Control system, method and refrigeration appliance

Abstract

The application provides a control system, a method and a refrigeration equipment. The control system comprises a condenser and an evaporator device connected in sequence; a supply device and a spraying device connected, the supply device is used for conveying defrosting liquid to the spraying device; the spraying device is arranged above the evaporator device and is used for spraying defrosting to the evaporator device; a first energy storage heat exchange device is used for heat exchange and heat storage; the first energy storage heat exchange device has at least two first phase change energy storage heat exchangers, each first phase change energy storage heat exchanger is provided with a first flow passage for refrigerant circulation and a second flow passage for defrosting liquid circulation; and each first flow passage is connected to the condenser and the evaporator in an on-off mode. The control system effectively solves the technical problem that in the prior art, when the condensing temperature is low and the frost layer is thick, the heat stored in the heat exchanger cannot meet the heat demand of defrosting, resulting in poor defrosting effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a control system, method and refrigeration equipment. BACKGROUND

[0002] In the industry of cold storage and cold chain transportation, the evaporator in the refrigeration equipment is prone to frosting due to the low temperature requirement of the refrigeration environment. Frosting on the evaporator affects air flow and reduces heat exchange efficiency, thereby failing to achieve the expected refrigeration effect. Therefore, the evaporator needs to be defrosted regularly.

[0003] Currently, in order to save energy and improve the refrigeration effect by reducing the temperature of the refrigerant, a heat exchanger is usually arranged at the outlet of the condenser to absorb and store the waste heat of the refrigerant so as to utilize the waste heat when defrosting is needed. However, when the condensing temperature is low, the heat release capacity of the refrigerant is weakened, resulting in a decrease in the available waste heat in the heat exchanger. This means that when defrosting, the stored waste heat may not be sufficient to provide the required heat, thereby affecting the efficiency of the defrosting process.

[0004] In addition, when the frost layer is thick, the heat required for defrosting will increase significantly. The thick frost layer not only increases the thermal resistance and reduces the heat exchange efficiency, but also requires more heat to melt the frost layer. If the stored waste heat in the heat exchanger is insufficient, the defrosting time will be prolonged. Therefore, in the case of low condensing temperature and thick frost layer, the system in the prior art may have an energy imbalance phenomenon, which cannot meet the heat demand of defrosting. This not only prolongs the defrosting time, but also may cause the system efficiency to decrease, increasing the operating cost. SUMMARY

[0005] The present application aims to overcome the above technical deficiencies and provide a control system, method and refrigeration equipment to solve the technical problem of poor defrosting effect in the prior art when the condensing temperature is low and the frost layer is thick, which may not meet the heat demand of defrosting.

[0006] To achieve the above technical purposes, according to one aspect of the present application: a control system is provided, comprising: a condenser and an evaporator device connected in sequence; a supply device and a spraying device connected, the supply device being used for conveying defrosting liquid to the spraying device; the spraying device being arranged above the evaporator device and being used for spraying defrosting to the evaporator device; a first energy storage heat exchange device being used for heat exchange and heat storage; the first energy storage heat exchange device having at least two first phase change energy storage heat exchangers, each first phase change energy storage heat exchanger being provided with a first flow-through part for refrigerant flow-through and a second flow-through part for defrosting liquid flow-through; each first flow-through part being connected to the condenser and the evaporator in an on-off manner respectively, and each second flow-through part being connected to the supply device and the spraying device in an on-off manner respectively; wherein, in a refrigeration mode, the connection of each first flow-through part to the condenser and the evaporator device is controlled in sequence, so that the phase change material of each first phase change energy storage heat exchanger absorbs and stores the heat released by the refrigerant flowing into the corresponding first flow-through part in sequence, and each second flow-through part is disconnected from the supply device and the spraying device respectively; in a defrosting mode, each first flow-through part is disconnected from the condenser and the evaporator device respectively, and each second flow-through part is connected to the supply device and the spraying device in an on-off manner adaptively according to the current temperature of the phase change material of each first phase change energy storage heat exchanger.

[0007] Further, the control system further comprises: a control device, the control device being used for judging whether to switch from the refrigeration mode to the defrosting mode and obtaining the current temperature of the phase change material of each first phase change energy storage heat exchanger, and adaptively controlling the on-off of each first flow-through part to the condenser and the evaporator device and the on-off of each second flow-through part to the supply device and the spraying device according to the judgment result and the current temperature of each phase change material.

[0008] Further, the control system further comprises: at least two first control valves, each first control valve being arranged one-to-one with each first phase change energy storage heat exchanger, each first control valve being connected to the input end of the corresponding first flow-through part and the output end of the condenser respectively; each first control valve being used for controlling the on-off between the corresponding first flow-through part and the condenser; a second control valve, the input end of the second control valve being connected to the output end of each first flow-through part respectively, and the output end of the second control valve being connected to the input end of the evaporator device; the second control valve being used for controlling the on-off between each first flow-through part and the evaporator device.

[0009] Further, the control system further comprises: a third control valve, an input end of the third control valve being connected with an output end of the supply device, and output ends of the third control valve being respectively connected with input ends of the second flow passages; the third control valve being used for controlling on-off between the supply device and the input ends of the second flow passages; at least two fourth control valves, each of the fourth control valves being correspondingly arranged with each of the first phase-change energy storage heat exchangers, each of the fourth control valves being arranged between the third control valve and the input end of the corresponding second flow passage, and each of the fourth control valves being connected with the input end of the corresponding second flow passage and the output end of the third control valve.

[0010] Further, the control system further comprises: a filter device, the filter device being arranged between the supply device and the first energy storage heat exchange device, and the filter device being respectively connected with the input end of the supply device and the input ends of the second flow passages; the filter device being used for filtering the defrosting liquid.

[0011] Further, the evaporator device comprises: at least one evaporator, an input end of the evaporator being connectable and disconnectable with an output end of each of the first flow passages; the supply device comprises: at least one water pan, the water pan being correspondingly arranged with the evaporator, the water pan being arranged below the corresponding evaporator, and the water pan being used for collecting and storing the defrosting liquid flowing down from the evaporator; and an output end of the water pan being connectable and disconnectable with an input end of each of the second flow passages.

[0012] Further, the supply device further comprises: at least one water pump, the water pump being correspondingly arranged with the water pan, an input end of the water pump being connected with an output end of the corresponding water pan, and an output end of the water pump being connectable and disconnectable with the input end of each of the second flow passages; and / or a water supplement pipeline, the water supplement pipeline being connected with the water pan, and the water supplement pipeline being used for supplementing the defrosting liquid to the water pan.

[0013] Further, the evaporator device comprises: an evaporator, an input end of at least one evaporator being connectable and disconnectable with an output end of each of the first flow passages; the spray device comprises: at least one sprayer, the sprayer being correspondingly arranged with the evaporator, the sprayer being arranged above the corresponding evaporator, and the sprayer being used for spraying the defrosting liquid to the corresponding evaporator for defrosting; and an input end of the sprayer being connectable and disconnectable with an output end of each of the second flow passages.

[0014] Further, the control system further comprises: at least one fifth control valve, the fifth control valve being correspondingly arranged with the sprayer, and the fifth control valve being respectively connected with the input end of the corresponding sprayer and the output end of each of the second flow passages; the fifth control valve being used for controlling on-off between the output end of each of the second flow passages and the corresponding sprayer.

[0015] Further, each first phase change thermal storage heat exchanger is provided with a first temperature detection device, each first temperature detection device is used to detect the temperature of the phase change material of the corresponding first phase change thermal storage heat exchanger; wherein each first temperature detection device is connected with the control device, and each first temperature detection device is used to send the detected temperature of the phase change material of the corresponding first phase change thermal storage heat exchanger to the control device.

[0016] Further, the control system further comprises: a second thermal storage heat exchange device, which is used for heat exchange and heat storage; the second thermal storage heat exchange device has at least two second phase change thermal storage heat exchangers, each second phase change thermal storage heat exchanger is provided with a third flow passage for refrigerant flow and a fourth flow passage for defrosting liquid flow; each third flow passage is connected with the condenser and the evaporator in an on-off manner respectively, and each fourth flow passage is connected with the supply device and the spraying device in an on-off manner respectively; the first thermal storage heat exchange device and the second thermal storage heat exchange device are arranged in parallel; the control device is used to obtain the current outdoor temperature, and selectively control the flow direction of the refrigerant and the defrosting liquid to the first thermal storage heat exchange device or the second thermal storage heat exchange device according to the current outdoor temperature.

[0017] According to another aspect of the present application: a refrigeration equipment is provided, comprising the above-mentioned control system.

[0018] According to another aspect of the present application: a control method is provided, which is applied to the above-mentioned control system, and the control method comprises: after the refrigeration mode is operated, the flow path of the refrigerant is controlled, and it is judged whether to switch to the defrosting mode; if the refrigerant flowing out of the condenser flows to the first thermal storage heat exchange device, the connection of each first flow passage with the condenser and the evaporator device is controlled in sequence, so that the phase change material of each first phase change thermal storage heat exchanger absorbs the heat released by the refrigerant flowing into the corresponding first flow passage in sequence and stores the heat; if the refrigeration mode is switched to the defrosting mode, the current temperature value of the phase change material of each first phase change thermal storage heat exchanger is obtained; according to the current temperature value of the phase change material of each first phase change thermal storage heat exchanger, the connection of each second flow passage with the supply device and the spraying device is adaptively controlled, so that the defrosting liquid flowing into at least one of the second flow passages absorbs the heat released by the corresponding phase change material, and the defrosting liquid after absorbing the heat flows to the spraying device.

[0019] Further, if the refrigeration mode is switched to the defrosting mode, and the method of adaptively controlling the connection of each second flow passage with the supply device and the spraying device according to the current temperature value of the phase change material of each first phase change energy storage heat exchanger, comprises: if the refrigeration mode is switched to the defrosting mode, comparing the current temperature value of the phase change material of each first phase change energy storage heat exchanger; and according to the current temperature value of each phase change material, sequentially and selectively controlling the connection of the corresponding second flow passage with the supply device and the spraying device from high to low.

[0020] Further, the method of sequentially and selectively controlling the connection of the corresponding second flow passage with the supply device and the spraying device according to the current temperature value of each phase change material, comprises: when one of each second flow passage is connected with the supply device and the spraying device, obtaining the current temperature of the corresponding phase change material; when the current temperature of the corresponding phase change material is less than the first preset temperature value, controlling the second flow passage to be disconnected with the supply device and the spraying device; and controlling another of each second flow passage to be connected with the supply device and the spraying device.

[0021] Further, the control method further comprises: after the defrosting mode is operated, detecting the current defrosting state of the evaporator device; when any one of each second flow passage is connected with the supply device and the spraying device, detecting that the evaporator device has completed defrosting, and then switching the defrosting mode to the refrigeration mode; when each second flow passage is disconnected with the supply device and the spraying device, detecting that the evaporator device has not completed defrosting, and then switching the defrosting mode to the refrigeration mode; when switching to the refrigeration mode, if the current temperature of the phase change material corresponding to at least one of each second flow passage is greater than or equal to a third preset temperature value, switching the refrigeration mode to the defrosting mode and continuing defrosting; and the third preset temperature value is greater than the first preset temperature value.

[0022] Further, the method of determining whether to switch to the defrosting mode after the refrigeration mode is operated, comprises: after the refrigeration mode is operated, determining whether the evaporator device meets the defrosting condition; if the evaporator device meets the defrosting condition, obtaining the current temperature value of the phase change material of each first phase change energy storage heat exchanger; if the current temperature value of the phase change material of each first phase change energy storage heat exchanger is less than the first preset temperature value, maintaining the refrigeration mode; and if the current temperature value of the phase change material of at least one of each first phase change energy storage heat exchanger is greater than the first preset temperature value, switching the refrigeration mode to the defrosting mode.

[0023] Further, if the evaporator device has two evaporators, the two evaporators are arranged in series; if the spraying device has two sprayers, the two evaporators and the two sprayers are arranged one-to-one, each sprayer is arranged above the corresponding evaporator, and each sprayer is connected to the output end of one of the second flow passages in an on-off manner; the control method further comprises: when one of the two evaporators reaches the defrosting condition and the refrigeration mode is switched to the defrosting mode, connecting the sprayer corresponding to the evaporator reaching the defrosting condition to the output end of one of the second flow passages; and when both of the two evaporators reach the defrosting condition and the refrigeration mode is switched to the defrosting mode, connecting the sprayers corresponding to the two evaporators to the output end of one of the second flow passages in turn.

