Refrigeration equipment and control method thereof
By calculating the temperature difference between the return air temperature and the outlet air temperature, and combining this with the fan current and humidity, it is possible to determine whether the evaporator surface is covered with debris. This solves the problem of misjudgment, achieves precise cleaning and defrosting control, and improves the operating efficiency of refrigeration equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD
- Filing Date
- 2026-03-10
- Publication Date
- 2026-05-19
AI Technical Summary
In the existing technology, it is easy to misjudge whether the evaporator surface is covered with frost, foam debris, fibers and other impurities based on the difference between the return air temperature and the outlet air temperature and the set value, which affects the cooling effect of the refrigeration equipment.
By obtaining the first temperature difference between the indoor unit's return air temperature and the actual outlet air temperature, and the second temperature difference between the return air temperature and the theoretical outlet air temperature, the difference or ratio of the temperature difference is calculated. Combined with the fan current and humidity, it is determined whether the evaporator surface is covered with debris, and then the cleaning mode is entered or a reminder is issued.
It enables more accurate judgment of whether the evaporator surface is covered with debris, allowing for timely cleaning or reminders to users, avoiding misjudgments and frequent defrosting, and improving the operating efficiency of refrigeration equipment.
Smart Images
Figure CN122058718A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of refrigeration technology, specifically providing a refrigeration device and its control method. Background Technology
[0002] The refrigerated compartment of the refrigerated truck is equipped with refrigeration equipment, which includes an indoor unit and an outdoor unit. The indoor unit is installed inside the refrigerated compartment, and the outdoor unit is installed outside the refrigerated compartment. The indoor unit has air outlets and air inlets, and contains an evaporator and an internal fan, which are located in the air duct between the air outlets and air inlets.
[0003] During daily use, water vapor in the air easily condenses into frost on the surface of the evaporator. Foam debris and fibers from packaging also enter the air duct through the return air inlet and adhere to the evaporator surface. All of these factors affect the heat exchange of the evaporator, thus impacting the cooling effect of the refrigeration equipment. To determine whether the evaporator surface is covered with frost, foam debris, fibers, or other debris, the return air temperature and outlet air temperature of the indoor unit are measured during refrigeration equipment operation. The difference between the return air temperature and the outlet air temperature is calculated. When the difference is less than the set value, the evaporator is considered to be frosted. However, as the refrigeration equipment operates, the temperature inside the refrigerator compartment gradually decreases, and the difference between the return air temperature and the outlet air temperature also decreases. This can lead to a situation where, even when the evaporator surface is not covered with frost, foam debris, fibers, or other debris, the difference between the return air temperature and the outlet air temperature is less than the set value, resulting in a misjudgment that the evaporator surface is covered with frost, foam debris, fibers, or other debris.
[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention
[0005] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that it is easy to misjudge whether the evaporator surface is covered with debris based on the difference between the return air temperature and the outlet air temperature and the set value.
[0006] In a first aspect, the present invention provides a control method for a refrigeration device, the refrigeration device including an indoor unit and an outdoor unit, the control method comprising: acquiring a first temperature difference between the return air temperature and the actual outlet air temperature of the indoor unit; acquiring a second temperature difference between the return air temperature and the theoretical outlet air temperature of the indoor unit; determining, based on the first temperature difference and the second temperature difference, whether the surface of the evaporator of the indoor unit is covered with debris; if the surface of the evaporator of the indoor unit is covered with debris, then entering a cleaning mode and / or issuing a reminder.
[0007] In the preferred embodiment of the above control method, the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: calculating the difference between the second temperature difference and the first temperature difference; and determining whether the surface of the evaporator of the indoor unit is covered with debris based on the difference.
[0008] In the preferred embodiment of the above control method, the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: calculating the ratio of the first temperature difference to the second temperature difference; and determining whether the surface of the evaporator of the indoor unit is covered with debris based on the ratio.
[0009] In the preferred embodiment of the above control method, the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris according to the ratio" specifically includes: if the ratio is less than a first threshold, then it is determined that the surface of the evaporator of the indoor unit is covered with debris.
[0010] In the preferred embodiment of the above control method, the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris according to the ratio" specifically includes: if the ratio is not less than the first threshold and not greater than the second threshold, it is determined that the surface of the evaporator of the indoor unit is not covered with debris; if the ratio is greater than the second threshold, it is determined that the temperature sensor of the indoor unit is abnormal; wherein, the second threshold is greater than the first threshold.
