Fluorine pump starting method, control device, double-circulation refrigerating system and storage medium

Abstract

The invention provides a fluorine pump starting method, a control device, a double-circulation refrigerating system and a computer readable storage medium, which can shorten the time required for starting a fluorine pump and improve the starting success rate of the fluorine pump. The fluorine pump starting method comprises the steps of determining that a compressor auxiliary fluorine pump starting condition is met; starting a fluorine pump through assistance of a compressor; wherein the fluorine pump is started in an auxiliary mode through the compressor, the compressor is started firstly, then the fluorine pump is started, and the compressor is closed after the fluorine pump is started.

Description

Technical Field

[0001] The present application relates to but is not limited to the technical field of refrigeration systems, and specifically refers to a fluorine pump starting method, a control device, a dual-circulation refrigeration system, and a computer-readable storage medium. Background Art

[0002] Since the equipment in the computer room generates a lot of heat and is in operation all year round, it needs to be cooled all year round. In order to save energy and reduce emissions, many air conditioner manufacturers have developed computer room air conditioners that use a compressor and a fluorine pump dual-circulation refrigeration system. In the summer when the outdoor temperature is high, the compressor refrigeration mode is mainly used; in the winter when the outdoor temperature is low, the fluorine pump refrigeration mode is mainly used to achieve the purpose of energy saving and emission reduction.

[0003] Due to the huge advantage of centrifugal pumps in terms of life, the existing fluorine pump compressor dual-circulation refrigeration system of computer room air conditioners often uses centrifugal pumps as refrigerant transportation devices. However, when the inlet refrigerant of the centrifugal pump vaporizes, it is very easy for the centrifugal pump to lose its head due to the failure of liquid sealing, resulting in flow interruption; and due to the existence of the liquid storage tank, the pump inlet supercooling is low. When the environment changes extremely, it is difficult to completely avoid the flow interruption of the fluorine pump. At ultra-low temperatures, it is difficult to restart the fluorine pump after it is interrupted.

[0004] The existing technology in the industry generally involves blowing cold air for a long time before turning on the fluorine pump, which takes a long time. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a fluorine pump starting method, a control device, a dual-circulation refrigeration system and a computer-readable storage medium, which can shorten the time required for starting the fluorine pump and improve the success rate of starting the fluorine pump.

[0006] To this end, an embodiment of the present application provides a fluorine pump starting method for a dual-cycle refrigeration system, the fluorine pump starting method comprising:

[0007] Make sure the conditions for the compressor to assist in starting the fluorine pump are met;

[0008] Starting the fluorine pump with the assistance of a compressor;

[0009] Wherein, starting the fluorine pump with the assistance of a compressor includes: starting the compressor first, then starting the fluorine pump, and shutting down the compressor after the fluorine pump is started.

[0010] The fluorine pump starting method provided in the embodiment of the present application can first determine whether the condition for the compressor to assist in starting the fluorine pump is met when the fluorine pump needs to be started. When it is determined that the condition for the compressor to assist in starting the fluorine pump is met, the compressor can be used to assist in starting the fluorine pump. Since the compressor is started first, a higher pressure can be generated in the system, so that the pressure at the liquid storage tank and the inlet of the fluorine pump increases rapidly, and then the saturation temperature of the refrigerant in the liquid storage tank can be increased, and the refrigerant temperature in the liquid storage tank is prevented from being higher than the saturation temperature, which is conducive to avoiding the vaporization of the refrigerant; on this basis, the fluorine pump is started, and the compressor continues to run during the fluorine pump startup process, so that the refrigerant pressure in the liquid storage tank and at the inlet of the fluorine pump can continue to be maintained, and the refrigerant vaporization caused by the sudden drop in pressure due to the compressor shutdown during the fluorine pump startup process is avoided, which affects the startup process of the fluorine pump. The compressor is turned off after the fluorine pump startup is completed.

[0011] Compared with the solution of starting the fluorine pump by using the condensing fan to cool the refrigerant in the liquid storage tank for a long time to a level that makes it difficult for the refrigerant to vaporize during the startup process, this solution can quickly increase the pressure at the liquid storage tank and the inlet of the fluorine pump by starting the compressor to avoid refrigerant vaporization. Since the response speed of pressure in the above process is significantly faster than the response speed of temperature, this solution can shorten the time required to start the fluorine pump.

[0012] Compared with stopping the compressor and then starting the fluorine pump after it has run for a period of time, this solution allows the compressor and the fluorine pump to run together for a period of time, and then shuts down the compressor after the fluorine pump is successfully started. This can avoid the sudden shutdown of the compressor before the fluorine pump starts, resulting in a sudden drop in pressure in the system and causing refrigerant vaporization, which affects the successful starting of the fluorine pump, thereby improving the success rate of starting the fluorine pump.

[0013] Based on the above technical solution, the present application can also be improved as follows.