[0024] Further, if the refrigerant flowing out of the condenser flows to the first energy storage heat exchange device, the method for sequentially controlling the connection between each first flow passage and the condenser and the evaporator device comprises: obtaining the current temperature value of the phase change material of each first phase change energy storage heat exchanger; and sequentially controlling the connection between each first flow passage and the condenser and the evaporator device from low to high according to the current temperature value of each phase change material.

[0025] Further, if the method for sequentially controlling the connection between each first flow passage and the condenser and the evaporator device from low to high according to the current temperature value of each phase change material comprises: obtaining the current temperature of the corresponding phase change material when one of the first flow passages is connected to the condenser and the evaporator device; controlling the first flow passage to be disconnected from the condenser and the evaporator device when the current temperature of the corresponding phase change material is greater than the second preset temperature value; and controlling another first flow passage to be connected to the condenser and the evaporator device.

[0026] Further, the control method is applied to the control system described above, and the control method further comprises: obtaining the current temperature of the phase change material corresponding to each first flow passage in the refrigeration mode; comparing the current temperature of the phase change material corresponding to each first flow passage after a preset time; and controlling the fourth control valve corresponding to the phase change material with the highest current temperature to be opened according to the comparison result.

[0027] Further, if the fourth control valve and the first phase change energy storage device each have N, N≥3; the control method further comprises: when the current temperature value of the phase change material of each first phase change energy storage device is greater than the second preset temperature value in the refrigeration mode, connecting the first flow passage of one of the first phase change energy storage devices corresponding to each fourth control valve in a closed state to the condenser and the evaporator device.

[0028] Further, the control method is applied to the control system, and the control method further comprises: after the refrigeration mode is started, acquiring a current outdoor temperature, and determining whether the refrigerant flowing out of the condenser flows to the first energy storage heat exchange device according to the current outdoor temperature; if the current outdoor temperature is greater than or equal to a fourth preset temperature value, controlling the refrigerant flowing out of the condenser to flow to the first energy storage heat exchange device; and if the current outdoor temperature is less than the fourth preset temperature value, controlling the refrigerant flowing out of the condenser to flow to the second energy storage heat exchange device.

[0029] Advantageous effects:

[0030] The application provides a control system, which comprises a condenser and an evaporator device connected in sequence, a supply device and a spraying device connected, and a first energy storage heat exchange device, the condenser is used for heat exchange with an external environment to reduce the temperature of refrigerant; the refrigerant after temperature reduction flows out from the output end of the condenser and flows to the evaporator device; the evaporator device is used for heat exchange with a target area to reduce the temperature of the target area to achieve the effect of refrigeration; meanwhile, the first energy storage heat exchange device is arranged between the condenser and the evaporator device, the first energy storage heat exchange device has at least two first phase change energy storage heat exchangers, each first phase change energy storage heat exchanger is arranged in parallel, each first phase change energy storage heat exchanger has phase change material for absorbing and releasing heat, and each first phase change energy storage heat exchanger further has a first flow passage for refrigerant flow and a second flow passage for defrosting liquid flow, and each first flow passage is connected to the condenser and the evaporator in an on-off mode; in addition, the supply device is used for conveying defrosting liquid to the spraying device; the spraying device is arranged above the evaporator device and is used for spraying and defrosting the evaporator device, and each second flow passage is connected to the supply device and the spraying device in an on-off mode; when the control system executes a refrigeration mode, each second flow passage is disconnected from the supply device and the spraying device, so that the defrosting liquid does not flow into each second flow passage, and each first flow passage is connected to the condenser and the evaporator device in sequence, so that the refrigerant flowing out of the condenser flows into each first flow passage in sequence and flows to the evaporator device; in this process, the phase change material of the first phase change energy storage heat exchanger absorbs the heat released by the refrigerant in the corresponding first flow passage in sequence and is stored; when the control system executes a defrosting mode, each first flow passage is disconnected from the condenser and the evaporator device, so that the refrigerant no longer flows to the evaporator device, and each second flow passage is connected to the supply device and the spraying device adaptively according to the current temperature of the phase change material of each first phase change energy storage heat exchanger, so that the defrosting liquid flowing out of the supply device flows into at least one second flow passage in sequence, the defrosting liquid flowing into the second flow passage exchanges heat with the phase change material of the first phase change energy storage heat exchanger corresponding to the second flow passage, so that the defrosting liquid absorbs the heat released by the phase change material, and the defrosting liquid after absorbing heat flows out of the second flow passage and flows to the spraying device to spray and defrost the evaporator device.And the first energy storage heat exchange device has at least two first phase change energy storage heat exchangers, and each first phase change energy storage heat exchanger has a phase change material with high specific heat capacity, a first flow passage for refrigerant flow, and a second flow passage for defrosting liquid flow, thereby in the refrigeration mode, the phase change material of each first phase change energy storage heat exchanger can efficiently absorb and store the waste heat of the refrigerant in turn, thereby improving the energy efficiency and capacity utilization of the system, reducing energy waste, and reducing energy consumption and operating costs of the system. At the same time, through the phase change material with high specific heat capacity in each first phase change energy storage heat exchanger, each first phase change energy storage heat exchanger can store more heat in the refrigeration mode, thereby ensuring that there is enough heat for defrosting. And the waste heat stored by the phase change material ensures the continuous and efficient supply of heat in the defrosting mode. At the same time, when the control system executes the defrosting mode, the system adaptively controls the flow direction of the defrosting liquid according to the current temperature of the phase change material of each first phase change energy storage heat exchanger, thereby ensuring that the defrosting liquid can flow through the first phase change energy storage heat exchanger with higher heat storage, so that the defrosting liquid can absorb enough heat for defrosting, improve the defrosting efficiency and thoroughness, and ensure the effective use of heat. And in the defrosting mode, the control system adaptively controls the flow direction of the defrosting liquid according to the current temperature of the phase change material in each first phase change energy storage heat exchanger, which also ensures that the heat can be released on demand and in order, avoiding the problem of insufficient heat in traditional systems. In addition, the system also monitors the temperature of the phase change material in each first phase change energy storage heat exchanger in real time, and dynamically adjusts the flow direction of the defrosting liquid, ensuring flexible response to heat demand under different conditions, especially when the condensation temperature is low and the frost layer is thick. This intelligent control mechanism realizes the continuous supply of heat in the defrosting mode and the continuous secondary subcooling of the refrigerant in the refrigeration mode, ensuring the maximum utilization efficiency of energy. By precisely controlling the storage and release of heat, the load fluctuation of the equipment under extreme conditions is reduced, the condenser, evaporator and other key components are protected, and the service life of the equipment is prolonged. And this intelligent control mechanism also ensures the stable operation of the system, reduces the failure caused by insufficient heat or incomplete defrosting, and improves the reliability and safety of the system. The control system of the present application effectively solves the technical problem that in the prior art, when the condensation temperature is low and the frost layer is thick, the heat stored in the heat exchanger may not meet the heat demand for defrosting, resulting in poor defrosting effect. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structure schematic diagram of the embodiment of the control system of the present application is shown;

[0032] Figure 2 The structure schematic diagram of the embodiment of the control system of the present application is shown;

[0033] Figure 3A structural schematic diagram of a refrigerant circulation loop in an embodiment of the control system of the present application is shown.

[0034] Figure 4 A structural schematic diagram of a defrosting liquid circulation loop in an embodiment of the control system of the present application is shown.

[0035] Figure 5 A flow schematic diagram of an embodiment of the control method of the present application is shown.

[0036] Among the above-mentioned drawings, the following reference signs are included:

[0037] 1, condenser; 2, evaporator device; 21, evaporator; 3, supply device; 31, water pan; 311, water leakage hole; 32, water pump; 33, water supply pipeline; 4, spraying device; 41, sprayer; 5, first energy storage heat exchange device; 51, first phase-change energy storage heat exchanger; 511, first flow-through part; 512, second flow-through part; 6, first control valve; 7, second control valve; 8, third control valve; 9, fourth control valve; 10, filtering device; 11, fifth control valve; 12, first temperature detection device; 13, second energy storage heat exchange device; 131, second phase-change energy storage heat exchanger; 1311, third flow-through part; 1322, fourth flow-through part; 14, sixth control valve; 15, seventh control valve; 16, eighth control valve; 17, ninth control valve; 18, second temperature detection device; 19, compressor; 20, throttling device. DETAILED DESCRIPTION

[0038] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should be considered as falling within the scope of protection of the present application.

[0039] Please refer to Figures 1 to 4As shown, according to the embodiment of the present application, the present application provides a control system, comprising: a condenser 1 and an evaporator device 2 connected in sequence; a supply device 3 and a spraying device 4 connected, the supply device 3 being used for conveying defrosting liquid to the spraying device 4; the spraying device 4 being arranged above the evaporator device 2, and the spraying device 4 being used for spraying defrosting to the evaporator device 2; a first energy storage heat exchange device 5 being used for heat exchange and heat storage; the first energy storage heat exchange device 5 having at least two first phase change energy storage heat exchangers 51, each first phase change energy storage heat exchanger 51 being provided with a first flow-through part 511 for refrigerant flow and a second flow-through part 512 for defrosting liquid flow; each first flow-through part 511 being connected to the condenser 1 and the evaporator 21 in an on-off manner respectively, and each second flow-through part 512 being connected to the supply device 3 and the spraying device 4 in an on-off manner respectively; wherein, in a refrigeration mode, each first flow-through part 511 is controlled to be connected to the condenser 1 and the evaporator device 2 in sequence, so that the phase change material of each first phase change energy storage heat exchanger 51 absorbs and stores the heat released by the refrigerant flowing into the corresponding first flow-through part 511 in sequence, and each second flow-through part 512 is controlled to be disconnected from the supply device 3 and the spraying device 4 respectively; in a defrosting mode, each first flow-through part 511 is controlled to be disconnected from the condenser 1 and the evaporator device 2 respectively, and each second flow-through part 512 is adaptively controlled to be connected to the supply device 3 and the spraying device 4 respectively according to the current temperature of the phase change material of each first phase change energy storage heat exchanger 51.

[0040] It can be seen that the control system provided by the application comprises: a condenser 1 and an evaporator device 2 connected in sequence, a supply device 3 and a spraying device 4 connected in parallel, and a first energy storage heat exchange device 5, the condenser 1 is used for heat exchange with an external environment to reduce the temperature of refrigerant; the refrigerant after temperature reduction flows out from the output end of the condenser and flows to the evaporator device 2; the evaporator device 2 is used for heat exchange with a target area to reduce the temperature of the target area, thereby achieving the effect of refrigeration. At the same time, the first energy storage heat exchange device 5 is arranged between the condenser 1 and the evaporator device 2, the first energy storage heat exchange device 5 has at least two first phase change energy storage heat exchangers 51, each first phase change energy storage heat exchanger 51 is arranged in parallel, each first phase change energy storage heat exchanger 51 has a phase change material for absorbing and releasing heat, and each first phase change energy storage heat exchanger 51 further has a first flow-through part 511 for refrigerant flow and a second flow-through part 512 for defrosting liquid flow, and each first flow-through part 511 is connected to the condenser 1 and the evaporator 21 in an on-off manner. In addition, the supply device 3 is used for delivering defrosting liquid to the spraying device 4; the spraying device 4 is arranged above the evaporator device 2, the spraying device 4 is used for spraying and defrosting the evaporator device 2, and each second flow-through part 512 is connected to the supply device 3 and the spraying device 4 in an on-off manner. When the control system executes a refrigeration mode, each second flow-through part 512 is disconnected from the supply device 3 and the spraying device 4, so that the defrosting liquid does not enter each second flow-through part 512, and each first flow-through part 511 is controlled to be connected to the condenser 1 and the evaporator device 2 in sequence, so that the refrigerant flowing out of the condenser 1 flows into each first flow-through part 511 in sequence and flows to the evaporator device 2. In this process, the phase change material of the first phase change energy storage heat exchanger 51 absorbs the heat released by the refrigerant in the corresponding first flow-through part 511 in sequence, thereby storing the heat. When the control system executes a defrosting mode, each first flow-through part 511 is disconnected from the condenser 1 and the evaporator device 2, so that the refrigerant no longer flows to the evaporator device 2, and the connection between each second flow-through part 512 and the supply device 3 and the spraying device 4 is adaptively controlled according to the current temperature of the phase change material of each first phase change energy storage heat exchanger 51, so that the defrosting liquid flowing out of the supply device 3 can flow into at least one second flow-through part 512 in each second flow-through part 512, so that the defrosting liquid flowing into the second flow-through part 512 exchanges heat with the phase change material of the first phase change energy storage heat exchanger 51 corresponding to the second flow-through part, so that the defrosting liquid absorbs the heat released by the phase change material, and the defrosting liquid after absorbing heat flows out of the second flow-through part 512 and flows to the spraying device 4, so that the spraying device 4 sprays and defrosts the evaporator device 2.

