Heat pump clothes dryer fan control method, computer device, and heat pump clothes dryer

Abstract

The application relates to a heat pump clothes drying machine fan control method, computer equipment and a heat pump clothes drying machine, which comprises the following steps: obtaining the running pressure of one or more positions in the heat pump passage and the running frequency of the fan; if the running pressure is higher than a preset pressure threshold, entering a pressure reduction mode; according to a first preset condition, adjusting the running frequency of the fan to increase the running frequency of the fan; if the running frequency is higher than a preset frequency threshold, issuing a high-pressure early warning signal. The method enters the pressure reduction mode when the running pressure is higher than the preset pressure threshold, adjusts the running frequency of the fan according to the second preset condition to reduce the running frequency of the fan, accelerates the flow speed of air in the heat pump clothes drying machine, realizes heat dissipation of the whole heat pump clothes drying machine, especially heat dissipation of the condenser, and finally realizes pressure reduction and accurately protects the heat pump system.

Description

TECHNICAL FIELD

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

[0002] The existing heat pump clothes drying machine is based on the principle of heat pump system, the compressor compresses and outputs high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant exchanges heat with air in the condenser and then enters the throttling element for throttling, and then flows into the evaporator system, the heat of the air in the evaporator system forms gaseous refrigerant into the compressor to complete the cycle. In the condenser, the air exchanges heat with the refrigerant to increase the temperature, and the high-temperature air enters the drum to dry the clothes.

[0003] In order to recover the waste heat of the high-temperature air discharged from the drum, the existing heat pump clothes drying machine generally passes the waste heat air to the evaporator to absorb the heat in the high-temperature air. However, due to the heat supply delay characteristics of the heat pump system, the unit cannot achieve a high supply air temperature in the early stage of operation, and as the heat pump clothes drying machine operates, the waste heat recovery of the high-temperature air discharged from the drum is continuously performed, which causes the heat pump system to absorb excessive waste heat, thereby continuously increasing the evaporation side pressure (low pressure) of the heat pump system, further causing the refrigerant pressure delivered by the compressor to the condenser to be too high, causing the high and low pressure to be too high at the same time or on either side, resulting in a pressure too high fault. It can be seen that excessive waste heat recovery will continuously increase the pressure of the heat pump system, affecting the normal operation of the heat pump system. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a heat pump clothes drying machine fan control method, computer equipment and heat pump clothes drying machine. On the one hand, when the operating pressure is higher than the preset pressure threshold, the method enters a pressure reduction mode, periodically increases the operating frequency of the fan according to the first preset condition, accelerates the flow speed of the air in the heat pump clothes drying machine, realizes the heat dissipation of the whole heat pump clothes drying machine, especially the heat dissipation of the condenser, and finally realizes the pressure reduction. On the other hand, when the operating pressure is lower than the preset pressure threshold, the method enters a temperature rising mode, periodically reduces the operating frequency of the fan according to the second preset condition, slows down the flow speed of the air in the heat pump clothes drying machine, realizes the temperature rise of the whole heat pump clothes drying machine, especially makes the air entering the heat pump clothes drying machine and the condenser more fully exchange heat, and finally realizes the temperature rise. The heat pump clothes drying machine can reasonably accelerate the temperature rising efficiency of the heat pump clothes drying machine and accurately protect the heat pump system. Further, the first preset condition and the second preset condition limit the adjustment amount and adjustment period of the operating frequency, so that the operating pressure changes steadily, avoids excessive adjustment, and improves the adjustment efficiency.

[0005] A fan control method of a heat pump clothes dryer, the heat pump clothes dryer comprising a heat pump system, a drum, a fan, a first exhaust air duct and a pressure detection unit, the heat pump system comprising a condenser and an evaporator in communication through a pipeline, the condenser being arranged on the pipeline in communication with one end of the drum, the other end of the drum being in communication with an input end of the fan, an output end of the fan being in communication with one end of the first exhaust air duct, the pressure detection unit being arranged on the pipeline of the heat pump system;

[0006] The fan control method of the heat pump clothes dryer comprises the following steps:

[0007] obtaining an operating pressure of the heat pump system and an operating frequency of the fan;

[0008] if the operating pressure is higher than a preset pressure threshold, entering a pressure reduction mode: adjusting the operating frequency of the fan according to a first preset condition to increase the operating frequency of the fan, and if the operating frequency is higher than a preset frequency threshold, issuing a high pressure warning signal.

[0009] The fan control method of the heat pump clothes dryer enters the pressure reduction mode when the operating pressure is higher than the preset pressure threshold, adjusts the operating frequency of the fan according to the first preset condition to accelerate the flow speed of air in the heat pump clothes dryer, realizes heat dissipation of the whole heat pump clothes dryer, especially heat dissipation of the condenser, and finally realizes pressure reduction to accurately protect the heat pump system.

[0010] Further, the method further comprises the following steps: if the operating pressure is lower than the preset pressure threshold, entering a temperature rise mode: adjusting the operating frequency of the fan according to a second preset condition to reduce the operating frequency of the fan.

[0011] Further, the method further comprises the following steps: obtaining an accumulated operating time of the fan; and if the accumulated operating time is greater than a preset accumulated operating time and the operating pressure is lower than the preset pressure threshold, entering the temperature rise mode.

[0012] Further, the method further comprises the following steps: obtaining a cumulative number of times that the operating pressure is higher than the preset pressure threshold; and if the cumulative number of times is equal to a preset cumulative number of times and the operating pressure is lower than the preset pressure threshold, entering the temperature rise mode.

[0013] Further, the first preset condition is that the operating frequency of the fan is increased by a first preset frequency every first preset time.

[0014] Further, the second preset condition is that the operating frequency of the fan is reduced by a second preset frequency every second operating time.

[0015] Further, the highest operating pressure in the heat pump system pressure values in a plurality of positions is obtained.

