Refrigerating and heating system and control method thereof

Abstract

This invention relates to the technical field of rectifier plate temperature control, and discloses a refrigeration and heating system and its control method for adjusting the temperature of a rectifier plate. The rectifier plate includes multiple sets of parallel flow channel groups, with different flow channel resistances in different sets. The refrigeration and heating system includes a temperature control loop and a circulation loop connected by heat exchange. An ejector device is provided on the circulation loop, with its return side connected to the rectifier plate outlet side. Multiple connecting pipes are provided on the output side of the ejector device, each connecting pipe connecting to a set of flow channel groups on the rectifier plate inlet side. Each connecting pipe is equipped with a first valve, which is used to adjust the flow rate of the circulating medium within the connecting pipe. This invention's refrigeration and heating system and its control method, by adjusting the opening of the first valve, ensures that the total resistance of each flow channel group is the same, thereby solving the problem of uneven temperature distribution caused by uneven flow distribution within the rectifier plate, and thus bringing the actual temperature of each flow channel group closer to the target temperature.

Description

Technical Field

[0001] This invention relates to the technical field of rectifier plate temperature control, and in particular to a refrigeration and heating system and its control method. Background Technology

[0002] During the vapor deposition process, graphite powder volatilized from the glass substrate at high temperatures accumulates on the low-temperature rectifier plate, forming solid condensates. Therefore, the rectifier plate needs to be periodically and rapidly heated to 60°C for cleaning, and then cooled to 5°C before entering the process mode. Existing technologies typically use electric heating to heat the circulating medium to achieve the desired temperature, followed by cooling through a refrigeration system. However, this method suffers from high heat consumption, long heating / cooling times, and low system energy efficiency.

[0003] Furthermore, there is the technical problem of uneven temperature distribution in the rectifier plate. The root cause lies in the uneven flow distribution among the parallel channels within the rectifier plate: on the one hand, manufacturing factors such as dimensional tolerances, roughness differences, and burrs during channel processing lead to random differences in the geometric resistance of each channel; on the other hand, the inlet manifold diversion effect and the outlet manifold confluence effect result in a larger flow rate in channels closer to the inlet or outlet and a smaller flow rate in channels farther from the inlet or outlet. This positional effect cannot be eliminated even if the channel geometry is exactly the same. The combination of these two factors results in channels with low resistance or advantageous positions having a larger flow rate and excessive heat exchange, while channels with high resistance or unfavorable positions have a smaller flow rate and insufficient heat exchange. Ultimately, this leads to inconsistent heating rates in heating mode and uneven cooling in cooling mode, affecting cleaning performance and process stability. Summary of the Invention

[0004] Therefore, the purpose of this invention is to overcome the problem of uneven flow distribution in parallel channels during the actual operation of the rectifier, which leads to uneven temperature distribution in the rectifier. This invention provides a cooling and heating system and its control method, which groups the channels of the rectifier according to their resistance and sets an independent first valve for each group. By adjusting the opening of the first valve, the total resistance of each channel group is made the same, thereby solving the problem of uneven temperature distribution caused by uneven flow distribution within the rectifier and making the actual temperature of each channel group approach the target temperature.

[0005] To address the aforementioned technical problems, this invention provides a refrigeration and heating system for regulating the temperature of a rectifier plate. The rectifier plate includes multiple sets of parallel flow channel groups, each with different flow channel resistances. The refrigeration and heating system includes a temperature control loop and a circulation loop connected by a heat exchange connection. The circulation loop is equipped with an ejector device, the return side of which is connected to the outlet side of the rectifier plate. The output side of the ejector device is equipped with multiple connecting pipes, each connecting pipe connecting to a set of flow channel groups on the inlet side of the rectifier plate. Each connecting pipe is equipped with a first valve, which is used to regulate the flow rate of the circulating medium within the connecting pipe, so that the actual temperature of each flow channel group approaches the target temperature.

[0006] Preferably, when the cooling and heating system is used for heating the rectifier plate, the circulation loop is sequentially provided with: a first circulation branch, the first end of which is connected to the liquid storage unit; a second regulating valve is provided on the first circulation branch; a second circulation branch, on which a water pump is provided; the ejector device is located on the outlet side of the water pump; a third circulation branch, the first end of which is connected to the output side of the ejector device; a third regulating valve is provided on the third circulation branch; the second end of the third circulation branch is connected to the first heat exchange channel of the third heat exchanger and then connected to the inlet side of the rectifier plate; a fourth circulation branch; and a fourth circulation branch. The fourth circulation branch has its first end connected to the outlet side of the rectifier plate; the fourth circulation branch is connected to the first heat exchange channel of the fourth heat exchanger; the second end of the fourth circulation branch is connected to the return gas side of the ejector device; when the refrigeration and heating system is used for refrigeration of the rectifier plate, the circulation loop further includes: a fifth circulation branch; the first end of the fifth circulation branch is connected to the upper part of the gas-liquid separator, the top of the gas-liquid separator is connected to the liquid storage unit, and the bottom of the gas-liquid separator is connected to the first end of the second circulation branch; the second end of the fifth circulation branch is connected to the first end of the third circulation branch.

[0007] Preferably, when the refrigeration and heating system is used for cooling the rectifier plate, the temperature control circuit includes: a first temperature control branch, the first end of which is connected to the S end of a four-way reversing valve; a compressor is provided on the first temperature control branch; the second end of the first temperature control branch is connected to the D end of the four-way reversing valve; a second temperature control branch, the first end of which is connected to the E end of the four-way reversing valve, and the second temperature control branch is connected to the first heat exchange channel of a second heat exchanger; a first regulating valve is provided on the second temperature control branch, the first regulating valve is connected in parallel with the first heat exchange channel of the first heat exchanger, and the second heat exchange channel of the first heat exchanger is connected to the liquid storage unit; the second end of the second temperature control branch is connected to the first side of a one-way valve assembly; wherein, the one-way valve assembly The system includes a series-connected one-way valve and a second expansion valve; a third temperature control branch, the first end of which is connected to the second side of the one-way valve assembly, the third temperature control branch is connected to the second heat exchange channel of the third heat exchanger, and the second end of which is connected to the C end of the four-way reversing valve; when the refrigeration and heating system is used for heating the rectifier plate, the temperature control circuit further includes: a fourth temperature control branch; the first end of the fourth temperature control branch merges with the first end of the third temperature control branch and is jointly connected to the second side of the one-way valve assembly; a third expansion valve is provided on the fourth temperature control branch; the second end of the fourth temperature control branch is connected to the second heat exchange channel of the fourth heat exchanger, merges with the first end of the second temperature control branch, and is jointly connected to the E end of the four-way reversing valve.