[0014] In an exemplary embodiment, the step of starting the compressor first and then starting the fluorine pump, and shutting down the compressor after the fluorine pump is started, comprises:

[0015] starting the compressor;

[0016] After the compressor meets the first set operating condition, starting the fluorine pump to make the fluorine pump run together with the compressor;

[0017] Based on the fluorine pump meeting the second set operating condition, the compressor is turned off.

[0018] In an exemplary embodiment, the first set operating condition includes at least one of the following:

[0019] The difference between the exhaust pressure and the suction pressure of the compressor reaches a set pressure difference range;

[0020] The operating time of the compressor reaches a first set time range.

[0021] In an exemplary embodiment, the second set operating condition includes at least one of the following:

[0022] The lift of the fluorine pump reaches the set lift range;

[0023] The operating time of the fluorine pump reaches a second set time range.

[0024] In an exemplary embodiment, before starting the fluorine pump to allow the fluorine pump to operate together with the compressor, the fluorine pump starting method further includes:

[0025] Control the speed of the condensing fan;

[0026] Based on the third set operating condition being satisfied, the step of starting the fluorine pump to operate the fluorine pump together with the compressor is performed.

[0027] In an exemplary embodiment, controlling the rotation speed of the condensing fan includes:

[0028] Before the compressor meets the first set operating condition, controlling the speed of the condensing fan to be a first set speed;

[0029] Based on the compressor satisfying a first set operating condition, the rotation speed of the condensing fan is controlled to be a second set rotation speed, and the second set rotation speed is higher than the first set rotation speed.

[0030] In an exemplary embodiment, the third set operating condition includes: the operating time of the condensing fan at the second set speed reaches a third set time range.

[0031] In an exemplary embodiment, in the step of starting the compressor, the compressor is controlled to start at a third set speed; and / or, in the step of starting the fluorine pump, the fluorine pump is controlled to start at a fourth set speed.

[0032] In an exemplary embodiment, the compressor-assisted fluorine pump starting condition includes at least one of the following:

[0033] The outdoor ambient temperature is within the set temperature range;

[0034] The fluorine pump failed to self-start.

[0035] An embodiment of the present application further provides a control device, comprising a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the fluorine pump starting method as described in any one of the above embodiments are implemented.

[0036] An embodiment of the present application also provides a dual-cycle refrigeration system, including the control device as described in the above embodiment.

[0037] An embodiment of the present application further provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the fluorine pump starting method as described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the structure of a dual-cycle refrigeration system provided in some embodiments of the present application;

[0039] Figure 2 A schematic flow chart of a fluorine pump startup method provided in some embodiments of the present application;

[0040] Figure 3 A schematic flow chart of a fluorine pump starting method provided in one embodiment of the present application;

[0041] Figure 4 A schematic flow chart of a fluorine pump starting method provided in another embodiment of the present application.

[0042] Figure 1 The parts represented by the various reference numerals are listed as follows:

[0043] 1 condenser, 2 condensing fan, 3 liquid storage tank, 4 fluorine pump, 5 second one-way valve, 6 throttling device, 7 evaporator, 8 evaporating fan, 9 first one-way valve, 10 compressor, 11 first bypass flow path, 12 second bypass flow path. DETAILED DESCRIPTION

[0044] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0045] The embodiment of the present application provides a fluorine pump starting method for a dual-circulation refrigeration system.

[0046] like Figure 1As shown, the dual-cycle refrigeration system may include: a compressor 10, a condenser 1, a liquid storage tank 3, a fluorine pump 4, a throttling device 6 and an evaporator 7 connected by pipelines to form a loop; a condensing fan 2 corresponding to the condenser 1, and an evaporating fan 8 corresponding to the evaporator 7; a first bypass flow path 11 connected in parallel with the compressor 10 and a first one-way valve 9 provided on the first bypass flow path 11; a second bypass flow path 12 connected in parallel with the fluorine pump 4 and a second one-way valve 5 provided on the second bypass flow path 12. The first one-way valve 9 is configured to be unidirectionally conducted in the direction from the outlet of the evaporator 7 to the inlet of the condenser 1. The second one-way valve 5 is configured to be unidirectionally conducted in the direction from the outlet of the condenser 1 to the inlet of the evaporator 7. A liquid storage tank 3 may also be provided between the outlet of the condenser 1 and the fluorine pump 4. The evaporator 7 and the evaporating fan 8 are located on the indoor side, and the condenser 1 and the condensing fan 2 are located on the outdoor side. The throttling device 6 may be, but is not limited to, an electronic expansion valve.

