Water heater

Abstract

The invention discloses a water heater, and relates to the technical field of household appliances. The water heater comprises the 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 can recover to the non-freezing state, the smoke exhaust pipe further comprises a power generation device, a first driving device and a second driving device, and the power generation device is electrically connected to the heating device and used for supplying power to the heating device. When the water heater is in an on state, the first driving device is powered on so that the first driving device can drive the power generation device to be turned on or turned off according to temperature changes. When the water heater is in a closed state, the second driving device can change the size of the second driving device according to temperature changes so as to drive the power generation device to be turned on or turned off. No matter the water heater is in an on state or an off state, the smoke exhaust pipe can achieve a good anti-freezing effect, the smoke exhaust pipe is prevented from being blocked, and electric energy consumption is reduced.

Description

Technical Field

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

[0002] When using gas water heaters in the winter in northern regions, the water vapor in the flue gas discharged from the exhaust pipe is affected by the strong cold air outside, and it is very easy to quickly condense and accumulate around the exhaust port of the smoke pipe, causing the exhaust pipe to freeze and block, and the gas water heater cannot be started normally, and there are safety hazards. In the prior art, a heating device is arranged on the exhaust pipe, and then the exhaust pipe is heated by the heating device, so as to avoid the exhaust pipe from being blocked and ensure the normal use of the exhaust pipe. However, the heating device consumes additional electricity, the power consumption is large, and it cannot play an anti-freezing effect when the power is off. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a water heater in order to overcome the defects in the prior art that the antifreeze of the exhaust pipe of the water heater requires additional electric energy, consumes a large amount of electric energy, and has a poor antifreeze effect when the power is off.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present invention provides a water heater, 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 to heat the smoke exhaust pipe body to restore the smoke exhaust pipe body to a non-frozen state, the smoke exhaust pipe further comprises a power generation device, a first drive device and a second drive device, the power generation device is electrically connected to the heating device, and the power generation device is used to supply power to the heating device;

[0006] When the water heater is in the on state, the first driving device is energized so that the first driving device can drive the power generation device to turn on or off according to temperature changes; when the water heater is in the off state, the second driving device can change its own volume size according to temperature changes to drive the power generation device to turn on or off.

[0007] In this solution, the exhaust pipe of the water heater is provided with a heating device, a power generation device, a first drive device and a second drive device. The power generation device can supply power to the heating device, and the heating device can heat the exhaust pipe body, so that the exhaust pipe body is restored to a non-frozen state. When the water heater is in the on state, the first drive device is energized so that the first drive device can drive the power generation device to open or close according to the temperature change. It only needs to supply power to the first drive device, and the first drive device can generate power according to the temperature change. The power generation device then provides electrical energy for the heating device without continuously supplying power to the heating device, saving the energy consumption of the water heater. When the water heater is in the off state, the second drive device can change its own volume according to the temperature change to drive the power generation device to open or close. The second drive device can open or close the power generation device without consuming electrical energy, and the power generation device then provides electrical energy for the heating device. Whether the water heater is in the on or off state, the exhaust pipe can achieve a good antifreeze effect, avoid clogging of the exhaust pipe, and save electrical energy consumption.

[0008] Preferably, 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 collector ring;

[0009] 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 collector ring is electrically connected to the heating device;

[0010] The stator is fixed on the inner cylinder, and the inner cylinder can move along the axial direction of the smoke exhaust pipe body so that the permanent magnet and the stator are located at the same axial position.

[0011] In this solution, an impeller is arranged outside the exhaust pipe body, so that the wind outside the exhaust pipe drives the impeller to rotate, and the rotating shaft is connected to the impeller. 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, and the permanent magnet arranged on the rotor also rotates accordingly. The stator is fixed on 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 permanent magnet and the stator are relatively staggered in the axial direction, the impeller is affected by the external wind force and drives the permanent magnet to rotate, and the stator does not produce magnetic flux lines or the amount of cutting is very small, that is, no electricity is generated or very little electricity is generated. When the permanent magnet and the stator are in the same axial position, the impeller is affected by the external wind force and drives the permanent magnet to rotate. At this time, the effect of cutting the magnetic flux lines is strong, and electricity is gradually generated. The electricity is stored in the collector ring, and the collector ring is electrically connected to the heating device, so that the collector ring can provide electrical energy to the heating device, and 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 and a first magnet, the induction coil is arranged inside the smoke exhaust pipe body, and the first magnet is fixed to the inner tube;

[0014] When the temperature is higher than the prevention temperature, the induction coil is not energized; when the temperature is lower than the prevention temperature, the induction coil is energized 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 located at the same axial position.