[0008] Preferably, the temperature control circuit further includes: a bypass branch; the first end of the bypass branch and the first end of the third temperature control branch are connected together to the second side of the one-way valve assembly; a first expansion valve is provided on the bypass branch; the second end of the bypass branch and the first end of the second temperature control branch are connected together to the E end of the four-way reversing valve.

[0009] On the other hand, the present invention provides a control method for a refrigeration and heating system, comprising: before the refrigeration and heating system is started: setting the initial opening degree of the corresponding first valve according to the flow resistance of each flow channel group; after the refrigeration and heating system is started: acquiring the actual temperature of each flow channel group, and adjusting the opening degree of the corresponding first valve according to the deviation between the actual temperature and the target temperature, so that the actual temperature of each flow channel group approaches the target temperature.

[0010] Preferably, the method for setting the initial opening of the first valve includes: supplying water to the rectifier plate at a preset pressure, and measuring the flow rate of each flow channel group and the pressure difference between the inlet and outlet sides of each flow channel group; determining the flow resistance of each flow channel group based on the pressure difference between the inlet and outlet sides of the flow channel group and the flow rate of the flow channel group; determining the resistance coefficient of each flow channel group based on the maximum flow resistance, the minimum flow resistance, and the flow resistance of the current flow channel group; and determining the initial opening of each first valve based on the preset basic opening, the opening adjustment range, and the resistance coefficient.

[0011] Preferably, the method for adjusting the opening of the first valve includes: determining the heat exchange state of the flow channel group based on the deviation between the actual temperature and the target temperature according to the current working mode of the refrigeration and heating system; wherein the working mode is a heating mode or a cooling mode; the heat exchange state is insufficient heat exchange or excessive heat exchange; adjusting the opening of the first valve according to the deviation between the actual temperature and the target temperature and the heat exchange state, so that the actual temperature of each flow channel group approaches the target temperature: when the heat exchange is insufficient, increasing the opening of the first valve; when the heat exchange is excessive, decreasing the opening of the first valve.

[0012] Preferably, when the refrigeration and heating system is used for cooling the rectifier plate, the control method further includes: in the temperature control circuit: connecting the D end and E end of the four-way reversing valve, connecting the S end and C end, and closing the third expansion valve; turning off the fan of the second heat exchanger and closing the first regulating valve; starting the compressor, so that the refrigerant exchanges heat with the circulating medium stored in the liquid storage unit through the first heat exchanger; when the temperature of the circulating medium in the liquid storage unit rises to the first preset temperature, turning on the fan of the second heat exchanger and the first regulating valve, so that the refrigerant flows sequentially through the one-way valve assembly and the first... The three heat exchangers cool the circulating medium before it enters the C terminal of the four-way reversing valve. In the circulation loop: the second regulating valve is closed and the water pump is started to provide power to the ejector device. The ejector device ejects the circulating medium from the fourth heat exchanger. The circulating medium is divided into two paths at the output side of the ejector device: one path enters the gas-liquid separator and then re-enters the water pump; the other path enters the third heat exchanger for heat exchange and cooling, then enters the rectifier plate to absorb the heat from the rectifier plate. The circulating medium flowing through the rectifier plate returns to the ejector device through the fourth heat exchanger.

[0013] Preferably, when the refrigeration and heating system is used for heating the rectifier plate, the control method further includes: in the circulation loop: when the temperature of the circulating medium in the liquid storage unit is greater than or equal to the first preset temperature, the second regulating valve is opened to allow the circulating medium stored in the liquid storage unit to participate in the circulation; when the temperature of the circulating medium in the liquid storage unit is less than the first preset temperature, the second regulating valve is closed; in the temperature control loop: the D end of the four-way reversing valve is connected to the C end, and the E end is connected to the S end; the compressor is started, so that the refrigerant exchanges heat with the circulating medium through the third heat exchanger. The refrigerant after passing through the third heat exchanger is divided into two paths: one path of refrigerant flows sequentially through the third expansion valve and the fourth heat exchanger, and after exchanging heat and cooling the circulating medium, it enters the E end of the four-way reversing valve; the other path of refrigerant flows sequentially through the one-way valve assembly and the second circulation branch to regulate the temperature of the circulating medium in the liquid storage unit.

[0014] Preferably, when the refrigeration and heating system needs to switch from heating mode to cooling mode, the control method further includes: in the temperature control loop: when the temperature of the circulating medium in the liquid storage unit is less than the second preset temperature, the first regulator is turned on and the fan of the second heat exchanger is turned off, so that the refrigerant flows through the second heat exchanger and absorbs heat from the air before entering the E end of the four-way reversing valve; when the temperature of the circulating medium in the liquid storage unit is greater than or equal to the second preset temperature, the first regulator is turned off and the fan of the second heat exchanger is turned on, so that the refrigerant flows through the first heat exchanger to cool the circulating medium before entering the E end of the four-way reversing valve; in the circulation loop: when the temperature of the circulating medium in the liquid storage unit is less than the third preset temperature, the second regulator valve is turned on, so that the circulating medium stored in the liquid storage unit participates in the circulation; when the temperature of the circulating medium in the liquid storage unit is greater than or equal to the third preset temperature, the second regulator valve is turned off.

[0015] Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: The cooling and heating system of the present invention groups the flow channels of the rectifier plate according to the flow channel resistance and sets an independent first valve for each group. This can simultaneously compensate for the random differences caused by manufacturing tolerances and the systematic differences caused by position effects, so as to solve the problem of uneven temperature distribution caused by uneven flow distribution inside the rectifier plate, and thus make the actual temperature of each flow channel group approach the target temperature.

