Control method for improving drying uniformity of heat pump clothes dryer

Abstract

The invention discloses a control method for improving the drying uniformity of a heat pump clothes dryer, and relates to the technical field of clothes dryers, and the control method specifically comprises the following steps: dividing the drying of the clothes dryer into three stages, firstly setting switching data of the clothes dryer in different drying stages, namely running time T, switching time A and switching humidity H, and in the first stage, setting the switching data of the clothes dryer in the different drying stages, namely the running time T, the switching time A and the switching humidity H; an inner barrel of the clothes dryer operates according to the rotating and stopping beat a; when the running time T is larger than A, a second stage is started, and in the second stage, the inner barrel of the clothes dryer runs according to the rotating and stopping beat b; when the running time T is larger than A and the detected humidity value RH1 of the clothes is smaller than or equal to H, a third stage is entered, and in the third stage, an inner barrel of the clothes dryer runs according to the rotating and stopping beat c; in the drying process of the heat pump clothes dryer, the rotating and stopping rhythm of the inner barrel is adjusted by detecting the sampling value of the humidity sensor, so that the distribution of clothes in the clothes dryer is adjusted, and finally the drying uniformity of the clothes is improved.

Description

Technical Field

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

[0002] A clothes dryer is a modern household appliance designed to dry clothes quickly and efficiently. It uses the principle of hot air circulation to generate warm airflow through a built-in heating element. These airflows circulate in a closed drum, taking away moisture from the clothes, thereby achieving a fast drying effect.

[0003] The dryer not only greatly shortens the time of drying clothes, but is also particularly suitable for use in rainy or cold and humid weather, ensuring that clothes always remain dry and comfortable. At the same time, it also has a variety of drying modes and temperature settings, which can be personalized according to clothes of different materials and thicknesses, effectively protecting clothing fibers and avoiding shrinkage, deformation or damage.

[0004] In addition, some high-end dryers are equipped with intelligent sensing systems that can automatically detect the humidity of clothes and adjust the drying time, which is energy-saving and worry-free. With the advancement of technology, dryers have become one of the indispensable electrical appliances in modern families, bringing great convenience to people's lives.

[0005] At present, most heat pump dryers on the market have the inner drum running in one direction for a long time, and the reversing time is very short, which makes it easy for clothes to pile up in the drum, or for large clothes to wrap small clothes. This can easily cause the clothes on the surface to be dried, but the clothes wrapped inside are still wet, and the drying uniformity is poor, affecting the user experience. In response to this situation, some heat pump dryer manufacturers have adopted the approach of appropriately reducing the forward rotation time and extending the reversing time, so that the wet clothes wrapped inside can be shaken out; some manufacturers extend the drying time, and through long-term drying, both the inner and outer clothes are dried.

[0006] The solutions mentioned in the above schemes all have certain drawbacks. At present, most heat pump dryers on the market are fixed-frequency motors. The fan and the inner drum are connected to the motor shaft at the same time. When the motor is running, the fan and the inner drum will run synchronously. The fan blades are generally designed to twist to one side in order to obtain sufficient air volume. When the fan reverses, the air volume of the inner drum is greatly reduced. Therefore, for the scheme 1 mentioned in the background technology, when the reversal time is prolonged, the air volume in the drum is reduced, the heat exchange efficiency at the condenser and the evaporator is reduced accordingly, and the drying efficiency is also reduced synchronously, which ultimately leads to time-consuming and power-consuming drying, and the user experience is greatly reduced. For scheme 2, extending the drying time can certainly improve the final drying effect, but in today's world of energy saving and high efficiency, it is obviously not in line with the current development direction of green home appliances. In addition, long-term drying will inevitably cause damage to the clothes that have already been dried, which is time-consuming and power-consuming while damaging the clothes. This is obviously not worth the loss. Summary of the invention

[0007] The purpose of the present invention is to provide a control method for improving the drying uniformity of a heat pump dryer, so as to solve the technical problem that long-term drying may damage clothes that have already been dried, which is time-consuming and power-consuming while damaging clothes.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A control method for improving the drying uniformity of a heat pump dryer, the control method specifically comprising: dividing the drying of the dryer into three stages, namely, stage one, stage two and stage three; firstly, setting the switching data of the dryer in different drying stages, namely, operating time T, switching time A and switching humidity H; in stage one, the inner drum of the dryer operates according to a rotation and stop beat a; when the operating time T>A, the second stage is entered, in which the inner drum of the dryer operates according to a rotation and stop beat b; when the operating time T>A and the humidity value RH1≤H of the clothes is detected, the third stage is entered, in which the inner drum of the dryer operates according to a rotation and stop beat c.