[0041] With such a structure, by setting the first energy storage heat exchange device 5, the refrigerant flowing out of the condenser 1 can be subjected to secondary subcooling, further reducing the temperature of the refrigerant, thereby improving the refrigeration effect, system refrigeration capacity and performance coefficient. And the first energy storage heat exchange device 5 has at least two first phase change energy storage heat exchangers 51, and each first phase change energy storage heat exchanger 51 has a phase change material with high specific heat capacity, a first flow passage 511 for refrigerant flow and a second flow passage 512 for defrosting liquid flow. In the refrigeration mode, the phase change material of each first phase change energy storage heat exchanger 51 can efficiently absorb and store the waste heat of the refrigerant in turn, thereby improving the energy efficiency and capacity utilization of the system, reducing energy waste, and reducing energy consumption and operating costs. At the same time, the phase change material with high specific heat capacity in each first phase change energy storage heat exchanger 51 can also store more heat in the refrigeration mode, thereby ensuring that there is enough heat for defrosting. In addition, the waste heat stored by the phase change material ensures continuous and efficient heat supply in the defrosting mode. At the same time, when the control system executes the defrosting mode, the system adaptively controls the flow direction of the defrosting liquid according to the current temperature of the phase change material of each first phase change energy storage heat exchanger 51, thereby ensuring that the defrosting liquid can flow through the first phase change energy storage heat exchanger 51 with higher heat storage, so that the defrosting liquid can absorb enough heat for defrosting, improving the defrosting efficiency and completeness, and ensuring the effective use of heat. In addition, in the defrosting mode, the control system adaptively controls the flow direction of the defrosting liquid according to the current temperature of the phase change material in each first phase change energy storage heat exchanger 51, which also ensures that the heat can be released on demand and in order, avoiding the problem of insufficient heat in traditional systems. In addition, the system also monitors the temperature of the phase change material in each first phase change energy storage heat exchanger 51 in real time, and dynamically adjusts the flow direction of the defrosting liquid, ensuring flexible response to heat demand under different conditions, especially when the condensation temperature is low and the frost layer is thick. This intelligent control mechanism realizes the continuous supply of heat in the defrosting mode and the continuous secondary subcooling of the refrigerant in the refrigeration mode, ensuring the maximum utilization efficiency of energy. By precisely controlling the storage and release of heat, the load fluctuation of the equipment under extreme conditions is reduced, the condenser, evaporator and other key components are protected, and the service life of the equipment is prolonged. In addition, this intelligent control mechanism also ensures the stable operation of the system, reduces the failure caused by insufficient heat or incomplete defrosting, and improves the reliability and safety of the system. The control system of the present application effectively solves the technical problem that in the prior art, when the condensation temperature is low and the frost layer is thick, the heat stored in the heat exchanger may not meet the heat demand for defrosting, resulting in poor defrosting effect.

[0042] Optionally, the refrigerant is refrigerant, and the defrosting liquid is defrosting water.

[0043] Further, the input end of the first flow-through part 511 is connected to the output end of the condenser 1 in an on-off manner, and the output end of the first flow-through part 511 is connected to the input end of the evaporator device 2 in an on-off manner. The input end of the second flow-through part 512 is connected to the output end of the supply device 3 in an on-off manner, and the output end of the second flow-through part 512 is connected to the spraying device 4 in an on-off manner.

[0044] Further, the first flow-through part 511 includes a plurality of first flow-through branches arranged in parallel, the input end of each first flow-through branch forms the input end of the first flow-through part 511, and the output end of each first flow-through branch forms the output end of the first flow-through part 511. In the refrigeration mode, when the refrigerant flows into the first phase change energy storage heat exchanger 51, it flows into each first flow-through branch respectively, then flows out through the output end of each first flow-through branch and converges to flow to the evaporator device 2. With such a structure, by arranging multiple parallel first flow-through branches, the refrigerant can transfer more heat to the phase change material in a shorter time, improving the heat absorption speed and total amount of the phase change material. This efficient heat absorption process ensures that the phase change material can store more heat in the refrigeration mode, providing sufficient heat reserve for subsequent defrosting operation. Moreover, the design of parallel branches increases the contact area between the refrigerant and the phase change material, making the heat exchange more sufficient and uniform, and increasing the contact area between the refrigerant and the phase change material, making the heat exchange more sufficient and uniform. Thus, the heat exchange efficiency between the refrigerant and the phase change material is improved.

[0045] Optionally, the first flow-through part 511 includes three first flow-through branches arranged in parallel.

[0046] Further, the second flow passage 512 comprises a plurality of second flow branches arranged in parallel, and the input end of each second flow branch forms the input end of the second flow passage 512. The output end of each second flow branch forms the output end of the second flow passage 512. In the defrosting mode, when the defrosting liquid flows into the first phase change energy storage heat exchanger 51, it flows into each second flow branch respectively, and then flows out through the output end of each second flow branch and converges to flow to the spraying device. By adopting such a structure, by arranging a plurality of parallel second flow branches, the contact area between the defrosting liquid and the phase change material is increased, so that the heat exchange is more sufficient and uniform. Thus, more heat can be transferred from the phase change material to the defrosting liquid in a shorter time, improving the overall heat exchange efficiency. Moreover, the design of parallel branches can avoid the problem of local temperature unevenness that may occur in a single channel, ensuring that the temperature distribution of the defrosting liquid in the entire heat exchanger is more uniform, thereby improving the defrosting effect. In addition, the defrosting liquid flows into the first phase change energy storage heat exchanger 51 through a plurality of parallel branches, which can absorb a large amount of stored heat in a short time, ensuring that the defrosting liquid obtains sufficient energy for defrosting. This efficient heat absorption process ensures that the defrosting liquid is fully heated before entering the spraying device, thereby improving the effect of spraying defrosting.

[0047] Further, the control system further comprises: a compressor 19, the compressor 19 being arranged between the input end of the condenser 1 and the output end of the evaporator device 2, the exhaust port of the compressor 19 being connected with the input end of the condenser 1, and the suction port of the compressor 19 being connected with the output end of the evaporator device 2.

[0048] Further, the control device further comprises: a throttling device 20, the throttling device 20 being arranged between the input end of the evaporator device 2 and the output end of each first flow passage 511, one end of the throttling device 20 being connected with the input end of the evaporator device 2, and the other end of the throttling device 20 being connected with the output end of each first flow passage 511 in an on-off manner; and the output end of each first flow passage 511 being connected with the evaporator device 2 in an on-off manner through the throttling device 20.

[0049] Further, as shown in Figures 1 to 3 , the compressor 19, the condenser 1, each first flow passage 511, the throttling device 20 and the evaporator device 2 form a refrigerant circulation loop. When in the defrosting mode, the compressor 19 is in standby state and does not work.

[0050] Further, at least part of the supply device 3 is used for collecting and recycling the defrosting liquid flowing from the evaporator device 2.

[0051] Further, as shown in Figure 1 , Figure 2 , and Figure 4As shown, the supply device 3, each second flow passage 512 and the spraying device 4 form a defrosting liquid circulation loop.

[0052] Specifically, the control system further comprises a control device for determining whether to switch from the refrigeration mode to the defrosting mode and obtaining the current temperature of the phase change material of each first phase change thermal storage heat exchanger 51, and adaptively controlling the on-off of each first flow passage 511 with the condenser 1 and the evaporator device 2 respectively, and the on-off of each second flow passage 512 with the supply device 3 and the spraying device 4 respectively according to the determination result and the current temperature of each phase change material. By setting the control device, the system can adaptively control the on-off of each first flow passage 511 with the condenser 1 and the evaporator device 2 respectively, and the on-off of each second flow passage 512 with the supply device 3 and the spraying device 4 according to the current state and the temperature of each phase change material. This intelligent control significantly reduces the need for manual intervention, improves the automation level and operation efficiency of the system. At the same time, the flexibility of the system is also enhanced, ensuring that it is always in the best operating state and can effectively cope with various complex working conditions, thereby improving stability and reliability. In summary, by introducing the control device, the system realizes intelligent mode switching, accurate temperature monitoring and adaptive control, significantly improving energy utilization efficiency, defrosting effect and overall stability of the system.

[0053] Specifically, as shown in the figure, Figures 1 to 3 The control system further comprises at least two first control valves 6 and a second control valve 7. Each first control valve 6 is arranged one-to-one with each first phase change thermal storage heat exchanger 51. The input end of each first control valve 6 is connected with the output end of the corresponding first flow passage 511 and the condenser 1 respectively. Each first control valve 6 is used to control the on-off between the corresponding first flow passage 511 and the condenser 1. The input end of the second control valve 7 is connected with the output end of each first flow passage 511 respectively, and the output end of the second control valve 7 is connected with the input end of the evaporator device 2. The second control valve 7 is used to control the on-off between each first flow passage 511 and the evaporator device 2. With such a structure, by setting the first control valve 6 between each first flow passage 511 and the condenser 1, the system can realize that the refrigerant enters each first flow passage 511 in turn, thereby accurately controlling the flow path of the refrigerant, optimizing the heat exchange efficiency and improving the overall thermal management performance. At the same time, by setting the second control valve 7, the system can quickly adjust the flow with the evaporator device 2. This instant response capability enables the system to quickly adjust the working state when the load changes, improving the overall response speed.

[0054] Further, each of the first control valve 6 and the second control valve 7 is connected with a control device, and the control device adaptively controls the opening and closing of each of the first control valve 6 and the second control valve 7 according to the operation mode of the system and the current temperature of the phase change material of each of the first phase change thermal storage heat exchanger 51.

[0055] Optionally, in the refrigeration mode, the second control valve 7 is controlled to be opened, and the current temperature of the phase change material of each of the first phase change thermal storage heat exchanger 51 is obtained. According to the current temperature of the phase change material of each of the first phase change thermal storage heat exchanger 51, the corresponding first control valve 6 is sequentially controlled to be opened from low to high. When the current temperature of the phase change material is controlled to be at the lowest first phase change thermal storage heat exchanger 51 corresponding to the first control valve 6, the first flow passage 511 of the first phase change thermal storage heat exchanger 51 is connected with the condenser 1 and the evaporator device 2 respectively, and the phase change material of the first phase change thermal storage heat exchanger 51 absorbs and stores the heat released by the refrigerant. When the phase change material of the first phase change thermal storage heat exchanger 51 is completely melted (i.e. when the heat absorption is completed), the first control valve 6 corresponding to the first phase change thermal storage heat exchanger 51 is controlled to be closed. Then, the current temperature of the phase change material is controlled to be at the second lowest first phase change thermal storage heat exchanger 51 corresponding to the first control valve 6. Then, the above process is sequentially repeated. When switching from the refrigeration mode to the defrosting mode, each of the first control valve 6 and the second control valve 7 is controlled to be in the closed state.

[0056] When the current temperature of the phase change material of each of the first phase change thermal storage heat exchanger 51 is consistent, the opening and closing of the first control valve 6 is sequentially controlled according to the installation position of each of the first phase change thermal storage heat exchanger 51 or the preset designation or the code of each of the first phase change thermal storage heat exchanger 51.

