Exhaust valve control methods, computer equipment, and heat pump dryers

Abstract

This invention relates to an exhaust valve control method, a computer device, and a heat pump dryer. The heat pump dryer includes a heat pump system, a drum, a fan, a first exhaust duct, a second exhaust duct, an exhaust valve, and a pressure detection unit. The method includes the following steps: acquiring the operating pressure in the heat pump path and the actual opening degree of the exhaust valve; if the operating pressure is higher than a preset pressure threshold, adjusting the actual opening degree in a proportional relationship with the operating pressure. The purpose of this invention is to provide an exhaust valve control method, a computer device, and a heat pump dryer. This invention adjusts the actual opening degree of the exhaust valve according to the operating pressure of the heat pump system, which can prevent the operating pressure of the heat pump system from being too high. Furthermore, by detecting the operating pressures on the condenser side and the evaporator side of the heat pump system, the heat pump system can be effectively protected in both high-temperature and low-temperature environments.

Description

Technical Field

[0001] This invention relates to the field of heat pump dryer technology, and in particular to an exhaust valve control method, computer equipment, and heat pump dryer. Background Technology

[0002] Existing heat pump dryers are based on the principle of a heat pump system. The compressor compresses and outputs high-temperature, high-pressure refrigerant. This high-temperature, high-pressure refrigerant exchanges heat with the air in the condenser, then enters the throttling element for throttling, and then flows into the evaporator system. The heat in the air forms gaseous refrigerant, which then enters the compressor, completing the cycle. In the condenser, the air exchanges heat with the refrigerant and is heated. The heated air then enters the drum to dry the clothes.

[0003] In existing heat pump dryers, to recover waste heat from the high-temperature air discharged from the drum, the waste heat air is typically passed to the evaporator, where it is absorbed by the evaporator. However, as the heat pump dryer operates, the continuous recovery of waste heat from the high-temperature air discharged from the drum leads to excessive absorption of waste heat by the heat pump system. This causes the evaporator-side pressure (low pressure) of the heat pump system to continuously increase, further resulting in excessively high pressure of the refrigerant delivered by the compressor to the condenser. This can cause high pressure faults to be reported simultaneously on both the high and low pressure sides or on either side. Therefore, a method is needed that can fully recover waste heat without affecting the normal operation of the heat pump dryer. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide an exhaust valve control method, a computer device, and a heat pump dryer. The present invention adjusts the actual opening of the exhaust valve according to the operating pressure of the heat pump system, which can avoid the operating pressure of the heat pump system being too high. Furthermore, by detecting the operating pressure of the condenser side and the evaporator side of the heat pump system, the heat pump system can be effectively protected in both high-temperature and low-temperature environments.

[0005] An exhaust valve control method is disclosed. The heat pump dryer includes a heat pump system, a drum, a fan, a first exhaust duct, a second exhaust duct, an exhaust valve, and a pressure detection unit. The heat pump system includes a condenser and an evaporator connected by pipes. The condenser is disposed on a pipe connected to one end of the drum, and the other end of the drum is connected to the input end of the fan. The output end of the fan is connected to one end of the first exhaust duct. The evaporator is disposed at the other end of the first exhaust duct. The first exhaust duct has an exhaust port. One end of the second exhaust duct is fixed to the inner wall of the exhaust port, and the other end of the second exhaust duct is fixed to the exhaust valve. The pressure detection unit is disposed on the pipes of the heat pump system.

[0006] The exhaust valve control method includes the following steps:

[0007] Obtain the operating pressure of the heat pump system and the actual opening degree of the exhaust valve;

[0008] If the operating pressure is higher than the preset pressure threshold, the actual opening of the exhaust valve is adjusted to the target opening of the exhaust valve according to the preset conditions, so as to reduce the operating pressure of the heat pump system.

[0009] Furthermore, the preset condition is: the target opening degree = (the operating pressure - the preset pressure threshold) × the valve opening degree adjustment coefficient.