[0011] In a preferred embodiment of the above control method, the control method further includes: acquiring the current of the fan of the indoor unit and the humidity of the space where the indoor unit is located; the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference, the second temperature difference, the current and the humidity.
[0012] In the preferred embodiment of the above control method, the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference, the second temperature difference, the current, and the humidity" specifically includes: calculating the ratio of the first temperature difference to the second temperature difference; if the ratio is less than a first threshold, the humidity is greater than a first set humidity, the current is greater than a first preset current and less than a second preset current, then it is determined that the surface of the evaporator of the indoor unit is covered with frost; and / or if the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is not less than the second preset current, then it is determined that the surface of the evaporator of the indoor unit is dirty; wherein, the first set humidity is greater than the second set humidity, and the first preset current is less than the second preset current.
[0013] In the preferred embodiment of the above control method, the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference, the second temperature difference, the current and the humidity" further includes: if the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is greater than the first preset current and less than the second preset current, then the temperature sensor of the indoor unit is determined to be abnormal.
[0014] In the preferred embodiment of the above control method, the step of "entering cleaning mode and / or issuing a reminder if the surface of the evaporator of the indoor unit is covered with debris" specifically includes: when it is determined that the surface of the evaporator of the indoor unit is covered with frost, comparing the ratio with the size of a third threshold; if the ratio is greater than the third threshold, entering dynamic defrosting mode; if the ratio is not greater than the third threshold, entering immediate defrosting mode; wherein, the third threshold is less than the first threshold.
[0015] When the above technical solution is adopted, the refrigeration equipment includes an indoor unit and an outdoor unit, and the control method of the refrigeration equipment includes: obtaining a first temperature difference between the return air temperature of the indoor unit and the actual outlet air temperature; obtaining a second temperature difference between the return air temperature of the indoor unit and the theoretical outlet air temperature; determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference; if the surface of the evaporator of the indoor unit is covered with debris, then entering the cleaning mode and / or issuing a reminder.
[0016] Under normal cooling conditions, when the evaporator surface of the indoor unit of the refrigeration equipment is not covered by debris, the difference between the return air temperature and the actual outlet air temperature will not differ significantly from the difference between the return air temperature and the theoretical outlet air temperature. During the operation of the refrigeration equipment, the first temperature difference between the return air temperature and the actual outlet air temperature, and the second temperature difference between the return air temperature and the theoretical outlet air temperature are obtained. Based on the first and second temperature differences, it is determined whether the surface of the evaporator of the indoor unit is covered by debris. If the surface of the evaporator of the indoor unit is covered by debris, the cleaning mode is activated and / or an alert is issued. This allows for a more accurate determination of whether the surface of the evaporator of the indoor unit of the refrigeration equipment is covered by debris, so as to automatically clean the debris in a timely and accurate manner or remind the user to clean the debris in a timely manner.
[0017] Specifically, the step of "determining whether the surface of the indoor unit's evaporator is covered with debris based on the first and second temperature differences" includes: calculating the difference between the second and first temperature differences; and determining whether the surface of the indoor unit's evaporator is covered with debris based on the difference. Specifically, if the difference is greater than a preset value, it is determined that the surface of the indoor unit's evaporator is covered with debris; if the difference is less than 0, it is determined that the indoor unit's temperature sensor is malfunctioning; if the difference is not less than 0 and not greater than the preset value, it is determined that the surface of the indoor unit's evaporator is not covered with debris. The preset value is greater than 0 and can be 2℃, 3℃, or other suitable values, which can be set according to the actual application.
[0018] Preferably, the step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: calculating the ratio of the first temperature difference to the second temperature difference; and determining whether the surface of the evaporator of the indoor unit is covered with debris based on the ratio. Specifically, if the ratio is less than a first threshold, it is determined that the surface of the evaporator of the indoor unit is covered with debris; if the ratio is not less than the first threshold and not greater than the second threshold, it is determined that the surface of the evaporator of the indoor unit is not covered with debris; if the ratio is greater than the second threshold, it is determined that the temperature sensor of the indoor unit is malfunctioning; wherein, the second threshold is greater than the first threshold.
[0019] At different cooling capacities, the amount of cooling capacity lost varies, and the difference between the first and second temperature differences will also differ. However, the proportion of effective cooling capacity does not change significantly, so the ratio of the second temperature difference to the first temperature difference does not change much. By calculating the ratio of the first temperature difference to the second temperature difference, and using this ratio to determine whether the surface of the indoor unit's evaporator is covered with debris, the accuracy of determining whether the evaporator surface is covered with debris can be further improved.
