Automatic constant-pressure temperature control system and temperature control method thereof

Abstract

The invention discloses an automatic constant-pressure temperature control system and a temperature control method thereof. The automatic constant-pressure temperature control system comprises a storage tank, a heating assembly and a constant-pressure temperature and switching assembly. A circulating medium and a cooler used for cooling the circulating medium are stored in the storage tank. The heating assembly is composed of a switching valve, a circulating pump and a heater, and a controllable on-off loop of a circulating medium is formed. The constant pressure and temperature assembly adjusts the flow of the system through switching of the first pipeline and the second pipeline, and switching of constant pressure and temperature is achieved. Compared with the prior art, stable operation is ensured by accurately controlling the pressure and temperature of the system. And the earlier-stage design period in the inflation mode is over the third time, so that the efficiency is improved. The flow is intelligently adjusted in a constant-temperature mode, it is ensured that the temperature difference is stable, even under the working condition of large flow, the system can still accurately control the temperature, the quick response capacity is provided through the optimized heating design, and quick replacement and assembly replacement are achieved.

Description

Technical Field

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

[0002] Temperature control systems play a vital role in modern industry, laboratory research, and precision manufacturing. They are widely used in chemical, food processing, pharmaceutical, semiconductor manufacturing and other fields, requiring precise temperature control to ensure product quality, production efficiency and safety. As the requirements for temperature control in these industries continue to increase, the existing temperature control systems have exposed obvious deficiencies in meeting the temperature adjustment needs of multiple scenarios. Existing temperature control systems are usually composed of temperature sensors, heaters, cooling devices, controllers, etc., which monitor the temperature inside the system in real time through temperature sensing elements and adjust the temperature through feedback adjustment mechanisms. However, these systems often have the following technical defects in actual applications: 1. Slow response speed and untimely temperature switching. Traditional temperature control systems show obvious lag when facing the need for rapid temperature switching, especially in scenarios where the temperature difference increases or the temperature needs to be adjusted at intervals. The system is difficult to respond quickly, resulting in an increase in temperature during the temperature control process, which first affects production efficiency. Untimely temperature switching will directly affect product quality and even cause process failures; 2. Poor temperature control accuracy. The temperature performance of existing systems is limited. Although it can maintain a certain temperature, the temperature is prone to greater fluctuations when the external environment changes or the system load fluctuates. This situation is particularly obvious in production processes that require long-term temperature maintenance. It is impossible to ensure the high stability of the system temperature, which may cause excessive temperature differences, thereby affecting product performance or the accuracy of test results. Based on the above defects, the existing temperature control system needs to be optimized in terms of rapid response to temperature switching, temperature difference fluctuation control and regulation, etc. Summary of the invention

[0003] The present application proposes an automatic constant pressure temperature control system and a temperature control method thereof, aiming to solve the defects of the temperature control system in the prior art, such as unstable temperature difference control and a long time required for the heating process.

[0004] The technical solution adopted by the invention is an automatic constant pressure temperature control system, which includes: a storage tank, in which a circulating medium is stored, and a cooler for cooling the circulating medium is provided in the storage tank; a heating component, which includes a switch valve, a circulating pump and a heater connected in sequence, the switch valve is connected to the circulating medium outlet of the element to be heated, the heater is connected to the circulating medium inlet of the element to be heated, and the heating component is connected to the element to be heated to form a controllable on-off circuit of the circulating medium; a constant pressure and temperature switching component, which includes a first pipeline connecting the storage tank to the inlet of the circulating pump, a first regulating valve for adjusting the flow of the first pipeline, a second pipeline connecting the circulating medium outlet of the element to be heated and the storage tank, and a second regulating valve for adjusting the flow of the second pipeline.

[0005] Furthermore, the cooler includes a coil disposed inside the storage tank and a refrigerant circulation circuit connecting two ends of the coil.

[0006] Furthermore, the refrigerant circulation circuit includes a refrigerant input pipeline and a refrigerant output pipeline, and a pressure detection device, a ball valve, a filter, a third regulating valve, a ball valve, a temperature detection device and a first bypass are sequentially provided on the input end of the refrigerant input pipeline, one end of the first bypass is connected to the pressure detection device and the other end is connected to the temperature detection device, and a ball valve is also provided on the first bypass.

[0007] Furthermore, the storage tank is provided with a temperature detection device, a pressure relief pipe, a safety gas replenishing pipe, an oil replenishing pipe and a pressure detection device; the pressure relief pipe is connected to the upper end of the storage tank, the pressure relief pipe includes a control valve group composed of a number of regulating and switching valves, the safety gas replenishing pipe is connected to the upper end of the storage tank, the safety gas replenishing pipe includes a control valve group composed of a number of regulating and switching valves, and the oil replenishing pipe is provided with a switching valve.

