Control method for reducing energy consumption of multi-system refrigerator

Abstract

The invention discloses a control method for reducing energy consumption of a multi-system refrigerator. The control method comprises the following specific steps that firstly, the refrigerator is powered on to operate; 2, whether the compressor starting condition is met or not is judged, and any one of the following conditions is met; 3, environment temperature and load judgment and response are carried out; 4, system load depth judgment and final control are carried out; fifthly, the compressor continues to operate, and the reversing valve executes a refrigeration circulation loop from the freezing side to the refrigeration side; 6, whether the temperature of the refrigerating chamber is smaller than the shutdown point temperature or not is judged; seventhly, the compressor continues to operate, and the reversing valve is switched from the refrigerating chamber side to the multifunctional chamber side; 8, judging whether the temperature of the multifunctional chamber is lower than the temperature of a shutdown point or not; 9, continuing to operate the compressor, switching the side of the reversing valve to the side of the freezing chamber, and executing a refrigeration circulation loop; tenthly, whether the temperature of the freezing chamber is smaller than the temperature of the shutdown point or not is judged; and eleventhly, the temperature of all the chambers reaches the shutdown set value, and the compressor stops running.

Description

Technical field:

[0001] The invention relates to a control method for reducing energy consumption of a multi-system refrigerator, and belongs to the technical field of refrigerators. Background technology:

[0002] As multi-system refrigerator technology continues to evolve, breakthroughs and upgrades have been made in anti-odor transfer technology, temperature control accuracy, and freshness preservation performance. To achieve higher energy efficiency goals, the industry generally adopts a series-parallel system design architecture. However, this design approach has a technical blind spot in controlling startup power consumption. The peak power consumption at startup far exceeds the steady-state operating power consumption, which not only increases energy consumption but also increases wear on internal components and shortens the compressor's lifespan.

[0003] Currently, mainstream low-power startup solutions rely on passively controlling startup energy consumption by reducing the initial compressor speed. However, these solutions only improve variable-frequency compressor systems, not fixed-frequency systems. They also lack dynamic adjustment of the refrigeration system's startup pressure balance and fail to fundamentally optimize the compressor's startup load. Therefore, innovative technologies are urgently needed to overcome the limitations of existing passive control and achieve active optimization of the compressor startup process, thus opening up new avenues for improving the energy efficiency and reliability of multi-system refrigerators. Summary of the invention:

[0004] To address the aforementioned problems of the prior art, the present invention provides a control method for reducing energy consumption in multi-system refrigerators. This method accurately determines the refrigerator's current load by real-time monitoring of data from ambient temperature sensors, non-freezer compartment temperature sensors, and freezer compartment temperature sensors. Based on the different loads, when the compressor is shut down, multiple compartments are requesting cooling simultaneously, or a non-freezer compartment receives a cooling request, the system appropriately switches the direction of the reversing valve according to the refrigerator's load. This prioritizes the start-up of the refrigeration and freezing circuits, accurately optimizing system load distribution during compressor startup and minimizing overall refrigeration system operating pressure.

[0005] The technical solution adopted by the present invention is: a control method for reducing energy consumption of a multi-system refrigerator, the specific steps of which are as follows:

[0006] Step 1: Turn on the power of the refrigerator;

[0007] Step 2: Determine whether the compressor startup conditions are met, and any of the following conditions are met;

[0008] Step 3: Ambient temperature and load judgment and response;

[0009] Step 4: System load depth judgment and final control;

[0010] Step 5: The compressor continues to run, and the reversing valve switches from the freezing side to the refrigeration side to execute the refrigeration cycle;

[0011] Step 6: Determine whether the refrigeration compartment temperature is lower than the shutdown point temperature;

[0012] Step 7: The compressor continues to run, and the reversing valve switches from the refrigeration room side to the multi-function room side to execute the refrigeration cycle.

[0013] Step 8: Determine whether the temperature of the multi-functional room is lower than the shutdown point temperature:

[0014] Step 9: The compressor continues to run, and the reversing valve switches to the freezer side, executing the refrigeration cycle;

[0015] Step 10: Determine whether the freezer compartment temperature is lower than the shutdown point temperature:

[0016] Step 11: All compartment temperatures reach the shutdown set value and the compressor stops running.

