Clothes dryer

Abstract

The invention relates to the technical field of clothes dryers, in particular to a clothes dryer, and aims to solve the problem that a sensor in a clothes dryer in the prior art is poor in reliability in detecting the drying state of clothes. In order to achieve the purpose, the clothes dryer comprises an inner barrel, a metal plate and a sensor are arranged in the inner barrel, the metal plate is connected with the inner barrel through an insulating part, the metal plate is electrically connected with the sensor and a signal transmitting module, the inner barrel is made of metal materials, and the sensor is used for detecting capacitance between the metal plate and the inner barrel. The metal plate is arranged in the inner drum, the capacitance between the metal plate and the inner drum is detected through the sensor, and the drying degree of clothes in the inner drum can be judged more accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of clothes dryers, and in particular provides a clothes dryer. Background Art

[0002] Drum dryers generally use sensors to detect the drying status of clothes, usually using resistance sensors or temperature sensors. When using resistance sensors, the dryness of clothes is determined by the resistance of the clothes falling on the electrodes. However, the consistency of the way of detecting clothes through electrodes is poor. In the case where the clothes are only partially dry, if the clothes falling on the electrodes are just dry, then the clothes will be judged to be dry. In addition, the safety of exposing the electrodes with electricity is also poor. If a temperature sensor is used, the temperature of the air at the drum outlet is detected by the temperature sensor to determine the dryness of the clothes. It is often the case that the detected temperature has reached the set value but the clothes are still wet. Therefore, the effect of detecting the outlet temperature through the temperature sensor is still poor.

[0003] Accordingly, there is a need in the art for a new clothes dryer to solve the problem of poor reliability of the sensor in the clothes dryer in the prior art in detecting the drying state of the clothes. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the reliability of the sensor in the clothes dryer in detecting the drying state of the clothes in the prior art is poor.

[0005] In a first aspect, the present invention provides a clothes dryer, comprising an inner drum, wherein a metal plate and a sensor are arranged in the inner drum, wherein the metal plate is connected to the inner drum via an insulating member, wherein the metal plate is electrically connected to the sensor and a signal transmitting module, wherein the inner drum is made of metal, and wherein the sensor is used to detect the capacitance between the metal plate and the inner drum.

[0006] In a preferred technical solution of the above-mentioned clothes dryer, the clothes dryer further comprises a power storage module, and the power storage module is used to supply power to the sensor.

[0007] In the preferred technical solution of the above-mentioned dryer, the dryer also includes a self-generating device, which is arranged on the inner drum, connected to the sensor and the signal transmitting module, and can supply power to the sensor and the signal transmitting module.

[0008] In the preferred technical solution of the above-mentioned clothes dryer, a circuit board is further provided in the clothes dryer, and the circuit board is connected to the signal transmitting module, the power storage module and the sensor through wires.

[0009] In the preferred technical solution of the above-mentioned dryer, the self-generating device includes a coil bracket, a coil and an iron core, the coil is arranged on the inner drum, a hollow channel is arranged in the coil bracket, the iron core is arranged in the hollow channel, the coil is wound on the coil bracket, and a magnetic group is also fixedly arranged in the dryer so that the coil cuts the magnetic lines of force under the drive of the inner drum.

[0010] In the preferred technical solution of the above-mentioned dryer, the self-generating device includes a sleeve and a piezoelectric material, an impact block and a spring member arranged in the sleeve, the impact block is arranged between the spring and the piezoelectric material, the impact block hits the piezoelectric material under the elastic force of the spring member to enable the piezoelectric material to generate electricity, and the impact block is also provided with a protruding member, which passes through the sleeve and the inner drum and extends out of the inner drum. A blocking member is fixedly arranged in the dryer, and the protruding member can abut against the blocking member under the drive of the inner drum, so that the protruding member drives the impact block to compress the spring member in a direction away from the piezoelectric material after being blocked.

[0011] In a preferred technical solution of the above-mentioned clothes dryer, the clothes dryer further comprises lifting ribs, the lifting ribs are arranged in the inner drum, the lifting ribs are arranged with insulating material, and the metal plate is arranged on the outer surface of the lifting ribs.

[0012] In the preferred technical solution of the above-mentioned clothes dryer, a containing cavity is provided in the lifting rib, and the self-generating device, the sensor and the signal transmitting module are arranged in the containing cavity.

