Heat pump clothes dryer and control method thereof

Abstract

The present application relates to the technical field of clothes dryers, and particularly provides a heat pump clothes dryer and a control method thereof, aiming to solve the problem that the existing heat pump clothes dryer using environmentally-friendly refrigerant has combustion or explosion accidents caused by refrigerant leakage after adding an auxiliary heating device. To this end, the present application provides a heat pump clothes dryer, which comprises a drying air duct, and the drying air duct is provided with an auxiliary heating device, the auxiliary heating device comprises a metal body and an induction coil, the metal body is arranged inside the drying air duct, the induction coil is arranged on the periphery of the drying air duct and is correspondingly arranged with the metal body, and the induction coil is used to generate an alternating magnetic field to heat the metal body, so as to heat the air in the drying air duct. By arranging the auxiliary heating device, high temperature or electric sparks can be avoided in the drying air duct, even if refrigerant leakage occurs, combustion or explosion accidents caused by leakage can also be avoided, so as to improve the safety of the equipment.

Description

Technical Field

[0001] This invention relates to the field of clothes dryer technology, and specifically provides a heat pump clothes dryer and its control method. Background Technology

[0002] A clothes dryer is an appliance used to accelerate the drying process of clothes. Types include direct-vent type, ordinary condenser type, and heat pump condenser type. A heat pump condenser dryer, also known as a heat pump dryer, mainly consists of a heat pump system and a circulating air path. The heat pump system includes a compressor, evaporator, condenser, and expansion valve. The drying process is as follows: air is heated into dry, hot air by the condenser of the heat pump system. As this dry, hot air passes through the wet clothes, the moisture on the clothes evaporates into water vapor, which condenses with the airflow, creating humid, hot air. After passing through the evaporator, the water vapor condenses into condensate, transforming the humid, hot air into dry, cold air. This dry, cold air then passes through the condenser again, entering the next cycle until the wet clothes are dried.

[0003] Heat pump systems rely on refrigerants for operation. Refrigerants are typically fluorinated or non-fluorinated. Fluorinated refrigerants, due to their potential to deplete the ozone layer when released into the atmosphere, have been gradually phased out and replaced by environmentally friendly non-fluorinated refrigerants. R290 (propane) refrigerant is an environmentally friendly refrigerant and widely used in heat pump systems, but it is flammable and explosive. When this refrigerant leaks, it can easily ignite or explode due to electrical sparks, high temperatures, or other causes.

[0004] Existing heat pump dryers experience slower compressor heating when operating in low-temperature environments, affecting drying speed. To accelerate drying, auxiliary heating devices are typically added to the drying duct to quickly raise the airflow temperature. However, these auxiliary heating devices are usually electric heaters, posing a risk of electrical sparks. If the refrigerant in the heat pump system is an environmentally friendly refrigerant, such as R290, a refrigerant leak could easily lead to combustion or explosion, posing a significant safety hazard. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that existing heat pump dryers using environmentally friendly refrigerants may cause combustion or explosion accidents due to refrigerant leakage after the addition of auxiliary heating devices.

[0006] In a first aspect, the present invention provides a heat pump dryer, the heat pump dryer including a drying air duct, the drying air duct being equipped with an auxiliary heating device, the auxiliary heating device including a metal body and an induction coil, the metal body being disposed inside the drying air duct, the induction coil being arranged around the drying air duct and correspondingly disposed to the metal body, the induction coil being used to generate an alternating magnetic field to heat the metal body, thereby heating the air inside the drying air duct.

[0007] In some feasible embodiments of the heat pump dryer described above, the heat pump dryer further includes a heat dissipation duct and a cooling fan. The heat dissipation duct is located around the drying duct. The air inlet and air outlet of the heat dissipation duct are respectively connected to the outside of the heat pump dryer. The heat dissipation duct and the induction coil are arranged such that air can flow through the induction coil when it is driven by the cooling fan.

[0008] In some feasible embodiments of the heat pump dryer described above, the heat pump dryer further includes a rear panel, on which louvered air vents are provided, and the air inlet and outlet of the heat dissipation duct are connected to the external environment through the louvered air vents; and / or

[0009] The induction coil is completely enclosed within the heat dissipation duct.

[0010] In some feasible embodiments of the heat pump dryer described above, the metal body is equipped with a first temperature sensor for detecting the temperature of the metal body. The heat pump dryer also includes a controller connected to the induction coil and the first temperature sensor, respectively. The controller is configured to selectively control the energizing state of the induction coil based at least on the detection result of the first temperature sensor.

