Clothes dryer and method for controlling temperature in drum of clothes dryer

Abstract

The application discloses a clothes dryer and a temperature control method for a clothes dryer inlet cylinder, and belongs to the technical field of clothes dryer temperature control. The clothes dryer comprises a clothes drying cylinder, an air inlet duct, a heater and a thermostat. The clothes drying cylinder is used for accommodating clothes. One end of the air inlet duct is in communication with an air inlet of the clothes drying cylinder. The heater is arranged in the air inlet duct and is used for heating air flow in the air inlet duct. The thermostat is in communication connection with the heater and is used for controlling the opening and closing of the heater. The thermostat comprises a shell and a preheating structure arranged in the shell. The preheating structure is used for preheating air in the shell at the initial stage of starting the clothes dryer. The clothes dryer is provided with the preheating structure in the shell of the thermostat, so that the air in the shell can be preheated at the initial stage of starting the clothes dryer. Thus, the problem that the temperature of the air flow into the cylinder is too high due to the temperature lag of the thermostat in the cold state is solved, the clothes are prevented from being damaged due to the too high temperature of the air flow into the cylinder, and the clothes drying effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature control of a clothes dryer, and in particular to a clothes dryer and a method for controlling the temperature of the drum inlet of a clothes dryer. BACKGROUND

[0002] With the gradual improvement of people's living standards, clothes dryers are increasingly used in people's daily life. The drum inlet temperature of a clothes dryer (i.e. the temperature of the drum inlet airflow in the air inlet duct) is an important factor in determining the drying efficiency and drying effect of the clothes dryer. The drum inlet temperature is generally controlled by a thermostat installed near the heater. The thermostat is generally arranged near the heating wire of the heater, and the thermostat cuts off or starts the heater to indirectly control the drum inlet temperature to be below the deformation or damage temperature of the corresponding clothes material.

[0003] The existing heater temperature control has only one value, and the thermostat trip in a low temperature environment is affected by the ambient temperature and lags. The lower the ambient temperature, the longer the lag, which can cause the heater to be unable to be controlled by the thermostat to be cut off in a short time. The heater continues to heat during the lag of the thermostat, which causes the drum inlet temperature to continue to rise and even exceed the maximum bearing temperature of the clothes, causing the clothes to be damaged by high temperature. SUMMARY

[0004] An object of the present application is to provide a clothes dryer, wherein the thermostat of the clothes dryer can timely cut off the heater, the drum inlet temperature control is accurate, the drying effect of the clothes is good, and the clothes are not easily damaged during the drying process.

[0005] To achieve this object, the present application adopts the following technical solutions:

[0006] A clothes dryer, comprising: a drying drum for accommodating clothes; an air inlet duct, one end of the air inlet duct being in communication with an air inlet of the drying drum; a heater, the heater being arranged in the air inlet duct and being used for heating the drum inlet airflow in the air inlet duct; and a thermostat, the thermostat being communicatively connected with the heater and being used for controlling the opening and closing of the heater, the thermostat comprising a housing and a preheating structure arranged inside the housing, the preheating structure being used for preheating the air inside the housing at the initial stage of starting the clothes dryer.

[0007] Preferably, the preheating structure comprises a heating resistor, the heating resistor being configured to heat the air inside the housing when powered.

[0008] Preferably, a plurality of heating resistors are provided, the plurality of heating resistors have different resistance values, and the plurality of heating resistors are arranged in parallel. Each of the heating resistors is provided with a control switch for controlling the on-off of the branch.

[0009] As preferred, the heating resistances are provided in plurality, the plurality of the heating resistances are provided in series, and two ends of at least part of the heating resistances are each connected in parallel with a wire, each of the wires is provided with a control switch, and the control switches are closed to short-circuit the corresponding heating resistances.

[0010] As preferred, the first temperature detecting mechanism is arranged in the air inlet duct, the second temperature detecting mechanism is arranged in the shell, and the plurality of the control switches are configured to be selectively opened and closed according to a temperature difference between a first temperature detected by the first temperature detecting mechanism and a second temperature detected by the second temperature detecting mechanism.