[0047] The dual-cycle refrigeration system can be set to have the following three refrigeration modes: compressor refrigeration mode, mixed refrigeration mode, and fluorine pump refrigeration mode. The working principles of each refrigeration mode are as follows:

[0048] Compressor refrigeration mode: the first check valve 9 is closed and the second check valve 5 is open. The refrigerant flows through the compressor 10, the condenser 1, the liquid storage tank 3, the second bypass flow path 12, the throttling device 6 and the evaporator 7 in sequence to form a first circulation loop. In this refrigeration mode, the fluorine pump 4 is stopped and the compressor 10 is started to provide power for the refrigeration operation of the system.

[0049] Mixed refrigeration mode: the first check valve 9 is closed, and the second check valve 5 is closed. The refrigerant flows through the compressor 10, the condenser 1, the liquid storage tank 3, the fluorine pump 4, the throttling device 6 and the evaporator 7 in sequence to form a second circulation loop. In this refrigeration mode, the fluorine pump 4 and the compressor 10 are both started, and the outdoor natural cold source is partially used. The fluorine pump 4 can compensate for the circulation power of the refrigerant in the system, reduce the pressure loss of the refrigerant during the circulation process, make the compressor 10 work under the best working condition, reduce the energy consumption of the compressor 10, improve the refrigeration efficiency, and have a certain energy-saving effect.

[0050] Fluorine pump refrigeration mode: the first one-way valve 9 is turned on, and the second one-way valve 5 is turned off. Figure 1 As shown, the refrigerant flows through the first bypass flow path 11, the condenser 1, the liquid storage tank 3, the fluorine pump 4, the throttling device 6 and the evaporator 7 in sequence to form a third circulation loop. In this refrigeration mode, the fluorine pump 4 is started and the compressor 10 is stopped, making full use of the outdoor natural cold source, and using the fluorine pump 4 instead of the compressor 10 to provide power for the system cycle. Since the power of the fluorine pump 4 is much smaller than that of the compressor 10, it can significantly reduce the power consumption of the computer room air conditioner, which has a significant energy-saving effect.

[0051] The study found that the reason for the vaporization of the refrigerant is that in the fluorine pump refrigeration mode, the liquid storage tank 3 is not filled, and the refrigerant is in a saturated state at the gas-liquid interface. The refrigerant temperature is equal to the saturation temperature under the corresponding pressure. When the refrigerant pressure upstream of the fluorine pump drops rapidly (such as the condensing pressure drops due to the rapid opening of the condensing fan), the saturation temperature corresponding to the refrigerant in the liquid storage tank 3 also drops rapidly; but the temperature drop rate in the liquid storage tank 3 is significantly lower than the pressure drop rate, causing the refrigerant in the liquid storage tank 3 to become a state with a temperature higher than the saturation temperature, thereby evaporating to produce gas-liquid two-phases.

[0052] In the related art, the purpose of blowing cold air for a long time is to reduce the refrigerant temperature of the liquid storage tank 3 through long-term heat exchange, so that the refrigerant temperature of the liquid storage tank 3 is lower than the saturation temperature corresponding to the rapid drop in pressure during the startup of the fluorine pump, thereby avoiding the vaporization of the refrigerant and enabling the fluorine pump 4 to start; or after the fluorine pump has been cut off due to vaporization, by blowing cold air for a long time, the gas-liquid two-phase refrigerant in the liquid storage tank 3 is fully cooled and returned to the saturated state, so that the fluorine pump 4 can be started, but the time required to start the fluorine pump 4 is relatively long.

[0053] In some embodiments of the present application, Figure 2 As shown, the fluorine pump startup method includes:

[0054] Step S202: Determine that the condition for the compressor to assist in starting the fluorine pump is met;

[0055] Step S204: starting the fluorine pump with the assistance of the compressor, wherein starting the fluorine pump with the assistance of the compressor includes: starting the compressor first, then starting the fluorine pump, and shutting down the compressor after the fluorine pump is started.

[0056] The fluorine pump starting method provided in the embodiment of the present application can first determine whether the condition for the compressor to assist in starting the fluorine pump is met when the fluorine pump 4 needs to be started, that is, it is confirmed that the fluorine pump needs to be started (for example, a fluorine pump start instruction is received or a fluorine pump interruption is detected). When it is determined that the condition for the compressor to assist in starting the fluorine pump is met, the compressor 10 can be used to assist in starting the fluorine pump 4. Since the compressor 10 is started first, a higher pressure can be generated in the system, so that the pressure at the inlet of the liquid storage tank 3 and the fluorine pump 4 increases rapidly, and then the saturation temperature of the refrigerant in the liquid storage tank 3 can be increased, and the refrigerant temperature in the liquid storage tank 3 is prevented from being higher than the saturation temperature, which is conducive to avoiding the vaporization of the refrigerant; on this basis, the fluorine pump 4 is started, and the compressor 10 continues to run during the startup process of the fluorine pump 4, so that the refrigerant pressure in the liquid storage tank 3 and at the inlet of the fluorine pump 4 can continue to be maintained, avoiding the refrigerant vaporization caused by the sudden decrease in pressure due to the shutdown of the compressor 10 during the startup process of the fluorine pump 4, which affects the startup process of the fluorine pump 4. After the startup of the fluorine pump 4 is completed, the compressor 10 is turned off.

