A drive board heat dissipation system, a refrigeration device and a control method thereof

Abstract

The application discloses a kind of drive plate heat dissipation system, refrigeration equipment and its control method, the system includes: drive plate, its outside is provided with radiator;Drive plate heat dissipation pipeline is set on drive plate, and refrigerant is cooled to drive plate by drive plate heat dissipation pipeline;Bypass pipeline is connected in parallel at the both ends of drive plate heat dissipation pipeline, and bypass solenoid valve is arranged on it;Air-cooled heat dissipation component includes: flow guide air duct, regulating damper and condenser fan, the inlet of flow guide air duct is towards the air outlet direction of condenser fan, and the outlet is opposite radiator, and regulating damper is arranged between condenser fan and radiator;Air current generated when condenser fan operates, drive plate is cooled by flow guide air duct and regulating damper.The application effectively prevents the condensation situation when drive plate defrosting, and through waste heat recovery when refrigeration, improve the energy utilization efficiency of overall system, reduce operating cost, realize the unity of energy saving, stability and intelligent control.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, specifically to a driver board heat dissipation system, refrigeration equipment and its control method. Background Technology

[0002] With the rapid development of cold chain logistics, the performance requirements for refrigeration equipment in low-temperature cold storage are increasing, particularly regarding operational reliability and energy efficiency. Currently, the use of hot-flecked defrosting technology to remove frost from evaporator surfaces in cold storage refrigeration units is a mature technology, and upgrades are gradually moving from fixed-frequency units to variable-frequency units to achieve more precise temperature control and better energy efficiency. However, the application of variable-frequency hot-flecked defrosting technology in low-temperature cold storage environments presents the following technical challenges: Risk of refrigerant cooling failure: During the hot defrosting stage, the system enters a high-temperature, high-pressure operating state, but the ambient temperature inside the storage room remains extremely low. At this time, the temperature of some of the refrigerant after being throttled by the electronic expansion valve can drop below 0°C. If the drive board uses direct refrigerant cooling, the low-temperature refrigerant will continuously flow through the heat dissipation substrate, causing severe condensation or even icing on the surface of the drive board and its internal components. The accumulation of frost not only affects electrical insulation performance but may also lead to short circuits on the circuit board, freezing and cracking of components, and ultimately cause the drive board to burn out and fail completely.

[0003] Insufficient air cooling: For high-power refrigeration units, the heat density of the drive board, especially the IPM module, is extremely high during high-frequency cooling operation. If relying solely on air cooling, although the low ambient temperature is conducive to heat dissipation in low-temperature environments, the heat exchange efficiency between the drive board and the fan is limited by the low thermal conductivity of air. Furthermore, the air ducts in the cold storage are constrained by space layout, resulting in a complex design that makes it difficult to dissipate high heat in a short time. Therefore, the drive board is prone to localized overheating and damage.

[0004] Limitations of a Single Heat Dissipation Mode: In existing technologies, refrigerant cooling and air cooling for the drive board often exist independently or have unclear switching logic. The main problem is that the drive board generates a large amount of heat during cooling operation, requiring efficient phase change heat transfer of the refrigerant. However, during defrosting operation, the drive board generates less heat, and refrigerant cooling can lead to condensation due to the low temperature of the medium. The heat dissipation requirements for these two operating conditions are completely opposite, and existing single or simple parallel heat dissipation architectures cannot meet both needs. There is a lack of a composite heat dissipation solution that can intelligently switch the heat dissipation medium according to the system's operating conditions, efficiently removing heat during cooling while avoiding the risk of condensation and freezing caused by excessive refrigerant cooling during defrosting.

[0005] Therefore, in order to solve the technical problems of condensation, ice formation and burnout on the surface of the drive board due to excessively low refrigerant temperature during hot defrosting in refrigeration equipment, and the problem that a single heat dissipation mode cannot meet the universality of the thermal management needs of the drive board under different operating conditions, a dual-mode drive board heat dissipation system is urgently needed. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a driver board heat dissipation system, a cooling device, and a control method thereof.

[0007] The present invention adopts the following technical solution.

[0008] A first aspect of the present invention provides a driver board heat dissipation system, comprising: A driver board, wherein a heat sink is provided on the outside of the driver board; A heat dissipation pipe is provided on the drive board, and the refrigerant dissipates heat from the drive board through the heat dissipation pipe. A bypass pipe is connected in parallel to both ends of the heat dissipation pipe of the drive board, and a bypass solenoid valve is provided on it. The air-cooled heat dissipation assembly includes: a guide air duct, a regulating damper, and a condenser fan. The inlet of the guide air duct faces the air outlet direction of the condenser fan, and the outlet faces the drive plate radiator. The regulating damper is located between the condenser fan and the radiator. The airflow generated by the condenser fan during operation cools the radiator through the guide air duct and the regulating damper, thereby dissipating heat from the drive plate.

