Heat pump clothes dryer and control method thereof

Abstract

The invention relates to the technical field of drying, in particular to a heat pump clothes dryer and a control method thereof, and aims to solve the problem of low utilization efficiency of an auxiliary heating module due to the fact that the auxiliary heating module is placed at a hot air inlet of a roller of an existing roller type heat pump clothes dryer to increase the temperature of hot air entering the roller. In order to achieve the purpose, the heat pump clothes dryer comprises an inner barrel, a heat pump clothes drying assembly and a heating assembly, the heating assembly is arranged on the barrel wall of the inner barrel, and the control method comprises the steps that a control instruction is obtained, and the control instruction comprises a target drying mode; obtaining a clothing material; determining a target clothes drying temperature of the drum wall according to the control instruction and the clothes material; the current clothes drying temperature of the cylinder wall is obtained; and the heating power of the heating assembly is adjusted according to the target clothes drying temperature and the current clothes drying temperature, so that the cylinder wall is at the target clothes drying temperature. In this way, the risk of damaging the clothes can be reduced, meanwhile, the clothes in the inner barrel can be heated more evenly, and the drying efficiency of the heat pump clothes dryer is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drying, and in particular provides a heat pump clothes dryer and a control method thereof. Background Art

[0002] Existing drum-type heat pump dryers place an auxiliary heating module at the hot air inlet of the drum to increase the temperature of the hot air entering the drum to achieve rapid drying. However, the hot air entering the drum does not act evenly on the wet clothes. A part of the hot air directly passes through the drum and exchanges heat with the heat pump system. Moreover, when there are many clothes in the drum, the flow of hot air will be hindered, resulting in low utilization efficiency of the auxiliary heating module.

[0003] Therefore, the art needs a new heat pump dryer and a control method thereof to solve the above technical problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing drum type heat pump dryer places an auxiliary heating module at the hot air inlet of the drum to increase the temperature of the hot air entering the drum, resulting in low utilization efficiency of the auxiliary heating module.

[0005] In a first aspect, the present invention provides a control method for a heat pump dryer, the heat pump dryer comprising an inner drum, a heat pump drying assembly and a heating assembly, the heat pump drying assembly comprising a drying air duct, a fan, a compressor, a condenser and an evaporator, the heating assembly being arranged on the wall of the inner drum, the control method comprising:

[0006] Obtaining a control instruction, wherein the control instruction includes a target drying mode;

[0007] Acquire clothing features, where the clothing features include clothing material;

[0008] Determining a target drying temperature of the drum wall according to the control instruction and the clothing characteristics;

[0009] Obtaining the current drying temperature of the drum wall;

[0010] The heating power of the heating component is adjusted according to the target drying temperature and the current drying temperature so that the drum wall is at the target drying temperature.

[0011] In the preferred technical solution of the control method of the heat pump dryer, the step of determining the target drying temperature of the drum wall according to the control instruction and the clothing characteristics comprises:

[0012] Calling a preset first mapping relationship table storing the correspondence between the target drying mode and the clothing material and the drying temperature;

[0013] The drying temperature is determined according to the target drying mode, the clothing material and the first mapping relationship table.

[0014] In the preferred technical solution of the control method of the heat pump dryer, the heat pump drying component includes a drying air duct, a fan, a compressor, a condenser and an evaporator, and the step of adjusting the heating power of the heating component according to the target drying temperature and the current drying temperature also includes:

[0015] Obtaining a comparison result between the current clothes drying temperature and the target clothes drying temperature;

[0016] The heating power of the heating component, the fan speed of the fan and / or the compression power of the compressor are adjusted according to the comparison result.

[0017] In the preferred technical solution of the control method of the heat pump dryer, the step of adjusting the heating power of the heating component, the fan speed of the fan and / or the compression power of the compressor according to the comparison result includes:

[0018] When the current drying temperature is lower than the target drying temperature, increasing the heating power and / or increasing the compression power and / or decreasing the fan speed;

[0019] When the current drying temperature is greater than the target drying temperature, reducing the heating power and / or reducing the compression power and / or increasing the fan speed;

[0020] When the current drying temperature is equal to the target drying temperature, the heating power, the compression power and the fan speed are kept unchanged.