[0015] In this solution, when the water heater is in the on state, the first drive device is energized so that the first drive device can drive the power generation device to turn on or off according to the temperature change. An induction coil is provided inside the smoke exhaust pipe body, and a first magnet is fixed on the inner cylinder. When the temperature is higher than the prevention temperature, the induction coil is not energized, and the induction coil does not generate a magnetic field, and the induction coil does not attract the first magnet. When the temperature is lower than the prevention temperature, the induction coil is energized so that the induction coil generates a magnetic field, and the induction coil and the first magnet can attract each other, so that the permanent magnet and the stator are located in the same axial position. At this time, the impeller is affected by the external wind force to drive the permanent magnet to rotate, so that the power generation device can supply power to the heating device, and the heating device heats the smoke exhaust pipe body to prevent the smoke exhaust pipe body from freezing.

[0016] Preferably, the second driving device comprises an interlayer, which is provided between the smoke exhaust pipe body and the inner tube, and the interlayer can change its volume according to temperature changes so as to enable the inner tube to move back and forth axially relative to the smoke exhaust pipe body.

[0017] In this solution, when the water heater is in the off state, the second drive device can change its own volume according to temperature changes to drive the power generation device to open or close. The second drive device includes an interlayer, which is arranged between the smoke pipe body and the inner cylinder, and the interlayer can change its volume according to temperature changes. When the volume of the interlayer is small, the permanent magnet and the stator are staggered in the axial position, the stator hardly cuts the magnetic flux lines, and the power generation device does not generate electrical energy. When the volume of the interlayer increases, the interlayer can push the inner cylinder to move relative to the smoke exhaust pipe body, so that the permanent magnet and the stator are in the same axial position, and the impeller is affected by the external wind force to drive the permanent magnet to rotate. At this time, the effect of cutting the magnetic flux lines is strong, thereby generating electrical energy, and then the heating device is powered on for heating.

[0018] Preferably, the interlayer includes a membrane, the membrane is filled with a phase change fluid, one end of the membrane is fixed to the smoke exhaust pipe body, and the other end of the membrane is in contact with the inner tube.

[0019] In this solution, the interlayer adopts a structure in which a phase change fluid is filled in the membrane. The phase change fluid can change its volume according to temperature changes. One end of the membrane is fixed to the smoke exhaust pipe body, and the other end of the membrane is abutted against the inner tube. Therefore, when the volume of the phase change fluid changes, the phase change fluid can change the volume of the membrane, and the membrane pushes the inner tube to move relative to the smoke exhaust pipe body.

[0020] Preferably, above a preset temperature, the phase change fluid is in a liquid state, and below a 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.

[0021] In this solution, when the water heater is in the on state, the water heater uses the prevention temperature as a boundary to determine whether the power generation device is turned on, and when the water heater is in the off state, the water heater uses the preset temperature as a boundary to determine whether the power generation device is turned on. The prevention temperature is set to be higher than the preset temperature. When the water heater is in the on state, the power generation device is turned on when the temperature is lower than the prevention temperature, and then the exhaust pipe body is heated to prevent the exhaust pipe body from freezing. That is, the power generation device is started at a higher temperature, which effectively prevents the exhaust pipe body from freezing, ensuring that the exhaust pipe body always remains in a non-frozen state, and the water heater can operate normally. When the water heater is in the off state, the exhaust pipe body does not need to remain 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 turned on when the temperature is lower than the preset temperature, thereby avoiding frequent opening of the power generation device to cause structural wear and extending the service life.

[0022] Preferably, the interlayer further comprises a second magnet having 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 so that the permanent magnet and the stator are staggered in axial position.

[0023] In this solution, 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 relative position of the inner cylinder and the smoke exhaust pipe body to change, so that the permanent magnet and the stator can be staggered in the axial position, and the impeller no longer generates electrical 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 conductive sheet, the electric heating element is electrically connected to the power generation device, the heat conductive sheet is connected to the electric heating element, and the electric heating element and the heat conductive sheet are arranged around the smoke exhaust holes.