[0009] A second aspect of the present invention provides a refrigeration device, including a drive plate heat dissipation system as described in the first aspect, and further including: a compressor, a four-way valve, a condenser, an electronic expansion valve, an evaporator, and a gas-liquid separator, wherein the above components are sequentially connected through refrigerant pipelines to form a closed refrigerant circulation loop, and a main solenoid valve is disposed on the refrigerant circulation loop.

[0010] Preferably, the heat dissipation pipe of the drive plate is connected between the outlet of the condenser and the inlet of the electronic expansion valve.

[0011] Preferably, the refrigeration device further includes a sensor assembly, the sensor assembly comprising: The first temperature sensor, used to detect the defrosting temperature Te of the evaporator, is installed at the elbow of the evaporator; The second temperature sensor, used to detect the temperature of the storage room, is installed at the return air position of the evaporator; The third temperature sensor, used to monitor the temperature Td of the driver board, is installed on the surface of the driver board.

[0012] Preferably, in the refrigeration mode, the main solenoid valve is opened, the regulating damper and the bypass solenoid valve are closed, and the refrigerant flows through the compressor, four-way valve, condenser, main solenoid valve, drive plate heat dissipation pipes, electronic expansion valve, evaporator and gas-liquid separator, and then returns to the compressor.

[0013] Preferably, during the refrigeration process, after the refrigerant flows out of the compressor, it flows through the main solenoid valve and then through the heat dissipation pipe of the drive board, thereby absorbing heat and subcooling the drive board, and achieving heat dissipation of the refrigerant on the drive board.

[0014] Preferably, in defrost mode, the four-way valve reverses, controlling the main solenoid valve to close, while the bypass solenoid valve and regulating damper open. The refrigerant flows through the compressor, four-way valve, evaporator, electronic expansion valve, bypass solenoid valve, condenser, gas-liquid separator, and finally back to the compressor.

[0015] Preferably, during the defrosting process, the bypass solenoid valve is opened, and the refrigerant passes through the bypass solenoid valve without flowing through the heat dissipation pipe of the drive plate. At this time, the regulating damper is opened, and the airflow of the condenser fan passes through the radiator (10) to perform air cooling heat dissipation on the drive plate.

[0016] A third aspect of the present invention provides a control method comprising the following steps: Step 1: When the refrigeration equipment is running in refrigeration mode, the defrosting temperature Te, duration t, continuous refrigeration operation time t2 of the compressor, and defrosting interval time t4 of the evaporator are detected and obtained. The refrigeration equipment enters defrosting mode if and only if the defrosting temperature Te, duration t, continuous refrigeration operation time t2 of the compressor, and defrosting interval time t4 meet the first judgment condition. Step 2: After entering defrosting mode, control the four-way valve to switch directions, close the main solenoid valve, open the bypass solenoid valve and the regulating damper, and use the airflow of the condenser fan to perform air cooling heat dissipation on the drive board through the regulating damper. Step 3: During defrosting mode, detect and obtain the drive board temperature Td, and determine whether the drive board temperature Td is greater than the drive board temperature threshold T3. If so, adjust the condenser fan speed; otherwise, proceed to step 4. Step 4: Detect and obtain the evaporator defrosting temperature Te and defrosting operation time t6. When either the evaporator defrosting temperature Te or the defrosting operation time t6 meets any of the second judgment conditions, determine that the refrigeration equipment exits the defrosting mode and resumes the refrigeration mode. Then, control the four-way valve to reset, the main solenoid valve to open, and the bypass solenoid valve and the regulating damper to close.

[0017] Preferably, the first determination condition is: (1) The evaporator defrosting temperature Te is lower than the preset defrosting start-up temperature threshold T1, i.e. Te <T1; (2) After condition (1) is met, the duration t of this state reaches the preset confirmation time threshold t1, that is, t ≥ t1; (3) After condition (2) is met, the continuous cooling operation time t2 of the compressor has reached the preset minimum operating time threshold t3, that is, t2 ≥ t3; (4) After satisfying condition (3), the time interval t4 from the end of the last defrosting is greater than the preset minimum defrosting interval threshold t5, that is, t4 ≥ t5; The preset defrosting start temperature threshold T1, preset confirmation time threshold t1, preset minimum running time threshold t3, and preset minimum defrosting interval threshold t5 are all preset by the system or set by the user.

