A refrigeration system with energy-saving control

Abstract

The present invention discloses a refrigeration system with energy-saving control, comprising: a compressor, a condenser, an expansion mechanism and an evaporator, as well as a bypass regulation circuit, a variable capacity liquid reservoir and a main controller; the bypass regulation circuit comprises a first branch pipeline and an electrically controlled flow valve, one end of the first branch pipeline is connected to the outlet of the evaporator, and the other end is connected to the suction port of the compressor; the variable capacity liquid reservoir is connected to the outlet of the evaporator through a second branch pipeline; the main controller is electrically connected to the variable capacity liquid reservoir and the electrically controlled flow valve, and the main controller is configured to: when the refrigeration system is operating in a steady-state mode, obtain the refrigerant temperature Tout and pressure Pout at the outlet of the evaporator, and calculate the superheat of the outlet of the evaporator; based on the superheat and a preset target superheat range, adjust the opening of the electrically controlled flow valve and the volume of the variable capacity liquid reservoir.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration systems, and in particular to a refrigeration system with energy-saving control. Background Art

[0002] The energy efficiency of a refrigeration system directly impacts the overall system's operating costs and energy consumption. In traditional refrigeration systems, to regulate refrigerant flow and system load, some improvements incorporate electronically controlled expansion valves, variable-frequency compressors, and sensors to adjust parameters like evaporating temperature and superheat, improving the system's responsiveness to load fluctuations.

[0003] Chinese invention patent CN108317670A discloses a machine learning-based energy-saving control method and system for refrigeration systems. This method collects information such as ambient temperature, target temperature, and compressor operating status, constructs a feature vector, and inputs it into a training model. This outputs energy-saving control parameters, and a controller dynamically adjusts actuators such as fan speed and compressor frequency. However, this solution relies heavily on the prediction results of the machine learning model, resulting in a lack of transparency in model decisions, making it difficult to cope with dynamic changes under complex operating conditions. Furthermore, in actual operation, this method is prone to response lag or accumulated adjustment errors.

[0004] Therefore, there is an urgent need for an energy-saving control refrigeration system that has higher adjustment stability and control accuracy under variable working conditions and can effectively coordinate the system operation status and energy efficiency performance. Summary of the Invention

[0005] The present invention provides an energy-saving controlled refrigeration system to solve the technical problems in the prior art that it is highly dependent on the prediction results of machine learning models, making it difficult to cope with dynamic changes under complex operating conditions, and is prone to response lag or accumulation of adjustment errors in actual operation.

[0006] To solve the above technical problems, the present invention provides the following technical solution: The present invention provides an energy-saving controlled refrigeration system, comprising: a compressor, a condenser, an expansion mechanism, and an evaporator, wherein the exhaust port of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the evaporator via the expansion mechanism, and the outlet of the evaporator is connected to the suction port of the compressor, thereby forming a closed refrigeration circuit;

[0007] The system also includes a bypass regulation loop, a variable capacity reservoir, and a main controller;

[0008] The bypass regulating circuit includes a first branch pipe and an electrically controlled flow valve, wherein one end of the first branch pipe is connected to the outlet of the evaporator and the other end is connected to the suction port of the compressor, and the electrically controlled flow valve is used to adjust the flow ratio of the gas phase and the liquid phase of the refrigerant drawn from the outlet of the evaporator into the suction port of the compressor;

[0009] The variable capacity accumulator is connected to the outlet of the evaporator through a second branch pipe, and is used to store the incompletely vaporized refrigerant at the outlet of the evaporator;

[0010] The main controller is electrically connected to the variable capacity accumulator and the electronically controlled flow valve. The main controller is configured to obtain the refrigerant temperature Tout and pressure Pout at the evaporator outlet when the refrigeration system is operating in a steady-state mode, and calculate the superheat at the evaporator outlet according to the following formula: ,in, is the saturation temperature at pressure Pout;

[0011] Based on the superheat SH and the preset target superheat range , adjust the opening of the electronically controlled flow valve and the volume of the variable capacity liquid reservoir.

[0012] In an optional embodiment, the variable capacity liquid reservoir includes a liquid storage cavity, a variable capacity structure and a linkage drive assembly;

[0013] The variable capacity structure adopts at least one of a flexible diaphragm, a deformable airbag or a movable piston;

[0014] The linkage drive adopts at least one of a float mechanism, a temperature-sensitive expansion chamber or an electric push rod device;

[0015] The linkage drive assembly is connected to the variable capacity structure and adjusts the volume of the variable capacity liquid reservoir under the control of the main controller.

[0016] In an optional embodiment, the variable capacitance structure adopts a movable piston, and the linkage drive assembly adopts an electric push rod device including a stepping motor, a screw transmission mechanism and a stroke sensor;

[0017] The main controller is based on the superheat SH at the evaporator outlet and the preset target superheat SH target The deviation between the two is used to determine the adjustment amount of the volume of the variable capacity reservoir by the following formula: The target displacement of the movable piston : ( ), .

[0018] Wherein, k is the preset volume adjustment sensitivity coefficient, and A is the effective cross-sectional area of ​​the movable piston;

[0019] The main controller detects the current actual position of the movable piston according to the stroke sensor. The target displacement The difference between the two values ​​is used to output the pulse number and direction signal for controlling the stepping motor;

[0020] The stepper motor rotates under the control of the main controller, and the screw transmission mechanism converts the rotational motion of the stepper motor into linear motion, driving the connected movable piston to move axially in the liquid storage chamber to adjust the effective volume of the variable capacity liquid reservoir.

[0021] In an optional embodiment, the variable volume structure adopts a deformable airbag disposed inside the liquid storage cavity, the linkage drive assembly adopts a temperature-sensitive expansion cavity filled with a heat-sensitive working medium, and the deformable airbag is connected to the temperature-sensitive expansion cavity to form a closed variable volume cavity;

[0022] The main controller determines the heating power of the temperature-sensitive expansion chamber based on the superheat SH at the evaporator outlet using the following formula:

[0023] Wherein, α is the preset expansion response coefficient;

[0024] The main controller is configured to control the heating power according to the outputting a heating signal for controlling a controllable heating element;

[0025] The controllable heating element is in thermal contact with the temperature-sensitive expansion chamber, and heats the temperature-sensitive expansion chamber under the control of the main controller. The volume of the heat-sensitive working medium filled in the temperature-sensitive expansion chamber expands when the temperature in the temperature-sensitive expansion chamber increases, the deformable airbag expands, and the effective volume of the variable-capacity liquid reservoir decreases.