[0017] Furthermore, step 2 is as follows:

[0018] 2.1. When the freezer compartment temperature is lower than its power-on set value, and the refrigerator compartment or multi-function compartment temperature is 2°C higher than the corresponding power-on set value, that is, when the freezer compartment sensor temperature Tfs is less than the freezer compartment power-on temperature Tfs-on, the multi-compartment sensor temperature Tds is greater than the multi-function compartment power-on temperature Tds-on+2°C, or the refrigerator compartment sensor temperature Trs is greater than the refrigerator compartment power-on temperature Trs-on+2°C;

[0019] 2.2. If the temperatures of the refrigerator compartment, multi-function compartment, and freezer compartment are all higher than their respective power-on set values, that is, if the refrigerator compartment sensor temperature Trs > refrigerator compartment power-on temperature Trs-on, the multi-compartment sensor temperature Tds > multi-function compartment power-on temperature Tds-on, and the freezer compartment sensor temperature Tfs > freezer compartment power-on temperature Tfs-on are all satisfied at the same time;

[0020] 2.3. If the above conditions are met, immediately switch the reversing valve to the freezing side and start the compressor to run for t1 minute before proceeding to the next step of judgment.

[0021] 2.4. If the above conditions are not met, the machine will remain in shutdown state and the startup conditions will be determined again.

[0022] Furthermore, step three is as follows: the system reads the ambient temperature sensor temperature Te and compares it with the set ambient temperature threshold Te(X) to determine the ambient temperature load:

[0023] 3.1. If Te<Te(X), proceed to step 5 to determine whether the machine should be shut down.

[0024] 3.2. If Te ≥ Te(X), it indicates that the current ambient temperature is high and the system load is heavy. At this time, the solenoid valve remains on the freezing side and the compressor continues to run for t(n) minutes. After that, the system load depth is evaluated and final control is carried out.

[0025] Furthermore, step four is as follows:

[0026] 4.1. By comparing the difference between the ambient temperature sensor temperature Te and the evaporator temperature, the system load change trend can be further determined:

[0027] (1) When the temperature difference between the ambient temperature and the refrigeration evaporator sensor ΔTe-fd ≤ 15°C, it means that the system load is small; then go to step 5 shutdown judgment;

[0028] (2) If the temperature difference between the ambient temperature and the refrigeration evaporator sensor ΔTe-fd>15°C, proceed to step 4.2;

[0029] 4.2. Determine whether the cumulative cooling time of the compressor on the refrigeration side reaches 30 minutes (i.e. t = (t1 + t2 + ... + tn) ≥ 30 minutes)

[0030] (1) If t = (t1 + t2 + ... + tn) ≥ 30 minutes, proceed to step 5;

[0031] (2) If t = (t1 + t2 + ... + tn) < 30 minutes, the compressor continues to run for t (n) minutes and then enters step 4.1 for re-judgment.

[0032] Furthermore, step six is ​​as follows:

[0033] 6.1. If the refrigeration compartment sensor temperature Trs ≤ the refrigeration compartment shutdown temperature Trs-off, proceed to step 7;

[0034] 6.2. If the refrigeration compartment sensor temperature Trs>refrigeration compartment shutdown temperature Trs-off, enter the cycle step six.

[0035] 6. The control method for reducing energy consumption of a multi-system refrigerator according to claim 5, wherein step eight is specifically as follows:

[0036] 8.1. If the multi-compartment sensor temperature Tds ≤ the multi-function compartment shutdown temperature Tds-off, proceed to step nine;

[0037] 8.2. If the multi-compartment sensor temperature Tds> the multi-function compartment shutdown temperature Tds-off, enter the cycle step eight.

[0038] Furthermore, step ten is specifically as follows:

[0039] 10.1. If the freezer compartment sensor temperature Tfs ≤ the freezer compartment shutdown temperature Tfs-off, proceed to step 11;

[0040] 10.2. If the freezer compartment sensor temperature Tfs>the freezer compartment shutdown temperature Tfs-off, then enter the loop step ten.

[0041] The present invention has the following beneficial effects: through systematic energy-saving optimization, the present invention effectively reduces the energy consumption of compressor startup, effectively avoids the instantaneous large current when the compressor starts, reduces the current impact on the main control board, and can simultaneously achieve the effects of reducing energy consumption and enhancing the reliability of the main board, ultimately achieving the dual benefits of energy saving and emission reduction. Description of the drawings:

[0042] Figure 1 This is the schematic diagram of the dual-system refrigeration.