[0057] Specifically, as Figure 1 , Figure 2 and Figure 4As shown, the control system further comprises: a third control valve 8 and at least two fourth control valves 9, the input end of the third control valve 8 is connected with the output end of the supply device 3, the output end of the third control valve 8 is respectively connected with the input end of each second flow passage 512; the third control valve 8 is used for controlling the on-off between the supply device 3 and the input end of each second flow passage 512; each fourth control valve 9 is arranged corresponding to each first phase change energy storage heat exchanger 51, each fourth control valve 9 is arranged between the third control valve 8 and the input end of the corresponding second flow passage 512, and each fourth control valve 9 is connected with the input end of the corresponding second flow passage 512 and the output end of the third control valve 8. By adopting such a structure, the system can quickly adjust the flow between the supply device 3 and the third control valve 8 by arranging the third control valve 8. Such an instant response capability enables the system to quickly adjust the working state when the load changes, thereby improving the overall response speed. At the same time, by arranging the fourth control valve 9 between each second flow passage 512 and the fourth control valve 9, the system can realize that the refrigerant enters each second flow passage 512 in turn, accurately control the flow path of the defrosting liquid, optimize the heat exchange efficiency, and improve the overall thermal management performance. In addition, arranging a total valve (i.e. the third control valve 8) and a sub-valve (i.e. the fourth control valve 9) at the output end of each second flow passage 512 can effectively prevent the defrosting liquid from entering the second flow passage 512 in the refrigeration mode.

[0058] Further, the third control valve 8 and each fourth control valve 9 are connected with a control device, and the control device adaptively controls the opening and closing of the third control valve 8 and each fourth control valve 9 according to the operating mode of the system and the current temperature of the phase change material of each first phase change energy storage heat exchanger 51.

[0059] Optionally, in the refrigeration mode, the third control valve 8 and each fourth control valve 9 are controlled to be in a closed state, and it is detected in real time whether the phase change material of each first phase change energy storage heat exchanger 51 is completely melted.

[0060] When only the phase change material of one of the first phase change energy storage heat exchangers 51 is completely melted, the first phase change energy storage heat exchanger 51 is selected as the defrosting energy storage unit, and the fourth control valve 9 of the first phase change energy storage heat exchanger 51 is controlled to be opened.

[0061] When the phase change materials of at least two of the first phase change energy storage heat exchangers 51 are completely melted, the temperatures of the phase change materials of the at least two first phase change energy storage heat exchangers 51 are judged, the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest temperature is selected as the defrosting energy storage unit, and the fourth control valve 9 of the first phase change energy storage heat exchanger 51 is controlled to be opened. The other fourth control valves 9 are in a closed state.

[0062] This can be understood as follows: when the phase change material of the first phase change energy storage heat exchanger 51 in each of the first phase change energy storage heat exchangers 51 has completely melted, the first phase change energy storage heat exchanger 51 is selected as the defrosting energy storage unit. After a period of time, when the phase change material of the second phase change energy storage heat exchanger 51 in each of the first phase change energy storage heat exchangers 51 has completely melted, the temperature of the phase change material of the two first phase change energy storage heat exchangers 51 is judged, and the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest temperature is selected as the defrosting energy storage unit. The fourth control valve 9 is in the open state when the first phase change energy storage heat exchanger 51 is selected as the defrosting energy storage unit.

[0063] In the cooling mode, when the phase change materials of each first phase change energy storage heat exchanger 51 are completely melted, the first control valve 6 corresponding to the first phase change energy storage heat exchanger 51 adjacent to the first phase change energy storage heat exchanger 51 selected as the defrosting energy storage unit is opened, thereby facilitating the flow of refrigerant.

[0064] For example, such as Figure 2 As shown, the first phase change energy storage heat exchangers 51 are arranged sequentially from top to bottom. In cooling mode, when the phase change material of each first phase change energy storage heat exchanger 51 is completely melted, the first control valve 6 corresponding to the lower first phase change energy storage heat exchanger 51 selected as the defrost energy storage unit is opened. If the first phase change energy storage heat exchanger 51 selected as the defrost energy storage unit is the lowest part, the first control valve 6 corresponding to the uppermost first phase change energy storage heat exchanger 51 is opened.

[0065] When switching from cooling mode to defrosting mode, the third control valve 8 is opened, allowing the defrosting liquid flowing from the supply device 3 to pass sequentially through the third control valve 8 and the open fourth control valve 9 into the second flow section 512 of the first phase change energy storage heat exchanger 51, where it absorbs the heat released by the phase change material of the first phase change energy storage heat exchanger 51. After absorbing the heat, the defrosting liquid flows to the spray device 4, causing the spray device 4 to perform spray defrosting.

[0066] When the phase change material has finished releasing heat (i.e., when the phase change material becomes solid), the fourth control valve 9, which was in the open state, switches to the closed state. Then, based on the current temperature of the phase change material in the other first phase change energy storage heat exchangers 51, the corresponding fourth control valves 9 are opened sequentially from high to low temperature. When one fourth control valve 9 is opened, the other fourth control valves 9 remain closed. In defrosting mode, if defrosting is detected as complete, the third control valve 8 and all fourth control valves 9 are closed, and the system switches to cooling mode.

[0067] In the defrosting mode, if the phase change material of each first phase change energy storage heat exchanger 51 releases all the heat and it is detected that the defrosting is not completed, the third control valve 8 and each fourth control valve 9 are controlled to be in the closed state, and the system is switched to the refrigeration mode.

[0068] Specifically, as shown in Figure 1 , the control system further comprises a filtering device 10, which is arranged between the supply device 3 and the first energy storage heat exchanger 5, and is connected to the input end of the supply device 3 and the input end of each second flow passage 512 respectively; the filtering device 10 is used for filtering the defrosting liquid. By adopting such a structural arrangement, the defrosting liquid can be filtered by the filtering device 10, preventing impurities from blocking each control valve, each second flow passage 512 of the first energy storage heat exchanger 5, and the spraying device 4, thereby reducing the defrosting effect.

[0069] Specifically, as shown in Figure 1 , Figure 2 , and Figure 4 , the evaporator device 2 comprises at least one evaporator 21, and the input end of the evaporator 21 is connectable to the output end of each first flow passage 511; the supply device 3 comprises at least one water pan 31, which is arranged one-to-one corresponding to the evaporator 21, and is arranged below the corresponding evaporator 21, and is used for collecting and storing the defrosting liquid flowing down from the evaporator 21; the output end of the water pan 31 is connectable to the input end of each second flow passage 512. By adopting such a structural arrangement, each evaporator 21 is arranged one-to-one corresponding to its corresponding water pan 31, ensuring that the defrosting liquid can be accurately collected and redistributed. Such a one-to-one design improves the accuracy and reliability of the system, avoiding waste and uneven distribution of the defrosting liquid. By arranging the water pan 31 below the evaporator 21, the melted frost water can be effectively collected, preventing water droplets from falling or accumulating and affecting the operation of the system. Moreover, the water pan 31 is not only used for collecting the defrosting liquid flowing down from the evaporator 21, but also can store these liquids for reuse when needed. Such a design ensures the effective reuse of the defrosting liquid, reduces the additional demand for defrosting liquid, and improves the overall energy efficiency of the system.

[0070] Optionally, as shown in Figure 1 , the evaporator 21 has two, and the two evaporators 21 are arranged in series, and the input end of the evaporator 21 close to the output end of each first flow passage 511 forms the input end of the evaporator device 2. One water pan 31 is arranged below each evaporator 21. Each water pan 31 collects and stores the defrosting liquid flowing down from the corresponding evaporator 21. In actual process, the number of evaporators 21 is not limited, and by arranging multiple evaporators 21, the system can be applied to multi-temperature zone cold storage.

[0071] Specifically, as shown in Figure 1 , Figure 2 and Figure 4 , the supply device 3 further comprises: at least one water pump 32, the water pump 32 is arranged one-to-one with the water pan 31, the input end of the water pump 32 is connected with the output end of the corresponding water pan 31, and the output end of the water pump 32 is connected with the input end of each second flow-through part 512 in an on-off manner. With such a structure, by arranging the water pump 32 and arranging the water pump 32 one-to-one with the water pan 31, it is ensured that the defrosting liquid in the corresponding water pan 31 can be transported from the water pan 31 to the corresponding second flow-through part 512 as needed, and the flow of the defrosting liquid can also be accurately controlled by the water pump 32.

[0072] Further, the water pump 32 is connected with a control device, and the control device is used to control the start and stop of the water pump.

[0073] Optionally, as shown in Figure 1 , the water pump 32 has two, and the two water pumps 32 are arranged one-to-one with the two water pans 31, and the output ends of the two water pumps 32 are respectively connected with the input ends of each second flow-through part 512 in an on-off manner.

[0074] Further, as shown in Figure 1 , the water pan 31 is provided with a water leakage hole 311, and the water leakage hole 311 forms the output end of the water pan 31.

[0075] Specifically, as shown in Figure 1 , Figure 2 and Figure 4 , the supply device 3 further comprises: a water replenishing pipeline 33, the water replenishing pipeline 33 is connected with the water pan 31, and the water replenishing pipeline 33 is used to replenish the defrosting liquid for the water pan 31. With such a structure, by arranging the water replenishing pipeline 33, the water pan 31 can be replenished with defrosting liquid, preventing the water pan 31 from having too little defrosting liquid.

[0076] Optionally, the water pan 31 is provided in plurality, and the output end of the water replenishing pipeline 33 is connected with each water pan 31.

[0077] Specifically, as shown in Figure 1 , Figure 2 and Figure 4As shown, the spraying device 4 comprises: at least one sprayer 41, the sprayer 41 is arranged one-to-one with the evaporator 21, the sprayer 41 is arranged above the corresponding evaporator 21, and the sprayer 41 sprays defrosting liquid onto the corresponding evaporator 21 for defrosting; the input end of the sprayer 41 is connected to the output end of each second flow passage 512 in an on-off manner. With such a structure, each sprayer 41 is arranged one-to-one with the corresponding evaporator 21, ensuring that the defrosting liquid can be accurately sprayed onto the evaporator surface that needs to be defrosted. Thus, the accuracy and efficiency of spraying are improved, and the waste and uneven distribution of defrosting liquid are avoided. The sprayer 41 is arranged above the evaporator 21, which can ensure that the defrosting liquid uniformly covers the entire evaporator surface, improving the defrosting effect. It ensures that all frost layers can be effectively melted, improving the thoroughness of defrosting. In addition, the connection state of each sprayer 41 and the second flow passage 512 is selectively controlled according to actual needs, ensuring that the defrosting liquid is distributed to the corresponding evaporator 21 as needed. Thus, the defrosting efficiency is improved.

[0078] Optionally, the water pan 31 and the water pump 32 are arranged one-to-one with the sprayer 41. Figure 1 As shown, the sprayer 41 has two, when one of the two sprayers 41 sprays defrosting, the corresponding water pump 32 is turned on, which transports the defrosting liquid in the corresponding water pan 31 into the sprayer 41.

[0079] Optionally, when at least two of the plurality of evaporators 21 reach the defrosting condition, the second evaporator 21 is defrosted after the first evaporator 21 is defrosted.

[0080] Specifically, as shown in Figure 1 , Figure 2 and Figure 4 , the control system further comprises: at least one fifth control valve 11, the fifth control valve 11 is arranged one-to-one with the sprayer 41, and the fifth control valve 11 is connected to the input end of the corresponding sprayer 41 and the output end of each second flow passage 512; the fifth control valve 11 is used to control the on-off between the output end of each second flow passage 512 and the corresponding sprayer 41. With such a structure, by setting the fifth control valve 11, the flow direction of the defrosting liquid can be independently controlled, ensuring that the defrosting liquid can be accurately sprayed into the corresponding sprayer 41 of the evaporator 21 that needs to be defrosted, thereby improving the accuracy and efficiency of spraying, avoiding the waste and uneven distribution of defrosting liquid, and ensuring that each evaporator 21 can obtain sufficient defrosting liquid for effective defrosting.

[0081] Specifically, as shown in Figures 1 to 4As shown, each first phase change thermal storage heat exchanger 51 is provided with a first temperature detection device 12, and each first temperature detection device 12 is configured to detect the temperature of the phase change material of the corresponding first phase change thermal storage heat exchanger 51. Each first temperature detection device 12 is connected to the control device, and each first temperature detection device 12 is configured to send the detected temperature of the phase change material of the corresponding first phase change thermal storage heat exchanger 51 to the control device. With such a configuration, the first temperature detection device 12 can detect the temperature of the phase change material of the corresponding first phase change thermal storage heat exchanger 51, so that the control device can determine the state of the phase change material of the corresponding first phase change thermal storage heat exchanger 51, thereby facilitating the control device to perform corresponding control.

[0082] Further, the first temperature detection device 12 includes at least one first temperature sensor.

