Drying control method of clothes dryer and clothes dryer

Abstract

The invention discloses a drying control method of a clothes dryer and the clothes dryer, and belongs to the technical field of clothes dryers. The drying control method of the clothes dryer comprises the steps that the temperature of air in a clothes drying cylinder of the clothes dryer is monitored, and the humidity of air obtained after condensation and dehumidification in the internal circulation process is monitored; when the air temperature is smaller than T1 and the air humidity is larger than R1, the working medium proportion of a compressor in the clothes dryer is set as follows: propylene: isobutane = (55-60): (40-45); when the air temperature is T2-T3 and the air humidity is R2-R3, the working medium proportion of a compressor in the clothes dryer is set as that propylene: isobutane = (40-45): (55-60); and when the air temperature is T4-T5 and the air humidity is R4-R5, the humidity decreasing rate, the temperature increasing rate and the drying time for the air humidity to reach R6 are calculated, the clothes type is recognized, the working medium proportion of a compressor in the clothes dryer is adjusted according to the clothes type, and the clothes drying effect and efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clothes drying machines, in particular to a drying control method of a clothes drying machine and the clothes drying machine. BACKGROUND

[0002] With the improvement of people's living standards, clothes drying machines, as a kind of household appliances, are widely welcomed because they can quickly and efficiently dry clothes. Traditional clothes drying machines mainly generate heat through heating elements (such as electric heating wires or heat pump systems), and then transfer the heat to the clothes through an air circulation system to achieve the drying of the clothes. Although this drying method meets the needs of users to some extent, there are still many problems in actual use.

[0003] After searching, the existing Chinese patent CN112011979B provides a drying control method of a clothes drying machine and the clothes drying machine. After the clothes drying machine is turned on, the state of the clothes in the drying drum is detected, the state of the clothes in the drying drum is judged according to the temperature value change state of the air outlet of the drying drum and the detected humidity value of the clothes in the drying drum, and different drying processes are controlled according to different clothes states to make the drying control of the clothes drying machine more accurate.

[0004] The above-mentioned scheme can control different drying processes according to different clothes states, but it is difficult to balance the heat exchange requirements at different stages of the drying process, and the drying cycle is prolonged. In view of this, we propose a drying control method of a clothes drying machine and the clothes drying machine. SUMMARY

[0005] 1. Technical problem to be solved The purpose of the present application is to provide a drying control method of a clothes drying machine and the clothes drying machine to solve the problems raised in the background art.

[0006] 2. Technical solution The present application is realized by the following technical solution: A drying control method of a clothes drying machine, comprising the following steps: S1, monitoring the air temperature in the drying drum of the clothes drying machine and the air humidity after condensation and dehumidification in the internal circulation process, and setting the drying mode of the clothes drying machine to internal circulation; S2, when the air temperature is less than T1 and the air humidity is greater than R1, the working medium ratio of the compressor in the clothes drying machine is set as: propylene:isobutane=(55-60):(40-45); S3, when the air temperature is T2-T3 and the air humidity is R2-R3, the working medium ratio of the compressor in the clothes drying machine is set as: propylene:isobutane=(40-45):(55-60); S4, when the air temperature is T4-T5 and the air humidity is R4-R5, calculate the humidity drop rate, the temperature rise rate and the drying time for the air humidity to reach R6; identify the clothes type according to the humidity drop rate, the temperature rise rate and the drying time for the air humidity to reach R6, and adjust the working medium proportion of the compressor in the clothes dryer according to the clothes type; S5, when the air temperature is greater than T6 and the air humidity is less than R7, set the working medium proportion of the compressor in the clothes dryer as: propylene: isobutane = (50-55) : (45-50).

[0007] As an optional solution of the technical scheme of the present application, in step S5, if the humidity drop rate is less than 1.5% / min, the humidity drop rate is less than 0.8℃ / min, and the drying time for the air humidity to reach R6 is greater than 25min, the clothes type is identified as a first type of clothes, and the working medium proportion of the compressor in the clothes dryer is set as: propylene: isobutane = (45-50) : (50-55); If the humidity drop rate is 1.5-2.5% / min, the humidity drop rate is 0.6-1℃ / min, and the drying time for the air humidity to reach R6 is 18-25min, the clothes type is identified as a second type of clothes, and the working medium proportion of the compressor in the clothes dryer is set as: propylene: isobutane = (50-55) : (45-50); If the humidity drop rate is greater than 2.5% / min, the humidity drop rate is greater than 1.2℃ / min, and the drying time for the air humidity to reach R6 is greater than 25min, the clothes type is identified as a third type of clothes, and the working medium proportion of the compressor in the clothes dryer is set as: propylene: isobutane = (40-45) : (55-60).