[0010] Furthermore, when the target opening degree reaches the first preset target opening degree, a high-pressure warning signal is output; when the target opening degree reaches the second preset target opening degree, the heat pump system is shut down, wherein the first preset target opening degree is less than the second preset target opening degree.

[0011] Furthermore, the highest operating pressure among the multiple locations in the heat pump system is obtained.

[0012] Furthermore, the operating pressure includes the operating pressure on the condenser side of the heat pump system; if the operating pressure on the condenser side is higher than the preset pressure threshold, the actual opening of the exhaust valve is adjusted to the target opening of the exhaust valve. When the ambient temperature is high, the temperature of the air drawn into the heat pump dryer is high, accelerating the rise of the high pressure on the condenser side, causing the pressure on the condenser side to reach the preset pressure threshold more quickly. By installing a pressure detection unit between the compressor output and the condenser input, pressure can be reduced before the condenser side reaches the preset pressure threshold, effectively protecting the compressor when the ambient temperature is high.

[0013] Furthermore, the method includes the following steps: if the actual opening degree is higher than the third preset target opening degree and the operating pressure is lower than the first preset pressure, calculate the target opening degree of the exhaust valve and reduce the actual opening degree of the exhaust valve to the target opening degree; the target opening degree = (first preset pressure - operating pressure) × valve opening adjustment coefficient. The pressure on the condenser side is controlled between the first preset pressure and the preset pressure threshold on the condenser side, ensuring that the pressure on the condenser side of the heat pump dryer is as high as possible without exceeding the preset pressure threshold, thereby ensuring efficient operation of the heat pump dryer and shortening its operating time.

[0014] Furthermore, the operating pressure includes the operating pressure on the evaporator side of the heat pump; if the operating pressure on the evaporator side is higher than the preset pressure threshold, the actual opening of the exhaust valve is adjusted to the target opening of the exhaust valve; if the target opening on the evaporator side is higher than the second preset target opening. When the ambient temperature is low, the temperature of the air drawn into the heat pump dryer is low, which slows down the rate at which the high pressure on the condenser side of the heat pump dryer rises, causing the pressure on the evaporator side of the heat pump dryer to reach the preset pressure threshold more quickly; by setting a pressure detection unit between the output end of the evaporator and the input end of the compressor, the pressure can be reduced before the evaporator side reaches the preset pressure threshold, which can effectively protect the compressor when the ambient temperature is low.

[0015] Furthermore, the method includes the following steps: if the actual opening degree is higher than the third preset target opening degree and the operating pressure is lower than the second preset pressure, calculate the target opening degree of the exhaust valve and reduce the actual opening degree of the exhaust valve to the target opening degree; the target opening degree = (second preset pressure - operating pressure) × valve opening adjustment coefficient. The pressure on the evaporator side is controlled between the second preset pressure and the preset pressure threshold on the evaporator side, ensuring that the pressure on the evaporator side of the heat pump dryer is as high as possible without exceeding the preset pressure threshold, thus ensuring that the heat pump dryer can fully recover waste heat.

[0016] The present invention also provides a computer device for controlling an exhaust valve, comprising: a signal acquisition module for acquiring the operating pressure of a heat pump system and the actual opening degree of the exhaust valve; a preset pressure threshold judgment module for judging whether the operating pressure of the heat pump system is higher than a preset pressure threshold; and a valve opening adjustment module for adjusting the actual opening degree of the exhaust valve to a target opening degree of the exhaust valve according to preset conditions when the operating pressure of the heat pump system is higher than the preset pressure threshold.

[0017] The present invention also provides a heat pump dryer, including at least one memory and at least one processor; the memory is used to store one or more computer programs, which, when executed by the processor, are used to implement the steps of an exhaust valve control method as described in any one of claims 1-8; when the one or more computer programs are executed by the at least one processor, the at least one processor implements the steps of any of the methods described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. By adjusting the actual opening degree of the exhaust valve according to the operating pressure of the heat pump system, the heat pump system can be accurately protected;

[0020] 2. By detecting the operating pressure on the condenser side of the heat pump, the heat pump can be accurately protected in high-temperature environments;

[0021] 3. By detecting the operating pressure on the evaporator side of the heat pump, the heat pump can be accurately protected in low-temperature environments;

[0022] 4. By simultaneously detecting the operating pressure of the heat pump evaporator side and the heat pump condenser side, the heat pump system can be effectively protected in both high-temperature and low-temperature environments. Furthermore, the judgment logic when detecting one or more operating pressures can stably protect the heat pump.

