High-temperature operation method of air-cooled variable frequency refrigerator

Abstract

The application discloses a high-temperature operation method of an air-cooled variable-frequency refrigerator, which is performed according to the following steps: a first step is an entering step; a state where an ambient temperature is greater than or equal to T1 DEG C is defined as a high-temperature state; after the refrigerator is powered on, a basic control method is used for operation; when a condition for entering a high-temperature operation mode is met, the high-temperature operation mode is entered; a second step is an exiting step; when a condition for exiting the high-temperature operation mode is met, the high-temperature operation mode is exited, and an electric control device resumes execution of the basic control method of the air-cooled variable-frequency refrigerator. The application can increase compressor operation time and improve refrigerating capacity to pursue satisfaction of refrigerating requirements in a high-temperature state, while avoiding the refrigerator from falling into a continuous operation dilemma described in the background technology, so that energy is wasted and the refrigerating effect is poor. The application specifies a matched T1 value through formula calculation according to different sales target regions, so that the specific operation method of the application is more matched with climate conditions of each target region.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical and refrigeration technology, and in particular to a high-temperature operation control technology for a wind-cooled variable-frequency refrigerator. BACKGROUND

[0002] In normal use, the operating frequency of the compressor of a wind-cooled variable-frequency refrigerator is generally set in an optimized range, which can reduce energy consumption and provide a good experience for users. The normal operating control of the compressor is targeted at ordinary working conditions (normal indoor temperature of a family).

[0003] The wind-cooled variable-frequency refrigerator may also encounter adverse working conditions, i.e., high-temperature working conditions. When the ambient temperature of the refrigerator is high (e.g., higher than 40℃), the temperature difference between the inside and outside of the refrigerator is large. The phenomenon of cold leakage, which is not obvious under normal working conditions, is more obvious at this time, and thus a larger refrigerating capacity is required. Therefore, when the ambient temperature of the refrigerator is high, the refrigerator may be in a continuous operation state (the compressor cannot be stopped) to maintain the temperature inside the refrigerator.

[0004] Continuous operation of the refrigerator (compressor) may cause frequent defrosting. Defrosting may also cause fluctuations in the temperature inside the refrigerator, resulting in slow refrigeration and uneven temperature in the compartments.

[0005] The traditional operating mode of the wind-cooled variable-frequency refrigerator may cause the following vicious cycle when the ambient temperature of the refrigerator is high:

[0006] To maintain the temperature inside the refrigerator, the operating time of the compressor of the refrigerator is increased, the amount of frost is increased, defrosting is more frequent, the temperature inside the refrigerator is more difficult to maintain at the set temperature, the operating time of the compressor of the refrigerator is further increased, the amount of frost is further increased, the temperature inside the refrigerator is more difficult to maintain at the set temperature, and the operating time of the refrigerator is further increased until the compressor cannot be stopped.

[0007] After falling into the above vicious cycle, the energy consumption of the refrigerator is high, and the refrigeration effect is poor. Ultimately, the refrigerator may fall into a dilemma in which the compressor cannot be stopped, but frequent defrosting leads to a higher temperature inside the refrigerator, which is worse than the refrigeration effect of the intermittent operation of the compressor. This dilemma is referred to as a "continuous operation dilemma".

[0008] To solve the problem of the continuous operation dilemma of the refrigerator when the ambient temperature is high and to enable the refrigerator to have a relatively optimal working effect when the ambient temperature is high, the present application is designed. SUMMARY

[0009] The present application aims to provide a high-temperature operation method for a wind-cooled variable-frequency refrigerator, which enables the refrigerator to enter a high-temperature operation mode in a timely manner to match the high ambient temperature and to exit the high-temperature operation mode in a timely manner to avoid falling into the continuous operation dilemma described in the background.

