TR201602419A1 - WASHING DRYER WITH A HEAT PUMP AND THE METHOD USED FOR CONTROL - Google Patents

Abstract

The present invention includes a heat pump laundry dryer (1) comprising a drum (2), a recirculating air circuit (3), a refrigerant circuit (4) having a compressor (5), and a control unit (6) for performing the drying operation. is about. The heat pump tumble dryer (1) of the present invention further comprises a fan (7) for cooling the compressor (5) and a sensor (8) sensing the recirculating air temperature (T_air), the control unit (6) being equal to or equal to 55 ° C. determines a lower first threshold temperature (T_th1) and a second threshold temperature (T_th2) lower than the first threshold temperature (T_th1), and before the end of the drying process, the fan (7) when the air temperature T_air reaches the first threshold temperature (T_th1). It initiates a cooling operation in which it is turned ON and the fan 7 is turned OFF when the recirculated air temperature T_air drops to the second threshold temperature T_th2.

Description

DESCRIPTION IN A HEAT PUMP WASHER DRYER AND CONTROL METHOD USED This invention is a dryer with a heat pump and a laundry with a heat pump. It is related to the dryer control method. such as heat pump dryers and condensing dryers. ventless laundry dryers are known in the art. This type of laundry In dryers, laundry usually absorbs moisture from the rotating drum. It is dried by passing hot cycle air taken from it. Heat pump technology, an energy efficient laundry drying method offers. A heat pump laundry dryer is usually reciprocally a recirculating air circuit arranged to exchange heat and a It includes the refrigerant circuit. The loop air circuit, the loop air, a channel that allows it to be circulated from the drum with the help of a fan inside contains. The refrigerant circuit is serialized to circulate the refrigerant. an evaporator, a compressor, a condenser and a It includes an expansion valve or a capillary tube. Evaporator and condenser, cycle to dehumidify and heat the cycle air inside the duct It exchanges heat with the air. The heat absorbed by the evaporator, It is partially returned to the cycle air with the help of the condenser. This In this way, the drying performance of the tumble dryer is improved.

A problem with the drying process is that when the laundry is completely dried, the risk of sudden ignition of the laundry is increased. For this reason, the IEC According to the standards, the drying process should be done in order to reduce the risk of fire. After it is finished, the temperature of the laundry should be lowered. In particular, a cooling started after the drying process has ended. In the process, it is recommended to reduce the temperature of the recirculated air below 55°C. is being done.

In accordance with the above-mentioned safety instruction, the circuit air circuit and refrigerant circuit, especially the recirculated air fan inside the duct and compressor motor continues to run during this cooling process.

However, as a result, the processing time is prolonged and the total energy consumption is increased. increasing. Generally, the duration of the cooling process varies according to the conditions. and cannot be predicted with certainty. Therefore, the displayed forecast The processing time often differs from the actual processing time.

As a result, customer satisfaction decreases.

The aim of this invention is to overcome the above mentioned disadvantages of the prior art. energy efficient and reliable operation that eliminates a dryer with a heat pump and a washing machine with a heat pump, which makes it possible is the realization of the dryer control method.

For this purpose, the heat pump laundry dryer and Istem Site It can be reached with the defined heat pump laundry dryer control method.

Subject of the invention, which is defined respectively in the claims attached to further developments achieved with the help of

The subject of the invention is the heat pump laundry dryer, cooling the compressor. A fan that provides With a first threshold temperature T_thl less than or equal to 55°C A second threshold temperature lower than T_thl, sets T_th2 and drying Before the end of operation, when T_air reaches T_th1°, the compressor when the cooling fan is turned ON and T_air falls to T_th2 a cooling operation in which the compressor cooling fan is turned OFF It includes a control unit that starts up.

Thanks to this invention, the temperature of the laundry can be controlled by the drying process. before it expires, it can be lowered below 55°C. Like this, After the drying process is finished, an additional cooling process eliminating the need for implementation. Thanks to this invention, Prolongation of the total operating time of the tumble dryer is prevented.

Thus, energy consumption is reduced and energy efficiency is improved.

Thanks to this invention, the risk of fire is eliminated or as much as possible. is reduced and therefore security is improved. Thus, the consumer satisfaction is increased.

In one embodiment of the invention, the cooling process is pre-empted by the user. select a predetermined drying program or It starts when any of the expiration conditions are met.

In another embodiment of the invention, T_air is yet to T_thl level. not reached, before the start of the cooling operation or before the cooling operation After starting, an additional cooling process is started. Additional cooling In the process, the refrigerant temperature T_rfg has an upper threshold and a lower threshold. The refrigerant temperature is T_rfg, to ensure that the value is kept between Turn the compressor cooling fan ON or OFF as appropriate. is turned on and/or the compressor motor is turned ON or OFF. brought or operated at higher or lower speeds.