[0026] In an optional embodiment, the variable capacitance structure adopts a flexible diaphragm disposed inside the liquid storage cavity to separate the liquid cavity portion from the gas cavity portion, and the linkage drive assembly adopts a float mechanism disposed inside the liquid storage cavity and comprising a float, a mechanical connecting rod, and a spring-loaded structure. The float mechanism passively floats with changes in the liquid level in the liquid storage cavity, and one end of the flexible diaphragm is connected to the float via the spring-loaded structure and the mechanical connecting rod.

[0027] The main controller is in the state of SH>SH maxIn the case of a flow rate increase, the opening of the electrically controlled flow valve is controlled to increase, the liquid level in the liquid storage chamber rises, the float floats upward, and the spring-loaded structure and the mechanical connecting rod drive the flexible diaphragm to bend axially toward the gas chamber portion, thereby reducing the effective volume of the variable capacity liquid reservoir;

[0028] The main controller is in SH<SH min In this case, the opening of the electrically controlled flow valve is controlled to decrease, the liquid level in the liquid storage chamber drops, and the float floats downward, driving the spring-loaded structure and the mechanical connecting rod to drive the flexible diaphragm to bend axially toward the liquid chamber, thereby increasing the effective volume of the variable capacity liquid reservoir.

[0029] In an optional embodiment, the main controller is configured with a mode adjustment module for dividing the operation mode of the refrigeration system into a pre-cooling mode, the steady-state mode, a buffer mode and a protection mode; when the refrigeration system is started for the first time, restarted after a long period of shutdown, and / or the evaporator temperature is higher than a set start-up threshold, the mode adjustment module controls the refrigeration system to enter the pre-cooling mode operation, and / or, when the compressor continuously operates for more than a preset operation time, the evaporator temperature reaches a preset range for more than a preset temperature time, and / or the superheat SH exceeds a preset steady-state time within the preset target superheat range, the mode adjustment module controls the refrigeration system to enter the steady-state mode operation, and / or, when the temperature at the outlet of the evaporator rises or falls beyond a preset range in a short period of time, and / or the superheat SH is greater than SH max And when the deviation exceeds the preset deviation value, the mode adjustment module controls the refrigeration system to enter the buffer mode operation, and / or, when the pressure sensor in the refrigeration system detects that the pressure exceeds the preset high pressure threshold, and / or the current sensor in the refrigeration system detects that the input current of the compressor exceeds the protection upper limit, and / or the superheat SH exceeds the preset non-steady-state time outside the preset target superheat range, the mode adjustment module controls the refrigeration system to enter the protection mode operation.

[0030] In an optional embodiment, in the pre-cooling mode, at least one of the following operating strategies is adopted: the compressor operates at a speed higher than a preset pre-cooling speed, the electrically controlled flow valve is in a closed state or less than a preset pre-cooling opening, and the variable capacity liquid reservoir maintains a maximum effective volume state; and / or, in the buffer mode, at least one of the following operating strategies is adopted: the compressor is controlled to operate at a preset buffer frequency or to operate intermittently at a preset pulse, and the electrically controlled flow valve is in a state of a preset medium buffer opening; and / or, in the protection mode, at least one of the following operating strategies is adopted: the operating frequency of the compressor is reduced or the operation of the compressor is stopped, the electrically controlled flow valve is limited to below a preset protection opening, the bypass regulation loop is controlled to be fully opened or closed, the alarm module included in the main controller is started and the current operating data is recorded.

[0031] In an optional embodiment, the refrigeration system further includes a heat recovery branch;

[0032] The heat recovery branch includes a micro heat exchanger whose inlet is connected to the exhaust port of the compressor or the outlet of the condenser and whose outlet is connected to the inlet of the evaporator, and is used to transfer heat from the exhaust port of the compressor or the outlet of the condenser to the inlet of the evaporator.

[0033] In an optional embodiment, the heat recovery branch further includes a thermal sensor and a control valve, and the control valve is connected to the micro heat exchanger;

[0034] The thermal sensor is used to collect the target temperature for controlling the start and stop of heat recovery;

[0035] When the target temperature satisfies the preset heat recovery start-up condition, the main controller outputs a control valve opening signal to control the control valve to be in an open state, and the high-temperature refrigerant discharged from the exhaust port of the compressor or the outlet of the condenser flows through the micro heat exchanger, and the micro heat exchanger transfers heat to the inlet of the evaporator;

[0036] When the target temperature satisfies the preset heat recovery closing condition, the main controller outputs a control valve closing signal to control the control valve to be in a closed state, thereby blocking the heat energy recovery branch.

[0037] In an optional embodiment, the thermal sensor is arranged on the ambient side of the refrigeration system and is used to collect the current ambient temperature T env The preset heat recovery start condition is the target heat exchange power calculated based on the following formula: Greater than the preset power threshold:

[0038]

[0039] Among them, β is the heat exchange regulation coefficient, T set is a preset judgment threshold;

[0040] And / or, the thermal sensor is arranged at the inlet of the evaporator and is used to collect the temperature T of the inlet of the evaporator in , the preset heat recovery start condition is T in <T min , where T min is the preset lower threshold;

[0041] And / or, the thermal sensor is arranged at the exhaust port of the compressor and is used to collect the temperature T of the exhaust port of the compressor. out1 , the preset heat recovery start condition is T out1 >T max , where T max is the preset upper threshold;

[0042] and / or, a temperature sensor disposed at the inlet of the evaporator and the outlet of the condenser and used to collect the temperature T at the inlet of the evaporator in and the outlet temperature of the condenser T out2 , the preset heat recovery start condition is (T out2 -T in )>ΔT th , where ΔT th is the preset temperature difference threshold.

