Multifunctional temperature control system and method

Abstract

The invention discloses a multifunctional temperature control system and method.The multifunctional temperature control system comprises a PLC control system, a low-temperature temperature control unit, a high-temperature temperature control unit and a terminal temperature control unit, the low-temperature temperature control unit comprises a low-temperature terminal, and when the low-temperature terminal sends a temperature control requirement to the PLC control system, the terminal temperature control unit sends the temperature control requirement to the PLC control system; the PLC control system drives the low-temperature control unit to adjust the temperature of the low-temperature terminal and controls the temperature of the low-temperature terminal to reach a preset temperature, the high-temperature control unit comprises a high-temperature terminal, and when the high-temperature terminal sends a temperature control requirement to the PLC control system, the PLC control system drives the high-temperature control unit to adjust the temperature of the high-temperature terminal and controls the temperature of the high-temperature terminal to reach the preset temperature. According to the system and the method, the terminals with different temperature control requirements are provided, one refrigerating system and one PLC system are adopted, control over the multiple terminals can be completed, and energy consumption and cost are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a multifunctional temperature control system and method. Background Art

[0002] As new energy power stations and data centers require larger battery capacity and higher system power density, liquid cooling will account for an increasingly larger proportion. As an important means of temperature control, liquid cooling technology is widely used in heat dissipation in data centers, thermal management of new energy battery PACK systems, and temperature control of power cabinets due to its excellent heat dissipation efficiency and energy-saving characteristics.

[0003] However, traditional liquid cooling temperature control can only control one terminal with one system, resulting in multiple terminals requiring multiple sets of liquid cooling temperature control systems, increasing costs, and being unable to adjust autonomously according to the terminal temperature, increasing energy consumption. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] Therefore, the purpose of the present invention is to provide a multifunctional temperature control system and method, which has terminals with various temperature control requirements. A set of refrigeration system and PLC system can be used to control multiple terminals, saving energy consumption and cost.

[0006] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0007] A multifunctional temperature control system, comprising:

[0008] PLC control system;

[0009] The low temperature temperature control unit includes a low temperature terminal. When the low temperature terminal sends a temperature control request to the PLC control system, the PLC control system drives the low temperature temperature control unit to adjust the temperature of the low temperature terminal to control the temperature of the low temperature terminal to reach a preset temperature;

[0010] The high-temperature temperature control unit includes a high-temperature terminal. When the high-temperature terminal sends a temperature control demand to the PLC control system, the PLC control system drives the high-temperature temperature control unit to adjust the temperature of the high-temperature terminal to control the temperature of the high-temperature terminal to reach a preset temperature. When the coolant temperature of the high-temperature stabilizing control unit is higher than the set temperature, the coolant in the low-temperature temperature control unit is transported to the high-temperature stabilizing control unit through the refrigeration liquid supply unit to adjust the coolant in the high-temperature stabilizing control unit to reach the set temperature.

[0011] The terminal temperature control unit includes a plurality of terminals. The terminal temperature control unit synchronously circulates and obtains the refrigerant in the high-temperature temperature control unit to the plurality of terminals, and adjusts the temperature of the terminals to be stable at a preset temperature.

[0012] As a preferred solution of the multifunctional temperature control system described in the present invention, the low-temperature temperature control unit includes a low-temperature water tank, a first external circulation pump whose inlet is connected to the first outlet of the low-temperature water tank through a pipeline, and a first flow meter whose one end is connected to the outlet of the first external circulation pump through a pipeline, the other end of the first flow meter is connected to the liquid supply inlet of the low-temperature terminal through a pipeline, and the first inlet of the low-temperature water tank is connected to the liquid supply outlet of the low-temperature terminal through a pipeline;

[0013] The low-temperature terminal is provided with a low-temperature temperature control module. When the temperature control module detects that the low-temperature terminal is higher than the set temperature, the PLC control system drives the high-temperature temperature control unit to adjust the temperature of the high-temperature terminal to control the temperature of the high-temperature terminal to reach the preset temperature.