[0021] In the preferred technical solution of the control method of the heat pump dryer, the step of adjusting the heating power of the heating component according to the target drying temperature and the current drying temperature further includes:

[0022] When the current clothes drying temperature is equal to the target clothes drying temperature, obtaining the air outlet temperature of the drying air duct;

[0023] When the air outlet temperature is greater than the target clothes drying temperature, reducing the compression power and / or increasing the fan speed;

[0024] When the air outlet temperature is lower than the target clothes drying temperature, increasing the compression power and / or reducing the fan speed;

[0025] When the air outlet temperature is equal to the target clothes drying temperature, the compression power and the fan speed are kept unchanged.

[0026] In the preferred technical solution of the control method of the heat pump dryer, the clothing characteristics include the initial weight of the clothing, and the step of determining the target drying temperature of the drum wall according to the control instruction and the clothing characteristics further includes:

[0027] Obtaining the current weight of the clothing;

[0028] calling a preset second mapping relationship table storing the initial weight, the current weight, the clothing material, the target drying mode and the target drying temperature;

[0029] The target drying temperature is determined according to the initial weight of the clothes, the current weight, the material of the clothes and the second mapping relationship table.

[0030] In the preferred technical solution of the control method of the heat pump dryer, the step of adjusting the heating power of the heating component according to the target drying temperature and the current drying temperature further includes:

[0031] Calling a preset third mapping relationship table storing a correspondence relationship between the current drying temperature, the target drying temperature, the clothing material, the current weight, the initial weight, the heating power, the fan speed of the fan, and the compression power of the compressor;

[0032] The heating power, the fan speed and the compression power are determined according to the current drying temperature, the target drying temperature, the current weight, the initial weight and the third mapping relationship table.

[0033] In the preferred technical solution of the control method of the heat pump dryer, the heat pump dryer further includes a prompting device, and the control method further includes:

[0034] When the difference between the current weight and the initial weight is less than a preset difference threshold, controlling the heating component, the fan and the compressor to stop running;

[0035] The prompting device is controlled to issue a reminder that the drying of clothes is completed.

[0036] In the preferred technical solution of the control method of the heat pump dryer, the target drying mode includes fast, standard and gentle.

[0037] In a second aspect, the present invention further provides a heat pump clothes dryer, the heat pump clothes dryer comprising a controller, wherein the controller is configured to execute the above control method.

[0038] When adopting the above technical solution, the present invention can directly heat the drum wall of the inner drum through the heating component, and can also determine the target drying temperature on the drum wall according to the material of the clothes. In this way, the risk of damaging the clothes can be reduced while the clothes inside the inner drum can be heated more evenly, thereby improving the drying efficiency of the heat pump dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The preferred embodiment of the present invention is described below by taking a drum washing machine as an example and in conjunction with the accompanying drawings, in which:

[0040] Figure 1 is a schematic structural diagram of a heat pump clothes dryer of the present invention;

[0041] Figure 2 is a flow chart of an implementation method of a heat pump clothes dryer of the present invention;

[0042] Figure 3 is a flow chart of another embodiment of a method for controlling a heat pump clothes dryer of the present invention;

[0043] Figure 4 is a flow chart of another embodiment of a method for controlling a heat pump clothes dryer of the present invention;

[0044] Figure 5 is a flow chart of another embodiment of a control method for a heat pump clothes dryer of the present invention;

[0045] Figure 6 is a flow chart of another embodiment of a method for controlling a heat pump clothes dryer of the present invention;

[0046] Figure 7 is a flow chart of another embodiment of a control method for a heat pump clothes dryer of the present invention;

[0047] Figure 8 is a flow chart of another embodiment of a method for controlling a heat pump clothes dryer of the present invention;

[0048] Fig. 9 It is a flow chart of another embodiment of the control method of the heat pump dryer of the present invention.

[0049] List of reference numerals:

[0050] 100. Heat pump dryer; 1. Outer drum; 2. Inner drum; 3. Heating component; 4. Clothing feature detection module; 5. Drying air duct; 6. Heat pump drying component; 61. Fan; 62. Compressor; 63. Condenser; 64. Evaporator; 7. Second temperature sensor; 8. First temperature sensor. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present application 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 application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific applications. For example, although the description is described in conjunction with a drum washing machine, it is obvious that it can also be applied to a clothing care device with a rotatable clothing treatment drum.

