Refrigeration equipment and its dual gas supply regulation method and device

Abstract

This application relates to a refrigeration equipment and its dual-stage gas supply regulation method and apparatus. The method includes: acquiring the exhaust superheat and terminal temperature difference of the refrigeration equipment, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensing temperature of the refrigeration equipment, and the terminal temperature difference is the difference between the chilled water outlet temperature and the saturated evaporating temperature of the refrigeration equipment; when the terminal temperature difference is greater than or equal to a first threshold, controlling a first gas supply electric valve and a second gas supply electric valve of the refrigeration equipment according to the temperature range of the exhaust superheat, wherein the first gas supply electric valve is configured at the connection between the condenser and the flash evaporator of the refrigeration equipment, and the second gas supply electric valve is configured at the connection between the condenser and the suction port of the refrigeration equipment. This application solves the technical problem of unstable unit operation during control of a dual-stage gas supply structure.

Description

Technical Field

[0001] This application relates to the field of refrigeration, and in particular to a refrigeration device and its dual-gas-supply regulation method and apparatus. Background Technology

[0002] Refrigeration systems typically utilize external energy to transfer heat from a lower-temperature substance (or environment) to a higher-temperature substance (or environment). The compressor is a key component in the refrigeration system, commonly used to compress low-pressure gases into higher-pressure gases, reducing gas volume and increasing pressure, thus converting external mechanical energy into gas pressure energy. To ensure the normal operation of the refrigeration system, the unit's capacity output needs to be adjusted according to the user's load, achieving on-demand supply and energy-efficient, reliable operation. Conventional gas replenishment control methods often lead to frequent opening and closing of solenoid valves or electric butterfly valves, frequently resulting in over-adjustment of these valves. This leads to frequent loading and unloading of the unit, hindering stable and energy-efficient operation. Using this control approach to control the opening and closing of solenoid valves or electric butterfly valves can cause excessively high or low intake superheat oscillations during actual use, resulting in poor system tracking of the solenoid valves or electric butterfly valves, ineffective superheat control, and negatively impacting overall unit performance, creating a control blind spot. Summary of the Invention

[0003] This application provides a refrigeration equipment and its dual-gas-supply regulation method and device to solve the technical problem that the unit operation is difficult to stabilize when the dual-stage gas-supply structure is under control.

[0004] In a first aspect, this application provides a dual-gas-replenishment regulation method, comprising: acquiring the exhaust superheat and end temperature difference of a refrigeration device, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature of the refrigeration device, and the end temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration device; when the end temperature difference is greater than or equal to a first threshold, controlling a first gas-replenishment electric valve and a second gas-replenishment electric valve of the refrigeration device according to the temperature range of the exhaust superheat, wherein the first gas-replenishment electric valve is configured at the connection between the condenser and the flash evaporator of the refrigeration device, and the second gas-replenishment electric valve is configured at the connection between the condenser and the suction port of the refrigeration device.

[0005] Secondly, this application provides a dual-gas-replenishment regulating device, comprising: a first acquisition module, configured to acquire the exhaust superheat and end temperature difference of a refrigeration device, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature of the refrigeration device, and the end temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration device; and a first control module, configured to control a first gas-replenishment electric valve and a second gas-replenishment electric valve of the refrigeration device according to the temperature range of the exhaust superheat when the end temperature difference is greater than or equal to a first threshold, wherein the first gas-replenishment electric valve is configured at the connection between the condenser and the flash evaporator of the refrigeration device, and the second gas-replenishment electric valve is configured at the connection between the condenser and the suction port of the refrigeration device.

[0006] As an optional example, the first acquisition module includes: a first acquisition unit for acquiring the refrigerant thermal property table of the refrigeration equipment; a second acquisition unit for acquiring the condensing pressure and evaporating pressure of the refrigeration equipment; a lookup unit for looking up the saturated condensing temperature and the saturated evaporating temperature in the refrigerant thermal property table based on the condensing pressure and the evaporating pressure; a third acquisition unit for acquiring the exhaust temperature and the chilled water outlet temperature; and a calculation unit for calculating a first difference between the exhaust temperature and the saturated condensing temperature to obtain the exhaust superheat, and calculating a second difference between the chilled water outlet temperature and the saturated evaporating temperature to obtain the end temperature difference.

[0007] As an optional example, the first control module includes: a first control unit, configured to control the first replenishment electric valve and the second replenishment electric valve to open simultaneously when the exhaust superheat is within a first temperature range, wherein the first temperature range is greater than or equal to a second threshold.

[0008] As an optional example, the first control module includes: a second control unit, configured to control the first replenishment electric valve to open and the second replenishment electric valve to close when the exhaust superheat is in a second temperature range, wherein the second temperature range is less than a second threshold and greater than or equal to a third threshold.

[0009] As an optional example, the first control module includes a third control unit for controlling the second supplementary gas electric valve to close when the exhaust superheat is within a third temperature range, wherein the third temperature range is less than a third threshold and greater than or equal to a fourth threshold.

[0010] As an optional example, the first control module includes a fourth control unit for controlling the refrigeration equipment to shut down when the exhaust superheat is within a fourth temperature range, wherein the fourth temperature range is less than a fourth threshold.