[0014] As a preferred solution of the multifunctional temperature control system described in the present invention, the flow rate of the external circulation pump is regulated by a model-free self-building tree algorithm, which takes the temperature of the low-temperature terminal as the target, reduces the flow rate when the temperature is higher than the set temperature, and increases the flow rate when the temperature is lower than the set temperature. Through PID regulation, the temperature is controlled to not rise within a preset range.

[0015] As a preferred solution of a multifunctional temperature control system described in the present invention, the refrigeration liquid supply unit includes an evaporator whose refrigerant inlet is connected to the second outlet of the low-temperature water tank of the low-temperature temperature control unit, an internal circulation pump whose inlet is connected to the refrigerant outlet of the evaporator, a first one-way valve whose inlet is connected to the outlet of the internal circulation pump, an electric three-way shunt regulating valve whose two outlets are respectively connected to the inlets of the low-temperature water tank of the low-temperature temperature control unit and the high-temperature water tank of the high-temperature temperature control unit, and a refrigeration system connected to the refrigerant inlet and inlet of the evaporator;

[0016] Among them, when the low-temperature water tank has not reached the preset temperature, the internal circulation pump uses the maximum output to maximize the heat exchange flow through the evaporator, so as to achieve the purpose of the low-temperature water tank reaching the target quickly. When the low-temperature water tank reaches the preset temperature, the internal circulation pump maintains low-frequency operation to reduce the heat exchange of the refrigeration system;

[0017] When the temperature Tg of the high-temperature water tank is greater than T0, the electric three-way regulating valve will open to connect the internal circulation pump and the high-temperature water tank, and the internal circulation pump will transport the coolant from the low-temperature water tank to the high-temperature water tank.

[0018] As a preferred solution of the multifunctional temperature control system described in the present invention, the height of the high-temperature water tank is higher than that of the low-temperature water tank, and the high-temperature water tank is connected to the low-temperature water tank through a pipeline, a high-temperature electric switch valve and a second one-way valve. When the water level entering the high-temperature water tank is higher than a predetermined height, the high-temperature electric switch valve and the second one-way valve are opened to allow the water in the high-temperature water tank to flow back into the low-temperature water tank.

[0019] As a preferred solution of a multifunctional temperature control system described in the present invention, the high-temperature temperature control unit includes a high-temperature water tank, a second external circulation pump whose inlet is connected to the first outlet of the high-temperature water tank through a pipeline, and a second flow meter whose one end is connected to the outlet of the second external circulation pump through a pipeline, the other end of the second flow meter is connected to the liquid supply inlet of the high-temperature terminal through a pipeline, and the first inlet of the high-temperature water tank is connected to the liquid supply outlet of the high-temperature terminal through a pipeline.

[0020] As a preferred solution of the multifunctional temperature control system described in the present invention, the terminal temperature control unit includes a third external circulation pump connected to the outlet of the high-temperature water tank of the high-temperature temperature control unit, and an electric switch valve, an electronic pump and a third flow meter arranged on the pipeline between each terminal inlet and the outlet of the third external circulation pump;

[0021] Wherein, a third one-way valve is provided on the pipeline between the terminal and the inlet of the high-temperature water tank.

[0022] A multifunctional temperature control method, the specific steps are as follows:

[0023] S1, low temperature control mode: the refrigeration system is started and the three-way shunt regulating valve is moved to disconnect the internal circulation pump from the high temperature water tank, and connect the internal circulation pump to the low temperature water tank. Through the heat exchange of the evaporator, the internal circulation pump is used to transport the water, so that the temperature of the low temperature water tank is controlled within the low temperature range. When the low temperature terminal issues a temperature control demand, the PLC control system starts the first external circulation pump after receiving the control command, and adjusts the output power of the first external circulation pump through the inverter to adjust the flow delivered to the low temperature terminal and control the temperature of the low temperature terminal. The flow is adjusted by a model-free self-building tree algorithm, with the temperature of the low temperature terminal as the target. If the flow is higher than the set temperature, it is reduced, and if it is lower than the set temperature, it is increased. Through PID regulation, the temperature is controlled within a certain range and does not rise. The internal circulation pump adjusts the flow delivered to the low temperature water tank through the inverter. When the low temperature water tank does not reach the preset temperature, the inverter uses the maximum output, and the heat exchange flow through the evaporator is the maximum, so that the low temperature water tank can quickly reach the target. When the low temperature water tank reaches the preset temperature, the inverter maintains low-frequency operation, reduces the power of the internal circulation pump, reduces the heat exchange of the refrigeration system, and the load power consumption of the refrigeration system is reduced accordingly.