[0013] In the preferred technical solution of the above clothes dryer, the metal plate is provided with a bent edge, the lifting rib is provided with a plug-in hole, and the bent edge is plugged into the plug-in hole.

[0014] In the preferred technical solution of the above-mentioned clothes dryer, the signal transmitting module is a Bluetooth module or a WIFI module.

[0015] In the case of adopting the above technical solution, the present invention can more accurately judge the dryness of the clothes in the inner drum by arranging a metal plate in the inner drum and detecting the capacitance between the metal plate and the inner drum by a sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is a side sectional view of a first structure of a clothes dryer of the present invention;

[0018] Figure 2 is a front cross-sectional view of the clothes dryer of the present invention using the first lifting rib structure;

[0019] Figure 3 is a front cross-sectional view of the clothes dryer of the present invention using the second lifting rib structure;

[0020] Figure 4 is a schematic diagram of a lifting rib of a clothes dryer of the present invention;

[0021] Figure 5 The present invention is a case where the self-generating device uses the principle of cutting magnetic flux lines to generate electricity. Figure 4 The cross-sectional view at AA in FIG.

[0022] Figure 6 The present invention is the case where the self-generating device uses the piezoelectric principle to generate electricity Figure 4 Cross-sectional view at AA in .

[0023] List of reference numerals:

[0024] 1. Clothes dryer; 10. Inner drum; 11. Lifting ribs; 111. Accommodating cavity; 112. Plug hole; 12. Circuit board; 121. Wire; 13. Sensor; 131. Sensing line; 14. Signal transmitting module; 15. Power storage module; 16. Self-generating device; 161. Sleeve; 1611. Piezoelectric ceramic; 1612. Spring member; 1613. Impact block; 1614. Protruding member; 162. Coil bracket; 1621. Hollow channel; 1622. Upper cover; 1623. Lower cover; 163. Coil; 164. Iron core; 17. Metal plate; 171. Bending edge; 18. Magnetic group; 19. Blocking part; 20. Signal receiving module. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0026] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] It should be noted that piezoelectric materials refer to materials with piezoelectric effect. Piezoelectric materials can generate electric current under the action of external force. Piezoelectric materials include single crystal materials, piezoelectric ceramics and high molecular polymers. For the convenience of description, the piezoelectric materials in the following text are introduced using piezoelectric ceramics as an example.

[0029] In addition, for the convenience of introduction, the following is an example in which the metal plate 17 is disposed on the lifting rib 11 and the self-generating device 16 , the sensor 13 and the signal transmitting module 14 are disposed in the lifting rib 11 .

[0030] like Figure 1-6 As shown, in order to solve the problem of poor reliability of the sensor in the dryer in the prior art in detecting the drying state of clothes, as shown in FIG. Figure 1 , 2 As shown in Figures 3 and 4, the clothes dryer 1 of the present invention comprises an inner drum 10, a lifting rib 11 is arranged in the inner drum 10, a receiving chamber 111 is arranged in the lifting rib 11, a self-generating device 16, a sensor 13 and a signal transmitting module 14 are arranged in the receiving chamber 111, the self-generating device 16 can supply power to the sensor 13 and the signal transmitting module 14, preferably, a power storage module 15 is also arranged in the receiving chamber 111, the power storage module 15 is connected to the self-generating device 16, the sensor 13 and the signal transmitting module 14, and the self-generating device 16 can also charge the power storage module 15. A metal plate 17 is arranged on the outer surface of the lifting rib 11, the metal plate 17 is electrically connected to the sensor 13, the inner drum 10 is made of metal, the sensor 13 can be connected to the metal plate 17 through a sensing line 131, and the sensor 13 is used to detect the capacitance between the metal plate 17 and the inner drum 10. In order to reduce the usage space of the accommodating cavity 111 , a circuit board 12 may be disposed in the accommodating cavity 111 . The circuit board 12 is connected to the signal transmitting module 14 , the power storage module 15 and the sensor 13 via a wire 121 .