[0016] Further, the determination method of the preset pressure threshold is: obtaining the maximum pressure that the heat pump can withstand, calculating the preset pressure threshold, and the calculation formula of the preset pressure threshold is: the maximum pressure-buffer pressure.

[0017] The preset frequency threshold should meet: initial operating frequency≤the preset frequency threshold≤maximum operating frequency, the initial operating frequency is the operating frequency when the fan starts to operate, and the maximum operating frequency is the maximum operating frequency that the fan can reach.

[0018] The application also provides a computer device for heat pump clothes dryer fan control, comprising:

[0019] The signal acquisition module is configured to obtain the operating pressure of the heat pump system and the operating frequency of the fan.

[0020] The preset pressure threshold judgment module is configured to determine whether the operating pressure is higher than the preset pressure threshold.

[0021] The fan operating frequency adjustment module is configured to enter the pressure reduction mode when the operating pressure is higher than the preset pressure threshold, and adjust the operating frequency of the fan according to the first preset condition to increase the operating frequency of the fan.

[0022] The preset frequency threshold judgment module is configured to determine whether the operating frequency is greater than the preset frequency threshold.

[0023] The high-pressure early warning signal output module is configured to output a high-pressure early warning signal when the operating frequency is higher than the preset frequency threshold.

[0024] The application also provides a heat pump clothes dryer, comprising: at least one memory and at least one processor; the memory is used to store one or more computer programs, and the computer programs are executed by the processor to implement the steps of the heat pump clothes dryer fan control method described above; when the one or more computer programs are executed by the at least one processor, the at least one processor implements the steps of the method.

[0025] Compared with the prior art, the application has the following advantages:

[0026] 1. When the operating pressure is higher than the preset pressure threshold, enter the pressure reduction mode, periodically increase the operating frequency of the fan, speed up the flow rate of the air in the heat pump clothes dryer, realize the heat dissipation of the whole heat pump clothes dryer, and finally realize the pressure reduction, which can accurately protect the heat pump system.

[0027] 2. By limiting the adjustment amount of increasing the operating frequency of the fan to 3Hz and the adjustment period to 20s, the operating pressure of the heat pump in this process can be steadily lowered, avoiding excessive adjustment and improving adjustment efficiency;

[0028] 3. When the operating pressure is lower than the preset pressure threshold, enter the warming mode, periodically reduce the operating frequency of the fan to slow down the flow speed of the air in the heat pump clothes dryer, realize the warming of the whole heat pump clothes dryer, and finally realize the warming, which can reasonably speed up the warming efficiency of the heat pump clothes dryer;

[0029] 4. By limiting the adjustment amount of reducing the operating frequency of the fan to 3Hz and the adjustment period to 1min, the operating pressure of the heat pump in this process can be steadily increased, avoiding excessive adjustment and improving adjustment efficiency;

[0030] 5. By adding two judgment conditions that whether the cumulative number of times that the operating pressure is higher than the preset pressure threshold is equal to and whether the cumulative operating time of the fan is greater than the first preset time, the operating frequency of the fan is avoided to be reduced in the later period, and the heat pump is avoided to be warmed too early, thereby avoiding the heat pump pressure being too high, which can more effectively protect the heat pump.

[0031] In order to better understand and implement, the present application is described in detail below in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a front structure schematic diagram of a heat pump clothes dryer described in the present application;

[0033] Figure 2 It is a back structure schematic diagram of a heat pump clothes dryer described in the present application;

[0034] Figure 3 It is a brief structure schematic diagram of a heat pump clothes dryer described in the present application;

[0035] Figure 4 It is a structure schematic diagram of a computer device for heat pump clothes dryer fan control described in the present application;

[0036] Among them, the condenser 1, the evaporator 2,

[0037] The air inlet duct 3, the drum 4, the fan 5, the first air outlet duct 6, the second air outlet duct 7, the exhaust air valve 8, the computer device 9 for heat pump clothes dryer fan control, the signal acquisition module 901, the heat pump operating preset pressure threshold judgment module 902, the fan operating frequency adjustment module 903, the preset frequency threshold judgment module 904, and the high pressure warning signal output module 905. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the embodiments of the present application with reference to the accompanying drawings.

[0039] It should be noted that the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments.

[0040] Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the embodiments of the present application.

[0041] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0042] In addition, in the description of the present application, "a plurality of" means two or more, unless otherwise specified. The association relationship of "and / or" describing the associated objects means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.

[0043] It should be understood that the embodiments of the present application are not limited to the precise structures already described and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present application is only limited by the appended claims.

[0044] The present application provides a heat pump clothes dryer fan control method, in order to facilitate understanding, the present application exemplifies and based on one of the heat pump clothes dryer fan control methods suitable for the present application, the method provided by the present application is described based on the heat pump clothes dryer, it should be noted that the heat pump clothes dryer exemplified by the present application for the convenience of understanding is only illustrative, the components having mutual relationship therein can be physically combined or physically separated, for example, the communication of two components can be direct contact communication, or indirect communication through a third component, the fixation of two components can be direct fixation or indirect fixation; those skilled in the art can select part or all of the modules to achieve the purpose of the present disclosure according to actual needs.