[0011] As preferred, the clothes dryer further comprises an air outlet duct, a fan and an exhaust pipe, one end of the air outlet duct is communicated with an air outlet of the drying drum, the other end of the air outlet duct is communicated with an input end of the fan, and the exhaust pipe is communicated with an output end of the fan.

[0012] As preferred, the third temperature detecting mechanism is arranged in the air outlet duct and is configured to detect a temperature of the air flow in the air outlet duct, and the heater is configured to be closed when a third temperature detected by the third temperature detecting mechanism is higher than a set value in a later stage of the clothes drying program.

[0013] As preferred, the thermostat is a bimetallic strip thermostat.

[0014] Another object of the present application is to provide a clothes dryer air inlet temperature control method, which can timely cut off the heater by the thermostat, so that the air inlet temperature control is accurate, the clothes drying effect is good, and the clothes are not easily damaged in the drying process.

[0015] To achieve the above object, the present application adopts the following technical solutions:

[0016] A clothes dryer air inlet temperature control method comprises the following steps: starting a heater, the heater heats an air flow in an air inlet duct; starting a preheating structure of a thermostat; after the preheating structure works for a preset time, the preheating structure is closed; monitoring a temperature of the air flow, and after the temperature of the air flow is higher than a first preset value, the thermostat controls the heater to stop heating.

[0017] As preferred, the clothes dryer air inlet temperature control method further comprises the following steps: continuing to monitor the temperature of the air flow, and after the temperature of the air flow is lower than a second preset value, the thermostat controls the heater to continue heating.

[0018] The present application has the following beneficial effects:

[0019] The application provides a clothes dryer, which comprises a drying drum, an air inlet duct, a heater and a thermostat, the drying drum is used for accommodating clothes, one end of the air inlet duct is communicated with an air inlet of the drying drum, the heater is arranged in the air inlet duct and is used for heating an air flow in the air inlet duct, the thermostat is in communication connection with the heater and is used for controlling the opening and closing of the heater, and the thermostat comprises a shell and a preheating structure arranged in the shell, the preheating structure is used for preheating air in the shell at the initial stage of starting the clothes dryer, so that the temperature of the air in the shell is equal to the temperature of the air flow in the air inlet duct. The clothes dryer is provided with the preheating structure in the shell of the thermostat, the preheating structure can preheat the air in the shell at the initial stage of starting the clothes dryer, so that the working temperature in the thermostat is rapidly increased, the time required for heat transfer between the inside and outside of the thermostat is shortened, and the problem that the temperature of the air flow in the air inlet duct is too high due to the lag of the sensed temperature of the thermostat in the cold state in a low-temperature environment is solved, the clothes drying effect is improved, and the clothes are prevented from being damaged due to the too high temperature of the air flow in the air inlet duct. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 1 is a structural schematic view of the clothes dryer provided by the application;

[0021] Figure 2 Fig. 2 is a structural schematic view of the thermostat of the clothes dryer provided by the application;

[0022] Figure 3 Fig. 3 is a structural schematic view of the preheating structure of the thermostat provided by the first embodiment of the application;

[0023] Figure 4 Fig. 4 is a structural schematic view of the preheating structure of the thermostat provided by the second embodiment of the application;

[0024] Figure 5 Fig. 5 is a flow chart of the clothes dryer air inlet temperature control method provided by the third embodiment of the application.

[0025] In the drawings:

[0026] 1, drying drum; 2, air inlet duct; 3, heater;

[0027] 4, thermostat; 41, shell; 42, preheating structure; 421, heating resistor; 422, control switch; 5, high-temperature limiter; 6, air outlet duct; 7, fan; 8, exhaust pipe. DETAILED DESCRIPTION

[0028] The technical solutions of the application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or it can be detachable connection; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Embodiment one

[0032] The present embodiment provides a clothes dryer, which is used for drying clothes, so that users can quickly obtain dry clothes in bad weather such as plum rain weather or overcast weather, and the use of the clothes dryer can improve the user's life experience. Since the clothes dryer uses high-temperature gas to take away the moisture on the clothes to achieve the purpose of drying the clothes, the specific temperature of the high-temperature gas is the main factor determining the drying effect of the clothes. If the temperature is too high, it may cause damage to the clothes, especially for clothes made of materials that are sensitive to temperature (such as silk), and high temperature will cause irreparable damage to the clothes.