[0010] To achieve the above object, the application provides a high-temperature operation method of a wind-cooled variable-frequency refrigerator, the wind-cooled variable-frequency refrigerator having a defrosting heater, a variable-frequency compressor, a refrigeration door sensor for detecting the opening or closing state of a refrigeration chamber door body, a freezing door sensor for detecting the opening or closing state of a freezing chamber door body, an ambient temperature sensor for detecting the ambient temperature, a refrigeration chamber temperature sensor for detecting the refrigeration chamber temperature, a freezing chamber temperature sensor for detecting the freezing chamber temperature, and an electric control device, the electric control device having a timer, the highest operation frequency of the variable-frequency compressor being MAX; the electric control device being connected to the variable-frequency compressor, the refrigeration door sensor, the freezing door sensor, the ambient temperature sensor, the refrigeration chamber temperature sensor, and the freezing chamber temperature sensor, the electric control device storing a basic control method of the wind-cooled variable-frequency refrigerator, the basic control method including an entering defrosting condition and an exiting defrosting condition, the electric control device controlling the defrosting heater to work to defrost when the entering defrosting condition is met.

[0011] The high-temperature operation method of the wind-cooled variable-frequency refrigerator is performed in the following steps:

[0012] After the refrigerator is powered on, the electric control device first executes the basic control method of the wind-cooled variable-frequency refrigerator;

[0013] The first step is an entering step;

[0014] The state where the ambient temperature is equal to or greater than T1 ℃ is defined as a high-temperature state, and 38 ℃≤T1 ℃≤43 ℃;

[0015] After the refrigerator is powered on, the basic control method is executed, and when the conditions for entering the high-temperature operation mode are met, the high-temperature operation mode is entered;

[0016] The conditions for entering the high-temperature operation mode are that the duration of the high-temperature state reaches M minutes, the set temperature of the freezing chamber is equal to or less than -23 ℃, and the cumulative door opening times of the refrigeration chamber door body and the freezing chamber door body are equal to or less than KMC times in a continuous hour, 3≤KMC≤5, and M minutes≥10 minutes;

[0017] The high-temperature operation mode is that the operation frequency of the variable-frequency compressor is MAX, the defrosting heater is turned on to defrost when the entering defrosting condition is met, and the defrosting heater is turned off to defrost when the exiting defrosting condition is met;

[0018] The second step is an exiting step;

[0019] The following six conditions are collectively referred to as the conditions for exiting the high-temperature operation mode, and when any of the following six conditions is met, it is considered that the conditions for exiting the high-temperature operation mode are met, at which time the high-temperature operation mode is exited, and the electric control device resumes executing the basic control method of the wind-cooled variable-frequency refrigerator;

[0020] Condition 1: the ambient temperature is less than T1 ℃;

[0021] Condition 2: The cumulative door opening times of the refrigeration chamber door and the freezer chamber door in a consecutive hour are greater than KMC times;

[0022] Condition 3: The cumulative door opening time of the refrigeration chamber door and the freezer chamber door in a consecutive hour is greater than KMT minutes, and 3 minutes≤KMT≤5 minutes;

[0023] Condition 4: The defrosting times in the high-temperature operation mode are greater than or equal to CS times; 2≤CS≤4;

[0024] Condition 5: The single defrosting time in the high-temperature operation mode is greater than HST for two consecutive times, and 40 minutes≤HST≤45 minutes;

[0025] Condition 6: The set temperature of the freezer chamber is greater than -23℃.

[0026] For the refrigerator model sold in the region with an average relative humidity less than or equal to 40% in summer, T1=38℃;

[0027] For the refrigerator model sold in the region with an average relative humidity greater than or equal to 80% in summer, T1=43℃;

[0028] For the refrigerator model sold in the region with an average relative humidity of X% in summer, T1℃={38+5×(X-40) / 40}℃ when 40%<X%<80%.

[0029] The present application has the following advantages:

[0030] M minutes≥10 minutes, when temporary reasons cause the temporary ambient temperature to be in a high-temperature state, the high-temperature operation mode does not need to be entered; M minutes≥10 minutes can avoid temporary reasons from causing the high-temperature operation mode to be entered. When the set temperature of the freezer chamber is greater than (higher than) -23℃, it represents that the user has no demand for lower storage temperature, and thus the high-temperature operation mode is not started.