[0023] 5. By setting the first preset pressure and the second preset pressure, the heat pump can achieve the highest possible high-pressure temperature and recover as much waste heat as possible under normal operating conditions;

[0024] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a front structural diagram of a heat pump dryer according to the present invention;

[0026] Figure 2 This is a schematic diagram of the rear structure of a heat pump dryer according to the present invention;

[0027] Figure 3 This is a simplified structural diagram of a heat pump clothes dryer according to the present invention;

[0028] Figure 4 This is a schematic diagram of the computer device for controlling exhaust valves according to the present invention.

[0029] The condenser is 1, and the evaporator is 2.

[0030] 3. Air inlet duct, 4. Roller, 5. Fan, 6. First air duct, 7. Second air duct, 8. Exhaust valve;

[0031] Computer device 9 for controlling exhaust valve, signal acquisition module 901, heat pump threshold judgment module 902, and exhaust valve actual opening adjustment module 903. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0033] It should be understood that the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments.

[0034] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the embodiments in this application.

[0035] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this 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” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0037] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

[0038] This invention provides an exhaust valve control method. For ease of understanding, this invention illustrates the method using a heat pump dryer applicable to the exhaust valve control method described herein. It should be noted that the heat pump dryer illustrated here is merely illustrative. The components that are related to each other can be physically connected or physically separated. For example, the connection between two components can be a direct contact connection or an indirect connection achieved through a third component. Similarly, the fixing of two components can be direct or indirect. Those skilled in the art can select some or all of the modules to achieve the purpose of this disclosure according to actual needs.

[0039] Please see Figure 1 , Figure 2 and Figure 3The heat pump dryer exemplified in this invention includes a heat pump system (not shown), which comprises a compressor (not shown), a condenser 1, and an evaporator 2. The heat pump dryer also includes an air inlet duct 3, a drum 4, a fan 5, a first exhaust duct 6, a second exhaust duct 7, an exhaust valve 8, and several pressure detection units (not shown). For the heat pump system, the output end of the compressor is connected to the input end of the condenser 1, the output end of the condenser 1 is connected to the input end of the evaporator 2, and the output end of the evaporator 2 is connected to the input end of the compressor. Several pressure detection units are installed on the pipeline of heat pump system 1; one end of the air inlet duct 3 is connected to the external environment, the other end of the air inlet duct 3 is connected to one end of the roller 4, the other end of the roller 4 is connected to the input end of the fan 5, the output end of the fan 5 is connected to one end of the first exhaust duct 6, the first exhaust duct 6 is provided with an exhaust port (not shown in the figure), one end of the second exhaust duct 7 is fixed to the inner wall of the exhaust port, and the other end of the second exhaust duct 7 is fixed to the exhaust valve 8; the condenser 1 is fixed to one end of the air inlet duct 3, and the evaporator... The generator 2 is fixed at the other end of the first air duct 6; the operation process of the heat pump dryer is as follows: the fan 5 draws in air from the outside environment into the heat pump dryer. After passing through the condenser 1, the outside air enters the drum 4 from the input end of the drum 4 through the air inlet duct 3. During this process, the outside air first exchanges heat with the condenser 1. After heat exchange, the temperature of the outside air rises and becomes high-temperature air. After entering the drum 4, the high-temperature air exchanges heat with the substances inside the drum 4. After heat exchange, the temperature of the high-temperature air decreases and becomes residual heat air. Due to the exhaust valve 8 in the initial state... When the dryer is in the off state, the residual heat air is discharged to the outside of the heat pump dryer through the first exhaust duct 6 after passing through the fan 5. During this process, since the evaporator 2 is located at the other end of the first exhaust duct 6, the residual heat air will exchange heat with the evaporator 2 before being discharged from the other end of the first exhaust duct 6. After heat exchange, the temperature of the residual heat air will be further reduced and discharged to the outside of the heat pump dryer. During normal operation of the heat pump dryer, if the exhaust valve 8 is opened, a portion of the residual heat air discharged from the drum 4 will be discharged to the outside of the heat pump dryer through the second exhaust duct 7. The exhaust valve control method of the present invention will be described below based on this example heat pump dryer.