[0083] Optionally, in addition to the first temperature detection device 12 on each first phase change thermal storage heat exchanger 51, a capacitance sensor can also be provided on each first phase change thermal storage heat exchanger 51 to detect the state of the phase change material of each first phase change thermal storage heat exchanger 51, so as to determine whether the phase change material of each first phase change thermal storage heat exchanger 51 is in a completely solidified state, a completely melted state, or a solid-liquid mixed state.

[0084] Specifically, as shown in FIG. 1, the first temperature detection device 12 includes a first temperature sensor 121 and a first temperature sensor 122. Figure 1As shown, the control system further comprises: a second energy storage heat exchange device 13 and a control device for heat exchange and heat storage; the second energy storage heat exchange device 13 has at least two second phase change energy storage heat exchangers 131, each of which is provided with a third flow-through part 1311 for refrigerant flow and a fourth flow-through part 1322 for defrosting liquid flow; each third flow-through part 1311 is connected to the condenser 1 and the evaporator 21 in an on-off manner, respectively, and each fourth flow-through part 1322 is connected to the supply device 3 and the spraying device 4 in an on-off manner, respectively; the first energy storage heat exchange device 5 and the second energy storage heat exchange device 13 are arranged in parallel; the control device is used to obtain the current outdoor temperature, and selectively control the flow direction of the refrigerant and the defrosting liquid to the first energy storage heat exchange device 5 or the second energy storage heat exchange device 13 according to the current outdoor temperature. With such a structure, by arranging the first energy storage heat exchange device 5 and the second energy storage heat exchange device 13, and selectively controlling the flow direction of the refrigerant and the defrosting liquid to the first energy storage heat exchange device 5 or the second energy storage heat exchange device 13 according to the current outdoor temperature by the control device, the outdoor temperature can be used to control the flow direction of the refrigerant and the defrosting liquid, and different phase change temperatures can be used to effectively recover the condenser waste heat and ensure the best heat recovery effect. Moreover, by automatically switching between the first energy storage heat exchange device 5 and the second energy storage heat exchange device 13 according to the environmental temperature, the load demand and the phase change material temperature, the system can adapt to different seasons and ensure that the system can effectively perform waste heat defrosting and refrigerant secondary supercooling under different environments, maximizing the energy utilization efficiency.

[0085] Optionally, the phase change temperature range of the phase change material of the first energy storage heat exchange device 5 and the phase change temperature range of the phase change material of the second energy storage heat exchange device 13 are different, so that the system is an energy storage system using double phase change materials, thereby adapting to the temperature of the refrigerant flowing out of the condenser 1 under different environments and optimizing the heat storage efficiency.

[0086] Further, as shown, Figure 1 the control system further comprises: at least two sixth control valves 14 and a seventh control valve 15, each sixth control valve 14 is arranged one-to-one with each second phase change energy storage heat exchanger 131, and each sixth control valve 14 is connected to the input end of the corresponding third flow-through part 1311 and the output end of the condenser 1, respectively; each sixth control valve 14 is used to control the on-off connection between the corresponding third flow-through part 1311 and the condenser 1; the input end of the seventh control valve 15 is connected to the output end of each third flow-through part 1311, and the output end of the seventh control valve 15 is connected to the input end of the evaporator device 2; the seventh control valve 15 is used to control the on-off connection between each third flow-through part 1311 and the evaporator device 2.

[0087] Optionally, in cooling mode, when controlling the refrigerant flow to the first energy storage heat exchanger 5, the sixth control valve 14 and the seventh control valve 15 are controlled to be closed. When controlling the refrigerant flow to the second energy storage heat exchanger 13, the first control valve 6 and the second control valve 7 are controlled to be closed. The process of controlling the sixth control valve 14 and the seventh control valve 15 is the same as the process of controlling the first control valve 6 and the second control valve 7 described above, and will not be repeated here.

[0088] Furthermore, such as Figure 1 As shown, the control system further includes: an eighth control valve 16 and at least two ninth control valves 17. The input end of the eighth control valve 16 is connected to the output end of the supply device 3, and the output end of the eighth control valve 16 is connected to the input end of each of the fourth flow sections 1322. The eighth control valve 16 is used to control the on / off connection between the supply device 3 and the input ends of each of the fourth flow sections 1322. Each ninth control valve 17 is provided in a one-to-one correspondence with each of the second phase change energy storage heat exchangers 131. Each ninth control valve 17 is provided between the eighth control valve 16 and the input end of the corresponding fourth flow section 1322, and each ninth control valve 17 is connected to the input end of the corresponding fourth flow section 1322 and the output end of the eighth control valve 16.

[0089] Furthermore, the control system also includes: each of the second phase change energy storage heat exchangers 131 is provided with a second temperature detection device 18, which is used to detect the temperature of the phase change material of the corresponding second phase change energy storage heat exchanger 131; wherein, each of the second temperature detection devices 18 is connected to the control device, and each of the second temperature detection devices 18 sends the detected temperature of the phase change material of the corresponding second phase change energy storage heat exchanger 131 to the control device.

[0090] Optionally, in defrosting mode, when the defrosting fluid is directed to the first energy storage heat exchanger 5, the eighth control valve 16 and each of the ninth control valves 17 are closed. When the defrosting fluid is directed to the second energy storage heat exchanger 13, the third control valve 8 and each of the fourth control valves 9 are closed. The process of controlling the eighth control valve 16 and each of the ninth control valves 17 is the same as the process of controlling the third control valve 8 and each of the fourth control valves 9 described above, and will not be repeated here.

[0091] Optionally, the volume of the phase change material stored in each of the first phase change energy storage heat exchangers 51 can be different or the same; and the volume of the phase change material stored in each of the second phase change energy storage heat exchangers 131 can be different or the same.

[0092] Optionally, the volume size and the number of the single phase change energy storage heat exchangers can be optimized according to the defrosting frequency and the refrigerant temperature at the outlet of the condenser by experimental test data before matching the phase change energy storage heat exchangers, so as to avoid the extreme situation (i.e., all the phase change energy storage heat exchangers have been completely melted but there is no defrosting demand, or all the phase change energy storage heat exchangers have been completely solidified but the defrosting is not complete).

[0093] The present application provides a refrigeration equipment, comprising the control system of the above embodiment. With such a structure, the refrigeration equipment has the same advantages as the control system of the above embodiment, which will not be repeated here.

[0094] Optionally, the refrigeration equipment is a cold storage.

[0095] The present application provides a control method applied to the control system of the above embodiment, as shown in the above embodiment, the control method comprises the following steps. Figure 5

[0096] S11, after the refrigeration mode is running, the flow path of the refrigerant is controlled, and it is judged whether to switch to the defrosting mode.

[0097] S12, if the refrigerant flowing out of the condenser 1 flows to the first energy storage heat exchanger 5, the connection of each first flow part 511 with the condenser 1 and the evaporator device 2 is controlled in turn, so that the phase change material of each first phase change energy storage heat exchanger 51 absorbs the heat released by the refrigerant flowing into the corresponding first flow part 511 in turn and stores it.

[0098] S13, if the refrigeration mode is switched to the defrosting mode, the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51 is obtained.

[0099] S14, according to the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51, the connection of each second flow part 512 with the supply device 3 and the spraying device 4 is adaptively controlled, so that the defrosting liquid flowing into at least one second flow part 512 of each second flow part 512 absorbs the heat released by the corresponding phase change material, and the defrosting liquid after absorbing the heat flows to the spraying device 4.

[0100] ​With such a control method, by sequentially controlling the connection of each first flow-through part 511 with the condenser 1 and the evaporator device 2, and further in the refrigeration mode, the phase change material of each first phase change energy storage heat exchanger 51 can sequentially and efficiently absorb and store the waste heat of the refrigerant, thereby improving the energy efficiency and capacity utilization of the system, reducing energy waste, and reducing energy consumption and operating costs. At the same time, each first phase change energy storage heat exchanger 51 can store more heat in the refrigeration mode, thereby ensuring that there is enough heat to defrost. And the system ensures continuous and efficient heat supply in the defrosting mode by the phase change material storing the waste heat. And by the phase change material of each first phase change energy storage heat exchanger 51 absorbing the heat released by the refrigerant, the refrigerant flowing out of the condenser 1 can be further subcooled, further reducing the temperature of the refrigerant, thereby improving the refrigeration effect, system refrigeration capacity and performance coefficient. At the same time, in the defrosting mode, the system adaptively controls the flow direction of the defrosting liquid according to the current temperature of the phase change material of each first phase change energy storage heat exchanger 51, thereby ensuring that the defrosting liquid can flow through the second flow-through part 512 of the first phase change energy storage heat exchanger 51 that stores more heat, so that the defrosting liquid can absorb enough heat for defrosting, improving the defrosting efficiency and completeness, and ensuring efficient use of heat. And in the defrosting mode, the control system adaptively controls the flow direction of the defrosting liquid according to the current temperature of the phase change material in each first phase change energy storage heat exchanger 51, which also ensures that heat can be released on demand and in an orderly manner, avoiding the problem of insufficient heat in traditional systems. In addition, by monitoring the temperature of the phase change material in each first phase change energy storage heat exchanger 51 in real time, the flow direction of the defrosting liquid can be dynamically adjusted, thereby ensuring flexible response to heat demand under different conditions, especially when the condensing temperature is low and the frost layer is thick. This intelligent control mechanism realizes continuous heat supply in the defrosting mode and continuous subcooling of the refrigerant in the refrigeration mode, ensuring maximum energy utilization efficiency. By precisely controlling the storage and release of heat, the load fluctuation of the equipment under extreme conditions is reduced, the condenser, evaporator and other key components are protected, and the service life of the equipment is prolonged. And this intelligent control mechanism also ensures stable operation of the system, reduces failures caused by insufficient heat or incomplete defrosting, and improves the reliability and safety of the system. The control method of the present application effectively solves the technical problem that in the prior art, when the condensing temperature is low and the frost layer is thick, the heat stored in the heat exchanger may not meet the heat demand for defrosting, resulting in poor defrosting effect.

[0101] Specifically, if the refrigeration mode is switched to the defrosting mode, and the method of adaptively controlling the connection of each second flow-through part 512 with the supply device 3 and the spraying device 4 according to the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51, comprises: if the refrigeration mode is switched to the defrosting mode, comparing the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51; and according to the current temperature value of each phase change material, selectively controlling the connection of the corresponding second flow-through part 512 with the supply device 3 and the spraying device 4 in turn from high to low. By using such a control method, the connection of the corresponding second flow-through part 512 with the supply device 3 and the spraying device 4 is selectively controlled in turn from high to low according to the current temperature value of each phase change material, which ensures that the defrosting liquid can absorb enough heat. This way of distributing heat on demand avoids energy waste and improves the energy utilization rate of the system. And by gradually extracting heat from the phase change material with the highest temperature, the system can extract the most heat in the shortest time, ensuring that the defrosting liquid obtains enough heat to melt the frost layer, making the defrosting process fast and thorough, thereby improving the defrosting effect. In addition, the control system can dynamically adjust the on-off state of each second flow-through part 512 according to real-time temperature data, ensuring that the best defrosting effect can be provided under any conditions.

[0102] Optionally, in the refrigeration mode, when one of the first flow-through parts 511 is connected with the condenser 1 and the evaporator device 2 respectively, the other first flow-through parts 511 are all disconnected with the condenser 1. In the defrosting mode, when one of the second flow-through parts 512 is connected with the spraying device 4 and the supply device 3 respectively, the other second flow-through parts 512 are all disconnected with the supply device 3.

[0103] Specifically, the method of selectively controlling the connection of the corresponding second flow passage 512 with the supply device 3 and the spraying device 4 in order from high to low according to the current temperature value of each phase change material, comprising: obtaining the current temperature of the corresponding phase change material when one of each second flow passage 512 is connected with the supply device 3 and the spraying device 4 respectively; when the current temperature of the corresponding phase change material is less than the first preset temperature value, controlling the second flow passage 512 to be disconnected with the supply device 3 and the spraying device 4 respectively; and controlling another of each second flow passage 512 to be connected with the supply device 3 and the spraying device 4 respectively. By using such a control method, the flow of defrosting liquid is preferentially selected in the phase change energy storage heat exchanger with higher temperature, ensuring that the defrosting liquid can absorb enough heat. Thus, the energy utilization rate of the system is improved. Moreover, the high-temperature phase change material preferentially participates in heat exchange, ensuring that the defrosting liquid obtains enough heat for melting the frost layer. Thus, the defrosting effect is improved. In addition, the on-off state of each second flow passage 512 is dynamically adjusted according to real-time temperature data, ensuring that the best defrosting effect can be provided under any condition. Such flexibility enables the system to cope with various complex working conditions, enhancing the stability and reliability of the system.