[0011] The heat pump dryer provided by this invention, by setting up an auxiliary heating device and arranging the induction coil outside the drying air duct, assists the heat pump system of the heat pump dryer in heating the air. While improving the heating efficiency of the dryer during the drying process, it can avoid the generation of high temperature or electric sparks in the drying air duct. Even in the event of refrigerant leakage, it can also avoid combustion or explosion accidents caused by the leakage, thereby improving the safety of the equipment.

[0012] Secondly, the present invention also provides a control method for a heat pump dryer, wherein the heat pump dryer is any one of the heat pump dryers described above, and the control method includes:

[0013] After energizing the induction coil, the real-time metal temperature value of the metal body is obtained;

[0014] The real-time metal temperature value is compared with the preset metal temperature value;

[0015] Based on the comparison results, the induction coil is selectively disconnected.

[0016] In some feasible embodiments of the control method for the heat pump dryer described above, the phrase "selectively disconnecting the induction coil based on the comparison result" includes:

[0017] If the real-time metal temperature value is greater than or equal to the preset metal temperature value, then the induction coil is disconnected.

[0018] If the real-time metal temperature value is less than or equal to or less than the preset metal temperature value, the induction coil is kept energized.

[0019] In some feasible embodiments of the control method for the above-described heat pump dryer, the control method further includes:

[0020] Before obtaining the real-time metal temperature value of the metal body, obtain the real-time ambient temperature value of the area surrounding the drying duct;

[0021] The real-time ambient temperature value is compared with the preset ambient temperature value;

[0022] If the real-time ambient temperature value is greater than or equal to the preset ambient temperature value, then the induction coil is disconnected.

[0023] If the real-time ambient temperature value is less than or equal to or less than the preset ambient temperature value, then the induction coil is energized.

[0024] In some feasible embodiments of the control method for the heat pump dryer described above, the heat pump dryer further includes a compressor, and the control method further includes:

[0025] Before obtaining the real-time ambient temperature value around the drying duct, obtain the real-time refrigerant temperature value at the compressor outlet.

[0026] The real-time refrigerant temperature value is compared with the first preset refrigerant temperature value;

[0027] If the real-time refrigerant temperature value is greater than or equal to the first preset refrigerant temperature value, then the compressor stops running and the induction coil is disconnected.

[0028] If the real-time refrigerant temperature value is less than or equal to or less than the first preset refrigerant temperature value, then the compressor shall continue to run.

[0029] In some feasible embodiments of the control method for the above-described heat pump dryer, the control method further includes:

[0030] After stopping the compressor and disconnecting the induction coil, the real-time refrigerant temperature value at the compressor outlet is acquired again.

[0031] The newly acquired real-time refrigerant temperature value is compared with the second preset refrigerant temperature value;

[0032] If the real-time refrigerant temperature value obtained again is greater than or equal to the second preset refrigerant temperature value, then return to the step of obtaining the real-time refrigerant temperature value at the compressor outlet again.

[0033] If the real-time refrigerant temperature value obtained again is less than or equal to or less than the second preset refrigerant temperature value, then the compressor is started.

[0034] Wherein, the second preset refrigerant temperature value is less than the first preset refrigerant temperature value.

[0035] In some feasible embodiments of the control method for the above-described heat pump dryer, the control method further includes:

[0036] Before obtaining the real-time refrigerant temperature value at the compressor outlet, obtain the real-time refrigerant concentration value inside the drying duct and / or outside the drying duct.

[0037] Compare the real-time refrigerant concentration value with the preset refrigerant concentration value;

[0038] If the real-time refrigerant concentration value is greater than or equal to the preset refrigerant concentration value, then at least the compressor should be stopped and the induction coil should be disconnected.

[0039] If the real-time refrigerant concentration value is less than or equal to or less than the preset refrigerant concentration value, the compressor shall continue to operate.

[0040] The control method provided by this invention detects the temperature of the metal body and controls the energization state of the induction coil based on the real-time metal temperature value of the metal body. This can prevent the metal body temperature from becoming too high, thereby preventing the leaked refrigerant from igniting due to high temperature, thus avoiding the risk of deflagration or explosion and improving the safety of the equipment. Attached Figure Description

[0041] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0042] Figure 1 This is a schematic diagram of the structure of the heat pump dryer of the present invention;

[0043] Figure 2 This is one of the working principle diagrams of the heat pump dryer of the present invention;

[0044] Figure 3 This is the second working principle diagram of the heat pump dryer of the present invention;

[0045] Figure 4 This is a flowchart of the control method for the heat pump dryer of the present invention.

