Staged refrigerating system and refrigerating method for refrigerating machine

Abstract

The invention provides a refrigerating machine grading refrigerating system and method, and relates to the technical field of refrigerating machines, the system comprises a first cooling loop, a second cooling loop and a third cooling loop, cooling liquid can circulate in different cooling loops to conduct heat exchange cooling on a refrigerating object, and the refrigerating efficiency is improved. And the cooling liquid after heat exchange needs to be cooled and then circulated again. The first cooling loop is used for naturally cooling the cooling liquid through the cooling box, the second cooling loop is used for cooling the cooling liquid through the refrigerating machine, and the third cooling loop is used for cooling the cooling liquid in a faster mode in the mode that the cooling box and the refrigerating machine are combined. Through the staged cooling mode, the refrigerating machine can be prevented from being in an overload or underload state, the effect of prolonging the service life of the refrigerating machine can be achieved, and the system structure can be simplified by arranging the first three-way valve and the second three-way valve.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerators, and in particular to a refrigerator graded refrigeration system and a refrigeration method. Background Art

[0002] The refrigerator is one of the commonly used industrial refrigeration and cooling equipment. The main working principle of the refrigerator is to cool the coolant at room temperature to a certain temperature through the compressor of the refrigeration module, and then pass the low-temperature coolant into the water cooling area of ​​the industrial equipment for enhanced cooling. There are three main interconnected systems, the refrigerant circulation system, the water circulation system and the electrical automatic control system. Among them, the compressor is the core component of the entire refrigerant circulation system and the source of power for refrigerant compression. Its function is to convert the input electrical energy into mechanical energy, circulate and compress the refrigerant to continuously generate cold. The water circulation system injects the coolant into the refrigeration object for cooling, and the electrical automatic control system links the refrigerator circulation system and the water circulation system to realize the automatic intelligent cooling of the refrigerator.

[0003] Large changes in the cooling demand of the refrigeration object may cause the refrigeration module in the refrigerator to be overloaded or underloaded, affecting the life of the refrigerator. Summary of the invention

[0004] The present application provides a refrigerator staged refrigeration system and a refrigeration method, which can realize staged refrigeration of refrigeration objects and avoid overloading or underloading of the refrigerator during operation, thereby affecting the life of the equipment.

[0005] The present application provides a refrigerator staged refrigeration system, comprising:

[0006] a first cooling circuit, a second cooling circuit, and a third cooling circuit;

[0007] The first cooling circuit includes a cooling box, a cooling area for a refrigerated object, and the first three-way valve, which are sequentially connected by pipelines to form a loop; the cooling box is used to contain a coolant;

[0008] The second cooling circuit includes a refrigerator, the cooling area of ​​the cooling object, and the first three-way valve which are sequentially connected through pipelines to form a loop; the refrigerator is used to cool the coolant in the second cooling circuit;

[0009] A third cooling circuit includes the cooling box, the second three-way valve, the refrigerator, the cooling area for the refrigerated object, and the first three-way valve, which are sequentially connected by pipelines to form a loop;

[0010] The first three-way valve is used to divert the coolant so that the coolant flows through the first cooling circuit or the second cooling circuit; the second three-way valve is used to divert the coolant so that the coolant flows through the first cooling circuit or the third cooling circuit.

[0011] In one embodiment of the present application, the refrigerator staged refrigeration system further includes:

[0012] A fourth cooling circuit includes a liquid inlet pipe, the cooling box, a second three-way valve, the refrigerator, the cooling area of ​​the refrigeration object, a third three-way valve, and a liquid discharge pipe connected in sequence through pipelines;

[0013] Among them, the coolant flowing through the cooling zone of the refrigeration object is discharged from the drain pipe, the inlet pipe is used to transport new coolant to the cooling box, and the third three-way valve is used to divert the coolant so that the coolant flows through the third cooling circuit or the fourth cooling circuit.

[0014] In one embodiment of the present application, the refrigerator staged refrigeration system further includes:

[0015] A first circulation pump is provided between the refrigerator and the cooling zone of the refrigeration object.

[0016] In one embodiment of the present application, the refrigerator staged refrigeration system further includes:

[0017] A second circulating pump is arranged on the pipeline at the outlet end of the cooling box.