[0052] It should be noted that, in the description of the present invention, the terms "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are merely for the convenience of description, and do not indicate or imply that a device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, and thus, the features defined as "first", "second" and "third" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0053] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Figure 1 It is a schematic structural diagram of a heat pump dryer according to an embodiment of the present invention. Figure 2 The flowchart is a method for controlling a heat pump dryer according to an embodiment of the present invention. Figure 3 It is a flow chart of another implementation manner of a control method for a heat pump dryer according to an embodiment of the present invention. Figure 4 It is a flow chart of another implementation manner of a control method for a heat pump dryer according to an embodiment of the present invention. Figure 5 It is a flow chart of another implementation manner of a control method for a heat pump dryer according to an embodiment of the present invention. Figure 6 It is a flow chart of another implementation manner of a control method for a heat pump dryer according to an embodiment of the present invention. Figure 7 It is a flow chart of another implementation manner of a control method for a heat pump dryer according to an embodiment of the present invention. Figure 8It is a flow chart of another implementation manner of a control method for a heat pump dryer according to an embodiment of the present invention. Fig. 9 It is a flow chart of another implementation manner of a control method for a heat pump dryer according to an embodiment of the present invention.

[0055] like Figure 1 As shown, in order to solve the problem that the existing drum-type heat pump dryer places an auxiliary heating module at the hot air inlet of the drum to increase the temperature of the hot air entering the drum, resulting in low utilization efficiency of the auxiliary heating module, the present invention provides a heat pump dryer 100, the heat pump dryer 100 comprises an outer drum 1, an inner drum 2, a heat pump drying assembly 6 and a heating assembly 3, and the inner drum 2 is rotatably connected to the inner part of the outer drum 1. The heat pump drying assembly 6 includes a drying air duct 5, a fan 61, a compressor 62, a condenser 63 and an evaporator 64. The air outlet of the drying air duct 5 is connected to the hot air inlet of the drum, and the air inlet of the drying air duct 5 is connected to the hot air outlet of the drum. The condenser 63 and the evaporator 64 are both installed in the drying air duct 5. Specifically, the evaporator 64 is installed at the end of the drying air duct 5 close to the air inlet, and the condenser 63 is installed at the end of the drying air duct 5 away from the air inlet, so that the evaporator 64 can cool the hot air entering the drying air duct 5, and then the hot air can be dried. In this way, when the air continues to flow in the drying air duct 5, it can be heated by the condenser 63 to form high-temperature gas. The compressor 62 is arranged inside the heat pump dryer 100, and is connected to the condenser 63 and the evaporator 64 through a refrigerant pipeline. The fan 61 is arranged in the drying air duct 5 to drive the air to circulate in the outer drum 1 and the drying air duct 5. The heating component 3 is installed on the wall of the inner drum 2. Specifically, the heating component 3 is a flexible heater, which is installed on the outer wall of the inner drum 2 to heat the wall of the inner drum 2. More specifically, the flexible heater is an annular heater so that the flexible heater can be sleeved on the outer wall of the inner drum 2. In this way, the flexible heater can evenly heat the wall of the inner drum 2, so that the clothes placed in the inner drum 2 can be evenly heated when the inner drum 2 rotates, thereby heating the evaporation rate of liquid water in the clothes, thereby improving the drying efficiency of the heat pump dryer 100.

[0056] It should be noted that, although the flexible heater described above is arranged on the outer wall of the inner cylinder 2, this is not restrictive, and those skilled in the art may also arrange the flexible heater on the inner wall of the inner cylinder 2 or install it on both the inner wall and the outer wall of the inner cylinder 2 as needed. Such adjustment does not deviate from the principle of the present invention and therefore will fall within the protection scope of the present invention.

[0057] As a possible implementation, Figure 1As shown, the heat pump clothes dryer 100 further includes a first temperature sensor 8, which is disposed on the inner wall of the inner drum 2 and is used to detect the drying temperature of the inner wall of the inner drum 2. It should be noted that in the specific implementation of the present invention, there are multiple first temperature sensors 8, which are evenly distributed on the inner wall of the inner drum 2 and are used to detect the average drying temperature of the inner wall of the inner drum 2.