[0046] List of reference numerals in the attached diagram:

[0047] 1-Heat pump system; 11-Compressor; 12-Condenser; 13-Throttling device; 14-Evaporator; 2-Electromagnetic induction heater; 21-Metal body; 22-Induction coil; 3-Drying air duct; 4-Rear panel; 41-First louvered air outlet; 42-Second louvered air outlet; 5-Heat dissipation air duct; 6-Heat dissipation fan; 71-First temperature sensor; 72-Second temperature sensor; 73-Third temperature sensor; 74-First refrigerant sensor; 75-Second refrigerant sensor. Detailed Implementation

[0048] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0049] It should be noted that in the description of this invention, terms such as "upper," "lower," "inner," and "outer" that indicate direction or positional relationship are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0050] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] like Figure 1 As shown, this embodiment of the invention provides a heat pump dryer, which includes a housing, a clothes handling drum, a heat pump system 1, a drying duct 3, and a drying fan. The clothes handling drum is disposed inside the housing and connected to the drying duct 3 to form an air circulation loop. Specifically, the air outlet of the clothes handling drum is connected to the air inlet of the drying duct 3, and the air outlet of the drying duct 3 is connected to the air inlet of the clothes handling drum. The drying fan is disposed inside the drying duct 3. The rear side of the housing has a rear plate 4, on which multiple louvered air vents are constructed for heat dissipation of the compressor 11. In this embodiment, a portion of the drying duct 3 is disposed inside the housing, and another portion is disposed outside the housing. Specifically, the drying duct 3 passes through the rear plate 4 from the inside of the housing to the outside, and the portion of the drying duct 3 disposed outside passes through the rear plate 4 again to return to the inside of the housing.

[0052] Continue to refer to Figure 1 The heat pump system 1 includes a compressor 11, a condenser 12, a throttling device 13, and an evaporator 14 connected to form a refrigerant circulation loop. The evaporator 14 and condenser 12 are arranged sequentially inside the drying duct 3 along the air outlet direction. When the dryer executes the drying program, the compressor 11 starts, causing the refrigerant to flow sequentially through the condenser 12, the throttling device 13, and the evaporator 14, finally returning to the compressor 11 to complete one cycle. Specifically, the compressor 11 compresses the refrigerant to increase its pressure and temperature; when the high-temperature, high-pressure refrigerant flows into the condenser 12, the condenser 12 releases heat to heat the air; when the refrigerant passes through the throttling device 13, the throttling device 13 cools and reduces its pressure; when the low-temperature, low-pressure refrigerant flows into the evaporator 14, the evaporator 14 absorbs heat to condense water vapor in the air into liquid water, thereby reducing the humidity of the air.

[0053] like Figure 1 As shown, the dryer in this embodiment of the invention also includes an auxiliary heating device and a controller. The auxiliary heating device is specifically an electromagnetic induction heater 2. The electromagnetic induction heater 2 includes a metal body 21 and an induction coil 22. The metal body 21 is equipped with a first temperature sensor 71, which is used to detect the temperature of the metal body 21. The metal body 21 is disposed inside the drying duct 3 and located downstream of the condenser 12. The induction coil 22 is arranged around the drying duct 3 and is correspondingly disposed to the metal body 21. The induction coil 22 is used to generate an alternating magnetic field to heat the metal body 21, thereby heating the air in the drying duct 3. The controller is electrically connected to the induction coil 22 and the first temperature sensor 71 respectively. The controller is configured to selectively control the energizing state of the induction coil 22 based at least on the detection result of the first temperature sensor 71.

[0054] like Figure 2 As shown, the working principle of the drying program of the heat pump dryer in this embodiment of the invention is as follows: the compressor 11 and the drying fan are started and the induction coil 22 is energized. Under the driving action of the drying fan, the air in the drying duct 3 flows through the condenser 12 and the metal body 21 in sequence to be heated. The heated air flows into the clothes processing drum to heat the clothes, so that the moisture on the clothes will vaporize into water vapor. Then the air containing water vapor flows to the evaporator 14, where the water vapor is condensed into liquid water. The dried air then flows back to the condenser 12 and is heated. This cycle is repeated for a certain period of time to achieve the purpose of drying clothes.