[0018] In one embodiment of the present application, the refrigerator staged refrigeration system further includes:

[0019] A first temperature detection module for detecting the temperature at the outlet end of the cooling zone of the refrigeration object, a second temperature detection module for detecting the temperature of the cooling box, and a third temperature detection module for detecting the refrigeration temperature of the refrigerator.

[0020] To achieve the above-mentioned purpose and other related purposes, the present application provides a refrigerator staged refrigeration method, which is applied to a refrigerator staged refrigeration system provided by any of the above-mentioned embodiments, and the refrigerator staged refrigeration method includes:

[0021] Get the current temperature of the cooling object and the difference between the inlet and outlet temperatures of the cooling water of the cooling object;

[0022] If the current temperature is less than a first preset value, the first-stage refrigeration is started to cool the refrigeration object through the first cooling circuit;

[0023] If the current temperature is greater than or equal to the first preset value and less than the second preset value, starting secondary refrigeration to cool the refrigeration object through the second cooling circuit;

[0024] If the current temperature is greater than or equal to the second preset value and less than the third preset value, the third-stage refrigeration or the fourth-stage refrigeration is started according to the cooling water inlet and outlet temperature difference to cool the refrigeration object through the third cooling circuit, or the refrigeration object is cooled through the fourth cooling circuit;

[0025] If the current temperature is greater than or equal to the third preset value, the fourth-stage refrigeration is started.

[0026] In one embodiment of the present application, if the current temperature is greater than or equal to the second preset value and less than the third preset value, the third-stage refrigeration or the fourth-stage refrigeration is started according to the cooling water inlet and outlet temperature difference, including:

[0027] If the current temperature is greater than or equal to the second preset value and less than the third preset value, and the cooling water inlet and outlet temperature difference is less than or equal to the preset temperature difference, then start the third-stage refrigeration;

[0028] If the current temperature is greater than or equal to the second preset value and less than the third preset value, and the cooling water inlet and outlet temperature difference is greater than the preset temperature difference, the fourth-stage refrigeration is started.

[0029] In one embodiment of the present application, starting the secondary refrigeration includes:

[0030] Get the temperature change rate of the refrigeration object;

[0031] If the temperature change rate is greater than or equal to the preset first rate, regulating the power of the first circulation pump;

[0032] If the temperature change rate is less than the preset first rate, the power of the refrigerator is regulated.

[0033] In one embodiment of the present application, regulating the power of the first circulation pump includes:

[0034] When the temperature change rate is a positive number, the power of the first circulation pump is increased; when the temperature change rate is a negative number, the power of the first circulation pump is reduced.

[0035] In one embodiment of the present application, regulating the power of the refrigerator includes:

[0036] When the temperature change rate is a positive number, the power of the refrigerator is increased; when the temperature change rate is a negative number, the power of the refrigerator is reduced.

[0037] As described above, the present application provides a refrigerator staged refrigeration system and a refrigeration method, which have the following features:

[0038] Beneficial effects:

[0039] A refrigerator graded refrigeration system in the present application includes a first cooling circuit, a second cooling circuit and a third cooling circuit. The coolant can circulate in different cooling circuits to perform heat exchange cooling on the refrigeration object. The coolant after heat exchange needs to be cooled and circulated again. The first cooling circuit naturally cools the coolant through a cooling box, the second cooling circuit cools the coolant through a refrigerator, and the third cooling circuit cools the coolant in a faster manner by combining a cooling box and a refrigerator. When the refrigerator is underloaded, the coolant can be cooled through the first cooling circuit, and when the refrigerator is overloaded, the coolant can be cooled through the third cooling circuit. By using graded cooling, the refrigerator can be prevented from being overloaded or underloaded, and the service life of the refrigerator can be increased. The first three-way valve and the second three-way valve are provided to simplify the system structure.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0042] Figure 1 is a structural schematic diagram of a refrigerator staged refrigeration system shown in an exemplary embodiment of the present application;

[0043] Figure 2 is a schematic diagram showing a coolant flowing through a first cooling circuit according to an exemplary embodiment of the present application;

[0044] Figure 3 is a schematic diagram showing a coolant flowing through a second cooling circuit according to an exemplary embodiment of the present application;

[0045] Figure 4 is a schematic diagram showing coolant flowing through a third cooling circuit according to an exemplary embodiment of the present application;

[0046] Figure 5 is a schematic diagram showing coolant flowing through a fourth cooling circuit according to an exemplary embodiment of the present application;

[0047] Figure 6 It is a flow chart of a refrigerator staged refrigeration method shown in an exemplary embodiment of the present application.

