A method for controlling the temperature of evaporator fins in a dryer based on a frequency-modulated fan.

Abstract

This invention provides a method for controlling the temperature of evaporator fins in a dryer based on a frequency-modulated fan, relating to the field of dryer temperature control technology. The method includes: acquiring the evaporator fin temperature and the drying chamber temperature; comparing the fin temperature and the drying chamber temperature with a preset fin temperature to determine whether to generate a compressor start / stop command and a fan speed adjustment command; setting a preset fin temperature rating, including an upper and lower preset fin temperature value; controlling the compressor's operating status according to the generated compressor start / stop command, and controlling the speeds of the corresponding internal and external circulation fans according to the fan speed adjustment command; and acquiring the evaporator fin temperature and the drying chamber temperature in various ways to better adapt to changes in the evaporator fin temperature and the drying chamber temperature, resulting in high adjustment efficiency.

Description

Technical Field

[0001] This invention relates to the field of dryer temperature control technology, and in particular to a method for controlling the temperature of dryer evaporator fins based on a frequency-modulated fan. Background Technology

[0002] The existing methods for maintaining a balanced temperature inside drying rooms mostly involve directly obtaining the internal temperature of the drying room. When the temperature exceeds the preset value, the operating efficiency of the fan is increased to accelerate the airflow interaction between the inside and outside of the drying room. When the temperature is below the preset value, the operating efficiency of the fan is reduced to slow down the airflow interaction between the inside and outside of the drying room, thereby maintaining a balanced temperature inside the drying room. This control method is simplistic and takes a lot of time to maintain a balanced temperature inside the drying room, resulting in low adjustment efficiency.

[0003] Therefore, in view of the shortcomings of the existing technology, this paper provides a method for controlling the temperature of the evaporator fins of a dryer based on a frequency-modulated fan. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a method for controlling the temperature of evaporator fins in a dryer based on a frequency-modulated fan.

[0005] This invention solves the above-mentioned technical problems through the following technical means: a method for controlling the temperature of evaporator fins in a dryer based on a frequency-modulated fan, the method comprising:

[0006] Collect the temperature of the evaporator fins and the temperature of the drying chamber;

[0007] The fin temperature and drying chamber temperature are compared with the preset fin temperature to determine whether to generate compressor start / stop commands and fan speed adjustment commands.

[0008] Set the preset temperature rating for the fins, which includes the upper limit and the lower limit of the preset temperature for the fins;

[0009] The compressor's operating status is controlled according to the generated compressor start / stop command, and the speed of the corresponding internal circulation fan and external circulation fan is controlled according to the fan speed adjustment command.

[0010] The fan speed includes high, medium, low and neutral speeds, and the fans include internal circulation fans and external circulation fans.

[0011] Furthermore, if both the fin temperature and the drying chamber temperature are less than the upper limit of the preset fin temperature and greater than the lower limit of the preset fin temperature, or if the fin temperature is greater than or equal to the upper limit of the preset fin temperature and the drying chamber temperature is less than the upper limit of the preset fin temperature and greater than the lower limit of the preset fin temperature, then a compressor cut-off command, an internal fan low-speed command, and an external fan neutral-speed command are generated. The compressor circuit control module is a compressor cut-off circuit, and the fan control module sets the external circulation fan speed to neutral according to the external fan neutral-speed command. The fan control module sets the internal circulation fan speed to low speed according to the internal fan low-speed command.

[0012] If the fin temperature and the drying room temperature are both greater than or equal to the preset upper limit of the fin temperature, a compressor cut-off command, an internal fan high-speed command, and an external fan high-speed command are generated. The compressor circuit control module is the compressor cut-off circuit, and the compressor stops running. The fan control module sets the speed of the internal circulation fan and the speed of the external circulation fan to high speed according to the internal fan high-speed command and the external fan high-speed command, respectively.

[0013] If the fin temperature is greater than or equal to the preset upper limit of the fin temperature and the drying room temperature is less than or equal to the preset lower limit of the fin temperature, or if the fin temperature is less than the preset upper limit of the fin temperature but greater than the preset lower limit of the fin temperature and the drying room temperature is less than or equal to the preset upper limit of the fin temperature, then a compressor start command, an internal fan medium speed command, and an external fan neutral speed command are generated. The compressor circuit control module turns on the compressor circuit, and the compressor runs. The fan control module sets the internal circulation fan speed to medium speed according to the internal fan medium speed command, and sets the external circulation fan speed to neutral speed according to the external fan neutral speed command.