[0018] Preferably, the second determination condition is: (1) The defrosting temperature Te of the evaporator rises to above the preset defrosting exit temperature threshold T2, i.e. Te > T2; (2) The current defrosting runtime t6 reaches the preset maximum allowable defrosting time threshold t7, that is, t6 > t7; The defrost exit temperature threshold T2 and the maximum allowable defrost time threshold t7 are both preset by the system or set by the user. The above two conditions are in an OR logical relationship. The defrost mode is exited if and only if either condition is true.

[0019] A fourth aspect of the present invention provides a terminal, including a processor and a storage medium; the storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to the third aspect.

[0020] A fifth aspect of the invention provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method described in the third aspect.

[0021] Compared with the prior art, the beneficial effects of the present invention include at least the following: This invention connects the heat dissipation pipes of the drive plate in series between the condenser outlet and the expansion valve inlet. In the cooling mode, the refrigerant is forced to flow through the drive plate radiator, and the heat of the drive plate is absorbed by the subcooling process to achieve "waste heat recovery". This reduces the temperature of the drive plate and improves the system energy efficiency ratio. In defrost mode, bypass piping isolates liquid cooling to prevent severe condensation or even icing on the surface of the drive board and internal components due to the low-temperature refrigerant. Ice buildup not only affects electrical insulation performance but can also lead to short circuits on the circuit board, component cracking, and ultimately drive board burnout. In this mode, the cooling system switches to air cooling using the condenser fan in conjunction with the radiator, effectively avoiding this problem.

[0022] The present invention also sets up four conditions (temperature, duration, minimum running time, and maximum interval time) to trigger defrosting, so as to avoid energy waste and equipment damage.

[0023] In summary, this invention significantly improves the stability and reliability of system operation, effectively prevents condensation during defrosting of the drive board, and extends the lifespan of electronic components. Secondly, by recovering waste heat during refrigeration, it improves the overall energy utilization efficiency of the system, achieving energy-saving effects and reducing operating costs. Finally, the precise multi-dimensional defrosting control strategy reduces the number of ineffective defrosting cycles, saves electricity, and ensures the stability of the storage temperature and the preservation quality of goods, achieving a unity of energy saving, stability, and intelligent control. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a system schematic diagram of the present invention; Figure 2 This is the refrigeration control diagram in this invention; Figure 3 This is the defrosting control diagram in this invention; In the picture: 01—Four-way valve; 02—Main solenoid valve; 03—Bypass solenoid valve; 04—Second temperature sensor; 05—Evaporator; 06—First temperature sensor; 07—Electronic expansion valve; 08—Third temperature sensor; 09—Driver board heat dissipation piping; 10 — Radiator; 11—Air door; 12 — Condenser fan; 13 — Condenser; 14—Gas-liquid separator; 15 — Compressor. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0027] Embodiment 1 of the present invention provides a driver board heat dissipation system, including: a driver board, a driver board heat dissipation pipe 09, a bypass pipe, and an air-cooled heat dissipation component; The heat dissipation pipe 09 of the drive board is disposed on the drive board, and the refrigerant dissipates heat from the drive board through the heat dissipation pipe 09 of the drive board. A heat sink 10 is provided on the outside of the drive board, and the heat sink 10 is closely attached to the power module on the drive board to achieve heat conduction of the drive board.

[0028] It is worth noting that the heat dissipation pipe 09 of the drive board and the heat sink 10 are independent of each other. When the system is cooling, the refrigerant flows through the heat dissipation pipe 09 of the drive board to dissipate heat. When defrosting, the drive board dissipates heat through the heat sink 10.

[0029] The bypass pipe is connected in parallel to both ends of the heat dissipation pipe 09 on the drive board, and a bypass solenoid valve 03 is provided on it.

[0030] This application sets up a bypass pipeline. When the system enters the defrosting mode, the bypass solenoid valve 03 is forcibly opened. At this time, after the high-temperature and high-pressure refrigerant defrosts the evaporator 05, the low-temperature refrigerant, after being throttled by the electronic expansion valve 07, flows directly to the condenser 13 through the bypass pipeline with lower resistance, instead of flowing through the drive plate heat dissipation pipeline 09 connected in series in the refrigeration circuit. This avoids the low-temperature refrigerant passing through the drive plate during defrosting, which would cause severe condensation or even freezing on the surface and internal components of the drive plate.