[0045] Please refer to Figure 1 , Figure 2 and Figure 3The heat pump clothes dryer provided by the present application comprises a heat pump system (not shown in the figure), the heat pump system comprising a compressor (not shown in the figure), a condenser 1 and an evaporator 2; the heat pump clothes dryer further comprises an air inlet duct 3, a drum 4, a fan 5, a first air outlet duct 6, a second air outlet duct 7, an exhaust air valve 8 and a plurality of pressure detection units (not shown in the figure); the output end of the compressor is communicated with the input end of the condenser 1, the output end of the condenser 1 is communicated with the input end of the evaporator 2, the output end of the evaporator 2 is communicated with the input end of the compressor, and the plurality of pressure detection units are arranged on the pipeline of the heat pump system; one end of the air inlet duct 3 is communicated with the external environment, the other end of the air inlet duct 3 is communicated with one end of the drum 4, the other end of the drum 4 is communicated with the input end of the fan 5, the output end of the fan 5 is communicated with one end of the first air outlet duct 6, the first air outlet duct 6 is provided with an air outlet, one end of the second air outlet duct 7 is fixedly matched with the inner wall of the air outlet, and the other end of the second air outlet duct 7 is fixed with the exhaust air valve 8; the condenser 1 is fixed at one end of the air inlet duct 3, and the evaporator 2 is fixed at the other end of the first air outlet duct 6; the operation process of the heat pump clothes dryer is that the fan 5 sucks the air in the external environment into the heat pump clothes dryer, the external air enters the drum 4 from the input end of the drum 4 along the air inlet duct 3 after passing through the condenser 1, during which the external air exchanges heat with the condenser 1 first because the condenser 1 is arranged in the air inlet duct 3, the temperature of the external air increases to become high-temperature air after heat exchange, the high-temperature air exchanges heat with the drum 4 again after entering the drum 4, the temperature of the high-temperature air decreases to become residual-temperature air after heat exchange, the exhaust air valve 8 is in a closed state in the initial state, the residual-temperature air is discharged to the outside of the heat pump clothes dryer along the first air outlet duct 6 after passing through the fan 5, during which the residual-temperature air exchanges heat with the evaporator 2 before being discharged from the other end of the first air outlet duct 6 because the evaporator 2 is arranged at the other end of the first air outlet duct 6, the temperature of the residual-temperature air further decreases after heat exchange and is discharged to the outside of the heat pump clothes dryer; during the normal operation of the heat pump clothes dryer, if the exhaust air valve 8 is opened, part of the residual-temperature air discharged from the drum 4 will be discharged to the outside of the heat pump clothes dryer along the second air outlet duct 7. The heat pump clothes dryer fan control method of the present application will be described below based on the heat pump clothes dryer.

[0046] In one embodiment, the heat pump clothes dryer comprises only one pressure detection unit, and the heat pump clothes dryer fan control method comprises the following steps:

[0047] obtaining the operating pressure detected by the pressure detection unit and the operating frequency of the fan 5;

[0048] if the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, entering a pressure reduction mode: adjusting the operating frequency of the fan 5 according to the first preset condition to increase the operating frequency of the fan 5, and if the operating frequency is higher than the preset frequency threshold, issuing a high-pressure warning signal.

[0049] Specifically, when the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the heat pump clothes dryer enters the pressure reduction mode: the operating frequency of the fan 5 is increased to speed up the flow rate of the air in the heat pump clothes dryer, thereby achieving heat dissipation of the entire heat pump clothes dryer, especially the condenser 1. After a period of time, if the operating pressure detected by the pressure detection unit is still higher than the preset pressure threshold, the heat pump clothes dryer remains in the pressure reduction mode, and the operating frequency of the fan 5 continues to be increased until the operating pressure is lower than the preset pressure threshold, or until the operating frequency is higher than the preset frequency threshold. When the operating pressure is lower than the preset pressure threshold, the operating frequency of the fan remains unchanged. When the operating frequency is higher than the preset frequency threshold, a high-temperature warning signal is issued, and the heat pump clothes dryer is cooled by other means, for example, the heat pump clothes dryer of the present application can open the exhaust air valve 8 to further cool the heat pump clothes dryer by directly exhausting part of the residual warm air to the outside.

[0050] The preset frequency threshold should satisfy: initial operating frequency ≤ preset frequency threshold ≤ maximum operating frequency. The initial operating frequency is the initial operating frequency of the fan, and the maximum operating frequency is the maximum frequency that the fan can reach. The preset frequency threshold only needs to be set within this range according to the performance needs of the product.

[0051] The preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand - the buffer pressure (3.5 bar in this embodiment). The preset pressure threshold is related to the type of refrigerant and the compressor used, and will change according to changes in the refrigerant and the compressor. In a specific embodiment, when the refrigerant is r410a, the maximum pressure that the corresponding compressor can withstand is about 42 bar, so the preset pressure threshold is 38.5 bar.

[0052] In the pressure reduction mode, the operating pressure detected by the pressure detection unit will decrease as the operating frequency of the fan 5 increases. During this process, if the operating frequency of the fan 5 changes too much, the fluctuation of the operating pressure will also increase, leading to the complication of the adjustment process. If the period of change of the operating frequency of the fan 5 is too short, the operating frequency of the fan will be increased again before the operating pressure stabilizes, leading to excessive adjustment of the operating frequency.

[0053] Therefore, it is necessary to limit the adjustment amount of the operating frequency of the fan 5 and determine the period of change of the operating frequency of the fan 5 to simplify the adjustment process as much as possible.

[0054] In a preferred embodiment, the heat pump clothes dryer only includes one pressure detection unit, and the heat pump clothes dryer fan control method includes the following steps:

[0055] acquire the operating pressure detected by the pressure detection unit and the operating frequency of the fan 5;

[0056] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the pressure reduction mode is entered: according to the first preset condition, the operating frequency of the fan 5 is adjusted to increase the operating frequency of the fan 5, and if the operating frequency is higher than the preset frequency threshold, a high-pressure warning signal is issued. The first preset condition is that every first preset time, the operating frequency of the fan is increased by a first preset frequency.