[0016] The control method of the refrigeration and heating system of the present invention sets the initial opening degree of the corresponding first valve according to the flow channel resistance before startup to achieve pre-compensation, so that the system can quickly enter a near-ideal working state and reduce the number of subsequent debugging iterations; after startup, the opening degree of the first valve is dynamically adjusted according to the deviation between the actual temperature and the target temperature of each flow channel group to compensate for the pre-compensation error and the changes in operating conditions during operation, so that the actual temperature of each flow channel group approaches the target temperature. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a refrigeration and heating system in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of another structure of the refrigeration and heating system in an embodiment of the present invention.

[0020] Figure 3 This is a schematic flowchart of a control method for a refrigeration and heating system in an embodiment of the present invention.

[0021] Explanation of reference numerals in the accompanying drawings: 1. Rectifier plate; 11. Flow channel assembly; 21. First circulation branch; 211. Second regulating valve; 212. Liquid storage unit; 22. Second circulation branch; 221. Ejector device; 222. Water pump; 23. Third circulation branch; 231. Third regulating valve; 232. Third heat exchanger; 233. Connecting pipe; 24. Fourth circulation branch; 241. Fourth heat exchanger; 25. Fifth circulation branch; 251. Gas-liquid separator; 31. First temperature control branch; 311. Four-way reversing valve; 312. Compressor; 32. Second temperature control branch; 321. First heat exchanger; 322. First regulating valve; 323. Second heat exchanger; 324. One-way valve assembly; 325. Second expansion valve; 33. Third temperature control branch; 34. Fourth temperature control branch; 341. Third expansion valve; 35. Bypass branch; 351. First expansion valve. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0023] Example 1: This example describes a refrigeration and heating system.

[0024] The cooling and heating system in this embodiment is used to regulate the temperature of the rectifier plate 1.

[0025] When applying, refer to Figure 2 The rectifier plate 1 includes multiple sets of parallel flow channel groups 11.

[0026] In practical applications, each flow channel group 11 includes at least one flow channel. Furthermore, the flow channel resistance of different flow channel groups 11 is different, while the flow channels of the same flow channel group 11 have the same flow channel resistance.

[0027] The refrigeration and heating system of this embodiment includes a temperature control circuit and a circulation circuit connected by heat exchange.

[0028] In application, an ejector device 221 is provided on the circulation loop. The return gas side of the ejector device 221 is connected to the outlet side of the rectifier plate 1. The output side of the ejector device 221 is provided with a multi-way connecting pipe 233. Each connecting pipe 233 is connected to a group of flow channels 11 on the inlet side of the rectifier plate 1. Each connecting pipe 233 is provided with a first valve, which is used to adjust the flow rate of the circulating medium in the connecting pipe 233.

[0029] In practical applications, the ejector device 221 can be an ejector pump. When the cooling and heating system is used for cooling the rectifier plate 1, the ejector device 221 serves as the power source for the circulation loop, maintaining the flow of the circulating medium. When the cooling and heating system is used for heating the rectifier plate 1, the ejector device 221 creates a negative pressure at the outlet side of the rectifier plate 1, causing the circulating medium to vaporize within the rectifier plate 1 to form a gas-liquid two-phase flow, thereby utilizing the latent heat of phase change to improve heat transfer efficiency.

[0030] In actual implementation, the temperature control circuit stores refrigerant for heat exchange with the circulating medium in the circulation circuit.

[0031] refer to Figure 1 In this embodiment, the loop sequentially includes a first loop branch 21, a second loop branch 22, a third loop branch 23, and a fourth loop branch 24. Furthermore, the loop also includes a fifth loop branch 25.

[0032] The first end of the first circulation branch 21 is connected to the liquid storage unit 212. Further, the first end of the first circulation branch 21 is connected to the bottom of the liquid storage unit 212, which stores the circulating medium. The liquid storage unit 212 is equipped with at least two temperature sensors: one to detect the temperature at the top of the liquid storage unit 212 and the other to detect the temperature at the bottom of the liquid storage unit 212. In addition, the first circulation branch 21 is equipped with a second regulating valve 211. By adjusting the opening of the second regulating valve 211, the flow rate of the circulating medium in the first circulation branch 21 is adjusted.

[0033] The first end of the second circulation branch 22 is connected to the second end of the first circulation branch 21. The second circulation branch 22 is equipped with a water pump 222 and an ejector device 221, with the ejector device 221 located on the outlet side of the water pump 222. Furthermore, the ejector device 221 works in conjunction with the water pump 222 to maintain the flow of the circulating medium.

[0034] The first end of the third circulation branch 23 is connected to the output side of the ejector device 221. A third regulating valve 231 is provided on the third circulation branch 23, and the flow rate of the circulating medium within the third circulation branch 23 is adjusted by regulating the opening degree of the third regulating valve 231. The second end of the third circulation branch 23 is connected to the first heat exchange channel of the third heat exchanger 232, which is connected to a temperature control circuit to achieve heat exchange between the third circulation branch 23 and the temperature control circuit. After the second end of the third circulation branch 23 is connected to the first heat exchange channel of the third heat exchanger 232, it is connected to the inlet side of the rectifier plate 1. Furthermore, after the second end of the third circulation branch 23 is connected to the first heat exchange channel of the third heat exchanger 232, it is connected to multiple connecting pipes 233, each connecting pipe 233 connecting to a set of flow channel groups 11 on the inlet side of the rectifier plate 1.

[0035] The first end of the fourth circulation branch 24 is connected to the outlet side of the rectifier plate 1. The fourth circulation branch 24 is connected to the first heat exchange channel of the fourth heat exchanger 241, and the second heat exchange channel of the fourth heat exchanger 241 is connected to the temperature control circuit to realize heat exchange between the fourth circulation branch 24 and the temperature control circuit. The second end of the fourth circulation branch 24 is connected to the return gas side of the ejector device 221.

[0036] The first end of the fifth circulation branch 25 is connected to the upper part of the gas-liquid separator 251, the bottom of the gas-liquid separator 251 is connected to the first end of the second circulation branch 22, and the top of the gas-liquid separator 251 is connected to the liquid storage unit 212. Further, the top of the gas-liquid separator 251 is connected to the upper part or top of the liquid storage unit 212. The second end of the fifth circulation branch 25 is connected to the first end of the third circulation branch 23.

