Heat pump dryer air valve control method, control device and heat pump dryer

Abstract

This invention relates to the field of drying technology, providing a method, device, and dryer for controlling the air valve of a heat pump dryer. The air valve control method includes: timing the opening duration of the air valve when it is open; determining that the opening duration has reached a first preset duration; storing the current operating position of the air valve; controlling the air valve to reset and close before returning to the stored operating position; resetting the opening duration of the air valve to zero and resetting the timing. This invention corrects the opening error of the air valve within the control cycle through timed zeroing correction, reducing error accumulation, thereby improving the control accuracy of the air valve in the heat pump dryer and ensuring the drying and dehumidification effect.

Description

Technical Field

[0001] This invention relates to the field of drying technology, and in particular to a method for controlling the air valve of a heat pump dryer, a control device, and the heat pump dryer itself. Background Technology

[0002] In related technologies, heat pump dryers generally control airflow by setting air valves to achieve drying and dehumidification control. They typically use stepper motors to drive the air valves to open or close via transmission gears. During use, due to wear of the transmission gears, the transmission accuracy decreases, and the opening error accumulates continuously during the air valve opening control process. This can easily lead to problems such as the air valve not being able to close or open, thus affecting the temperature control of the dryer and resulting in poor drying and dehumidification effects. Summary of the Invention

[0003] This invention provides a method, device, and dryer for controlling the air valve of a heat pump dryer. By periodically resetting the valve to zero, the opening error of the air valve within the control cycle is corrected, reducing error accumulation and thus improving the control accuracy of the air valve of the heat pump dryer, ensuring the drying and dehumidification effect.

[0004] This invention provides a method for controlling the air valve of a heat pump dryer, comprising:

[0005] When the air valve is in the open state, the duration of the air valve's opening is timed;

[0006] Once the opening duration of the air valve reaches a first preset duration, the current operating position of the air valve is stored, and the air valve is controlled to reset and close before returning to the stored operating position. The opening duration of the air valve is then reset to zero and the timer is restarted.

[0007] According to the present invention, a method for controlling the air valve of a heat pump dryer is provided, wherein the opening duration of the air valve is the cumulative duration of the air valve switching operating positions.

[0008] According to the method for controlling the air valve of a heat pump dryer provided by the present invention, the air valve is reset and closed for a second preset time before returning to the stored operating position.

[0009] The method for controlling the air valve of a heat pump dryer according to the present invention further includes the following steps:

[0010] Obtain the actual wet-bulb temperature of the drying chamber;

[0011] The operating position of the air valve is determined based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber, and the operating position of the air valve corresponds to the opening degree of the air valve.

[0012] According to the present invention, a method for controlling the air valve of a heat pump dryer, the step of determining the operating position of the air valve based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature of the drying chamber specifically includes:

[0013] Set the control temperature;

[0014] The operating setting of the air valve is determined by comparing the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber with the control temperature.

[0015] The control temperature is divided into multiple consecutive control temperature segments from low to high, and each of the multiple control temperature segments corresponds to a different operating position of the air valve.

[0016] According to a method for controlling the air valve of a heat pump dryer provided by the present invention, the air valve is in a closed state when the difference between the actual wet-bulb temperature and the target wet-bulb temperature of the drying chamber is less than or equal to the lower limit of the control temperature.

[0017] When the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is greater than the lower limit of the control temperature, the air valve is in the open state.

[0018] According to a method for controlling the air valve of a heat pump dryer provided by the present invention, when the opening duration of the air valve has not reached the first preset duration, it is determined whether the difference between the actual wet-bulb temperature and the target wet-bulb temperature of the drying chamber is less than or equal to the lower limit of the control temperature.

[0019] If so, control the air valve to close;

[0020] If not, based on the comparison between the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber and the control temperature range, the operating position of the air valve is switched, and the opening time of the air valve is continued to be accumulated.

[0021] According to the present invention, a method for controlling the air valve of a heat pump dryer, wherein the opening duration of the air valve does not reach the first preset duration includes the following situations: the opening duration of the air valve has been reset to zero or has not been reset to zero.

[0022] The present invention also provides a valve control device for a heat pump dryer, comprising:

[0023] The timing module is used to time the opening duration of the air valve when it is in the open state.

[0024] The control module is used to determine when the opening duration of the air valve reaches a first preset duration, store the current operating position of the air valve, control the air valve to reset and close before returning to the stored operating position, and reset the opening duration of the air valve to zero and start timing again.

[0025] The present invention also provides a heat pump dryer, comprising: the air valve control device of the heat pump dryer described above, or, when performing air valve control, employing the air valve control method of the heat pump dryer described above.