[0024] S2, high temperature control mode: when the high temperature terminal sends a temperature control demand to the PLC control system, the PLC control system drives the second external circulation pump to start, and transports the coolant in the high temperature water tank to the high temperature terminal, and controls the temperature of the high temperature terminal within the preset temperature range. When the temperature Tg of the high temperature water tank is greater than T0, the electric three-way regulating valve opens to connect the internal circulation pump and the high temperature water tank, and the internal circulation pump transports the liquid in the low temperature water tank to the high temperature water tank. The larger Tg-T0 is, the larger the opening of the electric three-way regulating valve connected to the high temperature water tank is, and the temperature of the high temperature water tank is controlled. The smaller Tg-T0 is, the smaller the opening of the electric three-way regulating valve connected to the high temperature water tank is. Tg=T0, the opening of the electric three-way regulating valve connected to the high temperature water tank is equal to;

[0025] S3, terminal control mode: The high-temperature water tank supplies water to the terminal temperature control unit synchronously, and the liquid coolant is transported to each terminal by the third external circulation pump to control the temperature of the terminal. At the same time, each electronic pump is turned on when the liquid supply pressure is insufficient to ensure that the flow rate temperature remains constant. When the terminal temperature is lower than the preset value, the electric switch valve is closed to save energy output.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The low temperature control unit and the high temperature control unit meet the different needs of the low temperature and high temperature systems through the switching of the electric three-way valve and the electric switch valve respectively. The low temperature control unit is automatically controlled and adjusted by the refrigeration system. The high temperature control unit is transported by the low temperature control unit, and the water temperature of the high temperature unit is maintained through valve control and adjustment to achieve automatic adjustment. It is transported to the unit with the required temperature control through the circulation pump.

[0028] 2. The internal circulation pump adjusts the flow rate delivered to the low-temperature water tank through the inverter. When the low-temperature water tank has not reached the preset temperature, the inverter uses the maximum output, and the heat exchange flow through the evaporator is the maximum, so that the water tank can quickly reach the target. When the low-temperature water tank reaches the preset temperature, the inverter maintains low-frequency operation, reduces the power of the pump, reduces the heat exchange of the refrigeration system, and the load power consumption of the refrigeration system is reduced accordingly.

[0029] 3. The high-temperature temperature control unit, the low-temperature temperature control unit and the chiller adopt an integrated skid design, which is convenient for installation and maintenance. It has the characteristics of decentralized control, centralized management, full digitalization of control devices and field instruments, easy installation and low cost, and intelligent maintenance and management.

[0030] 4. The high temperature water tank is located higher than the low temperature water tank. When the liquid level in the high temperature water tank reaches a certain height, it flows back into the low temperature water tank to maintain balance.

[0031] 5. Through the combination of circulation pump and flow meter, the flow rate is adjusted to maintain the temperature of the terminal heating process. Each terminal unit is equipped with a small electronic pump, which is turned on when the liquid supply pressure is insufficient to ensure that the flow rate and temperature remain constant. The external circulation pump adopts fixed frequency control, and the terminal small electronic pump adopts variable frequency PID adjustment to maintain the temperature control of each terminal unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0033] Figure 1 It is a structural schematic diagram of a multifunctional temperature control system of the present invention. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] The present invention provides a multifunctional temperature control system and method. With terminals having various temperature control requirements, a set of refrigeration system and PLC system can be used to control multiple terminals, thereby saving energy consumption and cost.

[0038] Example 1

[0039] like Figure 1 As shown, a multifunctional temperature control system of the present invention includes a PLC control system, a low-temperature temperature control unit 100, a high-temperature temperature control unit 200, a refrigeration liquid supply unit 300 and a terminal temperature control unit 400.