[0010] As a further solution of the present invention: the specific working method of the first stage is: after the heat pump dryer is started, the inner drum first starts to operate at the rotation and stop beat a, and the program starts to record the operating time T. Within the range of the operating time T≤A, the inner drum operates according to the rotation and stop beat a.

[0011] As a further solution of the present invention: the specific working method of the second stage is: when the system detects that the running time T>A, the inner drum rotation and stop beat is adjusted at this time, and the inner drum runs according to the rotation and stop beat b.

[0012] As a further solution of the present invention: the specific working method of the three stages is: after the heat pump dryer is started, the humidity sensor starts to collect the humidity value synchronously, recorded as RH1, and after the program running time T>A, the humidity value judgment starts. When the humidity value RH1≤H is detected, the inner drum adjusts the rotation and stop beat, and continues to run according to the rotation and stop beat c until the end of the program.

[0013] As a further solution of the present invention: the rotation and stop beat a is specifically that the inner drum switches forward and reverse at a high frequency, and the running time of the forward and reverse rotations is equal.

[0014] As a further solution of the present invention: the rotation-stop rhythm b is specifically that the inner drum and the fan rotate forward for a long time and reverse for a short time.

[0015] As a further solution of the present invention: the rotation and stop rhythm c is specifically a rapid forward and reverse rotation of the inner drum to shake out the clothes in the ironing state.

[0016] As a further solution of the present invention, the inner drum rotation and stop beats a, b, c are expressed in the form of X min on / Y s off, the difference being that the values ​​of X and Y are different, wherein X represents the time for which the inner drum rotates continuously, in minutes; and Y represents the time for which the inner drum stops rotating, in seconds.

[0017] As a further solution of the present invention: the setting range of the switching time A is 10-20 minutes.

[0018] As a further solution of the present invention: the fan and the inner cylinder are connected to the motor shaft at the same time.

[0019] Beneficial effects of the present invention:

[0020] (1) By detecting the sampling value of the humidity sensor during the drying process of the heat pump dryer, the rhythm of the inner drum rotation and stop is adjusted, thereby adjusting the distribution of clothes in the dryer, and ultimately improving the drying uniformity of the clothes.

[0021] (2) In the first stage, the inner drum starts to run at a faster rotation and stop rhythm a, realizing frequent forward and reverse rotation of the inner drum. Through this rapid rotation, the wet clothes in the drum are quickly shaken out. The purpose of rapid shaking in this stage is to evenly distribute the clothes in the drum, which is more conducive to the judgment of the humidity sensor at the beginning of drying. By frequently detecting clothes of different materials and different humidity levels, the initial humidity value of the clothes can be more accurately determined, so as to better select the subsequent operation mode of the drying program.

[0022] (3) In the second stage, the machine operates at the start-stop rhythm b. This stage is a normal dehumidification process. The reversal of the inner drum and the fan should be minimized to ensure the stable circulating air volume in the drum, thereby improving the drying efficiency of the inner drum.

[0023] (4) In the three stages, the humidity value RH1 is compared. When the humidity value RH1≤H on the surface of the clothes is detected, the inner drum is adjusted to operate at a faster rotation and stop beat c, where H is the humidity value of the clothes close to the ironing state. At this stage, there is no obvious moisture on the surface of the clothes, but they are still damp. They can be quickly dried by ventilation and drying. However, the clothes at this stage are very easy to wrap or clumped together. Therefore, the inner drum rotation and stop are adjusted to c, and the clothes are shaken apart by rapid forward and reverse rotation to prevent the clothes from clumping and entanglement. In addition, since the clothes at this stage are already in the ironing state, the frequent reversal of the fan has a smaller impact on the drying efficiency, and the wrapping, entanglement and clumping between the clothes have a greater impact on the drying efficiency. Finally, the clothes in the ironing state are shaken apart by the rapid forward and reverse rotation of the inner drum, which improves the drying uniformity of the clothes and also improves the drying efficiency of the heat pump dryer to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 The present invention is a flow chart of a control method for improving drying uniformity of a heat pump clothes dryer. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention / invention to clearly and completely describe the technical solutions in the embodiments of the present invention / invention. Obviously, the described embodiments are only part of the embodiments of the present invention / invention, not all of them. Based on the embodiments of the present invention / invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention / invention.