[0031] The air-cooled heat dissipation assembly includes: a guide air duct, an adjustable damper 11, and a condenser fan 12. The inlet of the guide air duct faces the air outlet direction of the condenser fan 12, and the outlet of the guide air duct faces the drive plate radiator 10. The adjustable damper 11 is located between the condenser fan 12 and the radiator 10.

[0032] This application utilizes the airflow generated by the condenser fan 12 during operation to perform air cooling on the drive plate via the radiator 10, eliminating the need for an additional dedicated fan, thus reducing costs and saving space.

[0033] like Figure 1 As shown, Embodiment 2 of this application provides a cooling device, including the drive board heat dissipation system as described in Embodiment 1; The refrigeration equipment also includes: compressor 15, four-way valve 01, condenser 13, electronic expansion valve 07, evaporator 05 and gas-liquid separator 14. The above components are connected in sequence through refrigerant pipelines to form a closed refrigerant circulation loop, and the main solenoid valve 02 is installed on the refrigerant circulation loop.

[0034] The drive board cooling system includes a drive board, which is a variable frequency drive board used to drive the compressor 15 and generates a large amount of heat during the variable frequency drive process of the compressor 15, so effective heat dissipation is required.

[0035] The driver board cooling system also includes: driver board cooling pipe 09, bypass pipe and air-cooled cooling components; Specifically, the heat dissipation pipe 09 of the drive board is disposed on the drive board and connected between the outlet of the condenser 13 and the inlet of the electronic expansion valve 07. An aluminum heat sink 10 is mounted on the outside of the drive board and is in close contact with the power module on the drive board for heat conduction. The bypass pipe is connected in parallel to both ends of the heat dissipation pipe 09 on the drive plate, and a bypass solenoid valve 03 is provided on it. When the bypass solenoid valve 03 is opened, the refrigerant bypasses the heat dissipation pipe 09 on the drive plate and flows directly to the condenser 13.

[0036] The air-cooled heat dissipation assembly includes: a guide air duct and an adjustable damper 11. The inlet of the guide air duct faces the air outlet direction of the condenser fan 12 (outdoor fan), and the outlet faces the aluminum heat sink 10 of the drive plate. The airflow generated by the condenser fan 12 during operation is used to cool the drive plate, eliminating the need for an additional dedicated fan.

[0037] The refrigeration equipment is also equipped with a sensor assembly, which includes: The first temperature sensor 06, used to detect the defrosting temperature of the evaporator, is installed at the bend of the evaporator 05. The second temperature sensor 04, used to detect the temperature of the storage room, is installed at the return air position of the evaporator 05. The third temperature sensor 08 is used to monitor the temperature of the drive board (or the surface temperature of the heat sink 10) and is installed on the surface of the drive board.

[0038] In the refrigeration mode, the main solenoid valve 02 is opened, the regulating damper 11 and the bypass solenoid valve 03 are closed, and the refrigerant flows through the compressor 15, the four-way valve 01, the condenser 13, the main solenoid valve 02, the drive plate pipeline 09, the electronic expansion valve 07, the evaporator 05 and the gas-liquid separator 14, and then returns to the compressor 15.

[0039] During this cooling process, the refrigerant flows through the main solenoid valve 02 and then through the drive plate pipeline 09 to absorb heat and subcool the drive plate. The refrigerant is then throttled by the electronic expansion valve 07. In cooling mode, the refrigerant is used for cooling, and the cooling capacity is greater than that of air cooling. Therefore, the regulating damper 11 is closed and air cooling is not used.

[0040] It is worth noting that in cooling mode, the main solenoid valve 02 is normally open. After the refrigerant comes out of the condenser 13, it will pass through the main solenoid valve 02 and then flow through the drive plate pipe 09 on the drive plate. Then it will pass through components such as the dryer filter and electronic expansion valve 07 and enter the evaporator 05. Finally, it will return to the compressor 15 through the gas-liquid separator 14.

[0041] In defrost mode, the four-way valve 01 reverses, controlling the main solenoid valve 02 to close, and the bypass solenoid valve 03 and regulating damper 11 to open. The refrigerant flows through the compressor 15, four-way valve 01, evaporator 05, electronic expansion valve 07, bypass solenoid valve 03, condenser 13, gas-liquid separator 14, and finally back to the compressor 15.

[0042] It is worth noting that in defrosting mode, the four-way valve 01 reverses direction, the main solenoid valve 02 closes, and the bypass solenoid valve 03 opens. The refrigerant passes through the bypass solenoid valve 03, which serves to switch the flow path. At this time, the regulating damper 11 opens, and the airflow from the condenser fan 12 passes through the radiator 10 to perform air cooling on the drive plate.