[0031] In the prior art, a temperature sensor 13 or a resistance sensor 13 is usually used to detect relevant parameters in the dryer 1 to determine whether the clothes are completely dried. However, when the temperature sensor 13 is used, the temperature sensor 13 is generally used to detect the temperature at the outlet of the inner drum 10. When the temperature is greater than the set temperature, the drying is terminated. In the case where the wet clothes are wrapped by dry clothes, the temperature at the outlet of the inner drum 10 can also reach the preset temperature. At this time, the dryer 1 will still end the drying according to the detected temperature, which seriously affects the user experience. When the resistance sensor 13 is used, it is necessary to detect the resistance of the clothes when they fall on the electrode to determine the degree of drying of the clothes. However, this method lacks consistency. When the clothes are only partially dry, if the clothes falling on the electrode are just dry, then it will be determined that the clothes are dry and the drying is terminated. The above judgment method will also cause the dryer to stop running when the clothes are not completely dried. To solve the above problems, the present invention provides a new solution. The clothes dryer 1 of the present invention is provided with a metal plate 17 on the lifting rib 11 of the inner drum 10, and the capacitance between the metal plate 17 and the metal inner drum 10 is detected by the sensor 13. Since the capacitance between the metal plate 17 and the metal inner drum 10 is only related to the facing area, the distance between the plates and the dielectric constant between the two, and since the metal plate 17 is fixedly arranged on the lifting rib 11, and the lifting rib 11 is fixedly arranged on the inner drum 10, the facing area and the distance between the metal plate 17 and the inner drum 10 remain unchanged. Therefore, since the capacitance between the metal plate 17 and the metal inner drum 10 is affected by the dielectric constant, when the air between the metal plate 17 and the metal inner drum 10 is relatively humid air, the measured capacitance may decrease. When the clothes are in a wet state, the wet clothes overlap the inner drum 10 and the metal plate 17. At this time, the wet clothes can conduct electricity, so in this case, the capacitance value cannot be detected. When the clothes are completely dried, since dry clothes are generally non-conductive, even if the clothes are overlapped between the metal plate 17 and the metal inner drum 10, the capacitance between the metal plate 17 and the metal inner drum 10 can be detected. When the drying is basically complete, the air humidity in the inner drum 10 will decrease, and accordingly, the measured capacitance value will increase. After the capacitance between the metal plate 17 and the metal inner drum 10 can be detected and the capacitance value reaches the set value, it is considered that the clothes have been completely dried, and the drying process can be ended at this time. The present invention can more accurately detect whether the clothes have been completely dried.

[0032] The present invention detects the capacitance between the metal plate 17 and the metal inner drum 10 through the sensor 13, and transmits the detection data or the processed conclusion data outward through the signal transmitting module 14 and receives it through the signal receiving module 20. The dryer 1 can choose to continue the drying mode or end the drying mode according to the received data.

[0033] The present invention arranges the sensor 13, the signal transmitting module 14 and the self-generating device 16 in the lifting rib 11, which can not only make full use of the space in the lifting rib 11, but also prevent the sensor 13, the signal transmitting module 14 and the self-generating device 16 from entering water during the movement of the inner drum 10. In addition, by connecting the self-generating device 16 with the signal transmitting module 14 and the sensor 13, electric energy can be saved and the safety of the line connection can be ensured. In addition, the self-generating device 16 is arranged in the lifting rib 11 to supply power to the sensor 13 and the signal transmitting module 14, thereby reducing the energy consumption of the dryer 1, and at the same time, it can also reduce the space occupied by the above-mentioned connecting line in the dryer 1.

[0034] like Figure 1 , 2 As shown in , 5, the self-generating device 16 may include a coil support 162, a coil 163 and an iron core 164 arranged in the accommodating chamber 111, a hollow channel 1621 is arranged in the coil support 162, the iron core 164 is arranged in the hollow channel 1621, the coil 163 is wound on the coil support 162, and a magnetic group 18 is also fixedly arranged in the dryer 1, so that the coil 163 cuts the magnetic flux lines under the drive of the inner drum 10. In order to ensure the stability of the installation of the coil support 162 and the iron core 164, an upper cover 1622 may be arranged on the top between the coil 163, a lower cover 1623 may be arranged at the bottom of the coil support 162, the iron core 164 is arranged in the hollow channel 1621 between the upper cover 1622 and the lower cover 1623, and the lower cover 1623 is fixed in the lifting rib 11. Of course, the self-generating device 16 may also be set to other structures, such as Figure 3 , 6 As shown, the self-generating device 16 comprises a sleeve 161 disposed in the accommodating cavity 111, and a piezoelectric material (hereinafter, a piezoelectric ceramic 1611 is used as an example for description), an impact block 1613 and a spring member 1612 are disposed in the sleeve 161. The impact block 1613 is disposed between the spring member 1612 and the piezoelectric ceramic 1611, and the impact block 1613 impacts the piezoelectric ceramic 1611 under the elastic force of the spring member 1612 to generate electricity. A protruding member 1614 is also disposed on the impact block 1613, and the protruding member 1614 passes through the sleeve 161 and the inner drum 10 and protrudes out of the inner drum 10. A blocking member 19 is fixedly disposed in the dryer 1, and the protruding member 1614 can abut against the blocking member 19 under the drive of the inner drum 10, so that the protruding member 1614 drives the impact block 1613 to compress the spring member 1612 in a direction away from the piezoelectric material after being blocked.