[0033] As shown in Figure 1 In the present embodiment, the clothes dryer includes a drying drum 1, an air inlet duct 2, a heater 3 and a thermostat 4. The drying drum 1 is used to accommodate clothes, which is driven to rotate by a power mechanism of the clothes dryer, and the power mechanism is a servo motor. One end of the air inlet duct 2 is in communication with the air inlet of the drying drum 1, and the other end is in communication with the external environment, so that the air in the external environment can enter the drying drum 1 through the air inlet duct 2. The heater 3 is arranged in the air inlet duct 2 and is used to heat the air, so as to form an air flow with a certain temperature in the air inlet duct 2, which can dry the clothes after entering the drying drum 1. The thermostat 4 is in communication connection with the heater 3, which is used to control the opening and closing of the heater 3, so as to control the heating time of the heater 3, and further control the temperature of the air flow. Continue to refer to Figure 1As shown, the dryer also includes a high-temperature limiter 5, an air outlet duct 6, a fan 7, and an exhaust pipe 8. The high-temperature limiter 5 is installed on the heater 3 to prevent the heater 3 from overheating. One end of the air outlet duct 6 is connected to the air outlet of the drying drum 1, and the other end is connected to the input end of the fan 7. The exhaust pipe 8 is connected to the output end of the fan 7.

[0034] like Figure 2 As shown, the thermostat 4 includes a housing 41 and a preheating structure 42 disposed inside the housing 41. The preheating structure 42 is used to preheat the air inside the housing 41 at the initial stage of the dryer's startup, so that the air temperature inside the housing 41 rises rapidly, shortening the time required for the operating temperature inside the thermostat 4 to reach the trip value for the first time at the initial stage of the dryer's startup, thereby preventing the heater 3 from heating for too long and causing the temperature of the airflow into the drum to be too high. Optionally, in this embodiment, the thermostat 4 is a bimetallic thermostat with an internal preheating structure 42. Apart from the preheating structure 42, other structures of the bimetallic thermostat are existing technologies and will not be described in detail here.

[0035] By observing the temperature change curves of the inlet airflow after the existing dryer thermostat is set to a single temperature value at ambient temperature or low temperature during startup, it can be seen that a significant high-temperature peak occurs in the inlet airflow temperature during the first few minutes after the dryer starts. This high-temperature peak occurs because, in a cold state, the bimetallic thermostat, limited by its mechanical bimetallic strip operating principle, requires heat transfer through the thermostat's shell to raise the temperature of the bimetallic strip. This results in a slower temperature rise inside the bimetallic thermostat during the initial startup phase, failing to promptly reflect the temperature within the air inlet duct. Furthermore, the lower the ambient temperature, the longer the temperature transfer time from the outside to the inside of the bimetallic thermostat, causing a further lag in temperature sensing. Consequently, even when the inlet airflow temperature in the air inlet duct has reached the preset value, the bimetallic thermostat cannot cut off the heater in time, allowing the heater to heat for an even longer period, leading to a continuous rise in the inlet airflow temperature. Finally, when the internal operating temperature of the bimetallic thermostat reaches the trip value, the inlet airflow temperature in the air inlet duct is already far higher than the preset value.