[0031] The high door opening frequency is a sign of high frequency of using the refrigerator by the user. Since more new hot air enters the refrigerator when the door is opened, the hot air is prone to frost when the temperature of the hot air decreases, and thus the high door opening frequency is prone to cause excessive frost. The high door opening frequency is also prone to cause the door to be not tightly closed after being opened once, which also greatly increases the defrosting pressure.

[0032] In summary, when the refrigerator is frequently used, the effect of starting the high-temperature operation mode to refrigerate is not obvious and also increases the energy consumption. In this case (when the user uses the refrigerator at a high frequency), if the high-temperature operation mode is continuously maintained, the defrosting pressure is increased, and the continuous operation dilemma described in the background art is entered.

[0033] The longer the door is opened, as well as the more times the door is opened, will cause more new hot air to enter the refrigerator, resulting in an increased amount of frost. When the door is open, the high-temperature operation mode is obviously not effective in cooling and increases energy consumption, and is prone to the continuous operation dilemma described in the background art.

[0034] Exiting the high-temperature operation mode under condition ⑵ and condition ⑶ can avoid the continuous operation dilemma caused by the number of times the door is opened and the time the door is opened.

[0035] Under an environment of high temperature, the continuous operation dilemma is prone to occur when the number of defrosting is large. At this time, exiting the high-temperature operation mode can help avoid the continuous operation dilemma.

[0036] Under an environment of high temperature, the continuous operation dilemma is prone to occur when the defrosting time is long for two consecutive times. At this time, exiting the high-temperature operation mode can help avoid the continuous operation dilemma.

[0037] When the set temperature of the freezer is greater than (higher than) -23℃, it represents that the user has no demand for a lower storage temperature, and thus the high-temperature operation mode is exited.

[0038] For ordinary technical designers, it is more appropriate and labor-saving to specify T1 as a specific value. The inventor of the present application specifies T1 as a range instead of a fixed value, and calculates the specific value of T1 according to the calculation formula and the climate conditions (average relative humidity in summer) of the target sales area, because of the communication with non-technical personnel (specifically sales personnel and consumers in different regions), considering that the environmental humidity is also different in different regions and use occasions. For refrigerator models sold in regions with high environmental humidity, defrosting is more frequent, and T1 should be specified to be higher so as to enter the high-temperature operation mode later and reduce the possibility of triggering the continuous operation dilemma. Conversely, for refrigerator models sold in regions with relatively low environmental humidity, T1 should be specified to be lower so as to enter the high-temperature operation mode as soon as possible without triggering the continuous operation dilemma.

[0039] The reason why only the average relative humidity in summer is considered instead of the average relative humidity throughout the year is that the high-temperature state occurs more in summer.

[0040] T1℃={38+5×(X-40) / 40}℃, in which "5" represents (43-38); the numerator (X-40) represents the difference between the humidity of the sales area exceeding 40%; and the denominator 40 represents the difference between 80% and 40%. According to this formula, the specific value of T1 is specified, which is simple and convenient, and the high-temperature operation mode is more scientific and reasonable, and is more matched with the local relative humidity in summer.

[0041] In summary, the high-temperature operation method of the air-cooled variable-frequency refrigerator according to the present application can increase the compressor operation time and improve the refrigerating capacity to meet the refrigerating demand in the high-temperature state, while avoiding the continuous operation dilemma described in the background art to waste energy and have poor refrigerating effect, and can conveniently specify the matched T1 value through formula calculation for different target sales regions, so that the present application is more matched with the climate conditions of each target region in solving the basic technical problem. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a control flow diagram of the present application. DETAILED DESCRIPTION

[0043] As Figure 1 shown, the present application provides a high-temperature operation method of an air-cooled variable-frequency refrigerator, the air-cooled variable-frequency refrigerator having a defrosting heater, a defrosting temperature sensor, a variable-frequency compressor, a refrigeration door sensor for detecting the opening or closing state of a refrigeration chamber door body, a freezing door sensor for detecting the opening or closing state of a freezing chamber door body, an ambient temperature sensor for detecting the ambient temperature, a refrigeration chamber temperature sensor for detecting the refrigeration chamber temperature, a freezing chamber temperature sensor for detecting the freezing chamber temperature, and an electric control device, the electric control device having a timer, the highest operation frequency of the variable-frequency compressor being MAX (MAX is determined by the specific model of the variable-frequency compressor; generally 70Hz≤MAX≤74Hz); the electric control device being connected to the variable-frequency compressor, the refrigeration door sensor, the freezing door sensor, the ambient temperature sensor, the refrigeration chamber temperature sensor, and the freezing chamber temperature sensor, the electric control device storing a basic control method of the air-cooled variable-frequency refrigerator, the basic control method including an entering defrosting condition and an exiting defrosting condition, the electric control device controlling the defrosting heater to work to defrost when the entering defrosting condition is met;

