Dual-frequency conversion control method, refrigerating system and refrigerating equipment

Abstract

The invention relates to the technical field of refrigeration control, and provides a dual-frequency-conversion control method which comprises the following steps: starting up for the first time; the compressor operates at a preset frequency, and the frequency is increased by 10 HZ every certain time interval; the compressor is started again and operates at the previous shutdown frequency; restarting the compressor; the operation frequency of the previous operation cycle is the reference frequency; according to the starting rate of the previous operation period, the operation frequency of the compressor in the period is determined; when the running frequencies of the compressors in multiple continuous running cycles are consistent, the starting rate of the compressor in the last cycle is used as the reference starting rate; and the operation voltage of the condensation fan is determined by combining the initial voltage of the condensation fan. Therefore, according to the invention, the operation frequency of the compressor is adjusted through the starting-up rate; and the operation voltage of the condensation fan is adjusted according to the starting rate after the compressor reaches the steady state, so that the rotating speed of the condensation fan is matched with the refrigeration working condition. The invention further provides a refrigerating system and refrigerating equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration control, and in particular relates to a dual-frequency conversion control method, a refrigeration system and a refrigeration device. Background Art

[0002] Existing variable frequency freezers place the condenser in the compressor compartment and use an AC fan for heat dissipation. AC fans typically operate at a fixed speed and, under any operating condition, start or stop at a fixed voltage and speed.

[0003] When the refrigeration system operates at low power consumption or the ambient temperature is low, the fan speed remains unchanged, resulting in high power consumption.

[0004] Some freezers are equipped with ambient temperature sensors to detect the ambient temperature and adjust the fan speed accordingly. This method can save some energy, but it increases the cost of the ambient temperature sensor. Moreover, the fan speed adjustment cannot be adapted to the operating conditions of the refrigeration system, which may hinder the smooth operation of the refrigeration system.

[0005] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0006] In view of the above-mentioned defects, the present invention mainly provides a dual-frequency control method to solve the technical problem of matching the speed regulation of the condensing fan with the operating conditions of the refrigeration system.

[0007] In order to solve the above problems, the present invention provides a dual frequency conversion control method, comprising the following steps:

[0008] S1, first power on;

[0009] The compressor runs at a predetermined frequency, and the frequency of the compressor increases by 10HZ at regular intervals.

[0010] S2, when the refrigeration temperature reaches the preset temperature, the compressor stops; and the operating frequency at the time of shutdown is recorded;

[0011] In step S3, the compressor is started again and operates at the shutdown frequency of the compressor in step S2; when the refrigeration temperature reaches the preset temperature, the compressor is shut down; and the startup rate of the compressor in this operation cycle is recorded;

[0012] S4, the compressor starts again;

[0013] The operating frequency of the compressor in the previous operating cycle is used as the reference frequency; and the operating frequency of the compressor in this cycle is determined based on the start-up rate of the compressor in the previous operating cycle;

[0014] The compressor runs at the determined frequency until the refrigeration temperature reaches the preset temperature and then stops. The compressor start-up rate of this operating cycle is recorded. The method for determining the compressor operating frequency of this cycle is shown in the following table:

[0015]

[0016]

[0017] S5, the compressor operates for multiple cycles in the manner of step S4;

[0018] S6: When the operating frequency of the compressor is consistent for multiple consecutive operating cycles, the operating rate of the compressor in the last cycle is used as the base operating rate;

[0019] S7, based on the reference on-rate in step S6 and in combination with the initial voltage of the condensing fan, determining the operating voltage of the condensing fan; the method for determining the operating voltage of the condensing fan is shown in the following table:

[0020] Baseline startup rate / % Condensing fan operating voltage / V 0～30 Fan off 30～60 Initial voltage -2 60～70 Initial voltage -1 70～80 Initial voltage -0.5 80～90 Initial voltage 90～100 Initial voltage +0.5

[0021] S8, repeat steps S4-S7.

[0022] According to the dual-frequency conversion control method of the present invention, in step S1, the operating frequency of the compressor when it is first started is 80 Hz.

[0023] According to the dual-frequency conversion control method of the present invention, in step S1, the operating frequency of the compressor increases by 10 Hz every 5 minutes; the upper limit of the operating frequency of the compressor is 140 Hz.

[0024] According to the dual-frequency conversion control method of the present invention, the number of the multiple consecutive operation cycles of step S6 is 2-4.

[0025] According to the dual-frequency conversion control method of the present invention, the number of the multiple consecutive operation cycles of step S6 is 3.