The precautions regarding the compressor motor in the additional cooling process are similar. It can also be applied in the cooling process.

In another embodiment of the invention, the cycle air temperature T_air, cycle an air filter located in the air circuit downstream of the drum. measured nearby.

The subject of the invention is a laundry dryer with a steam heat pump and a heat pump. Other advantages of the tumble dryer control method are the applications in the appendix. will be explained with reference to the figures; from the aforementioned Figure 1 shows a heat pump laundry dryer in one embodiment of the invention. sematic view.

Figure 2 is an embodiment of the invention with a heat pump laundry dryer. is the flowchart showing the steps of the control method.

Figure 3, in one embodiment of the invention, is a heat pump laundry dryer. is the flowchart showing the steps of the control method.

The parts in the figures are numbered one by one. laundry dryer drum loop air circuit refrigerant circuit Compressor Control unit You ask You ask Circle air fan condenser expansion element 14. Evaporator T_rfg: Coolant temperature T_thl: First threshold recirculation air temperature T_th2: Second threshold cycle air temperature T_th3: Third threshold cycle air temperature T_th4: Fourth threshold cycle air temperature A: Additional cooling passing the dehumidified hot recirculated air through the drum (2). A loop (10) and a recirculating air which is in the duct (10) a recirculated air circuit (3) having a fan (l 1); of the cycle air which dehumidifies, heats the dehumidified circuit air and uses a refrigerant compressor (5), a condenser (12), a capillary tube or an expansion valve an expansion element (13) and an evaporator (14), such as refrigerant circuit (4) and a control that performs the drying process unit (6).

The subject of the invention is the heat pump laundry dryer (1), moreover, the compressor (5) a fan (7) that provides cooling and the recirculated air temperature (T_air) contains a sensor (8) that detects, the control unit (6) is equal to 55°C or first threshold with a lower first threshold temperature (T_thl) a second threshold temperature (T_th2) that is lower than the temperature (T_thl) and before the end of the drying process, the recirculated air Turn ON the fan (7) when its temperature (T_air) reaches the first threshold temperature (T_thl). position and the recirculated air temperature (T_air) is set to the second threshold temperature. A cooling system where the fan (7) is turned OFF when (T_th2) falls. starts the process (Figure 1 to Figure 3).

In one embodiment of the invention, the control unit 6 is furthermore predetermined via the interface (not shown in the figures). when you select a drying program or after the start of the drying process it starts the cooling process after a predetermined time has passed. This in one version of the application, said drying program until your laundry reaches a dryness level suitable for ironing. It is a dry program. In another version of this application, the word The predetermined time is less than the total time of the drying program. is short.

In another embodiment of the invention, the heat pump laundry dryer (1) also It includes a sensor (9) that detects the refrigerant temperature (T_rfg). find it In this embodiment, the control unit (6) also sets a third threshold temperature. (T_th3) with a temperature equal to or lower than the third threshold temperature (T_th3). the fourth threshold temperature (T_th4) is set and the cooling process starts. recirculated air temperature (T_air) before or after cooling has started While the first threshold temperature (Týthl) has not yet been reached, the refrigerant temperature Turn ON the fan (7) when (T_rfg) exceeds the third threshold temperature (T_th3). and the refrigerant temperature (T_rfg) is the fourth threshold temperature (T_th4). when the fan (7) is turned OFF, there is additional cooling. starts the process (A).

In another embodiment of the invention, the recirculating air circuit (3) is connected to the drum (2). an air filter located downstream (not shown in the figures) contains. In this application, it detects the recirculating air temperature (T_air). The sensor (8) is located near the air filter. It includes a step (S1) in which the drying process is started with

The control method of the invention also requires a temperature less than or equal to 55°C. first threshold temperature (T_thl) and smaller than first threshold temperature (T_thl) a second threshold temperature (T_th2), which is Before the end of the cycle, by measuring the cycle air temperature (T_air), the cycle the compressor when the air temperature (T_air) reaches the first threshold temperature (T_thl) the cooling fan (7) is turned ON and the recirculated air temperature is When (T_air) drops to the second threshold temperature (T_th2), the compressor cooling fan (7) A chiller with steps (S3 to S6) where it is turned OFF It contains a step (SZ) in which the process is started.

In another embodiment of the invention, at the initialization step (SZ), the user when you select a specified drying program or After a predetermined time has elapsed after the start of the cooling operation is being launched.