[0044] In this embodiment, the entering defrosting condition is that the cumulative operation time of the compressor is greater than or equal to H hours, and the temperature detected by the defrosting temperature sensor is less than a preset value stored in the electric control device before leaving the factory (generally, the preset value is between 9-13℃, which is different according to the specific refrigerator model). That is, if the temperature detected by the defrosting temperature sensor is less than the preset value before leaving the factory after the cumulative operation time of the compressor is greater than or equal to H hours, the electric control device controls the defrosting heater to work to defrost.

[0045] Any brand and model of air-cooled variable frequency refrigerator has a basic control method, and has its entering defrosting condition and exiting defrosting condition, otherwise any air-cooled variable frequency refrigerator cannot effectively run, cannot timely start defrosting, and cannot timely stop defrosting, which is obvious. The basic control method and the entering defrosting condition and the exiting defrosting condition are not the innovation points of the present application, and are conventional techniques in the art, and the basic control method and the defrosting control method are disclosed in many published patents, which will not be described herein. The electric control device can be an integrated circuit, a single-chip microcomputer, or a PLC.

[0046] The following steps are taken:

[0047] After the refrigerator is powered on, the electric control device first executes the basic control method of the air-cooled variable frequency refrigerator;

[0048] The first step is an entering step;

[0049] The state where the ambient temperature is greater than or equal to T1℃ is a high-temperature state, and 38℃≤T1℃≤43℃;

[0050] After the refrigerator is powered on, it runs according to the basic control method, and when the conditions for entering the high-temperature running mode are met, it enters the high-temperature running mode;

[0051] The conditions for entering the high-temperature running mode are: the duration of the high-temperature state reaches M minutes, and the set temperature of the freezer compartment is less than (i.e., lower than) -23℃, and the cumulative door opening times of the refrigerator door and the freezer door in the last one hour are less than or equal to KMC times, 3≤KMC≤5, and M minutes≥10 minutes;

[0052] M minutes≥10 minutes, when temporary reasons cause the temporary ambient temperature to be in the high-temperature state, it does not need to enter the high-temperature running mode; M minutes≥10 minutes can avoid temporary reasons from causing the high-temperature running mode to be entered. When the set temperature of the freezer compartment is greater than (higher than) -23℃, it represents that the user does not have a lower storage temperature requirement, so the high-temperature running mode is not started.

[0053] The high-temperature running mode is: the running frequency of the variable frequency compressor is MAX; when the entering defrosting condition is met, the defrosting heater is turned on to defrost; when the exiting defrosting condition is met, the defrosting heater is turned off;

[0054] The second step is an exiting step;

[0055] The following six conditions are collectively referred to as the conditions for exiting the high-temperature running mode. When any of the following six conditions is met, it is considered that the conditions for exiting the high-temperature running mode are met, at which time the high-temperature running mode is exited, and the electric control device resumes executing the basic control method of the air-cooled variable frequency refrigerator;

[0056] Condition 1: the ambient temperature is less than T1℃;

[0057] Condition 2: the cumulative door opening times of the refrigeration chamber door and the freezer chamber door in a continuous one hour are greater than KMC times;

[0058] The more the door opening times, the higher the frequency of the user using the refrigerator. Since more new hot air enters the refrigerator when the door is opened, frost is more likely to form when the temperature of the hot air decreases. Therefore, more door opening times can easily result in excessive frost. More door opening times can also cause the door to be not tightly closed after being opened, which can greatly increase the defrosting pressure.