[0020] Preferably, the control method further includes: acquiring the current of the indoor unit's fan and the humidity of the space where the indoor unit is located; the step of "determining whether the surface of the indoor unit's evaporator is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: determining whether the surface of the indoor unit's evaporator is covered with debris based on the first temperature difference, the second temperature difference, the current, and the humidity. Specifically, the ratio of the first temperature difference to the second temperature difference is calculated; if the ratio is less than a first threshold, the humidity is greater than a first set humidity, and the current is greater than a first preset current and less than a second preset current, then it is determined that the surface of the indoor unit's evaporator is covered with frost; if the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is not less than the second preset current, then it is determined that the surface of the indoor unit's evaporator is dirty; if the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is greater than the first preset current and less than the second preset current, then it is determined that the indoor unit's temperature sensor is abnormal; wherein, the first set humidity is greater than the second set humidity, and the first preset current is less than the second preset current.
[0021] With this setting, it is possible to more accurately determine whether the surface of the indoor unit's evaporator is covered with debris, and also to determine whether the evaporator surface is frosted or covered with other debris. Based on the specific judgment, it can then perform corresponding cleaning procedures or provide more accurate reminders.
[0022] Preferably, the step of "entering cleaning mode and / or issuing a reminder if the surface of the evaporator of the indoor unit is covered with debris" specifically includes: when it is determined that the surface of the evaporator of the indoor unit is covered with frost, comparing the ratio with the size of a third threshold; if the ratio is greater than the third threshold, entering dynamic defrosting mode; if the ratio is not greater than the third threshold, entering immediate defrosting mode; wherein, the third threshold is less than the first threshold.
[0023] With this setting, the corresponding defrosting mode can be executed according to the severity of frost buildup, which satisfies the defrosting needs while avoiding frequent defrosting from affecting cooling.
[0024] In a second aspect, the present invention also provides a refrigeration device, the refrigeration device comprising: a memory; a processor; and a computer program, the computer program being stored in the memory and configured to be executed by the processor to implement the control method of the refrigeration device as described in any of the above technical solutions.
[0025] It should be noted that the refrigeration equipment has all the technical effects of the control method of the refrigeration equipment described in any of the above technical solutions, and will not be repeated here. Attached Figure Description
[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 This is a diagram showing the main steps of the control method for the refrigeration equipment of the present invention; Figure 2 This is a diagram showing the main steps of the control method for a refrigeration device according to the first embodiment of the present invention; Figure 3 This is a diagram showing the main steps of the control method for a refrigeration device according to the second embodiment of the present invention; Figure 4 This is a diagram showing the main steps of the control method for a refrigeration device according to the third embodiment of the present invention. Detailed Implementation
[0027] First, those skilled in the art should understand that the embodiments described below are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.
[0028] It should be noted that in the description of the invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0030] To address the issue mentioned in the background art where relying on the difference between the return air temperature and the outlet air temperature relative to a set value can easily lead to misjudgment of whether the evaporator surface is covered with debris, this invention provides a control method for a refrigeration device. The refrigeration device includes an indoor unit and an outdoor unit. For example... Figure 1 As shown, the control method of the present invention includes the following steps: S100: Obtain the first temperature difference between the return air temperature and the actual outlet air temperature of the indoor unit.
[0031] S200: Obtain the second temperature difference between the return air temperature and the theoretical outlet air temperature of the indoor unit.
[0032] S300: Determine whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference.
[0033] S400: If the surface of the evaporator of the indoor unit is covered with debris, the cleaning mode will be activated and / or a reminder will be issued.