[0058] As a possible implementation, Figure 1 As shown, the heat pump dryer 100 further includes a clothing feature detection module 4, which is installed in the inner drum 2 and is used to detect clothing features of clothing placed in the inner drum 2. Specifically, as an implementation of the heat pump dryer 100 provided in this embodiment, the clothing feature detection module 4 includes a clothing material type detector and a weight sensor. The clothing material type detector can directly determine the material type of clothing. For example, the existing clothing material type detector includes a clothing material detection instrument for various clothing materials based on spectroscopy, infrared thermal imaging and computer vision technology for detecting clothing material and / or clothing color. The weight sensor is arranged at the connection between the inner drum 2 and the outer drum 1, and is used to detect the initial weight and current weight of the clothing placed in the inner drum 2, wherein the initial weight is the weight of the dry clothes before the drum washing machine washes the clothes.

[0059] It should be noted that, although the above description is that the material type of the clothes to be dried placed in the inner drum 2 is directly determined by the clothes material type detector disposed inside the inner drum 2, this is not restrictive. In other embodiments of the present invention, an image detection device (not shown) for detecting the label information on the clothes to be dried may also be disposed inside the inner drum 2, such as a camera, a scanner or a camera. In this case, before placing the clothes to be dried inside the inner drum 2, the side of the clothes to be dried with the label needs to be placed outside so that the label on the clothes to be dried can be exposed outside, so that the image detection device can obtain the image information on the label, wherein each piece of clothes to be dried is provided with a corresponding label. After the image detection device obtains the label information on the clothes to be dried, the label information is matched with the clothes feature library to obtain the clothes feature information corresponding to the clothes. The label information may include information such as the product number and brand of the clothes. The clothing feature library stores clothing feature information, including product number information, and information such as clothing material and dry weight of the clothing to be dried corresponding to the product number, wherein the product number is a unique identifier of the clothing to be dried, so that the feature information of the clothing to be dried can be obtained by identifying the product number. Specifically, the product number can be a serial number or a QR code, and can obviously be other forms of identification, as long as the corresponding clothing to be dried can be obtained by identifying the product number. The clothing feature library can be stored in the heat pump dryer 100 or the cloud server.

[0060] In addition, although the clothing material type detector or image detection device described above is arranged inside the inner drum 2, this is not restrictive. In other embodiments of the present invention, the clothing material type detector or the image detection device may also be arranged outside the heat pump dryer 100. In this case, when the user needs to use the heat pump dryer 100 to dry the clothes to be dried, it is necessary to detect the material of the clothes through the clothing material type detector or identify the label on the clothes through the image detection device, so that the heat pump dryer 100 can detect information such as the material of the clothes.

[0061] In the present application, the heat pump dryer 100 further includes a controller (not shown), which is respectively connected to the heating assembly 3, the fan 61, the compressor 62, the clothing feature detection module 4 and the first temperature sensor 8, so that the controller can dry the clothing inside the inner drum 2 based on the control instructions and clothing features input by the user. It should be noted that the controller can be a control chip of the heat pump dryer 100 itself, or a control module specifically used to execute the control method of the present application, or a functional unit of the control module.

[0062] Below, refer to Figure 2-Figure 9To illustrate possible implementations of the control method for the heat pump dryer of the present invention.

[0063] like Figure 2 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0064] S101: Obtaining a control instruction, where the control instruction includes a target drying mode;

[0065] S102: Acquire clothing features, where the clothing features include clothing material;

[0066] S103: Determine the target drying temperature of the drum wall according to the control instruction and the characteristics of the clothes;

[0067] S104: obtaining the current drying temperature of the drum wall;

[0068] S105: adjusting the heating power of the heating component according to the target drying temperature and the current drying temperature so that the drum wall is at the target drying temperature.

[0069] In S101, the control instruction is input by the user through a control panel (not shown) disposed on the housing of the heat pump dryer, and the control instruction includes a target drying mode selected by the user and required to be performed by the heat pump dryer.

[0070] It should be noted that, although the above description is that the user inputs the control instructions through the control panel, this is not restrictive. When the present invention is implemented, the control instructions can also be input through a mobile terminal.