In another embodiment of the invention, the control method is also While its temperature (T_air) has not yet reached the first threshold temperature (T_thl), before the start of the cooling operation or after the cooling operation has started then, a third threshold temperature (Tth3) equals the third threshold temperature (T_th3). or a lower fourth threshold temperature (T_th4) is determined steps (S7, S9) and refrigerant temperature (T_rfg) are detected, refrigerant the compressor when its temperature (Týrfg) exceeds the third threshold temperature (Týth3). refrigerant temperature (T_rfg) at which the cooling fan (7) is turned ON When it falls below the fourth threshold temperature (T_thr4), the compressor cooling an appendix with steps (S7 to 810) where the fan (7) is turned OFF It includes the steps (SZ-S3) in which the cooling process (A) is started (Fig. 1 to Figure 2

Claims (7)

REQUESTS l. A drum (2) in which the laundry is placed; a recirculated air circuit (3) which allows dehumidified hot recirculated air to be passed through the drum (2); A fan (7) that cools the compressor (5), which includes a refrigerant circuit (4) that dehumidifies the circulation air, heats the dehumidified cycle air and has a refrigerant compressor (5), and a control unit (6) that performs the laundry drying process, A sensor (8) that detects the recirculated air temperature (T_air) and a first threshold temperature (T_thl) equal to or lower than 55°C and a second threshold temperature (T_th2) lower than the first threshold temperature (T_thl) before the end of the control unit, which initiates a cooling unit operation in which the fan (7) is turned ON when the recirculated air temperature (T_air) reaches the first threshold temperature (T_thl) and the fan 7 is turned OFF when the recirculated air temperature (T_air) drops to the second threshold temperature (T_th2). A heat pump laundry dryer (1) characterized by (6). 2. A heat pump laundry dryer (1) as in Claim 1, characterized by a control unit (6) that starts the cooling process when the user selects a predetermined drying program or after a predetermined time has passed after the start of the drying process. 3. A sensor (9) that detects the refrigerant temperature (T_rfg) and a third threshold temperature (T_th3) determines a fourth threshold temperature (T_th4) equal to or lower than the third threshold temperature (T_th3) and before cooling starts or cooling process starts then, when the refrigerant temperature (T_rfg) exceeds the third threshold temperature (T_th3), the fan (7) is turned ON and the refrigerant temperature (T_rfg) goes down to the fourth lower threshold (T_rf4) while the recirculating air temperature (T_air) has not yet reached the first threshold temperature (T_thl). on the other hand, a heat pump laundry dryer (l) as in Claim 1 or 2, characterized by a control unit (6) that initiates an additional cooling process (A) in which the fan (7) is turned OFF. 4. As in any one of Claims 1 to 3, characterized by a recirculated air circuit (3) containing an air filter located downstream of the drum (2) and a sensor (8) that detects the recirculated air temperature (T_air) and is located near the air filter. a heat pump laundry dryer (l). 5. A first threshold temperature (T_thl) less than or equal to - 55°C and a first threshold used in the control of a heat pump laundry dryer (1), which includes - a step (Sl) in which the drying process is started, in which the laundry is dried with recirculated air When a second threshold temperature (T_th2), which is lower than the temperature (T_thl), is determined and before the drying process ends, the recirculated air temperature (T_air) is measured, and the compressor is turned ON when the recirculation air temperature (T_air) reaches the first threshold temperature (T_thl). A method characterized by a step (SZ) in which a cooling process is started, including steps (S3 to 56) where the compressor cooling fan (7) is turned OFF when the recirculating air temperature (T_air) drops to the second threshold temperature (T_th2). 6. A control method as in Claim 5, characterized by the start step (SZ) in which the cooling process is started when the user selects a predetermined drying program or after a predetermined time has elapsed after the start of the drying process. 7. A third threshold temperature (T_air) and a third threshold temperature (T_th3) are lower than or equal to the third threshold temperature (T_th3) before the start of the cooling operation or after the cooling operation, while the recirculating air temperature (T_air) has not yet reached the first threshold temperature (T_thl). Steps where (T_th4) is determined (S7, S9) and the refrigerant temperature (T_rfg) is detected, when the refrigerant temperature (T_rfg) exceeds the third threshold temperature (T_th3), the compressor cooling fan (7) is turned ON, the refrigerant temperature (T_rf_g) is turned ON, the fourth temperature of the refrigerant (T_rf_g) A method as in claim 5 or 6, which includes steps (S7 to 510) where the compressor cooling fan (7) is turned OFF when it goes below ) and steps (SZ-S3) in which an additional cooling process (A) is started.