[0037] The temperature control circuit of this embodiment includes: a first temperature control branch 31, a second temperature control branch 32, and a third temperature control branch 33. Further, the temperature control circuit of this embodiment also includes: a fourth temperature control branch 34. Even further, the temperature control circuit of this embodiment also includes: a bypass branch 35.

[0038] The first end of the first temperature control branch 31 is connected to the S end of the four-way reversing valve 311; a compressor 312 is provided on the first temperature control branch 31, and the compressor 312 can be a refrigeration compressor; the second end of the first temperature control branch 31 is connected to the D end of the four-way reversing valve 311. Further, when the refrigeration and heating system is used for cooling the rectifier plate 1, the rectifier plate 1 participates in the process mode. At this time, the D end and E end of the four-way reversing valve 311 are connected, and the S end and C end are connected. When the refrigeration and heating system is used for heating the rectifier plate 1, the rectifier plate 1 participates in the cleaning mode. At this time, the D end and C end of the four-way reversing valve 311 are connected, and the E end and S end are connected.

[0039] The first end of the second temperature control branch 32 is connected to the E end of the four-way reversing valve 311. The second temperature control branch 32 is connected to the first heat exchange channel of the second heat exchanger 323, which is on the air side. Forced convection by a fan is used to achieve heat exchange of the refrigerant within the second temperature control branch 32. A first regulating valve 322 is provided on the second temperature control branch 32. The first regulating valve 322 is connected in parallel with the first heat exchange channel of the first heat exchanger 321, and the second heat exchange channel of the first heat exchanger 321 is connected to the liquid storage unit 212 to achieve heat exchange between the refrigerant and the circulating medium. Furthermore, when the first regulating valve 322 is closed, the refrigerant passing through the second heat exchanger 323 flows through the first heat exchanger 321 and exchanges heat with the circulating medium in the liquid storage unit 212; when the first regulating valve 322 is open, the refrigerant passing through the second heat exchanger 323 flows through the first regulating valve 322 and does not flow through the first heat exchanger 321. Furthermore, the second end of the second temperature control branch 32 is connected to the first side of the one-way valve assembly 324. The one-way valve assembly 324 includes a one-way valve and a second expansion valve 325 connected in series.

[0040] The first end of the third temperature control branch 33 is connected to the second side of the one-way valve assembly 324. The third temperature control branch 33 is connected to the second heat exchange channel of the third heat exchanger 232 to achieve heat exchange between the third temperature control branch 33 and the third circulation branch 23. The second end of the third temperature control branch 33 is connected to the C end of the four-way reversing valve 311 to facilitate the refrigerant entering the input end of the compressor 312, thereby realizing the recycling of the refrigerant.

[0041] The first end of the fourth temperature-controlled branch 34 merges with the first end of the third temperature-controlled branch 33, and together they connect to the second side of the one-way valve assembly 324. A third expansion valve 341 is provided on the fourth temperature-controlled branch 34; the second end of the fourth temperature-controlled branch 34 connects to the second heat exchange channel of the fourth heat exchanger 241 to achieve heat exchange between the fourth circulation branch 24 and the fourth temperature-controlled branch 34. After the second end of the fourth temperature-controlled branch 34 is connected to the second heat exchange channel of the fourth heat exchanger 241, it merges with the first end of the second temperature-controlled branch 32, and together they connect to the E end of the four-way reversing valve 311.

[0042] After the first end of the bypass branch 35 merges with the first end of the third temperature control branch 33, they are connected together to the second side of the one-way valve assembly 324. A first expansion valve 351 is provided on the bypass branch 35. After the second end of the bypass branch 35 merges with the first end of the second temperature control branch 32, they are connected together to the E end of the four-way reversing valve 311.

[0043] In summary, this embodiment utilizes compressor 312 to drive refrigerant circulation for heating. Compared to traditional electric heating methods, the coefficient of performance (COP) of compressor 312 for heating is typically 3 to 4 times that of electric heating, significantly reducing system power consumption, energy consumption, and long-term operating costs. In the heating mode cleaning operation, this embodiment uses ejector device 221 to create a negative pressure at the outlet side of rectifier plate 1, causing the circulating medium to vaporize within rectifier plate 1, forming a gas-liquid two-phase flow. This utilizes the latent heat of phase change to release more heat, and the phase change process is accompanied by boiling heat transfer, resulting in a heat transfer efficiency typically 5 to 10 times that of pure liquid heat transfer, enabling rapid heating of rectifier plate 1. This embodiment utilizes the heat and cold storage capacity of liquid storage unit 212 to store high-temperature circulating medium in heating mode and low-temperature circulating medium in cooling mode. When switching between heating and cooling modes is required, the circulating medium in liquid storage unit 212 can immediately participate in the circulation, significantly reducing the waiting time for heating or cooling and increasing the effective operating time of the vapor deposition equipment. In this embodiment, the rectifier plate 1 is divided into multiple flow channel groups 11 according to the flow channel resistance characteristics, and an independent first valve is set for each group. By adjusting the opening of the first valve, the uneven flow distribution caused by manufacturing tolerances and position effects can be compensated, so that the total resistance of each flow channel group 11 tends to be consistent, achieving flow balance, thereby making the surface temperature distribution of the rectifier plate 1 uniform, improving process stability and cleaning effect.

[0044] Example 2: This example introduces a control method for a refrigeration and heating system based on Example 1.

[0045] refer to Figure 3 The control method of the refrigeration and heating system in this embodiment includes steps SS1 and SS2.

[0046] Step SS1: Before starting the refrigeration and heating system: Set the initial opening degree of the corresponding first valve according to the flow resistance of each flow channel group 11.

[0047] In application, the greater the flow resistance of flow channel group 11, the greater the absolute value of the deviation between the actual temperature and the target temperature; the smaller the flow resistance of flow channel group 11, the smaller the deviation between the actual temperature and the target temperature. Since the flow resistance of different flow channel groups 11 is different, the deviation between the actual temperature and the target temperature of different flow channel groups 11 is different. Therefore, by adjusting the initial opening of the first valve to compensate for the resistance difference, the total resistance of each flow channel group 11 is made closer to the same, thereby achieving flow balance and thus making the actual temperature of different flow channel groups 11 closer to the same.

[0048] In practical applications, the method for setting the initial opening degree of the first valve in step SS1 includes steps SS11 to SS14.