[0040] Low temperature temperature control unit 100 The low temperature temperature control unit 100 includes a low temperature water tank 120, a first external circulation pump 130 whose inlet is connected to the first outlet of the low temperature water tank 120 through a pipeline, and a first flow meter 140 whose one end is connected to the outlet of the first external circulation pump 130 through a pipeline. The other end of the first flow meter 140 is connected to the liquid supply inlet of the low temperature terminal 110 through a pipeline. The first inlet of the low temperature water tank 120 is connected to the liquid supply outlet of the low temperature terminal 110 through a pipeline. A low temperature temperature control module is arranged in the low temperature terminal 110. When the temperature control module detects that the low temperature terminal 110 is higher than the set temperature, the PLC control system drives the high temperature temperature control unit 200 to adjust the temperature of the high temperature terminal 210 to control the temperature of the high temperature terminal 110 to reach the preset temperature. The flow rate of the first external circulation pump 130 is adjusted by a model-free self-building tree algorithm, with the temperature of the low temperature terminal 110 as the target. When the temperature is higher than the set temperature, the flow rate is reduced, and when the temperature is lower than the set temperature, the flow rate is increased. Through PID adjustment, the temperature is controlled not to rise within a preset range.

[0041] The high temperature temperature control unit 200 includes a high temperature terminal 210. When the high temperature terminal 210 sends a temperature control demand to the PLC control system, the PLC control system drives the high temperature temperature control unit 200 to adjust the temperature of the high temperature terminal 210, and controls the temperature of the high temperature terminal 110 to reach a preset temperature. When the coolant temperature of the high temperature stabilizing control unit 200 is higher than the set temperature, the coolant in the low temperature temperature control unit 100 is transported to the high temperature stabilizing control unit 200 through the refrigeration liquid supply unit 300, and the coolant in the high temperature stabilizing control unit 200 is adjusted to reach the set temperature.

[0042] The refrigeration liquid supply unit 300 includes an evaporator 310 whose refrigerant inlet is connected to the second outlet of the low-temperature water tank 120 of the low-temperature temperature control unit 100, an internal circulation pump 320 whose inlet is connected to the refrigerant outlet of the evaporator 310, a first one-way valve 330 whose inlet is connected to the outlet of the internal circulation pump 320, an electric three-way flow-dividing regulating valve 340 whose two outlets are respectively connected to the inlets of the low-temperature water tank 120 of the low-temperature temperature control unit 100 and the high-temperature water tank 220 of the high-temperature temperature control unit 200, and a refrigeration system 340 connected to the refrigerant inlet and the inlet of the evaporator 310. system 350, wherein, when the low-temperature water tank 120 has not reached the preset temperature, the internal circulation pump 320 adopts the maximum output, so that the heat exchange flow through the evaporator 310 is maximized, so as to achieve the purpose of the low-temperature water tank 120 quickly reaching the target. When the low-temperature water tank 120 reaches the preset temperature, the internal circulation pump 320 maintains low-frequency operation to reduce the heat exchange of the refrigeration system 350; when the temperature Tg of the high-temperature water tank 220 is greater than TO, the electric three-way regulating valve 340 will open the opening, connecting the internal circulation pump 320 and the high-temperature water tank 220, and the internal circulation pump 320 will transport the coolant in the low-temperature water tank 120 to the high-temperature water tank 220.

[0043] The terminal temperature control unit 400 includes multiple terminals 410. The terminal temperature control unit 400 synchronously circulates to obtain the refrigerant in the high-temperature temperature control unit 200 to multiple terminals 310, and adjusts the temperature of the terminal 310 to be stable at a preset temperature. Specifically, the terminal temperature control unit 400 includes a third external circulation pump 420 connected to the outlet of the high-temperature water tank 220 of the high-temperature temperature control unit 200, and an electric switching valve 430, an electronic pump 440 and a third flow meter 450 arranged on the pipeline between the inlet of each terminal 410 and the outlet of the third external circulation pump 420, wherein a third one-way valve 460 is provided on the pipeline between the terminal 410 and the inlet of the high-temperature water tank 220.