[0059] In summary, when the refrigerator is frequently used, the effect of starting the high-temperature operation mode for refrigeration is not obvious and energy consumption is increased. In this case (when the user frequently uses the refrigerator), continuously maintaining the high-temperature operation mode can increase the defrosting pressure and cause the continuous operation dilemma described in the background art.

[0060] Condition 3: the cumulative door opening times of the refrigeration chamber door and the freezer chamber door in a continuous one hour are greater than KMC times, and 3 minutes ≤ KMT ≤ 5 minutes;

[0061] The longer the door opening time, like the more door opening times, both can cause more new hot air to enter the refrigerator, resulting in an increase in the amount of frost. In the state of the refrigerator door being opened, the high-temperature operation mode obviously has no obvious refrigeration effect and increases energy consumption, and is easily trapped in the continuous operation dilemma described in the background art.

[0062] Using Condition 2 and Condition 3 to exit the high-temperature operation mode can avoid the factors of door opening times and door opening times causing the refrigerator to run into the continuous operation dilemma.

[0063] Any brand and model of air-cooled variable frequency refrigerator has a basic control method (i.e., operation method or operation program or control program), and exits the high-temperature operation mode, i.e., runs according to the original control program. The high-temperature operation method of the air-cooled variable frequency refrigerator of the present application is an added operation mode based on the original control program of the air-cooled variable frequency refrigerator, i.e., when the conditions for entering the high-temperature operation mode are met, the original control program is converted to the high-temperature operation mode; when the conditions for exiting the high-temperature operation mode are met, the high-temperature operation mode is exited and the original control program is run.

[0064] Condition 4: the defrosting times in the high-temperature operation mode are greater than or equal to CS times; 2 ≤ CS ≤ 4; defrosting is started and ended by the electric control device, so the electric control device can easily count the defrosting times.

[0065] In an environment with high temperature, when the defrosting times are more, it is easy to enter the continuous operation dilemma, and at this time, exiting the high-temperature operation mode can help to avoid the continuous operation dilemma.

[0066] Condition ⑸: the single defrosting time in the high temperature operation mode is greater than HST for two times in succession, 40 minutes ≤ HST ≤ 45 minutes;

[0067] In the environmental high temperature state, if the defrosting time is long for two times in succession, it is easy to enter the continuous operation dilemma, and thus it is helpful to avoid the continuous operation dilemma by exiting the high temperature operation mode.

[0068] Condition ⑹: the set temperature of the freezing chamber is greater than -23℃.

[0069] When the set temperature of the freezing chamber is greater than (higher than) -23℃, it represents that the user has no need for lower storage temperature, and thus the high temperature operation mode is exited.

[0070] When the power of the refrigerator is off, the refrigerator stops running, and thus the high temperature operation mode is exited.

[0071] For the refrigerator model sold in the area where the average relative humidity in summer is less than or equal to 40%, T1 = 38℃;

[0072] For the refrigerator model sold in the area where the average relative humidity in summer is greater than or equal to 80%, T1 = 43℃;

[0073] For the refrigerator model sold in the area where the average relative humidity in summer is X%, 40% < X% < 80%, T1℃ = {38 + 5×(X-40) / 40}℃;

[0074] For the ordinary technical designer, it is more appropriate and labor-saving to specify T1 as a specific value. The inventor of the present application specifies T1 as a range instead of a fixed value, and calculates the specific T1 value according to the calculation formula and the climate condition (the average relative humidity in summer) of the target sales area, because of the communication with the non-technical personnel (specifically the sales personnel and the consumers in different areas), and the consideration of the different environmental humidity in different areas and use occasions. For the refrigerator model sold in the area where the environmental humidity is high, the defrosting is more frequent, and thus T1 should be specified to be higher, so as to enter the high temperature operation mode later, and reduce the possibility of triggering the continuous operation dilemma. On the contrary, for the refrigerator model sold in the area where the environmental humidity is relatively low, T1 should be specified to be lower, so as to enter the high temperature operation mode as early as possible without triggering the continuous operation dilemma.

[0075] The reason why only the average relative humidity in summer is considered instead of the average relative humidity in the whole year is that the high temperature state occurs more in summer.