[0027] In the description of the present invention / invention, it should be understood that the terms "upper", "lower", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] See also Figure 1 As shown, the present invention is a control method for improving the drying uniformity of a heat pump dryer. The control method is specifically as follows: the drying of the dryer is divided into three stages, namely, stage one, stage two and stage three. First, the switching data of the dryer in different drying stages are set, namely, the operating time T, the switching time A and the switching humidity H. In stage one, the inner drum of the dryer operates according to the rotation and stop beat a; when the operating time T>A, the second stage is entered, and in the second stage, the inner drum of the dryer operates according to the rotation and stop beat b; when the operating time T>A and the humidity value RH1≤H of the clothes is detected, the third stage is entered, and in the third stage, the inner drum of the dryer operates according to the rotation and stop beat c.

[0030] After the heat pump dryer is started, the inner drum starts to run at a faster rotation and stop beat a, realizing frequent forward and reverse rotation of the inner drum. Through this rapid rotation, the wet clothes in the drum are quickly shaken out. The purpose of the rapid shaking in this stage is to evenly distribute the clothes in the drum, which is more conducive to the judgment of the humidity sensor at the beginning of the drying process. By frequently detecting clothes of different materials and different humidity, the initial humidity value of the clothes can be more accurately determined, so as to better select the subsequent operation mode of the drying program. At the same time, the program starts to record the running time T. The time for the rapid forward and reverse rotation of the inner drum should not be too long. In the early stage of the drying program, the dehumidification efficiency will steadily increase with time. If the time for the rapid forward and reverse rotation of the inner drum is too long, it will cause the fan to reverse frequently, reduce the air volume in the drum, and reduce the drying efficiency. The time should be set within the range of T≤A, and the specific value of A is determined according to the experimental results. When the program running time T>A, the inner drum is adjusted to stop and run at the rotation and stop beat b. This stage is a conventional dehumidification process. The reversal of the inner drum and the fan should be minimized to ensure the stability of the circulating air volume in the drum.

[0031] After the drying program is started, the humidity sensor starts to detect the humidity value RH1 of the clothes in the drum synchronously. After the program running time T>A, the humidity value RH1 is compared. When the humidity value RH1≤H on the surface of the clothes is detected, the inner drum adjusts the operation mode and starts to operate at a faster rotation and stop beat c, where H is the humidity value of the clothes close to the ironing state. At this stage, there is no obvious moisture on the surface of the clothes, but it still has moisture. It can be quickly dried by ventilation and drying. However, the clothes at this stage are very easy to wrap or clumping together. Therefore, the inner drum rotation and stop are adjusted to c, and the clothes are shaken apart by fast forward and reverse rotation to prevent the clothes from clumping and entanglement. In addition, since the clothes at this stage are already in the ironing state, the frequent reversal of the fan has become less affected by the drying efficiency, and the wrapping, entanglement and clumping between the clothes have a greater impact on the drying efficiency. Finally, the clothes in the ironing state are shaken apart by fast forward and reverse rotation of the inner drum, which improves the drying uniformity of the clothes and also improves the drying efficiency of the heat pump dryer to a certain extent.

[0032] The inner drum rotation and stop beats a, b, and c are expressed in the form of X min on / Y s off. The difference lies in the different values ​​of X and Y, which are set according to the developer's experimental results and actual needs.

[0033] Specifically, X min on: indicates the time the inner drum rotates continuously, in minutes (min). During this time period, the inner drum will continue to work to remove moisture from the clothes and accelerate the drying process through hot air.

[0034] Y s off: indicates the time when the inner drum stops rotating, in seconds (s). During this time period, the inner drum will stop working so that the clothes can be heated more evenly in the hot air, which also helps to reduce the wear and entanglement of clothes.

[0035] When using a clothes dryer, users can choose the appropriate beat mode according to the material, quantity and drying requirements of the clothes. For example, for heavy or difficult-to-dry clothes, you can choose a beat mode with a longer working time and a shorter rest time; while for light or easy-to-dry clothes, you can choose a beat mode with a shorter working time and a longer rest time.

[0036] By adjusting the beat mode, users can also control the energy consumption and noise level during the drying process to a certain extent. For example, choosing a beat mode with a shorter working time can reduce energy consumption and noise level, but may require longer drying time; while choosing a beat mode with a longer working time can speed up the drying process, but may increase energy consumption and noise level.