[0044] Example 2

[0045] The present invention also provides a multifunctional temperature control method, the specific steps are as follows:

[0046] S1, low temperature control mode: the refrigeration system 350 is turned on and running, the three-way diverter regulating valve 340 is moved to disconnect the internal circulation pump 320 from the high temperature water tank 220, and connect the internal circulation pump 320 with the low temperature water tank 120, and heat is exchanged through the evaporator 310, and the internal circulation pump 320 is delivered to control the temperature of the low temperature water tank 120 within the low temperature range; when the low temperature terminal 110 issues a temperature control demand, the PLC control system starts the first external circulation pump 130 after receiving the control command, and adjusts the output power of the first external circulation pump 130 through the inverter to adjust the flow delivered to the low temperature terminal 110, and control the temperature of the low temperature terminal 110. The flow is adjusted using a model-free self-building tree algorithm , taking the temperature of the low-temperature terminal 110 as the target, the flow rate is reduced when it is higher than the set temperature, and increased when it is lower than the set temperature. Through PID regulation, the temperature is controlled within a certain range and does not rise. The internal circulation pump 320 adjusts the flow rate delivered to the low-temperature water tank 120 through the inverter. When the low-temperature water tank 120 does not reach the preset temperature, the inverter adopts the maximum output, and the heat exchange flow through the evaporator 310 is the largest, so that the low-temperature water tank 120 can quickly reach the target. When the low-temperature water tank 120 reaches the preset temperature, the inverter maintains low-frequency operation, reduces the power of the internal circulation pump 320, reduces the heat exchange of the refrigeration system 350, and the load power consumption of the refrigeration system 350 is reduced accordingly;

[0047] S2, high temperature control mode: when the high temperature terminal 210 sends a temperature control demand to the PLC control system, the PLC control system drives the second external circulation pump 230 to open, and transports the coolant in the high temperature water tank 220 to the high temperature terminal 210, and controls the temperature of the high temperature terminal 210 within a preset temperature range. When the temperature Tg of the high temperature water tank 220 is greater than TO, the electric three-way regulating valve 340 opens to connect the internal circulation pump 320 and the high temperature water tank 220, and the internal circulation pump 320 transports the liquid in the low temperature water tank 120 to the high temperature water tank 220. The larger Tg-T0 is, the larger the opening of the electric three-way regulating valve 340 connected to the high temperature water tank 220 is, and the temperature of the high temperature water tank 220 is controlled. The smaller Tg-T0 is, the smaller the opening of the electric three-way regulating valve 340 connected to the high temperature water tank 220 is. Tg=T0, and the opening of the electric three-way regulating valve 340 connected to the high temperature water tank 220 is equal to 0;

[0048] S3, terminal control mode: the high temperature water tank 220 synchronously supplies water to the terminal temperature control unit 400, and the liquid coolant is transported to each terminal 410 by the third external circulation pump 420 to control the temperature of the terminal 410. At the same time, each electronic pump 440 is turned on when the liquid supply pressure is insufficient to ensure that the flow rate temperature remains constant. When the temperature of the terminal 410 is lower than the preset value, the electric switch valve 430 is closed to save energy output.

[0049] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multifunctional temperature control system, It is characterized in that include: PLC control system; A low temperature temperature control unit (100) comprises a low temperature terminal (110); when the low temperature terminal (110) sends a temperature control demand to the PLC control system, the PLC control system drives the low temperature temperature control unit (100) to adjust the temperature of the low temperature terminal (110), and controls the temperature of the low temperature terminal (110) to reach a preset temperature; The high-temperature temperature control unit (200) comprises a high-temperature terminal (210). When the high-temperature terminal (210) sends a temperature control demand to the PLC control system, the PLC control system drives the high-temperature temperature control unit (200) to adjust the temperature of the high-temperature terminal (210), and controls the temperature of the high-temperature terminal (110) to reach a preset temperature. When the coolant temperature of the high-temperature stabilizing control unit (200) is higher than the set temperature, the coolant in the low-temperature temperature control unit (100) is transported to the high-temperature stabilizing control unit (200) through the refrigeration liquid supply unit (300), and the coolant in the high-temperature stabilizing control unit (200) is adjusted to reach the set temperature. The terminal temperature control unit (400) comprises a plurality of terminals (410). The terminal temperature control unit (400) synchronously circulates and obtains the refrigerant in the high-temperature temperature control unit (200) to the plurality of terminals (410), and adjusts the temperature of the terminal (410) to be stable at a preset temperature.