[0011] As an optional example, the above-mentioned device further includes: a second acquisition module, configured to acquire the flash evaporator liquid level, a fully closed setting value, an intermediate setting value, and a fully open setting value of the refrigeration equipment, wherein the fully closed setting value is greater than the intermediate setting value, which is greater than the fully open setting value; a second control module, configured to control the first gas supply electric valve and the second gas supply electric valve to close simultaneously when the flash evaporator liquid level is higher than the fully closed setting value; a third control module, configured to control the first gas supply electric valve to open and the second gas supply electric valve to close, or control the first gas supply electric valve to close and the second gas supply electric valve to open, when the flash evaporator liquid level is higher than the intermediate setting value and lower than the fully closed setting value; and a fourth control module, configured to control the first gas supply electric valve to open and the second gas supply electric valve to close, or control the first gas supply electric valve to close and the second gas supply electric valve to open, or control the first gas supply electric valve and the second gas supply electric valve to open simultaneously, when the flash evaporator liquid level is higher than the fully open setting value and lower than the intermediate setting value.

[0012] Thirdly, this application provides a refrigeration device, comprising: an exhaust temperature sensor for acquiring the exhaust temperature of the refrigeration device; a chilled water outlet sensor for acquiring the chilled water outlet temperature of the refrigeration device; a condensing pressure sensor for acquiring the condensing pressure of the refrigeration device, wherein the condensing pressure is used to determine the saturated condensation temperature; an evaporation pressure sensor for acquiring the evaporation pressure of the refrigeration device, wherein the evaporation pressure is used to determine the saturated evaporation temperature; a first gas supply electric valve and a second gas supply electric valve for increasing the flash gas supply amount, wherein the first gas supply electric valve is disposed between the condenser and the flash evaporator of the refrigeration device, and the second gas supply electric valve is disposed between the condenser and the suction port of the refrigeration device; and a control module for determining the exhaust superheat and the end temperature difference of the refrigeration device, and, when the end temperature difference is greater than or equal to a first threshold, controlling the first gas supply electric valve and the second gas supply electric valve according to the temperature range of the exhaust superheat, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature, and the end temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration device.

[0013] As an optional example, the control module is also used to control the first gas replenishment electric valve and the second gas replenishment electric valve according to the liquid level of the flash evaporator of the refrigeration equipment. The equipment also includes a liquid level sensor for acquiring the liquid level of the flash evaporator.

[0014] Fourthly, this application provides a storage medium storing a computer program, wherein the computer program is executed by a processor to perform the above-described dual-gas-supply adjustment method.

[0015] Fifthly, this application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to execute the above-described dual-gas-replenishment regulation method through the computer program.

[0016] In this embodiment, the method employs the acquisition of exhaust superheat and terminal temperature difference of the refrigeration equipment. The exhaust superheat is the difference between the exhaust temperature and the saturated condensing temperature of the refrigeration equipment, and the terminal temperature difference is the difference between the chilled water outlet temperature and the saturated evaporating temperature of the refrigeration equipment. When the terminal temperature difference is greater than or equal to a first threshold, the first and second make-up gas electric valves of the refrigeration equipment are controlled according to the temperature range of the exhaust superheat. The first make-up gas electric valve is located between the condenser and the flash evaporator of the refrigeration equipment, and the second make-up gas electric valve is located between the condenser and the suction port of the refrigeration equipment. Because the opening and closing of the first and second make-up gas electric valves are controlled by detecting the exhaust superheat and terminal temperature difference of the refrigeration equipment, and by segmented control based on the exhaust superheat, the make-up gas valves are graded for adjustment to adapt to different load outputs. This solves the technical problem of unstable unit operation during control of a two-stage make-up gas structure. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 This is a flowchart of an optional dual-gas-injection adjustment method according to an embodiment of this application;

[0021] Figure 2 This is a flowchart illustrating the implementation of an optional dual-gas-replenishment regulation method according to an embodiment of this application.

[0022] Figure 3This is a schematic diagram of an optional dual-air-supply regulating device according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the structure of an optional refrigeration device according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of an optional electronic device according to an embodiment of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0027] According to a first aspect of the embodiments of this application, a dual-gas-replenishment regulation method is provided, optionally, as follows: Figure 1 As shown, the above method includes:

[0028] S102, obtain the exhaust superheat and terminal temperature difference of the refrigeration equipment, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature of the refrigeration equipment, and the terminal temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration equipment.

[0029] S104, when the end temperature difference is greater than or equal to the first threshold, the first and second gas supply electric valves of the refrigeration equipment are controlled according to the temperature range of the exhaust superheat. The first gas supply electric valve is configured at the condenser of the refrigeration equipment leading to the flash evaporator of the refrigeration equipment, and the second gas supply electric valve is configured at the suction port of the refrigeration equipment leading to the condenser.

[0030] Optionally, in this embodiment, after the refrigeration equipment is started, the condensing pressure Pc, evaporating pressure Pe, exhaust temperature Ta, and chilled water outlet temperature T are obtained using the unit's own condensing pressure sensor, evaporating pressure sensor, exhaust temperature sensor, and chilled water outlet sensor, respectively. The saturated condensing temperature Tc and saturated evaporating temperature Te under the corresponding refrigerant pressure state are then obtained according to the refrigerant thermophysical property table. Using these values, the exhaust superheat ΔT = Ta - Tc and the terminal temperature difference ΔTd = T - Te are calculated. The opening of the gas injection electric valve is controlled by detecting the compressor exhaust superheat. The first and second gas injection electric valves are controlled in stages according to the superheat, achieving graded adjustment of the gas injection valves to adapt to different load outputs. The first gas injection electric valve is located at the connection between the condenser and the flash evaporator of the refrigeration equipment, and the second gas injection electric valve is located at the connection between the condenser and the suction port of the refrigeration equipment. This method can adapt to the actual load requirements of the user and effectively avoid refrigeration system failures caused by compressor load imbalance.