[0055] The heat pump dryer provided by the present invention, by setting up an electromagnetic induction heater 2 and arranging the induction coil 22 outside the drying air duct 3, assists the heat pump system 1 of the heat pump dryer in heating the air. While improving the heating efficiency of the dryer during the drying process, it can avoid the generation of high temperature or electric sparks in the drying air duct 3. Even in the event of refrigerant leakage, it can also avoid combustion or explosion accidents caused by leakage, thereby improving the safety of the equipment.

[0056] Continue to refer to Figure 1 The heat pump dryer also includes a heat dissipation duct 5 and a cooling fan 6. The heat dissipation duct 5 is located around the drying duct 3. The air inlet and outlet of the heat dissipation duct 5 are connected to the outside of the heat pump dryer. The heat dissipation duct 5 and the induction coil 22 are arranged such that when the air is driven by the cooling fan 6, it can flow through the induction coil 22, thereby carrying away the heat generated by the induction coil 22 and reducing the temperature of the induction coil 22.

[0057] Furthermore, the induction coil 22 is completely enclosed within the heat dissipation duct 5. This arrangement completely isolates the induction coil 22 from the drying duct 3, preventing the electrical sparks generated when the induction coil 22 is energized from contacting the refrigerant leaking into the drying duct 3, thus achieving explosion-proof functionality and improving the overall safety of the equipment.

[0058] Furthermore, in this embodiment, the air inlet and outlet of the heat dissipation duct 5 are connected to the external environment through louvered vents. Specifically, as shown... Figure 1 and Figure 3 As shown, the louvered air vent includes a first louvered air vent 41 and a second louvered air vent 42. The air inlet of the heat dissipation duct 5 is connected to the first louvered air vent 41, and its air outlet is connected to the second louvered air vent 42. Driven by the cooling fan 6, ambient air enters the heat dissipation duct 5 through the first louvered air vent 41, then flows through the induction coil 22 carrying the heat generated by the induction coil 22, and finally exits to the ambient environment through the second louvered air vent 42 to remove the heat generated by the induction coil 22. In this embodiment, the portion of the heat dissipation duct 5 near the drying duct 3 is configured as a ring structure, and the induction coil 22 is completely placed within the heat dissipation duct 5. Alternatively, the heat dissipation duct 5 can also be configured as a discontinuous structure, as long as the intake cold air can flow through at least a portion of the induction coil 22.

[0059] Continue to refer to Figure 1 The heat pump dryer also includes a second temperature sensor 72, which is disposed around the drying duct 3 to detect the ambient temperature of the surrounding area of ​​the drying duct 3. The controller is also electrically connected to the second temperature sensor 72 and is configured to selectively control the energization state of the induction coil 22 based on the detection result of the second temperature sensor 72.

[0060] With the above settings, the ambient temperature of the outer area of ​​the drying duct 3 can be detected in real time. Based on the real-time ambient temperature value of the outer area of ​​the drying duct 3, the energization state of the induction coil 22 can be controlled to avoid the hot air temperature in the drying duct 3 being too low, thereby improving the heating efficiency of the equipment. At the same time, it can also avoid the hot air temperature in the drying duct 3 being too high, thereby improving the overall safety of the equipment.

[0061] Continue to refer to Figure 1 The heat pump dryer also includes a third temperature sensor 73, which is located at the outlet end of the compressor 11 to detect the temperature at the outlet end of the compressor 11. The controller is electrically connected to both the compressor 11 and the third temperature sensor 73. The controller is also configured to selectively control the operating state of the compressor 11 and the energizing state of the induction coil 22 based on the detection result of the third temperature sensor 73. Through this configuration, the temperature at the outlet end of the compressor 11 can be detected in real time, thereby enabling control of the compressor 11's operating state based on the real-time refrigerant temperature value at the outlet end of the compressor 11. This prevents the refrigerant temperature output by the compressor 11 from becoming too high, improving the overall safety of the equipment.

[0062] Continue to refer to Figure 1 The heat pump dryer also includes a refrigerant sensor, which includes a first refrigerant sensor 74. The first refrigerant sensor 74 is located inside the drying duct 3 and is used to detect the refrigerant concentration inside the drying duct 3. The controller is also electrically connected to the drying fan and the first refrigerant sensor 74. The controller is further configured to selectively control the operating status of the compressor 11 and the drying fan, as well as the energizing status of the induction coil 22, based on the detection results of the first refrigerant sensor 74. Through the above settings, the refrigerant concentration inside the drying duct 3 can be detected in real time, thereby enabling control of the operating status of the compressor 11 and the drying fan, as well as the energizing status of the induction coil 22, based on the real-time refrigerant concentration value inside the drying duct 3. This prevents the dryer from continuing to run the drying program in the event of refrigerant leakage, improving the overall safety of the equipment.