[0057] Specifically, the first preset time is 20s, and the first preset frequency is 3Hz. The first preset time and the first preset frequency can be adjusted according to the specific situation of the heat pump clothes dryer. The adjustment of the first preset time should be based on the guarantee that the adjusted operating pressure tends to be stable, and the adjustment of the first preset frequency should be based on the guarantee that the adjusted operating pressure has small fluctuations and is easy to control. That is, when the operating pressure detected by the pressure detection unit of the fan is higher than the preset pressure threshold, the heat pump clothes dryer enters the pressure reduction mode: the operating frequency of the fan 5 is increased by the first preset frequency (3Hz in this embodiment), and after a first preset time (20s in this embodiment), if the operating pressure detected by the pressure detection unit is still higher than the preset pressure threshold, the heat pump clothes dryer remains in the pressure reduction mode and continues to increase the operating frequency of the fan 5 by 3Hz until the operating pressure is lower than the preset pressure threshold, or until the operating frequency is higher than the preset frequency threshold. Wherein, when the operating pressure is lower than the preset pressure threshold, the operating frequency of the fan remains unchanged, and when the operating frequency is higher than the preset frequency threshold, a high-temperature warning signal is issued, and other methods are used to cool the heat pump clothes dryer, for example, the heat pump clothes dryer in this embodiment can further cool the heat pump clothes dryer by opening the exhaust air valve to directly exhaust part of the residual warm air to the outside.

[0058] Wherein, the preset frequency threshold should satisfy: initial operating frequency ≤ preset frequency threshold ≤ maximum operating frequency, the initial operating frequency is the initial operating frequency of the fan, and the maximum operating frequency is the maximum frequency that the fan can reach. The preset frequency threshold only needs to be set within this range according to the performance needs of the product.

[0059] Wherein, the preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand - the buffer pressure (3.5bar in this embodiment). The preset pressure threshold is related to the type of refrigerant and the compressor used, and the preset pressure threshold will change according to the changes of the refrigerant and the compressor. In a specific embodiment, when the refrigerant is r410a, the maximum pressure that the corresponding type of compressor can withstand is about 42bar, so the preset pressure threshold is 38.5bar.

[0060] To further ensure that the pressure at each part of the heat pump system is not higher than the preset pressure threshold, multiple pressure detection units can be arranged at multiple parts of the heat pump system.

[0061] In an optional embodiment, the heat pump clothes dryer comprises two pressure detection units arranged between the output end of the compressor and the input end of the condenser 1 and between the output end of the evaporator 2 and the input end of the compressor respectively. The heat pump clothes dryer fan control method further comprises the following steps:

[0062] Obtaining two operating pressures detected by the two pressure detection units and the operating frequency of the fan 5;

[0063] As long as any one of the two operating pressures is higher than the preset pressure threshold, the heat pump clothes dryer enters the pressure reduction mode: according to the first preset condition, the operating frequency of the fan 5 is adjusted to increase the operating frequency of the fan 5, and if the operating frequency is higher than the preset frequency threshold, a high-pressure warning signal is issued.

[0064] Specifically, when the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the heat pump clothes dryer enters the pressure reduction mode: the operating frequency of the fan 5 is increased to speed up the flow speed of the air in the heat pump clothes dryer, thereby achieving heat dissipation of the entire heat pump clothes dryer, especially the condenser 1. After a period of time, if the operating pressure detected by the pressure detection unit is still higher than the preset pressure threshold, the heat pump clothes dryer remains in the pressure reduction mode and continues to increase the operating frequency of the fan 5 until the operating pressure is lower than the preset pressure threshold, or until the operating frequency is higher than the preset frequency threshold. Wherein, when the operating pressure is lower than the preset pressure threshold, the operating frequency of the fan remains unchanged, and when the operating frequency is higher than the preset frequency threshold, a high-temperature warning signal is issued, and other methods are used to cool the heat pump clothes dryer, for example, the heat pump clothes dryer of the present application can open the exhaust air valve 8 to further cool the heat pump clothes dryer by directly exhausting part of the residual warm air to the outside.

[0065] Wherein, the preset frequency threshold should satisfy: initial operating frequency ≤ preset frequency threshold ≤ maximum operating frequency, the initial operating frequency is the initial operating frequency of the fan, and the maximum operating frequency is the maximum frequency that the fan can reach. The preset frequency threshold only needs to be set within this range according to the performance needs of the product.

[0066] Wherein, the preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand - the buffer pressure (3.5 bar in this embodiment). The preset pressure threshold is related to the type of refrigerant and the compressor used, and the preset pressure threshold will change according to the changes of the refrigerant and the compressor. In a specific embodiment, when the refrigerant is r410a, the maximum pressure that the corresponding type of compressor can withstand is about 42 bar, so the preset pressure threshold is 38.5 bar.

[0067] Due to the heat supply delay characteristics of the heat pump system, a higher supply air temperature cannot be achieved in the early stage of operation, so the operating frequency of the fan can be reduced in the early stage of operation.

[0068] In a preferred embodiment, the heat pump clothes dryer only includes one pressure detection unit, and the heat pump clothes dryer fan control method includes the following steps:

[0069] Obtain the operating pressure detected by the pressure detection unit and the operating frequency of the fan 5;

[0070] If the operating pressure detected by the pressure detection unit is lower than the preset pressure threshold, enter the temperature rising mode: according to the second preset condition, adjust the operating frequency of the fan 5 to reduce the operating frequency of the fan 5;

[0071] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, enter the pressure reducing mode: according to the first preset condition, adjust the operating frequency of the fan 5 to increase the operating frequency of the fan 5, and if the operating frequency is higher than the preset frequency threshold, issue a high pressure warning signal.

[0072] Specifically, when the operating pressure detected by the pressure detection unit is lower than the preset pressure threshold, the heat pump clothes dryer enters the temperature rising mode: the operating frequency of the fan 5 is reduced, and after a period of time, if the operating pressure detected by the pressure detection unit is still lower than the preset pressure threshold, the heat pump clothes dryer remains in the temperature rising mode and continues to reduce the operating frequency of the fan 5 until the operating pressure is higher than the preset pressure threshold; when the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the heat pump clothes dryer enters the pressure reducing mode: the operating frequency of the fan 5 is increased to speed up the flow speed of air in the heat pump clothes dryer, thereby achieving heat dissipation of the entire heat pump clothes dryer, especially the condenser 1; after a period of time, if the operating pressure detected by the pressure detection unit is still higher than the preset pressure threshold, the heat pump clothes dryer remains in the pressure reducing mode and continues to increase the operating frequency of the fan 5 until the operating pressure is lower than the preset pressure threshold, or until the operating frequency is higher than the preset frequency threshold; wherein the operating frequency of the fan remains unchanged when the operating pressure is lower than the preset pressure threshold, a high temperature warning signal is issued when the operating frequency is higher than the preset frequency threshold, and other methods are used to cool the heat pump clothes dryer, for example, the heat pump clothes dryer of the present application can open the exhaust air valve 8 to further cool the heat pump clothes dryer by directly exhausting part of the residual warm air to the outside.