[0071] In S102, when the clothes are put into the inner drum, the clothes material type detector detects the clothes material of the clothes, and then the clothes material type detector sends the detected clothes material information to the controller. Specifically, the detected clothes material information includes clothes mainly made of cotton, silk, linen or synthetic fibers. Moreover, in the specific implementation of the present invention, if the clothes material type detector detects that there are multiple materials of clothes put into the inner drum, resulting in a large difference in the drying degree of the clothes when the same drying plan is used to dry the put clothes, the control panel will issue a voice prompt message that the clothes material does not meet the requirements. For example, when the clothes include clothes mainly made of cotton and clothes mainly made of silk, since the clothes made of cotton have strong water absorption and are easy to shrink, in order to avoid shrinkage, the drying temperature of the inner drum wall can be controlled at 40°C-60°C, while the clothes made of silk are delicate and soft and are easy to be damaged. In order to reduce the risk of damage to the clothes caused by the heat pump dryer drying the clothes, the drying temperature of the inner drum wall can be controlled at 30°C-40°C. Therefore, when the clothes mainly made of cotton and clothes mainly made of silk are mixed in the clothes, the user needs to take the clothes mainly made of cotton or the clothes mainly made of silk out of the inner drum, so that when the heat pump dryer of the present invention dries the clothes, the drying temperature of the inner drum wall can ensure that the liquid water in the clothes has a high evaporation rate without exceeding the safety temperature, thereby improving the drying efficiency of the heat pump dryer, wherein the safety temperature is the temperature at which the drying temperature of the inner drum wall does not affect the service life of the clothes when the heat pump dryer dries the clothes.

[0072] In S103, after obtaining the information about the material of the clothes, the heat pump dryer determines the target drying temperature of the inner drum wall according to the control instructions input by the user, so that the heat pump dryer can dry the clothes at the target drying temperature in the subsequent drying process, wherein the target drying temperature is a drying temperature corresponding to the target drying mode and can cause less damage to the clothes.

[0073] In S104, the current drying temperature of the inner drum wall is acquired by the first temperature sensor.

[0074] In S105, the controller adjusts the heating power of the heating component according to the acquired current drying temperature and the determined target drying temperature, so that the temperature of the inner drum wall is the target drying temperature. In this way, the heat pump dryer can reduce the risk of damage to clothes during the drying process and still have a higher drying efficiency, thereby improving user satisfaction.

[0075] like Figure 3 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0076] S201: calling a preset first mapping relationship table storing a correspondence between a target drying mode and clothing material and drying temperature;

[0077] S202: Determine the drying temperature according to the target drying mode, the clothing material and the first mapping relationship table.

[0078] In the specific implementation of the present invention, a first mapping relationship table of the correspondence between the target drying mode, clothing material and drying temperature is stored inside the controller, so that when the controller receives information on the clothing material and the target drying mode, the controller can compare the received information on the clothing material and the target drying mode with the first mapping relationship table to determine the drying temperature of the inner wall of the inner drum.

[0079] like Figure 4 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0080] S301: Obtaining a comparison result between the current drying temperature and the target drying temperature;

[0081] S302: Adjust the heating power of the heating component, the fan speed of the fan, and the compression power of the compressor according to the comparison result.

[0082] In the specific implementation of the present invention, the controller obtains a comparison result between the current temperature and the target drying temperature, and then adjusts the heating power of the heating component, the fan speed of the fan and the compression power of the compressor according to the comparison result. Through the above-mentioned setting method, the heat pump dryer of the present invention can adjust the operation of the heat pump drying component on the basis of adjusting the heating power of the heating component, so that the heat pump dryer can dry clothes more intelligently to ensure the drying effect of the heat pump dryer.

[0083] like Figure 5 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0084] S401: when the current drying temperature is lower than the target drying temperature, increasing the heating power and / or increasing the compression power and / or reducing the fan speed;

[0085] S402: when the current drying temperature is greater than the target drying temperature, reducing the heating power and / or reducing the compression power and / or increasing the fan speed;

[0086] S403: When the current drying temperature is equal to the target drying temperature, the heating power, the compression power and the fan speed are kept unchanged.