[0026] The present invention provides a method, device, and dryer for controlling the air valve of a heat pump dryer. By timing the opening duration of the air valve when it is open, and storing the current operating position of the air valve whenever the opening duration reaches a first preset time, the air valve is reset and closed before returning to the stored operating position, thus resuming operation at the original position. Simultaneously, the opening duration of the air valve is reset to zero and the timing is restarted. This cycle repeats, periodically zeroing and correcting the air valve, reducing the cumulative error of the air valve opening, and thus making the temperature and humidity control of the dryer more accurate. Therefore, the present invention corrects the opening error of the air valve within the control cycle through periodic zeroing correction, reducing error accumulation, thereby improving the control accuracy of the air valve of the heat pump dryer and ensuring the drying and dehumidification effect. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is one of the flowcharts illustrating the air valve control method for the heat pump dryer provided by the present invention;

[0029] Figure 2 This is the second flowchart illustrating the air valve control method for the heat pump dryer provided by the present invention;

[0030] Figure 3 This is a schematic diagram of the air valve control device for the heat pump dryer provided by the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0032] Figure label:

[0033] 110: Timing module; 120: Control module;

[0034] 210: Processor; 220: Communication interface; 230: Memory; 240: Communication bus. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0036] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] The following is combined Figures 1-4 The present invention describes a method for controlling the air valve of a heat pump dryer, a control device, and a heat pump dryer.

[0040] According to an embodiment of the first aspect of the present invention, referring to Figure 1 and Figure 2 As shown, the air valve control method for a heat pump dryer provided by the present invention mainly includes:

[0041] S100. When the air valve is in the open state, the opening time of the air valve is timed.

[0042] Because a stepper motor drives the air valve to open or close via transmission gears, wear on the transmission gears during use reduces transmission accuracy. This leads to a continuous accumulation of opening errors during air valve control; the moment an error occurs in the air valve's opening is the moment the air valve begins to open. Therefore, this invention ensures control accuracy by timing the opening duration of the air valve.

[0043] S200: Determine that the opening time of the air valve has reached the first preset time, store the current operating position of the air valve, and control the air valve to reset and close before returning to the stored operating position. Clear the opening time of the air valve to zero and start timing again.

[0044] Specifically, when the opening duration t of the air valve is greater than or equal to C1 (where C1 is the first preset duration), the opening duration t controlled by the air valve is reset to zero. The current operating position of the air valve is recorded, and a closing reset action is performed. Then, based on the recorded position, the air valve is controlled to return to its previous position, and the timing of the air valve opening duration t is restarted. When the opening duration of the air valve reaches the first preset duration again, step S200 is executed. This cycle repeats, allowing for periodic zeroing and correction of the air valve, reducing the cumulative error of the air valve opening, and thus making the temperature and humidity control of the dryer more accurate. The first preset duration can be designed according to actual needs, for example, it can be 5 to 10 minutes.

[0045] The air valve control method for a heat pump dryer provided in this invention involves timing the opening duration of the air valve when it is open. Whenever the opening duration reaches a first preset time, the current operating position of the air valve is stored, and the air valve is controlled to reset and close before returning to the stored operating position, i.e., resuming operation at the original position. Simultaneously, the opening duration of the air valve is reset to zero and the timing is restarted, and this cycle repeats. Therefore, this invention corrects the opening error of the air valve within the control cycle through timed zeroing correction, reducing error accumulation and thus improving the control accuracy of the air valve in the heat pump dryer, ensuring the drying and dehumidification effect.

[0046] According to one embodiment of the present invention, the opening duration of the air valve is the cumulative duration of the air valve switching operating positions, that is, the cumulative duration of the air valve opening degree changing.

[0047] It should be noted that since the opening of the air valve is usually controlled based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber, when the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is within a certain control temperature range, there may be a situation where the air valve does not operate, that is, the opening of the air valve does not change, and no error will occur. However, if the duration of this non-operation is accumulated into the air valve opening duration timer, a timing error will occur, resulting in low control accuracy.

[0048] Therefore, by designing the opening duration of the air valve as the cumulative duration of the air valve opening change, the present invention can eliminate the time when the air valve does not operate, effectively improve the accuracy of timing, thereby further reducing error accumulation and improving the control precision of the air valve opening.

[0049] According to one embodiment of the present invention, after the air valve is reset and closed for a second preset time, it returns to the stored operating position. The second preset time can be designed according to actual needs, for example, it can be 3 to 5 seconds.