[0014] If both the fin temperature and the drying chamber temperature are less than or equal to the preset upper limit of the fin temperature, a compressor start command, an internal fan medium speed command, and an external fan neutral speed command are generated. The compressor circuit control module starts the compressor circuit, and the compressor runs. The fan control module sets the internal circulation fan speed to medium speed according to the internal fan medium speed command, and sets the external circulation fan speed to neutral according to the external fan neutral speed command.

[0015] Furthermore, the internal circulation fans and external circulation fans are labeled as monitoring objects;

[0016] The system acquires the operating status values ​​of the monitored objects, including bearing temperature, vibration, voltage influence, and current influence. It generates an inherent influence coefficient based on the temperature and vibration values, and then generates emergency and general inherent influence labels for the corresponding monitored objects based on the magnitude of these coefficients. It also generates a power supply influence coefficient based on the voltage and current influence values, and then generates emergency and general power supply influence labels for the corresponding monitored objects based on the magnitude of these coefficients.

[0017] Based on the generated impact labels, emergency warning instructions and general warning instructions are generated for the corresponding monitored objects.

[0018] Furthermore, the bearing temperature value is the bearing temperature value of the monitored object, and the vibration value is the vibration value of the monitored object; the voltage influence value uyz calculation steps include: marking the actual voltage value of the monitored object as u1, and marking the difference between the upper limit of the rated voltage and the lower limit of the rated voltage of the monitored object as u2. The calculation steps for the current influence value Iyz include: marking the actual current value of the monitored object as I1, and marking the difference between the upper limit and lower limit of the rated current of the monitored object as I2.

[0019] Furthermore, the steps for generating emergency self-influence labels and general self-influence labels include: labeling the bearing temperature value and vibration value as zwi and zdi respectively, where i represents the number of monitored objects and is an integer greater than 0; performing formulaic analysis on them to obtain the self-influence coefficient ZSxi;

[0020] Set a threshold for the range of self-influence coefficients. If the self-influence coefficient ZSxi is greater than or equal to the maximum value of the self-influence coefficient range threshold, then generate an emergency self-influence label for the corresponding monitored object.

[0021] If the self-influence coefficient ZSxi is less than the maximum value of the self-influence coefficient range threshold and greater than the minimum value of the self-influence coefficient range threshold, then a general self-influence label is generated for the corresponding monitored object.

[0022] If the self-influence coefficient ZSxi is less than or equal to the minimum threshold value of the self-influence coefficient range, then no influence label will be generated for the corresponding monitored object.

[0023] Furthermore, the steps for generating emergency power supply impact labels and general power supply impact labels include labeling the voltage impact value and the current impact value as uyzi and Iyzi respectively, performing formulaic analysis on them, and obtaining the power supply impact coefficient Gnxi;

[0024] Set a threshold range for the energy supply impact coefficient. If the energy supply impact coefficient Gnxi is greater than or equal to the maximum value of the energy supply impact coefficient range threshold, then generate an emergency energy supply impact label for the corresponding monitored object.

[0025] If the energy supply impact coefficient Gnxi is less than the maximum value of the energy supply impact coefficient range threshold and greater than the minimum value of its own impact coefficient range threshold, then a general energy supply impact label is generated for the corresponding monitored object.

[0026] If the energy supply impact coefficient Gnxi is less than or equal to the minimum value of the energy supply impact coefficient range threshold, then no impact label will be generated for the corresponding monitored object.

[0027] Furthermore, the steps for generating emergency warning instructions and general warning instructions include:

[0028] If any monitored object has both an emergency self-impact label and an emergency power supply impact label, an emergency warning instruction will be generated for the corresponding monitored object; if any monitored object has both an emergency self-impact label and a general power supply impact label, or an emergency power supply impact label and a general self-impact label, a general warning instruction will be generated for the corresponding monitored object; if any monitored object has both a general self-impact label and a general power supply impact label, no warning instruction will be generated for the corresponding monitored object.