[0035] When the self-generating device 16 is a device including a coil 163 and an iron core 164, a magnetic group 18 needs to be arranged in the clothes dryer 1. Figure 1 , 2As shown, preferably, the magnetic group 18 is arranged on the outer cylinder (not shown in the figure), when the inner cylinder 10 rotates in the outer cylinder, the lifting rib 11 on the inner cylinder 10 rotates with the inner cylinder 10, and at the same time, the coil 163 and the iron core 164 in the lifting rib 11 rotate with the lifting rib 11, and the coil 163 is a closed coil 163. When the coil 163 and the iron core 164 pass over the magnetic group 18 during the rotation, the closed coil 163 will cut the magnetic flux lines of the magnetic group 18, thereby generating electricity, and then providing electrical energy for the sensor 13 and the signal transmitting module 14. The principle of the closed coil 163 cutting the magnetic flux lines is used to realize self- Power generation achieves the effect of energy conservation and emission reduction. In addition, in the closed loop connected by the sensor 13, the signal transmitting module 14 and the self-generating device 16, the power storage module 15 can also be connected. When the self-generating device 16 generates electricity, it can provide power to the sensor 13 and the signal transmitting module 14 while also charging the power storage module 15. When the self-generating device 16 no longer generates electricity, the electric energy stored in the power storage module 15 can be used to provide energy to the sensor 13 and the signal transmitting module 14, thereby ensuring the continuity and stability of the operation of the sensor 13 and the signal transmitting module 14 and avoiding energy waste.

[0036] When the self-generating device 16 includes a sleeve 161 arranged in the accommodating cavity 111, and a piezoelectric ceramic 1611, an impact block 1613 and a spring member 1612 are arranged in the sleeve 161, preferably, a blocking member 19 can be correspondingly arranged in the outer cylinder, and the blocking member 19 can block the movement of the protruding member 1614. Since the piezoelectric ceramic 1611 can only generate electrical energy once under continuous pressure and cannot generate electricity continuously, it is necessary to repeatedly apply pressure to the piezoelectric ceramic 1611. When the inner cylinder 10 rotates, the lifting rib 11 on the inner cylinder 10 can rotate with the inner cylinder 10, and accordingly, the sleeve 161 in the lifting rib 11 will also rotate accordingly. At this time, since the spring member 1612 in the lifting rib 11 is in a compressed state, the impact block 1613 will move toward the direction of the piezoelectric ceramic 1611 under the elastic force of the spring member 1612, thereby applying a certain force to the piezoelectric ceramic 1611, and the piezoelectric ceramic 1611 will be moved under the action of the force. Mechanical energy is converted into electrical energy, and power is also supplied to the sensor 13 and the signal transmitting module, thereby ensuring that the sensor 13 and the signal transmitting module can operate stably and saving energy. When the lifting rib 11 moves to the position of the corresponding blocking member 19, as the inner cylinder 10 continues to rotate, the protruding member 1614 gradually contacts the blocking member 19. Under the pressure of the blocking member 19, the protruding member 1614 drives the impact block 1613 to move in the direction of the compressed spring member 1612. At this time, the impact block 1613 compresses the spring member 1612 and separates from the piezoelectric ceramic 1611, thereby stopping the piezoelectric ceramic 1611 from generating electricity. After the protruding member 1614 moves away from the blocking member 19 during the rotation of the inner cylinder 10, the impact block 1613 continues to compress the piezoelectric ceramic 1611 under the pressure of the spring member 1612 to generate electricity. Through the above implementation, it can be ensured that the impact block 1613 generates electricity when repeatedly impacting the piezoelectric ceramic 1611. In addition, in the closed loop connected by the sensor 13, the signal transmitting module 14, and the self-generating device 16, the power storage module 15 can also be connected. When the piezoelectric ceramic 1611 generates electricity, it can provide electrical energy to the sensor 13 and the signal transmitting module 14 while also charging the power storage module 15. When the piezoelectric ceramic 1611 no longer generates electricity, the electrical energy stored in the power storage module 15 can be used to provide energy to the sensor 13 and the signal transmitting module 14, thereby ensuring the continuity and stability of the operation of the sensor 13 and the signal transmitting module 14.

