power generation device 300 is electrically connected to the heating device 200 and is used to supply power to the heating device 200, thereby restoring the exhaust pipe body 110 to a non-frozen state.

[0066] When the water heater is in the open state, the first driving device 400 is powered to enable the first driving device 400 to drive the power generation device 300 to open or close according to the temperature change. Only the first driving device 400 is powered, the first driving device 400 can make the power generation device 300 generate power according to the temperature change, and the power generation device 300 in turn provides power for the heating device 200, without the need to continuously power the heating device 200, thereby saving the energy consumption of the water heater.

[0067] When the water heater is in the closed state, the second driving device 500 can change its size according to the temperature change to drive the power generation device 300 to open or close, and the second driving device 500 can open or close the power generation device 300 without consuming electricity, and the power generation device 300 in turn provides power for the heating device 200. Whether the water heater is in the open or closed state, the exhaust pipe 100 can achieve good anti-freezing effect, avoid the exhaust pipe 100 being blocked, and save the power consumption.

[0068] The exhaust pipe 100 further comprises an inner cylinder 120, and the power generation device 300 comprises an impeller 310, a rotating shaft 320, a rotor 330, a stator 340, a permanent magnet 350, a current collector ring 360 and a support 370. The impeller 310 is arranged outside the exhaust pipe body 110, the impeller 310 is connected to the rotating shaft 320, the impeller 310 can drive the rotating shaft 320 to rotate along the circumference of the exhaust pipe body 110, the rotor 330 is connected to the rotating shaft 320, the permanent magnet 350 is arranged on the rotor 330, the current collector ring 360 is electrically connected to the heating device 200, the support 370 is connected to the inside of the inner cylinder 120, and one end of the rotating shaft 320 is connected to the support 370, so that the rotating shaft 320 can be more firmly fixed to the inner cylinder 120. The stator 340 is fixed to the inner cylinder 120, and the inner cylinder 120 can move along the axial direction x of the exhaust pipe body 110 to make the permanent magnet 350 and the stator 340 located at the same axial direction x position, wherein the axial direction x refers to the direction of the central axis of the exhaust pipe 100, Figure 2 and Figure 3 The specific direction of the axial direction x is shown in the figure.

[0069] By arranging the impeller 310 outside the exhaust pipe body 110, the wind outside the exhaust pipe 100 drives the impeller 310 to rotate, the rotating shaft 320 is connected to the impeller 310, the impeller 310 drives the rotating shaft 320 to rotate along the circumference of the exhaust pipe body 110, and in turn drives the rotor 330 connected to the rotating shaft 320 to rotate, and the permanent magnet 350 arranged on the rotor 330 also rotates. The stator 340 is fixed to the inner cylinder 120, and the inner cylinder 120 can move along the exhaust pipe body 110 to change the relative position of the permanent magnet 350 and the stator 340 in the axial direction x.

[0070] When the position of the permanent magnet 350 and the stator 340 in the axial direction x is relatively staggered, the impeller 310 is driven by the external wind to rotate the permanent magnet 350, and the stator 340 does not produce a magnetic field or produces a very small amount of magnetic field, that is, does not produce electricity or produces very little electricity. When the permanent magnet 350 and the stator 340 are in the same axial position x, the impeller 310 is driven by the external wind to rotate the permanent magnet 350, and the cutting magnetic field is strong at this time, gradually generating electricity, which is stored in the collector ring 360. The collector ring 360 is electrically connected to the heating device 200, so that the collector ring 360 can provide power for the heating device 200, and the heating device 200 heats the smoke exhaust pipe body 110 to prevent the smoke exhaust pipe body 110 from freezing.

[0071] When the water heater is in an open state, the first driving device 400 is powered to drive the power generation device 300 to open or close according to temperature changes. The first driving device 400 includes an induction coil 410 and a first magnet 420, the induction coil 410 is arranged inside the smoke exhaust pipe body 110, and the first magnet 420 is fixed to the inner cylinder 120.