[0026] According to the dual-frequency conversion control method of the present invention, in step S6, when the operating frequencies of the compressors are consistent for multiple consecutive operating cycles, it is determined whether the operating time of the last cycle is ≥ 3 hours;

[0027] If the running time of the last cycle is ≥3 hours, then execute the subsequent steps;

[0028] If the running time of the last cycle is less than 3 hours, the process returns to step S4.

[0029] A refrigeration system for executing the dual-frequency conversion control method comprises a compressor, a condenser, a throttling device and an evaporator which are cyclically connected in sequence; the condensing fan is provided on one side of the condenser.

[0030] A refrigeration device comprises a box body, in which the refrigeration system is arranged.

[0031] According to the refrigeration equipment of the present invention, a compressor chamber is provided at the lower portion of the box body, and the compressor, condenser and condensing fan are installed in the compressor chamber.

[0032] The refrigeration device according to the present invention is a refrigerator or a freezer.

[0033] In summary, the dual-frequency control method of the present invention adjusts the operating frequency of the compressor in the next operating cycle through the start-up rate of two adjacent operating cycles. The function of changing the compressor frequency according to the refrigeration needs is realized, thereby reducing the operating energy consumption. The operating voltage of the condensing fan is adjusted according to the start-up rate of the compressor after it reaches a steady state. The speed of the condensing fan is matched with the refrigeration working conditions, reducing the operating energy consumption while ensuring the heat dissipation capacity. The present invention uses the stable operation of multiple consecutive cycles as the basis for judging whether the compressor has reached a steady state. It avoids the misadjustment of the fan speed caused by instantaneous load fluctuations, enhances the anti-interference ability of the system, and improves the stability of the control. It avoids the impact of improper start and stop of the fan on the life of the equipment. At the same time, it reduces noise and improves the user experience. The present invention also provides a refrigeration system and refrigeration equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the refrigeration system of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the refrigeration equipment of the present invention;

[0036] In the figure: 1- compressor, 11- condenser, 12- condensing fan, 13- evaporator, 14- capillary tube; 2- box body, 21- compressor chamber. DETAILED DESCRIPTION

[0037] See also Figure 1 The present invention provides a dual-frequency conversion control method, comprising the following steps:

[0038] S1, first power on;

[0039] The compressor 1 operates at a predetermined frequency, and the operating frequency of the compressor 1 increases by 10 Hz at regular intervals;

[0040] The first startup of the present invention may be the first power-on operation of the refrigeration device or the power-on operation after the device is powered off.

[0041] When the compressor is first started, the operating frequency of the compressor 1 can be adaptively set according to the requirements of parameters such as refrigeration efficiency, noise range, etc. Optionally, in step S1 of the present invention, the operating frequency of the compressor 1 when it is first started is 80HZ.

[0042] Furthermore, in step S1, the operating frequency of the compressor 1 increases by 10 Hz every 5 minutes; the upper limit of the operating frequency of the compressor 1 is 140 Hz.

[0043] S2, when the refrigeration temperature reaches the preset temperature, compressor 1 stops; and the operating frequency at the time of shutdown is recorded;

[0044] Optionally, the refrigeration temperature of the present invention is the temperature measured by the temperature sensor in the storage room; the preset temperature is the threshold temperature set by the refrigeration system control unit. When the refrigeration temperature is higher than the preset temperature, the compressor 1 starts refrigeration; when the refrigeration temperature reaches or falls below the preset temperature, the compressor 1 stops.

[0045] In step S3, the compressor 1 is started again and operates at the shutdown frequency of the compressor 1 in step S2; when the refrigeration temperature reaches the preset temperature, the compressor 1 is shut down; and the startup rate of the compressor 1 in this operation cycle is recorded;

[0046] The operating cycle of the present invention is the sum of the operating time and the downtime of the compressor 1. The startup rate of the compressor 1 is: the percentage of the operating time to the operating cycle.

[0047] Optionally, the operation cycle of the present invention is the interval between two adjacent start-up moments of the compressor 1.

[0048] Optionally, the operation cycle of the present invention is the interval between two adjacent shutdown moments of the compressor 1.