[0008] As an optional solution of the technical scheme of the present application, T1 and T2 are 30℃, T3 is 30℃, T4 is 45℃, T5 is 55℃, T6 is 40℃, R1 is 70%, R2 is 50%, R3 is 70%, R4 is 30%, R5 is 50%, R6 is 50%, and R7 is 30%.

[0009] As an optional solution of the technical scheme of the present application, steps S2, S3 and S4 all adopt internal circulation, and the air discharged from the drying drum is dehumidified by the evaporator and the regenerator, heated by the condenser, and then re-discharged into the drying drum.

[0010] As an optional solution of the technical scheme of the present application, the step S5 adopts intermittent setting of internal circulation and external circulation; in the internal circulation stage, the air discharged from the drying drum is re-discharged into the drying drum after being dehumidified by the evaporator, the heat exchanger and heated by the condenser; in the external circulation stage, the external air is discharged into the drying drum after being dehumidified by the evaporator, the heat exchanger and heated by the condenser.

[0011] As an optional solution of the technical scheme of the present application, the air temperature in the drying drum is controlled at 48-55℃ when the clothes of the first type are dried; the air temperature in the drying drum is controlled at 50-55℃ when the clothes of the second type are dried; the air temperature in the drying drum is controlled at 45-48℃ when the clothes of the third type are dried.

[0012] As an optional solution of the technical scheme of the present application, the air temperature in the drying drum is controlled at 40-45℃ in the step S5.

[0013] A clothes dryer comprises a refrigerant channel and an air channel, the refrigerant channel is provided with a mixed working medium, and the mixed working medium comprises propylene and isobutane. The two ends of the refrigerant channel are connected with the inlet and outlet of a compressor, respectively, and the outlet and the inlet of the refrigerant channel are sequentially provided with a condenser, an electronic expansion valve and an evaporator, and the outlet of the condenser and the outlet of the evaporator are provided with a heat exchanger. The outlet of the air channel is connected with a circulating fan, the output end of the circulating fan is connected with the air inlet of a drying drum, the inlet of the air channel is connected with a control valve, the control valve is used to switch the communication state between the inlet of the air channel and the air exhaust of the drying drum and external air, and the inlet and the outlet of the air channel are sequentially connected with the evaporator, the heat exchanger and the condenser. The drying drum is provided with a temperature sensor, and the air channel is provided with a humidity sensor, and the humidity sensor is arranged between the heat exchanger and the evaporator.

[0014] 3. Beneficial effects Compared with the prior art, the present application has the following beneficial effects: 1) The clothes type is identified by the humidity and temperature change characteristic parameters, the drying temperature, the working medium ratio and the running intensity are adjusted accordingly, the drying time is shortened, and the problems such as incomplete drying of cotton clothes, deformation of wool clothes at high temperature and over-drying and aging of chemical fiber clothes are avoided, and the loftiness and softness of the clothes after drying are improved.

[0015] 2) The present application adopts intermittent external circulation in the low-humidity setting stage to supplement fresh air and discharge residual moisture and odor, thereby solving the problem of odor generation in traditional internal circulation clothes dryers.

[0016] 3) The mixed working medium used in the application is a low-GWP environmentally friendly working medium, which meets environmental protection requirements; it is suitable for domestic and commercial scenarios such as households, hotels, and laundry rooms, and can handle various types of clothing such as cotton, chemical fibers, and wool, with strong versatility. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a flow chart of a drying control method of a clothes dryer; Figure 2 is a logic block diagram of a clothes dryer; In the figure: 1, compressor; 2, condenser; 3, heat exchanger; 4, electronic expansion valve; 5, evaporator; 6, circulating fan; 7, drying drum. DETAILED DESCRIPTION

[0018] The technical solutions of the application will be described below in conjunction with the drawings.