[0043] The beneficial effects brought about by the technical solution provided by the present invention include at least:

[0044] The energy-saving controlled refrigeration system provided by the present invention realizes precise regulation of the superheat of the refrigerant at the evaporator outlet by setting a bypass regulating loop, an electrically controlled flow valve and a variable capacity liquid reservoir, thereby ensuring that the refrigeration system can quickly respond to load changes under variable working conditions and maintain stable operation of the system. The variable capacity liquid reservoir cooperates with the coordinated regulation of the electrically controlled flow valve to dynamically adjust the gas-liquid ratio and liquid storage volume of the refrigerant, effectively avoiding the impact of incomplete vaporization of the refrigerant on the operation of the compressor and improving the energy efficiency ratio of the system. By adopting a variety of variable capacity structures and linkage drive component designs, the system's regulating mechanism structure is simple and reliable, with high control sensitivity and easy to implement automated control. The main controller accurately calculates and adjusts the liquid reservoir volume and valve opening based on the feedback information of the superheat at the evaporator outlet, ensuring that the system switches smoothly between various operating modes such as steady-state mode, buffer mode and protection mode, effectively preventing overload or instability in the system operation. Furthermore, the present invention incorporates a heat recovery circuit and a thermal sensor. By collecting real-time temperature information from the compressor exhaust, condenser outlet, and evaporator inlet, the system automatically controls the start and stop of the heat recovery device based on preset temperature thresholds and temperature differentials, improving the overall energy utilization of the refrigeration system and reducing energy consumption. Compared to existing technologies, the present invention does not rely on complex machine learning models, avoiding prediction errors and response lags. It also improves the transparency and feasibility of the control strategy, enhances energy conservation and system stability, and meets energy conservation requirements under complex operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 Schematic diagram of an energy-saving refrigeration system provided by an embodiment of the present invention;

[0047] Figure 2 A schematic structural diagram of a variable capacity liquid reservoir provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operating processes, but the protection scope of the present invention is not limited to the following embodiments.

[0049] In the present invention, words such as "in one possible embodiment," "exemplary," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in the present invention as "in one possible embodiment," "exemplary," or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "in one possible embodiment," "exemplary," or "for example" is intended to present the relevant concepts in a concrete manner.

[0050] Figure 1 This is a schematic diagram of the architecture of an energy-saving control refrigeration system provided by an embodiment of the present invention. Figure 1 As shown, a refrigeration system 10 with energy-saving control includes:

[0051] A compressor 101, a condenser 102, an expansion mechanism 103, and an evaporator 104, wherein the exhaust port of the compressor 101 is connected to the inlet of the condenser 102, the outlet of the condenser 102 is connected to the inlet of the evaporator 104 via the expansion mechanism 103, and the outlet of the evaporator 104 is connected to the intake port of the compressor 101, forming a closed refrigeration circuit;

[0052] The system further includes a bypass regulating loop 105, a variable volume reservoir 106 and a main controller 107;

[0053] The bypass regulating circuit 105 includes a first branch pipe 1051 and an electrically controlled flow valve 1052. One end of the first branch pipe 1051 is connected to the outlet of the evaporator 104, and the other end is connected to the suction port of the compressor 101. The electrically controlled flow valve 1052 is used to adjust the flow ratio of the gas phase and the liquid phase of the refrigerant drawn from the outlet of the evaporator 104 into the suction port of the compressor 101.

[0054] The variable capacity accumulator 106 is connected to the outlet of the evaporator 104 via a second branch pipe 108 and is used to store the incompletely vaporized refrigerant at the outlet of the evaporator 104 ;

[0055] The main controller 107 is electrically connected to the variable capacity liquid reservoir 106 and the electrically controlled flow valve 1052 , and the main controller 107 is configured as follows:

[0056] When the refrigeration system is operating in a steady-state mode, the refrigerant temperature Tout and pressure Pout at the outlet of the evaporator 104 are obtained, and the superheat at the outlet of the evaporator 104 is calculated according to the following formula:

[0057]

[0058] in, is the saturation temperature at pressure Pout;

[0059] Based on the superheat SH and the preset target superheat range , adjust the opening of the electronically controlled flow valve 1052 and the volume of the variable capacity liquid reservoir 106.

[0060] In this embodiment, a basic refrigeration circuit consisting of a compressor, a condenser, an expansion mechanism, and an evaporator is assisted by a bypass regulating circuit, a variable capacity liquid accumulator, and a main controller. According to the subcooling degree and the gas-liquid phase ratio of the refrigerant at different stages in the refrigeration circuit, the opening of the electronically controlled flow valve and the volume of the variable capacity liquid accumulator are dynamically adjusted to keep the refrigerant partially in liquid phase at the evaporator outlet, reduce the suction enthalpy value at the compressor inlet, thereby reducing the compression power consumption, reducing the overall energy consumption, and achieving energy-saving control.

[0061] The bypass regulation circuit is a functional circuit designed to adjust the gas-liquid flow ratio, including a first branch pipeline and an electronically controlled flow valve. For example, the electronically controlled flow valve can be a micro-flow regulating solenoid valve controlled by a stepper motor. This valve utilizes a micro-stepping motor to drive a screw propeller, achieving precise needle valve displacement control and supporting 0.01mm opening adjustment. This valve is suitable for small, variable-load refrigeration systems. The valve core position is fed back in real time by a photoelectric encoder, and closed-loop control improves regulation accuracy. Alternatively, it can be an intelligent flow valve based on a thermo-deformable alloy, using a shape memory alloy wire (such as NiTi) as a driving element. Temperature changes cause the valve core to move, enabling non-electrical control, with the opening adaptively controlled solely by a thermal feedback device. Alternatively, it can be a dual-chamber pressure differential regulation electronically controlled flow valve, equipped with a front and rear pressure balancing mechanism. The electronically controlled driver is solely responsible for adjusting the balancing orifice opening, while the main valve core position is adaptively adjusted using system pressure to control the overall flow rate. These valves can be configured to meet different needs in practical applications and are not limited in this embodiment. In addition, in the bypass regulation circuit, a gas-liquid mixing buffer chamber can be set between the first branch pipeline and the compressor suction port, and a turbulence suppression structure or a gas-liquid guide baffle is provided inside to achieve uniform mixing of the gas phase entering the branch and the main cycle suction gas. The electric control flow valve is used to adjust the flow ratio of the gas phase and the liquid phase of the refrigerant drawn from the outlet of the evaporator entering the suction port of the compressor. Specifically, the refrigerant drawn from the outlet of the evaporator can be partially diverted through a variable capacity accumulator connected to the outlet of the evaporator through a second branch pipeline. In other words, the variable capacity accumulator and the bypass regulation circuit together constitute a phase regulation mechanism on the outlet side of the evaporator, thereby realizing precise control of the refrigerant phase change path and achieving the purpose of energy-saving operation of the system.