[0049] S4, compressor 1 starts again;

[0050] The operating frequency of the compressor 1 in the previous operating cycle is used as the reference frequency; the operating frequency of the compressor 1 in this cycle is determined based on the startup rate of the compressor 1 in the previous operating cycle; the method for determining the operating frequency of the compressor 1 in this cycle is shown in Table 1;

[0051] Compressor 1 operates at the determined frequency until the refrigeration temperature reaches the preset temperature and then stops; the operating rate of compressor 1 in this operating cycle is recorded;

[0052] Table 1: Method for determining the frequency of the new cycle of compressor 1

[0053] The operating rate of the compressor in the last operating cycle / % The operating frequency of the compressor during this period / Hz 0～10 Base frequency -30 10～20 Base frequency -30 20～30 Base frequency -20 30～40 Base frequency -20 40～50 Base frequency -10 50～60 Base frequency -5 60～70 Base frequency -5 70～80 Base frequency -2 80～90 Reference frequency 90～100 Base frequency + 2

[0054] S5, compressor 1 operates in sequence for multiple cycles in the manner of step S4;

[0055] S6, when the operating frequency of the compressor 1 is consistent for multiple consecutive operating cycles, the operating rate of the compressor 1 in the last cycle is used as the reference operating rate;

[0056] S7, determining the operating voltage of the condensing fan 12 based on the reference operating rate of step S6 and the initial voltage of the condensing fan 12;

[0057] Optionally, the initial voltage of the condensing fan 12 of the present invention is the voltage value when it is first operated. The initial voltage of the present invention is 10V, and those skilled in the art can make adaptive settings according to the heat dissipation requirements of the specific refrigeration equipment.

[0058] As an embodiment, the operating voltage of the condensing fan 12 of the present invention is adjusted by adjusting the frequency of the condensing fan 12.

[0059] The present invention uses the consistency of the frequency of multiple continuous operating cycles as the basis for judging whether the compressor 1 has reached a stable state, eliminates interference factors such as load fluctuations in the refrigeration system, avoids misadjustment of the operating voltage of the condensing fan 12, and further avoids the phenomenon of poor heat dissipation due to misadjustment affecting the life of the equipment or excessive operation of the condensing fan 12 increasing energy consumption.

[0060] As an embodiment, the number of the continuous multiple operation cycles of step S6 of the present invention is: 2-4. The present invention is preferably 3 cycles, which can ensure that the compressor 1 reaches a stable state and can timely adjust the operating voltage of the condensing fan 12 to optimize the operation of the system.

[0061] The method for determining the operating voltage of the condensing fan 12 is shown in Table 2;

[0062] Table 2: Method for determining the operating voltage of the condensing fan 12

[0063]

[0064]

[0065] S8, repeat steps S4-S7;

[0066] The present invention adjusts the operating frequency of compressor 1 for the next operating cycle based on the operating rates of two adjacent operating cycles. This allows the frequency of compressor 1 to be adjusted according to cooling needs, reducing operating energy consumption. The operating voltage of condenser fan 12 is adjusted based on the operating rate of compressor 1 after reaching steady state. This ensures that the speed of condenser fan 12 matches the cooling conditions, reducing operating energy consumption while ensuring heat dissipation capacity.

[0067] The present invention uses multiple consecutive cycles of stable operation as the basis for determining whether compressor 1 has reached steady state. This prevents fan speed misadjustments caused by transient load fluctuations, enhances the system's anti-interference capabilities, and improves control stability. It also prevents improper fan startup and shutdown, which can affect equipment life. It also reduces noise and improves the user experience.

[0068] As an embodiment, in order to improve the stability of system operation and avoid an improper reduction in the speed of the condensing fan 12, which affects the heat dissipation effect, in step S6, when the operating frequency of the compressor 1 is consistent for multiple consecutive operating cycles, it is determined whether the operating time of the last cycle is ≥3 hours;

[0069] If the running time of the last cycle is ≥3 hours, then execute the subsequent steps;

[0070] If the running time of the last cycle is less than 3 hours, the process returns to step S4.

[0071] See also Figure 1 The present invention also provides a refrigeration system for executing the dual-frequency conversion control method, comprising a compressor 1, a condenser 11, a throttling device and an evaporator 13 connected in a cycle in sequence; a condensing fan 12 is provided on one side of the condenser 11;

[0072] Optionally, the throttling device is a capillary tube 14 or a throttle valve.

[0073] See also Figure 2 , the present invention also provides a refrigeration device, comprising a box body 2, wherein the box body 2 is provided with the refrigeration system;

[0074] As an embodiment, a compressor chamber 21 is provided on the lower side of the box body 2, and the compressor 1, condenser 11 and condensing fan 12 are all arranged in the compressor chamber 21. The heat generated by the compressor 1 and the condenser 11 can be discharged through the condensing fan 12.