[0031] As an optional example, obtaining the exhaust superheat and terminal temperature difference of the refrigeration equipment includes:

[0032] Obtain the refrigerant thermal property data sheet for the refrigeration equipment;

[0033] Obtain the condensing pressure and evaporating pressure of the refrigeration equipment;

[0034] Based on the condensing pressure and evaporating pressure, find the saturated condensing temperature and saturated evaporating temperature in the refrigerant thermophysical property table;

[0035] Obtain the exhaust temperature and chilled water outlet temperature;

[0036] Calculate the first difference between the exhaust temperature and the saturated condensation temperature to obtain the exhaust superheat, and calculate the second difference between the chilled water outlet temperature and the saturated evaporation temperature to obtain the end temperature difference.

[0037] Optionally, in this embodiment, the condensing pressure Pc, evaporating pressure Pe, exhaust temperature Ta, and chilled water temperature T are obtained by using the condensing pressure sensor, evaporating pressure sensor, exhaust temperature sensor, and chilled water outlet sensor configured on the unit itself. The saturated condensing temperature Tc and saturated evaporating temperature Te under the corresponding refrigerant pressure state are obtained by looking up the refrigerant thermophysical property table. The exhaust superheat ΔT = Ta - Tc and the terminal temperature difference ΔTd = T - Te are obtained by matching and calculating the above values.

[0038] As an optional example, when the terminal temperature difference is greater than or equal to a first threshold, controlling the first and second electric gas supply valves of the refrigeration equipment according to the temperature range of the exhaust superheat includes:

[0039] When the exhaust superheat is within a first temperature range, the first and second make-up air electric valves are opened simultaneously, wherein the first temperature range is greater than or equal to the second threshold.

[0040] Optionally, in this embodiment, the first threshold can be 2℃, and the first temperature range can be greater than or equal to 4℃. When the terminal temperature difference △Td≥2℃, it is determined whether the exhaust superheat △T satisfies △T≥4℃. If it does, the unit has sufficient margin to adjust the load by replenishing with liquid refrigerant, and the first and second replenishment electric valves are opened.

[0041] As an alternative example, controlling the first and second make-up gas electric valves of the refrigeration equipment based on the exhaust superheat and the terminal temperature difference includes:

[0042] When the exhaust superheat is within the second temperature range, the first replenishment electric valve is opened and the second replenishment electric valve is closed. The second temperature range is less than the second threshold and greater than or equal to the third threshold.

[0043] Optionally, in this embodiment, the second temperature range can be less than 4℃ and greater than or equal to 3℃. When the end temperature difference ΔTd ≥ 2℃, if the exhaust superheat ΔT does not meet ΔT ≥ 4℃, then it is determined whether the exhaust superheat ΔT meets 4℃ > ΔT ≥ 3℃. If it does, the first gas supply electric valve is opened and the second gas supply electric valve is closed.

[0044] As an alternative example, controlling the first and second make-up gas electric valves of the refrigeration equipment based on the exhaust superheat and the terminal temperature difference includes:

[0045] When the exhaust superheat is within the third temperature range, the second supplementary air electric valve is controlled to close, wherein the third temperature range is less than the third threshold and greater than or equal to the fourth threshold.

[0046] Optionally, in this embodiment, the third temperature range can be less than 3°C and greater than or equal to 2°C. When the end temperature difference ΔTd ≥ 2°C, it is determined whether the exhaust superheat ΔT satisfies 3°C > ΔT ≥ 2°C. If it does, the current state of the first gas supply electric valve is maintained, and the second gas supply electric valve is closed.

[0047] As an alternative example, controlling the first and second make-up gas electric valves of the refrigeration equipment based on the exhaust superheat and the terminal temperature difference includes:

[0048] When the exhaust superheat is within the fourth temperature range, the refrigeration equipment is shut down, where the fourth temperature range is less than the fourth threshold.

[0049] Optionally, in this embodiment, the fourth temperature range can be less than 2℃. When the end temperature difference △Td < 2℃, it is determined whether the exhaust superheat △T satisfies △T < 2℃. If it does, the exhaust superheat of the unit is relatively low, and the unit performs shutdown to play a self-protection function.

[0050] As an optional example, the above method also includes:

[0051] The system acquires the liquid level, fully closed setting, intermediate setting, and fully open setting of the flash evaporator of the refrigeration equipment, wherein the fully closed setting is greater than the intermediate setting, which is greater than the fully open setting.

[0052] When the liquid level in the flash evaporator is higher than the fully closed set value, the first and second gas replenishment electric valves are simultaneously closed.

[0053] When the liquid level in the flash evaporator is higher than the intermediate set value and lower than the fully closed set value, the first gas replenishment electric valve is opened and the second gas replenishment electric valve is closed, or the first gas replenishment electric valve is closed and the second gas replenishment electric valve is opened.

[0054] When the liquid level in the flash generator is higher than the fully open set value but lower than the intermediate set value, the first gas replenishment electric valve is opened and the second gas replenishment electric valve is closed, or the first gas replenishment electric valve is closed and the second gas replenishment electric valve is opened, or the first gas replenishment electric valve and the second gas replenishment electric valve are opened simultaneously.