[0048] Description of the accompanying drawings:

[0049] 101, cooling box; 102, cooling area of ​​refrigeration object; 103, first three-way valve; 104, refrigerator; 105, second three-way valve; 106, liquid inlet pipe; 107, third three-way valve; 108, liquid discharge pipe; 109, first circulation pump; 110, second circulation pump; 111, first temperature detection module; 112, second temperature detection module; 113, third temperature detection module; a, refrigeration module; b, heat exchange module; c, cooling water tank. DETAILED DESCRIPTION

[0050] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0051] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0052] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0053] See also Figure 1 , Figure 1 is a schematic diagram of a refrigerator staged refrigeration system according to an exemplary embodiment of the present application. Figure 1 It can be seen that the refrigerator staged refrigeration system may include:

[0054] A first cooling circuit and a second cooling circuit.

[0055] The first cooling circuit includes a cooling box 101, a cooling zone 102 for a refrigerated object, and a first three-way valve 103, which are sequentially connected by pipelines to form a loop. The outlet end of the cooling box 101 is connected to the inlet end of the cooling zone 102 for a refrigerated object, the outlet end of the cooling zone 102 for a refrigerated object is connected to the first end of the first three-way valve 103, and the second end of the first three-way valve 103 is connected to the inlet end of the cooling box 101.

[0056] The second cooling circuit includes a refrigerator 104, a cooling zone 102 for a cooling object, and a first three-way valve 103, which are sequentially connected through pipelines to form a loop. The outlet end of the refrigerator 104 is connected to the inlet end of the cooling zone 102 for a cooling object, the outlet end of the cooling zone 102 for a cooling object is connected to the first end of the first three-way valve 103, and the third end of the first three-way valve 103 is connected to the inlet end of the refrigerator 104.

[0057] The cooling box 101 is used to contain the cooling liquid, and the refrigerator 104 is used to cool the cooling liquid in the second cooling circuit. The first three-way valve 103 is used to divert the cooling liquid so that the cooling liquid flows through the first cooling circuit or the second cooling circuit.

[0058] It should be noted that Figure 1 The direction of the arrow in the middle represents the flow direction of the coolant. The coolant can be water, ethylene glycol and its mixture, propylene glycol, mineral oil or fluorinated liquid, etc.

[0059] In one embodiment of the present application, the refrigeration object may be industrial equipment, and the refrigeration object may include power generation equipment, chemical equipment, metal processing equipment, electronic equipment or machinery manufacturing, etc. In order to maintain the normal operating temperature of industrial equipment, improve efficiency and extend service life, a cooling zone is often set in the industrial equipment to pass coolant, and the refrigeration object cooling zone 102 in the embodiment of the present application may be a cooling zone of industrial equipment.

[0060] See also Figure 2 , which is a schematic diagram showing the coolant flowing through the first cooling circuit according to an exemplary embodiment of the present application. Figure 2 In the figure, the dashed arrow indicates the direction of coolant flow. Figure 2 It can be seen that when the coolant flows through the first cooling circuit, the coolant is cooled through the coolant object cooling zone 102, and the coolant exchanges heat in the coolant object cooling zone 102. The coolant after heat exchange can flow into the cooling box 101 and is naturally cooled in the cooling box 101. After the coolant is naturally cooled, it can be circulated in the first cooling circuit again.

[0061] When the cooling amount required for the cooling process of the refrigeration object is small, if the refrigerator 104 is used to cool the refrigeration object, the workload of the refrigerator 104 is lower than its minimum stable operating point, which will cause the refrigerator 104 to be underloaded. In the underloaded state, the compressor of the refrigerator 104 will start and stop frequently. Such frequent start and stop will cause the internal components of the compressor, such as bearings and pistons, to bear additional pressure, thereby accelerating their wear, shortening the life of the compressor, and further shortening the life of the refrigerator 104. Therefore, when the cooling amount required for the cooling process of the refrigeration object is small, the cooling box 101 can be used to naturally cool the coolant, and the naturally cooled coolant can be used to cool the refrigeration object, which can avoid the refrigerator 104 from working in an underloaded state and increase the life of the refrigerator 104.