[0063] Continue to refer to Figure 1The refrigerant sensor also includes a second refrigerant sensor 75, which is disposed around the periphery of the drying duct 3. The second refrigerant sensor 75 is used to detect the refrigerant concentration around the drying duct 3. The controller is also electrically connected to the second refrigerant sensor 75 and is configured to selectively control the operating status of the compressor 11 and the drying fan, as well as the energizing status of the induction coil 22, based on the detection results of the second refrigerant sensor 75. Through the above settings, the refrigerant concentration around the drying duct 3 can be detected in real time, thereby enabling control of the operating status of the compressor 11 and the drying fan, as well as the energizing status of the induction coil 22, based on the real-time refrigerant concentration value around the drying duct 3. This prevents the dryer from continuing to run the drying program in the event of refrigerant leakage, improving the overall safety of the equipment.

[0064] It should be noted that the refrigerant used in this embodiment of the invention is an environmentally friendly refrigerant, specifically R290 refrigerant, i.e., propane. R290 is the refrigerant code for propane, which is a colorless and odorless gas with excellent thermal and environmental properties. As a refrigerant, R290 has advantages such as high-efficiency refrigeration, good material compatibility, and cost-effectiveness. However, due to its flammability, special attention must be paid to safety issues during use, and appropriate safety measures must be taken to ensure its safe use.

[0065] This invention also provides a control method for a heat pump dryer, wherein the heat pump dryer is the same as the one described in the above embodiments, such as... Figure 4 As shown, the corresponding control methods include:

[0066] In step S100, the compressor 11 is started, which enables the condenser 12 to release heat to heat the air in the drying duct 3, and the evaporator 14 to absorb heat to condense the water vapor in the air in the drying duct 3 into liquid water; at the same time, the drying fan is started, which circulates the air in the drying duct 3, thereby drying the clothes in the clothes processing drum.

[0067] In step S210, the real-time refrigerant concentration values ​​inside the drying duct 3 and outside the drying duct 3 are obtained by the first refrigerant sensor 74 and the second refrigerant sensor 75, respectively.

[0068] Step S220: Compare the real-time refrigerant concentration value with the preset refrigerant concentration value.

[0069] In step S230, based on the comparison result of step S220, the operating status of compressor 11 and drying fan is selectively controlled, and induction coil 22 is selectively disconnected.

[0070] Specifically, step S230 includes:

[0071] In step S231a, if the real-time refrigerant concentration value is greater than the preset refrigerant concentration value, the compressor 11 and the drying fan will stop running, and the induction coil 22 will be disconnected.

[0072] In step S232a, if the real-time refrigerant concentration value is less than or equal to the preset refrigerant concentration value, the compressor 11 is kept running.

[0073] With the above settings, when the real-time refrigerant concentration value is detected to be greater than the preset refrigerant concentration value, it indicates that there is a refrigerant leak. It is necessary to turn off the electrical components of the dryer to prevent the electrical components from generating electric sparks during operation, which could ignite the refrigerant and cause a combustion or explosion accident.

[0074] It should be noted that steps S231a and S232a are executed in parallel; if one of them is executed, the other will not be executed.

[0075] In some specific embodiments, step S230 includes:

[0076] In step S231b, if the real-time refrigerant concentration value is greater than or equal to the preset refrigerant concentration value, the compressor 11 and the drying fan will stop running, and the induction coil 22 will be disconnected.

[0077] In step S232b, if the real-time refrigerant concentration value is less than the preset refrigerant concentration value, the compressor 11 is kept running.

[0078] With the above settings, when the real-time refrigerant concentration value is detected to be greater than or equal to the preset refrigerant concentration value, it indicates that there is a refrigerant leak. The electrical components of the dryer need to be turned off to prevent the electrical components from generating electric sparks during operation, which could ignite the refrigerant and cause a combustion or explosion accident.

[0079] It should be noted that steps S231b and S232b are executed in parallel; if one of them is executed, the other will not be executed.

[0080] In step S310, after executing step S232a or S232b, the real-time refrigerant temperature value at the outlet of compressor 11 is obtained through the third temperature sensor 73.

[0081] Step S320: Compare the real-time refrigerant temperature value with the first preset refrigerant temperature value.