[0055] Optionally, in this embodiment, a liquid level sensor is added to the flash evaporator to monitor and report real-time fluctuations in the flash evaporator. Simultaneously, in conjunction with the gas replenishment electric valve, precise gas replenishment control is achieved using a liquid level control method. Under different load adjustments, reasonable automatic control balances unit safety and energy efficiency. When the flash evaporator liquid level is higher than the fully closed setting, the first and second gas replenishment electric valves are closed to reduce the amount of gas replenishment and eliminate the possibility of liquid carryover during replenishment. When the flash evaporator liquid level is higher than the intermediate setting, one gas replenishment electric valve is closed as needed to appropriately replenish the amount of gas replenishment, reducing the possibility of liquid carryover during replenishment while supplementing the compressor's cooling capacity. When the flash evaporator liquid level is higher than the fully open setting, one or only one gas replenishment electric valve can be fully opened as needed to increase the amount of gas replenishment, maximizing the compressor's cooling capacity without the risk of liquid carryover during replenishment.

[0056] To illustrate with an example, this application relates to a dual-gas-injection regulation method. Conventional refrigeration equipment typically uses dual-gas-injection regulation to unload capacity under low load, adapting the unit's load output to the usage requirements. Under low load conditions, the flash evaporator side pressure increases, and the refrigerant quantity increases, resulting in a rise in the flash evaporator side liquid level. Analysis of extensive operational data shows that under low load conditions, units are prone to liquid carryover during suction, causing liquid slugging on critical components such as the compressor impeller, severe fluctuations in unit current, and irreversible damage to the compressor over prolonged operation, even burning out the unit. Furthermore, chiller units unload capacity under low load conditions by injecting gas to meet usage requirements. However, under the risk of liquid carryover during compressor suction under low load conditions, continuing to unload capacity through gas injection will cause the refrigerant level on the flash evaporator side to rise further, exacerbating the risk of liquid carryover during suction. This method controls the opening of the gas injection electric valve by detecting the compressor's discharge superheat. When the discharge superheat is ≥4℃, the load is adjusted by opening both gas injection valves; when the discharge superheat is <4℃, the load is adjusted first by opening the first gas injection electric valve. When the discharge superheat rises back above 4℃, the second gas injection electric valve is activated for load adjustment, enabling different types of gas injection to open automatically, improving the compressor's efficiency and stability. Segmented control based on discharge superheat allows for graded adjustment of the gas injection valves to adapt to different load outputs. This adapts to the user's actual load requirements and effectively avoids refrigeration system failures caused by compressor load imbalance.

[0057] Optionally, the refrigeration unit hardware mainly includes a gas injection solenoid valve. This solenoid valve can be one or more types, connecting the condenser to the evaporator, the condenser to the flash evaporator, or the flash evaporator to the evaporator. Two types of gas injection solenoid valves are also configured: one connecting the condenser to the flash evaporator, and the other connecting the condenser to the suction port, referred to as the first gas injection electric valve and the second gas injection electric valve, respectively. The implementation process is as follows... Figure 2 As shown:

[0058] Step 1: After the refrigeration equipment is turned on, the condensing pressure Pc, evaporating pressure Pe, exhaust temperature Ta, and chilled water outlet temperature T are obtained by using the condensing pressure sensor, evaporating pressure sensor, exhaust temperature sensor, and chilled water outlet temperature sensor configured on the unit. The above values ​​are then used for matching calculations: the saturated condensing temperature Tc and saturated evaporating temperature Te under the corresponding refrigerant pressure state are found according to the refrigerant thermal property table. The exhaust superheat ΔT = Ta - Tc and the terminal temperature difference ΔTd = T - Te are then obtained.

[0059] Step 2: Determine whether the end temperature difference ΔTd meets the requirement of ΔTd≥2℃. If it does not meet the requirement, no adjustment is needed. If it does meet the requirement, proceed to Step 3.

[0060] Step 3: Determine whether ΔT satisfies ΔT≥4℃. If it does, open the first and second air supply electric valves; if not, proceed to step 4.

[0061] Step 4: Determine whether ΔT satisfies 4℃>ΔT≥3℃. If it does, open the first air supply electric valve and close the second air supply electric valve. If it does not, proceed to step 5.

[0062] Step 5: Determine whether ΔT satisfies 3℃>ΔT≥2℃. If it satisfies, maintain the current state of the first air supply electric valve and close the second air supply electric valve. If it does not satisfy, proceed to step 6.

[0063] Step Six: Determine if ΔT satisfies ΔT < 2℃. If it does, the unit's exhaust superheat is relatively low, and the unit will shut down to perform a self-protection function. If it does not satisfy the condition, it will enter a cyclic detection state.

[0064] Meanwhile, a liquid level sensor is added to the flash generator to monitor and feedback the actual fluctuation of the flash generator in real time. At the same time, it works with the gas replenishment electric valve to achieve precise gas replenishment control according to the liquid level control method. Under different load adjustments, reasonable automatic control is used to achieve a balance between unit safety and energy saving.

[0065] Scenario 1: When the liquid level in the flash generator is higher than the fully closed setting, the first and second electric gas supply valves will be closed to reduce the amount of gas supplied during flash generation and eliminate the possibility of liquid carryover during gas supply.

[0066] Scenario 2: When the liquid level of the flash evaporator is higher than the intermediate set value, one of its gas replenishment electric valves will be closed as needed to appropriately replenish the flash evaporation gas volume, reducing the possibility of liquid carryover during gas replenishment, while replenishing the compressor's cooling capacity with gas replenishment.