[0019] Example 1 Please refer to Figure 1 , the drying control method of the clothes dryer comprises the following steps: S1, monitor the air temperature in the drying drum 7 of the clothes dryer and the humidity of the air after condensation and dehumidification in the internal circulation process, and set the drying mode of the clothes dryer to internal circulation; the air discharged from the drying drum 7 is dehumidified by the evaporator 5 and the heat exchanger 3, heated by the condenser 2, and then re-discharged into the drying drum 7; S2, when the air temperature is less than 30℃ and the air humidity is greater than 70%, the working medium ratio of the compressor in the clothes dryer is set as: propylene: isobutane = (55-60):(40-45); S3, when the air temperature is 30℃-35℃ and the air humidity is 50%-70%, the working medium ratio of the compressor in the clothes dryer is set as: propylene: isobutane = (40-45):(55-60); S4, when the air temperature is 45℃-55℃ and the air humidity is 30%-50%, calculate the humidity drop rate, temperature rise rate, and drying time required for the air humidity to reach 50%; identify the type of clothing according to the humidity drop rate, temperature rise rate, and drying time required for the air humidity to reach 50%, and adjust the working medium ratio of the compressor in the clothes dryer according to the type of clothing; If the humidity drop rate is less than 1.5% / min, the humidity drop rate is less than 0.8℃ / min, and the drying time required for the air humidity to reach R6 is greater than 25min, the type of clothing is identified as a first type of clothing, and the working medium ratio of the compressor in the clothes dryer is set as: propylene: isobutane = (45-50):(50-55); If the humidity drop rate is 1.5-2.5% / min, the humidity drop rate is 0.6-1℃ / min, and the drying time for the air humidity to reach R6 is 18-25 min, the clothes are identified as the second type of clothes, and the working medium ratio of the compressor in the clothes dryer is set to: propylene: isobutane = (50-55):(45-50); If the humidity drop rate is greater than 2.5% / min, the humidity drop rate is greater than 1.2℃ / min, and the drying time for the air humidity to reach R6 is greater than 25 min, the clothes are identified as the third type of clothes, and the working medium ratio of the compressor in the clothes dryer is set to: propylene: isobutane = (40-45):(55-60); The air temperature in the drying drum 7 during drying of the first type of clothes is controlled at 48-55℃; the air temperature in the drying drum 7 during drying of the second type of clothes is controlled at 50-55℃; and the air temperature in the drying drum 7 during drying of the third type of clothes is controlled at 45-48℃.

[0020] The first type of clothes, the second type of clothes, and the third type of clothes correspond to cotton clothes, chemical fiber clothes, and wool clothes, respectively.

[0021] S5, when the air temperature is greater than 40℃ and the air humidity is less than 30%, the working medium ratio of the compressor in the clothes dryer is set to: propylene: isobutane = (50-55):(45-50); and the drying mode of the clothes dryer is adjusted to intermittent setting between internal circulation and external circulation. In the internal circulation stage, the air discharged from the drying drum 7 is dehumidified by the evaporator 5, the regenerator 3, and the condenser 2, and then reheated and discharged into the drying drum 7. In the external circulation stage, the external air is dehumidified by the evaporator 5, the regenerator 3, and the condenser 2, and then discharged into the drying drum 7, keeping the air temperature in the drying drum 7 at 40-45℃.