[0049] Step SS11: Supply water to the rectifier plate 1 at a preset pressure, and measure the flow rate of each flow channel group 11 and the pressure difference between the inlet and outlet sides of each flow channel group 11.

[0050] In application, water is supplied to the rectifier plate 1 at a preset pressure, and all first valves are fully opened to measure the flow rate of each flow channel group 11 and the pressure difference between the inlet and outlet sides of each flow channel group 11.

[0051] In practical applications, the preset pressure is determined based on the working pressure of the rectifier plate 1, and can be from 0.2MPa to 0.5MPa. Furthermore, when the pressure on the inlet side of the rectifier plate 1 is the preset pressure and is maintained for 30 to 60 seconds, the flow rate of each flow channel group 11 is measured.

[0052] Step SS12: Determine the flow resistance of each flow channel group 11 based on the pressure difference between the inlet and outlet sides of the flow channel group 11 and the flow rate of the flow channel group 11.

[0053] In application, the ratio of the pressure difference between the inlet and outlet sides of the flow channel group 11 to the square of the flow rate of the flow channel group 11 is determined as the flow channel resistance.

[0054] Step SS13: Determine the resistance coefficient of each flow channel group 11 based on the maximum flow channel resistance, the minimum flow channel resistance, and the flow channel resistance of the current flow channel group 11.

[0055] When applied, the drag coefficient includes: In the formula, This is the number for flow channel group 11; For the first The resistance coefficient of the flow channel group; The maximum flow channel resistance is specifically the maximum flow channel resistance obtained in step SS12. The minimum flow channel resistance is specifically the minimum flow channel resistance obtained in step SS12, and ; For the first The flow resistance of the flow channel group.

[0056] Step SS14: Determine the initial opening of each first valve based on the preset basic opening, the opening adjustment range, and the resistance coefficient.

[0057] In application, the preset base opening is determined based on the valve's flow characteristic curve and the system design conditions. Furthermore, the preset base opening can be 30% to 50% of the first valve's full opening to ensure the valve operates within a stable linear range of flow gain and to allow for sufficient adjustment margin. The opening adjustment range = 1 - preset base opening.

[0058] In practical applications, the initial opening includes: In the formula, The numbering of the flow channel group; For the first The initial opening of the flow channel group; To preset the basic opening; For the first The resistance coefficient of the flow channel group; This refers to the opening adjustment range.

[0059] Step SS2: After the cooling and heating system is started: obtain the actual temperature of each flow channel group 11, and adjust the opening of the corresponding first valve according to the deviation between the actual temperature and the target temperature so that the actual temperature of each flow channel group 11 approaches the target temperature.

[0060] In application, when the cooling and heating system is used for cooling the rectifier plate 1 and the rectifier plate 1 participates in the process mode, the target temperature is set according to the process requirements, for example, the target temperature is 3°C to 7°C, preferably 5°C. When the cooling and heating system is used for heating the rectifier plate 1 and the rectifier plate 1 participates in the cleaning mode, the target temperature is set according to the process requirements, for example, the target temperature is 55°C to 65°C, preferably 60°C.

[0061] In practical applications, based on the current operating mode of the refrigeration and heating system, such as heating mode or cooling mode, the heat exchange state of the flow channel group 11 is determined according to the deviation between the actual temperature and the target temperature, such as insufficient heat exchange or excessive heat exchange. Furthermore, the opening degree of the first valve is adjusted according to the deviation between the actual temperature and the target temperature and the heat exchange state, so that the actual temperature of each flow channel group 11 approaches the target temperature. For example, when the heat exchange is insufficient, the opening degree of the first valve is increased; when the heat exchange is excessive, the opening degree of the first valve is decreased.

[0062] In actual implementation, when the current operating mode of the refrigeration / heating system is heating mode, the method for adjusting the opening of the first valve in step SS2 includes: when When this occurs, it indicates that the heat transfer state of the constant flow channel group is too high, causing... ;when When this occurs, it indicates that the heat transfer state of the constant flow channel group is too high, causing... ;when When this occurs, it indicates that the heat exchange state of the constant flow channel group is insufficient, so let ;when When this occurs, it indicates that the heat exchange state of the constant flow channel group is insufficient, so let ;when season In the formula, The numbering of the flow channel group; For the first The deviation between the actual temperature and the target temperature of the flow channel group; This is the maximum permissible deviation threshold for the current operating condition of rectifier board 1, and ; This is the minimum permissible deviation threshold for the current operating condition of the rectifier board, and ; For the first The opening degree of the first valve corresponding to the flow channel group; For coarse adjustment of step size; To fine-tune the step size, and Furthermore, Determined based on valve flow characteristics; Determined based on control accuracy requirements. Specifically, It can be 5% to 8% of the full opening of the first valve; It can be 1% to 2% of the full opening of the first valve.

[0063] In actual implementation, when the current operating mode of the refrigeration / heating system is refrigeration mode, the method for adjusting the opening of the first valve in step SS2 includes: when When this occurs, it indicates that the heat exchange state of the constant flow channel group is insufficient, so let ;when When this occurs, it indicates that the heat exchange state of the constant flow channel group is insufficient, so let ;when When this occurs, it indicates that the heat transfer state of the constant flow channel group is too high, causing... ;when When this occurs, it indicates that the heat transfer state of the constant flow channel group is too high, causing... ;when season In the formula, The numbering of the flow channel group; For the first The deviation between the actual temperature and the target temperature of the flow channel group; This is the maximum permissible deviation threshold for the rectifier board under its current operating conditions, and ; This is the minimum permissible deviation threshold for the current operating condition of the rectifier board, and ; For the first The opening degree of the first valve corresponding to the flow channel group; For coarse adjustment of step size; To fine-tune the step size, and .

[0064] Determined according to process requirements. Determined based on sensor accuracy. When the current operating mode of the cooling / heating system is heating mode: It can be 3℃ to 5℃; The temperature can range from 0.5℃ to 1℃; when the current operating mode of the cooling / heating system is cooling mode: The temperature can range from 1℃ to 3℃; The temperature can range from 0.3℃ to 0.8℃.