[0082] In step S330, based on the comparison result of step S320, the operating state of compressor 11 is selectively controlled, and induction coil 22 is selectively disconnected.

[0083] Specifically, step S330 includes:

[0084] In step S331a, if the real-time refrigerant temperature value is greater than the first preset refrigerant temperature value, the compressor 11 is stopped and the induction coil 22 is disconnected.

[0085] In step S332a, if the real-time refrigerant temperature value is less than or equal to the first preset refrigerant temperature value, the compressor 11 is kept running.

[0086] With the above settings, when the real-time refrigerant temperature value is detected to be greater than the first preset refrigerant temperature value, it indicates that the refrigerant temperature at the outlet of the compressor 11 is too high. The compressor 11 needs to be stopped and the induction coil 22 needs to be disconnected to avoid the air temperature in the drying duct 3 being too high and damaging the clothes.

[0087] It should be noted that steps S331a and S332a above are steps that are executed in parallel. If one of them is executed, the other step will not be executed.

[0088] In some specific embodiments, step S330 includes:

[0089] In step S331b, if the real-time refrigerant temperature value is greater than or equal to the first preset refrigerant temperature value, the compressor 11 is stopped and the induction coil 22 is disconnected.

[0090] In step S332b, if the real-time refrigerant temperature value is less than the first preset refrigerant temperature value, the compressor 11 is kept running.

[0091] With the above settings, when the real-time refrigerant temperature value is detected to be greater than or equal to the first preset refrigerant temperature value, it indicates that the refrigerant temperature at the outlet of the compressor 11 is too high. The compressor 11 needs to be stopped and the induction coil 22 needs to be disconnected to avoid the air temperature in the drying duct 3 being too high and damaging the clothes.

[0092] It should be noted that steps S331b and S332b are executed in parallel; if one of them is executed, the other will not be executed.

[0093] In step S410, after executing step S331a or S331b, the real-time refrigerant temperature value at the outlet of compressor 11 is obtained again through the third temperature sensor 73.

[0094] Step S420: Compare the real-time refrigerant temperature value obtained again with the second preset refrigerant temperature value.

[0095] Step S430: Based on the comparison result of step S420, selectively execute the corresponding steps.

[0096] Specifically, step S430 includes:

[0097] In step S431a, if the real-time refrigerant temperature value obtained again is greater than the second preset refrigerant temperature value, then return to step S410.

[0098] In step S432a, if the real-time refrigerant temperature value obtained again is less than or equal to the second preset refrigerant temperature value, then return to step S100.

[0099] The second preset refrigerant temperature value is less than the first preset refrigerant temperature value.

[0100] With the above settings, when the real-time refrigerant temperature value is detected to be greater than the second preset refrigerant temperature value, it indicates that the refrigerant temperature at the outlet of compressor 11 is still too high. Compressor 11 needs to be stopped to cool down, so as to avoid the air temperature in the drying duct 3 being too high and damaging the clothes.

[0101] It should be noted that steps S431a and S432a are executed in parallel; if one of them is executed, the other will not be executed.

[0102] In some specific embodiments, step S430 includes:

[0103] In step S431b, if the real-time refrigerant temperature value obtained again is greater than or equal to the second preset refrigerant temperature value, then return to step S420.

[0104] In step S432b, if the real-time refrigerant temperature value obtained again is less than the second preset refrigerant temperature value, then return to step S100.

[0105] The second preset refrigerant temperature value is less than the first preset refrigerant temperature value.

[0106] With the above settings, when the real-time refrigerant temperature value is detected to be greater than or equal to the second preset refrigerant temperature value, it indicates that the refrigerant temperature at the outlet of compressor 11 is still too high. Compressor 11 needs to be stopped to cool down, so as to avoid the air temperature in the drying duct 3 being too high and damaging the clothes.

[0107] It should be noted that steps S431b and S432b are executed in parallel; if one of them is executed, the other will not be executed.

[0108] In step S510, after executing step S332a or S332b, the real-time ambient temperature value of the area surrounding the drying duct 3 is obtained through the second temperature sensor 72.

[0109] Step S520: Compare the real-time ambient temperature value with the preset ambient temperature value.

[0110] In step S530, based on the comparison result of step S520, the operating state of the induction coil 22 is selectively controlled.

[0111] Specifically, step S530 includes:

[0112] In step S531a, if the real-time ambient temperature value is greater than the preset ambient temperature value, the induction coil 22 is disconnected, and the process returns to step S210.