[0036] The clothes dryer provided in the embodiment can heat the air inside the thermostat 4 shell 41 in the initial stage of the clothes dryer starting by setting the preheating structure 42 in the thermostat 4, so that the working temperature of the bimetallic strip in the thermostat 4 can quickly rise, thereby shortening the time required for the working temperature in the thermostat 4 to reach the trip value for the first time in the initial stage of the clothes dryer starting, making up for the time wasted in the heat transfer between the inside and outside of the thermostat 4 shell 41, thereby solving the problem of excessively high air flow temperature into the drum caused by the temperature lag of the thermostat 4 in the cold state. The clothes dryer can accurately control the disconnection of the heater 3 by using the thermostat 4 with the preheating structure 41, so that the temperature of the air flow into the drum will not be higher than the preset value, avoiding damage to clothes caused by excessively high air flow into the drum, achieving good clothes drying effect, and improving the user experience.

[0037] Optionally, continuing to refer to Figure 1 As shown in the figure, the preheating structure 42 includes a heating resistor 421, and the two ends of the heating resistor 421 are connected to an external power supply through wires. When the clothes dryer starts, the control system of the clothes dryer controls the heating resistor 421 to be powered on, and the heating resistor 421 generates heat to preheat the air inside the shell 41, thereby reducing the time required for the thermostat 4 to reach the trip value for the first time, and cutting off the heater 3 before the temperature of the air flow into the drum exceeds the maximum limit value. After the heating resistor 421 works for a period of time, the temperature inside the thermostat 4 can more closely reflect the temperature of the air flow into the drum, and then the control system controls the heating resistor 421 to be powered off, so that the heating resistor 421 stops heating, and finally the purpose of eliminating the first peak value of the temperature of the air flow into the drum is achieved.

[0038] In the embodiment, the control system of the clothes dryer can be a centralized or distributed controller. For example, the controller can be a single microcontroller or a plurality of microcontrollers distributed in multiple blocks. The microcontroller can run a control program to control the components of the clothes dryer to achieve their functions.

[0039] Because the clothes dryer is used in different places, the ambient temperature of the clothes dryer also varies greatly. The lower the ambient temperature, the more serious the temperature lag problem of the thermostat 4, and the longer the time required for heat transfer between the inside and outside of the thermostat 4. In order to flexibly adjust the heating rate inside the thermostat 4 according to the change of the ambient temperature, so that the working temperature inside the thermostat 4 can be increased to the target value within a preset time period regardless of the ambient temperature, such as Figure 2 As shown in the figure, a plurality of heating resistors 421 can be provided, the resistance values of the plurality of heating resistors 421 are different, and the plurality of heating resistors 421 are connected in parallel. A control switch 422 for controlling the branch is arranged on each branch of the heating resistors 421. Figure 2As shown, three heating resistors 421 are provided, and correspondingly, three control switches 422 are provided.

[0040] When the ambient temperature is low, the branch with the heating resistor 421 having a larger control resistance value is selected to be connected, and other branches are disconnected, so that the preheating structure 42 generates more heat in the same time. When the ambient temperature is relatively high but still belongs to low temperature, the branch with the heating resistor 421 having a smaller control resistance value is selected to be connected, and other branches are disconnected, so that the preheating structure 42 generates relatively less heat in the same time. Of course, in use, the branches with multiple heating resistors 421 can be selected to be connected at the same time, so as to further improve the use flexibility of the preheating structure 42.

[0041] In order to more accurately obtain the specific value of the internal working temperature of the thermostat 4, so as to improve the control accuracy of the preheating structure 42. A first temperature detection mechanism is arranged in the air inlet duct 2, and a second temperature detection mechanism is arranged in the shell 41, and the multiple control switches 422 can be selectively opened and closed according to the temperature difference between the first temperature detected by the first temperature detection mechanism and the second temperature detected by the second temperature detection mechanism. Optionally, the first temperature detection mechanism and the second temperature detection mechanism are both temperature sensors.

[0042] For example, at the initial stage of starting the clothes dryer, when the temperature difference between the first temperature and the second temperature is large, the control switch 422 of the branch with the heating resistor 421 having a larger control resistance value is selected to be connected; and when the temperature difference between the first temperature and the second temperature is small, the control switch 422 of the branch with the heating resistor 421 having a smaller control resistance value is selected to be connected.