[0057] Compared with the solution of starting the fluorine pump 4 after blowing cold air for a long time, this solution can quickly increase the pressure at the inlet of the liquid storage tank 3 and the fluorine pump 4 by starting the compressor 10 to avoid refrigerant vaporization. Since the response speed of pressure is significantly faster than the response speed of temperature, this solution can shorten the time required to start the fluorine pump 4.

[0058] Compared with stopping the compressor 10 after running for a period of time and then starting the fluorine pump 4, this solution allows the compressor 10 and the fluorine pump 4 to run together for a period of time, and then shuts down the compressor 10 after the fluorine pump 4 is successfully started. This can avoid the sudden shutdown of the compressor 10 before the fluorine pump 4 is started, resulting in a sudden drop in pressure in the system and causing vaporization of the refrigerant, which affects the successful starting of the fluorine pump 4, thereby improving the success rate of starting the fluorine pump 4.

[0059] Among them, the fluorine pump starting method provided in the embodiment of the present application can be used for starting the fluorine pump 4 after the flow is cut off, and can also be used for starting the fluorine pump 4 when it is turned on normally. For example, it can be used for restarting due to the cut-off of the fluorine pump during the operation of the fluorine pump refrigeration mode, and can also be used for starting the fluorine pump when the fluorine pump refrigeration mode is turned on. Therefore, judging whether the condition for the compressor to assist in starting the fluorine pump is met can be based on determining that the fluorine pump is cut off in the fluorine pump refrigeration mode, or it can be based on receiving a fluorine pump start instruction. As long as the condition for the compressor to assist in starting the fluorine pump is met when the fluorine pump 4 needs to be started, the compressor 10 can be used to assist in starting the fluorine pump 4, so that the fluorine pump 4 can be started quickly and successfully. When the condition for the compressor to assist in starting the fluorine pump is not met, the fluorine pump 4 can be started by self-starting.

[0060] As for the self-starting mode of the fluorine pump 4, it can be a conventional starting mode of the fluorine pump 4. For example, the fluorine pump 4 is started directly when the machine is turned on; or, after the fluorine pump 4 is cut off, the condensing fan 2 runs for a period of time, and then the fluorine pump 4 is started.

[0061] In some exemplary embodiments, the compressor-assisted starting condition of the fluorine pump includes at least one of the following: the outdoor ambient temperature is within a set temperature range; the fluorine pump 4 fails to start automatically.

[0062] In other words, when the outdoor ambient temperature is within the set range, the compressor 10 can assist in starting the fluorine pump 4. When the fluorine pump 4 fails to start automatically, the compressor 10 can also assist in starting the fluorine pump 4. When the outdoor ambient temperature is within the set range and the fluorine pump 4 fails to start automatically, the compressor 10 can assist in starting the fluorine pump 4.

[0063] The set temperature range may be, but is not limited to, less than or equal to the preset temperature. The outdoor ambient temperature may be recorded as Th, the preset temperature may be recorded as Th_s, and the condition for the compressor to assist in starting the fluorine pump may be: Th≤Th_s. The preset temperature may be reasonably set as required, and may be, but is not limited to, in the range of -30°C to 0°C, such as -30°C, -25°C, -20°C, -15°C, -10°C, -5°C, 0°C, etc.

[0064] Since it is difficult to restart the fluorine pump 4 after the flow is cut off under ultra-low temperature conditions, the compressor 10 can be used to assist in starting the fluorine pump 4 to improve the success rate of starting the fluorine pump 4 and shorten the time required for starting the fluorine pump 4.

[0065] When the fluorine pump 4 fails to start in a normal self-starting mode, it indicates that the fluorine pump 4 is difficult to start normally. At this time, the compressor 10 can also be used to assist in starting the fluorine pump 4, thereby improving the success rate of starting the fluorine pump 4, and the required time is shorter.

[0066] Regarding the compressor-assisted starting conditions of the fluorine pump: the above conditions can be used individually, or combined and used in an "or" manner, or combined and used in an "and" manner.

[0067] In some exemplary embodiments, starting the compressor 10 first, then starting the fluorine pump 4, and shutting down the compressor 10 after the fluorine pump 4 is started, comprises:

[0068] Start the compressor 10;

[0069] After the compressor 10 meets the first set operating condition, the fluorine pump 4 is started, so that the fluorine pump 4 and the compressor 10 operate together;

[0070] Based on the fact that the fluorine pump 4 satisfies the second set operating condition, the compressor 10 is turned off.