[0040] In one embodiment, the heat pump dryer includes only one pressure detection unit, and the exhaust valve control method includes the following steps when operating at room temperature:

[0041] The operating pressure detected by the pressure detection unit and the actual opening degree of the exhaust valve 8 are obtained;

[0042] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the actual opening of the exhaust valve 8 is adjusted to the target opening of the exhaust valve 8 according to the preset conditions, so as to reduce the operating pressure of the heat pump system.

[0043] The preset pressure threshold is the value obtained by subtracting 3.5 bar from the maximum pressure that the compressor can withstand. Therefore, the preset pressure threshold is related to the type of refrigerant and the compressor used. The preset pressure threshold will change according to the refrigerant and the compressor. In a specific embodiment, when the refrigerant is R410a, the maximum pressure that its corresponding model compressor can withstand is about 42 bar, so its preset pressure threshold is 38.5 bar.

[0044] Since the operating pressure detected by the pressure detection unit will change according to the adjustment of the exhaust valve 8, if the opening of the exhaust valve 8 changes too much during the process of adjusting the actual opening of the exhaust valve 8 to the target opening of the exhaust valve 8 according to the preset conditions, the fluctuation of the operating pressure will also increase, which will complicate the adjustment process.

[0045] Therefore, it is necessary to find the relationship between the adjustment of exhaust valve 8 and the change in operating pressure, and to simplify the adjustment process as much as possible.

[0046] In a preferred embodiment, the heat pump dryer includes only one pressure detection unit. When operating at room temperature, the exhaust valve control method includes the following steps:

[0047] The operating pressure detected by the pressure detection unit and the actual opening degree of the exhaust valve 8 are obtained;

[0048] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold, the actual opening of the exhaust valve 8 is adjusted to the target opening of the exhaust valve 8 according to the preset conditions, so as to reduce the operating pressure of the heat pump system.

[0049] Specifically, the preset conditions are: target opening degree = (operating pressure - preset pressure threshold) × damper opening degree adjustment coefficient; where the preset pressure threshold is the value obtained by subtracting 3.5 bar from the maximum pressure that the compressor can withstand. Therefore, 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 in refrigerant and compressor. The damper opening degree adjustment coefficient is adjusted according to the following principles: First, the principle of not reporting high pressure, that is, the opening degree of the damper should be adjusted to the maximum before the operating pressure reaches the preset pressure threshold. For example, when the preset pressure threshold is 29.5, it must be ensured that the exhaust damper 5 must be fully open when the pressure is at most 29.5. Second, the principle of not over-adjusting, that is, the opening degree adjustment of the damper should not be too large. For example, when it is necessary to maintain the operating pressure at 28, it is not possible for the operating pressure to drop below 28 after the actual opening degree is adjusted to the target opening degree. Therefore, the damper opening degree adjustment coefficient is affected by the refrigerant properties, the setting of the high pressure warning value, and the action time of the damper itself, and needs to be determined according to the actual situation.

[0050] When the target opening degree reaches the first preset target opening degree, a high-pressure warning signal is output; when the target opening degree reaches the second preset target opening degree, the heat pump system is shut down. The first preset target opening degree is less than 90°, and the second preset target opening degree is 90°. 90° represents the air valve being fully open. The first preset target opening degree should be set according to the specific situation of the equipment, so that after receiving the high-pressure warning signal, there is enough time for on-site personnel to analyze and adjust before the target opening degree reaches the second target opening degree. When the equipment structure is complex, the first preset target opening degree can be appropriately reduced; when the equipment structure is simple and the change in operating pressure is gradual, the first preset target opening degree can be appropriately increased.