[0008] Furthermore, the control valve groups on the pressure relief pipe and the safety gas replenishment pipe each include: a first stop valve and a solenoid valve and a second stop valve connected between the first stop valve and the storage tank, and the solenoid valve and the second stop valve are connected in parallel.

[0009] Furthermore, a temperature detection device, a pressure detection device and a ball valve are provided between the heater and the circulating medium inlet of the element to be heated; a temperature detection device, a pressure detection device and a ball valve are provided between the switch valve and the circulating medium outlet of the element to be heated; a filter is provided at the input end of the switch valve; between the switch valve and the circulating medium outlet of the heating element, the heating component also includes a second bypass connected between the output end of the heater and the input end of the circulating pump, and a ball valve is provided on the second bypass.

[0010] Furthermore, the first pipeline is also provided with a ball valve and a filter located on the input side of the first regulating valve, and a ball valve and a drain port located on the output side of the first regulating valve; the second pipeline is also provided with a ball valve.

[0011] A temperature control method for an automatic constant pressure temperature control system as described above, which operates in any one of the following ways (1) to (4): (1) adjusting the opening of the constant pressure and temperature switching component and maximizing the flow rate, and only closing the switch valve of the heating component to exhaust the heating element; (2) adjusting the flow rate of the constant pressure and temperature switching component to the minimum, and opening the heating component to heat and increase the temperature of the circulating medium; (3) controlling the heater to be closed, and adjusting the flow rate of the second pipeline and / or the first pipeline to control the temperature of the heating element to be heated to a preset temperature difference range; or controlling the heater to be opened, and closing the second pipeline to increase the temperature of the heating element to be heated to a preset temperature difference range; (4) adjusting the constant pressure and temperature switching component to be opened and maximizing the flow rate, and closing the switch valve of the heating component and the heater to cool the heating element.

[0012] Furthermore, in the method (1), the switch valve is opened before the exhaust is completed, so that a part of the circulating medium flowing out of the element to be heated is diverted through the switch valve to enter the heater to circulate and preheat the medium; after the exhaust time is over, the opening of the first regulating valve is reduced to the minimum to prevent a sudden increase in pressure during the heating process; the opening of the second regulating valve is reduced to the minimum, and the switch valve is maintained open to ensure that the circulating medium flowing out of the element to be heated is continuously heated by the heater.

[0013] Furthermore, the method (3) includes: when the actual temperature of the element to be heated exceeds the preset temperature difference range, the opening of the second regulating valve and the first regulating valve is first opened to a maximum of 100%, and after a delay of several seconds, the switch valve is closed, and the circulating medium is pumped out of the storage tank by the circulating pump, output to the element to be heated through the circulating pump for cooling, and then flows back to the storage tank for circulation;

[0014] When the actual temperature of the element to be heated does not exceed the preset temperature difference range, but exceeds the preset temperature value, the switch valve is opened, and the opening of the second regulating valve is adjusted to exceed the minimum opening, so as to divert a part of the medium passing through the element to be heated, cool it in the storage tank, and then continue to be output to the element to be heated by the circulation pump for cooling;

[0015] When the actual temperature of the element to be heated is equal to the preset temperature value, the opening of the second regulating valve is reduced to the minimum opening, and the minimum opening of the second regulating valve is greater than or equal to 0%; and the opening of the first regulating valve is also reduced to the minimum opening, and the minimum opening of the first regulating valve is not less than 20% to prevent the expansion of the medium during the heating process from causing high pressure in the system, and the switch valve is in the open state.

[0016] Compared with the prior art, the present invention can maintain constant pressure and temperature output under different working conditions through precise adjustment of the constant pressure and temperature switching component output and the heating component to ensure stable operation. The preheating design is carried out in the exhaust mode so that the circulating medium is partially heated before preheating, which greatly increases the time required for preheating and improves the overall efficiency. In the thermostatic valve mode, the system accurately controls the flow rate through intelligent adjustment to ensure that the temperature change is maintained within the preset range, ensure stable temperature difference control, and avoid overheating or overcooling. Even under high-flow operating conditions, the system can still accurately control the temperature through the regulating valve and the circulation component to meet the needs of high-load work. By optimizing the design of the heating component 3 and the circulation path, the system has a fast response capability and can quickly reach the set temperature to improve work efficiency. The automatic constant pressure temperature control system provided by the present invention has the functions of high-efficiency low temperature, precise constant temperature, rapid cooling and safe exhaust, which significantly improves the flexibility and safety of the temperature control process and is suitable for a wide range of industrial occasions with strict temperature requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0018] Figure 1 It is a schematic diagram of the connection structure of the temperature control system in the present invention.