[0071] When the compressor 10 meets the first set operating condition, it indicates that a certain pressure difference has been established between the inlet and outlet of the compressor 10, so the refrigerant pressure in the liquid storage tank 3 and at the inlet of the fluorine pump 4 can meet the requirements, and will not cause the refrigerant to vaporize and affect the start of the fluorine pump 4. Therefore, the fluorine pump 4 can be started and the fluorine pump 4 and the compressor 10 can be operated together.

[0072] When the fluorine pump 4 meets the second set operating condition, it indicates that the fluorine pump 4 has been successfully started and is running stably, and there will be no interruption of flow due to the shutdown of the compressor 10. Therefore, the compressor 10 can be shut down at this time, and the shutdown of the compressor 10 will not affect the normal operation of the fluorine pump 4.

[0073] In some examples, the first set operating condition includes: the difference between the discharge pressure and the suction pressure of the compressor 10 reaches a set pressure difference range.

[0074] When the difference between the exhaust pressure and the suction pressure of the compressor 10 reaches the set pressure difference range, it indicates that a certain pressure difference has been established between the inlet and outlet of the compressor 10, and the pressure at the inlet of the liquid storage tank 3 and the fluorine pump 4 can meet the requirements, and will not cause the refrigerant to vaporize and affect the start-up of the fluorine pump 4. Since this solution can directly indicate that the system pressure meets the requirements, it has a high accuracy.

[0075] Among them, the difference between the exhaust pressure and the suction pressure of the compressor 10 is recorded as △P, and the set pressure difference range can be: greater than the preset pressure difference, the preset pressure difference can be recorded as △P_s, then the first set operating condition can be: △P>△P_s, △P_s can be reasonably set as needed, and can be in the range of 0.2MPa to 0.5MPa, such as 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, etc.

[0076] In some other examples, the first set operating condition includes: the operating time of the compressor 10 reaches a first set time range.

[0077] In other words, the difference ΔP between the exhaust pressure and the suction pressure of the compressor 10 is not used as the basis for judging whether the compressor 10 meets the first set operating condition, but the running time of the compressor 10 is used as the basis for judging. Since there is a corresponding relationship between the running time of the compressor 10 and ΔP, when the running time of the compressor 10 reaches the first set time range, the difference ΔP between the exhaust pressure and the suction pressure of the compressor 10 can generally reach the set pressure difference range. Therefore, the running time of the compressor 10 can also be used as the basis for judging whether the compressor 10 meets the first set operating condition, and the control logic is simpler.

[0078] Among them, the operating time of the compressor 10 can be recorded as ty, the first set time range can be: greater than or equal to the first set time, the first set time can be recorded as t1, and the first set operating condition can be: ty≥t1, t1 can be reasonably set as needed, and can be in the range of but not limited to 10s to 120s, such as 10s, 30s, 60s, 90s, 120s, etc.

[0079] In other examples, the first set operating condition may also be: ΔP>ΔP_s and ty≥t1. Alternatively, the first set operating condition may also be: ΔP>ΔP_s or ty≥t1.

[0080] In other words, for the first set operating condition: the conditions in the above examples can be used individually, combined and used in an "or" manner, or combined and used in an "and" manner.

[0081] In some examples, the second set operating condition includes: the head of the fluorine pump 4 reaches a set head range.

[0082] When the lift of the fluorine pump 4 reaches the set lift range, it indicates that the fluorine pump 4 has been running stably and is not prone to loss of lift and flow interruption. Therefore, the compressor 10 can be turned off, and the closing of the compressor 10 will not affect the normal operation of the fluorine pump 4.

[0083] Among them, the head of the fluorine pump 4 can be recorded as △H, and the set head range can be: greater than the preset head, the preset head can be recorded as △H_s, and the second set operating condition can be: △H>△H_s, △H_s can be reasonably set according to needs, and can be in the range of 150KPa to 500KPa, such as 150KPa, 200KPa, 300KPa, 400KPa, 500KPa, etc.

[0084] In some other examples, the second set operating condition includes: the operating time of the fluorine pump 4 reaches a second set time range.

[0085] In other words, the head of the fluorine pump 4 is not used as the basis for judging whether the fluorine pump 4 meets the second set operating condition, but the running time of the fluorine pump 4 is used as the basis for judging. Since there is a corresponding relationship between the running time of the fluorine pump 4 and △H, when the running time of the fluorine pump 4 is within the second set time range, the head △H of the fluorine pump 4 can generally reach the set head range. Therefore, the running time of the fluorine pump 4 can also be used as the basis for judging whether the fluorine pump 4 meets the second set operating condition, and the control logic is simpler.

[0086] Among them, the operating time of the fluorine pump 4 can be recorded as tf, the second set time range can be: greater than or equal to the second set time, the second set time can be recorded as t2, and the second set operating condition can be: tf≥t2, t2 can be reasonably set as needed, and can be in the range of but not limited to 10s to 120s, such as 10s, 30s, 60s, 90s, 120s, etc.