[0050] When the opening time of the damper reaches the first preset time, the current operating position of the damper is stored, and the damper is controlled to reset and close for a period of time. This can effectively ensure that the damper returns to the closed state, that is, ensure that the damper returns to zero, which can effectively reduce the accumulation of errors and improve the control accuracy of the damper.

[0051] According to one embodiment of the present invention, the air valve control method for a heat pump dryer further includes the steps of: obtaining the actual wet-bulb temperature of the drying chamber; determining the operating level of the air valve based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature of the drying chamber, wherein the operating level of the air valve corresponds to the opening degree of the air valve. The higher the operating level of the air valve, the larger the opening degree of the air valve.

[0052] Specifically, the difference T1 between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is proportional to the opening degree of the air valve. The starting point for air valve control in the drying chamber is T1≥C2, where C2 is the preset control temperature. At this time, the air valve is fully open, and as the temperature difference T1 continuously decreases, the opening degree of the air valve continuously decreases until the air valve is closed. The air valve going from fully open to closed is one control cycle. Within one control cycle, the air valve opening degree increases as the temperature difference T1 increases and decreases as the temperature difference T1 decreases.

[0053] According to one embodiment of the present invention, the step of determining the operating position of the air valve based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature of the drying chamber specifically includes: setting a control temperature; determining the operating position of the air valve based on the comparison result between the difference between the actual wet-bulb temperature and the target wet-bulb temperature of the drying chamber and the control temperature; wherein the control temperature is divided into multiple consecutive control temperature segments from low to high, and the multiple control temperature segments correspond one-to-one with multiple operating positions of the air valve.

[0054] Specifically, by comparing the difference T1 between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber with different control temperature ranges, the control temperature range in which the temperature difference T1 falls can be determined. This allows the air valve to be controlled to operate at the corresponding setting, i.e., the corresponding opening degree of the air valve. Therefore, by associating the operating setting with the air valve opening degree and the difference T1, and by setting multiple control temperature ranges, this embodiment of the invention can effectively improve the control accuracy of the air valve opening, achieve precise adjustment of the drying chamber temperature, and thus improve the drying effect.

[0055] In a specific example, the opening degree of the air valve is 0° to 90°, the controlled temperature range is -0.2 to 0.5℃, divided into 8 controlled temperature segments, and the air valve control begins at the difference T1 between the actual wet-bulb temperature T2 and the target wet-bulb temperature T in the drying chamber. ≥ At 0.5℃, the air valve is fully opened to 90°. Then, the air valve opening is adjusted according to the difference T1 between the actual wet-bulb temperature T2 and the target wet-bulb temperature T. The air valve can be set with 8 operating positions. The correspondence between the operating positions, the air valve opening, and the controlled temperature range is shown in the table below.

[0056] Operating gear air valve opening Controlled temperature range / ℃ 0 0° T2≤T-0.2 1 13° T-0.2<T2≤T-0.1 2 26° T - 0.1 < T2 ≤ T 3 39° T < T2 ≤ T + 0.1 4 52° T+0.1<T2≤T+0.2 5 65° T+0.2<T2≤T+0.3 6 78° T+0.3<T2≤T+0.4 7 90° T+0.4<T2≤T+0.5

[0057] According to one embodiment of the present invention, when the difference T1 between the actual wet-bulb temperature T2 and the target wet-bulb temperature T in the drying chamber is less than or equal to the lower limit of the control temperature, the air valve is in the closed state, for example, T1 ≤ -0.2℃; when the difference T1 between the actual wet-bulb temperature T2 and the target wet-bulb temperature T in the drying chamber is greater than the lower limit of the control temperature and less than or equal to the upper limit of the control temperature, the air valve is in the open state, for example, -0.2 < T1 ≤ 0.5℃; and when the difference T1 between the actual wet-bulb temperature T2 and the target wet-bulb temperature T in the drying chamber is greater than or equal to the upper limit of the control temperature, the air valve is in the fully open state, for example, T1 ≥ 0.5℃.

[0058] According to one embodiment of the present invention, referring to Figure 2 As shown, when the opening time of the air valve has not reached the first preset time, it is determined whether the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is less than or equal to the lower limit of the control temperature. If so, the air valve is controlled to close; if not, based on the comparison result between the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber and the control temperature range, the operating position of the air valve is switched, and the opening time of the air valve continues to accumulate until the accumulated opening time of the air valve reaches the first preset time again. When the opening time of the air valve reaches the first preset time, the current operating position of the air valve is stored, and the air valve is controlled to reset and close before returning to the stored operating position. The opening time of the air valve is reset to zero and the timer is restarted. This cycle is repeated. By periodically resetting and correcting the air valve, the accumulated error is reduced, thereby making the temperature and humidity control of the dryer more accurate.