[0104] The first preset temperature value refers to the lower limit of the phase change temperature range of the phase change material. When the current temperature of the phase change material is less than the first preset temperature value, it indicates that the phase change material has completely solidified.

[0105] Optionally, when one of each second flow passage 512 is connected with the supply device 3 and the spraying device 4 respectively, the other second flow passages 512 are all in a disconnected state with the supply device 3, so that the defrosting liquid cannot enter the other second flow passages 512.

[0106] Specifically, the control method further comprises: after the defrosting mode is run, detecting the current defrosting state of the evaporator device 2; when any one of the second flow passages 512 is connected with the supply device 3 and the spraying device 4 respectively, and it is detected that the evaporator device 2 has completed defrosting, switching the defrosting mode to the refrigeration mode; when all the second flow passages 512 are disconnected with the supply device 3 and the spraying device 4 respectively, and it is detected that the evaporator device 2 has not completed defrosting, switching the defrosting mode to the refrigeration mode; when switching to the refrigeration mode, if the current temperature of the phase change material corresponding to at least one of the second flow passages 512 is greater than or equal to a third preset temperature value, switching the refrigeration mode to the defrosting mode and continuing defrosting; and the third preset temperature value is greater than the first preset temperature value. By using such a control method, after the defrosting mode is run, the current defrosting state of the evaporator device 2 is detected in real time, so that the defrosting progress can be understood in time. This real-time monitoring mechanism improves the response speed of the system and ensures the efficiency and thoroughness of the defrosting operation. When it is detected that the evaporator has completed defrosting, the system immediately switches back to the refrigeration mode, avoiding unnecessary defrosting operation and energy waste. This precise control reduces the running time of the equipment in the defrosting mode, prolongs the service life of the equipment and reduces energy consumption. At the same time, the system intelligently judges when to re-enter the defrosting mode according to the temperature of the phase change material, ensuring that each defrosting can utilize sufficient heat and improving the defrosting efficiency. In addition, the working mode is dynamically adjusted by real-time temperature data, so that the system is always in the best operating state. Thus, the flexibility, stability and reliability of the system are increased.

[0107] The third preset temperature value is greater than the first preset temperature value to ensure that the defrosting mode is started again only when the phase change material has stored enough heat, thereby ensuring the thoroughness and efficiency of the defrosting effect.

[0108] Optionally, in the defrosting mode, the defrosting condition of the evaporator device 2 is detected in real time. When any one of the second flow passages 512 is connected with the supply device 3 and the spraying device 4 respectively, and it is detected that the evaporator device 2 has completed defrosting, each of the second flow passages 512 is disconnected with the supply device 3 and the spraying device 4 respectively, and the defrosting mode is switched to the refrigeration mode. When each of the second flow passages 512 is connected with the supply device 3 and the spraying device 4 respectively, and the current temperature of the phase change material corresponding to each of the second flow passages 512 is less than the first preset temperature value, it is detected that the evaporator device 2 has not completed defrosting, the defrosting mode is suspended, the defrosting mode is switched to the refrigeration mode, and the defrosting mode is switched to the defrosting mode again when the current temperature of at least one of the phase change materials corresponding to each of the second flow passages 512 is greater than or equal to the third preset temperature value.

[0109] Specifically, the method for determining whether to switch to the defrosting mode after the refrigeration mode is running, comprising: determining whether the evaporator device 2 reaches the defrosting condition after the refrigeration mode is running; if the evaporator device 2 reaches the defrosting condition, obtaining the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51; if the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51 is less than the first preset temperature value, maintaining the refrigeration mode; if the current temperature value of the phase change material of at least one of the first phase change energy storage heat exchangers 51 is greater than the first preset temperature value, switching the refrigeration mode to the defrosting mode. By using such a control method, in the case that the evaporator device 2 reaches the defrosting condition, it is determined by the current temperature of the phase change material when it is necessary to enter the defrosting mode, ensuring that sufficient heat is used for defrosting each time, and the defrosting efficiency is improved. And it avoids invalid defrosting operation, reduces energy waste.

[0110] Further, when the evaporator device 2 does not reach the defrosting condition, the refrigeration mode is maintained.

[0111] Further, the method for determining whether the evaporator device 2 reaches the defrosting condition, comprising: obtaining the current temperature of the target area and the outlet temperature of the refrigeration equipment, when the temperature difference between the current temperature of the target area and the outlet temperature of the refrigeration equipment is less than or equal to the defrosting temperature difference setting value, it is determined that the evaporator device 2 reaches the defrosting condition, if the temperature difference between the current temperature of the target area and the outlet temperature of the refrigeration equipment is greater than the defrosting temperature difference setting value, it is determined that the evaporator device 2 does not reach the defrosting condition.

[0112] Specifically, if the evaporator device 2 has two evaporators 21 arranged in series, and if the spray device 4 has two sprayers 41, one-to-one corresponding to the two evaporators 21, each sprayer 41 is arranged above the corresponding evaporator 21, and each sprayer 41 is connected to the output end of one of the second flow-through portions 512 in an on-off manner. The control method further comprises: when one of the two evaporators 21 reaches the defrosting condition, and the refrigeration mode is switched to the defrosting mode, connecting the sprayer 41 corresponding to the evaporator 21 that reaches the defrosting condition to the output end of one of the second flow-through portions 512; when both of the two evaporators 21 reach the defrosting condition, and the refrigeration mode is switched to the defrosting mode, connecting the sprayers 41 corresponding to the two evaporators 21 to the output end of one of the second flow-through portions 512 in turn. By using such a control method, the connection state of each sprayer 41 to the second flow-through portion 512 is selectively controlled according to actual needs, ensuring that the defrosting liquid is distributed to the corresponding evaporator 21 as needed. Further ensuring that the defrosting liquid can be precisely sprayed onto the surface of the corresponding evaporator that needs to be defrosted. Thus, the accuracy and efficiency of the spraying are improved, and the waste and uneven distribution of the defrosting liquid are avoided. In addition, each sprayer 41 can be independently started and stopped, reducing the overall response time of the system. In the case of rapid defrosting, the system can quickly start the corresponding sprayer 41 to promptly address the frost accumulation problem.

[0113] Specifically, if the refrigerant flows out of the condenser 1 to the first energy storage heat exchange device 5, the method for sequentially controlling the connection of each first flow-through portion 511 to the condenser 1 and the evaporator device 2 comprises: obtaining the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51; and sequentially controlling the connection between the corresponding first flow-through portion 511 and the condenser 1 and the evaporator device 2 from low to high according to the current temperature value of each phase change material. By using such a control method, the current temperature value of the phase change material of each first phase change energy storage heat exchanger 51 is used to accurately control the connection of each first flow-through portion 511 to the condenser 1 and the evaporator device 2, which can effectively regulate the flow of refrigerant, realize efficient absorption and storage of the waste heat of the refrigerant, and thus improve the energy efficiency and capacity utilization rate of the system, reduce energy waste, and reduce energy consumption and operating costs. At the same time, the temperature of the refrigerant can be further reduced, thereby improving the refrigeration effect, system refrigeration capacity, and performance coefficient.

[0114] Specifically, the method of controlling the connection between the first flow passage 511 and the condenser 1 and the evaporator device 2 in order from low to high according to the current temperature of each phase change material includes: obtaining the current temperature of the corresponding phase change material when one of the first flow passages 511 is connected to the condenser 1 and the evaporator device 2; when the current temperature of the corresponding phase change material is greater than the second preset temperature value, controlling the first flow passage 511 to be disconnected from the condenser 1 and the evaporator device 2; and controlling another of the first flow passages 511 to be connected to the condenser 1 and the evaporator device 2. By using such a control method, by monitoring the current temperature of the phase change material corresponding to the first flow passage 511 in communication in real time, it is possible to prevent the corresponding phase change material from reaching the preset threshold and still performing ineffective heat transfer, thereby reducing energy consumption and improving energy utilization.

[0115] Optionally, when one of the first flow passages 511 is connected to the condenser 1 and the evaporator device 2, the other first flow passages 511 are all in a disconnected state with the condenser 1.

[0116] The second preset temperature value refers to the lower limit of the phase change temperature range of the phase change material. When the current temperature of the phase change material is greater than the second preset temperature value, it means that the phase change material has completely melted. The first preset temperature value is less than the second preset temperature value. When the current temperature of the phase change material is less than or equal to the second preset temperature value and greater than or equal to the first preset temperature value, it means that the phase change material is in a solid-liquid mixed state.

[0117] The third preset temperature value is equal to or less than the second preset temperature value.

[0118] Specifically, the control method further includes: in the refrigeration mode, obtaining the current temperature of the phase change material corresponding to each first flow passage 511; after a preset time, comparing the current temperature of the phase change material corresponding to each first flow passage 511; and according to the comparison result, controlling the fourth control valve 9 corresponding to the phase change material with the highest current temperature to be opened. By using such a control method, the fourth control valve 9 corresponding to the phase change material with the highest current temperature is controlled to be opened, and the system can start effective defrosting operation in the shortest time to quickly respond to the frost accumulation problem. Thus, the response speed of the system is improved. Moreover, it can also ensure that the defrosting liquid can flow through the heat exchanger with the highest temperature first, thereby improving the heat extraction efficiency.

[0119] Optionally, in the refrigeration mode, the temperature of the phase change material in each first phase change energy storage heat exchanger 51 is detected every preset time, and when the phase change material in only one of the first phase change energy storage heat exchangers 51 is greater than or equal to a second preset temperature value, the first phase change energy storage heat exchanger 51 is selected as the defrosting energy storage unit, and the fourth control valve 9 of the first phase change energy storage heat exchanger 51 is controlled to be opened. When the temperature of the phase change material in at least two of the first phase change energy storage heat exchangers 51 is greater than or equal to the second preset temperature value, the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest temperature is selected as the defrosting energy storage unit, and the fourth control valve 9 of the first phase change energy storage heat exchanger 51 is controlled to be opened. The other fourth control valves 9 are in a closed state.

[0120] It can be understood that when the phase change material in the first first phase change energy storage heat exchanger 51 of each first phase change energy storage heat exchanger 51 is greater than or equal to the second preset temperature value, the first phase change energy storage heat exchanger 51 is first selected as the defrosting energy storage unit. After a period of time, when the phase change material in the second first phase change energy storage heat exchanger 51 of each first phase change energy storage heat exchanger 51 is greater than or equal to the second preset temperature value, the temperature of the phase change material in the two first phase change energy storage heat exchangers 51 is determined, and the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest temperature is selected as the defrosting energy storage unit. The fourth control valve 9 corresponding to the selected first phase change energy storage heat exchanger 51 is in an open state.

[0121] Optionally, when the detection frequency reaches a preset frequency, and the temperature of the phase change material in each first phase change energy storage heat exchanger 51 is less than the second preset temperature value, the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest current temperature is selected as the defrosting energy storage unit. Then, in the next detection, the defrosting energy storage unit is reselected according to the comparison result of the temperature of the phase change material in each first phase change energy storage heat exchanger 51.

[0122] Specifically, if the fourth control valve 9 and the first phase change energy storage unit each have N, N≥3; the control method further comprises: when in the refrigeration mode, the current temperature of the phase change material in each first phase change energy storage unit is greater than the second preset temperature value, the first flow passage 511 of one of the first phase change energy storage units corresponding to each fourth control valve 9 in a closed state is connected with the condenser 1 and the evaporator device 2, respectively. By using such a control method, it is ensured that the refrigerant can smoothly enter the evaporator device 2.