[0051] During the operation of a heat pump dryer, the condenser 1 comes into direct contact with and exchanges heat with the outside air. Therefore, when the heat pump dryer is running in a high-temperature environment, the high temperature of the air drawn into the dryer will accelerate the pressure rise on the condenser side (between the condenser 1 and the compressor), causing the pressure on the condenser side to reach the preset pressure threshold faster than in a normal temperature environment. Therefore, a pressure detection unit needs to be installed between the output end of the compressor and the input end of the condenser 1, and the opening method of the exhaust valve 8 needs to be adjusted to ensure that the heat pump dryer can be effectively protected even when operating in a high-temperature environment.

[0052] In an optional embodiment, the heat pump dryer includes only one pressure detection unit, which is located between the output end of the compressor and the input end of the condenser 1 (i.e., the condenser side). The heat pump dryer operates in a high-temperature environment, and the exhaust valve control method includes the following steps:

[0053] The operating pressure detected by the pressure detection unit and the actual opening degree of the exhaust valve 8 are obtained.

[0054] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold on the condenser side, the actual opening of the exhaust valve 8 is adjusted to the target opening of the exhaust valve 8 according to the preset conditions, so as to reduce the operating pressure of the heat pump system.

[0055] In particular, because the pressure on the condenser side of the heat pump dryer increases faster in high-temperature environments compared to normal temperatures, a new preset pressure threshold for the condenser side is set to allow the adjustment of the exhaust valve 8 more response time. The preset pressure threshold for the condenser side is the value obtained by subtracting 2 bar from the aforementioned preset pressure threshold, that is, the preset pressure threshold for the condenser side is the value obtained by subtracting 5.5 bar from the maximum pressure that the compressor can withstand. 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 in the refrigerant and the compressor.

[0056] Furthermore, in order to ensure that the pressure on the condenser side is as high as possible without exceeding a preset pressure threshold when the heat pump dryer operates in a high-temperature environment, thereby ensuring efficient operation and shortening the operating time of the heat pump dryer; in a preferred embodiment, the exhaust valve control method further includes the following steps:

[0057] If the actual opening is higher than the third preset target opening and the operating pressure is lower than the first preset pressure, calculate the target opening of the exhaust valve 8 and reduce the actual opening of the exhaust valve to the target opening. The formula for calculating the target opening is: Target opening = (first preset pressure - operating pressure) × valve opening adjustment coefficient.

[0058] In this embodiment, the third preset target opening degree is 0. The purpose of determining that the actual opening degree is higher than the third preset target opening degree is to confirm that the current exhaust valve 8 is in the open state, meaning that the current operating pressure can be increased by adjusting the opening degree of the exhaust valve 8. The first preset pressure is the minimum pressure that ensures efficient operation of the heat pump dryer under high-temperature conditions. The first preset pressure should be determined experimentally based on the specific circumstances of different equipment. Therefore, this embodiment ensures efficient operation of the heat pump dryer by controlling the pressure on the condenser side between the first preset pressure and the preset pressure threshold on the condenser side.

[0059] During the operation of a heat pump dryer, the condenser 1 directly contacts and exchanges heat with the outside air. Therefore, when the heat pump dryer is operating in a low-temperature environment, the temperature of the air drawn into the dryer is low, which slows down the pressure rise on the condenser side (between the condenser 1 and the compressor), or even prevents the pressure on the condenser side from rising. During this process, because the evaporator side (between the evaporator 2 and the compressor) continuously recovers waste heat, the temperature on the evaporator side will continue to rise, which may cause the pressure on the evaporator side to reach the preset pressure threshold faster than that on the condenser side. Therefore, a pressure detection unit needs to be installed between the output end of the evaporator 2 and the input end of the compressor, and the opening adjustment method of the exhaust valve 8 needs to be adjusted to ensure that the heat pump dryer can be effectively protected even when operating in a low-temperature environment.