[0022] In the method, step S2 is a preheating stage, which preferentially heats up quickly, and the working medium ratio is adjusted to the highest proportion of propylene (55-60%), taking advantage of its high heating efficiency; the compressor 1 operates at a high frequency (50-60Hz), the electronic expansion valve 4 is opened at 60-70%, the internal and external circulation switching valve maintains internal circulation, and the circulating fan 6 operates at a medium-high speed (1200-1500r / min), shortening the heating time; Step S3 is a high-humidity rapid dehumidification stage, which preferentially intensifies dehumidification, and the working medium ratio is adjusted to the highest proportion of isobutane (55-60%), taking advantage of its low-temperature heat exchange advantage; the compressor 1 maintains a high frequency (45-55Hz), the electronic expansion valve 4 is opened at 0-80%, the internal and external circulation switching valve maintains internal circulation, and the circulating fan 6 operates at a high speed (1500-1800r / min), accelerating the flow and condensation of moist air; Step S4 is the medium-humidity deep drying stage, balancing dehumidification and temperature increase, and precisely adjusting according to the type of clothing: Cotton clothing: Acrylic:Isobutane = (45-50):(50-55), temperature 48-55℃, compressor 1 medium frequency (35-45Hz) to ensure deep dehumidification; For synthetic fiber clothing: propylene:isobutane = (50-55):(45-50), temperature 50-55℃, compressor 1 medium frequency (30-40Hz) to improve drying efficiency; Wool garments: Propylene:Isobutane = (40-45):(55-60), temperature 45-48℃, compressor 1 low to medium frequency (25-35Hz), avoid high temperature damage; For mixed-material garments: Follow the adjustment parameters for wool or cotton, prioritizing garment safety.

[0023] Step S5 is the low-humidity setting stage, prioritizing setting and energy saving. Propylene:isobutane = (50-55):(45-50) to maintain efficient heating. Compressor 1 operates at low frequency (20-30Hz), and electronic expansion valve 4 is opened at 50-60%. The internal and external circulation is switched to intermittent external circulation (1 minute external circulation + 5 minutes internal circulation) to replenish fresh air and avoid odors. The circulating fan 6 operates at low speed (800-1200 r / min), and the temperature is maintained at 40-45℃ for slow cooling and setting until RH≤15% and then stops operating.

[0024] Example 2: like Figure 2 As shown, this embodiment provides a clothes dryer, which adopts a drying control method for a clothes dryer as disclosed in Embodiment 1, including a refrigerant channel and an air channel. The refrigerant channel is provided with a mixed working fluid, which includes propylene and isobutane. The two ends of the refrigerant passage are respectively connected to the inlet and outlet of the compressor 1. A condenser 2, an electronic expansion valve 4 and an evaporator 5 are installed sequentially between the outlet and the inlet of the refrigerant passage. A regenerator 3 is installed at the outlet of the condenser 2 and the outlet of the evaporator 5. A circulating fan 6 is connected to the outlet of the air passage. The output end of the circulating fan 6 is connected to the air inlet of the dryer 7. A control valve is connected to the inlet of the air passage. The control valve is used to switch the connection between the air passage inlet and the dryer 7 exhaust port and the outside air. The air passage inlet and outlet are connected in sequence to the evaporator 5, the regenerator 3, and the condenser 2. The clothes dryer 7 is equipped with a temperature sensor, and the air channel is equipped with a humidity sensor. The humidity sensor is located between the regenerator 3 and the evaporator 5.

[0025] In the scheme, the compressor 1 compresses the mixed working medium, injects into the condenser 2, uses the mixed working medium to condense in the condenser 2 to release heat, and heats the dehumidified air in the air passage; The mixed working medium discharged from the condenser 2 flows into the evaporator 5 through the electronic expansion valve 4, and the electronic expansion valve 4 controls the proportion of the mixed working medium by adjusting the opening degree; The mixed working medium in the evaporator 5 evaporates and absorbs heat, and dehumidifies the air in the air passage; The mixed working medium discharged from the evaporator 5 can exchange heat with the mixed working medium discharged from the condenser 2 in the regenerator 3, realize the recovery of heat, and finally inject into the input end of the compressor 1, realize the circulation of the mixed working medium.

Claims

1. A drying control method for a clothes dryer, characterized in that: Includes the following steps: S1. Monitor the air temperature inside the dryer drum (7) and the air humidity after condensation and dehumidification during the internal circulation process, and set the drying mode of the dryer to internal circulation. S2. When the air temperature is less than T1 and the air humidity is greater than R1, set the working fluid ratio of the compressor inside the dryer to: Propylene:isobutane = (55-60):(40-45); S3. When the air temperature is T2-T3 and the air humidity is R2-R3, set the working fluid ratio of the compressor inside the dryer to: Propylene:isobutane = (40-45):(55-60); S4. When the air temperature is T4-T5 and the air humidity is R4-R5, calculate the rate of humidity decrease, the rate of temperature increase, and the drying time required for the air humidity to reach R6; based on the rate of humidity decrease, the rate of temperature increase, and the drying time required for the air humidity to reach R6, identify the type of clothing and adjust the working fluid ratio of the compressor in the dryer according to the type of clothing. S5. When the air temperature is greater than T6 and the air humidity is less than R7, set the refrigerant ratio of the compressor inside the dryer to: Propylene:Isobutane = (50-55):(45-50).