[0025] In this solution, the exhaust pipe body has multiple exhaust holes. When the temperature is too low, the exhaust holes will freeze and block, causing the gas water heater to fail to start normally. The heating device includes an electric heating element and a heat conducting sheet. 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 and starts to heat, and conducts heat energy to the periphery of the exhaust hole through the heat conducting sheet connected to the electric heating element, thereby melting the ice blocking the exhaust hole and ensuring the normal operation of the water heater.

[0026] Preferably, the water heater further comprises a control device, wherein the control device is electrically connected to the first driving device, and the control device can control the first driving device to be turned on or off according to temperature changes.

[0027] In this solution, when the water heater is in the on state, the power generation device is turned on or off by the first driving device, and the water heater is also provided with a control device, which is electrically connected to the first driving device, and the control device can control the first driving device to be turned on or off according to the temperature change, thereby controlling the power generation device to be turned on or off. When the temperature reaches the set value, the control device turns on the first driving device, and the first driving device drives the power generation device to turn on, thereby enabling the power generation device to supply power to the heating device.

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

[0029] In this solution, the water heater is also provided with a temperature sensor to detect the inlet water temperature of the water heater. When the temperature sensor detects that the inlet water temperature reaches the set value, the control device controls the opening of the first drive device according to the detection structure of the temperature sensor, and the first drive device drives the power generation device to turn on, thereby enabling the power generation device to supply power to the heating device.

[0030] The positive and progressive effects of the present invention are:

[0031] The exhaust pipe of the water heater is provided with a heating device, a power generation device, a first drive device and a second drive device. The power generation device can supply power to the heating device, and the heating device can heat the exhaust pipe body, so that the exhaust pipe body is restored to a non-frozen state. When the water heater is in the open state, the first drive device is energized so that the first drive device can drive the power generation device to open or close according to the temperature change. It only needs to supply power to the first drive device, and the first drive device can generate power according to the temperature change. The power generation device then provides electrical energy for the heating device without continuously supplying power to the heating device, saving the energy consumption of the water heater. When the water heater is in the closed state, the second drive device can change its own volume according to the temperature change to drive the power generation device to open or close. The second drive device can open or close the power generation device without consuming electrical energy, and the power generation device then provides electrical energy for the heating device. Whether the water heater is in the open or closed state, the exhaust pipe can achieve a good antifreeze effect, avoid clogging of the exhaust pipe, and save electrical energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of a water heater according to an embodiment of the present invention.

[0033] Figure 2 Schematic diagram of the structure of a smoke exhaust pipe before freezing according to an embodiment of the present invention.

[0034] Figure 3 Schematic diagram of the structure of a smoke exhaust pipe after freezing according to an embodiment of the present invention.

[0035] Figure 4 FIG. 4 is a schematic diagram of a three-dimensional structure of an impeller according to an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] Exhaust pipe 100

[0038] Smoke exhaust pipe body 110

[0039] Smoke exhaust vent 111

[0040] Inner tube 120

[0041] Heating device 200

[0042] Electric heating element 210

[0043] Thermal conductive sheet 220

[0044] Power generation device 300

[0045] Impeller 310

[0046] Rotation axis 320

[0047] Rotor 330

[0048] Stator 340

[0049] Permanent magnet 350

[0050] Slip ring 360

[0051] Support 370

[0052] First driving device 400

[0053] Induction coil 410

[0054] First magnet 420

[0055] Second driving device 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] Axis x DETAILED DESCRIPTION

[0063] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the following examples.

[0064] like Figure 1 As shown, this embodiment provides a water heater, which includes a smoke exhaust pipe 100. The smoke exhaust pipe body 110 has a plurality of smoke exhaust holes 111. When the temperature is too low, the smoke exhaust holes 111 will freeze and be blocked, causing the gas water heater to fail to start normally.

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

[0066] When the water heater is in the on state, the first drive device 400 is energized so that the first drive device 400 can drive the power generation device 300 to turn on or off according to temperature changes. It only needs to power the first drive device 400, and the first drive device 400 can enable the power generation device 300 to generate electricity according to temperature changes. The power generation device 300 then provides electrical energy to the heating device 200 without the need to continuously power the heating device 200, thereby saving energy consumption of the water heater.