[0113] In step S532a, if the real-time ambient temperature value is less than or equal to the preset ambient temperature value, then the induction coil 22 is energized.

[0114] With the above settings, when the detected real-time ambient temperature value is greater than the preset ambient temperature value, it indicates that the air temperature inside the drying duct 3 is high, and there is no need to activate the electromagnetic induction heater 2 for auxiliary heating, thus preventing the air temperature inside the drying duct 3 from becoming too high. Conversely, when the detected real-time ambient temperature value is less than or equal to the preset ambient temperature value, it indicates that the air temperature inside the drying duct 3 is low, and the electromagnetic induction heater 2 needs to be activated for auxiliary heating, thereby improving heating efficiency.

[0115] It should be noted that steps S531a and S532a are executed in parallel; if one of them is executed, the other will not be executed.

[0116] In some specific embodiments, step S530 includes:

[0117] In step S531b, if the real-time ambient temperature value is greater than or equal to the preset ambient temperature value, the induction coil 22 is disconnected, and the process returns to step S210.

[0118] In step S532b, if the real-time ambient temperature value is less than the preset ambient temperature value, the induction coil 22 is energized.

[0119] With the above settings, when the detected real-time ambient temperature is greater than or equal to the preset ambient temperature, it indicates that the air temperature inside the drying duct 3 is high, and there is no need to activate the electromagnetic induction heater 2 for auxiliary heating, thus preventing the air temperature inside the drying duct 3 from becoming too high. Conversely, when the detected real-time ambient temperature is lower than the preset ambient temperature, it indicates that the air temperature inside the drying duct 3 is low, and the electromagnetic induction heater 2 needs to be activated for auxiliary heating, thereby improving heating efficiency.

[0120] It should be noted that steps S531b and S532b are executed in parallel; if one of them is executed, the other will not be executed.

[0121] In step S610, after executing step S532a or S532b, the real-time metal temperature value of the metal body 21 is obtained through the first temperature sensor 71.

[0122] Step S620: Compare the real-time metal temperature value with the preset metal temperature value.

[0123] In step S630, based on the comparison result of step S620, the induction coil 22 is selectively disconnected.

[0124] With the above settings, the temperature of the metal body 21 is detected by the first temperature sensor 71, and the energization state of the induction coil 22 is controlled based on the real-time metal temperature value of the metal body 21. This can prevent the temperature of the metal body 21 from becoming too high, thereby preventing the leaked refrigerant from being ignited due to high temperature, thus avoiding the risk of deflagration or explosion and improving the safety of the equipment.

[0125] Specifically, step S630 includes:

[0126] In step S631a, if the real-time metal temperature value is greater than the preset metal temperature value, the induction coil 22 is disconnected, and the process returns to step S210.

[0127] In step S632a, if the real-time metal temperature value is less than or equal to the preset metal temperature value, the induction coil 22 is kept energized, and the process returns to step S210.

[0128] With the above settings, when the real-time metal temperature value is detected to be greater than the preset metal temperature value, it indicates that the temperature of the metal body 21 is too high and the induction coil 22 needs to be disconnected to stop heating the metal body 21.

[0129] It should be noted that steps S631a and S632a are executed in parallel; if one of them is executed, the other will not be executed.

[0130] In some specific embodiments, step S630 includes:

[0131] In step S631b, if the real-time metal temperature value is greater than or equal to the preset metal temperature value, the induction coil 22 is disconnected, and the process returns to step S210.

[0132] In step S632b, if the real-time metal temperature value is less than the preset metal temperature value, the induction coil 22 is kept energized, and the process returns to step S210.

[0133] With the above settings, when the real-time metal temperature value is detected to be greater than or equal to the preset metal temperature value, it indicates that the temperature of the metal body 21 is too high and the induction coil 22 needs to be disconnected to stop heating the metal body 21.

[0134] It should be noted that steps S631b and S632b are executed in parallel; if one of them is executed, the other will not be executed.

[0135] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A heat pump dryer, the heat pump dryer comprising a drying air duct (3), characterized in that, The drying duct (3) is equipped with an auxiliary heating device (2), which includes a metal body (21) and an induction coil (22). The metal body (21) is disposed inside the drying duct (3), and the induction coil (22) is arranged around the drying duct (3) and corresponding to the metal body (21). The induction coil (22) is used to generate an alternating magnetic field to heat the metal body (21), thereby heating the air inside the drying duct (3).