[0062] In an optional embodiment, Figure 2 A schematic diagram of the structure of a variable capacity liquid reservoir provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the variable capacity liquid reservoir 106 includes a liquid storage cavity 1061, a variable capacity structure 1062 and a linkage drive assembly 1063;

[0063] The variable capacity structure adopts at least one of a flexible diaphragm, a deformable airbag or a movable piston;

[0064] The linkage drive adopts at least one of a float mechanism, a temperature-sensitive expansion chamber or an electric push rod device;

[0065] The linkage drive assembly is connected to the variable capacity structure and adjusts the volume of the variable capacity liquid reservoir under the control of the main controller.

[0066] For example, a movable piston can be combined with a float mechanism and a temperature-sensitive expansion chamber to adjust the volume of a variable-capacity liquid reservoir. The temperature-sensitive expansion chamber (e.g., a liquid-filled chamber) expands in response to temperature changes, pushing the movable piston to move. The piston movement changes the volume of a certain section of the liquid storage chamber or applies pressure, which is used to regulate the flow of refrigerant. The float mechanism can be installed in the liquid chamber controlled by the piston to sense changes in the liquid level. The temperature-sensitive expansion chamber is responsible for temperature-responsive drive, and the float completes the liquid level response linkage. More specifically, for example, at the evaporator outlet, the temperature-sensitive expansion drives the piston, causing the liquid level in the liquid storage chamber to rise or fall, triggering the float to drive the mechanical linkage to open or close the bypass port.

[0067] For example, a deformable airbag can be combined with a float mechanism and an electric push rod to adjust the volume of a variable-capacity liquid reservoir. The deformable airbag is compressed or released by the push rod, changing its volume and influencing the surrounding liquid level or cavity pressure. A float mechanism is installed above the airbag or in the surrounding liquid to monitor the liquid level changes caused by the airbag's deformation. The electric push rod can precisely control the airbag's volume changes, achieving precise liquid level control. This can be used to construct a liquid level regulation structure using electronic control or mechanical feedback. More specifically, for example, the airbag pushes the liquid to expand, and the change in the float's position activates a bypass valve, forming an electrically controlled liquid discharge structure with a self-test function.

[0068] For another example, a flexible diaphragm can be combined with a temperature-sensitive expansion chamber and an electric push rod to adjust the volume of a variable-capacity accumulator. The flexible diaphragm acts as a deformable interface, separating gas and liquid or hot and cold fluids. When the temperature changes, the temperature-sensitive expansion chamber generates pressure that pushes on the flexible diaphragm, causing it to deform and actuate a control structure (such as a needle valve). Alternatively, the electric push rod can directly act on the diaphragm to adjust the pressure and volume of the downstream chamber. The flexible diaphragm can act as a response element or seal the transmission medium, reducing friction and improving response. More specifically, for example, when the evaporator superheat increases, the expansion chamber drives the flexible diaphragm to open the bypass port, or the push rod compensates for pressure changes to control the throttling path.

[0069] In addition, other methods may also be used to adjust the volume of the variable capacity liquid reservoir. In actual applications, it can be set according to different needs, and this embodiment does not limit this.

[0070] In an optional embodiment, the variable capacitance structure adopts a movable piston, and the linkage drive assembly adopts an electric push rod device including a stepping motor, a screw transmission mechanism and a stroke sensor;

[0071] The main controller is based on the superheat SH at the evaporator outlet and the preset target superheat SH target The deviation between the two is used to determine the adjustment amount of the volume of the variable capacity reservoir by the following formula: The target displacement of the movable piston :

[0072] ( )

[0073]

[0074] Wherein, k is the preset volume adjustment sensitivity coefficient, and A is the effective cross-sectional area of ​​the movable piston;

[0075] The main controller detects the current actual position of the movable piston according to the stroke sensor. The target displacement The difference between the two values ​​is used to output the pulse number and direction signal for controlling the stepping motor;

[0076] The stepper motor rotates under the control of the main controller, and the screw transmission mechanism converts the rotational motion of the stepper motor into linear motion, driving the connected movable piston to move axially in the liquid storage chamber to adjust the effective volume of the variable capacity liquid reservoir.

[0077] For example, the preset target superheat SH targetIt can be determined in advance through experience or performance simulation, for example, it can be 5-10°C. The preset volume adjustment sensitivity coefficient k indicates how much liquid volume needs to be adjusted for every 1°C deviation. It can be determined through engineering debugging, for example, it can be 0.1~5L / °C, or k can be adaptively adjusted according to the ambient temperature or load level. In addition, the distance the piston needs to move can be obtained based on the change in liquid volume and the cross-sectional area. When the controller sends a pulse signal to the stepper motor, each pulse represents a rotation step of a fixed angle and specifies the direction (clockwise / counterclockwise). The controller can also set the frequency and speed to achieve uniform or variable speed drive. Therefore, the main controller outputs a control signal of the corresponding number of steps and direction to the stepper motor based on the difference between the actual position and the target displacement, driving the screw to rotate, thereby realizing the linear advancement or retraction of the piston and completing the adjustment of the liquid reservoir volume.