[0067] When the water heater is in the off state, the second driving device 500 can change its own volume according to the temperature change to drive the power generation device 300 to open or close. The second driving device 500 can open or close the power generation device 300 without consuming electric energy, and the power generation device 300 further provides electric energy for the heating device 200. Whether the water heater is in the on or off state, the smoke exhaust pipe 100 can achieve a good antifreeze effect, avoid clogging of the smoke exhaust pipe 100, and save electric energy consumption.

[0068] The smoke exhaust pipe 100 further includes an inner cylinder 120, and the power generation device 300 includes an impeller 310, a rotating shaft 320, a rotor 330, a stator 340, a permanent magnet 350, a collector ring 360, and a support 370. The impeller 310 is disposed outside the smoke exhaust pipe body 110, and the impeller 310 is connected to the rotating shaft 320. The impeller 310 can drive the rotating shaft 320 to rotate along the circumferential direction of the smoke exhaust pipe body 110, the rotor 330 is connected to the rotating shaft 320, the permanent magnet 350 is disposed on the rotor 330, and the 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 on the inner cylinder 120, and the inner cylinder 120 can move along the axial direction x of the smoke exhaust pipe body 110 so that the permanent magnet 350 and the stator 340 are located at the same axial x position, where the axial direction x refers to the direction of the central axis of the smoke exhaust pipe 100. Figure 2 and Figure 3 The specific direction of the axial direction x is shown in FIG.

[0069] By arranging the impeller 310 outside the smoke exhaust pipe body 110, the wind outside the smoke exhaust pipe 100 drives the impeller 310 to rotate, the rotating shaft 320 is connected to the impeller 310, and the impeller 310 drives the rotating shaft 320 to rotate along the circumferential direction of the smoke exhaust pipe body 110, thereby driving the rotor 330 connected to the rotating shaft 320 to rotate, and the permanent magnet 350 arranged on the rotor 330 also rotates accordingly. The stator 340 is fixed on the inner cylinder 120, and the inner cylinder 120 can move along the smoke 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 positions of the permanent magnet 350 and the stator 340 in the axial direction x are relatively staggered, the impeller 310 is affected by the external wind force and drives the permanent magnet 350 to rotate, and the stator 340 does not produce magnetic flux lines cutting or the cutting amount is very small, that is, no electricity is generated or very little electricity is generated. When the permanent magnet 350 and the stator 340 are in the same axial position x, the impeller 310 is affected by the external wind force and drives the permanent magnet 350 to rotate. At this time, the effect of cutting the magnetic flux lines is strong, and electricity is gradually generated. The electricity is stored in the collector ring 360, and the collector ring 360 is electrically connected to the heating device 200, so that the collector ring 360 can provide electrical energy for the heating device 200, and the heating device 200 heats the exhaust pipe body 110 to prevent the exhaust pipe body 110 from freezing.

[0071] When the water heater is in the on state, the first driving device 400 is energized so that the first driving device 400 can drive the power generation device 300 to turn on or off according to the temperature change. 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 energized, and 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 energized to generate a magnetic field, and the induction coil 410 and the first magnet 420 can attract each other so that the permanent magnet 350 and the stator 340 are located at the same axial x position. At this time, the impeller 310 is affected by the external wind force and drives the permanent magnet 350 to rotate, so that the power generation device 300 can supply power to the heating device 200, and the heating device 200 heats the exhaust pipe body 110 to prevent the exhaust pipe body 110 from freezing.

[0073] When the water heater is in the off state, the second driving device 500 can change its own volume according to the temperature change to drive the power generation device 300 to turn on or off.

[0074] The second driving device 500 includes an interlayer 510 disposed between the smoke exhaust pipe body 110 and the inner tube 120 . The interlayer 510 can change its volume according to temperature changes so that the inner tube 120 moves 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 almost does not cut the magnetic flux lines, and the power generation device 300 does not generate electrical energy. When the volume of the interlayer 510 increases, the interlayer 510 can push the inner cylinder 120 to move relative to the smoke exhaust pipe body 110, so that the permanent magnet 350 and the stator 340 are in the same axial x position, and the impeller 310 is affected by the external wind force to drive the permanent magnet 350 to rotate. At this time, the effect of cutting the magnetic flux lines is strong, thereby generating electrical energy, and then the heating device 200 is powered on for heating.