[0043] Figure 2 This is a three-system refrigeration principle diagram (the cold storage room and the multi-function room are connected in parallel).

[0044] Figure 3 This is a schematic diagram of the three-system refrigeration system (the cold storage room and the multi-function room are connected in series).

[0045] Figure 4 This is a flow chart of the control method for reducing energy consumption of a multi-system refrigerator according to the present invention. Specific implementation method:

[0046] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the implementation of the application described herein, for example, can be implemented in an order other than those illustrated or described herein. In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way.

[0048] In the existing related technologies, when the refrigerator has dual systems, the pipe connection method is as follows Figure 1 As shown:

[0049] 1) When the reversing valve is switched to the first capillary tube, the refrigeration evaporator forms a refrigeration cycle alone.

[0050] 2) When the reversing valve is switched to the second capillary tube, the refrigeration evaporator and the freezing evaporator are connected in series to form a refrigeration cycle.

[0051] When there are three systems in the refrigerator, a pipe connection method is as follows Figure 2 As shown:

[0052] 1) When the reversing valve is switched to the first capillary tube, the refrigeration evaporator forms a refrigeration cycle alone.

[0053] 2) When the reversing valve is switched to the second capillary tube, the multifunctional compartment evaporator and the freezing evaporator are connected in series to form a refrigeration cycle.

[0054] 3) When the reversing valve is switched to the third capillary tube, the refrigeration evaporator and the freezing evaporator are connected in series to form a refrigeration cycle.

[0055] When there are three systems in the refrigerator, another way to connect the pipes is as follows Figure 3 As shown:

[0056] 1) When the reversing valve is switched to the first capillary tube, the refrigeration evaporator forms a refrigeration cycle alone.

[0057] 2) When the reversing valve is switched to the second capillary tube, the multifunctional compartment evaporator and the freezing evaporator are connected in series to form a refrigeration cycle.

[0058] 3) When the reversing valve is switched to the third capillary tube, the refrigeration evaporator, the multifunctional compartment evaporator and the freezing evaporator are connected in series to form a refrigeration cycle.

[0059] The control method for reducing energy consumption of a multi-system refrigerator of the present invention comprises the following specific steps:

[0060] Step 1: Turn on the power of the refrigerator;

[0061] Step 2: Determine whether the compressor startup conditions are met, and whether any of the following conditions are met:

[0062] 2.1. When the freezer compartment temperature is lower than its power-on set value, and the refrigerator compartment or multi-function compartment temperature is 2°C higher than the corresponding power-on set value, that is, when the freezer compartment sensor temperature Tfs is less than the freezer compartment power-on temperature Tfs-on, the multi-compartment sensor temperature Tds is greater than the multi-function compartment power-on temperature Tds-on+2°C, or the refrigerator compartment sensor temperature Trs is greater than the refrigerator compartment power-on temperature Trs-on+2°C;

[0063] 2.2. If the temperatures of the refrigerator compartment, multi-function compartment, and freezer compartment are all higher than their respective power-on set values, that is, if the refrigerator compartment sensor temperature Trs > refrigerator compartment power-on temperature Trs-on, the multi-compartment sensor temperature Tds > multi-function compartment power-on temperature Tds-on, and the freezer compartment sensor temperature Tfs > freezer compartment power-on temperature Tfs-on are all satisfied at the same time;

[0064] 2.3. If the above conditions are met, immediately switch the reversing valve to the freezing side and start the compressor to run for t1 minute before proceeding to the next step of judgment.

[0065] 2.4. If the above conditions are not met, the machine will remain in shutdown state and the restart condition will be determined again.

[0066] Step 3: Ambient temperature and load judgment and response:

[0067] The system reads the ambient temperature sensor temperature Te and compares it with the set ambient temperature threshold Te(X) to determine the ambient temperature load:

[0068] 3.1. If Te<Te(X), proceed to step 5 to determine whether the machine should be shut down.

[0069] 3.2. If Te ≥ Te(X), it indicates that the current ambient temperature is high and the system load is heavy. At this time, the solenoid valve remains on the freezing side and the compressor continues to run for t(n) minutes. After that, the system load depth is evaluated and final control is carried out.