[0043] This invention connects a bypass pipe in parallel to both ends of the drive plate pipe 09 and includes a bypass solenoid valve 03. When the system is in cooling mode, the bypass solenoid valve 03 is closed, and the refrigerant flows entirely through the drive plate pipe 09 via the main solenoid valve 02, thereby absorbing heat and subcooling the drive plate, achieving liquid cooling and waste heat recovery during refrigeration. When the system enters defrosting mode, the bypass solenoid valve 03 and the regulating damper 11 are opened, and the drive plate is cooled by air by regulating the damper 11. The high-temperature, high-pressure gaseous refrigerant, i.e., the high-temperature, high-pressure hot fluorine gas, defrosts the evaporator 05 and flows directly to the condenser 13 through the bypass pipe with lower resistance, instead of flowing through the drive plate cooling pipe 09 connected in series in the refrigeration circuit. This avoids the low-temperature refrigerant after defrosting, which passes through the drive plate after being throttled by the electronic expansion valve 07, causing severe condensation or even icing on the surface and internal components of the drive plate, thus achieving air cooling and avoiding icing during defrosting.

[0044] This invention overcomes the shortcomings of traditional single heat dissipation modes in terms of safety, efficiency, and adaptability by using the complementary design of "liquid cooling to recover waste heat during refrigeration" and "air cooling to avoid icing during defrosting" in combination with the control methods of "physical isolation by bypass valve" and "compressor frequency conversion linkage". It achieves stable and efficient operation of cold storage units while realizing energy-saving effects.

[0045] like Figure 2-3 As shown, Embodiment 3 of the present invention provides a control method for the refrigeration equipment described in Embodiment 2, comprising the following steps: Step 301: When the unit is running in cooling mode, the evaporator defrosting temperature Te, duration t, compressor continuous cooling operation time t2, and defrosting interval time t4 are detected and obtained. The unit enters the hot fluorine defrosting mode if and only if the evaporator defrosting temperature Te, duration t, compressor continuous cooling operation time t2, and defrosting interval time t4 meet the first judgment condition.

[0046] Specifically, the first determination condition is: (1) The evaporator defrosting temperature Te is lower than the preset defrosting start-up temperature threshold T1, i.e. Te <T1; (2) After condition (1) is met, the duration t of this state reaches the preset confirmation time threshold t1, that is, t ≥ t1; (3) After condition (2) is met, the continuous cooling operation time t2 of the compressor has reached the preset minimum operating time threshold t3, that is, t2 ≥ t3; (4) After satisfying condition (3), the time interval t4 from the end of the last defrosting is greater than the preset minimum defrosting interval threshold t5, that is, t4 ≥ t5; The preset defrosting start temperature threshold T1, preset confirmation time threshold t1, preset minimum running time threshold t3, and preset minimum defrosting interval threshold t5 are all preset by the system or set by the user.

[0047] In a preferred but non-limiting embodiment of the present invention, when the defrosting start conditions are met, the control system can read the data from the second temperature sensor 04 to obtain the current storage temperature. If the current storage temperature is higher than the preset maximum allowable defrosting temperature (e.g., -15°C), the defrosting request is suspended and cooling continues; if the storage temperature is lower than the threshold, the defrosting procedure is executed.

[0048] The second temperature sensor 04 monitors the actual temperature inside the cold storage in real time, allowing for the viewing and recording of historical data to ensure the storage environment meets the requirements of the goods. It also serves as a safeguard against temperature runaway caused by excessive defrosting, adjusting the refrigeration output after defrosting to compensate for the lost cooling during the process and quickly restore the temperature to the set value.

[0049] Step 302: After entering the defrosting mode, control the four-way valve 01 to switch directions, close the main solenoid valve 02, open the bypass solenoid valve 03, open the regulating damper 11, and use the airflow of the condenser fan 12 to perform air cooling on the drive plate through the regulating damper 11.

[0050] Step 303: During defrosting mode, the drive board temperature Td is detected and determined whether the drive board temperature Td is greater than the drive board temperature threshold T3. If so, the condenser fan speed is adjusted; otherwise, proceed to step 304.

[0051] Specifically, during the defrosting mode, the temperature Td of the drive board is continuously monitored by the third temperature sensor 08. If the temperature Td of the drive board is greater than the temperature threshold T3 of the drive board (e.g., 85°C), the speed of the condenser fan 12 is increased first. More preferably, after the condenser fan 12 speed is increased to the maximum, if the drive board temperature Td continues to exceed the drive board temperature threshold T3, the compressor 15 is frequency reduced until the drive board temperature Td does not exceed the drive board temperature threshold T3.