[0034] Specifically, the indoor unit of the refrigeration equipment includes a casing and return air inlets and outlet air outlets installed on the casing. An air duct connecting the return air inlets and outlet air outlets is installed inside the casing, and an evaporator and an indoor fan are installed within the air duct. A temperature sensor for detecting the return air temperature is installed at the return air inlet, and a temperature sensor for detecting the outlet air temperature is installed at the outlet air outlet. When the refrigeration equipment is in use, the return air temperature is detected by the temperature sensor at the return air inlet, and the actual outlet air temperature is detected by the temperature sensor at the outlet air outlet. The first temperature difference between the return air temperature and the actual outlet air temperature is calculated, which is the return air temperature minus the actual outlet air temperature. Simultaneously, the airflow rate at the outlet air outlet and the cooling capacity of the refrigeration equipment are acquired over a short period of time. For example, the airflow rate is detected by an airflow detection device at the outlet air outlet, and the cooling capacity is estimated based on the ratio of the compressor's current operating frequency to its rated frequency and the rated cooling capacity. Then, the second temperature difference is calculated: Second temperature difference = (Cooling capacity / (Air specific heat capacity * Air density * Outlet airflow)). Then, based on the first and second temperature differences, it is determined whether the surface of the evaporator of the indoor unit is covered with debris. If the surface of the evaporator of the indoor unit is covered with debris, the cleaning mode is entered. For example, the defrosting operation is performed first, and then the indoor fan rotates in reverse to blow out foam debris, fibers and other debris attached to the evaporator by reverse air blowing operation that allows air to enter through the air outlet and exit through the air return outlet. It can also issue a reminder to prompt the user to manually clean the unit, and can also indicate that a cleaning operation is in progress while the cleaning operation is being performed.
[0035] Under normal cooling conditions, when the surface of the evaporator of the indoor unit of the refrigeration equipment is not covered by debris, the difference between the return air temperature and the actual outlet air temperature will not differ significantly from the difference between the return air temperature and the theoretical outlet air temperature. The control method described above allows for more accurate determination of whether the surface of the evaporator of the indoor unit of the refrigeration equipment is covered by debris, enabling timely and accurate automatic cleaning of the debris or prompting the user to clean it promptly.
[0036] It should be noted that the execution order of steps S100 and S200 is not important; they can be executed simultaneously or sequentially, as long as they are performed before step S300.
[0037] In a first embodiment of the present invention, as Figure 2 As shown, the control method of the refrigeration equipment of the present invention includes the following steps: S100: Obtain the first temperature difference between the return air temperature and the actual outlet air temperature of the indoor unit.
[0038] S200: Obtain the second temperature difference between the return air temperature and the theoretical outlet air temperature of the indoor unit.
[0039] S311. Calculate the difference between the second temperature difference and the first temperature difference.
[0040] In other words, the second temperature difference minus the first temperature difference.
[0041] S312. Determine whether the surface of the evaporator of the indoor unit is covered with debris based on the difference.
[0042] S400: If the surface of the evaporator of the indoor unit is covered with debris, the cleaning mode will be activated and / or a reminder will be issued.
[0043] Step S312 may specifically include: if the difference is greater than a preset value, it is determined that the surface of the evaporator of the indoor unit is covered with debris; if the difference is less than 0, it is determined that the temperature sensor of the indoor unit is abnormal; if the difference is not less than 0 and not greater than the preset value, it is determined that the surface of the evaporator of the indoor unit is not covered with debris; wherein, the preset value is greater than 0, and the preset value can be 2℃, 3℃ or other suitable values, etc.
[0044] In a second embodiment of the invention, such as Figure 2 As shown, the control method of the refrigeration equipment of the present invention includes the following steps: S100: Obtain the first temperature difference between the return air temperature and the actual outlet air temperature of the indoor unit.
[0045] S200: Obtain the second temperature difference between the return air temperature and the theoretical outlet air temperature of the indoor unit.
[0046] S321. Calculate the ratio of the first temperature difference to the second temperature difference.
[0047] In other words, the first temperature divided by the second temperature difference.
[0048] S322. Determine whether the surface of the evaporator of the indoor unit is covered with debris based on the ratio.
[0049] S400: If the surface of the evaporator of the indoor unit is covered with debris, the cleaning mode will be activated and / or a reminder will be issued.
[0050] Step S322 may specifically include: if the ratio is less than a first threshold, then it is determined that the surface of the evaporator of the indoor unit is covered with debris; if the ratio is not less than the first threshold and not greater than a second threshold, then it is determined that the surface of the evaporator of the indoor unit is not covered with debris; if the ratio is greater than the second threshold, then it is determined that the temperature sensor of the indoor unit is malfunctioning; wherein, the second threshold is greater than the first threshold. The first threshold can be any value between 0.75 and 0.85, preferably 0.8, and the second threshold can be any value between 1.15 and 1.25, preferably 1.2.
[0051] At different cooling capacities, the amount of cooling capacity lost varies, and the difference between the first and second temperature differences will also differ. However, the proportion of effective cooling capacity does not change significantly, so the ratio of the second temperature difference to the first temperature difference does not change much. By using the ratio of the first temperature difference to the second temperature difference to determine whether the surface of the indoor unit's evaporator is covered with debris, the accuracy of this judgment can be further improved.