[0072] When the temperature is higher than the prevention temperature, the induction coil 410 is not powered, at this time the induction coil 410 does not generate a magnetic field, and the induction coil 410 does not attract the first magnet 420. When the temperature is lower than the prevention temperature, the induction coil 410 is powered to generate a magnetic field, and the induction coil 410 and the first magnet 420 can attract each other to make the permanent magnet 350 and the stator 340 in the same axial position x, at this time the impeller 310 is driven by the external wind to rotate the permanent magnet 350, and then the power generation device 300 can supply power to the heating device 200, and the heating device 200 heats the smoke exhaust pipe body 110 to prevent the smoke exhaust pipe body 110 from freezing.

[0073] When the water heater is in a closed state, the second driving device 500 can change its size according to temperature changes to drive the power generation device 300 to open or close.

[0074] The second driving device 500 includes a sandwich layer 510 arranged between the smoke exhaust pipe body 110 and the inner cylinder 120, and the sandwich layer 510 can change its size according to temperature changes to make the inner cylinder 120 move back and forth along the axial direction x relative to the smoke exhaust pipe body 110.

[0075] When the volume of the interlayer 510 is small, the permanent magnet 350 and the stator 340 are staggered in the axial x position, the stator 340 hardly cuts the magnetic induction lines, and the power generation device 300 does not generate electric energy. When the volume of the interlayer 510 increases, the interlayer 510 can push the inner cylinder 120 to move relative to the flue body 110, so that the permanent magnet 350 and the stator 340 are in the same axial x position, the impeller 310 is driven by external wind to rotate the permanent magnet 350, at this time the effect of cutting the magnetic induction lines is strong, thereby generating electric energy, and then the heating device 200 is powered to heat.

[0076] The interlayer 510 includes a skin film 511, the skin film 511 is filled with a phase change fluid 512, one end of the skin film 511 is fixed to the flue body 110, and the other end of the skin film 511 abuts against the inner cylinder 120. The interlayer 510 adopts a structure that the skin film 511 is filled with the phase change fluid 512, the phase change fluid 512 can change its volume according to temperature changes, one end of the skin film 511 is fixed to the flue body 110, and the other end of the skin film 511 abuts against the inner cylinder 120, so that when the volume of the phase change fluid 512 changes, the phase change fluid 512 can change the volume of the skin film 511, and the skin film 511 pushes the inner cylinder 120 to move relative to the flue body 110.

[0077] In this embodiment, the phase change fluid 512 is in a liquid state when the temperature is above the preset temperature, and is in a solid state when the temperature is below the preset temperature, the volume of the solid state of the phase change fluid 512 is greater than the volume of the liquid state of the phase change fluid 512, and the temperature is prevented from being higher than the preset temperature.

[0078] In other embodiments, a phase change fluid 512 with a larger volume in a liquid state can also be selected, and a structure matched with the phase change fluid 512 is arranged to realize the function of moving the inner cylinder 120.

[0079] When the water heater is in an open state, the water heater determines whether the power generation device 300 is opened or not based on the prevention temperature, and when the water heater is in a closed state, the water heater determines whether the power generation device 300 is opened or not based on the preset temperature. The prevention temperature is set to be higher than the preset temperature, when the water heater is in an open state, the power generation device 300 is opened when the temperature is lower than the prevention temperature, and then the flue body 110 is heated to prevent the flue body 110 from freezing, that is, the power generation device 300 is started at a higher temperature, which effectively prevents the flue body 110 from freezing, ensures that the flue body 110 always remains in a non-frozen state, and the water heater can operate normally. When the water heater is in a closed state, the flue body 110 does not need to be kept in a non-frozen state at all times, and the opening temperature of the power generation device 300 can be set to be lower, that is, the power generation device 300 is opened when the temperature is lower than the preset temperature, so that the power generation device 300 can be avoided from being frequently opened to cause structural wear and tear, and the service life is prolonged.