[0073] Wherein, the preset frequency threshold should satisfy: initial operating frequency ≤ preset frequency threshold ≤ maximum operating frequency, the initial operating frequency is the initial operating frequency of the fan, the maximum operating frequency is the maximum frequency that the fan can reach, and the preset frequency threshold only needs to be set within this range according to the performance needs of the product.

[0074] The preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand, i.e. the buffer pressure (3.5 bar in this embodiment), and the type of refrigerant and the compressor used are related. The preset pressure threshold will change according to the changes of the refrigerant and the compressor. In a specific embodiment, when the refrigerant is r410a, the maximum pressure that the corresponding compressor can withstand is about 42 bar, so the preset pressure threshold is 38.5 bar.

[0075] Due to the heat supply delay characteristics of the heat pump system, if the operating frequency of the fan 5 is reduced too early, the pressure of the heat pump system may rise too quickly, so the timing of entering the temperature rising mode of the heat pump clothes dryer needs to be controlled and limited.

[0076] In a preferred embodiment, the heat pump clothes dryer only includes one pressure detection unit, and the heat pump clothes dryer fan control method includes the following steps:

[0077] Obtaining the operating pressure detected by the pressure detection unit, the operating frequency of the fan 5 and the cumulative operating time of the fan 5;

[0078] If the cumulative operating time is greater than the preset cumulative operating time, and the operating pressure is lower than the preset pressure threshold, the operating pressure detected by the pressure detection unit is lower than the preset pressure threshold, and the temperature rising mode is entered: according to the second preset condition, the operating frequency of the fan 5 is adjusted to reduce the operating frequency of the fan 5;

[0079] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the pressure reduction mode is entered: according to the first preset condition, the operating frequency of the fan 5 is adjusted to increase the operating frequency of the fan 5, and if the operating frequency is higher than the preset frequency threshold, a high pressure warning signal is issued.

[0080] Specifically, when the operation pressure detected by the pressure detection unit is lower than the preset pressure threshold, if the cumulative running time is less than the first preset time, the fan continues to operate at the initial operating frequency, and if the cumulative running time is greater than the first preset time, the heat pump clothes dryer enters the temperature rising mode: the operating frequency of the fan 5 is reduced, and after a period of time, if the operation pressure detected by the pressure detection unit is still lower than the preset pressure threshold, the heat pump clothes dryer remains in the temperature rising mode and continues to reduce the operating frequency of the fan 5 until the operation pressure is higher than the preset pressure threshold; when the operation pressure detected by the pressure detection unit is higher than the preset pressure threshold, the heat pump clothes dryer enters the pressure reducing mode: the operating frequency of the fan 5 is increased to speed up the flow speed of the air in the heat pump clothes dryer, thereby achieving heat dissipation of the heat pump clothes dryer as a whole, especially the condenser 1, and after a period of time, if the operation pressure detected by the pressure detection unit is still higher than the preset pressure threshold, the heat pump clothes dryer remains in the pressure reducing mode and continues to increase the operating frequency of the fan 5 until the operation pressure is lower than the preset pressure threshold or until the operating frequency is higher than the preset frequency threshold; wherein the operating frequency of the fan remains unchanged when the operating pressure is lower than the preset pressure threshold, and a high temperature warning signal is issued when the operating frequency is higher than the preset frequency threshold, and other methods are used to cool the heat pump clothes dryer, for example, the heat pump clothes dryer of the present application can open the exhaust air valve 8 to further cool the heat pump clothes dryer by directly exhausting part of the residual warm air to the outside.

[0081] The preset cumulative running time can be 5 minutes, and the preset cumulative running time can be adjusted according to the specific situation of the heat pump clothes dryer, and the preheating time required for the corresponding heat pump clothes dryer under normal circumstances should be exceeded; the preset frequency threshold should satisfy: initial operating frequency ≤ preset frequency threshold ≤ maximum operating frequency, the initial operating frequency is the initial operating frequency of the fan, and the maximum operating frequency is the maximum frequency that the fan can reach, and the preset frequency threshold only needs to be set in this range according to the performance needs of the product.

[0082] The preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand - the buffer pressure (3.5 bar in this embodiment), and the preset pressure threshold is related to the type of refrigerant and the compressor used, and the preset pressure threshold will change according to the changes of the refrigerant and the compressor. In a specific embodiment, when the refrigerant is r410a, the maximum pressure that the corresponding compressor can withstand is about 42 bar, so the preset pressure threshold is 38.5 bar.

[0083] Because in the later stage of the operation of the heat pump clothes dryer, the heat recovered by the evaporator will continue to increase, reducing the operating frequency of the fan will cause large fluctuations in the pressure of the heat pump system, therefore, the operating frequency of the fan is not reduced in the later stage of the operation of the heat pump clothes dryer.

[0084] In a preferred embodiment, the heat pump clothes dryer only comprises one pressure detection unit, and the heat pump clothes dryer fan control method comprises the following steps:

[0085] obtaining the running pressure detected by the pressure detection unit, the running frequency of the fan 5 and the cumulative number of times when the running pressure is higher than the preset pressure threshold value;

[0086] If the running pressure detected by the pressure detection unit is lower than the preset pressure threshold value, and the cumulative number of times is equal to the preset cumulative number of times, the heat pump clothes dryer enters the temperature rising mode: according to the second preset condition, the running frequency of the fan 5 is adjusted to reduce the running frequency of the fan 5.