[0062] In one embodiment of the present application, the refrigerator 104 can quickly cool the coolant, and the refrigerator 104 can include a refrigeration module a, a heat exchange module b, and a cooling water tank c. The refrigeration module a can include a compressor, and the heat exchange module b can be an evaporator.

[0063] The compressor is responsible for sucking in low-pressure and low-temperature gaseous refrigerant and compressing it into high-temperature and high-pressure gas through mechanical action. After entering the condenser, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the external environment or cooling medium, thereby releasing heat and gradually cooling down to become liquid. The liquid refrigerant coming out of the condenser will be rapidly depressurized when passing through the expansion valve, causing its temperature to drop sharply, becoming a low-temperature and low-pressure liquid or a gas-liquid mixture, ready to enter the evaporator. As the last link of the refrigeration cycle, the low-temperature and low-pressure refrigerant in the evaporator absorbs heat from the cooled object and evaporates into a gaseous state. This process cools the cooled object and achieves the purpose of refrigeration. At the same time, the vaporized refrigerant returns to the compressor again and starts a new cycle. The cooling water tank can be used to store coolant, which is pumped into the condenser to help take away the heat of the refrigerant, and then returns to the water tank for recooling. This design helps to maintain the stable operation of the system and can effectively utilize water resources.

[0064] See also Figure 3 , which is a schematic diagram showing the coolant flowing through the second cooling circuit according to an exemplary embodiment of the present application. Figure 3 In the figure, the dashed arrow indicates the direction of coolant flow. Figure 3It can be seen that when the coolant flows through the second cooling circuit, the refrigeration object is cooled by the refrigeration object cooling zone 102, and the coolant exchanges heat in the refrigeration object cooling zone 102. The coolant after heat exchange can flow into the refrigerator 104, and the refrigerator 104 quickly cools the coolant after heat exchange. After the coolant is quickly cooled, it can be circulated in the second cooling circuit again. Compared with the natural cooling of the coolant by the cooling box 101, the speed of cooling the coolant by the refrigerator 104 is faster, which can be applied to the working conditions where the temperature of the refrigeration object is high and needs to be cooled quickly.

[0065] In one embodiment of the present application, the refrigerator staged refrigeration system may further include: a first circulation pump 109 disposed between the refrigerator 104 and the refrigeration object cooling zone 102 .

[0066] In one embodiment of the present application, the refrigerator staged refrigeration system may further include: a second circulation pump 110 disposed between the second three-way valve 105 and the cooling box 101 .

[0067] It should be noted that the circulating pump can be used to increase the pressure of the refrigerator's staged refrigeration system to promote the circulation of the coolant in each cooling circuit to ensure that the temperature of the refrigeration object is within an appropriate temperature range.

[0068] The cooling effect of the coolant flowing through the second cooling circuit is better than that of the coolant flowing through the first cooling circuit. When the cooling demand is low, the first cooling circuit is used to cool the cooling object, which can avoid the cooling module a of the refrigerator 104 being in an underload state when the refrigerator 104 is used for cooling.

[0069] When the second cooling circuit is used to cool the refrigeration object, the refrigerator 104 and the first circulating pump 109 can work in coordination at the optimal power. The refrigerator 104 and the first circulating pump 109 can be respectively adjusted within their respective optimal operating power ranges. The optimal operating power range of the first circulating pump 109 can be 80% to 100% of the rated power, and the optimal operating power range of the refrigerator 104 can be 70% to 100% of the rated power.

[0070] In one embodiment of the present application, the refrigerator staged refrigeration system may further include: a third cooling circuit, including a cooling box 101, a second three-way valve 105, a refrigerator 104, a refrigeration object cooling zone 102, and a first three-way valve 103, which are sequentially connected through pipelines to form a loop. The second three-way valve 105 is used to divert the coolant so that the coolant flows through the first cooling circuit or the third cooling circuit.