[0052] Step 304: Detect and obtain the evaporator defrosting temperature Te and defrosting operation time t6. When either the evaporator defrosting temperature Te or the defrosting operation time t6 meets any of the second judgment conditions, determine to exit the hot refrigerant defrosting mode, restore the refrigeration mode, control the four-way valve 01 to reset, and close the bypass valve 03 and the regulating damper 11.

[0053] Specifically, the second determination condition is: (1) The defrosting temperature Te of the evaporator rises to above the preset defrosting exit temperature threshold T2, i.e. Te > T2; (2) The current defrosting runtime t6 reaches the preset maximum allowable defrosting time threshold t7, that is, t6 > t7; The above two conditions are OR logic relationships. If and only if either condition is true, the control unit outputs a defrost exit signal, controls the switching valve group to switch the system from hot refrigerant defrost mode back to refrigeration mode, and simultaneously restores the opening degree of the corresponding valve to the corresponding position of refrigeration state.

[0054] Embodiment 4 of the present invention provides a control method for the refrigeration equipment described in Embodiment 3. Taking the conversion of an air-cooled hot-fluorine unit in a low-temperature cold storage from refrigeration mode to hot-fluorine defrosting mode as an example, the method includes the following steps: In cooling mode, the compressor 15 operates at 60Hz, and the storage temperature gradually decreases. At this time, the bypass solenoid valve 03 closes, and the high-temperature, high-pressure refrigerant flows through the heat dissipation pipe 09 of the drive plate, which is connected in series between the outlet of the condenser 13 and the inlet of the electronic expansion valve 07, to cool the drive plate. At this time, the regulating damper 11 is closed, and no additional air cooling is involved.

[0055] After the refrigerant absorbs heat from the drive plate, its subcooling increases, thereby improving the unit's system energy efficiency; at the same time, the drive plate temperature Td is maintained at around 65℃, which is within the safe range.

[0056] Step 401: When the unit is running in cooling mode, the evaporator defrosting temperature Te, duration t, compressor continuous cooling operation time t2, and defrosting interval time t4 are detected and obtained. The unit enters the hot fluorine defrosting mode if and only if the evaporator defrosting temperature Te, duration t, compressor continuous cooling operation time t2, and defrosting interval time t4 meet the first judgment condition.

[0057] The first determination condition is: (1) The evaporator defrosting temperature Te is lower than the preset defrosting start-up temperature threshold T1, i.e. Te <T1; (2) After condition (1) is met, the duration t of this state reaches the preset confirmation time threshold t1, that is, t ≥ t1; (3) After condition (2) is met, the continuous cooling operation time t2 of the compressor has reached the preset minimum operating time threshold t3, that is, t2 ≥ t3; (4) After satisfying condition (3), the time interval t4 from the end of the last defrosting is greater than the preset minimum defrosting interval threshold t5, that is, t4 ≥ t5; The preset defrosting start temperature threshold T1, preset confirmation time threshold t1, preset minimum running time threshold t3, and preset minimum defrosting interval threshold t5 are all preset by the system or set by the user.

[0058] Specifically, in this embodiment, the defrosting start temperature threshold T1 is set to... At 5℃, with a preset confirmation time threshold t1 = 30 min, a preset minimum running time threshold t3 = 45 min, and a minimum frost interval threshold t5 = 4 h, after running for 2 hours, frost begins to form on the evaporator surface. At this point: The evaporator defrosting temperature Te was detected to have dropped to [a certain value]. 9℃ (below T1) (5℃), conditions met; The timer starts counting down t (>t1=30min), and the condition is met; Then check the cumulative continuous cooling time t2 of the compressor (>t3=45min), and the condition is met; Check the time t4 since the last defrost ended (>t5=4h). If the condition is met, enter defrost mode.

[0059] Synchronously read the storage temperature Troom from the second temperature sensor 04. 18℃. Because 18℃ < preset maximum allowable defrosting temperature At 15℃, the storage temperature is at a safe low level, allowing defrosting to begin.

[0060] Step 402: After entering the defrosting mode, control the four-way valve 01 to switch directions, close the main solenoid valve 02, open the bypass solenoid valve 03, open the regulating damper 11, and use the airflow of the condenser fan 12 to perform air cooling on the drive plate through the regulating damper 11.

[0061] Specifically, the unit begins to execute the hot defrosting mode, the four-way valve 01 reverses, the bypass solenoid valve 03 opens, the regulating damper 11 is fully opened, and the airflow of the condenser fan 12 is used to force-cool the aluminum radiator.