[0087] If the running pressure detected by the pressure detection unit is higher than the preset pressure threshold value, the heat pump clothes dryer enters the pressure reducing mode: according to the first preset condition, the running frequency of the fan 5 is adjusted to increase the running frequency of the fan 5, and if the running frequency is higher than the preset frequency threshold value, a high pressure warning signal is sent.

[0088] Specifically, the preset cumulative number of times is 0, and the preset cumulative number of times is generally once for a normal heat pump clothes dryer. When the heat pump clothes dryer is aging and causes errors such as entering the temperature rising mode and exiting the temperature rising mode, the preset cumulative number of times can be increased. When the running pressure detected by the pressure detection unit is lower than the preset pressure threshold value, if the cumulative number of times is not equal to the preset cumulative number of times, the heat pump clothes dryer will not enter the temperature rising mode, and if the cumulative number of times is equal to the preset cumulative number of times, the heat pump clothes dryer will enter the temperature rising mode: the running frequency of the fan 5 is reduced, and after a period of time, if the running pressure detected by the pressure detection unit is still lower than the preset pressure threshold value, the heat pump clothes dryer remains in the temperature rising mode and continues to reduce the running frequency of the fan 5 until the running pressure is higher than the preset pressure threshold value. When the running pressure detected by the pressure detection unit is higher than the preset pressure threshold value, the heat pump clothes dryer enters the pressure reducing mode: the running frequency of the fan 5 is increased to speed up the flow speed of air in the heat pump clothes dryer, thereby achieving heat dissipation of the heat pump clothes dryer as a whole, especially heat dissipation of the condenser 1. After a period of time, if the running pressure detected by the pressure detection unit is still higher than the preset pressure threshold value, the heat pump clothes dryer remains in the pressure reducing mode and continues to increase the running frequency of the fan 5 until the running pressure is lower than the preset pressure threshold value or the running frequency is higher than the preset frequency threshold value. When the running pressure is lower than the preset pressure threshold value, the running frequency of the fan remains unchanged, and when the running frequency is higher than the preset frequency threshold value, a high temperature warning signal is sent, and other methods are used to cool the heat pump clothes dryer, for example, the heat pump clothes dryer of the present application can open the exhaust air valve 8 to further cool the heat pump clothes dryer by directly exhausting part of the residual air to the outside.

[0089] The preset frequency threshold should satisfy: initial operation frequency ≤ preset frequency threshold ≤ maximum operation frequency, the initial operation frequency is the initial operation frequency of the fan, the maximum operation frequency is the maximum frequency that the fan can reach, and the preset frequency threshold only needs to be set in the range according to the performance needs of the product.

[0090] The preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand, i.e., the buffer pressure (3.5 bar in this embodiment), and the preset pressure threshold is related to the type of refrigerant and the compressor used. The preset pressure threshold will change according to changes in the refrigerant and the compressor. In a specific embodiment, when the refrigerant is r410a, the maximum pressure that the corresponding compressor can withstand is about 42 bar, so the preset pressure threshold is 38.5 bar.

[0091] In the temperature increasing mode, the operating pressure detected by the pressure detection unit will increase as the operating frequency of the fan 5 decreases. During this process, if the operating frequency of the fan 5 changes too much, the fluctuation of the operating pressure will also increase, leading to the complication of the adjustment process. If the period of the change of the operating frequency of the fan 5 is too short, the operating pressure will not be stable before the operating frequency of the fan is reduced again, leading to excessive adjustment of the operating frequency. Therefore, it is necessary to limit the adjustment amount of the operating frequency of the fan 5 and the period of the change of the operating frequency of the fan 5 to simplify the adjustment process as much as possible.

[0092] In a preferred embodiment, the heat pump clothes dryer only includes one pressure detection unit, and the heat pump clothes dryer fan control method includes the following steps:

[0093] Obtaining the operating pressure detected by the pressure detection unit and the operating frequency of the fan 5;

[0094] If the operating pressure detected by the pressure detection unit is lower than the preset pressure threshold, the temperature increasing mode is entered: according to the second preset condition, the operating frequency of the fan 5 is adjusted to reduce the operating frequency of the fan 5; wherein the second preset condition is: every second preset time, the operating frequency of the fan is reduced by a second preset frequency.

[0095] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the pressure reducing mode is entered: according to the first preset condition, the operating frequency of the fan 5 is adjusted to increase the operating frequency of the fan 5, and if the operating frequency is higher than the preset frequency threshold, a high pressure warning signal is issued.

[0096] Specifically, the second preset time and the second preset frequency can be adjusted according to the specific situation of the heat pump clothes dryer, the adjustment of the second preset time should be based on the guarantee that the adjusted operating pressure tends to be stable, and the adjustment of the second preset frequency should be based on the guarantee that the adjusted operating pressure has small fluctuations and is easy to control; that is, when the operating pressure detected by the fan of the pressure detection unit is lower than the preset pressure threshold, the heat pump clothes dryer enters the temperature rising mode: the operating frequency of the fan 5 is increased by the second preset frequency (3 Hz in this embodiment), and after a first preset time (1 min in this embodiment), if the operating pressure detected by the pressure detection unit is still lower than the preset pressure threshold, the heat pump clothes dryer remains in the temperature rising mode and continues to reduce the operating frequency of the fan 5 until the operating pressure is higher than the preset pressure threshold; when the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the heat pump clothes dryer enters the pressure reducing mode: the operating frequency of the fan 5 is increased to speed up the flow speed of the air in the heat pump clothes dryer, thereby achieving heat dissipation of the heat pump clothes dryer as a whole, especially the condenser 1, and after a period of time, if the operating pressure detected by the pressure detection unit is still higher than the preset pressure threshold, the heat pump clothes dryer remains in the pressure reducing mode and continues to increase the operating frequency of the fan 5 until the operating pressure is lower than the preset pressure threshold, or until the operating frequency is higher than the preset frequency threshold; wherein the operating frequency of the fan remains unchanged when the operating pressure is lower than the preset pressure threshold, and a high temperature warning signal is issued when the operating frequency is higher than the preset frequency threshold, and other methods are used to cool the heat pump clothes dryer, for example, the heat pump clothes dryer in this embodiment can open the exhaust air valve 8 to further cool the heat pump clothes dryer by directly exhausting part of the residual warm air to the outside.