[0087] In S401, when the current drying temperature is less than the target drying temperature, it indicates that the surface temperature of the inner wall of the inner drum needs to be increased. At this time, the heating power of the heating component can be increased by the controller to increase the surface temperature of the inner wall of the inner drum, so that the surface temperature of the inner wall of the inner drum reaches the target drying temperature. It should be noted that although the above description is that the controller increases the surface temperature of the inner wall of the inner drum by increasing the heating power of the heating component, this is not restrictive. In the specific implementation of the present invention, when the current drying temperature is less than the target drying temperature, the temperature of the hot air can be increased by increasing the compression power of the compressor, thereby indirectly increasing the surface temperature of the inner wall of the inner drum, so that the surface temperature of the inner wall of the inner drum reaches the target drying temperature. But this is also not restrictive. In the specific implementation of the present invention, when the current drying temperature is less than the target drying temperature, the air temperature inside the inner drum can be increased by reducing the fan speed of the fan, thereby indirectly increasing the surface temperature of the inner wall of the inner drum. However, this is not restrictive. In the specific implementation of the present invention, when the current drying temperature is lower than the target drying temperature, technicians in this field can also adjust the surface temperature of the inner wall of the inner drum by controlling at least two parameters, including the heating power of the heating component, the compression power of the compressor or the fan speed, through a controller as needed. Such adjustment does not deviate from the principle of the present invention and therefore will fall within the protection scope of the present invention.

[0088] In S402, when the current drying temperature is greater than the target drying temperature, it indicates that the surface temperature of the inner wall of the inner drum needs to be reduced. At this time, the controller can reduce the heating power of the heating component to increase the surface temperature of the inner wall of the inner drum, so that the surface temperature of the inner wall of the inner drum reaches the target drying temperature. It should be noted that although the above description is that the controller reduces the surface temperature of the inner wall of the inner drum by reducing the heating power of the heating component, this is not restrictive. In the specific implementation of the present invention, when the current drying temperature is greater than the target drying temperature, the temperature of the hot air can be reduced by reducing the compression power of the compressor, thereby indirectly reducing the surface temperature of the inner wall of the inner drum, so that the surface temperature of the inner wall of the inner drum reaches the target drying temperature. But this is also not restrictive. In the specific implementation of the present invention, when the current drying temperature is greater than the target drying temperature, the air temperature inside the inner drum can be reduced by increasing the fan speed of the fan, thereby indirectly reducing the surface temperature of the inner wall of the inner drum. However, this is not restrictive. In the specific implementation of the present invention, when the current drying temperature is greater than the target drying temperature, technicians in this field can also adjust the surface temperature of the inner wall of the inner drum by controlling at least two parameters of the heating power of the heating component, the compression power of the compressor or the fan speed through the controller as needed. Such adjustment does not deviate from the principle of the present invention and therefore will fall within the protection scope of the present invention.

[0089] In S403, when the current drying temperature is equal to the target drying temperature, the heating power of the heating component, the compression power of the compressor and the fan speed are kept unchanged so that the surface temperature of the inner wall of the inner drum remains unchanged.

[0090] like Figure 6 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0091] S501: When the current drying temperature is equal to the target drying temperature, obtaining the air outlet temperature of the drying air duct;

[0092] S502: when the air outlet temperature is greater than the target drying temperature, reducing the compression power and / or increasing the fan speed;

[0093] S503: when the air outlet temperature is lower than the target drying temperature, increasing the compression power and / or reducing the fan speed;

[0094] S504: When the air outlet temperature is equal to the target drying temperature, the compression power and the fan speed are kept unchanged.

[0095] In S501, when the current clothes drying temperature is equal to the target clothes drying temperature, the second temperature sensor 7 provided at the air outlet of the drying air duct detects the air outlet temperature of the drying air duct.

[0096] In S502, when the air outlet temperature detected by the second temperature sensor 7 is greater than the target drying temperature, it means that the temperature of the air in the inner drum is greater than the surface temperature of the inner wall of the inner drum. At this time, the compression power of the compressor can be reduced and / or the fan speed of the fan can be increased through the controller so that the air temperature in the inner drum can be reduced, thereby reducing the risk of damage to clothes due to drying.

[0097] In S503, when the air outlet temperature detected by the second temperature sensor 7 is lower than the target drying temperature, it means that the temperature of the air in the inner drum is lower than the surface temperature of the inner wall of the inner drum. At this time, the compression power of the compressor can be increased and / or the fan speed of the fan can be reduced through the controller so that the air temperature in the inner drum can be increased, thereby improving the drying efficiency of the heat pump dryer.