[0062] Step 403: During defrosting mode, the drive board temperature Td is detected and determined whether the drive board temperature Td is greater than the drive board temperature threshold T3. If so, the condenser fan speed is increased; otherwise, proceed to step 404.

[0063] In this embodiment, the drive board temperature threshold T3 is set to 90°C. During the initial defrosting stage, the drive board temperature Td begins to rise due to the loss of liquid cooling. When the drive board temperature Td reaches 90°C, the controller increases the speed of the condenser fan 12 from 700 RPM to 1000 RPM.

[0064] Assuming the ambient temperature is high, even with the condenser fan 12 running at full speed, the drive board temperature Td still rises to a high level (above 95℃) and remains there for 2 minutes without decreasing. At this point, the controller reduces the frequency, limiting the compressor 15 frequency to 50Hz (originally 60Hz) to reduce heat generation. Normal monitoring resumes only after the drive board temperature Td subsequently drops below 90℃.

[0065] Step 404: Detect and obtain the evaporator defrosting temperature Te and defrosting operation time t6. When either the evaporator defrosting temperature Te or the defrosting operation time t6 meets any of the second judgment conditions, determine to exit the hot refrigerant defrosting mode, restore the refrigeration mode, control the four-way valve 01 to reset, and close the bypass valve 03 and the regulating damper 11.

[0066] The second determination condition is: (1) The defrosting temperature Te of the evaporator rises to above the preset defrosting exit temperature threshold T2, i.e. Te > T2; (2) The current defrosting runtime t6 reaches the preset maximum allowable defrosting time threshold t7, that is, t6 > t7; The defrost exit temperature threshold T2 and the maximum allowable defrost time threshold t7 are both preset by the system or set by the user.

[0067] Specifically, in this embodiment, the defrost exit temperature threshold T2 is set to 5°C, and the maximum allowable defrost time threshold t7 is set to 20 min.

[0068] When the defrosting temperature Te of the evaporator rises back above T2 = 5°C, check the defrosting duration t6 (<t7 = 20 min). If it is not overdue, it is determined that the frost layer has melted and the defrosting exit condition is satisfied.

[0069] After exiting the defrosting mode, control the four-way valve 01 to reset, open the main path solenoid valve 02, close the bypass solenoid valve 03 and the regulating air damper 11, and resume the refrigeration mode.

[0070] Embodiment 5 of the present invention provides a terminal, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0071] Embodiment 6 of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the method are implemented.

[0072] The present disclosure may be a system, a method, and / or a computer program product. The computer program product may include a computer-readable storage medium having thereon computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0073] The computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. The computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read only memory (ROM), an erasable programmable read only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device, such as a punched card or raised structures in grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium used herein is not construed as an instantaneous signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated through a waveguide or other transmission medium (e.g., an optical pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0074] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0075] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A driver board heat dissipation system, characterized in that, include: A drive board, wherein a heat sink (10) is provided on the outside of the drive board. A heat dissipation pipe (09) is provided on the drive board, and the refrigerant dissipates heat from the drive board through the heat dissipation pipe (09). A bypass pipe is connected in parallel to both ends of the heat dissipation pipe (09) of the drive board, and a bypass solenoid valve (03) is provided on it. The air-cooled heat dissipation assembly includes: a guide air duct, an adjustable damper (11), and a condenser fan (12). The inlet of the guide air duct faces the air outlet direction of the condenser fan (12), and the outlet faces the drive plate radiator (10). The adjustable damper (11) is located between the condenser fan (12) and the radiator (10). The airflow generated by the condenser fan (12) during operation is used to cool the radiator (10) through the guide air duct and the adjustable damper (11), thereby cooling the drive plate.

2. A cooling device, comprising a drive board heat dissipation system as described in claim 1, characterized in that, It also includes: compressor (15), four-way valve (01), condenser (13), electronic expansion valve (07), evaporator (05) and gas-liquid separator (14). The above components are connected in sequence through refrigerant pipeline to form a closed refrigerant circulation loop. The main solenoid valve (02) is set on the refrigerant circulation loop.

3. A refrigeration device according to claim 2, characterized in that, The drive plate heat dissipation pipe (09) is connected between the outlet of the condenser (13) and the inlet of the electronic expansion valve (07).

4. A refrigeration device according to claim 2, characterized in that, The refrigeration equipment further includes a sensor assembly, which comprises: The first temperature sensor (06) is used to detect the defrosting temperature Te of the evaporator and is installed at the bend of the evaporator (05); The second temperature sensor (04) is used to detect the temperature of the storage room and is installed at the return air position of the evaporator (05); The third temperature sensor (08) is used to monitor the temperature Td of the drive board and is installed on the surface of the drive board.