[0065] In summary, this embodiment sets the initial opening of the first valve based on the measured flow resistance of each flow channel group 11 before system startup to achieve pre-compensation, enabling the system to quickly enter a near-ideal working state and reducing the number of debugging iterations. After system startup, the opening of the first valve is dynamically adjusted based on the deviation between the actual temperature and the target temperature of each flow channel group 11 to compensate for pre-compensation errors and changes in operating conditions during operation, achieving precise compensation for flow resistance and ensuring that the actual temperature of each flow channel group 11 accurately approaches the target temperature. This embodiment employs a graded adjustment method combining coarse and fine adjustments. When the temperature deviation is large, a large step size coarse adjustment is used to quickly approach the target; when the temperature deviation is small, a small step size fine adjustment is used to avoid overshoot and oscillation, balancing adjustment speed and accuracy, and enabling the system to stabilize quickly.

[0066] Example 3: Based on Example 1 or Example 2, this example introduces a control method for a refrigeration and heating system.

[0067] When the cooling and heating system is used to cool the rectifier plate 1, the control method includes: executing steps SS311 to SS314 in the temperature control loop, and executing steps SS321 to SS322 in the circulation loop.

[0068] Step SS311: Connect the D end and E end of the four-way directional valve 311, connect the S end and C end, and close the third expansion valve 341.

[0069] Step SS312: Turn off the fan of the second heat exchanger 323 and close the first regulating valve 322.

[0070] Step SS313: Start the compressor 312 to allow the refrigerant to exchange heat with the circulating medium stored in the liquid receiver 212 through the first heat exchanger 321.

[0071] In application, the refrigerant is compressed by the compressor 312 and enters the D end of the four-way reversing valve 311. After flowing out from the E end, it enters the second heat exchanger 323. At this time, the fan of the second heat exchanger 323 and the first regulating valve 322 are both in the closed state. The high-temperature refrigerant enters the first heat exchanger 321 and exchanges heat with the circulating medium in the storage unit to heat the circulating medium in the liquid storage unit 212.

[0072] Step SS314: When the temperature of the circulating medium in the liquid storage unit 212 rises to the first preset temperature, the fan of the second heat exchanger 323 and the first regulating valve 322 are turned on, so that the refrigerant flows through the one-way valve assembly 324 and the third heat exchanger 232 in sequence, and after cooling the circulating medium, it enters the C end of the four-way reversing valve 311.

[0073] In application, the circulating medium is cooled to 5°C through the third heat exchanger 232.

[0074] In practical applications, the refrigerant enters the S terminal through the C terminal of the four-way reversing valve 311, and then flows into the input terminal of the compressor 312 through the S terminal.

[0075] In actual implementation, the first preset temperature is 50℃. Raising the temperature of the circulating medium in the liquid storage unit 212 to the first preset temperature serves two purposes: firstly, to store heat in the liquid storage unit 212 so as to quickly provide a high-temperature circulating medium when switching to the cleaning mode, thus shortening the waiting time for heating; secondly, to provide a stable heat load for the compressor 312 at the initial stage of system startup, avoiding the compressor 312 from being unloaded or overheating, and achieving a smooth transition of heat load.

[0076] In some embodiments, the opening of the second expansion valve 325 is adjusted according to the deviation between the inlet temperature of the rectifier plate 1 and the first preset temperature: when the deviation between the inlet temperature of the rectifier plate 1 and the first preset temperature is greater than 0, the opening of the second expansion valve 325 is increased; when the deviation between the inlet temperature of the rectifier plate 1 and the first preset temperature is less than 0, the opening of the second expansion valve 325 is decreased.

[0077] In some further embodiments, the opening of the first expansion valve 351 is adjusted inversely according to the opening of the second expansion valve 325 to regulate the flow rate of the high-temperature refrigerant in the bypass branch 35 into the third heat exchanger 232, so that the inlet side temperature of the rectifier plate 1 approaches the first preset temperature.

[0078] Step SS321: Close the second regulating valve 211 and start the water pump 222 to provide a power source for the ejector device 221.

[0079] Step SS322: The ejector device 221 ejects the circulating medium from the fourth heat exchanger 241. The circulating medium is divided into two paths at the output side of the ejector device 221: one path enters the gas-liquid separator 251 and then re-enters the water pump 222; the other path enters the third heat exchanger 232 for heat exchange and cooling, and then enters the rectifier plate 1 to absorb the heat from the rectifier plate 1. The circulating medium flowing through the rectifier plate 1 returns to the ejector device 221 through the fourth heat exchanger 241.

[0080] When the cooling and heating system is used to heat the rectifier plate 1, the control method further includes: executing steps SS411 to SS412 in the temperature control loop and executing steps SS421 to SS422 in the circulation loop.

[0081] Step SS421: When the temperature of the circulating medium in the storage unit 212 is lower than the first preset temperature, close the second regulating valve 211; when the temperature of the circulating medium in the storage unit 212 is greater than or equal to the first preset temperature, open the second regulating valve 211 to allow the circulating medium stored in the storage unit 212 to participate in the circulation.

[0082] Step SS422: Start water pump 222 to provide power to ejector device 221. After being pressurized by water pump 222, the circulating medium enters ejector device 221 and flows out of ejector device 221 and enters third heat exchanger 232 through third regulating valve 231.

[0083] In application, the circulating medium is heated to the target temperature of 60°C in the third heat exchanger 232 before entering the rectifier plate 1.

[0084] In practical applications, the ejector device 221 maintains a negative pressure at the outlet side of the rectifier plate 1. Furthermore, the relationship between the pressure at the outlet side of the rectifier plate 1 and the return gas temperature at the outlet side of the rectifier plate 1 includes: P(T) = A × T 4 -B×T 3 +C×T 2 -D×T+E, where P(T) is the pressure, T is the boiling point temperature, and A, B, C, D, and E are fitting coefficients. For example, when the circulating medium is water, A=0.0000012136, B=0.0001043992, C=0.0108137083, D=0.2908714719, and E=5.3000714286.

[0085] Under negative pressure, the circulating medium partially vaporizes inside the rectifier plate 1 to form a gas-liquid two-phase flow, releasing heat to the rectifier plate 1 and raising its temperature. The gas-liquid two-phase fluid after heat exchange is cooled and condensed into a liquid state through the fourth heat exchanger 241 and returns to the ejector device 221 to complete the cycle.

[0086] Step SS411: Connect the D end and C end of the four-way directional valve 311, and connect the E end and S end.