[0071] It should be noted that the outlet end of the cooling box 101 is connected to the first end of the second three-way valve 105, the second end of the second three-way valve 105 is connected to the inlet end of the refrigerator 104, the outlet end of the refrigerator 104 is connected to the inlet end of the cooling zone 102 of the refrigeration object, and the outlet end of the cooling zone 102 of the refrigeration object is connected to the first end of the first three-way valve 103.

[0072] See also Figure 4 , which is a schematic diagram showing the coolant flowing through the third cooling circuit according to an exemplary embodiment of the present application. Figure 4 In the figure, the dashed arrow indicates the direction of coolant flow. Figure 4 It can be seen that when the coolant flows through the third cooling circuit, the coolant is cooled by the coolant object cooling zone 102, and the coolant exchanges heat in the coolant object cooling zone 102. The coolant after heat exchange can flow into the cooling box 101 for natural cooling. The coolant after natural cooling can be quickly cooled again by the refrigerator 104. After the coolant is quickly cooled, it can be circulated in the third cooling circuit again. When the third cooling circuit is used to cool the coolant object, the coolant after heat exchange is first cooled in the cooling box 101, and the refrigerator 104 can quickly cool the coolant after natural cooling in the cooling box 101. Compared with the refrigerator 104 directly cooling the coolant after heat exchange, the cooling speed of the coolant can be increased, and then the cooling speed of the coolant object can be increased, and the refrigerator 104 can be prevented from working in an overload state, thereby increasing the life of the refrigerator 104.

[0073] In one embodiment of the present application, the refrigerator staged refrigeration system may further include: a fourth cooling circuit, including a liquid inlet pipe 106, a cooling box 101, a second three-way valve 105, a refrigerator 104, a cooling area 102 for a refrigerated object, a third three-way valve 107, and a liquid discharge pipe 108, which are sequentially connected through pipelines. The coolant flowing through the cooling area 102 for a refrigerated object is discharged from the liquid discharge pipe 108, the liquid inlet pipe 106 is used to transport new coolant to the cooling box 101, and the third three-way valve 107 is used to divert the coolant so that the coolant flows through the third cooling circuit or the fourth cooling circuit.

[0074] See also Figure 5 , which is a schematic diagram showing the coolant flowing through the fourth cooling circuit according to an exemplary embodiment of the present application. Figure 5 In the figure, the dashed arrow indicates the direction of coolant flow. Figure 5It can be seen that when the coolant flows through the fourth cooling circuit, the refrigeration object is cooled by the refrigeration object cooling zone 102, and the coolant exchanges heat in the refrigeration object cooling zone 102. The coolant after heat exchange can be discharged from the refrigerator 104 graded refrigeration system through the discharge pipe 108, and the new coolant is transported to the refrigerator 104 graded refrigeration system by the inlet pipe 106. The new coolant can be quickly cooled by the refrigerator 104. After the coolant is quickly cooled, the refrigeration object can be quickly cooled. Compared with using the third cooling circuit to cool the refrigeration object, the coolant used by the refrigerator 104 in the fourth cooling circuit is lower in temperature and cools faster, which can accelerate the cooling speed of the refrigeration object.

[0075] In one embodiment of the present application, the refrigerator staged refrigeration system may further include: a first temperature detection module 111 for detecting the temperature at the outlet end of the cooling zone 102 of the refrigeration object, a second temperature detection module 112 for detecting the temperature of the cooling box 101, and a third temperature detection module 113 for detecting the refrigeration temperature of the refrigerator 104. The temperature detection module may be a temperature sensor or a thermal imager. When the temperature detection module is a temperature sensor, the first temperature detection module 111 may be arranged on the pipeline at the outlet end of the cooling zone 102 of the refrigeration object, the second temperature detection module may be arranged on the surface of the cooling box 101, and the third temperature detection module 113 may be arranged on the surface of the cooling water tank c of the refrigerator 104.

[0076] Detecting each temperature of the refrigerator staged refrigeration system can facilitate the control of the refrigerator staged refrigeration system, so as to switch each cooling circuit when the temperature meets the preset condition, and cool the refrigeration object through the corresponding cooling circuit.