2. The drying control method for a clothes dryer according to claim 1, characterized in that: In step S5, if the humidity decrease rate is less than 1.5% / min, the humidity decrease rate is less than 0.8℃ / min, and the drying time required to reach R6 humidity is greater than 25 minutes, then the clothing category is identified as Category 1 clothing, and the working fluid ratio of the compressor in the dryer is set as follows: Propylene:isobutane = (45-50):(50-55); If the humidity decrease rate is 1.5-2.5% / min, the humidity decrease rate is 0.6-1℃ / min, and the drying time required to reach R6 humidity is 18-25 minutes, then the clothing category is identified as Category II clothing, and the working fluid ratio of the dryer compressor is set as follows: Propylene:isobutane = (50-55):(45-50); If the humidity decrease rate is greater than 2.5% / min, the humidity decrease rate is greater than 1.2℃ / min, and the drying time required to reach R6 humidity is greater than 25 minutes, then the clothing category is identified as Category III clothing, and the working fluid ratio of the dryer's compressor is set as follows: Propylene:Isobutane = (40-45):(55-60).

3. The drying control method for a clothes dryer according to claim 1, characterized in that: The values ​​of T1 and T2 are 30℃, T3 is 30℃, T4 is 45℃, T5 is 55℃, and T6 is 40℃; the values ​​of R1 are 70%, R2 is 50%, R3 is 70%, R4 is 30%, R5 is 50%, R6 is 50%, and R7 is 30%.

4. The drying control method for a clothes dryer according to claim 1, characterized in that: Steps S2, S3 and S4 all use internal circulation. The air discharged from the dryer drum (7) is dehumidified by the evaporator (5) and the regenerator (3), and heated by the condenser (2) before being discharged back into the dryer drum (7).

5. The drying control method for a clothes dryer according to claim 1, characterized in that: Step S5 uses an intermittent setting of internal and external circulation. In the internal circulation stage, the air discharged from the dryer drum (7) is dehumidified by the evaporator (5) and the regenerator (3) and heated by the condenser (2) before being discharged back into the dryer drum (7). In the external circulation stage, external air is dehumidified by the evaporator (5) and the regenerator (3) and heated by the condenser (2) before being discharged into the dryer drum (7).

6. The drying control method for a clothes dryer according to claim 2, characterized in that: When drying the first type of clothing, the air temperature inside the drying drum (7) is controlled at 48-55℃; when drying the second type of clothing, the air temperature inside the drying drum (7) is controlled at 50-55℃; when drying the third type of clothing, the air temperature inside the drying drum (7) is controlled at 45-48℃.

7. The drying control method for a clothes dryer according to claim 1, characterized in that: In step S5, the air temperature inside the clothes dryer (7) is controlled at 40-45℃.

8. A clothes dryer, employing the drying control method for a clothes dryer according to any one of claims 1-7, characterized in that: It includes a refrigerant passage and an air passage, wherein the refrigerant passage contains a mixed working fluid, the mixed working fluid including propylene and isobutane; The two ends of the refrigerant passage are connected to the inlet and outlet of the compressor (1) respectively. A condenser (2), an electronic expansion valve (4) and an evaporator (5) are installed between the outlet and the inlet of the refrigerant passage. A regenerator (3) is installed at the outlet of the condenser (2) and the outlet of the evaporator (5). A circulating fan (6) is connected to the outlet of the air channel. The output end of the circulating fan (6) is connected to the air inlet of the dryer (7). A control valve is connected to the inlet of the air channel. The control valve is used to switch the connection state between the air channel inlet and the dryer (7) exhaust port and the outside air. The air channel inlet and outlet are connected to the evaporator (5), the regenerator (3), and the condenser (2) in sequence. The clothes dryer (7) is equipped with a temperature sensor, and the air channel is equipped with a humidity sensor. The humidity sensor is located between the regenerator (3) and the evaporator (5).

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