[0070] Step 4: System load depth judgment and final control:

[0071] 4.1. By comparing the difference between the ambient temperature sensor temperature Te and the evaporator temperature, the system load change trend can be further determined:

[0072] (1) When the temperature difference between the ambient temperature and the refrigeration evaporator sensor ΔTe-fd ≤ 15°C, it means that the system load is small; then go to step 5 shutdown judgment;

[0073] (2) If the temperature difference between the ambient temperature and the refrigeration evaporator sensor ΔTe-fd>15°C, proceed to step 4.2;

[0074] 4.2. Determine whether the cumulative cooling time of the compressor on the refrigeration side reaches 30 minutes (i.e. t = (t1 + t2 + ... + tn) ≥ 30 minutes)

[0075] (1) If t = (t1 + t2 + ... + tn) ≥ 30 minutes, proceed to step 5;

[0076] (2) If t = (t1 + t2 + ... + tn) < 30 minutes, the compressor continues to run for t (n) minutes and then enters step 4.1 for re-judgment.

[0077] Step 5: The compressor continues to run, and the reversing valve switches from the freezing side to the refrigeration side (such as Figure 1 Switch to the second capillary, such as Figure 2 Switch to the third capillary, such as Figure 3 The refrigeration cycle is carried out by switching to the third capillary tube.

[0078] Step 6: Determine whether the refrigerator compartment temperature is lower than the shutdown point temperature:

[0079] 6.1. If the refrigeration compartment sensor temperature Trs ≤ the refrigeration compartment shutdown temperature Trs-off, proceed to step 7;

[0080] 6.2. If the refrigeration compartment sensor temperature Trs>refrigeration compartment shutdown temperature Trs-off, then enter the cycle step six;

[0081] Step 7: The compressor continues to run, and the reversing valve switches from the refrigeration room side to the multi-function room side. (If Figure 2 and Figure 3 The refrigeration cycle is performed by switching to the second capillary tube.

[0082] Step 8: Determine whether the temperature of the multi-functional room is lower than the shutdown point temperature:

[0083] 8.1. If the multi-compartment sensor temperature Tds ≤ the multi-function compartment shutdown temperature Tds-off, proceed to step nine;

[0084] 8.2. If the multi-compartment sensor temperature Tds> the multi-function compartment shutdown temperature Tds-off, enter the cycle step eight.

[0085] Step 9: The compressor continues to run, and the reversing valve side is switched to the freezer side (such as Figure 1 、 Figure 2 and Figure 3 to the first capillary tube) to execute the refrigeration cycle.

[0086] Step 10: Determine whether the freezer compartment temperature is lower than the shutdown point temperature:

[0087] 10.1. If the freezer compartment sensor temperature Tfs ≤ the freezer compartment shutdown temperature Tfs-off, proceed to step 11;

[0088] 10.2. If the freezer compartment sensor temperature Tfs>the freezer compartment shutdown temperature Tfs-off, then enter the loop step ten.

[0089] Step 11: All compartment temperatures reach the shutdown set value and the compressor stops running.

[0090] The present invention monitors the temperature of the ambient temperature sensor, the temperature difference between the ambient temperature and the freezer evaporator sensor in real time, and combines time synchronization to accurately determine the refrigerator system load, dynamically adjust the direction of the reversing valve, and reduce the heat load of the refrigeration system at startup, thereby reducing startup power loss and achieving lower energy consumption.

[0091] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for reducing energy consumption of a multi-system refrigerator, characterized by: The specific steps are as follows: Step 1: Turn on the power of the refrigerator; Step 2: Determine whether the compressor startup conditions are met, and any of the following conditions are met; Step 3: Ambient temperature and load judgment and response; Step 4: System load depth judgment and final control; Step 5: The compressor continues to run, and the reversing valve switches from the freezing side to the refrigeration side to execute the refrigeration cycle; Step 6: Determine whether the refrigeration compartment temperature is lower than the shutdown point temperature; Step 7: The compressor continues to run, and the reversing valve switches from the refrigeration compartment side to the multi-function compartment side; Step 8: Determine whether the temperature of the multi-functional room is lower than the shutdown point temperature: Step 9: The compressor continues to run, and the reversing valve switches to the freezer side, executing the refrigeration cycle; Step 10: Determine whether the freezer compartment temperature is lower than the shutdown point temperature: Step 11: All compartment temperatures reach the shutdown set value and the compressor stops running.