[0059] According to one embodiment of the present invention, the situation in which the opening time of the air valve does not reach the first preset time includes the situation in which the opening time of the air valve is either reset to zero or not reset to zero.

[0060] Understandably, when the air valve has been running fully open for a period of time and has not yet been reset, the opening time has not reached the first preset time. At this time, the above-mentioned gear switching steps are executed. Similarly, when the opening time of the air valve has been reset and the next timing cycle has begun, if the opening time of the air valve has not reached the first preset time, the above-mentioned gear switching steps are executed.

[0061] For example, after resetting and restarting the timing of the air valve's opening duration, the process also includes the step of determining whether the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is less than or equal to the lower limit of the control temperature.

[0062] If so, close the control valve;

[0063] If not, the operating setting of the air valve is switched based on the comparison between the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber and the control temperature range.

[0064] The air valve control method of the heat pump dryer of the present invention will be further described below with reference to a specific example. Figure 2 As shown, it roughly includes:

[0065] (1) When the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is greater than or equal to the upper limit of the controlled temperature, for example, T1 ≥ At 0.5℃, the air valve is fully open. The timer for the opening duration t of the air valve is started to determine whether the opening duration of the air valve has reached the first preset duration, which can be, for example, 5 minutes.

[0066] (2) If the opening time of the air valve reaches the first preset time, t≥5 minutes, store the current operating position of the air valve, and control the air valve to reset and close before returning to the stored operating position, that is, return to the original position to continue to open and run. Clear the opening time t of the air valve to zero and start timing again, and determine whether the difference between the actual wet-bulb temperature of the drying room and the target wet-bulb temperature is less than or equal to the lower limit of the control temperature, for example, T1≤-0.2℃, that is, T2≤T-0.2℃;

[0067] If so, close the control valve;

[0068] If not, based on the comparison between the difference T1 between the actual wet-bulb temperature and the target wet-bulb temperature in the drying room and the control temperature range, switch the operating position of the air valve and continue to accumulate the opening time of the air valve until the accumulated opening time of the air valve reaches the first preset time again, and then reset to zero again, and so on.

[0069] (3) If the opening time of the air valve does not reach the first preset time, determine whether the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying room is less than or equal to the lower limit of the control temperature. If yes, control the air valve to close. If no, based on the comparison result of the difference T1 between the actual wet-bulb temperature and the target wet-bulb temperature in the drying room and the control temperature range, switch the operating position of the air valve and continue to accumulate the opening time of the air valve until the accumulated opening time of the air valve reaches the first preset time again. Then execute the above step (2) again. Repeat this cycle to correct the air valve error within the air valve control cycle by timed zeroing correction, reduce error accumulation, and improve the air valve control accuracy of the heat pump dryer.

[0070] The following describes the air valve control device for the heat pump dryer provided by the present invention. The air valve control device for the heat pump dryer described below can be referred to in correspondence with the air valve control method for the heat pump dryer described above.

[0071] According to an embodiment of the second aspect of the present invention, the present invention also provides an air valve control device for a heat pump dryer, referring to... Figure 3 As shown, it mainly includes a timing module 110 and a control module 120. The timing module 110 is used to time the opening duration of the air valve when it is in the open state; the control module 120 is used to determine when the opening duration of the air valve reaches a first preset duration, store the current operating position of the air valve, and control the air valve to reset and close before returning to the stored operating position, clearing the opening duration of the air valve to zero and restarting the timing.

[0072] The air valve control device of the heat pump dryer of the present invention corrects the opening error of the air valve within the control cycle by timed zeroing correction, reduces error accumulation, improves the control accuracy of the air valve of the heat pump dryer, and ensures the drying and dehumidification effect.

[0073] According to an embodiment of the third aspect of the present invention, the present invention also provides a valve control system for a heat pump dryer, comprising: a transmission gear, a motor, a timer, a memory, and a controller. The motor is connected to the valve via the transmission gear and is used to drive the valve to open or close, thereby adjusting the valve opening degree; the timer is used to time the opening duration of the valve; the memory is used to store the operating settings of the valve; the controller is electrically connected to the motor, the timer, and the memory respectively, and is used to control the operation of the valve. For the specific control process, please refer to the valve control method of the heat pump dryer in the above embodiment, which will not be repeated here.

[0074] The air valve control system of the heat pump dryer provided in this embodiment of the invention can realize timed zeroing and reset of the air valve within the control cycle of the air valve, thereby correcting the opening error of the air valve within the control cycle, reducing error accumulation, and improving the control accuracy of the air valve.