[0029] The beneficial effects of this invention are:

[0030] By acquiring the temperature of the evaporator fins in the dryer and the temperature inside the drying chamber, the operating status of the external circulation fan, internal circulation fan, and compressor can be controlled accordingly based on changes in these temperatures. This allows for diverse adjustment methods, better adapting to variations in both the evaporator fin temperature and the temperature inside the drying chamber, maintaining dynamic temperature balance within the drying chamber, reducing energy consumption, increasing energy efficiency, and quickly adjusting the temperature inside the drying chamber to a suitable level with high adjustment efficiency. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0033] Example 1

[0034] The method for controlling the temperature of the evaporator fins in a dryer based on a frequency-modulated fan, as described in this embodiment, includes:

[0035] The system collects the temperatures of the evaporator fins and the drying chamber. The evaporator fin temperature is obtained from temperature sensors installed on the surface of the evaporator fins, while the drying chamber temperature is the average value obtained from different temperatures within the drying chamber. The evaporator fin temperature is the superposition of the temperatures of the gas passing through the evaporator fin surface and the flowing medium in the evaporator. Combining the evaporator fin temperature and the drying chamber temperature provides a better reflection of the temperature within the drying chamber.

[0036] The fin temperature and drying chamber temperature are compared with the preset fin temperature to determine whether to generate compressor start / stop commands and fan speed adjustment commands.

[0037] Set the fin preset temperature rating, which includes the upper limit and lower limit of the fin preset temperature. The fin preset temperature rating is set according to the material to be dried in the drying room.

[0038] The fan speed settings include high, medium, low, and neutral. The fans include internal circulation fans and external circulation fans. According to the fan speed from high to low, the settings are high, medium, low, and neutral. Neutral means the fan stops rotating.

[0039] The compressor's operating status is controlled according to the generated compressor start / stop command, and the speed of the corresponding internal circulation fan and external circulation fan is controlled according to the fan speed adjustment command.

[0040] The internal circulation fan is mainly responsible for the airflow circulation inside the drying room, while the external circulation fan is mainly responsible for the airflow interaction between the inside and outside of the drying room.

[0041] If both the fin temperature and the drying chamber temperature are less than the upper limit of the preset fin temperature and greater than the lower limit of the preset fin temperature, it indicates that the temperature inside the drying chamber is suitable. At this point, a compressor cut-off command, an internal fan low-speed command, and an external fan neutral-speed command are generated. The compressor circuit control module is set to the compressor cut-off circuit, and the compressor stops running after being cut off. The evaporator stops dissipating heat. Based on the external fan neutral-speed command, the fan control module sets the external circulation fan speed to neutral, and the external fan stops running. Based on the internal fan low-speed command, the fan control module sets the internal circulation fan speed to low, maintaining gas circulation in the drying chamber and increasing the residence time of the heat source inside the drying chamber. This ensures that the suitable temperature fully contacts every part of the material, improving the drying effect.

[0042] If both the fin temperature and the drying chamber temperature are greater than or equal to the preset upper limit of the fin temperature, it indicates that the evaporator is dissipating too much heat and the drying chamber temperature is too high. At this time, a compressor cut-off command, an internal fan high-speed command, and an external fan high-speed command are generated. The compressor circuit control module sets the compressor cut-off circuit, the compressor stops running, and the evaporator stops dissipating heat. The fan control module sets the speed of both the internal and external circulation fans to high speed according to the internal fan high-speed command and the external fan high-speed command, respectively. The external circulation fan exchanges the airflow inside and outside the drying chamber to achieve the purpose of rapid cooling of the drying chamber, quickly reducing the temperature inside the drying chamber to a moderate state, and quickly maintaining the temperature inside the drying chamber dynamically at a moderate state to ensure the drying effect of the materials inside the drying chamber.

[0043] If the fin temperature is greater than or equal to the preset upper limit of the fin temperature and the drying chamber temperature is less than or equal to the preset lower limit of the fin temperature, or if the fin temperature is less than the preset upper limit of the fin temperature but greater than the preset lower limit of the fin temperature and the drying chamber temperature is less than or equal to the preset upper limit of the fin temperature, it indicates that the temperature inside the drying chamber is too low and the evaporator still needs to provide heat. At this time, a compressor start command, an internal fan medium speed command, and an external fan neutral speed command are generated. The compressor circuit control module starts the compressor circuit, the compressor runs, and the evaporator continuously dissipates heat. According to the internal fan medium speed command, the fan control module sets the internal circulation fan speed to medium speed. According to the external fan neutral speed command, the fan control module sets the external circulation fan speed to neutral speed. The internal circulation fan evenly distributes the dissipated heat inside the drying chamber, so that the heat source moves slowly inside the drying chamber, fully contacts the material, improves the drying effect, and quickly adjusts the temperature inside the drying chamber to a moderate state.