[0019] The main figures in this application are:

[0020] 1. Storage tank; 12. Coil; 13. Refrigerant circulation circuit; 14. Refrigerant input pipeline; 15. Refrigerant output pipeline; 16. Third regulating valve; 17. First bypass; 2. Constant pressure and temperature switching component; 21. First pipeline; 22. First regulating valve; 23. Second pipeline; 24. Second regulating valve; 3. Heating component; 31. Switch valve; 32. Circulating pump; 33. Heater; 34. Element to be heated; 35. Circulating medium inlet; 36. Circulating medium outlet; 37. Second bypass; 38. Drain port; 4. Pressure detection device; 5. Ball valve; 6. Filter; 7. Temperature detection device; 8. Pressure relief pipe; 9. Safety gas replenishment pipe; 10. Oil replenishment pipe; 18. First stop valve; 19. Second stop valve; 20. Solenoid valve. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] In the following description, with reference to the accompanying drawings, several embodiments of the present application are described. It should be understood that other embodiments may also be used, and mechanical composition, structure, electrical and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims of the published patents. The terms used here are only to describe specific embodiments and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0023] This application proposes an automatic constant pressure temperature control system, which has the ability of precise temperature control and constant pressure regulation, and is suitable for industrial production, laboratory environment and applications with strict requirements on temperature and pressure. Figure 1 As shown, the system includes a storage tank 1, a heating component 3, a constant pressure and temperature switching component 2, and a control unit for controlling the operation of the system.

[0024] In the first part, the system's storage tank 1 stores circulating medium, which circulates between the storage tank 1 and the heating component 3. In order to provide cooling function when needed, a cooler is installed inside the storage tank 1, which can effectively reduce the temperature of the circulating medium and ensure that the system can be quickly cooled at high temperatures. In addition, the material of the storage tank 1 is preferably high-pressure resistant and corrosion-resistant material to meet different media and working conditions and ensure the long-term and stable operation of the system.

[0025] Specifically, the storage tank 1 is the core component of the medium storage and circulation in the whole system. Its design takes into account temperature, pressure control and safety protection. The storage tank 1 is provided with a temperature detection device 7 and a pressure detection device 4, which can monitor the temperature and pressure of the medium in the storage tank 1 in real time, ensure that the system is in different temperature control stages, and maintain a stable environment operation. Accurate pressure monitoring can prevent overheating or pressure exceeding the standard, and ensure the safety of system operation. The pressure relief pipe 8 is connected to the upper end of the storage tank 1, which is used to discharge the excess pressure in time when the pressure in the storage tank 1 is too high, so as to prevent the storage tank 1 from being subjected to excessive internal pressure. The design of the end of the pressure relief pipe 8 includes a control valve group composed of multiple regulating and switching valves 31, which ensures accurate pressure control during the pressure relief process. The safety gas replenishment pipe 9 is connected to the upper end of the storage tank 1. When the internal pressure of the system is insufficient, the safety gas can be quickly replenished to maintain the balance of the internal pressure. The control valve group design of the replenishment pipeline is similar to the pressure relief pipe 8, and also includes a multi-stage regulating and switching valve 31 to ensure the safety and accuracy of gas replenishment. The oil replenishment pipe 10 is used to replenish the circulating medium during the operation of the system. In particular, when the liquid medium is reduced, a switch valve 31 is provided on the oil replenishment pipe 10 to also perform oil replenishment operations when necessary to ensure the continuity of the system circulating medium.

[0026] The control valve group on the pressure relief pipe 8 and the safety gas replenishment pipe 9 has the same structure, which includes: a first stop valve 18, which is used to control the primary flow of the medium. As the main switch of the entire pipeline system, it can quickly open and close the fluid channel. The solenoid valve 20 and the second stop valve 19 are connected in parallel between the first stop valve 18 and the storage tank 1. This parallel design can enhance the control flexibility of the system. The solenoid valve 20 can be automatically controlled by an electrical signal to ensure the rapid response of the system, and the second stop valve 19 is used as a manual development device to provide safety protection for the system.

[0027] The coordinated use of the temperature detection device 7 and the pressure detection device 4 enables the system to monitor the medium in the storage tank 1 in real time, and ensures that the temperature is always kept within the set range by controlling the cooler. This precise monitoring improves the temperature control effect of the system and avoids the impact of temperature fluctuations or pressure fluctuations on the system. Through the coordinated work of the pressure relief pipe 8 and the safety gas replenishment pipe 9, the system can automatically adjust the internal pressure during operation to prevent accidents caused by abnormal pressure changes, thereby improving the overall safety and stability of the system.