[0078] In an optional embodiment, the variable volume structure adopts a deformable airbag disposed inside the liquid storage cavity, the linkage drive assembly adopts a temperature-sensitive expansion cavity filled with a heat-sensitive working medium, and the deformable airbag is connected to the temperature-sensitive expansion cavity to form a closed variable volume cavity;

[0079] The main controller determines the heating power of the temperature-sensitive expansion chamber based on the superheat SH at the evaporator outlet using the following formula:

[0080] Wherein, α is the preset expansion response coefficient;

[0081] The main controller is configured to control the heating power according to the outputting a heating signal for controlling a controllable heating element;

[0082] The controllable heating element is in thermal contact with the temperature-sensitive expansion chamber, and heats the temperature-sensitive expansion chamber under the control of the main controller. The volume of the heat-sensitive working medium filled in the temperature-sensitive expansion chamber expands when the temperature in the temperature-sensitive expansion chamber increases, the deformable airbag expands, and the effective volume of the variable-capacity liquid reservoir decreases.

[0083] Exemplarily, the temperature-sensitive expansion chamber and the airbag can be connected by a high-temperature and pressure-resistant hose, and the interior can be the same gas medium, such as air, nitrogen or fluoride gas. The medium is heated under the control of the main controller to cause volume expansion and drive the airbag to deform.

[0084] In an optional embodiment, the variable capacitance structure adopts a flexible diaphragm disposed inside the liquid storage cavity to separate the liquid cavity portion from the gas cavity portion, and the linkage drive assembly adopts a float mechanism disposed inside the liquid storage cavity and comprising a float, a mechanical connecting rod, and a spring-loaded structure. The float mechanism passively floats with changes in the liquid level in the liquid storage cavity, and one end of the flexible diaphragm is connected to the float via the spring-loaded structure and the mechanical connecting rod.

[0085] The main controller is in the state of SH>SH max In the case of a flow rate increase, the opening of the electrically controlled flow valve is controlled to increase, the liquid level in the liquid storage chamber rises, the float floats upward, and the spring-loaded structure and the mechanical connecting rod drive the flexible diaphragm to bend axially toward the gas chamber portion, thereby reducing the effective volume of the variable capacity liquid reservoir;

[0086] The main controller is in SH<SH min In this case, the opening of the electrically controlled flow valve is controlled to decrease, the liquid level in the liquid storage chamber drops, and the float floats downward, driving the spring-loaded structure and the mechanical connecting rod to drive the flexible diaphragm to bend axially toward the liquid chamber, thereby increasing the effective volume of the variable capacity liquid reservoir.

[0087] For example, when the liquid level rises, the float rises under the buoyancy of the liquid. Through a mechanical linkage, this upward force is converted into an upward thrust, causing the flexible diaphragm to deform, changing the effective volume of the liquid storage chamber. A spring-loaded structure provides deformation limiting, cushioning, or resilience to ensure system stability. The flexible diaphragm can be made of a refrigerant-resistant elastic material (such as rubber, fluororubber, silicone, or polyurethane) and installed inside the reservoir, dividing the reservoir chamber into two sections: a liquid chamber (which stores the refrigerant liquid) and a gas chamber (which stores the refrigerant gas, primarily the gaseous refrigerant returning from the evaporator and its vapor phase). One side of the flexible diaphragm directly contacts the liquid, while the other side is the vapor phase. The edge of the flexible diaphragm can be secured to the inner wall of the reservoir using a sealing structure (such as a flange, clamp, or weld) to ensure a tight seal and prevent gas-liquid mixing. The spring can be installed in the transmission mechanism between the mechanical linkage and the flexible diaphragm, or directly on the edge mounting structure of the flexible diaphragm.

[0088] In the evaporator, low-pressure liquid refrigerant absorbs heat and gradually vaporizes. Ideally, it should be completely vaporized at the evaporator's outlet, but in practice, some liquid often remains incompletely vaporized, forming a gas-liquid mixture. The compressor compresses "refrigerant gas." The higher the enthalpy of the incoming refrigerant—that is, the greater the heat content per unit mass—the more work required for compression. If the incoming refrigerant contains some partially vaporized droplets (i.e., cooler and with a lower enthalpy), the energy required for compression is reduced. Therefore, a variable volume accumulator is used to temporarily retain the liquid refrigerant at the evaporator outlet and control the gas-liquid ratio in the refrigerant flowing to the compressor. By adjusting the volume of the variable volume accumulator, some partially vaporized liquid refrigerant is selectively retained at the evaporator outlet, thereby maintaining a lower specific enthalpy for the refrigerant entering the compressor, thereby reducing the compressor's compression load and energy consumption.

[0089] In addition, a one-way valve can be installed at the inlet and outlet of the variable capacity liquid accumulator to limit the refrigerant in the liquid accumulator to flow back into the main circulation only when the pressure difference meets the conditions, thereby preventing liquid backflow. In actual applications, this can be set according to different needs, and this embodiment does not limit this.

[0090] In this embodiment, the entire operating cycle of the refrigeration system can be divided into multiple modes (such as pre-cooling, steady state, buffering, and protection). Each mode adopts a different load control strategy, and energy saving is optimized through the entire scheduling sequence and switching points, which is suitable for periodic fluctuating load scenarios.

[0091] In an optional embodiment, the main controller is configured with a mode adjustment module for dividing the operation mode of the refrigeration system into a pre-cooling mode, the steady-state mode, a buffer mode and a protection mode; when the refrigeration system is started for the first time, restarted after a long period of shutdown, and / or the evaporator temperature is higher than a set start-up threshold, the mode adjustment module controls the refrigeration system to enter the pre-cooling mode operation, and / or, when the compressor continuously operates for more than a preset operation time, the evaporator temperature reaches a preset range for more than a preset temperature time, and / or the superheat SH exceeds a preset steady-state time within the preset target superheat range, the mode adjustment module controls the refrigeration system to enter the steady-state mode operation, and / or, when the temperature at the outlet of the evaporator rises or falls beyond a preset range in a short period of time, and / or the superheat SH is greater than SH maxAnd when the deviation exceeds the preset deviation value, the mode adjustment module controls the refrigeration system to enter the buffer mode operation, and / or, when the pressure sensor in the refrigeration system detects that the pressure exceeds the preset high pressure threshold, and / or the current sensor in the refrigeration system detects that the input current of the compressor exceeds the protection upper limit, and / or the superheat SH exceeds the preset non-steady-state time outside the preset target superheat range, the mode adjustment module controls the refrigeration system to enter the protection mode operation.