[0044] If both the fin temperature and the drying chamber temperature are less than or equal to the preset upper limit of the fin temperature, it indicates that the compressor may be stopped and needs to be restarted to allow the evaporator to continuously dissipate heat. At this time, a compressor start command, an internal fan medium speed command, and an external fan neutral speed command are generated. The compressor circuit control module activates the compressor circuit. Based on the internal fan medium speed command, the fan control module sets the internal circulation fan speed to medium. Based on the external fan neutral speed command, the fan control module sets the external circulation fan speed to neutral. The compressor runs, the evaporator continuously dissipates heat, and the internal circulation fan evenly distributes the dissipated heat within the drying chamber, increasing the residence time of the heat source inside the drying chamber and adjusting the temperature inside the drying chamber to a suitable level.

[0045] By acquiring the temperature of the evaporator fins in the dryer and the temperature inside the drying chamber, the operating status of the external circulation fan, internal circulation fan, and compressor can be controlled accordingly based on changes in these temperatures. This allows for diverse adjustment methods, better adapting to variations in both the evaporator fin temperature and the temperature inside the drying chamber, maintaining dynamic temperature balance within the drying chamber, reducing energy consumption, increasing energy efficiency, and quickly adjusting the temperature inside the drying chamber to a suitable level with high adjustment efficiency.

[0046] Example 2

[0047] To further ensure the dynamic balance of temperature within the drying chamber, the control method also monitors the operating status of the internal and external circulation fans, marking them as monitoring targets.

[0048] The system acquires the operating status values ​​of the monitored objects, including bearing temperature, vibration, voltage influence, and current influence. It generates an inherent influence coefficient based on the temperature and vibration values, and generates emergency and general inherent influence labels for the corresponding monitored objects based on the magnitude of the inherent influence coefficient. It also generates a power supply influence coefficient based on the voltage and current influence values, and generates emergency and general power supply influence labels for the corresponding monitored objects based on the magnitude of the power supply influence coefficient.

[0049] The bearing temperature value mentioned above is the bearing temperature value of the monitored object, obtained by a surface-mount temperature sensor. The vibration value is the vibration value of the monitored object, obtained by a corresponding vibration sensor. The calculation steps for the voltage influence value uyz include: marking the actual voltage value of the monitored object as u1, and marking the difference between the upper limit and lower limit of the rated voltage of the monitored object as u2. The calculation steps for the current influence value Iyz include: marking the actual current value of the monitored object as I1, and marking the difference between the upper limit and lower limit of the rated current of the monitored object as I2.

[0050] The steps for generating emergency self-influence labels and general self-influence labels include: labeling the bearing temperature value and vibration value as zwi and zdi respectively, where i represents the number of monitored objects and is an integer greater than 0; and calculating the self-influence coefficient ZSxi according to the formula ZSxi=e1*zwi+e2*zdi, where e1 and e2 are preset proportional coefficients, and the values ​​of e1 and e2 are both greater than 0, e1>e2>0.

[0051] It should be noted that the smaller the self-influence coefficient ZSxi value, the smaller the impact on the operation of the monitored object, and vice versa.

[0052] Set a threshold for the range of self-influence coefficients. If the self-influence coefficient ZSxi is greater than or equal to the maximum value of the self-influence coefficient range threshold, then generate an emergency self-influence label for the corresponding monitored object.

[0053] If the self-influence coefficient ZSxi is less than the maximum value of the self-influence coefficient range threshold and greater than the minimum value of the self-influence coefficient range threshold, then a general self-influence label is generated for the corresponding monitored object.

[0054] If the self-influence coefficient ZSxi is less than or equal to the minimum threshold value of the self-influence coefficient range, then no influence label will be generated for the corresponding monitored object.

[0055] The steps for generating emergency power supply impact labels and general power supply impact labels include labeling the voltage impact value and the current impact value as uyzi and Iyzi respectively, and calculating the power supply impact coefficient Gnxi according to the formula Gnxi=a1*uyzi+a2*Iyzi, where a1 and a2 are preset proportional coefficients, and the values ​​of a1 and a2 are both greater than 0, a1>a2>0.