[0067] Scenario 3: When the liquid level of the flash evaporator is higher than the fully open setting, the electric gas supply valve can be fully opened or only one of the gas supply valves can be opened as needed to increase the amount of gas supplied for flash evaporation. This will maximize the cooling capacity of the compressor while eliminating the risk of liquid carryover during gas supply.

[0068] Optionally, the above process enables the unit controller to monitor the exhaust superheat and flash evaporator liquid level in real time, and uses program algorithms to achieve electric automatic adjustment of the gas supply valve, so as to reasonably allocate the flash evaporator gas supply and prevent liquid carryover during compressor gas supply.

[0069] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0070] According to another aspect of the embodiments of this application, a dual-gas-supply regulating device is also provided, such as... Figure 3 As shown, it includes:

[0071] The first acquisition module 302 is used to acquire the exhaust superheat and end temperature difference of the refrigeration equipment, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature of the refrigeration equipment, and the end temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration equipment.

[0072] The first control module 304 is used to control the first and second gas supply electric valves of the refrigeration equipment according to the temperature range of the exhaust superheat when the end temperature difference is greater than or equal to the first threshold. The first gas supply electric valve is configured to be located from the condenser of the refrigeration equipment to the flash evaporator of the refrigeration equipment, and the second gas supply electric valve is configured to be located from the condenser to the suction port of the refrigeration equipment.

[0073] Optionally, in this embodiment, after the refrigeration equipment is started, the condensing pressure Pc, evaporating pressure Pe, exhaust temperature Ta, and chilled water outlet temperature T are obtained using the unit's own condensing pressure sensor, evaporating pressure sensor, exhaust temperature sensor, and chilled water outlet sensor, respectively. The saturated condensing temperature Tc and saturated evaporating temperature Te under the corresponding refrigerant pressure state are then obtained according to the refrigerant thermophysical property table. Using these values, the exhaust superheat ΔT = Ta - Tc and the terminal temperature difference ΔTd = T - Te are calculated. The opening of the gas injection electric valve is controlled by detecting the compressor exhaust superheat. The first and second gas injection electric valves are controlled in stages according to the superheat, achieving graded adjustment of the gas injection valves to adapt to different load outputs. The first gas injection electric valve is located at the connection between the condenser and the flash evaporator of the refrigeration equipment, and the second gas injection electric valve is located at the connection between the condenser and the suction port of the refrigeration equipment. This method can adapt to the actual load requirements of the user and effectively avoid refrigeration system failures caused by compressor load imbalance.

[0074] As an optional example, the first acquisition module includes:

[0075] The first acquisition unit is used to acquire the refrigerant thermal property table of the refrigeration equipment;

[0076] The second acquisition unit is used to acquire the condensing pressure and evaporating pressure of the refrigeration equipment;

[0077] The lookup unit is used to find the saturated condensation temperature and saturated evaporation temperature in the refrigerant thermophysical property table based on the condensation pressure and evaporation pressure.

[0078] The third acquisition unit is used to acquire the exhaust temperature and the chilled water outlet temperature;

[0079] The calculation unit is used to calculate the first difference between the exhaust temperature and the saturated condensation temperature to obtain the exhaust superheat, and to calculate the second difference between the chilled water outlet temperature and the saturated evaporation temperature to obtain the end temperature difference.

[0080] Optionally, in this embodiment, the condensing pressure Pc, evaporating pressure Pe, exhaust temperature Ta, and chilled water temperature T are obtained by using the condensing pressure sensor, evaporating pressure sensor, exhaust temperature sensor, and chilled water outlet sensor configured on the unit itself. The saturated condensing temperature Tc and saturated evaporating temperature Te under the corresponding refrigerant pressure state are obtained by looking up the refrigerant thermophysical property table. The exhaust superheat ΔT = Ta - Tc and the terminal temperature difference ΔTd = T - Te are obtained by matching and calculating the above values.

[0081] As an optional example, the first control module includes:

[0082] The first control unit is used to control the first and second make-up air electric valves to open simultaneously when the exhaust superheat is within a first temperature range, wherein the first temperature range is greater than or equal to a second threshold.

[0083] Optionally, in this embodiment, the first threshold can be 2℃, and the first temperature range can be greater than or equal to 4℃. When the terminal temperature difference △Td≥2℃, it is determined whether the exhaust superheat △T satisfies △T≥4℃. If it does, the unit has sufficient margin to adjust the load by replenishing with liquid refrigerant, and the first and second replenishment electric valves are opened.

[0084] As an optional example, the first control module includes:

[0085] The second control unit is used to control the opening of the first replenishment electric valve and the closing of the second replenishment electric valve when the exhaust superheat is within the second temperature range, wherein the second temperature range is less than the second threshold and greater than or equal to the third threshold.

[0086] Optionally, in this embodiment, the second temperature range can be less than 4℃ and greater than or equal to 3℃. When the end temperature difference ΔTd ≥ 2℃, if the exhaust superheat ΔT does not meet ΔT ≥ 4℃, then it is determined whether the exhaust superheat ΔT meets 4℃ > ΔT ≥ 3℃. If it does, the first gas supply electric valve is opened and the second gas supply electric valve is closed.

[0087] As an optional example, the first control module includes:

[0088] The third control unit is used to control the second supplementary gas electric valve to close when the exhaust superheat is within a third temperature range, wherein the third temperature range is less than a third threshold and greater than or equal to a fourth threshold.