[0075] Different operating conditions of the refrigeration system correspond to different energy consumption of the compressor 1 and heat dissipation of the condenser 11. The condensing fan 12 of the present invention adjusts its speed according to the different operating conditions of the refrigeration system, adapting to the heat dissipation requirements of the equipment. This ensures heat dissipation efficiency and maintains stable operation of the equipment while reducing overall energy consumption and noise generated during operation.

[0076] As an embodiment, the refrigeration device of the invention is a refrigerator or a freezer.

[0077] In summary, the present invention provides a dual-frequency control method, which adjusts the operating frequency of the compressor in the next operating cycle by the start-up rate of two adjacent operating cycles. The function of changing the compressor frequency according to the refrigeration needs is realized, thereby reducing the operating energy consumption. The operating voltage of the condensing fan is adjusted according to the start-up rate of the compressor after it reaches a steady state. The speed of the condensing fan is matched with the refrigeration working conditions, reducing the operating energy consumption while ensuring the heat dissipation capacity. The present invention uses stable operation of multiple consecutive cycles as the basis for judging whether the compressor has reached a steady state. It avoids the misadjustment of the fan speed caused by instantaneous load fluctuations, enhances the anti-interference ability of the system, and improves the stability of the control. It avoids the impact of improper start and stop of the fan on the life of the equipment. At the same time, it reduces noise and improves the user experience. The present invention also provides a refrigeration system and refrigeration equipment.

[0078] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A dual frequency conversion control method, characterized in that: The steps include: S1, first power on; The compressor runs at a predetermined frequency, and the frequency of the compressor increases by 10HZ at regular intervals. S2, when the refrigeration temperature reaches the preset temperature, the compressor stops; and the operating frequency at the time of shutdown is recorded; In step S3, the compressor is started again and operates at the shutdown frequency of the compressor in step S2; when the refrigeration temperature reaches the preset temperature, the compressor is shut down; and the startup rate of the compressor in this operation cycle is recorded; S4, the compressor starts again; The operating frequency of the compressor in the previous operating cycle is used as the reference frequency; Then, the operating frequency of the compressor in this cycle is determined based on the startup rate of the compressor in the previous operating cycle; The compressor runs at the determined frequency until the refrigeration temperature reaches the preset temperature and then stops. The compressor start-up rate of this operating cycle is recorded. The method for determining the compressor operating frequency of this cycle is shown in the following table: S5, the compressor operates for multiple cycles in the manner of step S4; S6: When the operating frequency of the compressor is consistent for multiple consecutive operating cycles, the operating rate of the compressor in the last cycle is used as the base operating rate; S7, determining the operating voltage of the condensing fan based on the baseline on-time rate in step S6 and the initial voltage of the condensing fan; The method for determining the operating voltage of the condensing fan is shown in the following table: S8, repeat steps S4-S7.

2. The dual frequency conversion control method according to claim 1, wherein: In the step S1, the operating frequency of the compressor when it is first started is 80 Hz.

3. The dual frequency conversion control method according to claim 1, wherein: In the step S1, the operating frequency of the compressor increases by 10 Hz every 5 minutes; the upper limit of the operating frequency of the compressor is 140 Hz.

4. The dual-frequency conversion control method according to claim 1, wherein: The number of the continuous multiple operation cycles of step S6 is 2-4.

5. The dual-frequency conversion control method according to claim 4, wherein: The number of the multiple consecutive operation cycles of step S6 is 3.

6. The dual-frequency conversion control method according to claim 1, wherein: In step S6, when the operating frequency of the compressor is consistent for multiple consecutive operating cycles, it is determined whether the operating time of the last cycle is ≥ 3 hours; If the running time of the last cycle is ≥3 hours, then execute the subsequent steps; If the running time of the last cycle is less than 3 hours, the process returns to step S4.

7. A refrigeration system for executing the dual-frequency conversion control method according to any one of claims 1 to 6, characterized in that: The utility model comprises a compressor, a condenser, a throttling device and an evaporator which are connected in a circular manner in sequence; and the condensing fan is provided on one side of the condenser.

8. A refrigeration device, characterized in that: It comprises a box body, in which the refrigeration system according to claim 7 is arranged.

9. The refrigeration equipment according to claim 8, characterized in that A press room is provided at the lower portion of the box body, and the compressor, condenser and condensing fan are installed in the press room.

10. The refrigeration equipment according to claim 8, characterized in that The refrigeration equipment is a refrigerator or a freezer.

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