[0052] In the first and second embodiments described above, although it is possible to determine relatively accurately whether the evaporator surface of the indoor unit of the refrigeration equipment is covered with foreign objects, it is not possible to determine relatively accurately whether the evaporator surface is covered with frost or foam debris, fibers or other debris, which makes it inconvenient to perform the corresponding cleaning operation accurately.
[0053] In a third embodiment of the invention, such as Figure 4 As shown, the control method of the refrigeration equipment of the present invention includes the following steps: S100: Obtain the first temperature difference between the return air temperature and the actual outlet air temperature of the indoor unit.
[0054] S200: Obtain the second temperature difference between the return air temperature and the theoretical outlet air temperature of the indoor unit.
[0055] S500: Obtains the current of the indoor unit's fan and the humidity of the space where the indoor unit is located.
[0056] S330: Determine whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference, the second temperature difference, the current, and the humidity.
[0057] S400: If the surface of the evaporator of the indoor unit is covered with debris, the cleaning mode will be activated and / or a reminder will be issued.
[0058] Step S330 may specifically include: Calculate the ratio of the first temperature difference to the second temperature difference; If the ratio is less than the first threshold, the humidity is greater than the first set humidity, and the current is greater than the first preset current and less than the second preset current, then it is determined that the surface of the evaporator of the indoor unit is covered with frost. If the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is not less than the second preset current, then it is determined that the surface of the evaporator of the indoor unit is dirty (i.e., the surface of the evaporator is covered with foam debris, fibers and other impurities). If the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is greater than the first preset current and less than the second preset current, then the temperature sensor of the indoor unit is determined to be abnormal. If the ratio is not less than the first threshold and not greater than the second threshold, it is determined that the surface of the evaporator of the indoor unit is not covered with debris. If the ratio is greater than the second threshold, the temperature sensor of the indoor unit is determined to be abnormal.
[0059] Wherein, the second threshold is greater than the first threshold, the first threshold can be any value between 0.75 and 0.85, preferably 0.8, and the second threshold can be any value between 1.15 and 1.25, preferably 1.2; the first set humidity is greater than the second set humidity, the first preset current is less than the second preset current, the first set humidity and the second set humidity can be 85% and 50% respectively, and the first preset current and the second preset current can be 90% and 110% of the rated current respectively.
[0060] Step S400 may include: if it is determined that the surface of the evaporator of the indoor unit is covered with frost, then entering the defrosting mode; if it is determined that the surface of the evaporator of the indoor unit is dirty, then entering the reverse air blowing cleaning mode; if it is determined that the temperature sensor of the indoor unit is abnormal, then issuing a reminder to the user that the temperature sensor is abnormal.
[0061] With this setting, it is possible to more accurately determine whether the surface of the indoor unit's evaporator is covered with debris, and also to determine whether the evaporator surface is frosted or covered with other debris. Based on the specific judgment, it can then perform corresponding cleaning procedures or provide more accurate reminders.
[0062] It should be noted that the execution of steps S100, S200 and S500 is not in any particular order; they can be executed simultaneously or sequentially, as long as they are performed before step S330.
[0063] Preferably, step S400 includes: when it is determined that the surface of the evaporator of the indoor unit is covered with frost, comparing the ratio with the size of a third threshold; if the ratio is greater than the third threshold, then entering the dynamic defrosting mode; if the ratio is not greater than the third threshold, then entering the immediate defrosting mode; wherein, the third threshold is less than the first threshold.
[0064] The defrosting cycle in dynamic defrosting mode is calculated as follows: T = T = T 基准×(1-k(1-R) / 0.4;where k is an empirical correction coefficient, which can be 0.4, 0.5, 0.6, etc., and R is the ratio of the first temperature difference to the second temperature difference.
[0065] With this setting, the corresponding defrosting mode can be executed according to the severity of frost buildup, which satisfies the defrosting needs while avoiding frequent defrosting from affecting cooling.
[0066] Preferably, the control method of the present invention further includes: within a set time period (e.g., within 3 minutes or 5 minutes) after the defrosting operation is performed, detecting the water flow rate of the drain outlet of the indoor unit's water tray; if the water flow rate is greater than the preset flow rate (e.g., 0.5L / min), then defrosting is determined to be successful; if no water flows out of the drain outlet of the indoor unit's water tray, further calculating the ratio of the current first temperature difference to the second temperature difference; if the ratio is not less than the first threshold and not greater than the second threshold, then drainage is determined to be abnormal, and a drainage abnormality reminder is issued.