2. A multifunctional temperature control system according to claim 1, It is characterized in that The low-temperature temperature control unit (100) comprises a low-temperature water tank (120), a first external circulation pump (130) whose inlet is connected to a first outlet of the low-temperature water tank (120) through a pipeline, and a first flow meter (140) whose one end is connected to the outlet of the first external circulation pump (130) through a pipeline, the other end of the first flow meter (140) is connected to a liquid supply inlet of a low-temperature terminal (110) through a pipeline, and the first inlet of the low-temperature water tank (120) is connected to a liquid supply outlet of the low-temperature terminal (110) through a pipeline; The low-temperature terminal (110) is provided with a low-temperature temperature control module. When the temperature control module detects that the low-temperature terminal (110) is higher than a set temperature, the PLC control system drives the high-temperature temperature control unit (200) to adjust the temperature of the high-temperature terminal (210), thereby controlling the temperature of the high-temperature terminal (110) to reach a preset temperature.

3. A multifunctional temperature control system according to claim 2, It is characterized in that The flow rate of the first external circulation pump (130) is regulated by a model-free self-building tree algorithm, with the temperature of the low-temperature terminal (110) as the target. When the temperature is higher than the set temperature, the flow rate is reduced, and when the temperature is lower than the set temperature, the flow rate is increased. Through PID regulation, the temperature is controlled to not rise within a preset range.

4. A multifunctional temperature control system according to claim 1, It is characterized in that The refrigeration liquid supply unit (300) comprises an evaporator (310) whose refrigerant inlet is connected to the second outlet of the low-temperature water tank (120) of the low-temperature temperature control unit (100), an internal circulation pump (320) whose inlet is connected to the refrigerant outlet of the evaporator (310), a first one-way valve (330) whose inlet is connected to the outlet of the internal circulation pump (320), an electric three-way flow-dividing regulating valve (340) whose inlet is connected to the outlet of the first one-way valve (330), and whose two outlets are respectively connected to the inlets of the low-temperature water tank (120) of the low-temperature temperature control unit (100) and the high-temperature water tank (220) of the high-temperature temperature control unit (200), and a refrigeration system (350) connected to the refrigerant inlet and inlet of the evaporator (310); When the low-temperature water tank (120) has not reached a preset temperature, the internal circulation pump (320) uses a maximum output to maximize the heat exchange flow through the evaporator (310), so as to achieve the purpose of quickly reaching the target temperature for the low-temperature water tank (120); when the low-temperature water tank (120) reaches a preset temperature, the internal circulation pump (320) maintains a low-frequency operation to reduce the heat exchange of the refrigeration system (350); When the temperature Tg of the high-temperature water tank (220) is greater than TO, the electric three-way regulating valve (340) will open to connect the internal circulation pump (320) and the high-temperature water tank (220), and the internal circulation pump (320) will transport the coolant in the low-temperature water tank (120) to the high-temperature water tank (220).

5. A multifunctional temperature control system according to claim 4, It is characterized in that The height of the high-temperature water tank (220) is higher than that of the low-temperature water tank (120). The high-temperature water tank (220) is connected to the low-temperature water tank (120) via a pipeline, a high-temperature electric switch valve (220a) and a second one-way valve (220b). When the water level entering the high-temperature water tank (220) is higher than a predetermined height, the high-temperature electric switch valve (220a) and the second one-way valve (220b) are opened to allow the water in the high-temperature water tank (220) to flow back into the low-temperature water tank (120).

6. A multifunctional temperature control system according to claim 1, It is characterized in that The high-temperature temperature control unit (200) comprises a high-temperature water tank (220), a second external circulation pump (230) whose inlet is connected to a first outlet of the high-temperature water tank (220) through a pipeline, and a second flow meter (240) whose one end is connected to the outlet of the second external circulation pump (230) through a pipeline, the other end of the second flow meter (240) is connected to the liquid supply inlet of the high-temperature terminal (210) through a pipeline, and the first inlet of the high-temperature water tank (220) is connected to the liquid supply outlet of the high-temperature terminal (210) through a pipeline.