[0087] In other examples, the second set operating condition may also be: ΔH>ΔH_s and tf≥t2. Alternatively, the second set operating condition may also be: ΔH>ΔH_s or tf≥t2.

[0088] In other words, for the second set operating condition: the conditions in the above examples can be used individually, combined and used in an "or" manner, or combined and used in an "and" manner.

[0089] In some exemplary embodiments, before starting the fluorine pump 4 and making the fluorine pump 4 run together with the compressor 10, the fluorine pump starting method further includes:

[0090] Control the speed of condensing fan 2;

[0091] Based on the third set operating condition being satisfied, a step of starting the fluorine pump 4 and operating the fluorine pump 4 together with the compressor 10 is executed.

[0092] The speed of the condensing fan 2 will affect the condensing pressure of the condenser 1, and further affect the refrigerant pressure in the liquid storage tank 3 and the refrigerant pressure at the inlet of the fluorine pump 4. The speed of the condensing fan 2 is negatively correlated with the pressure at the inlet of the fluorine pump 4. The higher the speed of the condensing fan 2, the lower the condensing pressure of the condenser 1, the refrigerant pressure in the liquid storage tank 3 and the refrigerant pressure at the inlet of the fluorine pump 4, which may have an adverse effect on the start-up of the fluorine pump 4. However, in order to ensure cooling efficiency, the condensing fan 2 needs to be turned on in the fluorine pump refrigeration mode.

[0093] Therefore, in order to prevent the start of the condensing fan 2 from affecting the normal start-up of the fluorine pump 4, the present scheme controls the rotation speed of the condensing fan 2 before the start-up of the fluorine pump 4. The adverse effects of the condensing fan 2 can be overcome by the operation of the compressor 10, thereby ensuring the subsequent normal start-up and normal operation of the fluorine pump 4 and avoiding the situation where the condensing fan 2 is started only after the fluorine pump 4 is started, causing the fluorine pump 4 to be interrupted.

[0094] When the third set operating condition is met, it indicates that the operation of the condensing fan 2 will not affect the starting of the fluorine pump 4, so the fluorine pump 4 can be started and the fluorine pump 4 and the compressor 10 can be operated together.

[0095] In some exemplary embodiments, controlling the rotation speed of the condensing fan 2 includes:

[0096] Before the compressor 10 meets the first set operating condition, the speed of the condensing fan 2 is controlled to be the first set speed;

[0097] Based on the compressor 10 satisfying the first set operating condition, the rotation speed of the condensing fan 2 is controlled to be a second set rotation speed.

[0098] The second set speed is higher than the first set speed.

[0099] Since the fluorine pump refrigeration mode usually works under the condition of low outdoor ambient temperature, the condensing pressure of the condenser 1 will also affect the start-up of the compressor 10. When the condensing pressure of the condenser 1 is too low, it will be difficult to establish a pressure difference between the inlet and outlet of the compressor 10, resulting in difficulty in starting the compressor 10. Therefore, before the compressor 10 meets the first set operating condition, that is, during the start-up of the compressor 10, the speed of the condensing fan 2 is controlled to be relatively low (the first set speed can be 0, or a low speed higher than 0, such as the minimum speed of the condensing fan 2), which can avoid the condensing pressure in the condenser 1 being too low, resulting in the inlet and outlet of the condenser 1 being difficult to establish a pressure difference, that is, the suction and exhaust pressure difference has been established, which is conducive to the rapid start-up of the compressor 10. Among them, controlling the speed of the condensing fan to the first set speed can be an increase in the speed, a decrease in the speed, or a constant speed, depending on the current speed of the condensing fan 2 before executing this step. If the condensing fan 2 is in operation and the speed is greater than the first set speed before executing this step, this step will cause the speed of the condensing fan 2 to decrease. If the condensing fan 2 is in operation and its speed is equal to the first set speed before executing this step, this step will cause the speed of the condensing fan 2 to remain unchanged. If the condensing fan 2 is in shutdown or in operation and its speed is lower than the first set speed before executing this step, this step will cause the speed of the condensing fan 2 to increase.

[0100] When the compressor 10 meets the first set operating condition, it indicates that the compressor 10 has been successfully started and the suction and exhaust pressure difference has been established. At this time, the speed of the condensing fan 2 can be controlled to increase, which will not cause too much impact on the refrigerant pressure at the inlet of the liquid storage tank 3 and the fluorine pump 4. Therefore, the fluorine pump 4 can be started normally and run stably after the compressor 10 is turned off. When the first set speed is 0, the second set speed can be the minimum speed of the condensing fan 2. When the first set speed is a low speed higher than 0 (such as the minimum speed of the condensing fan 2), the second set speed can be greater than the minimum speed of the condensing fan 2.