[0092] For example, the slope change ΔQ / Δt of the refrigeration system load change and the preset threshold Q th The comparison result of the mode switching is used to determine the timing of the mode switching, based on the superheat SH at the evaporator outlet and its time average SH avg The specific mode is determined based on the deviation range ΔSH of the compressor start / stop frequency, operating time, or vibration intensity changes. An empirical rule library is used to select the current mode type. Furthermore, operating parameters within different modes may include, but are not limited to, the target frequency of the compressor, the opening of the expansion mechanism, the target volume of the accumulator, and the target opening of the electronically controlled flow valve.

[0093] The main controller can adopt different operation control strategies for the compressor, expansion mechanism, electronically controlled flow valve and variable capacity liquid storage device in different modes.

[0094] In an optional embodiment, in the pre-cooling mode, at least one of the following operating strategies is adopted: the compressor operates at a speed higher than a preset pre-cooling speed, the electrically controlled flow valve is in a closed state or less than a preset pre-cooling opening, and the variable capacity liquid reservoir maintains a maximum effective volume state; and / or, in the buffer mode, at least one of the following operating strategies is adopted: the compressor is controlled to operate at a preset buffer frequency or to operate intermittently at a preset pulse, and the electrically controlled flow valve is in a state of a preset medium buffer opening; and / or, in the protection mode, at least one of the following operating strategies is adopted: the operating frequency of the compressor is reduced or the operation of the compressor is stopped, the electrically controlled flow valve is limited to below a preset protection opening, the bypass regulation loop is controlled to be fully opened or closed, the alarm module included in the main controller is started and the current operating data is recorded.

[0095] For example, pre-cooling mode is used to rapidly reduce the evaporator temperature to the target cooling range. The superheat (SH) may temporarily deviate from the target value. The main controller controls the compressor to operate at medium-high speed, prioritizing rapid establishment of the refrigeration cycle. The expansion mechanism opening is prioritized to reduce the evaporator temperature. The electronically controlled flow valve is closed or slightly opened (e.g., ≤10%) to prevent direct liquid ingress to the compressor. The variable volume accumulator maintains its maximum effective volume to absorb excess unvaporized liquid. Buffer mode is used to mitigate system instability caused by sudden load changes, avoiding direct entry into protection mode. After stable operation is restored, the system switches back to steady-state mode. The main controller reduces the compressor frequency to minimum or intermittent operation (pulse load). The electronically controlled flow valve maintains an intermediate opening to minimize the impact of liquid fluctuations. The variable volume accumulator temporarily adjusts its volume to absorb and release excess liquid, and a bypass control loop is activated for rapid gas-liquid diversion. Protection mode is used to prevent the risk of compressor overload, excessive high pressure, or system failure.

[0096] In this embodiment, a micro heat exchange branch can be set up in the refrigeration system to recover the compressor exhaust heat or the condenser waste heat to increase or maintain the temperature of the key nodes of the system. The residual heat at the hot end can be used for temperature control during low-load operation to reduce unnecessary energy loss. This is not to achieve energy saving through intelligent control, but rather energy self-recovery regulation of the structural physical loop, which is particularly suitable for winter or low-load operation.

[0097] In an optional embodiment, the refrigeration system further includes a heat recovery branch;

[0098] The heat recovery branch includes a micro heat exchanger whose inlet is connected to the exhaust port of the compressor or the outlet of the condenser and whose outlet is connected to the inlet of the evaporator, and is used to transfer heat from the exhaust port of the compressor or the outlet of the condenser to the inlet of the evaporator.

[0099] For example, the structure of the micro heat exchanger can be a fin-tube type, a microchannel structure, a phase change heat storage structure, etc., and the phase change material can be paraffin, fluoride or molten metal material, etc., to improve the heat exchange efficiency and realize the buffer temperature regulation function.

[0100] The main controller can determine whether to open the heat recovery branch based on the current operating status parameters of the system (such as evaporator outlet temperature, compressor exhaust temperature, condensing pressure, etc.).

[0101] In an optional embodiment, the heat recovery branch further includes a thermal sensor and a control valve, and the control valve is connected to the micro heat exchanger;

[0102] The thermal sensor is used to collect the target temperature for controlling the start and stop of heat recovery;

[0103] When the target temperature satisfies the preset heat recovery start-up condition, the main controller outputs a control valve opening signal to control the control valve to be in an open state, and the high-temperature refrigerant discharged from the exhaust port of the compressor or the outlet of the condenser flows through the micro heat exchanger, and the micro heat exchanger transfers heat to the inlet of the evaporator;

[0104] When the target temperature satisfies the preset heat recovery closing condition, the main controller outputs a control valve closing signal to control the control valve to be in a closed state, thereby blocking the heat energy recovery branch.

[0105] For example, the heat recovery branch can be opened and closed using a control valve, such as a solenoid valve, a one-way valve, a proportional control valve, or a thermal valve, to control the on / off state or heat exchange intensity of the heat recovery branch based on the system load. Furthermore, an insulating jacket can be included to cover the non-heat exchange pipe sections in the heat recovery branch to reduce heat loss to the environment.

[0106] In an optional embodiment, the thermal sensor is arranged on the ambient side of the refrigeration system and is used to collect the current ambient temperature T env The preset heat recovery start condition is the target heat exchange power calculated based on the following formula: Greater than the preset power threshold:

[0107] Among them, β is the heat exchange regulation coefficient, T set is a preset judgment threshold;

[0108] And / or, the thermal sensor is arranged at the inlet of the evaporator and is used to collect the temperature T of the inlet of the evaporator in , the preset heat recovery start condition is T in <T min , where T min is the preset lower threshold;

[0109] And / or, the thermal sensor is arranged at the exhaust port of the compressor and is used to collect the temperature T of the exhaust port of the compressor. out1 , the preset heat recovery start condition is T out1 >T max , where T max is the preset upper threshold;

[0110] and / or, a temperature sensor disposed at the inlet of the evaporator and the outlet of the condenser and used to collect the temperature T at the inlet of the evaporator in and the outlet temperature of the condenser T out2 , the preset heat recovery start condition is (T out2 -T in)>ΔT th , where ΔT th is the preset temperature difference threshold.