[0067] Preferably, a PTC self-regulating heating belt is wound around the drain pipe of the indoor unit's water receiving pan. The control method for the refrigeration equipment of the present invention further includes: controlling the PTC self-regulating heating belt to operate when the refrigeration equipment performs a defrosting operation; and controlling the PTC self-regulating heating belt to stop operating after the defrosting operation is completed and extending the operation for a set time.
[0068] In addition, the present invention also provides a refrigeration device, the refrigeration device comprising: a memory; a processor; and a computer program, the computer program being stored in the memory and configured to be executed by the processor to implement the control method of the refrigeration device as described in any of the above embodiments.
[0069] It should be noted that this refrigeration equipment can be used in refrigerated trucks, freezers, etc.
[0070] Preferably, the water tray of the indoor unit is higher in the middle and lower on both sides along its length, and along its width, the water tray slopes downwards from one side to the other, with the drain outlet located at the lowest point on both sides of the water tray. This design allows for smoother drainage from the water tray.
[0071] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.
Claims
1. A control method for a refrigeration device, the refrigeration device comprising an indoor unit and an outdoor unit, characterized in that, The control method includes: Obtain the first temperature difference between the return air temperature and the actual outlet air temperature of the indoor unit; Obtain the second temperature difference between the return air temperature and the theoretical outlet air temperature of the indoor unit; Determine whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference; If the surface of the evaporator of the indoor unit is covered with debris, a cleaning mode will be activated and / or an alert will be issued.
2. The control method according to claim 1, characterized in that, The step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: Calculate the difference between the second temperature difference and the first temperature difference; The difference is used to determine whether the surface of the evaporator of the indoor unit is covered with debris.
3. The control method according to claim 1, characterized in that, The step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: Calculate the ratio of the first temperature difference to the second temperature difference; The ratio is used to determine whether the surface of the evaporator of the indoor unit is covered with debris.
4. The control method according to claim 3, characterized in that, The step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the ratio" specifically includes: If the ratio is less than the first threshold, it is determined that the surface of the evaporator of the indoor unit is covered with debris.
5. The control method according to claim 4, characterized in that, The step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the ratio" specifically includes: If the ratio is not less than the first threshold and not greater than the second threshold, it is determined that the surface of the evaporator of the indoor unit is not covered with debris. If the ratio is greater than the second threshold, it is determined that the temperature sensor of the indoor unit is malfunctioning; Wherein, the second threshold is greater than the first threshold.
6. The control method according to claim 1, characterized in that, The control method further includes: The current of the indoor unit's fan and the humidity of the space where the indoor unit is located are obtained; The step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference and the second temperature difference" specifically includes: The surface of the evaporator of the indoor unit is determined to be covered with debris based on the first temperature difference, the second temperature difference, the current, and the humidity.
7. The control method according to claim 6, characterized in that, The step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference, the second temperature difference, the current, and the humidity" specifically includes: Calculate the ratio of the first temperature difference to the second temperature difference; If the ratio is less than a first threshold, the humidity is greater than a first set humidity, and the current is greater than a first preset current and less than a second preset current, then it is determined that the surface of the evaporator of the indoor unit is covered with a layer of frost; and / or If the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is not less than the second preset current, then it is determined that the surface of the evaporator of the indoor unit is dirty. Wherein, the first set humidity is greater than the second set humidity, and the first preset current is less than the second preset current.
8. The control method according to claim 7, characterized in that, The step of "determining whether the surface of the evaporator of the indoor unit is covered with debris based on the first temperature difference, the second temperature difference, the current, and the humidity" further includes: If the ratio is less than the first threshold, the humidity is less than the second set humidity, and the current is greater than the first preset current and less than the second preset current, then the temperature sensor of the indoor unit is determined to be abnormal.
9. The control method according to claim 7 or 8, characterized in that, The steps of "entering cleaning mode and / or issuing a reminder if the surface of the evaporator of the indoor unit is covered with debris" specifically include: When it is determined that the surface of the evaporator of the indoor unit is covered with frost, the ratio is compared with the value of the third threshold. If the ratio is greater than the third threshold, then enter dynamic defrosting mode; If the ratio is not greater than the third threshold, then enter the immediate defrost mode; The third threshold is less than the first threshold.
10. A refrigeration device, characterized in that, The refrigeration equipment includes: Memory; Processor; and A computer program, stored in the memory and configured to be executed by the processor to implement the control method of the refrigeration device according to any one of claims 1 to 9.