[0076] T1℃={38+5×(X-40) / 40}℃, wherein "5" represents (43-38); wherein the numerator (X-40) represents the difference value when the humidity of the sales area exceeds 40%; and wherein the denominator 40 represents the difference value between 80% and 40%. The specific value of T1 is designated according to the formula, which is simple and convenient, and the high-temperature operation mode is more scientific and reasonable, and is more matched with the relative humidity in the local summer.

[0077] The above examples are only used to illustrate but not to limit the technical solutions of the present application. Although the present application is described in detail with reference to the above examples, those skilled in the art should understand that the present application can still be modified or equivalently replaced without departing from the spirit and scope of the present application, and any modification or partial replacement should be covered in the scope of the claims of the present application.

Claims

1. High-temperature operation method of air-cooled inverter refrigerator: The air-cooled inverter refrigerator has a defrosting heater, an inverter compressor, a refrigerator door sensor for detecting the open or closed status of the refrigerator door, a freezer door sensor for detecting the open or closed status of the freezer door, an ambient temperature sensor for detecting the ambient temperature, a refrigerator temperature sensor for detecting the refrigerator temperature, a freezer temperature sensor for detecting the freezer temperature, and an electronic control device. The electronic control device has a timer, and the maximum operating frequency of the inverter compressor is MAX. The electronic control device is connected to the inverter compressor, the refrigerator door sensor, the freezer door sensor, the ambient temperature sensor, the refrigerator temperature sensor, and the freezer temperature sensor. The electronic control device stores the basic control method of the air-cooled inverter refrigerator, which includes defrosting conditions and defrosting exit conditions. When the defrosting conditions are met, the electronic control device controls the defrosting heater to work to defrost. Its features Follow these steps: After the refrigerator is powered on, the electronic control device first executes the basic control method of the air-cooled inverter refrigerator; The first step is the entry step; A state with an ambient temperature ≥ T1℃ is defined as a high-temperature state, where 38℃≤T1℃≤43℃; After the refrigerator is powered on, it operates according to the basic control method. When the conditions for entering the high-temperature operation mode are met, it enters the high-temperature operation mode. The conditions for entering the high-temperature operation mode are: the high-temperature state lasts for M minutes, the set temperature of the freezer compartment is less than or equal to -23°C, and the cumulative number of times the refrigerator compartment door and freezer compartment door are opened is less than or equal to KMC times within one hour, 3≤KMC≤5, and M minutes≥10 minutes. The high-temperature operation mode is as follows: the variable frequency compressor operates at its maximum frequency; when the defrosting conditions are met, the defrosting heater is turned on; when the defrosting conditions are met, the defrosting heater is turned off. The second step is the exit step; The following six conditions are collectively referred to as the conditions for exiting the high-temperature operation mode. When any one of the following six conditions is met, it is considered that the conditions for exiting the high-temperature operation mode have been met. At this time, the high-temperature operation mode is exited, and the electronic control device resumes to execute the basic control method of the air-cooled inverter refrigerator. Condition (1): Ambient temperature is less than T1℃; Condition 2: Within one consecutive hour, the cumulative number of times the refrigerator compartment door and the freezer compartment door are opened is greater than KMC times; Condition ⑶: Within one consecutive hour, the cumulative opening time of the refrigerator compartment door and the freezer compartment door is greater than KMT minutes, where 3 minutes ≤ KMT ≤ 5 minutes; Condition 4: The number of defrost cycles in high-temperature operation mode is greater than or equal to CS times; 2≤CS≤4; Condition 5: The defrosting time in high-temperature operation mode is greater than HST twice consecutively, with 40 minutes ≤ HST ≤ 45 minutes; Condition 6: The freezer compartment temperature is set to be greater than -23℃.

2. The high-temperature operation method of the air-cooled inverter refrigerator according to claim 1, characterized in that: For refrigerator models sold in areas where the average relative humidity in summer is less than or equal to 40%, T1 = 38℃; For refrigerator models sold in areas where the average relative humidity in summer is greater than or equal to 80%, T1 = 43℃; 40% < X% < 80%. For refrigerator models sold in areas with an average relative humidity of X% in summer, T1℃ = {38 + 5 × (X - 40) / 40}℃.

Images