7. A multifunctional temperature control system according to claim 1, It is characterized in that The terminal temperature control unit (400) comprises a third external circulation pump (420) connected to the outlet of the high-temperature water tank (220) of the high-temperature temperature control unit (200), and an electric switch valve (430), an electronic pump (440) and a third flow meter (450) arranged on the pipeline between the inlet of each terminal (410) and the outlet of the third external circulation pump (420); Wherein, a third one-way valve (460) is provided on the pipeline between the terminal (410) and the inlet of the high-temperature water tank (220).

8. A method of a multifunctional temperature control system as claimed in any one of claims 1 to 7, It is characterized in that The specific steps are as follows: S1, low temperature control mode: the refrigeration system (350) is started and operated, the three-way flow diversion regulating valve (340) is driven to disconnect the internal circulation pump (320) from the high temperature water tank (220), and connect the internal circulation pump (320) to the low temperature water tank (120), and heat is exchanged through the evaporator (310), and the internal circulation pump (320) is used to transport the heat, so that the temperature of the low temperature water tank (120) is controlled within a low temperature range; when the low temperature terminal (110) issues a temperature control demand, the PLC control system starts the first external circulation pump (130) after receiving the control command, and adjusts the output power of the first external circulation pump (130) through the frequency converter to adjust the flow delivered to the low temperature terminal (110) and control the temperature of the low temperature terminal (110). The flow is adjusted by a model-free automatic An algorithm is constructed, with the temperature of the low-temperature terminal (110) as the target. When the temperature is higher than the set temperature, the flow rate is reduced, and when the temperature is lower than the set temperature, the flow rate is increased. Through PID regulation, the temperature is controlled within a certain range so as not to rise. The internal circulation pump (320) adjusts the flow rate delivered to the low-temperature water tank (120) through the frequency converter. When the low-temperature water tank (120) does not reach the preset temperature, the frequency converter adopts the maximum output, and the heat exchange flow rate through the evaporator (310) is the maximum, so as to achieve the purpose of the low-temperature water tank (120) quickly reaching the target. When the low-temperature water tank (120) reaches the preset temperature, the frequency converter maintains low-frequency operation, reduces the power of the internal circulation pump (320), reduces the heat exchange of the refrigeration system (350), and the load power consumption of the refrigeration system (350) is reduced accordingly. S2, high temperature control mode: when the high temperature terminal (210) sends a temperature control request to the PLC control system, the PLC control system drives the second external circulation pump (230) to start, and delivers the coolant in the high temperature water tank (220) to the high temperature terminal (210), and controls the temperature of the high temperature terminal (210) within a preset temperature range. When the temperature Tg of the high temperature water tank (220) is greater than TO, the electric three-way regulating valve (340) opens to connect the internal circulation pump (320) and the high temperature water tank (220). ), the internal circulation pump (320) transports the liquid in the low-temperature water tank (120) to the high-temperature water tank (220); the larger the Tg-T0, the larger the opening of the portion of the electric three-way regulating valve (340) connected to the high-temperature water tank (220), thereby controlling the temperature of the high-temperature water tank (220); the smaller the Tg-T0, the smaller the opening of the portion of the electric three-way regulating valve (340) connected to the high-temperature water tank (220); when Tg=T0, the opening of the portion of the electric three-way regulating valve (340) connected to the high-temperature water tank (220) is equal to 0; S3, terminal control mode: the high-temperature water tank (220) synchronously supplies water to the terminal temperature control unit (400), and the liquid coolant is transported to each terminal (410) by the third external circulation pump (420) to control the temperature of the terminal (410). At the same time, each electronic pump (440) is turned on when the liquid supply pressure is insufficient to ensure that the flow rate temperature remains constant. When the temperature of the terminal (410) is lower than a predetermined value, the electric switch valve (430) is closed to save energy output.

Images