[0076] The interlayer 510 includes a membrane 511, which is filled with a phase-change fluid 512. One end of the membrane 511 is fixed to the exhaust pipe body 110, and the other end of the membrane 511 is in contact with the inner tube 120. The interlayer 510 adopts a structure in which the membrane 511 is filled with a phase-change fluid 512. The phase-change fluid 512 can change its volume according to temperature changes. One end of the membrane 511 is fixed to the exhaust pipe body 110, and the other end of the membrane 511 is in contact with the inner tube 120. Therefore, when the volume of the phase-change fluid 512 changes, the phase-change fluid 512 can change the volume of the membrane 511, and the membrane 511 pushes the inner tube 120 to move relative to the exhaust pipe body 110.

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

[0078] In other embodiments, a phase-change fluid 512 with a larger volume in a liquid state may be selected, and a structure matching the phase-change fluid 512 may be provided to realize the function of moving the inner cylinder 120 .

[0079] When the water heater is in the on state, the water heater determines whether the power generation device 300 is turned on based on the prevention temperature, and when the water heater is in the off state, the water heater determines whether the power generation device 300 is turned on based on the preset temperature. The prevention temperature is set to be higher than the preset temperature. When the water heater is in the on state, the power generation device 300 is turned on when the temperature is lower than the prevention temperature, and then the exhaust pipe body 110 is heated to prevent the exhaust pipe body 110 from freezing, that is, the power generation device 300 is started at a higher temperature, which effectively prevents the exhaust pipe body 110 from freezing, ensuring that the exhaust pipe body 110 always remains in a non-freezing state, and the water heater can operate normally. When the water heater is in the off state, the exhaust pipe body 110 does not need to remain in a non-freezing 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 turned on when the temperature is lower than the preset temperature, thereby avoiding frequent opening of the power generation device 300 to cause structural wear and extend the service life.

[0080] In this embodiment, the preventive temperature is 5°C and the preset temperature is 0°C. When the water heater is turned on, when the temperature is lower than 5°C, the first drive device 400 drives the power generation device 300 to power the heating device 200, and the heating device 200 heats the exhaust pipe 100 to prevent the exhaust pipe 100 from freezing. Thereby, the exhaust pipe body 110 is always kept in a non-frozen state. When the water heater is turned off, when the temperature is lower than 0°C, the exhaust hole 111 is frozen, and the second drive device 500 drives the power generation device 300 to power the heating device 200, and the heating device 200 heats the exhaust pipe 100 to melt the ice frozen on the exhaust hole 111, ensuring that the water heater can work normally when it is needed. In other embodiments, those skilled in the art can select other suitable set values ​​of the preventive temperature and the preset temperature according to actual needs.

[0081] The interlayer 510 further includes a second magnet 513 having a polarity opposite to that of the first magnet 420 . The second magnet is fixed to the smoke exhaust pipe body 110 . The first magnet 420 and the second magnet 513 attract each other to cause the permanent magnet 350 and the stator 340 to be offset in the axial x position.

[0082] The first magnet 420 is fixed on the inner cylinder 120, and the second magnet 513 is fixed on the smoke exhaust pipe body 110. The first magnet 420 and the second magnet 513 can attract each other, thereby driving 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 electrical energy when rotating.

[0083] The heating device 200 includes an electric heating element 210 and a heat conductive sheet 220. The electric heating element 210 is electrically connected to the power generation device 300. The heat conductive sheet 220 is connected to the electric heating element 210. The electric heating element 210 and the heat conductive sheet 220 are arranged around the smoke exhaust hole 111. When the power generation device 300 generates electricity, the electric heating element 210 is powered on and starts to heat, and conducts heat energy to the periphery of the smoke exhaust hole 111 through the heat conductive sheet 220 connected to the electric heating element 210, thereby melting the ice blocking the smoke exhaust hole 111 and ensuring the normal operation of the water heater.

[0084] In this embodiment, the electric heating element 210 and the heat conducting sheet 220 extend in different directions, so that a good heating effect can be obtained around the smoke exhaust hole 111. In other embodiments, those skilled in the art can select appropriate locations and extension directions of the electric heating element 210 and the heat conducting sheet 220 according to actual needs.