[0089] Optionally, in this embodiment, the third temperature range can be less than 3°C and greater than or equal to 2°C. When the end temperature difference ΔTd ≥ 2°C, it is determined whether the exhaust superheat ΔT satisfies 3°C > ΔT ≥ 2°C. If it does, the current state of the first gas supply electric valve is maintained, and the second gas supply electric valve is closed.

[0090] As an optional example, the first control module includes:

[0091] The fourth control unit is used to control the refrigeration equipment to shut down when the exhaust superheat is within a fourth temperature range, wherein the fourth temperature range is less than a fourth threshold.

[0092] Optionally, in this embodiment, the fourth temperature range can be less than 2℃. When the end temperature difference △Td < 2℃, it is determined whether the exhaust superheat △T satisfies △T < 2℃. If it does, the exhaust superheat of the unit is relatively low, and the unit performs shutdown to play a self-protection function.

[0093] As an optional example, the above-described apparatus further includes:

[0094] The second acquisition module is used to acquire the liquid level of the flash evaporator of the refrigeration equipment, the fully closed setting value, the intermediate setting value and the fully open setting value, wherein the fully closed setting value is greater than the intermediate setting value and the fully open setting value.

[0095] The second control module is used to control the first and second gas supply electric valves to close simultaneously when the liquid level in the flash evaporator is higher than the fully closed setting value.

[0096] The third control module is used to control the first gas supply electric valve to open and the second gas supply electric valve to close, or to control the first gas supply electric valve to close and the second gas supply electric valve to open, when the liquid level of the flash generator is higher than the intermediate set value and lower than the fully closed set value.

[0097] The fourth control module is used to control the first gas replenishment electric valve to open and the second gas replenishment electric valve to close, or to control the first gas replenishment electric valve to close and the second gas replenishment electric valve to open, or to control the first gas replenishment electric valve and the second gas replenishment electric valve to open simultaneously, when the liquid level of the flash generator is higher than the fully open set value and lower than the intermediate set value.

[0098] Optionally, in this embodiment, a liquid level sensor is added to the flash evaporator to monitor and report real-time fluctuations in the flash evaporator. Simultaneously, in conjunction with the gas replenishment electric valve, precise gas replenishment control is achieved using a liquid level control method. Under different load adjustments, reasonable automatic control balances unit safety and energy efficiency. When the flash evaporator liquid level is higher than the fully closed setting, the first and second gas replenishment electric valves are closed to reduce the amount of gas replenishment and eliminate the possibility of liquid carryover during replenishment. When the flash evaporator liquid level is higher than the intermediate setting, one gas replenishment electric valve is closed as needed to appropriately replenish the amount of gas replenishment, reducing the possibility of liquid carryover during replenishment while supplementing the compressor's cooling capacity. When the flash evaporator liquid level is higher than the fully open setting, one or only one gas replenishment electric valve can be fully opened as needed to increase the amount of gas replenishment, maximizing the compressor's cooling capacity without the risk of liquid carryover during replenishment.

[0099] For other examples of this embodiment, please refer to the examples above, which will not be repeated here.

[0100] Thirdly, this application provides a refrigeration device, optionally, such as Figure 4 As shown, the above-mentioned equipment includes:

[0101] Exhaust temperature sensor 402 is used to obtain the exhaust temperature of the refrigeration equipment;

[0102] Chilled water outlet sensor 404 is used to obtain the chilled water outlet temperature of refrigeration equipment;

[0103] The condensing pressure sensor 406 is used to acquire the condensing pressure of the refrigeration equipment, wherein the condensing pressure is used to determine the saturated condensation temperature;

[0104] Evaporation pressure sensor 408 is used to acquire the evaporation pressure of the refrigeration equipment, wherein the evaporation pressure is used to determine the saturated evaporation temperature;

[0105] The first gas supply electric valve 410 and the second gas supply electric valve 412 are used to increase the amount of gas supplied by the flash evaporation. The first gas supply electric valve is configured in the connection between the condenser and the flash evaporator of the refrigeration equipment, and the second gas supply electric valve is configured in the connection between the condenser and the suction port of the refrigeration equipment.

[0106] The control module 414 is used to determine the exhaust superheat and end temperature difference of the refrigeration equipment, and when the end temperature difference is greater than or equal to a first threshold, it controls the first gas supply electric valve and the second gas supply electric valve according to the temperature range of the exhaust superheat. The exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature, and the end temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration equipment.

[0107] Optionally, in this embodiment, after the refrigeration equipment is started, the condensing pressure Pc, evaporating pressure Pe, exhaust temperature Ta, and chilled water outlet temperature T are obtained using the unit's own condensing pressure sensor, evaporating pressure sensor, exhaust temperature sensor, and chilled water outlet sensor, respectively. The saturated condensing temperature Tc and saturated evaporating temperature Te under the corresponding refrigerant pressure state are then obtained according to the refrigerant thermophysical property table. Using these values, the exhaust superheat ΔT = Ta - Tc and the terminal temperature difference ΔTd = T - Te are calculated. The opening of the gas injection electric valve is controlled by detecting the compressor exhaust superheat. The first and second gas injection electric valves are controlled in stages according to the superheat, achieving graded adjustment of the gas injection valves to adapt to different load outputs. The first gas injection electric valve is located at the connection between the condenser and the flash evaporator of the refrigeration equipment, and the second gas injection electric valve is located at the connection between the condenser and the suction port of the refrigeration equipment. This method can adapt to the actual load requirements of the user and effectively avoid refrigeration system failures caused by compressor load imbalance.