2. The heat pump dryer according to claim 1, characterized in that, The heat pump dryer also includes a heat dissipation duct (5) and a cooling fan (6). The heat dissipation duct (5) is located around the drying duct (3). The air inlet and air outlet of the heat dissipation duct (5) are respectively connected to the outside of the heat pump dryer. The heat dissipation duct (5) and the induction coil (22) are arranged such that air can flow through the induction coil (22) when it is driven by the cooling fan (6).

3. The heat pump dryer according to claim 2, characterized in that, The heat pump dryer also includes a rear panel (4), on which a louvered air vent is provided. The air inlet and outlet of the heat dissipation duct (5) are connected to the external environment through the louvered air vent; and / or The induction coil (22) is completely enclosed within the heat dissipation duct (5).

4. The heat pump dryer according to claim 1, characterized in that, The metal body (21) is equipped with a first temperature sensor (71) for detecting the temperature of the metal body (21). The heat pump dryer also includes a controller, which is connected to the induction coil (22) and the first temperature sensor (71) respectively. The controller is configured to selectively control the energization state of the induction coil (22) based at least on the detection result of the first temperature sensor (71).

5. A control method for a heat pump dryer, characterized in that, The heat pump dryer is the heat pump dryer according to any one of claims 1 to 4, and the control method includes: After the induction coil (22) is energized, the real-time metal temperature value of the metal body (21) is obtained; The real-time metal temperature value is compared with the preset metal temperature value; Based on the comparison results, the induction coil (22) is selectively disconnected.

6. The control method for a heat pump dryer according to claim 5, characterized in that, The phrase "selectively disconnecting the induction coil (22) based on the comparison result" includes: If the real-time metal temperature value is greater than or equal to the preset metal temperature value, then the induction coil (22) is disconnected; If the real-time metal temperature value is less than or equal to or less than the preset metal temperature value, then the induction coil (22) is kept energized.

7. The control method for a heat pump dryer according to claim 6, characterized in that, The control method further includes: Before obtaining the real-time metal temperature value of the metal body (21), obtain the real-time ambient temperature value of the periphery of the drying air duct (3); The real-time ambient temperature value is compared with the preset ambient temperature value; If the real-time ambient temperature value is greater than or equal to the preset ambient temperature value, then the induction coil (22) is disconnected; If the real-time ambient temperature value is less than or equal to or less than the preset ambient temperature value, then the induction coil (22) is energized.

8. The control method for a heat pump dryer according to claim 7, characterized in that, The heat pump dryer also includes a compressor (11), and the control method further includes: Before obtaining the real-time ambient temperature value around the drying duct (3), obtain the real-time refrigerant temperature value at the outlet of the compressor (11); The real-time refrigerant temperature value is compared with the first preset refrigerant temperature value; If the real-time refrigerant temperature value is greater than or equal to the first preset refrigerant temperature value, then the compressor (11) will stop running and the induction coil (22) will be disconnected. If the real-time refrigerant temperature value is less than or equal to or less than the first preset refrigerant temperature value, then the compressor (11) shall continue to operate.

9. The control method for a heat pump dryer according to claim 8, characterized in that, The control method further includes: After the compressor (11) is stopped and the induction coil (22) is disconnected, the real-time refrigerant temperature value at the outlet of the compressor (11) is acquired again. The newly acquired real-time refrigerant temperature value is compared with the second preset refrigerant temperature value; If the real-time refrigerant temperature value obtained again is greater than or equal to the second preset refrigerant temperature value, then return to the step of obtaining the real-time refrigerant temperature value at the outlet of the compressor (11) again; If the real-time refrigerant temperature value obtained again is less than or equal to or less than the second preset refrigerant temperature value, then the compressor (11) is started. Wherein, the second preset refrigerant temperature value is less than the first preset refrigerant temperature value.

10. The control method for a heat pump dryer according to claim 8, characterized in that, The control method further includes: Before obtaining the real-time refrigerant temperature value at the outlet of the compressor (11), obtain the real-time refrigerant concentration value inside the drying duct (3) and / or outside the drying duct (3); Compare the real-time refrigerant concentration value with the preset refrigerant concentration value; If the real-time refrigerant concentration value is greater than or equal to the preset refrigerant concentration value, then at least the compressor (11) will stop running and the induction coil (22) will be disconnected; If the real-time refrigerant concentration value is less than or equal to or less than the preset refrigerant concentration value, then the compressor (11) shall continue to operate.

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