[0056] It should be noted that the smaller the energy supply impact coefficient Gnxi value, the smaller the impact on the operation of the monitored object, and vice versa.

[0057] Set a threshold range for the energy supply impact coefficient. If the energy supply impact coefficient Gnxi is greater than or equal to the maximum value of the energy supply impact coefficient range threshold, then generate an emergency energy supply impact label for the corresponding monitored object.

[0058] If the energy supply impact coefficient Gnxi is less than the maximum value of the energy supply impact coefficient range threshold and greater than the minimum value of its own impact coefficient range threshold, then a general energy supply impact label is generated for the corresponding monitored object.

[0059] If the energy supply impact coefficient Gnxi is less than or equal to the minimum value of the energy supply impact coefficient range threshold, then no impact label will be generated for the corresponding monitored object.

[0060] Based on the impact markers of the corresponding monitored objects, emergency warning commands and general warning commands are generated; the steps for generating emergency warning commands and general warning commands include:

[0061] If any monitored object has both an emergency self-impact label and an emergency power supply impact label, an emergency warning instruction will be generated for the corresponding monitored object; if any monitored object has both an emergency self-impact label and a general power supply impact label, or an emergency power supply impact label and a general self-impact label, a general warning instruction will be generated for the corresponding monitored object; if any monitored object has both a general self-impact label and a general power supply impact label, no warning instruction will be generated for the corresponding monitored object.

[0062] Before the internal and external circulation fans become completely unusable, data on their impact on the operating status is acquired and analyzed. Real-time warnings of different levels are issued for different internal and external circulation fans, allowing technicians to maintain the corresponding internal and external circulation fans according to the different levels of warnings. This ensures the normal operation of the internal and external circulation fans, maintains the dynamic balance of temperature in the drying room, and can quickly adjust the temperature in the drying room to a moderate state.

[0063] Monitoring objects with emergency warning commands have a higher maintenance priority than those with general warning commands. This allows technicians to maintain the monitoring objects in an orderly manner when there are many maintenance commands, ensuring the normal operation of the monitoring objects to the greatest extent possible.

[0064] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters and thresholds in the formulas are set by those skilled in the art according to the actual situation.

[0065] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0066] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0067] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0068] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0069] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0070] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0071] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0073] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for controlling the temperature of evaporator fins in a dryer based on a frequency-modulated fan, characterized in that, The method includes: Collect the temperature of the evaporator fins and the temperature of the drying chamber; The fin temperature and drying chamber temperature are compared with the preset fin temperature to determine whether to generate compressor start / stop commands and fan speed adjustment commands. Set the preset temperature rating for the fins, which includes the upper limit and the lower limit of the preset temperature for the fins; The compressor's operating status is controlled according to the generated compressor start / stop command, and the speed of the corresponding internal circulation fan and external circulation fan is controlled according to the fan speed adjustment command. Fan speeds include high, medium, low, and neutral; fans include internal circulation fans and external circulation fans. Label the internal circulation fans and external circulation fans as monitoring objects; The system acquires the operating status values ​​of the monitored objects, including bearing temperature, vibration, voltage influence, and current influence. It generates an inherent influence coefficient based on the temperature and vibration values, and then generates emergency and general inherent influence labels for the corresponding monitored objects based on the magnitude of these coefficients. It also generates a power supply influence coefficient based on the voltage and current influence values, and then generates emergency and general power supply influence labels for the corresponding monitored objects based on the magnitude of these coefficients. Based on the generated impact labels, emergency warning instructions and general warning instructions are generated for the corresponding monitored objects. The bearing temperature value is the bearing temperature value of the monitored object, and the vibration value is the vibration value of the monitored object. The calculation steps for the voltage influence value uyz include: marking the actual voltage value of the monitored object as u1, and marking the difference between the upper limit and lower limit of the rated voltage of the monitored object as u2. The calculation steps for the current influence value Iyz include: marking the actual current value of the monitored object as I1, and marking the difference between the upper limit and lower limit of the rated current of the monitored object as I2. The steps for generating emergency self-influence labels and general self-influence labels include: labeling the bearing temperature value and vibration value as zwi and zdi respectively, where i represents the number of monitored objects and is an integer greater than 0; performing formulaic analysis on them to obtain the self-influence coefficient ZSxi; Set a threshold for the range of self-influence coefficients. If the self-influence coefficient ZSxi is greater than or equal to the maximum value of the self-influence coefficient range threshold, then generate an emergency self-influence label for the corresponding monitored object. If the self-influence coefficient ZSxi is less than the maximum value of the self-influence coefficient range threshold and greater than the minimum value of the self-influence coefficient range threshold, then a general self-influence label is generated for the corresponding monitored object. If the self-influence coefficient ZSxi is less than or equal to the minimum threshold value of the self-influence coefficient range, then no influence label will be generated for the corresponding monitored object. The steps for generating emergency power supply impact labels and general power supply impact labels include labeling the voltage impact value and the current impact value as uyzi and Iyzi respectively, performing formula analysis on them, and obtaining the power supply impact coefficient Gnxi; Set a threshold range for the energy supply impact coefficient. If the energy supply impact coefficient Gnxi is greater than or equal to the maximum value of the energy supply impact coefficient range threshold, then generate an emergency energy supply impact label for the corresponding monitored object. If the energy supply impact coefficient Gnxi is less than the maximum value of the energy supply impact coefficient range threshold and greater than the minimum value of its own impact coefficient range threshold, then a general energy supply impact label is generated for the corresponding monitored object. If the energy supply impact coefficient Gnxi is less than or equal to the minimum value of the energy supply impact coefficient range threshold, then no impact label will be generated for the corresponding monitored object.