[0087] Step SS412: Start the compressor 312 to allow the refrigerant to exchange heat with the circulating medium through the third heat exchanger 232. The refrigerant after passing through the third heat exchanger 232 flows in two paths: one path flows through the third expansion valve 341 and the fourth heat exchanger 241 in sequence to exchange heat with and cool the circulating medium before entering the E end of the four-way reversing valve 311; the other path flows through the one-way valve assembly 324 and the second circulation branch 22 in sequence to regulate the temperature of the circulating medium in the liquid receiver unit 212.

[0088] In application, when the temperature of the circulating medium in the liquid storage unit 212 is less than or equal to the first preset temperature, the first regulator is turned on and the fan of the second heat exchanger 323 is turned off, so that the refrigerant after flowing through the one-way valve assembly 324 flows through the second heat exchanger 323 and absorbs heat from the air before entering the E end of the four-way reversing valve 311. When the temperature of the circulating medium in the liquid storage unit 212 is greater than the first preset temperature, the first regulator is turned off and the fan of the second heat exchanger 323 is turned on, so that the refrigerant after flowing through the one-way valve assembly 324 flows through the first heat exchanger 321 to cool the circulating medium before passing through the second heat exchanger 323 and entering the E end of the four-way reversing valve 311.

[0089] When the cooling and heating system needs to switch from heating mode to cooling mode, the control method further includes: executing step SS511 in the temperature control loop and executing step SS521 in the circulation loop.

[0090] Step SS511: When the temperature of the circulating medium in the liquid storage unit 212 is lower than the second preset temperature, open the first regulator and close the fan of the second heat exchanger 323, so that the refrigerant flows through the second heat exchanger 323 and absorbs heat from the air before entering the E end of the four-way reversing valve 311; when the temperature of the circulating medium in the liquid storage unit 212 is greater than or equal to the second preset temperature, close the first regulator and open the fan of the second heat exchanger 323, so that the refrigerant flows through the first heat exchanger 321 to cool the circulating medium before entering the E end of the four-way reversing valve 311.

[0091] When applying, the second preset temperature is 20℃.

[0092] In practical applications, when the temperature of the circulating medium in the liquid storage unit 212 is lower than the second preset temperature, the first regulator is turned on and the fan of the second heat exchanger 323 is turned off. This allows the refrigerant, after flowing through the one-way valve assembly 324, to flow through the second heat exchanger 323 and absorb heat from the air before entering the E terminal of the four-way reversing valve 311. When the temperature of the circulating medium in the liquid storage unit 212 is greater than or equal to the second preset temperature, the first regulator is turned off and the fan of the second heat exchanger 323 is turned on. This allows the refrigerant, after flowing through the one-way valve assembly 324, to flow through the first heat exchanger 321 to cool the circulating medium before passing through the second heat exchanger 323 and entering the E terminal of the four-way reversing valve 311.

[0093] Step SS521: When the temperature of the circulating medium in the liquid storage unit 212 is lower than the third preset temperature, open the second regulating valve 211 to allow the circulating medium stored in the liquid storage unit 212 to participate in the circulation; when the temperature of the circulating medium in the liquid storage unit 212 is greater than or equal to the third preset temperature, close the second regulating valve 211.

[0094] When applying, the third preset temperature is 30℃.

[0095] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A refrigeration and heating system, characterized by, Used to regulate the temperature of the rectifier plate, the rectifier plate includes multiple sets of parallel flow channels, and the flow channel resistance of different sets of flow channels is different; The refrigeration and heating system includes: a temperature control circuit and a circulation circuit connected by heat exchange; The circulation loop is equipped with an ejector device. The return gas side of the ejector device is connected to the outlet side of the rectifier plate. The output side of the ejector device is equipped with multiple connecting pipes. Each connecting pipe is connected to a group of flow channels on the inlet side of the rectifier plate. Each connecting pipe is equipped with a first valve. The first valve is used to adjust the flow rate of the circulating medium in the connecting pipe so that the actual temperature of each flow channel group is close to the target temperature. After the refrigeration and heating system is started: the actual temperature of each flow channel group is obtained, and the opening degree of the corresponding first valve is adjusted according to the deviation between the actual temperature and the target temperature so that the actual temperature of each flow channel group is close to the target temperature. When the cooling and heating system is used to heat the rectifier plate, the circulation loop is provided sequentially as follows: A first circulation branch, the first end of which is connected to the liquid storage unit; a second regulating valve is provided on the first circulation branch; The second circulation branch is equipped with a water pump; the ejector device is located on the outlet side of the water pump. The third circulation branch has a first end connected to the output side of the ejector device; a third regulating valve is provided on the third circulation branch; and the second end of the third circulation branch is connected to the first heat exchange channel of the third heat exchanger and then connected to the inlet side of the rectifier plate. The fourth circulation branch has its first end connected to the outlet side of the rectifier plate; the fourth circulation branch is connected to the first heat exchange channel of the fourth heat exchanger; and the second end of the fourth circulation branch is connected to the return gas side of the ejector device. When the cooling and heating system is used for cooling the rectifier plate, the circulation loop further includes: a fifth circulation branch; the first end of the fifth circulation branch is connected to the upper part of the gas-liquid separator, the top of the gas-liquid separator is connected to the liquid storage unit, and the bottom of the gas-liquid separator is connected to the first end of the second circulation branch; the second end of the fifth circulation branch is connected to the first end of the third circulation branch.

2. The refrigeration and heating system according to claim 1, wherein When the cooling and heating system is used for cooling the rectifier plate, the temperature control circuit includes: The first temperature control branch has a first end connected to the S end of a four-way reversing valve; a compressor is installed on the first temperature control branch; and the second end of the first temperature control branch is connected to the D end of the four-way reversing valve. The second temperature control branch has its first end connected to the E end of the four-way reversing valve and its second end connected to the first heat exchange channel of the second heat exchanger. A first regulating valve is provided on the second temperature control branch, and the first regulating valve is connected in parallel with the first heat exchange channel of the first heat exchanger. The second heat exchange channel of the first heat exchanger is connected to the liquid storage unit. The second end of the second temperature control branch is connected to the first side of the one-way valve assembly. The one-way valve assembly includes a one-way valve and a second expansion valve connected in series. The third temperature control branch has its first end connected to the second side of the one-way valve assembly, the third temperature control branch connected to the second heat exchange channel of the third heat exchanger, and the second end of the third temperature control branch connected to the C end of the four-way reversing valve. When the cooling and heating system is used for heating the rectifier plate, the temperature control circuit further includes: a fourth temperature control branch; the first end of the fourth temperature control branch merges with the first end of the third temperature control branch and is connected to the second side of the one-way valve assembly; a third expansion valve is provided on the fourth temperature control branch; the second end of the fourth temperature control branch is connected to the second heat exchange channel of the fourth heat exchanger, merges with the first end of the second temperature control branch, and is connected to the E end of the four-way reversing valve.