[0077] Figure 6 1 is a flow chart of a refrigerator staged refrigeration method shown in an exemplary embodiment of the present application. The refrigerator staged refrigeration method can be applied to a refrigerator staged refrigeration system provided in any of the above embodiments.

[0078] like Figure 6 As shown, the exemplary refrigerator staged refrigeration method includes:

[0079] Step S610, obtaining the current temperature of the refrigeration object and the difference between the inlet and outlet temperatures of the cooling water of the refrigeration object.

[0080] In one embodiment of the present application, a target temperature detection module for detecting the current temperature of the refrigeration object can be used. When the refrigeration object is cooled by the first cooling circuit, the inlet and outlet temperature difference of the cooling water of the refrigeration object can be the temperature difference between the outlet temperature of the cooling zone of the refrigeration object and the temperature of the cooling box. When the refrigeration object is cooled by the second cooling circuit, the third cooling circuit or the fourth cooling circuit, the inlet and outlet temperature difference of the cooling water of the refrigeration object can be the temperature difference between the outlet temperature of the cooling zone of the refrigeration object and the refrigeration temperature of the refrigerator.

[0081] Step S620: If the current temperature is less than the first preset value, the primary refrigeration is started to cool the refrigeration object through the first cooling circuit.

[0082] In one embodiment of the present application, if the current temperature is less than the first preset value, the first stage of refrigeration can be started to cool the refrigeration object through the first cooling circuit. The first preset value can be determined according to the optimal power lower limit of the refrigerator and the optimal power lower limit of the first circulating pump. The optimal power lower limit can be the minimum value in the optimal operating power range. For example, when cooling the refrigeration object through the second cooling circuit, the first circulating pump and the refrigerator are controlled to operate at the optimal power lower limit, with the goal of meeting the cooling demand of the refrigeration object, and the temperature of the refrigeration object when the cooling demand of the refrigeration object can be met is determined, and the temperature of the refrigeration object is determined as the first preset value. The first preset value can also be a preset value set according to expert experience.

[0083] Step S630: If the current temperature is greater than or equal to the first preset value and less than the second preset value, the secondary refrigeration is started to cool the refrigeration object through the second cooling circuit.

[0084] In one embodiment of the present application, if the current temperature is greater than or equal to a first preset value and less than a second preset value, secondary refrigeration may be started to cool the refrigeration object through the second cooling circuit.

[0085] When the second cooling circuit is used to cool the refrigeration object, the refrigerator and the first circulation pump can work in coordination at optimal power.

[0086] Step S640, if the current temperature is greater than or equal to the second preset value and less than the third preset value, start the third-stage refrigeration or the fourth-stage refrigeration according to the inlet and outlet temperature difference of the cooling water to cool the refrigeration object through the third cooling circuit, or cool the refrigeration object through the fourth cooling circuit.

[0087] In one embodiment of the present application, if the current temperature is greater than or equal to the second preset value and less than the third preset value, the third-stage refrigeration or the fourth-stage refrigeration can be started according to the inlet and outlet temperature difference of the cooling water.

[0088] In one embodiment, if the current temperature is greater than or equal to the second preset value and less than the third preset value, the third-stage refrigeration or the fourth-stage refrigeration is started according to the cooling water inlet and outlet temperature difference, including: if the current temperature is greater than or equal to the second preset value and less than the third preset value, and the cooling water inlet and outlet temperature difference is less than or equal to the preset temperature difference, then the third-stage refrigeration is started; if the current temperature is greater than or equal to the second preset value and less than the third preset value, and the cooling water inlet and outlet temperature difference is greater than the preset temperature difference, then the fourth-stage refrigeration is started.

[0089] It should be noted that when starting the fourth-stage refrigeration, the discharge amount of the discharge pipe can be coordinated to be the same as the amount of the inlet pipe. When using the third cooling circuit and the fourth cooling circuit to cool the refrigeration object, the refrigerator, the first circulating pump, and the second circulating pump can be coordinated to work at the optimal power.

[0090] Step S650: if the current temperature is greater than or equal to the third preset value, the fourth-level refrigeration is started.

[0091] In one embodiment of the present application, if the current temperature is greater than or equal to the third preset value, the fourth-level refrigeration can be started.

[0092] In one embodiment, the process of starting the secondary refrigeration in step S630 may include steps S631 to S633.