[0037] The working principle of the present invention is as follows: After the heat pump dryer is started, the program starts timing internally, which is recorded as T as the program running time. Within the range of running time T≤A, the inner drum operates according to the rotation and stop beat a. In this stage, the inner drum rotates forward and reverse quickly to shake out the clothes in the drum and evenly distribute them in the drum, and as many clothes as possible are allowed to contact the humidity sensor to improve the accuracy of the humidity sensor detection value, so as to select the best drying operation program later. When it is detected that the running time T>A, the inner drum rotation and stop beat is adjusted to operate according to the conventional inner drum rotation and stop beat b, that is, the inner drum and the fan rotate forward for a long time and reverse for a short time. The specific rotation and stop beat is determined by the developer according to the needs of the developer. This stage is a conventional drying and dehumidification process. After the drying program is started, the humidity sensor starts to collect humidity values ​​synchronously, recorded as RH1. After the program running time T>A, the humidity value judgment begins. When the humidity value RH1≤H is detected, the inner drum adjusts the rotation and stop rhythm and continues to run according to the rotation and stop rhythm c. At this stage, the inner drum performs rapid forward and reverse rotation again to shake out the clothes in the ironing state to prevent the clothes from being wrapped and clumped, and to improve the drying uniformity of the clothes. After that, the inner drum runs at the rotation and stop rhythm c until the end of the program.

[0038] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A control method for improving the drying uniformity of a heat pump dryer, characterized in that: The control method is specifically as follows: the drying of the dryer is divided into three stages, namely, stage one, stage two and stage three. First, the switching data of the dryer in different drying stages are set, namely, the running time T, the switching time A and the switching humidity H. In stage one, the inner drum of the dryer operates according to the rotation and stop beat a; when the running time T>A, the second stage is entered, and in the second stage, the inner drum of the dryer operates according to the rotation and stop beat b; when the running time T>A and the humidity value RH1≤H of the clothes is detected, the third stage is entered, and in the third stage, the inner drum of the dryer operates according to the rotation and stop beat c.

2. A control method for improving drying uniformity of a heat pump dryer according to claim 1, characterized in that: The specific working method of the first stage is: after the heat pump dryer is started, the inner drum first starts to operate at a start-stop beat a, and the program starts to record the running time T. Within the range of running time T≤A, the inner drum operates according to the start-stop beat a.

3. A control method for improving drying uniformity of a heat pump dryer according to claim 1, characterized in that: The specific working method of the second stage is: when the system detects that the running time T>A, the inner drum rotation and stop beat is adjusted at this time, and the inner drum runs according to the rotation and stop beat b.

4. A control method for improving drying uniformity of a heat pump dryer according to claim 1, characterized in that: The specific working method of the three stages is: after the heat pump dryer is started, the humidity sensor starts to collect humidity values ​​synchronously, recorded as RH1. After the program running time T>A, the humidity value judgment begins. When the humidity value RH1≤H is detected, the inner drum adjusts the rotation and stop rhythm and continues to run according to the rotation and stop rhythm c until the end of the program.

5. The control method for improving the drying uniformity of a heat pump dryer according to claim 2, characterized in that: The rotation-stop beat a is specifically that the inner drum switches forward and reverse at a high frequency, and the running time of the forward and reverse rotations is equal.

6. A control method for improving drying uniformity of a heat pump dryer according to claim 3, characterized in that: The rotation-stop rhythm b is specifically that the inner drum and the fan rotate forward for a long time and reverse for a short time.

7. A control method for improving drying uniformity of a heat pump dryer according to claim 4, characterized in that: The rotation and stop beat c is specifically that the inner drum performs rapid forward and reverse rotation to shake out the clothes in the ironing state.

8. The control method for improving the drying uniformity of a heat pump dryer according to claim 1, characterized in that: The inner cylinder rotation and stop beats a, b, c are expressed in the form of X min on / Y s off, the difference being that the values ​​of X and Y are different, wherein X represents the continuous rotation time of the inner cylinder in minutes, and Y represents the stop rotation time of the inner cylinder in seconds.

9. The control method for improving the drying uniformity of a heat pump dryer according to claim 1, characterized in that: The setting range of the switching time A is 10-20 minutes.

10. A control method for improving drying uniformity of a heat pump dryer according to any one of claims 1 to 9, characterized in that: The fan and the inner cylinder are connected to the motor shaft at the same time.

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