[0111] For example, in pre-cooling mode, the main controller can control the control valve to open, allowing some of the high-temperature refrigerant at the compressor exhaust or condenser outlet to flow along the heat recovery branch, where it heats up the low-temperature refrigerant at the evaporator inlet through heat exchange. A flow restriction orifice or microchannel structure can be installed in the heat recovery branch to limit the refrigerant flow to 10% to 30% of the compressor exhaust flow, preventing the risk of system oscillation or liquid hammer caused by excessive heat transfer.

[0112] Based on the above structure, the energy-saving controlled refrigeration system provided by the present invention realizes precise regulation of the superheat of the refrigerant at the evaporator outlet by setting a bypass regulating loop, an electrically controlled flow valve and a variable capacity liquid reservoir, ensuring that the refrigeration system can quickly respond to load changes under variable working conditions and maintain stable operation of the system. The variable capacity liquid reservoir cooperates with the coordinated regulation of the electrically controlled flow valve to dynamically adjust the gas-liquid ratio and liquid storage volume of the refrigerant, effectively avoiding the impact of incomplete vaporization of the refrigerant on the operation of the compressor and improving the energy efficiency ratio of the system. By adopting a variety of variable capacity structures and linkage drive component design schemes, the system's regulating mechanism structure is simple and reliable, with high control sensitivity and easy to implement automatic control. The main controller accurately calculates and adjusts the liquid reservoir volume and valve opening according to the feedback information of the superheat at the evaporator outlet, ensuring that the system switches smoothly between various operating modes such as steady-state mode, buffer mode and protection mode, effectively preventing the system from overload or instability. Furthermore, the present invention incorporates a heat recovery circuit and a thermal sensor. By collecting real-time temperature information from the compressor exhaust, condenser outlet, and evaporator inlet, the system automatically controls the start and stop of the heat recovery device based on preset temperature thresholds and temperature differentials, improving the overall energy utilization of the refrigeration system and reducing energy consumption. Compared to existing technologies, the present invention does not rely on complex machine learning models, avoiding prediction errors and response lags. It also improves the transparency and feasibility of the control strategy, enhances energy conservation and system stability, and meets energy conservation requirements under complex operating conditions.

[0113] Furthermore, it should be noted that the present invention may be provided as a method, apparatus, or computer program product. Thus, embodiments of the present invention may take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media containing computer-usable program code.

[0114] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0115] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, so that a series of operation steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for implementing the process in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0116] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. The terms "comprises," "includes," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0117] Finally, it should be noted that the above is a preferred embodiment of the present invention. It should be noted that although the preferred embodiment of the present invention has been described, it is clear that those skilled in the art, once they understand the basic inventive concept of the present invention, can make various improvements and modifications without departing from the principles of the present invention. Such improvements and modifications should also be considered as within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the embodiments of the present invention.

Claims

1. A refrigeration system with energy-saving control, characterized in that: include: A compressor, a condenser, an expansion mechanism, and an evaporator, wherein the exhaust port of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the evaporator via the expansion mechanism, and the outlet of the evaporator is connected to the suction port of the compressor, forming a closed refrigeration circuit; The system also includes a bypass regulation loop, a variable capacity reservoir, and a main controller; The bypass regulating circuit includes a first branch pipe and an electrically controlled flow valve, wherein one end of the first branch pipe is connected to the outlet of the evaporator and the other end is connected to the suction port of the compressor, and the electrically controlled flow valve is used to adjust the flow ratio of the gas phase and the liquid phase of the refrigerant drawn from the outlet of the evaporator into the suction port of the compressor; The variable capacity accumulator is connected to the outlet of the evaporator through a second branch pipe, and is used to store the incompletely vaporized refrigerant at the outlet of the evaporator; The main controller is electrically connected to the variable capacity liquid reservoir and the electronically controlled flow valve, and the main controller is configured as follows: When the refrigeration system is operating in a steady-state mode, the refrigerant temperature Tout and pressure Pout at the evaporator outlet are obtained, and the superheat at the evaporator outlet is calculated according to the following formula: Wherein, is the saturation temperature at pressure Pout; Based on the superheat SH and the preset target superheat range , adjusting the opening of the electronically controlled flow valve and the volume of the variable capacity reservoir; The variable capacity liquid reservoir comprises a liquid storage cavity, a variable capacity structure and a linkage drive assembly; The variable capacity structure adopts at least one of a flexible diaphragm, a deformable airbag or a movable piston; The linkage drive adopts at least one of a float mechanism, a temperature-sensitive expansion chamber or an electric push rod device; The linkage drive assembly is connected to the variable capacity structure and adjusts the volume of the variable capacity liquid reservoir under the control of the main controller.

2. The refrigeration system with energy-saving control according to claim 1, characterized in that: The variable capacity structure adopts a movable piston, and the linkage drive assembly adopts an electric push rod device including a stepping motor, a screw transmission mechanism and a stroke sensor; The main controller is based on the superheat SH at the evaporator outlet and the preset target superheat SH target The deviation between the two is used to determine the adjustment amount of the volume of the variable capacity reservoir by the following formula: The target displacement of the movable piston : ( )， , Wherein, k is the preset volume adjustment sensitivity coefficient, and A is the effective cross-sectional area of ​​the movable piston; The main controller detects the current actual position of the movable piston according to the stroke sensor. The target displacement The difference between the two values ​​is used to output the pulse number and direction signal for controlling the stepping motor; The stepper motor rotates under the control of the main controller, and the screw transmission mechanism converts the rotational motion of the stepper motor into linear motion, driving the connected movable piston to move axially in the liquid storage chamber to adjust the effective volume of the variable capacity liquid reservoir.

3. The refrigeration system with energy-saving control according to claim 1, characterized in that: The variable volume structure adopts a deformable airbag arranged inside the liquid storage cavity, and the linkage drive component adopts a temperature-sensitive expansion cavity filled with a heat-sensitive working medium. The deformable airbag is connected to the temperature-sensitive expansion cavity to form a closed variable volume cavity; The main controller determines the heating power of the temperature-sensitive expansion chamber based on the superheat SH at the evaporator outlet using the following formula: , Wherein, α is the preset expansion response coefficient; The main controller is configured to control the heating power according to the outputting a heating signal for controlling a controllable heating element; The controllable heating element is in thermal contact with the temperature-sensitive expansion chamber, and heats the temperature-sensitive expansion chamber under the control of the main controller. The volume of the heat-sensitive working medium filled in the temperature-sensitive expansion chamber expands when the temperature in the temperature-sensitive expansion chamber increases, the deformable airbag expands, and the effective volume of the variable-capacity liquid reservoir decreases.