2. The method for controlling the temperature of evaporator fins in a dryer based on a frequency-modulated fan according to claim 1, characterized in that, If both the fin temperature and the drying chamber temperature are less than the upper limit of the preset fin temperature and greater than the lower limit of the preset fin temperature, or if the fin temperature is greater than or equal to the upper limit of the preset fin temperature and the drying chamber temperature is less than the upper limit of the preset fin temperature and greater than the lower limit of the preset fin temperature, then a compressor cut-off command, an internal fan low-speed command, and an external fan neutral-speed command are generated. The compressor circuit control module is a compressor cut-off circuit. The fan control module sets the external circulation fan speed to neutral according to the external fan neutral-speed command. The fan control module sets the internal circulation fan speed to low speed according to the internal fan low-speed command. If the fin temperature and the drying room temperature are both greater than or equal to the preset upper limit of the fin temperature, a compressor cut-off command, an internal fan high-speed command, and an external fan high-speed command are generated. The compressor circuit control module is the compressor cut-off circuit, and the compressor stops running. The fan control module sets the speed of the internal circulation fan and the speed of the external circulation fan to high speed according to the internal fan high-speed command and the external fan high-speed command, respectively. If the fin temperature is greater than or equal to the preset upper limit of the fin temperature and the drying room temperature is less than or equal to the preset lower limit of the fin temperature, or if the fin temperature is less than the preset upper limit of the fin temperature but greater than the preset lower limit of the fin temperature and the drying room temperature is less than or equal to the preset upper limit of the fin temperature, then a compressor start command, an internal fan medium speed command, and an external fan neutral speed command are generated. The compressor circuit control module turns on the compressor circuit, and the compressor runs. The fan control module sets the internal circulation fan speed to medium speed according to the internal fan medium speed command, and sets the external circulation fan speed to neutral speed according to the external fan neutral speed command. If both the fin temperature and the drying chamber temperature are less than or equal to the preset upper limit of the fin temperature, a compressor start command, an internal fan medium speed command, and an external fan neutral speed command are generated. The compressor circuit control module starts the compressor circuit, and the compressor runs. The fan control module sets the internal circulation fan speed to medium speed according to the internal fan medium speed command, and sets the external circulation fan speed to neutral according to the external fan neutral speed command.

3. The method for controlling the temperature of evaporator fins in a dryer based on a frequency-modulated fan according to claim 1, characterized in that, The steps for generating emergency warning instructions and general warning instructions include: If any monitored object has both an emergency self-impact label and an emergency power supply impact label, an emergency warning instruction will be generated for the corresponding monitored object; if any monitored object has both an emergency self-impact label and a general power supply impact label, or an emergency power supply impact label and a general self-impact label, a general warning instruction will be generated for the corresponding monitored object; if any monitored object has both a general self-impact label and a general power supply impact label, no warning instruction will be generated for the corresponding monitored object.

Images