[0043] Further, a third temperature detection mechanism is arranged in the air outlet duct 6, and the third temperature detection mechanism is used to detect the temperature of the out-cylinder airflow in the air outlet duct 6. If the third temperature detected by the third temperature detection mechanism is higher than a set value at the later stage of the drying program, the heater 3 is turned off. Optionally, the third temperature detection mechanism is a temperature sensor.

[0044] Since the temperature of the out-cylinder airflow can reflect the temperature in the drying drum 1, by detecting the temperature of the out-cylinder airflow by using the third temperature detection mechanism, it can be avoided that the temperature in the drying drum 1 is too high after the drying is completed, so as to avoid scalding the user when the user opens the drying drum 1 to take out the clothes.

[0045] Embodiment Two

[0046] On the basis of the first embodiment, the clothes dryer provided in the present embodiment is basically the same as the clothes dryer in the first embodiment, and the only difference is the preheating structure 42.

[0047] As shown in the drawings, Figure 4As shown, in the embodiment, the preheating structure 42 comprises a plurality of heating resistors 421, the plurality of heating resistors 421 are arranged in series, and both ends of at least part of the heating resistors 421 are connected in parallel with a wire, each of the wires is provided with a control switch 422, and the control switch 422 is closed to short-circuit the corresponding heating resistor 421. In the embodiment, there are three heating resistors 421, two of which are connected in parallel with a short-circuit branch, and the remaining one heating resistor 421 is not connected in parallel with a short-circuit branch to avoid the phenomenon of the overall short-circuit of the preheating structure 42 caused by the short-circuit of all the heating resistors 421.

[0048] When the ambient temperature is low, the control switch 422 connected in parallel with the heating resistor 421 with a small resistance value is turned on to short-circuit the heating resistor 421 with a small resistance value, and only the heating resistor 421 with a large resistance value is left, so that the preheating structure 42 generates more heat in the same time. When the ambient temperature is relatively high but still belongs to low temperature, the control switch 422 connected in parallel with the heating resistor 421 with a large resistance value is turned on to short-circuit the heating resistor 421 with a large resistance value, and only the heating resistor 421 with a small resistance value is left, so that the preheating structure 42 generates relatively less heat in the same time. Of course, in use, one or more control switches 422 can be turned on according to the needs to short-circuit a certain number of heating resistors 421, further improving the use flexibility of the preheating structure 42.

[0049] Optionally, the resistance values of the plurality of heating resistors 421 can be the same or different, which is not specifically limited here.

[0050] Embodiment Three

[0051] Based on the embodiments one and two, the embodiment provides a drying machine drum inlet temperature control method, as shown in the figure, the drying machine drum inlet temperature control method comprises the following steps: Figure 5 As shown, the drying machine drum inlet temperature control method comprises the following steps:

[0052] Starting the heater 3, the heater 3 heats the drum inlet airflow in the air inlet duct 2;

[0053] Starting the preheating structure 42 of the thermostat 4;

[0054] After the preheating structure 42 works for a preset time, the preheating structure 42 is turned off;

[0055] Monitoring the temperature of the drum inlet airflow, and after the temperature of the drum inlet airflow is higher than a first preset value, the thermostat 4 controls the heater 3 to stop heating.

[0056] The control method can accurately control the temperature of the air flow into the drying drum, and when the temperature of the air flow into the drying drum reaches the first preset value, the thermostat 4 can timely cut off the heater 3, so as to avoid the temperature of the air flow into the drying drum exceeding the highest limit value due to the continuous heating of the heater 3, thereby avoiding the phenomenon of clothes being damaged by high temperature.

[0057] Further, the temperature control method of the drying drum further comprises the following steps:

[0058] The temperature of the air flow into the drying drum is continuously monitored, and when the temperature of the air flow into the drying drum is lower than the second preset value, the heater 3 continues to heat.