4. The refrigeration system with energy-saving control according to claim 2, characterized in that: The variable capacitance structure adopts a flexible diaphragm arranged inside the liquid storage cavity to separate the liquid cavity part and the gas cavity part. The linkage drive assembly adopts a float mechanism arranged inside the liquid storage cavity and including a float, a mechanical connecting rod and a spring loading structure. The float mechanism passively floats with the change of the liquid level in the liquid storage cavity. One end of the flexible diaphragm is connected to the float through the spring loading structure and the mechanical connecting rod. The main controller is in the state of SH>SH max In the case of, the opening of the electronically controlled flow valve is controlled to increase, The liquid level in the liquid storage chamber rises, and the float floats upward, driving the spring-loaded structure and the mechanical connecting rod to cause the flexible diaphragm to bend axially toward the gas chamber portion, thereby reducing the effective volume of the variable capacity liquid reservoir; The main controller is in SH<SH min In this case, the opening of the electrically controlled flow valve is controlled to decrease, the liquid level in the liquid storage chamber drops, and the float floats downward, driving the spring-loaded structure and the mechanical connecting rod to drive the flexible diaphragm to bend axially toward the liquid chamber, thereby increasing the effective volume of the variable capacity liquid reservoir.

5. The refrigeration system with energy-saving control according to claim 1, characterized in that: The main controller is configured with a mode adjustment module for dividing the operating mode of the refrigeration system into a pre-cooling mode, the steady-state mode, a buffer mode and a protection mode; When the refrigeration system is started for the first time, restarted after a long period of shutdown, and / or the evaporator temperature is higher than the set start-up threshold, the mode adjustment module controls the refrigeration system to enter the pre-cooling mode, and / or, When the compressor continuously operates for more than a preset operating time, the temperature of the evaporator reaches a preset range for more than a preset temperature time, and / or the superheat degree SH exceeds a preset steady-state time within the preset target superheat range, the mode adjustment module controls the refrigeration system to enter the steady-state mode, and / or, The temperature at the outlet of the evaporator increases or decreases beyond a preset range in a short period of time, and / or the superheat SH is greater than SH max and when the deviation exceeds a preset deviation value, the mode adjustment module controls the refrigeration system to enter the buffer mode operation, and / or, When the pressure sensor in the refrigeration system detects that the pressure exceeds a preset high-pressure threshold, and / or the current sensor in the refrigeration system detects that the input current of the compressor exceeds a protection upper limit, and / or the superheat degree SH exceeds a preset non-steady-state time outside the preset target superheat range, the mode adjustment module controls the refrigeration system to enter the protection mode operation.

6. The refrigeration system with energy-saving control according to claim 5, characterized in that: In the pre-cooling mode, at least one of the following operating strategies is adopted: the compressor operates at a speed higher than a preset pre-cooling speed, the electronically controlled flow valve is closed or has a smaller opening than a preset pre-cooling speed, and the variable capacity accumulator maintains a maximum effective volume; and / or, In the buffer mode, at least one of the following operating strategies is adopted: controlling the compressor to operate at a preset buffer frequency or to operate intermittently at a preset pulse, and the electronically controlled flow valve is in a state of a preset medium buffer opening; and / or, In the protection mode, at least one of the following operating strategies is adopted: reducing the operating frequency of the compressor or stopping the operation of the compressor, limiting the electronically controlled flow valve to below the preset protection opening, controlling the bypass regulation loop to be fully opened or closed, and starting the alarm module included in the main controller and recording the current operating data.

7. The refrigeration system with energy-saving control according to claim 1, characterized in that: The refrigeration system further includes a heat recovery branch; The heat recovery branch includes a micro heat exchanger whose inlet is connected to the exhaust port of the compressor or the outlet of the condenser and whose outlet is connected to the inlet of the evaporator, and is used to transfer heat from the exhaust port of the compressor or the outlet of the condenser to the inlet of the evaporator.

8. The refrigeration system with energy-saving control according to claim 7, characterized in that: The heat recovery branch further includes a thermal sensor and a control valve, and the control valve is connected to the micro heat exchanger; The thermal sensor is used to collect the target temperature for controlling the start and stop of heat recovery; When the target temperature satisfies the preset heat recovery start-up condition, the main controller outputs a control valve opening signal to control the control valve to be in an open state, and the high-temperature refrigerant discharged from the exhaust port of the compressor or the outlet of the condenser flows through the micro heat exchanger, and the micro heat exchanger transfers heat to the inlet of the evaporator; When the target temperature satisfies the preset heat recovery closing condition, the main controller outputs a control valve closing signal to control the control valve to be in a closed state, thereby blocking the heat energy recovery branch.

9. The refrigeration system with energy-saving control according to claim 8, characterized in that: The thermal sensor is set on the ambient side of the refrigeration system and is used to collect the current ambient temperature T env The preset heat recovery start condition is the target heat exchange power calculated based on the following formula: Greater than the preset power threshold: , Among them, β is the heat exchange regulation coefficient, T set is a preset judgment threshold; And / or, the thermal sensor is arranged at the inlet of the evaporator and is used to collect the temperature T of the inlet of the evaporator in , the preset heat recovery start condition is T in <T min , where T min is the preset lower threshold; And / or, the thermal sensor is arranged at the exhaust port of the compressor and is used to collect the temperature T of the exhaust port of the compressor. out1 , the preset heat recovery start condition is T out1 >T max , where T max is the preset upper threshold; and / or, a temperature sensor disposed at the inlet of the evaporator and the outlet of the condenser and used to collect the temperature T at the inlet of the evaporator in and the outlet temperature of the condenser T out2 , the preset heat recovery start condition is T out2 -T in )>ΔT th , where ΔT th is the preset temperature difference threshold.

Images