[0093] Step S631, obtaining the temperature change rate of the refrigeration object.

[0094] In one embodiment of the present application, the temperature change rate of the refrigeration object may be obtained, and the temperature change rate may be determined by the temperature of the refrigeration object at the current moment and the temperature at the previous moment.

[0095] For example, Tn is the temperature of the cooling object at the nth moment (the temperature at the current moment), Tn-1 is the temperature of the cooling object at the n-1th moment (the temperature at the previous moment), Δt is the time difference between the nth moment and the n-1th moment, then the temperature change rate V of the cooling object is Tn =(Tn-Tn-1) / Δt.

[0096] Step S632: if the temperature change rate is greater than or equal to the preset first rate, the power of the first circulation pump is regulated.

[0097] In one embodiment of the present application, if the temperature change rate is greater than or equal to the preset first rate, the power of the first circulation pump is adjusted. When the temperature change rate is large, the cooling water flow rate can be changed by adjusting the power of the first circulation pump so that all devices in the second cooling circuit can operate in a normal state.

[0098] In one embodiment, regulating the power of the first circulation pump includes:

[0099] When the temperature change rate is a positive number, the power of the first circulation pump is increased; when the temperature change rate is a negative number, the power of the first circulation pump is reduced.

[0100] Step S633: if the temperature change rate is less than the preset first rate, the power of the refrigerator is adjusted.

[0101] In one embodiment of the present application, if the temperature change rate is less than the preset first rate, the power of the refrigerator can be adjusted. Since the refrigeration module of the refrigerator involves heat exchange, the regulation efficiency is low and there is a certain hysteresis. Therefore, when the temperature change rate is small, the refrigeration object can be cooled through the second cooling circuit by adjusting the power of the refrigerator.

[0102] In one embodiment, regulating the power of a refrigerator includes:

[0103] When the temperature change rate is positive, the power of the refrigerator is increased; when the temperature change rate is negative, the power of the refrigerator is reduced.

[0104] For example, the temperature change rate V of the cooling object can be Tn Compared with the preset value k, V Tn ≥k, adjust the power of the first circulation pump, V Tn When it is a positive number, the power of the first circulation pump is increased. Tn When V is negative, the power of the first circulation pump is reduced; Tn When <k, adjust the power of the refrigerator, V Tn When it is a positive number, it increases the power of the cooling module. Tn A negative value reduces the cooling module power.

[0105] For example, the k value is set to 0.5, Δt is set to 0.5 seconds, the temperature of the cooling object at the n-1th moment is 48.2°C, and the temperature of the cooling object at the nth moment is 48.6°C. The V Tn =0.8, which is greater than k, and then the power of the first circulation pump is increased and the flow rate of cooling water is increased to improve the refrigeration effect on the refrigeration object and timely control the temperature of the refrigeration object within the expected temperature.

[0106] During the entire control process, the first circulation pump and the refrigeration module of the refrigerator are at the optimal working power, which can not only improve energy efficiency, but also reduce maintenance, extend the service life of equipment and reduce production costs.

[0107] An embodiment of the present application also provides an electronic device, including: one or more processors; a storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, the electronic device implements the refrigerator staged refrigeration method provided in the above-mentioned embodiments.

[0108] Another aspect of the present application provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor of a computer, the computer executes the refrigerator staged refrigeration method provided in each of the above embodiments. The computer-readable storage medium may be included in the electronic device described in the above embodiments, or may exist independently without being assembled into the electronic device.

[0109] Another aspect of the present application also provides a computer program product or a computer program, the computer program product or the computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the refrigerator staged refrigeration method provided in each of the above embodiments.

[0110] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. "Including" and "comprising" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to".

[0111] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A refrigerator staged refrigeration system, characterized in that: include: a first cooling circuit, a second cooling circuit, and a third cooling circuit; The first cooling circuit includes a cooling box, a cooling area for a refrigerated object, and the first three-way valve, which are sequentially connected by pipelines to form a loop; the cooling box is used to contain a coolant; The second cooling circuit includes a refrigerator, the cooling area of ​​the cooling object, and the first three-way valve which are sequentially connected through pipelines to form a loop; the refrigerator is used to cool the coolant in the second cooling circuit; A third cooling circuit includes the cooling box, the second three-way valve, the refrigerator, the cooling area for the refrigerated object, and the first three-way valve, which are sequentially connected by pipelines to form a loop; The first three-way valve is used to divert the coolant so that the coolant flows through the first cooling circuit or the second cooling circuit; the second three-way valve is used to divert the coolant so that the coolant flows through the first cooling circuit or the third cooling circuit.