[0101] In some exemplary embodiments, the third set operating condition includes: the operating time of the condensing fan 2 at the second set speed reaches a third set time range.

[0102] Among them, the operating time of the condensing fan 2 can be recorded as tl, and the third set time range can be: greater than or equal to the third set time, the third set time can be recorded as t3, and the third set operating condition can be: tl≥t3, t3 can be reasonably set according to needs, and can be in the range of but not limited to 10s to 120s, such as 10s, 30s, 60s, 90s, 120s, etc.

[0103] In some exemplary embodiments, in the step of starting the compressor 10, the compressor 10 is controlled to start at a third set speed. The third set speed may be the lowest speed of the compressor 10, or a low speed greater than the lowest speed of the compressor 10.

[0104] This is beneficial for the quick and stable startup of the compressor 10 and can reduce energy consumption on the basis of meeting the startup requirements of the fluorine pump 4 .

[0105] In some exemplary embodiments, in the step of starting the fluorine pump 4, the fluorine pump 4 is controlled to start at a fourth set speed. The fourth set speed can be the lowest speed of the fluorine pump 4, or a low speed greater than the lowest speed of the fluorine pump 4.

[0106] In this way, the fluorine pump 4 can be started at a low speed first, and then switched to high speed rotation after the compressor 10 is turned off. This is conducive to the fluorine pump 4 being able to start smoothly and gradually reach a normal operating state. Starting at a low speed can reduce the impact and pressure changes during startup, thereby improving the safety and reliability of the equipment.

[0107] In some exemplary embodiments, the fluorine pump starting method further includes: controlling the evaporation fan 8 to operate at a fifth set speed during the process of assisting the fluorine pump 4 with the compressor 10. The fifth set speed is a relatively high speed and can be the rated speed of the evaporation fan 8.

[0108] When the compressor 10 assists in starting the fluorine pump 4 , the evaporating fan 8 runs at the fifth set speed, which can accelerate the evaporation of the refrigerant in the evaporator 7 and facilitate the quick start of the compressor 10 .

[0109] In some exemplary embodiments, the fluorine pump starting method further includes: in the process of starting the fluorine pump 4 with the assistance of the compressor 10 , controlling the throttling device 6 to be in a fully open state.

[0110] The throttling device 6 is kept in a fully open state, which can reduce the resistance generated by the throttling device 6 to the start-up of the fluorine pump 4.

[0111] When the compressor 10 is turned off, the working parameters of the fluorine pump 4, the condensing fan 2 and the evaporating fan 8 are freely adjusted according to the fluorine pump refrigeration mode.

[0112] In one embodiment, Figure 3 As shown, the fluorine pump starting method includes the following steps:

[0113] Step S302: Detecting that the fluorine pump is disconnected.

[0114] Step S304: Determine whether Th>Th_s is established. That is, determine whether the outdoor environment temperature Th is greater than the preset temperature Th_s. If not, execute step S306; if so, execute step S318.

[0115] Step S306: starting the compressor at the third set speed, and controlling the condensing fan speed to be the first set speed.

[0116] Step S308: Determine whether ΔP>ΔP_s holds; if so, execute step S310; if not, return to execute step S308.

[0117] Step S310: Control the rotation speed of the condensing fan to a second set rotation speed, where the second set rotation speed is greater than the first set rotation speed.

[0118] Step S312: After the condensing fan runs at the second set speed for a third set time, the fluorine pump is started at the fourth set speed.

[0119] Step S314: Determine whether △H>△H_s holds; if so, execute step S316; if not, return to execute step S314.

[0120] Step S316: Turn off the compressor.

[0121] Step S318: Start the fluorine pump in a self-starting mode.

[0122] In another embodiment, Figure 4 As shown, the fluorine pump starting method includes the following steps:

[0123] Step S402: Detecting that the fluorine pump is disconnected.

[0124] Step S404: Determine whether Th>Th_s is established. That is, determine whether the outdoor environment temperature Th is greater than the preset temperature Th_s. If not, execute step S406; if so, execute step S420.

[0125] Step S406: starting the compressor at the third set speed, and controlling the condensing fan speed to the first set speed.

[0126] Step S408: After the compressor runs for the first set time, the speed of the condensing fan is controlled to be a second set speed.

[0127] Step S410: After the condensing fan runs at the second set speed for a third set time, the fluorine pump is started at the fourth set speed.

[0128] Step S412: After the fluorine pump runs for a second set time, the compressor is turned off.

[0129] Step S414: Start the fluorine pump in a self-starting mode.