[0028] The present invention ensures the safety and stability of the system by arranging a temperature detection device 7, a pressure detection device 4, a pressure relief pipe 8, an oil replenishment pipe 10 and a safety gas replenishment pipe 9 on the auxiliary pipeline of the storage tank 1, and cooperating with the locking protection design of the control valve group. The system is particularly suitable for industrial temperature control occasions with high precision and high safety requirements, and can maintain efficient and stable operation of pressure under temperature and changing gaps.

[0029] Specifically, the cooler is mainly used to maintain a constant temperature of the circulating medium in the storage tank 1. The cooler includes a coil 12 arranged inside the storage tank 1 and a refrigerant circulation loop 13 adjacent to the coil 12. The refrigerant enters the coil 12 through the circulation loop and exchanges heat with the circulating medium inside the storage tank 1, thereby reducing the temperature of the circulating medium and ensuring that the system cools down quickly when the heating or delivery temperature is too high. The refrigerant circulation loop 13 includes the following important parts: a refrigerant input pipeline, from which the refrigerant enters the coil 12, and passes through a pressure detection device 4, a ball valve 5, a filter 6, a third regulating valve 16 and a temperature detection device 7 along the way. The pressure detection device 4 monitors the pressure of the refrigerant in real time to ensure that the refrigerant enters the system at a stable pressure to prevent system abnormalities caused by overpressure or underpressure. The ball valve 5 is used to open and close the refrigerant input pipeline to ensure that the refrigerant flow can be quickly shut down in maintenance or emergency situations. The filter 6 filters interruptions in the refrigerant to avoid system blockage due to or caused by particle damage to the system, thereby improving the service life and operational reliability of the system. The third regulating valve 16 adjusts the refrigerant flow entering the coil 12 to further optimize the cooling efficiency and achieve rapid response to temperature changes by precisely controlling the flow. The temperature detection device 7 is used to detect the temperature of the refrigerant in real time to ensure that the cooling effect reaches the expected temperature setting. Furthermore, the refrigerant input pipeline of the cooler is also designed with a first bypass 17, which is subsequently connected to the pressure detection device 4, and the other end is connected to the temperature detection device 7. The flow of the refrigerant in the bypass is controlled by the bypass ball valve 5. Such a design enhances the flexibility of the system in pressure and temperature regulation, and can maintain the flow of the refrigerant when the main circuit of the system is not working, ensuring the response speed and accuracy of temperature and pressure changes. Through the temperature detection device 7 and the regulating valve in the refrigerant input pipeline, the refrigerant flow can be monitored and adjusted in real time, and the temperature can be accurately controlled, ensuring that the system can quickly respond to temperature changes during the cooling process, operate with the most optimized efficiency when necessary, reduce time, and improve the overall efficiency of temperature control. The pressure detection device 4 in the refrigerant input pipeline can ensure that the refrigerant operates within a safe range. With the design of the ball valve 5, the refrigerant flow can be quickly cut off in abnormal situations to avoid overpressure or exhaust of the equipment, and ensure the stable operation of the system. The design of the first bypass 17 enables the system to maintain temperature and pressure control when the main circuit is closed or temporary adjustment is required. By adjusting the bypass ball valve 5, flow and temperature can be controlled without affecting the operation of the main circuit, thereby improving the adjustment accuracy and reliability of the system.

[0030] The cooler design of the present invention realizes rapid and accurate cooling control of the circulating medium by setting the coil 12 and the refrigerant circulation loop 13, combining the temperature and pressure detection device 4, the bypass adjustment structure and other components. This design effectively improves the response speed, control accuracy and safety performance of the temperature control system, and is particularly suitable for industrial applications that have strict requirements on temperature changes and require rapid temperature switching. On the basis of constant pressure and temperature control, the comprehensive performance and applicability of the system are further enhanced.

[0031] In the second part, the heating component 3 includes a switch valve 31, a circulation pump 32 and a heater 33 connected in sequence. The switch valve 31 is connected to the circulating medium outlet 36 of the heating element to control the flow to the heating circuit. The circulation pump 32 passes the circulating medium through the pipeline to the heater 33 to ensure that the heater 33 is responsible for heating the circulating medium flowing through during the heating process, and the pipeline is connected to the inlet of the element to be heated 34. There is a controllable on-off circuit between the heating component 3 and the element to be heated 34, which can flexibly adjust the start and stop of heating according to demand. The heating component 3 of the present invention has an efficient and controllable circulation heating function, and its design further ensures the adjustability of the temperature, pressure and flow of the circulating medium, ensuring stable and reliable operation of the system.