[0098] In S504, when the air outlet temperature detected by the second temperature sensor 7 is equal to the target drying temperature, the temperature of the air in the inner drum is equal to the surface temperature of the inner wall of the inner drum. At this time, the compression power of the compressor and the fan speed of the fan can be kept unchanged by the controller to ensure the drying efficiency of the heat pump dryer.

[0099] like Figure 7 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0100] S601: Obtain the current weight of the clothes;

[0101] S602: calling a preset second mapping relationship table storing initial weight, current weight, clothing material, target drying mode and target drying temperature;

[0102] S603: Determine the target drying temperature according to the initial weight of the clothes, the current weight, the material of the clothes, the target drying mode and the second mapping relationship table.

[0103] In the specific implementation of the present invention, a second mapping relationship table of initial weight, current weight, clothing material, target drying mode and target drying temperature is stored in the controller, so that when the controller receives the initial weight, current weight, clothing material and target drying mode, it can compare with the second mapping relationship table to determine the target drying temperature of the inner wall of the inner drum. Among them, the initial weight of the clothing can be obtained through a gravity sensor or through the label information of the clothing itself. Specifically, in the specific implementation of the present invention, when the clothing material and target drying mode inside the inner drum are determined, since the moisture content of the clothing will change with the operation of the drying program of the heat pump dryer, at this time, the target drying temperature of the suitable clothing on the inner wall of the inner drum will also change. In order to determine the target drying temperature corresponding to the moisture content of the clothing, those skilled in the art can pre-train the corresponding relationship between the clothing material, the initial weight of the clothing, the current weight of the clothing, the target drying mode and the target drying temperature based on experiments, calculations and other means, and store the trained corresponding relationship in the second mapping relationship table.

[0104] like Figure 8 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0105] S701: calling a preset third mapping relationship table storing the corresponding relationship between the current drying temperature, the target drying temperature, the clothing material, the current weight, the initial weight, the heating power, the fan speed and the compression power;

[0106] S702: Determine heating power, fan speed and compression power according to the current drying temperature, target drying temperature, current weight, initial weight and a third mapping relationship table.

[0107] In the specific implementation of the present invention, the controller internally stores a third mapping relationship table of the correspondence between the current drying temperature, target drying temperature, clothing material, current weight, initial weight, heating power, fan speed and compression power, so that after the controller obtains the information of the current drying temperature, target drying temperature, clothing material, current weight and initial weight, it can compare with the third mapping relationship table to determine the heating power of the heating component, the fan speed of the fan and the compression power of the compressor, so that the heat pump dryer can determine the heating power of the heating component, the fan speed of the fan and the compression power of the compressor according to the current drying temperature, target drying temperature, clothing material, current weight and initial weight.

[0108] like Fig. 9 As shown, in a possible implementation manner, the control method of the heat pump dryer of the present invention includes the following steps:

[0109] S801: When the difference between the current weight and the initial weight is less than a preset difference threshold, the heating component, the fan and the compressor are controlled to stop running;

[0110] S802: Control the prompting device to issue a reminder that the drying process is complete.

[0111] In S801, when the difference between the current weight and the initial weight is less than the preset difference threshold, it means that the heat pump dryer has finished drying the clothes. At this time, the controller can control the heating component, the fan and the compressor to stop running, so that the heat pump dryer can stop running in time, reduce the energy consumption of the heat pump dryer, and reduce the user's use cost. It should be noted that the preset difference threshold can be determined by the designer based on experience, experiments, calculations, etc. For example, the value of the preset difference threshold can be set to 5g, so that when the difference between the current weight and the initial weight is less than 5g, it means that the clothes are already in a drying state.

[0112] In S802, when the difference between the current weight and the initial weight is less than a preset difference threshold, the controller controls the prompt device installed in the control panel to issue a reminder that the drying is completed so that the user can take out the clothes in time.

[0113] Preferably, in the specific implementation of the present invention, the target drying mode includes fast, standard and gentle. It should be noted that although the target drying mode described above includes three types of fast, standard and gentle, this is not restrictive. In the specific implementation of the present invention, the target drying mode may also include two, four or more types. Such adjustment does not deviate from the principle of the present invention and therefore falls within the protection scope of the present invention.