2. The control method for reducing energy consumption of a multi-system refrigerator according to claim 1, wherein: Step 2 is as follows: 2.

1. When the freezer compartment temperature is lower than its power-on set value, and the refrigerator compartment or multi-function compartment temperature is 2°C higher than the corresponding power-on set value, that is, when the freezer compartment sensor temperature Tfs is less than the freezer compartment power-on temperature Tfs-on, the multi-compartment sensor temperature Tds is greater than the multi-function compartment power-on temperature Tds-on+2°C, or the refrigerator compartment sensor temperature Trs is greater than the refrigerator compartment power-on temperature Trs-on+2°C; 2.

2. If the temperatures of the refrigerator compartment, multi-function compartment, and freezer compartment are all higher than their respective power-on set values, that is, if the refrigerator compartment sensor temperature Trs > refrigerator compartment power-on temperature Trs-on, the multi-compartment sensor temperature Tds > multi-function compartment power-on temperature Tds-on, and the freezer compartment sensor temperature Tfs > freezer compartment power-on temperature Tfs-on are all satisfied at the same time; 2.

3. If the above conditions are met, immediately switch the reversing valve to the freezing side and start the compressor to run for t1 minute before proceeding to the next step of judgment. 2.

4. If the above conditions are not met, the machine will remain in shutdown state and the startup conditions will be determined again.

3. The control method for reducing energy consumption of a multi-system refrigerator according to claim 2, wherein: Step 3 is as follows: The system reads the ambient temperature sensor temperature Te and compares it with the set ambient temperature threshold Te(X) to determine the ambient temperature load: 3.

1. If Te<Te(X), proceed to step 5 to determine whether the machine should be shut down. 3.

2. If Te ≥ Te(X), it indicates that the current ambient temperature is high and the system load is heavy. At this time, the solenoid valve remains on the freezing side and the compressor continues to run for t(n) minutes. After that, the system load depth is evaluated and final control is carried out.

4. The control method for reducing energy consumption of a multi-system refrigerator according to claim 3, wherein: Step 4 is as follows: 4.

1. By comparing the difference between the ambient temperature sensor temperature Te and the evaporator temperature, the system load change trend can be further determined: (1) When the temperature difference between the ambient temperature and the refrigeration evaporator sensor ΔTe-fd ≤ 15°C, it means that the system load is small; then go to step 5 shutdown judgment; (2) If the temperature difference between the ambient temperature and the refrigeration evaporator sensor ΔTe-fd>15°C, proceed to step 4.2; 4.

2. Determine whether the cumulative cooling time of the compressor on the refrigeration side reaches 30 minutes (i.e. t = (t1 + t2 + ... + tn) ≥ 30 minutes) (1) If t = (t1 + t2 + ... + tn) ≥ 30 minutes, proceed to step 5; (2) If t = (t1 + t2 + ... + tn) < 30 minutes, the compressor continues to run for t (n) minutes and then enters step 4.1 for re-judgment.

5. The control method for reducing energy consumption of a multi-system refrigerator according to claim 4, wherein: Step 6 is as follows: 6.

1. If the refrigeration compartment sensor temperature Trs ≤ the refrigeration compartment shutdown temperature Trs-off, proceed to step 7; 6.

2. If the refrigeration compartment sensor temperature Trs>refrigeration compartment shutdown temperature Trs-off, enter the cycle step six.

6. The control method for reducing energy consumption of a multi-system refrigerator according to claim 5, wherein: Step 8 is as follows: 8.

1. If the multi-compartment sensor temperature Tds ≤ the multi-function compartment shutdown temperature Tds-off, proceed to step nine; 8.

2. If the multi-compartment sensor temperature Tds> the multi-function compartment shutdown temperature Tds-off, enter the cycle step eight.

7. The control method for reducing energy consumption of a multi-system refrigerator according to claim 6, wherein: Step 10 is as follows: 10.

1. If the freezer compartment sensor temperature Tfs ≤ the freezer compartment shutdown temperature Tfs-off, proceed to step 11; 10.

2. If the freezer compartment sensor temperature Tfs>the freezer compartment shutdown temperature Tfs-off, then enter the loop step ten.

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