3. The refrigeration and heating system according to claim 2, characterized in that, The temperature control circuit also includes: a bypass branch; After the first end of the bypass branch and the first end of the third temperature control branch merge, they are connected together to the second side of the one-way valve assembly; A first expansion valve is provided on the bypass branch; The second end of the bypass branch merges with the first end of the second temperature control branch and is then connected to the E end of the four-way reversing valve.

4. A control method for a refrigeration and heating system as described in any one of claims 1 to 3, characterized in that, include: Before the refrigeration and heating system is started: the initial opening degree of the corresponding first valve is set according to the flow resistance of each flow channel group; After the cooling and heating system is started: the actual temperature of each flow channel group is obtained, and the opening degree of the corresponding first valve is adjusted according to the deviation between the actual temperature and the target temperature so that the actual temperature of each flow channel group approaches the target temperature.

5. The control method for the refrigeration and heating system according to claim 4, characterized in that, The method for setting the initial opening degree of the first valve includes: Water is supplied to the rectifier plate at a preset pressure, and the flow rate of each flow channel group and the pressure difference between the inlet and outlet sides of each flow channel group are measured. The flow resistance of each flow channel group is determined based on the pressure difference between the inlet and outlet sides of the flow channel group and the flow rate of the flow channel group. The resistance coefficient of each flow channel group is determined based on the maximum flow channel resistance, the minimum flow channel resistance, and the flow channel resistance of the current flow channel group. The initial opening of each first valve is determined based on the preset basic opening, the opening adjustment range, and the resistance coefficient.

6. The control method for the refrigeration and heating system according to claim 4, characterized in that, The method for adjusting the opening degree of the first valve includes: Based on the current operating mode of the cooling and heating system, the heat exchange state of the flow channel group is determined according to the deviation between the actual temperature and the target temperature; wherein, the operating mode is heating mode or cooling mode; and the heat exchange state is insufficient heat exchange or excessive heat exchange. The opening of the first valve is adjusted according to the deviation between the actual temperature and the target temperature and the heat exchange status, so that the actual temperature of each flow channel group is close to the target temperature: when the heat exchange is insufficient, the opening of the first valve is increased; when the heat exchange is excessive, the opening of the first valve is decreased.

7. The control method for the refrigeration and heating system according to claim 4, characterized in that, When the cooling and heating system is used for cooling the rectifier plate, the control method further includes: In the temperature control circuit: Connect the D end of the four-way directional valve to the E end, connect the S end to the C end, and close the third expansion valve; Turn off the fan of the second heat exchanger and close the first regulating valve; Start the compressor to allow the refrigerant to exchange heat with the circulating medium stored in the liquid receiver unit through the first heat exchanger; When the temperature of the circulating medium in the liquid storage unit rises to the first preset temperature, the fan of the second heat exchanger and the first regulating valve are turned on, so that the refrigerant flows through the one-way valve assembly and the third heat exchanger in sequence, and after cooling the circulating medium, it enters the C end of the four-way reversing valve. In a loop: Close the second regulating valve and start the water pump to provide power to the ejector device; The ejector device ejects circulating medium from the fourth heat exchanger, and the circulating medium is split into two paths at the output side of the ejector device: One circulating medium enters the gas-liquid separator, and after passing through the gas-liquid separator, it re-enters the water pump; Another circulating medium enters the third heat exchanger for heat exchange and cooling, and then enters the rectifier plate to absorb the heat from the rectifier plate. The circulating medium flowing through the rectifier plate returns to the ejector device through the fourth heat exchanger.

8. The control method for the refrigeration and heating system according to claim 4, characterized in that, When the cooling and heating system is used for heating the rectifier plate, the control method further includes: In a loop: When the temperature of the circulating medium in the liquid storage unit is greater than or equal to the first preset temperature, the second regulating valve is opened to allow the circulating medium stored in the liquid storage unit to participate in the circulation. When the temperature of the circulating medium in the liquid storage unit is lower than the first preset temperature, the second regulating valve is closed. In the temperature control circuit: Connect the D end of the four-way directional valve to the C end, and connect the E end to the S end; Start the compressor to allow the refrigerant to exchange heat with the circulating medium through the third heat exchanger. The refrigerant after passing through the third heat exchanger flows in two paths: One stream of refrigerant flows sequentially through the third expansion valve and the fourth heat exchanger, where it cools down the circulating medium before entering the E end of the four-way reversing valve. Another refrigerant flows sequentially through the one-way valve assembly and the second circulation branch to regulate the temperature of the circulating medium in the liquid receiver unit.

9. The control method for the refrigeration and heating system according to claim 4, characterized in that, When the cooling / heating system needs to switch from heating mode to cooling mode, the control method further includes: In the temperature control circuit: When the temperature of the circulating medium in the liquid storage unit is lower than the second preset temperature, the first regulator is turned on and the fan of the second heat exchanger is turned off, so that the refrigerant flows through the second heat exchanger and absorbs heat from the air before entering the E end of the four-way reversing valve. When the temperature of the circulating medium in the liquid storage unit is greater than or equal to the second preset temperature, the first regulator is turned off and the fan of the second heat exchanger is turned on, so that the refrigerant flows through the first heat exchanger to cool the circulating medium and then enters the E end of the four-way reversing valve. In a loop: When the temperature of the circulating medium in the storage unit is lower than the third preset temperature, the second regulating valve is opened to allow the circulating medium stored in the storage unit to participate in the circulation. When the temperature of the circulating medium in the liquid storage unit is greater than or equal to the third preset temperature, the second regulating valve is closed.

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