[0060] In an optional embodiment, the heat pump dryer includes only one pressure detection unit, which is located between the output end of the evaporator 2 and the input end of the compressor (i.e., the evaporation side). The heat pump dryer operates in a low-temperature environment, and the exhaust valve control method includes the following steps:

[0061] The operating pressure detected by the pressure detection unit and the actual opening degree of the exhaust valve 8 are obtained.

[0062] If the operating pressure detected by the pressure detection unit is higher than the preset pressure threshold on the evaporator side, the actual opening of the exhaust valve 8 is adjusted to the target opening of the exhaust valve 8 according to the preset conditions, so as to reduce the operating pressure of the heat pump system.

[0063] In particular, because the pressure on the evaporator side of the heat pump dryer increases faster in high-temperature environments compared to normal-temperature environments, a new preset pressure threshold for the evaporator side is set to allow the adjustment of the exhaust valve 8 more response time. The preset pressure threshold for the evaporator side is the value obtained by adding 1 bar to the aforementioned preset pressure threshold, that is, the preset pressure threshold for the evaporator side is the value obtained by subtracting 2.5 bar from the maximum pressure that the compressor can withstand. 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 in the refrigerant and the compressor.

[0064] Furthermore, in order to ensure that the pressure on the evaporator side is as high as possible while not exceeding a preset pressure threshold on the evaporator side when the heat pump dryer is operating in a low-temperature environment, and to ensure that the heat pump dryer can fully recover waste heat, in a preferred embodiment, the exhaust valve control method further includes the following steps:

[0065] If the actual opening is higher than the third preset target opening and the operating pressure is lower than the second preset pressure, calculate the target opening of the exhaust valve 8 and reduce the actual opening of the exhaust valve to the target opening. The formula for calculating the target opening is: Target opening = (Second preset pressure - Operating pressure) × Valve opening adjustment coefficient.

[0066] The third preset target opening degree is 0. In this embodiment, the purpose of determining that the actual opening degree is higher than the third preset target opening degree is to confirm that the current exhaust valve 8 is in the open state, that is, the current operating pressure can be increased by adjusting the opening degree of the exhaust valve 8. The second preset pressure is the minimum pressure that can ensure the efficient operation of the heat pump dryer under low temperature conditions. The second preset pressure should be determined experimentally according to the specific conditions of different equipment. Therefore, this embodiment controls the pressure on the condenser side between the second preset pressure and the preset pressure threshold on the condenser side to ensure that the heat pump dryer can fully recover waste heat and operate efficiently.

[0067] To further ensure that the pressure at all points of the heat pump system 1 does not exceed the preset pressure threshold, multiple pressure detection units can be installed at various points in the heat pump system 1.

[0068] In an optional embodiment, the heat pump dryer includes two pressure detection units, respectively disposed 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. The exhaust valve control method further includes the following steps:

[0069] Obtain the two operating pressures detected by the two pressure detection units and the actual opening degree of the exhaust valve 8;

[0070] If the operating pressure detected by both pressure detection units is higher than the preset pressure threshold, the operating pressure with the highest value is taken as the benchmark, and the actual opening of the exhaust valve 8 is adjusted to the target opening of the exhaust valve 8 according to the preset conditions to reduce the operating pressure of the heat pump system.

[0071] The preset pressure threshold is the value obtained by subtracting 3.5 bar from the maximum pressure that the compressor can withstand. Therefore, the preset pressure threshold is related to the type of refrigerant and the compressor used. The preset pressure threshold will change according to the refrigerant and the compressor. In a specific embodiment, when the refrigerant is R410a, the maximum pressure that its corresponding model compressor can withstand is about 42 bar, so its preset pressure threshold is 38.5 bar.

[0072] Secondly, the present invention also provides a computer device 9 for controlling an exhaust valve, such as... Figure 4 As shown, the computer device includes:

[0073] The signal acquisition module 901 is used to acquire the operating pressure of the heat pump system and the actual opening degree of the exhaust valve.

[0074] The heat pump operating preset pressure threshold judgment module 902 is used to determine whether the operating pressure of the heat pump system is higher than the preset pressure threshold.

[0075] The exhaust valve actual opening adjustment module 903 is used to adjust the actual opening of the exhaust valve to the target opening of the exhaust valve according to preset conditions when the operating pressure of the heat pump system is higher than the preset pressure threshold.