[0037] It should be noted that, in order to ensure the continuous rotation of the inner cylinder 10 and prevent the blocking member 19 from blocking the movement of the inner cylinder 10 after blocking the protruding member 1614, either the blocking member 19 or the protruding member 1614 can be set as an elastic body, and when the protruding member 1614 contacts the blocking member 19, elastic deformation occurs, while ensuring that the protruding member 1614 can drive the impact block 1613 to compress the spring and stay away from the piezoelectric ceramic 1611, the inner cylinder 10 can also be stably rotated. Of course, the above is not a limitation and can also be set according to the needs of technicians in this field. In addition, the magnetic group 18 can be set not only on the outer cylinder, but also on the base, air duct or housing, as long as the closed coil can cut the magnetic flux lines during the movement. Therefore, the above are all within the protection scope of the present invention.

[0038] It should also be noted that, in order to ensure that the sensor 13 can measure the capacitance between the metal plate 17 and the inner tube 10 , the metal plate 17 and the inner tube 10 cannot be connected by a conductive material, so the lifting rib 11 can be set to be an insulating material.

[0039] In addition, the above is introduced by taking the example of setting the metal plate 17 on the lifting rib 11. Of course, the metal plate 17 can also be directly set in the inner tube 10 through other insulating materials, without being directly set on the lifting rib 11. The sensor 13 connected to the metal plate 17 can be powered by the power storage module 15 or other power supply devices or the self-generating device 16, so as to ensure that the sensor 13 can accurately detect the capacitance between the metal plate 17 and the metal inner tube 10. At the same time, the power storage module 15 or the self-generating device 16 does not have to be installed in the lifting rib 11. Therefore, the above is not restrictive and can be set according to the needs of technical personnel in this field. The above are all within the protection scope of the present invention.

[0040] In order to facilitate the installation of the metal plate 17 on the lifting rib 11, a bent edge 171 can be provided on the metal plate 17, and a plug hole 112 is provided on the lifting rib 11, and the bent edge 171 is plugged into the plug hole 112. The outer periphery of the metal plate 17 is provided with a bent edge 171, and the plug hole 112 is provided on the lifting rib 11. The metal plate 17 is inserted into the plug hole 112 through the bent edge 171. In addition, the bent edge 171 can be as follows Figure 5 , 6 The L-shaped bend shown in the figure, at this time, the L-shaped bend can clamp the corresponding position of the lifting rib 11 in the bend. Of course, the bending edge 171 can also be set to other bending structures, such as a U-shaped bend, as long as the bending edge 171 can ensure that the metal plate 17 is stably fixed on the lifting rib 11 after being inserted into the plug hole 112 of the lifting rib 11.

[0041] It should also be noted that the method of setting the metal plate 17 on the lifting rib 11 by plugging is not restrictive. The metal plate 17 can also be directly injection molded as one piece with the lifting rib 11, or the metal plate 17 can be connected to the lifting rib 11 by bolts. It can also be set according to the needs of technical personnel in this field. All of the above are within the protection scope of the present invention.

[0042] Preferably, the signal transmitting module 14 can be set as a Bluetooth module or a WIFI module. The wireless transmission of the signal is realized by the Bluetooth mode, and the signal transmission can be realized without the signal transmitting module 14 and the signal receiving module 20 being directly opposite, so that the position where the signal transmitting module 14 and the signal receiving module 20 are set is relatively unrestricted, and the position where the setting is more flexible and more selective. Similarly, the transmission mode of the signal is transmitted by the WIFI module, and the signal transmission can be realized without the signal transmitting module 14 and the signal receiving module 20 being directly opposite, and the distance setting range of the signal transmitting module 14 and the signal receiving module 20 can be larger, so that the position where the signal transmitting module 14 and the signal receiving module 20 are set is relatively unrestricted, and the position where the setting is more flexible and more selective. Of course, the above is not restrictive, and the mode of the signal transmitting module 14 can be selected and set according to the needs of those skilled in the art, therefore, all of the above are within the protection scope of the present invention.