[0080] In the embodiment, the prevention temperature is 5°C and the preset temperature is 0°C. When the temperature is lower than 5°C while the water heater is on, the first driving device 400 drives the power generation device 300 to supply power to the heating device 200, and the heating device 200 heats the smoke exhaust pipe 100 to prevent the smoke exhaust pipe 100 from freezing. Thus, the smoke exhaust pipe body 110 is always kept in a non-frozen state. When the water heater is off, and the temperature is lower than 0°C, the smoke exhaust hole 111 is frozen, the second driving device 500 drives the power generation device 300 to supply power to the heating device 200, and the heating device 200 heats the smoke exhaust pipe 100 to melt the ice frozen on the smoke exhaust hole 111, so as to ensure that the water heater can work normally when it is needed to work. In other embodiments, the skilled in the art can select other suitable prevention temperature and preset temperature setting values according to actual needs.

[0081] The interlayer 510 further comprises a second magnet 513 opposite to the first magnet 420 in polarity, and the second magnet 513 is fixed to the smoke exhaust pipe body 110. The first magnet 420 and the second magnet 513 attract each other to make the permanent magnet 350 and the stator 340 staggered in the axial x position.

[0082] The first magnet 420 is fixed to the inner cylinder 120, and the second magnet 513 is fixed to the smoke exhaust pipe body 110. The first magnet 420 and the second magnet 513 can attract each other, so as to drive the relative position of the inner cylinder 120 and the smoke exhaust pipe body 110 to change, so that the permanent magnet 350 and the stator 340 can be staggered in the axial x position, and the impeller 310 no longer generates electricity when rotating.

[0083] The heating device 200 comprises an electric heating element 210 and a heat-conducting sheet 220. The electric heating element 210 is electrically connected to the power generation device 300, and the heat-conducting sheet 220 is connected to the electric heating element 210. The electric heating element 210 and the heat-conducting sheet 220 are arranged at the periphery of the smoke exhaust hole 111. When the power generation device 300 generates electricity, the electric heating element 210 is powered on to start heating, and the heat energy is conducted to the periphery of the smoke exhaust hole 111 through the heat-conducting sheet 220 connected to the electric heating element 210, so as to melt the ice blocking the smoke exhaust hole 111, and ensure that the water heater can work normally.

[0084] In the embodiment, the electric heating element 210 and the heat-conducting sheet 220 extend in different directions, so that the periphery of the smoke exhaust hole 111 can be better heated. In other embodiments, the skilled in the art can select suitable setting positions and extension directions of the electric heating element 210 and the heat-conducting sheet 220 according to actual needs.

[0085] The water heater further comprises a control device 600, which is electrically connected to the first driving device 400, and the control device 600 can control the opening or closing of the first driving device 400 according to the temperature change, thereby controlling the opening or closing of the power generation device 300. When the temperature reaches the set value, the control device 600 opens the first driving device 400, and the first driving device 400 drives the power generation device 300 to open, thereby enabling the power generation device 300 to supply power to the heating device 200.

[0086] The water heater further comprises a temperature sensor 700, which is electrically connected to the control device 600, and the temperature sensor 700 is arranged on the water inlet of the water heater, and the temperature sensor 700 is used to detect the water temperature of the water heater.

[0087] The water heater further comprises a temperature sensor 700, which is electrically connected to the control device 600, and the temperature sensor 700 is arranged on the water inlet of the water heater, and the temperature sensor 700 is used to detect the water temperature of the water heater.

[0088] In the embodiment, the temperature sensor 700 is used to detect the water temperature of the water heater. In other embodiments, the temperature sensor 700 can also detect the temperature of the external air, and those skilled in the art can select a suitable detection object of the temperature sensor 700 according to actual needs.

[0089] In the description of the application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship of the device or element in the normal use, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation at any time, and therefore cannot be understood as a limitation on the application in this respect.