[0076] In a preferred embodiment, the computer device further includes:

[0077] The target opening calculation module is used to calculate the target opening of the exhaust valve according to the calculation formula: target opening = (operating pressure - preset pressure threshold) × valve opening adjustment coefficient;

[0078] In a preferred embodiment, the computer device further includes:

[0079] The first preset target opening degree judgment module is used to determine whether the target opening degree has reached the first preset target opening degree;

[0080] The high-voltage warning signal output module is used to output a high-voltage warning signal when the target opening degree is higher than the first preset target opening degree;

[0081] The second preset target opening degree judgment module is used to determine whether the target opening degree has reached the second preset target opening degree;

[0082] The heat pump system protection module is used to shut down the heat pump system when the target opening degree reaches the second preset target opening degree.

[0083] In a preferred embodiment, the computer device further includes:

[0084] The highest operating pressure determination module is used to determine the highest operating pressure among multiple pressure values ​​of the heat pump system.

[0085] In a preferred embodiment, the computer device further includes:

[0086] The condenser-side preset pressure threshold judgment module is used to determine whether the operating pressure is higher than the condenser-side preset pressure threshold.

[0087] The condenser-side target opening adjustment module is used to adjust the actual opening of the exhaust valve to the target opening of the exhaust valve according to preset conditions when the operating pressure is higher than the preset pressure threshold on the condenser side.

[0088] In a preferred embodiment, the computer device further includes:

[0089] The third preset target opening degree judgment module is used to determine whether the actual opening degree is higher than the third preset target opening degree;

[0090] The first preset pressure judgment module is used to determine whether the operating pressure is lower than the first preset pressure.

[0091] The first adjustment calculation module is used to calculate the target opening after reduction according to the formula: target opening = (first preset pressure - operating pressure) × valve opening adjustment coefficient when the actual opening is higher than the third preset opening and the operating pressure is lower than the first preset pressure.

[0092] The first opening reduction module is used to reduce the actual opening of the exhaust valve to the target opening when the actual opening is higher than the third preset opening and the operating pressure is lower than the first preset pressure.

[0093] In a preferred embodiment, the computer device further includes:

[0094] The evaporator-side preset pressure threshold judgment module is used to determine whether the operating pressure is higher than the evaporator-side preset pressure threshold.

[0095] The evaporator-side target opening adjustment module is used to adjust the actual opening of the exhaust valve to the target opening of the exhaust valve according to preset conditions when the operating pressure is higher than the preset pressure threshold on the evaporator side.

[0096] In a preferred embodiment, the computer device further includes:

[0097] The third preset target opening degree judgment module is used to determine whether the actual opening degree is higher than the third preset target opening degree;

[0098] The second preset pressure judgment module is used to determine whether the operating pressure is lower than the second preset pressure.

[0099] The second adjustment calculation module is used to calculate the target opening after reduction according to the formula: target opening = (second preset pressure - operating pressure) × valve opening adjustment coefficient when the actual opening is higher than the third preset opening and the operating pressure is lower than the second preset pressure.

[0100] The second opening reduction module is used to reduce the actual opening of the exhaust valve to the target opening when the actual opening is higher than the third preset opening and the operating pressure is lower than the second preset pressure.

[0101] For the computer device embodiments, since they basically correspond to the method embodiments, relevant details can be found in the descriptions of the method embodiments. The computer device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, computer devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0102] Thirdly, the present invention also provides a heat pump dryer, including at least one memory and at least one processor;

[0103] The memory is used to store one or more computer programs, which, when executed by the at least one processor, cause the at least one processor to implement the steps of the exhaust valve control method described above.