[0108] Optionally, in this embodiment, when the terminal temperature difference ΔTd ≥ 2℃, it is determined whether the exhaust superheat ΔT satisfies ΔT ≥ 4℃. If it does, the unit has sufficient margin for adjusting the load through liquid refrigerant replenishment, and the first and second replenishment electric valves are opened. If not, it is determined whether ΔT satisfies 4℃ > ΔT ≥ 3℃. If it does, the first replenishment electric valve is opened and the second replenishment electric valve is closed. If not, it is determined whether ΔT satisfies 3℃ > ΔT ≥ 2℃. If it does, the first replenishment electric valve remains in its current state and the second replenishment electric valve is closed. If not, it is determined whether ΔT satisfies ΔT < 2℃. If it does, the unit's exhaust superheat is relatively low, and the unit shuts down, providing a self-protection function. If not, it enters a cyclic detection state.

[0109] As an optional example, the control module is also used to control the first and second gas supply electric valves according to the flash evaporator liquid level of the refrigeration equipment, and the above-mentioned equipment also includes:

[0110] A liquid level sensor is used to obtain the liquid level in the flash evaporator.

[0111] Optionally, in this embodiment, a liquid level sensor is added to the flash evaporator to monitor and report real-time fluctuations in the flash evaporator. Simultaneously, in conjunction with the gas replenishment electric valve, precise gas replenishment control is achieved using a liquid level control method. Under different load adjustments, reasonable automatic control balances unit safety and energy efficiency. When the flash evaporator liquid level is higher than the fully closed setting, the first and second gas replenishment electric valves are closed to reduce the amount of gas replenishment and eliminate the possibility of liquid carryover during replenishment. When the flash evaporator liquid level is higher than the intermediate setting, one gas replenishment electric valve is closed as needed to appropriately replenish the amount of gas replenishment, reducing the possibility of liquid carryover during replenishment while supplementing the compressor's cooling capacity. When the flash evaporator liquid level is higher than the fully open setting, one or only one gas replenishment electric valve can be fully opened as needed to increase the amount of gas replenishment, maximizing the compressor's cooling capacity without the risk of liquid carryover during replenishment.

[0112] For other examples of this embodiment, please refer to the examples above, which will not be repeated here.

[0113] Figure 5 This is a schematic diagram of an optional electronic device according to an embodiment of this application, such as... Figure 5 As shown, it includes a processor 502, a communication interface 504, a memory 506, and a communication bus 508. The processor 502, communication interface 504, and memory 506 communicate with each other via the communication bus 508.

[0114] Memory 506 is used to store computer programs;

[0115] When processor 502 executes a computer program stored in memory 506, it performs the following steps:

[0116] Obtain the exhaust superheat and terminal temperature difference of the refrigeration equipment, where the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature of the refrigeration equipment, and the terminal temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration equipment.

[0117] When the end temperature difference is greater than or equal to the first threshold, the first and second gas supply electric valves of the refrigeration equipment are controlled according to the temperature range of the exhaust superheat. The first gas supply electric valve is configured at the condenser of the refrigeration equipment leading to the flash evaporator of the refrigeration equipment, and the second gas supply electric valve is configured at the suction port of the refrigeration equipment leading to the condenser.

[0118] Optionally, in this embodiment, the communication bus can be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. This communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 The symbol is represented by a single thick line, but this does not indicate that there is only one bus or one type of bus. The communication interface is used for communication between the aforementioned electronic devices and other devices.

[0119] The memory may include RAM, or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0120] As an example, the memory 506 described above may include, but is not limited to, the first acquisition module 302 and the first control module 304 of the dual air replenishment regulating device. Furthermore, it may include, but is not limited to, other module units of the dual air replenishment regulating device, which will not be elaborated upon in this example.

[0121] The processors mentioned above can be general-purpose processors, including but not limited to: CPU (Central Processing Unit), NP (Network Processor), etc.; they can also be DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0122] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0123] Those skilled in the art will understand that Figure 5 The structure shown is for illustrative purposes only. The device that implements the above dual-gas-supply regulation method can be a terminal device, such as a smartphone (e.g., an Android phone, an iOS phone), a tablet computer, a PDA, a mobile internet device (MID), a PAD, or other terminal devices. Figure 5 This does not limit the structure of the aforementioned electronic devices. For example, the electronic device may also include components that are more... Figure 5 The more or fewer components shown (such as network interfaces, display devices, etc.), or having the same Figure 5 The different configurations shown.

[0124] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a computer-readable storage medium, which may include: flash drive, ROM, RAM, disk or optical disk, etc.

[0125] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, wherein a computer program is stored in the computer program, which, when executed by a processor, performs the steps in the above-described dual-gas-replenishment adjustment method.

[0126] Optionally, in this embodiment, those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a computer-readable storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0127] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0128] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0129] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0130] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0131] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0132] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0133] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A dual-qi-replenishment regulation method, characterized in that, include: The exhaust superheat and terminal temperature difference of the refrigeration equipment are obtained, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature of the refrigeration equipment, and the terminal temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration equipment. When the end temperature difference is greater than or equal to the first threshold, the first and second gas supply electric valves of the refrigeration equipment are controlled according to the temperature range of the exhaust superheat. The first gas supply electric valve is configured to connect the condenser of the refrigeration equipment to the flash evaporator of the refrigeration equipment, and the second gas supply electric valve is configured to connect the condenser to the suction port of the refrigeration equipment.