[0059] When the temperature of the air flow into the drying drum is higher than the first preset value, the temperature inside the thermostat 4 can quickly reach the jump-off value, at which time the thermostat 4 cuts off the heater 3; subsequently, the temperature of the air flow into the drying drum gradually decreases, and when the temperature of the air flow into the drying drum decreases to the second preset value, the thermostat 4 recovers (at this time, the temperature value inside the thermostat 4 is the recovery temperature value), and the heater 3 continues to heat. Since the recovery temperature value is much higher than the ambient temperature, when the thermostat 4 recovers and the heater 3 starts to heat, the delay of the sensing temperature of the thermostat 4 will be greatly shortened, and even if the preheating structure 42 is not started in the subsequent drying process of the drying machine, the thermostat 4 can quickly cut off the heater 3 when the temperature of the air flow into the drying drum reaches the first preset value again, so that the temperature of the air flow into the drying drum will not further increase.

[0060] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation modes are not required or can not be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A method of controlling the temperature of a drying machine drum, characterized in that, The clothes dryer comprises: a drying drum (1) for accommodating clothes; an air inlet duct (2) having one end in communication with an air inlet of the drying drum (1); a heater (3) arranged in the air inlet duct (2) and used for heating an air flow in the air inlet duct (2); a thermostat (4) in communication connection with the heater (3) and used for controlling the opening and closing of the heater (3), the thermostat (4) comprising a shell (41) and a preheating structure (42) arranged inside the shell (41), the preheating structure (42) being used for preheating air inside the shell (41) at an initial stage of starting the clothes dryer, so that the temperature of the air inside the shell (41) is equal to the temperature of the air flow in the air inlet duct (2). The clothes dryer inlet temperature control method comprises the following steps: starting the heater (3) to heat the air flow in the air inlet duct (2); starting the preheating structure (42) of the thermostat (4); after the preheating structure (42) works for a preset time, the preheating structure (42) is closed; monitoring the temperature of the air flow, and after the temperature of the air flow is higher than a first preset value, the thermostat (4) controls the heater (3) to stop heating; and further comprising the following steps: continuing to monitor the temperature of the air flow, and after the temperature of the air flow is lower than a second preset value, the heater (3) continues to heat.

2. The clothes dryer inlet temperature control method according to claim 1, wherein the preheating structure (42) comprises a heating resistor (421) configured to heat the air inside the shell (41) when powered.

3. The clothes dryer inlet temperature control method according to claim 2, wherein the heating resistor (421) is provided in multiple, the multiple heating resistors (421) have different resistance values, and the multiple heating resistors (421) are arranged in parallel, and each of the heating resistors (421) is provided with a control switch (422) on a branch for controlling the opening and closing of the branch.

4. The clothes dryer inlet temperature control method according to claim 2, wherein the heating resistor (421) is provided in multiple, the multiple heating resistors (421) are arranged in series, and at least part of the heating resistors (421) are each connected in parallel with a wire at both ends, and each of the wires is provided with a control switch (422), and when the control switch (422) is closed, the wire will short-circuit the corresponding heating resistor (421).

5. The clothes dryer inlet temperature control method according to claim 3 or 4, wherein a first temperature detection mechanism is arranged in the air inlet duct (2), a second temperature detection mechanism is arranged inside the shell (41), and the multiple control switches (422) are configured to selectively open and close according to the temperature difference between a first temperature detected by the first temperature detection mechanism and a second temperature detected by the second temperature detection mechanism.

6. The temperature control method of the dryer drum according to claim 1, characterized in that, The dryer further comprises an air outlet duct (6), a fan (7) and an exhaust pipe (8), one end of the air outlet duct (6) is in communication with the air outlet of the dryer drum (1), the other end is in communication with the input end of the fan (7), and the exhaust pipe (8) is in communication with the output end of the fan (7).

7. The temperature control method of the dryer drum according to claim 6, characterized in that, A third temperature detection mechanism is arranged in the air outlet duct (6), the third temperature detection mechanism is used to detect the temperature of the air flow in the air outlet duct (6), and when the third temperature detected by the third temperature detection mechanism is higher than the set value in the later stage of the drying program, the heater (3) is configured to be closed.

8. The temperature control method of the dryer drum according to claim 1, characterized in that, The thermostat (4) is a bimetallic strip thermostat.

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