[0104] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0105] 1. By adjusting the opening of the exhaust valve 8 under the pressure of the heat pump system 1, the heat pump system 1 can be accurately protected;

[0106] 2. By installing a pressure detection unit on the condenser side of the compressor, the heat pump system 1 can be accurately protected in high-temperature environments;

[0107] 3. By installing a pressure detection unit on the evaporator side of the compressor, the heat pump system 1 can be accurately protected in low-temperature environments;

[0108] 4. By setting pressure detection units on both the evaporator and condenser sides of the compressor, the heat pump system 1 can be effectively protected in both high-temperature and low-temperature environments. Furthermore, the judgment logic is defined when multiple pressure detection units are present, which can stably protect the compressor.

[0109] 5. By setting the first preset pressure and the second preset pressure, the compressor can achieve the highest possible high-pressure temperature and recover as much waste heat as possible under normal operating conditions;

[0110] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A method for controlling an exhaust valve, characterized in that: The heat pump dryer includes a heat pump system, a drum, a fan, a first exhaust duct, a second exhaust duct, an exhaust valve, and a pressure detection unit. The heat pump system includes a condenser and an evaporator connected by pipes. The condenser is installed on a pipe connected to one end of the drum, and the other end of the drum is connected to the input end of the fan. The output end of the fan is connected to one end of the first exhaust duct. The evaporator is installed at the other end of the first exhaust duct. The first exhaust duct has an exhaust port. One end of the second exhaust duct is fixed to the inner wall of the exhaust port, and the other end of the second exhaust duct is fixed to the exhaust valve. The pressure detection unit is installed on the pipes of the heat pump system. The exhaust valve control method includes the following steps: The operating pressure of the heat pump system and the actual opening degree of the exhaust valve are obtained; the operating pressure includes the operating pressure on the condenser side of the heat pump system and the operating pressure on the evaporator side of the heat pump system. If the operating pressure on the condenser side is higher than the preset pressure threshold on the condenser side or the operating pressure on the evaporator side is higher than the preset pressure threshold on the evaporator side, the actual opening of the exhaust valve is adjusted to the target opening of the exhaust valve according to the preset conditions, so as to reduce the operating pressure of the heat pump system. If the actual opening degree is higher than the third preset target opening degree and the operating pressure on the condenser side is lower than the first preset pressure, calculate the target opening degree of the exhaust valve and reduce the actual opening degree of the exhaust valve to the target opening degree; The target opening degree = (first preset pressure - operating pressure on the condenser side) × damper opening degree adjustment coefficient; If the actual opening degree is higher than the third preset target opening degree and the operating pressure on the evaporator side is lower than the second preset pressure, calculate the target opening degree of the exhaust valve and reduce the actual opening degree of the exhaust valve to the target opening degree; The target opening degree = (second preset pressure - operating pressure on the evaporator side) × damper opening degree adjustment coefficient.

2. The exhaust valve control method according to claim 1, characterized in that: The preset condition is: the target opening degree = (the operating pressure - the preset pressure threshold) × the valve opening degree adjustment coefficient.

3. The exhaust valve control method according to claim 2, characterized in that: When the target opening degree reaches the first preset target opening degree, a high-voltage warning signal is output; When the target opening degree reaches the second preset target opening degree, the heat pump system is shut down, where the first preset target opening degree is less than the second preset target opening degree.

4. The exhaust valve control method according to any one of claims 1-3, characterized in that: Obtain the highest operating pressure among multiple locations in the heat pump system pressure value.

5. A computer device for controlling an exhaust valve, applicable to the exhaust valve control method according to any one of claims 1-3, characterized in that, include: The signal acquisition module is used to acquire the operating pressure of the heat pump system and the actual opening degree of the exhaust valve. A preset pressure threshold judgment module is used to determine whether the operating pressure of the heat pump system is higher than a preset pressure threshold. The air valve opening adjustment module is used to adjust the actual opening of the exhaust air valve to the target opening of the exhaust air valve according to preset conditions when the operating pressure of the heat pump system is higher than the preset pressure threshold.

6. A heat pump clothes dryer, characterized in that, include: At least one memory and at least one processor; The memory is used to store one or more computer programs, which, when executed by a processor, are used to implement the steps of an exhaust valve control method as described in any one of claims 1-4. When the one or more computer programs are executed by the at least one processor, the at least one processor performs the steps of the method as described in any one of claims 1-4.

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