2. The refrigerator staged refrigeration system according to claim 1, characterized in that: The refrigerator staged refrigeration system also includes: A fourth cooling circuit includes a liquid inlet pipe, the cooling box, a second three-way valve, the refrigerator, the cooling area of ​​the refrigeration object, a third three-way valve, and a liquid discharge pipe connected in sequence through pipelines; Among them, the coolant flowing through the cooling zone of the refrigeration object is discharged from the drain pipe, the inlet pipe is used to transport new coolant to the cooling box, and the third three-way valve is used to divert the coolant so that the coolant flows through the third cooling circuit or the fourth cooling circuit.

3. The refrigerator staged refrigeration system according to claim 1, characterized in that: The refrigerator staged refrigeration system also includes: A first circulation pump is provided between the refrigerator and the cooling zone of the refrigeration object.

4. The refrigerator staged refrigeration system according to claim 1, characterized in that: The refrigerator staged refrigeration system also includes: A second circulating pump is arranged on the pipeline at the outlet end of the cooling box.

5. The refrigerator staged refrigeration system according to any one of claims 1 to 4, characterized in that: The refrigerator staged refrigeration system also includes: A first temperature detection module for detecting the temperature at the outlet end of the cooling zone of the refrigeration object, a second temperature detection module for detecting the temperature of the cooling box, and a third temperature detection module for detecting the refrigeration temperature of the refrigerator.

6. A refrigerator staged refrigeration method, characterized in that: Applicable to the refrigerator staged refrigeration system according to any one of claims 1 to 5, the refrigerator staged refrigeration method comprising: Get the current temperature of the cooling object and the difference between the inlet and outlet temperatures of the cooling water of the cooling object; If the current temperature is less than a first preset value, the first-stage refrigeration is started to cool the refrigeration object through the first cooling circuit; If the current temperature is greater than or equal to the first preset value and less than the second preset value, starting secondary refrigeration to cool the refrigeration object through the second cooling circuit; If the current temperature is greater than or equal to the second preset value and less than the third preset value, the third-stage refrigeration or the fourth-stage refrigeration is started according to the cooling water inlet and outlet temperature difference to cool the refrigeration object through the third cooling circuit, or the refrigeration object is cooled through the fourth cooling circuit; If the current temperature is greater than or equal to the third preset value, the fourth-stage refrigeration is started.

7. The refrigerator staged refrigeration method according to claim 6, characterized in that: If the current temperature is greater than or equal to the second preset value and less than the third preset value, starting the third-stage refrigeration or the fourth-stage refrigeration according to the cooling water inlet and outlet temperature difference, including: If the current temperature is greater than or equal to the second preset value and less than the third preset value, and the cooling water inlet and outlet temperature difference is less than or equal to the preset temperature difference, then start the third-stage refrigeration; If the current temperature is greater than or equal to the second preset value and less than the third preset value, and the cooling water inlet and outlet temperature difference is greater than the preset temperature difference, the fourth-stage refrigeration is started.

8. The refrigerator staged refrigeration method according to claim 6, characterized in that: Start secondary cooling, including: Get the temperature change rate of the refrigeration object; If the temperature change rate is greater than or equal to the preset first rate, regulating the power of the first circulation pump; If the temperature change rate is less than the preset first rate, the power of the refrigerator is regulated.

9. The refrigerator staged refrigeration method according to claim 8, characterized in that: Regulate the power of the first circulation pump, including: When the temperature change rate is a positive number, the power of the first circulation pump is increased; when the temperature change rate is a negative number, the power of the first circulation pump is reduced.

10. The refrigerator staged refrigeration method according to claim 8, characterized in that: Regulate the power of the chiller, including: When the temperature change rate is a positive number, the power of the refrigerator is increased; when the temperature change rate is a negative number, the power of the refrigerator is reduced.

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