[0123] Specifically, the control method further comprises: after the refrigeration mode is started, obtaining the current outdoor temperature, and determining whether the refrigerant flowing out of the condenser 1 flows to the first energy storage heat exchange device 5 according to the current outdoor temperature; if the current outdoor temperature is greater than or equal to the fourth preset temperature value, controlling the refrigerant flowing out of the condenser 1 to flow to the first energy storage heat exchange device 5; and if the current outdoor temperature is less than the fourth preset temperature value, controlling the refrigerant flowing out of the condenser 1 to flow to the second energy storage heat exchange device 13. By using such a control method, the flow directions of the refrigerant and the defrosting liquid are selectively controlled according to the current outdoor temperature. The flow directions of the refrigerant and the defrosting liquid can be controlled according to the outdoor temperature, and different phase change temperatures can be used, so that the condenser waste heat can be effectively recovered, and the best heat recovery effect can be ensured. Moreover, the system can adapt to different seasons by automatically switching between the first energy storage heat exchange device 5 and the second energy storage heat exchange device 13 according to the environmental temperature, the load demand and the phase change material temperature, so that the system can effectively perform waste heat defrosting and refrigerant secondary supercooling in different environments, and the energy utilization efficiency is maximized.

[0124] The phase change temperature of the phase change material of the first energy storage heat exchange device 5 is different from the phase change temperature of the phase change material of the second energy storage heat exchange device 13, and the phase change temperature of the phase change material of the first energy storage heat exchange device 5 is greater than the phase change temperature of the phase change material of the second energy storage heat exchange device 13.

[0125] For example, the phase change temperature range of the phase change material of the first energy storage heat exchange device 5 is selected to be 45-50°C, and the phase change temperature range of the phase change material of the second energy storage heat exchange device 13 is selected to be 25-30°C.

[0126] The phase change temperature range of the phase change material is selected according to actual needs, and the phase change temperature of the phase change material can be between 0-100°C. The phase change temperature range should be slightly smaller than the condenser outlet refrigerant temperature, so that the phase change material can be completely melted and absorb the latent heat to the maximum extent. Therefore, the phase change temperature range can be changed according to different units.

[0127] For example, when the outdoor temperature is greater than or equal to 20°C, the refrigerant flows to the first energy storage heat exchange device 5. When the outdoor temperature is less than 20°C, the refrigerant flows to the second energy storage heat exchange device 13.

[0128] For another example, the refrigerant flows to the second energy storage heat exchange device 13 in winter, and the refrigerant flows to the first energy storage heat exchange device 5 in summer.

[0129] Optionally, the working process of the control system is specifically as follows:

[0130] The control system is as follows: Figure 1As shown, there are two evaporators 21, two water pans 31, two water pumps 32, two sprinklers 41, and N (N≥3) first phase-change energy storage heat exchangers 51 and second phase-change energy storage heat exchangers 131.

[0131] Step 1: After the cold storage is turned on, the current outdoor temperature is obtained in the refrigeration mode; whether the refrigerant flowing out of the condenser 1 flows to the first energy storage heat exchanger 5 is determined according to the current outdoor temperature. In addition, whether to switch to the defrosting mode is also determined.

[0132] Step 2: If the current outdoor temperature is greater than or equal to the fourth preset temperature value, the refrigerant flowing out of the condenser 1 is controlled to flow to the first energy storage heat exchanger 5, and then the current temperature values of the phase-change materials of the first phase-change energy storage heat exchangers 51 are obtained and compared, and the connections between the corresponding first flow-through parts 511 and the condenser 1 and the evaporator device 2 are controlled in turn from low to high. Thus, the refrigerant flowing out of the first energy storage heat exchanger 5 enters the evaporators 21 in turn to achieve the refrigeration effect.

[0133] Specifically, in the refrigeration mode, the third control valve 8 and each fourth control valve 9 are controlled to be in a closed state; the second control valve 7 is controlled to be opened, and the current temperature of the phase-change material of each first phase-change energy storage heat exchanger 51 is obtained, and the corresponding first control valve 6 is controlled to be opened in turn according to the current temperature of the phase-change material of each first phase-change energy storage heat exchanger 51. When the current temperature of the phase-change material is in the first phase-change energy storage heat exchanger 51 corresponding to the first control valve 6 that is opened, the first flow-through part 511 of the first phase-change energy storage heat exchanger 51 is connected with the condenser 1 and the evaporator device 2, respectively, and the phase-change material of the first phase-change energy storage heat exchanger 51 absorbs and stores the heat released by the refrigerant. When the phase-change material of the first phase-change energy storage heat exchanger 51 is completely melted (i.e., when the heat absorption is completed), the first control valve 6 corresponding to the first phase-change energy storage heat exchanger 51 is controlled to be closed. Then, the current temperature of the phase-change material is in the second-lowest first phase-change energy storage heat exchanger 51 corresponding to the first control valve 6 that is opened. Then, the same process is repeated. When switching from the refrigeration mode to the defrosting mode, each first control valve 6 and the second control valve 7 are controlled to be in a closed state.

[0134] When the current temperatures of the phase-change materials of each first phase-change energy storage heat exchanger 51 are consistent, the first control valve 6 is controlled to be opened and closed in turn according to the installation positions of each first phase-change energy storage heat exchanger 51 or the preset designation or the codes of each first phase-change energy storage heat exchanger 51.

[0135] Step 3, in the refrigeration mode, during the refrigerant flow, at a preset time, the temperature of the phase change material of each first phase change energy storage heat exchanger 51 is detected, when the phase change material of only one first phase change energy storage heat exchanger 51 in each first phase change energy storage heat exchanger 51 is greater than or equal to the second preset temperature value, the first phase change energy storage heat exchanger 51 is selected as the defrosting energy storage unit, and the fourth control valve 9 of the first phase change energy storage heat exchanger 51 is controlled to be opened. When the temperature of the phase change material of at least two first phase change energy storage heat exchangers 51 in each first phase change energy storage heat exchanger 51 is greater than or equal to the second preset temperature value, the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest temperature is selected as the defrosting energy storage unit, and the fourth control valve 9 of the first phase change energy storage heat exchanger 51 is controlled to be opened. The other fourth control valves 9 are in a closed state.

[0136] It can be understood that when the phase change material of the first first phase change energy storage heat exchanger 51 in each first phase change energy storage heat exchanger 51 is greater than or equal to the second preset temperature value, the first phase change energy storage heat exchanger 51 is first selected as the defrosting energy storage unit, and after a period of time, when the phase change material of the second first phase change energy storage heat exchanger 51 in each first phase change energy storage heat exchanger 51 is greater than or equal to the second preset temperature value, the temperature of the phase change material of the two first phase change energy storage heat exchangers 51 is determined, and the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest temperature is selected as the defrosting energy storage unit. The corresponding fourth control valve 9 is in an open state.

[0137] Optionally, when the detection frequency reaches a preset frequency, and the temperature of the phase change material in each first phase change energy storage heat exchanger 51 is less than the second preset temperature value, the first phase change energy storage heat exchanger 51 corresponding to the phase change material with the highest current temperature is selected as the defrosting energy storage unit. Then, the next time of detection, the defrosting energy storage unit is reselected according to the comparison result of the temperature of the phase change material in each first phase change energy storage heat exchanger 51.

[0138] Step 4, when at least one evaporator 21 in the two evaporators 21 reaches the defrosting condition, and the current temperature value of the phase change material of at least one first phase change energy storage heat exchanger 51 in each first phase change energy storage heat exchanger 51 is greater than the first preset temperature value, the refrigeration mode is switched to the defrosting mode.

[0139] Step 5, in defrosting mode, control each first control valve 6 and second control valve 7 to be closed, and control third control valve 8, water pump 32 corresponding to the evaporator 21 which needs to be defrosted and fifth control valve 11 to be opened, so that the defrosting liquid in the water pan 31 corresponding to the evaporator 21 which needs to be defrosted flows out, and then flows into the second flow passage 512 of the first phase change energy storage heat exchanger 51 corresponding to the fourth control valve 9 in the open state in sequence through the water pump 32, the filtering device 10, the third control valve 8 and the fourth control valve 9 in the open state, and absorbs heat. The defrosting liquid after absorbing heat flows to the sprayer 41 corresponding to the evaporator 21 which needs to be defrosted through the fifth control valve 11 in the open state, and finally the sprayer 41 sprays the defrosting liquid to the surface of the evaporator 21, and the water melted after defrosting flows back to the water pan 31, so as to circulate.

[0140] Step 6, when both evaporators 21 reach the defrosting condition, defrosting is performed on the two evaporators 21 in sequence after entering the defrosting mode. Preferably, the evaporator 21 corresponding to the lower refrigeration temperature is defrosted first according to the order of refrigeration temperature.

[0141] When the released heat of the phase change material is less than the first preset temperature value (i.e. the phase change material becomes solid), the fourth control valve 9 in the open state is switched to the closed state, and then the fourth control valves 9 corresponding to the phase change materials of other first phase change energy storage heat exchangers 51 are opened in sequence from high to low according to the current temperature of the phase change material. One fourth control valve 9 is opened, and the other fourth control valves 9 are in the closed state. When any one of the second flow passages 512 is connected with the supply device 3 and the spraying device 4 respectively in the defrosting state, and it is detected that the evaporator device 2 has completed defrosting, each second flow passage 512 is disconnected with the supply device 3 and the spraying device 4 respectively, and the defrosting mode is switched to the refrigeration mode. When each second flow passage 512 is connected with the supply device 3 and the spraying device 4 respectively in the defrosting mode, and the current temperature of the phase change material corresponding to each second flow passage 512 is less than the first preset temperature value, it is detected that the evaporator device 2 has not completed defrosting, the defrosting mode is paused, the third control valve 8 and each fourth control valve 9 are controlled to be in the closed state, and the refrigeration mode is switched. When the current temperature of at least one of the phase change materials corresponding to each second flow passage 512 is greater than or equal to the third preset temperature value, the defrosting mode is switched again, and the defrosting mode is continued. After defrosting is completed, the refrigeration mode is switched again.

[0142] Step 7, when the current outdoor temperature is less than the fourth preset temperature value, the refrigerant flowing out of the condenser 1 is controlled to flow to the second energy storage heat exchanger 13. The control process of the second energy storage heat exchanger 13 is the same as that of the first energy storage heat exchanger 5, which will not be described here.

[0143] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and in the above description of the drawings merely mean different instances of similar objects, and do not necessarily imply a specific order or sequence. It should be understood that the data thus used in the description can be interchanged, where appropriate, so that the embodiments of the present application described herein can be carried out in other than the order shown or described herein. Furthermore, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a list of steps or units not necessarily limited to those expressly listed, but can include other steps or units not expressly listed or inherent to such process, method, product, or apparatus.

[0144] Optionally, the specific examples in the embodiments can refer to the examples described in the above embodiments, and the embodiments will not be described here again.

[0145] The serial numbers of the above embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0146] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0147] The above is only the preferred embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A control system, characterized in that, include: A condenser (1) and an evaporator (2) are connected in sequence. A supply device (3) and a spray device (4) are connected together. The supply device (3) is used to supply defrosting liquid to the spray device (4). The spray device (4) is arranged above the evaporator device (2) for spraying defrost the evaporator device (2). A first energy storage heat exchange device (5) is used for heat exchange and storage of heat. The first energy storage heat exchange device (5) has at least two first phase change energy storage heat exchangers (51). Each first phase change energy storage heat exchanger (51) is provided with a first flow section (511) for refrigerant flow and a second flow section (512) for defrosting liquid flow. Each first flow section (511) is connected to the condenser (1) and the evaporator (21) respectively, and each second flow section (512) is connected to the supply device (3) and the spray device (4) respectively. In the cooling mode, the connection between each of the first flow sections (511) and the condenser (1) and the evaporator (2) is controlled sequentially, so that the phase change material of each of the first phase change energy storage heat exchangers (51) sequentially absorbs and stores the heat released by the refrigerant flowing into the corresponding first flow section (511), and the connection between each of the second flow sections (512) and the supply device (3) and the spray device (4) is controlled respectively. In the defrosting mode, the connection between each of the first flow sections (511) and the condenser (1) and the evaporator (2) is controlled respectively, and the connection between each of the second flow sections (512) and the supply device (3) and the spray device (4) is adaptively controlled according to the current temperature of the phase change material of each of the first phase change energy storage heat exchangers (51).

2. The control system according to claim 1, characterized in that, The control system further includes a control device for determining whether to switch from the cooling mode to the defrosting mode and for obtaining the current temperature of the phase change material of each of the first phase change energy storage heat exchangers (51), and for adaptively controlling the on / off connection of each of the first flow sections (511) with the condenser (1) and the evaporator device (2) and the on / off connection of each of the second flow sections (512) with the supply device (3) and the spray device (4) based on the determination result and the current temperature of each of the phase change materials.