5. A refrigeration device according to claim 2, characterized in that, In the refrigeration mode, the main solenoid valve (02) is opened, the regulating damper (11) and the bypass solenoid valve (03) are closed, and the refrigerant flows through the compressor (15), the four-way valve (01), the condenser (13), the main solenoid valve (02), the drive plate heat dissipation pipe (09), the electronic expansion valve (07), the evaporator (05) and the gas-liquid separator (14), and then returns to the compressor (15).

6. A refrigeration device according to claim 5, characterized in that, During the refrigeration process, after the refrigerant flows out from the compressor (15), it flows through the main solenoid valve (02) and then through the heat dissipation pipe (09) of the drive board, thereby absorbing heat and subcooling the drive board to achieve heat dissipation of the refrigerant on the drive board.

7. A refrigeration device according to claim 2, characterized in that, In defrosting mode, the four-way valve (01) of the refrigeration equipment reverses, controls the main solenoid valve (02) to close, and opens the bypass solenoid valve (03) and the regulating damper (11). The refrigerant flows through the compressor (15), the four-way valve (01), the evaporator (05), the electronic expansion valve (07), the bypass solenoid valve (03), the condenser (13), the gas-liquid separator (14), and finally back to the compressor (15).

8. A refrigeration device according to claim 7, characterized in that, During the defrosting process, the bypass solenoid valve (03) is opened, and the refrigerant passes through the bypass solenoid valve (03) without flowing through the heat dissipation pipe (09) of the drive plate. At this time, the regulating damper (11) is opened, and the airflow of the condenser fan (12) passes through the radiator (10) to perform air cooling heat dissipation on the drive plate.

9. A control method for a refrigeration device according to any one of claims 2-8, characterized in that, Includes the following steps: Step 1: When the refrigeration equipment is running in refrigeration mode, the defrosting temperature Te, duration t, continuous refrigeration operation time t2 of the compressor, and defrosting interval time t4 of the evaporator are detected and obtained. The refrigeration equipment enters defrosting mode if and only if the defrosting temperature Te, duration t, continuous refrigeration operation time t2 of the compressor, and defrosting interval time t4 meet the first judgment condition. Step 2: After entering the defrosting mode, control the four-way valve (01) to switch, close the main solenoid valve (02), open the bypass solenoid valve (03) and the regulating damper (11), and use the airflow of the condenser fan (12) to cool the drive plate through the regulating damper (11). Step 3: During the defrosting mode, the temperature Td of the drive board is detected and it is determined whether the temperature Td of the drive board is greater than the temperature threshold T3 of the drive board. If so, the speed of the condenser fan (12) is adjusted. If not, proceed to step 4. Step 4: Detect and obtain the evaporator defrosting temperature Te and defrosting operation time t6. When the evaporator defrosting temperature Te or the defrosting operation time t6 meets any of the second judgment conditions, it is determined that the refrigeration equipment exits the defrosting mode and resumes the refrigeration mode. Then, the four-way valve (01) is reset, the main solenoid valve (02) is opened, and the bypass solenoid valve (03) and the regulating damper (11) are closed.

10. The control method according to claim 9, characterized in that, The first determination condition is: (1) The evaporator defrosting temperature Te is lower than the preset defrosting start-up temperature threshold T1, i.e. Te <T1; (2) After condition (1) is met, the duration t of this state reaches the preset confirmation time threshold t1, that is, t ≥ t1; (3) After condition (2) is met, the continuous cooling operation time t2 of the compressor has reached the preset minimum operating time threshold t3, that is, t2 ≥ t3; (4) After satisfying condition (3), the time interval t4 from the end of the last defrosting is greater than the preset minimum defrosting interval threshold t5, that is, t4 ≥ t5; The preset defrosting start temperature threshold T1, preset confirmation time threshold t1, preset minimum running time threshold t3, and preset minimum defrosting interval threshold t5 are all preset by the system or set by the user.

11. The control method according to claim 9, characterized in that, The second determination condition is: (1) The defrosting temperature Te of the evaporator rises to above the preset defrosting exit temperature threshold T2, i.e. Te > T2; (2) The current defrosting runtime t6 reaches the preset maximum allowable defrosting time threshold t7, that is, t6 > t7; The defrost exit temperature threshold T2 and the maximum allowable defrost time threshold t7 are both preset by the system or set by the user. The above two conditions are in an OR logical relationship. The defrost mode is exited if and only if either condition is true.

12. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 9-11.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 9-11.

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