[0130] The embodiment of the present application also provides a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, the steps of the fluorine pump starting method as described in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0131] The processor may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0132] The embodiment of the present application also provides a dual-circulation refrigeration system, including the control device as described in the above embodiment, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0133] The embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the fluorine pump starting method as described in any one of the above embodiments is implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0134] In summary, the fluorine pump starting method, control device, dual-cycle refrigeration system and computer-readable storage medium provided in the embodiments of the present application use an auxiliary starting method in which the compressor runs first, the fluorine pump runs simultaneously, and then the compressor is turned off to start the fluorine pump. This auxiliary starting method has the advantages of high starting success rate and fast speed.

[0135] Specifically, the compressor can be started at the lowest speed first, at which time the condensing fan is turned off. The condensing fan will not be started until a certain pressure difference is established between the compressor's suction and exhaust gases, and the condensing fan will be controlled to run at the minimum speed. After the condensing fan has been turned on for a certain period of time, the fluorine pump is turned on at the lowest speed, and the compressor is turned off after the fluorine pump builds a certain head.

[0136] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0137] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0138] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0139] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0140] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0141] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0142] In any one or more of the above exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or codes, and executed by a hardware-based processing unit. A computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium that facilitates the transmission of a computer program from one place to another, such as according to a communication protocol. In this way, a computer-readable medium may generally correspond to a non-temporary tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the technology described in the present disclosure. A computer program product may include a computer-readable medium.

[0143] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient (transient) media, but are directed to non-transient tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks, or Blu-ray disks, etc., where disks typically reproduce data magnetically, while optical disks use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0144] For example, instructions may be executed by one or more processors such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Thus, the term "processor" as used herein may refer to any of the above structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functionality described herein may be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques may be fully implemented in one or more circuits or logic elements.

[0145] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs) or a group of ICs (e.g., chipsets). Various components, modules or units are described in the embodiments of the present disclosure to emphasize the functional aspects of the devices configured to perform the described techniques, but they do not necessarily need to be implemented by different hardware units. Instead, as described above, the various units can be combined in a codec hardware unit or provided by a collection of interoperable hardware units (including one or more processors as described above) in combination with suitable software and / or firmware.

Claims

1. A fluorine pump starting method for a dual-cycle refrigeration system, characterized in that: The fluorine pump starting method comprises: Make sure the conditions for the compressor to assist in starting the fluorine pump are met; Starting the fluorine pump with the assistance of a compressor; Wherein, starting the fluorine pump with the assistance of a compressor includes: starting the compressor first, then starting the fluorine pump, and shutting down the compressor after the fluorine pump is started.

2. The fluorine pump starting method according to claim 1, characterized in that: The method of starting the compressor first and then starting the fluorine pump, and shutting down the compressor after the fluorine pump is started, comprises: starting the compressor; After the compressor meets the first set operating condition, starting the fluorine pump to make the fluorine pump run together with the compressor; Based on the fluorine pump meeting the second set operating condition, the compressor is turned off.

3. The fluorine pump starting method according to claim 2, characterized in that: The first set operating condition includes at least one of the following: The difference between the exhaust pressure and the suction pressure of the compressor reaches a set pressure difference range; The operating time of the compressor reaches a first set time range.

4. The fluorine pump starting method according to claim 2, characterized in that: The second set operating condition includes at least one of the following: The lift of the fluorine pump reaches the set lift range; The operating time of the fluorine pump reaches a second set time range.

5. The fluorine pump starting method according to any one of claims 2 to 4, characterized in that: Before starting the fluorine pump to make it run together with the compressor, the fluorine pump starting method further includes: Control the speed of the condensing fan; Based on the third set operating condition being satisfied, the step of starting the fluorine pump to operate the fluorine pump together with the compressor is performed.

6. The fluorine pump starting method according to claim 5, characterized in that: The controlling the rotation speed of the condensing fan comprises: Before the compressor meets the first set operating condition, controlling the speed of the condensing fan to be a first set speed; Based on the compressor satisfying a first set operating condition, the rotation speed of the condensing fan is controlled to be a second set rotation speed, and the second set rotation speed is higher than the first set rotation speed.

7. The fluorine pump starting method according to claim 6, characterized in that: The third set operating condition includes: the operating time of the condensing fan at the second set speed reaches a third set time range.

8. The fluorine pump starting method according to any one of claims 2 to 4, characterized in that: In the step of starting the compressor, controlling the compressor to start at a third set speed; and / or In the step of starting the fluorine pump, the fluorine pump is controlled to start at a fourth set rotation speed.

9. The fluorine pump starting method according to any one of claims 1 to 4, characterized in that: The compressor-assisted fluorine pump starting condition includes at least one of the following: The outdoor ambient temperature is within the set temperature range; The fluorine pump failed to self-start.

10. A control device, characterized in that: The invention comprises a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the fluorine pump starting method as claimed in any one of claims 1 to 9 are implemented.

11. A dual-cycle refrigeration system, characterized in that: Comprising the control device as claimed in claim 10.

12. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the fluorine pump starting method according to any one of claims 1 to 9 is implemented.

Images