[0114] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0115] It should be noted that although the detailed steps of the method of the present application are described in detail above, without departing from the basic principles of the present application, technical personnel in this field can combine, split and change the order of the above steps. The modified technical solution does not change the basic concept of the present application and therefore falls within the scope of protection of the present application.

[0116] 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 control method for a heat pump dryer, characterized in that: The heat pump clothes dryer comprises an inner drum, a heat pump clothes drying assembly and a heating assembly, wherein the heating assembly is arranged on the wall of the inner drum, and the control method comprises: Obtaining a control instruction, wherein the control instruction includes a target drying mode; Acquire clothing features, where the clothing features include clothing material; Determining a target drying temperature of the drum wall according to the control instruction and the clothing characteristics; Obtaining the current drying temperature of the drum wall; The heating power of the heating component is adjusted according to the target drying temperature and the current drying temperature so that the drum wall is at the target drying temperature.

2. The control method according to claim 1, characterized in that: The step of "determining the target drying temperature of the drum wall according to the control instruction and the clothing characteristics" includes: Calling a preset first mapping relationship table storing the correspondence between the target drying mode and the clothing material and the drying temperature; The drying temperature is determined according to the target drying mode, the clothing material and the first mapping relationship table.

3. The control method according to claim 1, characterized in that: The heat pump clothes drying component includes a drying air duct, a fan, a compressor, a condenser and an evaporator, and the step of "adjusting the heating power of the heating component according to the target clothes drying temperature and the current clothes drying temperature" also includes: Obtaining a comparison result between the current clothes drying temperature and the target clothes drying temperature; The heating power of the heating component, the fan speed of the fan and / or the compression power of the compressor are adjusted according to the comparison result.

4. The control method according to claim 3, characterized in that: The step of "adjusting the heating power of the heating component, the fan speed of the fan and / or the compression power of the compressor according to the comparison result" includes: When the current drying temperature is lower than the target drying temperature, increasing the heating power and / or increasing the compression power and / or decreasing the fan speed; When the current drying temperature is greater than the target drying temperature, reducing the heating power and / or reducing the compression power and / or increasing the fan speed; When the current drying temperature is equal to the target drying temperature, the heating power, the compression power and the fan speed are kept unchanged.

5. The control method according to claim 3, characterized in that: The step of "adjusting the heating power of the heating component according to the target drying temperature and the current drying temperature" also includes: When the current clothes drying temperature is equal to the target clothes drying temperature, obtaining the air outlet temperature of the drying air duct; When the air outlet temperature is greater than the target clothes drying temperature, reducing the compression power and / or increasing the fan speed; When the air outlet temperature is lower than the target clothes drying temperature, increasing the compression power and / or reducing the fan speed; When the air outlet temperature is equal to the target clothes drying temperature, the compression power and the fan speed are kept unchanged.

6. The control method according to claim 3, characterized in that: The clothing characteristics include the initial weight of the clothing, and the step of "determining the target drying temperature of the drum wall according to the control instruction and the clothing characteristics" further includes: Obtaining the current weight of the clothing; calling a preset second mapping relationship table storing the initial weight, the current weight, the clothing material, the target drying mode and the target drying temperature; The target drying temperature is determined according to the initial weight of the clothes, the current weight, the material of the clothes and the second mapping relationship table.

7. The control method according to claim 6, characterized in that: The step of "adjusting the heating power of the heating component according to the target drying temperature and the current drying temperature" also includes: Calling a preset third mapping relationship table storing a correspondence relationship between the current drying temperature, the target drying temperature, the clothing material, the current weight, the initial weight, the heating power, the fan speed of the fan, and the compression power of the compressor; The heating power, the fan speed and the compression power are determined according to the current drying temperature, the target drying temperature, the current weight, the initial weight and the third mapping relationship table.

8. The control method according to claim 7, characterized in that: The heat pump clothes dryer further includes a prompting device, and the control method further includes: When the difference between the current weight and the initial weight is less than a preset difference threshold, controlling the heating component, the fan and the compressor to stop running; The prompting device is controlled to issue a reminder that the drying of clothes is completed.

9. The control method according to claim 1, characterized in that: The target drying modes include fast, standard and gentle.

10. A heat pump clothes dryer, characterized in that: The heat pump dryer comprises a controller configured to execute the control method according to any one of claims 1-9.

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