[0090] Although the specific embodiments of the application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the application, and such changes and modifications all fall within the protection scope of the application.

Claims

1. A water heater comprising a flue, the flue comprising a flue body and a heating device for heating the flue body to restore the flue body to a non-frozen state, characterised in that, The smoke exhaust pipe further comprises a power generation device, a first driving device and a second driving device, the power generation device is electrically connected to the heating device, and the power generation device is used for supplying power for the heating device; When the water heater is in an open state, the first driving device is powered to enable the first driving device to drive the power generation device to open or close according to temperature changes; when the water heater is in a closed state, the second driving device can change its size according to temperature changes to drive the power generation device to open or close.

2. The water heater of claim 1, wherein The smoke exhaust pipe further comprises an inner cylinder, and the power generation device comprises an impeller, a rotating shaft, a rotor, a stator, a permanent magnet and a current collector ring; The impeller is arranged outside the smoke exhaust pipe body, the impeller is connected to the rotating shaft, the impeller can drive the rotating shaft to rotate along the circumference of the smoke exhaust pipe body, the rotor is connected to the rotating shaft, the permanent magnet is arranged on the rotor, and the current collector ring is electrically connected to the heating device; The stator is fixed to the inner cylinder, and the inner cylinder can move along the axial direction of the smoke exhaust pipe body to enable the permanent magnet and the stator to be located at the same axial position.

3. The water heater of claim 2, wherein the heater is a gas burner. The first driving device comprises an induction coil and a first magnet, the induction coil is arranged inside the smoke exhaust pipe body, and the first magnet is fixed to the inner cylinder; When the temperature is higher than the prevention temperature, the induction coil is not powered; when the temperature is lower than the prevention temperature, the induction coil is powered to enable the induction coil to generate a magnetic field, and the induction coil and the first magnet can attract each other to enable the permanent magnet and the stator to be located at the same axial position.

4. The water heater of claim 3, wherein the controller is configured to: The second driving device comprises a sandwich layer, the sandwich layer is arranged between the smoke exhaust pipe body and the inner cylinder, and the sandwich layer can change its size according to temperature changes to enable the inner cylinder to move back and forth along the axial direction relative to the smoke exhaust pipe body.

5. The water heater of claim 4, wherein the controller is configured to: The sandwich layer comprises a skin film, the skin film is filled with a phase change fluid, one end of the skin film is fixed to the smoke exhaust pipe body, and the other end of the skin film abuts against the inner cylinder.

6. The water heater of claim 5, wherein the controller is configured to: When the temperature is above the preset temperature, the phase change fluid is in a liquid state, when the temperature is below the preset temperature, the phase change fluid is in a solid state, the volume of the solid state of the phase change fluid is greater than the volume of the liquid state of the phase change fluid, and the prevention temperature is higher than the preset temperature.

7. The water heater of claim 4, wherein the heater is a gas burner. The sandwich layer further comprises a second magnet which is opposite in polarity to the first magnet, the second magnet is fixed to the smoke exhaust pipe body, and the first magnet and the second magnet attract each other to enable the permanent magnet and the stator to be staggered in the axial position.

8. The water heater of claim 1, wherein The smoke exhaust pipe body has a plurality of smoke exhaust holes, the heating device comprises an electric heating element and a heat conduction sheet, the electric heating element is electrically connected to the power generation device, the heat conduction sheet is connected to the electric heating element, and the electric heating element and the heat conduction sheet are arranged at the periphery of the smoke exhaust hole.

9. The water heater of any one of claims 1-8, wherein the heater is a tankless water heater. The water heater further comprises a control device, the control device is electrically connected to the first driving device, and the control device can control the opening or closing of the first driving device according to temperature changes.

10. The water heater of claim 9, wherein the controller is configured to: The water heater further comprises a temperature sensor electrically connected to the control device, the temperature sensor being arranged on a water inlet of the water heater and used for detecting a water inlet temperature of the water heater.

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