2. The method according to claim 1, characterized in that, The acquisition of the exhaust superheat and end temperature difference of the refrigeration equipment includes: Obtain the refrigerant thermal property table of the refrigeration equipment; Obtain the condensing pressure and evaporating pressure of the refrigeration equipment; Based on the condensation pressure and the evaporation pressure, find the saturated condensation temperature and the saturated evaporation temperature in the refrigerant thermophysical property table; Obtain the exhaust temperature and the chilled water outlet temperature; The exhaust temperature and the saturated condensation temperature are calculated to obtain the exhaust superheat. The chilled water outlet temperature and the saturated evaporation temperature are calculated to obtain the end temperature difference.

3. The method according to claim 1, characterized in that, When the end temperature difference is greater than or equal to a first threshold, controlling the first and second gas supply electric valves of the refrigeration equipment according to the temperature range of the exhaust superheat includes: When the exhaust superheat is within a first temperature range, the first and second replenishment electric valves are simultaneously opened, wherein the first temperature range is greater than or equal to a second threshold.

4. The method according to claim 1, characterized in that, The control of the first and second gas supply electric valves of the refrigeration equipment based on the exhaust superheat and the end temperature difference includes: When the exhaust superheat is within a second temperature range, the first replenishment electric valve is opened and the second replenishment electric valve is closed, wherein the second temperature range is less than a second threshold and greater than or equal to a third threshold.

5. The method according to claim 1, characterized in that, The control of the first and second gas supply electric valves of the refrigeration equipment based on the exhaust superheat and the end temperature difference includes: When the exhaust superheat is within a third temperature range, the second replenishment electric valve is controlled to close, wherein the third temperature range is less than a third threshold and greater than or equal to a fourth threshold.

6. The method according to claim 1, characterized in that, The control of the first and second gas supply electric valves of the refrigeration equipment based on the exhaust superheat and the end temperature difference includes: When the exhaust superheat is within a fourth temperature range, the refrigeration equipment is shut down, wherein the fourth temperature range is less than a fourth threshold.

7. The method according to claim 1, characterized in that, The method further includes: The liquid level of the flash evaporator of the refrigeration equipment, the fully closed setting value, the intermediate setting value, and the fully open setting value are obtained, wherein the fully closed setting value is greater than the intermediate setting value and the fully open setting value. When the liquid level in the flash evaporator is higher than the fully closed setting value, the first gas replenishment electric valve and the second gas replenishment electric valve are controlled to close simultaneously. When the liquid level in the flash evaporator is higher than the intermediate set value and lower than the fully closed set value, the first gas replenishment electric valve is controlled to open and the second gas replenishment electric valve is controlled to close, or the first gas replenishment electric valve is controlled to close and the second gas replenishment electric valve is controlled to open. When the liquid level in the flash evaporator is higher than the fully open setting value and lower than the intermediate setting value, the first gas replenishment electric valve is controlled to open and the second gas replenishment electric valve is controlled to close, or the first gas replenishment electric valve is controlled to close and the second gas replenishment electric valve is controlled to open, or the first gas replenishment electric valve and the second gas replenishment electric valve are controlled to open simultaneously.

8. A dual-gas-replenishment regulating device, characterized in that, include: The first acquisition module is used to acquire the exhaust superheat and end temperature difference of the refrigeration equipment, wherein the exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature of the refrigeration equipment, and the end temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration equipment. A first control module is configured to control a first gas supply electric valve and a second gas supply electric valve of the refrigeration equipment according to the temperature range of the exhaust superheat when the end temperature difference is greater than or equal to a first threshold. The first gas supply electric valve is configured at the connection between the condenser and the flash evaporator of the refrigeration equipment, and the second gas supply electric valve is configured at the connection between the condenser and the intake port of the refrigeration equipment.

9. A refrigeration device, characterized in that, include: Exhaust temperature sensor, used to obtain the exhaust temperature of refrigeration equipment; A chilled water outlet sensor is used to obtain the chilled water outlet temperature of the refrigeration equipment; A condensing pressure sensor is used to acquire the condensing pressure of the refrigeration equipment, wherein the condensing pressure is used to determine the saturated condensation temperature; An evaporation pressure sensor is used to acquire the evaporation pressure of the refrigeration equipment, wherein the evaporation pressure is used to determine the saturated evaporation temperature; A first gas supply electric valve and a second gas supply electric valve are used to increase the amount of gas supplied by the flash evaporation. The first gas supply electric valve is configured in the air inlet of the refrigeration equipment, which is located between the condenser and the flash evaporator of the refrigeration equipment. The control module is used to determine the exhaust superheat and end temperature difference of the refrigeration equipment, and when the end temperature difference is greater than or equal to a first threshold, control the first gas replenishment electric valve and the second gas replenishment electric valve according to the temperature range of the exhaust superheat. The exhaust superheat is the difference between the exhaust temperature and the saturated condensation temperature, and the end temperature difference is the difference between the chilled water outlet temperature and the saturated evaporation temperature of the refrigeration equipment.

10. The device according to claim 9, characterized in that, The control module is further configured to control the first gas replenishment electric valve and the second gas replenishment electric valve according to the liquid level of the flash evaporator of the refrigeration equipment. The equipment also includes: A liquid level sensor is used to obtain the liquid level of the flash evaporator.

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