[0085] The water heater further includes a control device 600, which is electrically connected to the first drive device 400. The control device 600 can control the first drive device 400 to be turned on or off according to temperature changes, thereby controlling the power generation device 300 to be turned on or off. When the temperature reaches the set value, the control device 600 turns on the first drive device 400, and the first drive device 400 drives the power generation device 300 to be turned on, 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 . The temperature sensor 700 is disposed on the water inlet of the water heater, and is used to detect the water inlet temperature of the water heater.

[0087] The water heater is also provided with a temperature sensor 700 to detect the water inlet temperature of the water heater. When the temperature sensor 700 detects that the water inlet temperature reaches the set value, the control device 600 controls the opening of the first drive device 400 according to the detection structure of the temperature sensor 700. The first drive device 400 drives the power generation device 300 to turn on, thereby enabling the power generation device 300 to supply power to the heating device 200.

[0088] In this embodiment, the temperature sensor 700 is used to detect the water inlet temperature of the water heater. In other embodiments, the temperature sensor 700 can also detect the temperature of the outside air. 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 invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship of the device or component in normal use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation at any time, and therefore cannot be understood as a limitation of the present invention in this regard.

[0090] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A water heater, comprising a smoke exhaust pipe, wherein the smoke exhaust pipe comprises a smoke exhaust pipe body and a heating device, wherein the heating device is used to heat the smoke exhaust pipe body to restore the smoke exhaust pipe body to a non-frozen state, wherein: The smoke exhaust pipe further comprises a power generation device, a first drive device and a second drive device, wherein the power generation device is electrically connected to the heating device, and the power generation device is used to supply power to the heating device; When the water heater is in the on state, the first driving device is energized so that the first driving device can drive the power generation device to turn on or off according to temperature changes; when the water heater is in the off state, the second driving device can change its own volume size according to temperature changes to drive the power generation device to turn on or off.

2. The water heater according to claim 1, characterized in that The smoke exhaust pipe also includes an inner cylinder, and the power generation device includes an impeller, a rotating shaft, a rotor, a stator, a permanent magnet and a 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 collector ring is electrically connected to the heating device; The stator is fixed on the inner cylinder, and the inner cylinder can move along the axial direction of the smoke exhaust pipe body so that the permanent magnet and the stator are located at the same axial position.

3. The water heater according to claim 2, characterized in that: The first driving device includes an induction coil and a first magnet, wherein the induction coil is arranged inside the smoke exhaust pipe body, and the first magnet is fixed to the inner tube; When the temperature is higher than the prevention temperature, the induction coil is not energized; when the temperature is lower than the prevention temperature, the induction coil is energized 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 located at the same axial position.

4. The water heater according to claim 3, characterized in that: The second driving device comprises an interlayer, which is arranged between the smoke exhaust pipe body and the inner tube. The interlayer can change its volume according to temperature changes, so that the inner tube moves back and forth axially relative to the smoke exhaust pipe body.

5. The water heater according to claim 4, characterized in that The interlayer includes a membrane filled with a phase change fluid, one end of the membrane is fixed to the smoke exhaust pipe body, and the other end of the membrane is in contact with the inner tube.

6. The water heater according to claim 5, characterized in that When the temperature is above the preset temperature, the phase change fluid is in a liquid state, and 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 according to claim 4, characterized in that The interlayer further comprises a second magnet having a polarity opposite to that of the first magnet, the second magnet being fixed to the smoke exhaust pipe body, and the first magnet and the second magnet attract each other so that the permanent magnet and the stator are staggered in axial position.

8. The water heater according to claim 1, characterized in that The smoke exhaust pipe body has a plurality of smoke exhaust holes, and the heating device includes an electric heating element and a heat conductive sheet, the electric heating element is electrically connected to the power generation device, the heat conductive sheet is connected to the electric heating element, and the electric heating element and the heat conductive sheet are arranged around the smoke exhaust holes.

9. The water heater according to any one of claims 1 to 8, characterized in that: The water heater further comprises a control device, which is electrically connected to the first driving device and can control the first driving device to be turned on or off according to temperature changes.

10. The water heater according to claim 9, characterized in that The water heater further comprises a temperature sensor, which is electrically connected to the control device and is disposed on the water inlet of the water heater. The temperature sensor is used to detect the water inlet temperature of the water heater.

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