[0097] wherein the preset frequency threshold should satisfy: initial operating frequency ≤ preset frequency threshold ≤ maximum operating frequency, the initial operating frequency is the initial operating frequency of the fan, and the maximum operating frequency is the maximum frequency that the fan can reach, and the preset frequency threshold only needs to be set within this range according to the performance needs of the product.

[0098] wherein the preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand - the buffer pressure (3.5 bar in this embodiment), the preset pressure threshold is related to the type of refrigerant and the compressor used, and the preset pressure threshold will change according to the changes of the refrigerant and the compressor, in a specific embodiment, when the refrigerant is r410a, the maximum pressure that the corresponding type of compressor can withstand is about 42 bar, so the preset pressure threshold is 38.5 bar.

[0099] In a preferred embodiment, the heat pump clothes dryer only includes one pressure detection unit, and the heat pump clothes dryer fan control method includes the following steps:

[0100] acquire the running pressure detected by the pressure detection unit, the running frequency of the fan 5, the cumulative number of times that the running pressure is higher than a preset pressure threshold, and the cumulative running time of the fan 5;

[0101] If the cumulative number of times is equal to a preset cumulative number of times, the cumulative running time of the fan 5 is greater than a preset cumulative running time, and the running pressure detected by the pressure detection unit is lower than the preset pressure threshold, the temperature increasing mode is entered: according to a second preset condition, the running frequency of the fan is adjusted to reduce the running frequency of the fan, and the second preset condition is that every second running time (20s in this embodiment), the running frequency of the fan is reduced by a second preset frequency (3Hz in this embodiment).

[0102] If the running pressure detected by the pressure detection unit is higher than the preset pressure threshold, the pressure reducing mode is entered: according to a first preset condition, the running frequency of the fan 5 is adjusted to increase the running frequency of the fan 5, and if the running frequency is higher than a preset frequency threshold, a high-pressure early warning signal is sent. The first preset condition is that every first preset time (1min in this embodiment), the running frequency of the fan is increased by a first preset frequency (3Hz in this embodiment), and if the running frequency is higher than the preset frequency threshold, a high-pressure early warning signal is sent.

[0103] The preset frequency threshold should satisfy: initial running frequency≤preset frequency threshold≤maximum running frequency, the initial running frequency is the initial running frequency of the fan, the maximum running frequency is the maximum frequency that the fan can reach, and the preset frequency threshold only needs to be set in this range according to the performance needs of the product.

[0104] The preset pressure threshold is a value obtained after the maximum pressure that the compressor can withstand is reduced by the buffer pressure (3.5bar in this embodiment).

[0105] The embodiment is the optimal embodiment, and the best effect of saving electricity and protecting the fan can be achieved.

[0106] In a second aspect, the present application also provides a computer device 9 for fan control of a heat pump clothes dryer, as shown in the accompanying drawings, the computer device comprises: Figure 4

[0107] The signal acquisition module 901 is configured to acquire the running pressure of the heat pump passage and the running frequency of the fan.

[0108] The heat pump running preset pressure threshold judgment module 902 is configured to judge whether the running pressure is higher than a preset pressure threshold.

[0109] ​The fan operation frequency adjusting module 903 is configured to, when the operation pressure is higher than the preset pressure threshold, enter a pressure reduction mode, and adjust the operation frequency of the fan according to a first preset condition, so as to increase the operation frequency of the fan.

[0110] The preset frequency threshold judging module 904 is configured to judge whether the operation frequency is higher than a preset frequency threshold.

[0111] The high-pressure early warning signal output module 905 is configured to output a high-pressure early warning signal when the operation frequency is higher than the preset frequency threshold.

[0112] In a preferred embodiment, the computer device further comprises:

[0113] The temperature rise judging module is configured to judge whether the operation pressure is lower than a preset pressure threshold.

[0114] The temperature rise mode executing module is configured to, when the operation pressure is lower than the preset pressure threshold, execute a temperature rise mode, and adjust the operation frequency of the fan according to a second preset condition, so as to decrease the operation frequency of the fan.

[0115] In a preferred embodiment, the computer device further comprises:

[0116] The cumulative operation time recording module is configured to record the cumulative operation time of the fan 5.

[0117] The cumulative operation time judging module is configured to judge whether the cumulative operation time of the fan 5 is greater than a first preset time.

[0118] In a preferred embodiment, the computer device further comprises:

[0119] The cumulative number recording module is configured to record the cumulative number of times when the operation pressure is higher than the preset pressure threshold.

[0120] The cumulative number judging module is configured to judge whether the cumulative number of times is equal to a preset cumulative number of times.

[0121] In a preferred embodiment, the computer device further comprises:

[0122] The first preset condition executing module is configured to execute: increasing the operation frequency of the fan by a first preset frequency every first preset time.

[0123] In a preferred embodiment, the computer device further comprises:

[0124] The second preset condition executing module is configured to execute: decreasing the operation frequency of the fan by a second preset frequency every second preset time.

[0125] In a preferred embodiment, the computer device further comprises:

[0126] The highest operating pressure acquisition module is configured to acquire the highest operating pressure from the pressure values of the heat pump system at multiple positions in the heat pump system.

[0127] For the computer device embodiment, since it basically corresponds to the method embodiment, the relevant parts are described in the method embodiment. The above-described computer device embodiment is only illustrative, and the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units. It is clear to those skilled in the art that, for the convenience and brevity of description, the specific working processes of the above-described system, computer device and unit can refer to the corresponding processes in the foregoing method embodiment, and will not be described here.