3. The control system according to claim 1, characterized in that, The control system further includes: At least two first control valves (6) are provided, each first control valve (6) is provided in a one-to-one correspondence with each first phase change energy storage heat exchanger (51), and each first control valve (6) is connected to the input end of the corresponding first flow section (511) and the output end of the condenser (1); each first control valve (6) is used to control the on / off connection between the corresponding first flow section (511) and the condenser (1). The second control valve (7) has its input end connected to the output end of each of the first flow sections (511) and its output end connected to the input end of the evaporator device (2). The second control valve (7) is used to control the on / off connection between each of the first flow sections (511) and the evaporator device (2).

4. The control system according to claim 1, characterized in that, The control system further includes: The third control valve (8) has its input end connected to the output end of the supply device (3), and its output end is connected to the input end of each of the second flow sections (512); the third control valve (8) is used to control the on / off connection between the supply device (3) and the input ends of each of the second flow sections (512); At least two fourth control valves (9) are provided, each of the fourth control valves (9) is provided in a one-to-one correspondence with each of the first phase change energy storage heat exchangers (51), each of the fourth control valves (9) is provided between the third control valve (8) and the input end of the corresponding second flow section (512), and each of the fourth control valves (9) is connected to the input end of the corresponding second flow section (512) and the output end of the third control valve (8).

5. The control system according to claim 1, characterized in that, The control system further includes a filter device (10), which is disposed between the supply device (3) and the first energy storage heat exchange device (5). The filter device (10) is connected to the input end of the supply device (3) and the input end of each of the second flow sections (512). The filter device (10) is used to filter the defrosting liquid.

6. The control system according to claim 1, characterized in that, The evaporator device (2) includes: at least one evaporator (21), the input end of which is slewably connected to the output end of each of the first flow sections (511); The supply device (3) includes: at least one water receiving tray (31), which is arranged one-to-one with the evaporator (21). The water receiving tray (31) is arranged below the corresponding evaporator (21). The water receiving tray (31) is used to collect and store the defrosting liquid flowing down from the evaporator (21). The output end of the water receiving tray (31) is connected to the input end of each of the second flow sections (512) in a switchable manner.

7. The control system according to claim 6, characterized in that, The supply device (3) further includes: At least one water pump (32) is provided, with each water pump (32) corresponding to a water receiving tray (31). The input end of each water pump (32) is connected to the output end of the corresponding water receiving tray (31), and the output end of each water pump (32) is connected to the input end of each of the second flow sections (512) in a way that allows for switching on and off; and / or, A water supply pipe (33) is connected to the water receiving tray (31) and is used to replenish the defrosting fluid to the water receiving tray (31).

8. The control system according to claim 1, characterized in that, The evaporator device (2) includes: an evaporator (21), at least one of the input terminals of the evaporator (21) being slewably connected to the output terminals of each of the first flow sections (511); The spraying device (4) includes: at least one sprayer (41), the sprayer (41) is arranged in a one-to-one correspondence with the evaporator (21), the sprayer (41) is arranged above the corresponding evaporator (21), the sprayer (41) is used to spray defrosting liquid onto the corresponding evaporator (21) for defrosting; the input end of the sprayer (41) is slewably connected to the output end of each of the second flow sections (512).

9. The control system according to claim 8, characterized in that, The control system further includes at least one fifth control valve (11), which is configured in a one-to-one correspondence with the sprayers (41). The fifth control valve (11) is connected to the input end of the corresponding sprayer (41) and the output end of each of the second flow sections (512). The fifth control valve (11) is used to control the on / off connection between the output end of each of the second flow sections (512) and the corresponding sprayer (41).

10. The control system according to claim 2, characterized in that, Each of the first phase change energy storage heat exchangers (51) is provided with a first temperature detection device (12), and the first temperature detection device (12) on each of the first phase change energy storage heat exchangers (51) is used to detect the temperature of the phase change material of the corresponding first phase change energy storage heat exchanger (51). Each of the first temperature detection devices (12) is connected to the control device, and each of the first temperature detection devices (12) sends the detected temperature of the phase change material of the corresponding first phase change energy storage heat exchanger (51) to the control device.

11. The control system according to claim 1, characterized in that, The control system further includes: A second energy storage heat exchange device (13) is used for heat exchange and heat storage; the second energy storage heat exchange device (13) has at least two second phase change energy storage heat exchangers (131), each of the second phase change energy storage heat exchangers (131) is provided with a third flow section (1311) for refrigerant flow and a fourth flow section (1322) for defrosting liquid flow; each of the third flow sections (1311) is connected to the condenser (1) and the evaporator (21) respectively, and each of the fourth flow sections (1322) is connected to the supply device (3) and the spray device (4) respectively; the first energy storage heat exchange device (5) and the second energy storage heat exchange device (13) are arranged in parallel; A control device for acquiring the current outdoor temperature, and selectively controlling the flow of the refrigerant and the defrosting liquid to the first energy storage heat exchanger (5) or the second energy storage heat exchanger (13) based on the current outdoor temperature.

12. A refrigeration device, characterized in that, include: The control system according to any one of claims 1 to 11.

13. A control method, characterized in that, The control method is applied to the control system according to any one of claims 1 to 11, the control method comprising: After the cooling mode is activated, the refrigerant flow path is controlled, and it is determined whether to switch to defrost mode. If the refrigerant flowing out of the condenser (1) is controlled to flow to the first energy storage heat exchange device (5), the connection of each of the first flow sections (511) to the condenser (1) and the evaporator device (2) is controlled in sequence, so that the phase change material of each of the first phase change energy storage heat exchangers (51) absorbs and stores the heat released by the refrigerant flowing into the corresponding first flow section (511). If the cooling mode is switched to the defrosting mode, the current temperature value of the phase change material of each of the first phase change energy storage heat exchangers (51) is obtained; Based on the current temperature value of the phase change material in each of the first phase change energy storage heat exchangers (51), the connection between each of the second flow sections (512) and the supply device (3) and the spray device (4) is adaptively controlled so that the defrosting liquid flowing into at least one of the second flow sections (512) absorbs the heat released by the corresponding phase change material, and the defrosting liquid after absorbing the heat flows to the spray device (4).

14. The control method according to claim 13, characterized in that, The method of adaptively controlling the connection between each of the second flow sections (512) and the supply device (3) and the spray device (4) respectively, based on the current temperature value of the phase change material of each of the first phase change energy storage heat exchangers (51), when the cooling mode is switched to the defrost mode, includes: If the cooling mode is switched to the defrosting mode, compare the current temperature value of the phase change material of each of the first phase change energy storage heat exchangers (51); Based on the current temperature value of each phase change material, the connection between the corresponding second flow section (512) and the supply device (3) and the spray device (4) is selectively controlled in descending order of temperature.

15. The control method according to claim 14, characterized in that, The method of selectively controlling the connection of the corresponding second flow section (512) to the supply device (3) and the spray device (4) in descending order of the current temperature value of each phase change material includes: When one of the second flow sections (512) is connected to the supply device (3) and the spray device (4) respectively, the current temperature of the corresponding phase change material is obtained; When the current temperature of the corresponding phase change material is less than the first preset temperature value, the second flow section (512) is controlled to disconnect from the supply device (3) and the spray device (4) respectively; and when the other second flow section (512) of each second flow section (512) is connected to the supply device (3) and the spray device (4) respectively.

16. The control method according to claim 15, characterized in that, The control method further includes: After the defrosting mode is activated, the current defrosting status of the evaporator device (2) is detected; When any one of the second circulation sections (512) is connected to the supply device (3) and the spray device (4) respectively, and it is detected that the evaporator device (2) has completed defrosting, the defrosting mode is switched to the cooling mode. When each of the second circulation sections (512) is disconnected from the supply device (3) and the spray device (4) respectively, and it is detected that the evaporator device (2) has not completed defrosting, the defrosting mode is switched to the refrigeration mode. When switching to the cooling mode, if the current temperature of the phase change material corresponding to at least one of the second flow sections (512) is greater than or equal to the third preset temperature value, the cooling mode is switched to the defrosting mode and defrosting continues. The third preset temperature value is greater than the first preset temperature value.

17. The control method according to claim 13, characterized in that, After the cooling mode is running, the method for determining whether to switch to the defrost mode includes: After the cooling mode is running, it is determined whether the evaporator device (2) has reached the defrosting condition; If the evaporator device (2) reaches the defrosting condition, the current temperature value of the phase change material of each of the first phase change energy storage heat exchangers (51) is obtained; If the current temperature value of the phase change material of each of the first phase change energy storage heat exchangers (51) is less than the first preset temperature value, the cooling mode is maintained. If the current temperature value of the phase change material of at least one of the first phase change energy storage heat exchangers (51) is greater than the first preset temperature value, the cooling mode is switched to the defrosting mode.

18. The control method according to claim 17, characterized in that, If the evaporator device (2) has two evaporators (21), the two evaporators (21) are connected in series; if the spray device (4) has two sprayers (41), the two evaporators (21) and the two sprayers (41) are arranged in a one-to-one correspondence, each sprayer (41) is arranged above the corresponding evaporator (21), and each sprayer (41) is connected to the output end of each of the second flow sections (512) in a switchable manner; The control method further includes: When one of the two evaporators (21) reaches the defrosting condition and the refrigeration mode is switched to the defrosting mode, the sprayer (41) corresponding to the evaporator (21) that has reached the defrosting condition is connected to the output end of one of the second flow sections (512). When both evaporators (21) reach the defrosting condition and the refrigeration mode is switched to the defrosting mode, the sprayers (41) corresponding to the two evaporators (21) are sequentially connected to the output end of one of the second flow sections (512) of each second flow section (512).

19. The control method according to claim 13, characterized in that, The method for sequentially controlling the connection of each of the first flow sections (511) to the condenser (1) and the evaporator device (2) if the refrigerant flowing out from the condenser (1) flows to the first energy storage heat exchange device (5) includes: Obtain the current temperature value of the phase change material in each of the first phase change energy storage heat exchangers (51); Based on the current temperature value of each phase change material, the connection between the corresponding first flow section (511) and the condenser (1) and the evaporator device (2) is controlled sequentially from low to high.

20. The control method according to claim 19, characterized in that, The method of controlling the connection between the corresponding first flow section (511) and the condenser (1) and the evaporator device (2) in ascending order of the current temperature value of each phase change material includes: When one of the first flow sections (511) is connected to the condenser (1) and the evaporator device (2) respectively, the current temperature of the corresponding phase change material is obtained; When the current temperature of the corresponding phase change material is greater than the second preset temperature value, the first flow section (511) is controlled to disconnect from the condenser (1) and the evaporator device (2) respectively; and when the other first flow section (511) of each first flow section (511) is connected to the condenser (1) and the evaporator device (2) respectively.

21. The control method according to claim 20, characterized in that, The control method is applied to the control system of claim 4, and the control method further includes: In cooling mode, the current temperature of the phase change material corresponding to each of the first flow sections (511) is obtained; After a preset time, the current temperature of the phase change material corresponding to each of the first flow sections (511) is compared; Based on the comparison results, the fourth control valve (9) corresponding to the phase change material whose current temperature is at its highest value is opened.

22. The control method according to claim 21, characterized in that, If both the fourth control valve (9) and the first phase change energy storage device have N units, where N ≥ 3; the control method further includes: When in cooling mode, if the current temperature value of the phase change material of each of the first phase change energy storage devices is greater than the second preset temperature value, the first flow section (511) of one of the first phase change energy storage devices corresponding to the fourth control valve (9) which is in the closed state is connected to the condenser (1) and the evaporator device (2).

23. The control method according to claim 13, characterized in that, The control method is applied to the control system of claim 11, and the control method further includes: After the cooling mode is turned on, the current outdoor temperature is obtained so as to determine whether the refrigerant flowing out of the condenser (1) flows to the first energy storage heat exchange device (5) based on the current outdoor temperature. If the current outdoor temperature is greater than or equal to the fourth preset temperature value, control the refrigerant flowing out of the condenser (1) to flow to the first energy storage heat exchange device (5); If the current outdoor temperature is less than the fourth preset temperature value, control the refrigerant flowing out of the condenser (1) to flow to the second energy storage heat exchange device (13).

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