[0075] According to an embodiment of the fourth aspect of the present invention, the present invention also provides a heat pump dryer, comprising: the air valve control device of the heat pump dryer of the above embodiment, or, when performing air valve control, the air valve control method of the heat pump dryer of the above embodiment is adopted.

[0076] Since the heat pump dryer of the present invention includes the air valve control method of the above embodiments, it has all the technical effects of the air valve control method, which will not be elaborated here.

[0077] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 210, a communication interface 220, a memory 230, and a communication bus 240. The processor 210, communication interface 220, and memory 230 communicate with each other via the communication bus 240. The processor 210 can call logic instructions stored in the memory 230 to execute a valve control method for the heat pump dryer. This method includes: timing the opening duration of the valve when it is open; determining that the opening duration has reached a first preset duration; storing the current operating position of the valve; controlling the valve to reset and close before returning to the stored operating position; resetting the opening duration of the valve to zero and resetting the timing.

[0078] Furthermore, the logical instructions in the aforementioned memory 230 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0079] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the air valve control method for the heat pump dryer provided by the above methods. The method includes: timing the opening duration of the air valve when it is in the open state; determining that the opening duration of the air valve has reached a first preset duration; storing the current operating position of the air valve; controlling the air valve to reset and close before returning to the stored operating position; resetting the opening duration of the air valve to zero and re-timing.

[0080] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements a method for controlling the air valve of a heat pump dryer provided by the above methods. The method includes: timing the opening duration of the air valve when it is in an open state; determining that the opening duration of the air valve has reached a first preset duration; storing the current operating position of the air valve; controlling the air valve to reset and close before returning to the stored operating position; resetting the opening duration of the air valve to zero and re-timing.

[0081] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0082] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the air valve of a heat pump dryer, characterized in that, include: Based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber, when the difference is greater than or equal to the upper limit of the controlled temperature, the control valve is fully opened, and the following steps are initiated: When the air valve is in the open state, the opening duration of the air valve is timed; wherein, the opening duration of the air valve is the cumulative duration of the air valve opening degree change. Once the opening duration of the air valve reaches a first preset duration, the current operating position of the air valve is stored. After the air valve is controlled to reset and remain closed for a second preset duration, the air valve is then controlled to return to the stored operating position, and the opening duration of the air valve is reset to zero and the timer is restarted.

2. The air valve control method for a heat pump dryer according to claim 1, characterized in that, It also includes the following steps: Obtain the actual wet-bulb temperature of the drying chamber; The operating position of the air valve is determined based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber, and the operating position of the air valve corresponds to the opening degree of the air valve.

3. The air valve control method for a heat pump dryer according to claim 2, characterized in that, The step of determining the operating setting of the air valve based on the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber specifically includes: Set the control temperature; The operating setting of the air valve is determined by comparing the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber with the control temperature. The control temperature is divided into multiple consecutive control temperature segments from low to high, and each of the multiple control temperature segments corresponds to a different operating position of the air valve.

4. The air valve control method for a heat pump dryer according to claim 3, characterized in that, The air valve is closed when the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is less than or equal to the lower limit of the control temperature.

5. The air valve control method for a heat pump dryer according to claim 3, characterized in that, If the opening duration of the air valve does not reach the first preset duration, determine whether the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber is less than or equal to the lower limit of the control temperature. If so, control the air valve to close; If not, based on the comparison between the difference between the actual wet-bulb temperature and the target wet-bulb temperature in the drying chamber and the control temperature range, the operating position of the air valve is switched, and the opening time of the air valve is continued to be accumulated.

6. The air valve control method for a heat pump dryer according to claim 5, characterized in that, The situations in which the opening time of the air valve does not reach the first preset time include: the situation in which the opening time of the air valve has been reset to zero or has not been reset to zero.

7. A valve control device for a heat pump dryer, characterized in that, A method for controlling the air valve of a heat pump dryer according to any one of claims 1 to 6, comprising: The timing module is used to time the opening duration of the air valve when it is in the open state; wherein, the opening duration of the air valve is the cumulative duration of the air valve opening degree change. The control module is used to determine that the opening duration of the air valve reaches a first preset duration, store the current operating position of the air valve, and control the air valve to reset and close for a second preset duration before controlling the air valve to return to the stored operating position, clearing the opening duration of the air valve to zero and resetting the timer.

8. A heat pump dryer, characterized in that, include: The air valve control device for the heat pump dryer as described in claim 7.

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