[0128] In a third aspect, the present application also provides a heat pump clothes dryer, comprising at least one memory and at least one processor;

[0129] The memory is configured to store one or more computer programs, and when the one or more computer programs are executed by the at least one processor, the at least one processor implements the steps of the heat pump clothes dryer fan control method described above.

[0130] Compared with the prior art, the present application has the following beneficial effects:

[0131] 1. When the operating pressure is higher than the preset pressure threshold, enter the pressure reduction mode, accelerate the flow speed of the air in the heat pump clothes dryer by periodically increasing the operating frequency of the fan, realize the heat dissipation of the whole heat pump clothes dryer, and finally realize the pressure reduction, which can accurately protect the heat pump system;

[0132] 2. By limiting the adjustment amount of increasing the operating frequency of the fan to 3Hz and the adjustment period to 20s, the operating pressure of the heat pump in this process can be steadily reduced, excessive adjustment is avoided, and the adjustment efficiency is improved;

[0133] 3. When the operating pressure is lower than the preset pressure threshold, enter the temperature rise mode, slow down the flow speed of the air in the heat pump clothes dryer by periodically reducing the operating frequency of the fan, realize the temperature rise of the whole heat pump clothes dryer, and finally realize the temperature rise, which can reasonably accelerate the temperature rise efficiency of the heat pump clothes dryer;

[0134] 4. By limiting the adjustment amount of reducing the operating frequency of the fan to 3Hz and the adjustment period to 1min, the operating pressure of the heat pump in this process can be steadily increased, excessive adjustment is avoided, and the adjustment efficiency is improved;

[0135] 5. By adding the cumulative number of times when the running pressure is higher than the preset pressure threshold value is equal to and the cumulative running time of the fan is greater than the first preset time, the running frequency of the fan is prevented from being reduced in the later period, the heat pump is prevented from being warmed up too early, and the heat pump pressure is prevented from being too high, so that the heat pump can be more effectively protected.

[0136] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, and the present application also intends to include these modifications and improvements.

Claims

1. A method for controlling a fan of a heat pump clothes dryer, the heat pump clothes dryer comprising a heat pump system, a drum, a fan, a first exhaust air duct, and a pressure detection unit, the heat pump system comprising a condenser and an evaporator connected by a pipeline, the condenser being arranged on the pipeline connected with one end of the drum, the other end of the drum being connected with an input end of the fan, an output end of the fan being connected with one end of the first exhaust air duct, the evaporator being arranged at the other end of the first exhaust air duct, the pressure detection unit being arranged on the pipeline of the heat pump system, the method comprising the following steps: obtaining an operating pressure of the heat pump system and an operating frequency of the fan; if the operating pressure is higher than a preset pressure threshold, entering a pressure reduction mode: adjusting the operating frequency of the fan according to a first preset condition to increase the operating frequency of the fan, and if the operating frequency is higher than a preset frequency threshold, issuing a high pressure warning signal; the first preset condition being that the operating frequency of the fan is increased by a first preset frequency every first preset time. The method further comprises the following steps: if the operating pressure is lower than the preset pressure threshold, entering a temperature increase mode: adjusting the operating frequency of the fan according to a second preset condition to decrease the operating frequency of the fan. The method further comprises the following steps: obtaining a cumulative operating time of the fan; if the cumulative operating time is greater than a preset cumulative operating time and the operating pressure is lower than the preset pressure threshold, entering the temperature increase mode. The method further comprises the following steps: obtaining a cumulative number of times that the operating pressure is higher than the preset pressure threshold; if the cumulative number of times is equal to a preset cumulative number of times and the operating pressure is lower than the preset pressure threshold, entering the temperature increase mode. The second preset condition being that the operating frequency of the fan is decreased by a second preset frequency every second operating time.

2. The method of claim 1, wherein the fan control method is characterized by: 6.The method according to claim 1, wherein the operating pressure is obtained from a highest pressure value among pressure values of the heat pump system at multiple positions. 7.The method according to claim 1, wherein the preset pressure threshold is determined by obtaining a maximum pressure that the heat pump can withstand, and calculating the preset pressure threshold according to a formula: the maximum pressure-buffer pressure; the preset frequency threshold should satisfy: an initial operating frequency≤the preset frequency threshold≤a maximum operating frequency, the initial operating frequency being an operating frequency when the fan starts to operate, and the maximum operating frequency being a maximum operating frequency that the fan can reach.

3. The method of claim 2, wherein the fan control method is characterized by, The method comprises: a signal obtaining module for obtaining the operating pressure of the heat pump system and the operating frequency of the fan; a preset pressure threshold judging module for judging whether the operating pressure is higher than the preset pressure threshold; a fan operating frequency adjusting module for entering the pressure reduction mode when the operating pressure is higher than the preset pressure threshold, and adjusting the operating frequency of the fan according to the first preset condition to increase the operating frequency of the fan. ​ ​ 4. The method of claim 2, wherein the fan control method is characterized by, ​ ​ ​ 5. The method of claim 2, wherein the fan control method is characterized by, ​ ​ ​ ​ ​ ​ 8. A computer device for fan control of a heat pump clothes dryer, adapted to a fan control method of a heat pump clothes dryer as claimed in any one of claims 1 to 7, characterized in that, ​ ​ ​ ​ A preset frequency threshold judging module is configured to judge whether the operating frequency is greater than a preset frequency threshold; A high-voltage early warning signal output module is configured to output a high-voltage early warning signal when the operating frequency is higher than the preset frequency threshold.

9. A heat pump clothes dryer, characterized by Comprise: At least one memory and at least one processor; The memory is configured to store one or more computer programs, which are executed by the processor to implement the steps of the heat pump clothes dryer fan control method according to any one of claims 1-7; When the one or more computer programs are executed by the at least one processor, the at least one processor implements the steps of the method according to any one of claims 1-7.

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