[0043] In summary, the present invention detects the capacitance between the metal plate 17 and the metal inner drum 10 by arranging the metal plate 17 on the lifting rib 11. Since the capacitance between the metal plate 17 and the metal inner drum 10 is only related to the facing area, the distance between the plates and the dielectric constant, and since the metal plate 17 is fixedly arranged on the lifting rib 11 and the lifting rib 11 is fixedly arranged on the inner drum 10, the facing area and the distance between the plates between the metal plate 17 and the inner drum 10 remain unchanged. Therefore, since the capacitance between the metal plate 17 and the metal inner drum 10 is affected by the dielectric constant, when the air between the metal plate 17 and the metal inner drum 10 is relatively humid air, the measured capacitance may decrease. When the clothes are in a wet state, the wet clothes overlap the inner drum 10 and the metal plate 17. At this time, the wet clothes can conduct electricity. Therefore, in this case, the capacitance value cannot be detected. When the clothes are completely dried, since dry clothes are generally not conductive, even if the clothes overlap between the metal plate 17 and the metal inner drum 10, the capacitance between the metal plate 17 and the metal inner drum 10 can be detected. When the drying is basically complete, the air humidity in the inner drum 10 will decrease, and accordingly, the measured capacitance value will increase. After the capacitance between the metal plate 17 and the metal inner drum 10 is detected and the capacitance value reaches the set value, it is considered that the clothes have been completely dried, and the drying process can be ended at this time. The present invention can more accurately detect whether the clothes have been completely dried.

[0044] In addition, the clothes dryer 1 of the present invention further includes a device capable of receiving a signal transmitted by the signal transmitting module 14, so as to further determine whether to continue to execute the drying mode according to the received signal.

[0045] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A clothes dryer, characterized in that: The clothes dryer includes an inner drum, in which a metal plate, a sensor and a signal transmitting module are arranged, the metal plate is connected to the inner drum through an insulating member, the metal plate is electrically connected to the sensor and the signal transmitting module, the inner drum is set to be made of metal, and the sensor is used to detect the capacitance between the metal plate and the inner drum.

2. The clothes dryer according to claim 1, characterized in that: The clothes dryer further includes a power storage module, and the power storage module is used to supply power to the sensor.

3. The clothes dryer according to claim 1 or 2, characterized in that: The clothes dryer further comprises a self-generating device, which is disposed on the inner drum and connected to the sensor and the signal transmitting module, and can supply power to the sensor and the signal transmitting module.

4. The clothes dryer according to claim 2, characterized in that: A circuit board is also provided in the clothes dryer, and the circuit board is connected to the signal transmitting module, the power storage module and the sensor through wires.

5. The clothes dryer according to claim 3, characterized in that: The self-generating device includes a coil support, a coil and an iron core. The coil is arranged on the inner cylinder, a hollow channel is arranged in the coil support, the iron core is arranged in the hollow channel, the coil is wound on the coil support, and a magnetic group is fixedly arranged in the dryer so that the coil cuts the magnetic flux lines under the drive of the inner cylinder.

6. The clothes dryer according to claim 3, characterized in that: The self-generating device includes a sleeve and a piezoelectric material, an impact block and a spring member arranged in the sleeve. The impact block is arranged between the spring and the piezoelectric material. The impact block hits the piezoelectric material under the elastic force of the spring member to enable the piezoelectric material to generate electricity. The impact block is also provided with a protruding member, which passes through the sleeve and the inner drum and extends out of the inner drum. A blocking member is fixedly arranged in the dryer. The protruding member can abut against the blocking member under the drive of the inner drum, so that the protruding member drives the impact block to compress the spring member in a direction away from the piezoelectric material after being blocked.

7. The clothes dryer according to claim 3, characterized in that: The clothes dryer further comprises lifting ribs, wherein the lifting ribs are arranged in the inner drum, the lifting ribs are arranged with insulating material, and the metal plate is arranged on the outer surface of the lifting ribs.

8. The clothes dryer according to claim 7, characterized in that: An accommodating cavity is arranged in the lifting rib, and the self-generating device, the sensor and the signal transmitting module are arranged in the accommodating cavity.

9. The clothes dryer according to claim 7, characterized in that: The metal plate is provided with a bending edge, the lifting rib is provided with an inserting hole, and the bending edge is inserted into the inserting hole.

10. The clothes dryer according to claim 1, characterized in that The signal transmitting module is a Bluetooth module or a WIFI module.

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