[0032] The heating assembly 3 also includes a temperature detection device 7, a pressure detection device 4 and a ball valve 5; the temperature detection device 7, the pressure detection device 4 and the ball valve 5 are arranged between the heater 33 and the circulating medium inlet 35 of the element to be heated 34. The arrangement of these devices ensures that before the medium enters the heating element, its temperature and pressure can be set for real-time monitoring, and the flow of the medium can be controlled by the ball valve 5. The temperature detection device 7 and the pressure detection device 4 can accurately feedback the actual parameters of the medium to ensure the safety and effectiveness of the heating process.

[0033] Similarly, a temperature detection device 7, a pressure detection device 4 and a ball valve 5 are also provided between the switch valve 31 and the circulating medium outlet 36 of the element to be heated 34. This design enhances the monitoring capability of the system in different circuits and ensures real-time monitoring of the temperature and pressure of the medium whether entering the antenna or directly passing through the bypass.

[0034] The filter 6 at the input end of the switch valve 31 is used to filter the repetition in the medium, ensuring that the circulating medium entering the system is clean and free of particles. This design reduces the risk of pipeline blockage and equipment consumption, and significantly improves the service life and service life of the system.

[0035] The heating assembly 3 also includes a second bypass 37 connecting the output end of the heater 33 and the input end of the circulation pump 32, and the bypass is installed with a ball valve 5. The design of the second bypass 37 allows the medium path to be adjusted and diverted in the bypass under specific operating conditions of the bypass, thereby avoiding excessive impact on the main circuit when full heating is not required. The ball valve 5 of the bypass ensures that the flow state of the bypass can be switched at any time as needed, thereby flexibly controlling the operation of the system.

[0036] The above design enables the multi-point setting of the temperature and pressure detection device 4 to ensure that the system can fully monitor the state of the circulating medium during operation. Regardless of whether the medium enters the heating element 34 through the heater 33 or the switch valve 31, its temperature and pressure can be accurately grasped to ensure the safety of the system and avoid potential safety hazards caused by temperature or pressure exceeding the set range. The design of the second bypass 37 enables the system to flexibly select the flow direction of the medium when full-process heating is not required, avoiding energy waste and ensuring the stable operation of the system. The bypass ball valve 5 makes the flow direction switching tighter and more convenient, adapting to the needs of different working conditions and improving the applicability and flexibility of the system.

[0037] The third part, the constant pressure and temperature switching component 2 realizes the automatic temperature adjustment system under constant pressure, and the component includes the following parts: a first pipeline 21 and a first regulating valve 22, which mainly adjust the flow rate of the circulating medium between the valve of the storage tank 1 and the inlet of the circulating pump 32. The first regulating valve 22 is used to adjust the flow in the first pipeline 21, so as to control the flow rate of the circulating medium in the storage tank 1. Through precise flow regulation, the constant pressure control of the system under different operating conditions can be ensured; the second pipeline 23 and the second regulating valve 24 act between the circulating medium outlet 36 of the heating element 34 and the storage tank 1. The second regulating valve 24 is responsible for adjusting the flow in the second pipeline 23 to realize the reflux of the circulating medium in the heating element 34, and can realize rapid temperature switching on the basis of maintaining constant pressure.

[0038] The first pipeline 21 connects the storage tank 1 and the inlet of the circulation pump 32, and serves as the main channel for the flow of the medium. In order to ensure the cleanliness and safety of the medium before entering the pump, a ball valve 5 and a filter 6 are set on the input side of the first regulating valve 22. The filter 6 can effectively filter the interruption in the medium circulation, prevent the pump and subsequent equipment from being seriously blocked or damaged, and prolong the wear of the equipment. The ball valve 5 on the input side is convenient for maintenance and operation control when the flow is quickly cut off. The output side of the first regulating valve 22 is provided with a drain port 38 to ensure that it can be quickly emptied when the conduit or the medium is replaced. In addition, the setting of the drain port 38 can also discharge excess liquid when problems occur in the system to avoid equipment overload or excessive pressure. The ball valve 5 set on the output side of the first regulating valve 22 is used to control the flow output of the regulating valve. In conjunction with the drain port 38, more flexible flow management can be achieved, improving the operability and safety of the system.

[0039] The second pipeline 23 connects the circulating medium outlet 36 of the heating element 34 and the storage tank 1, and is used to return the medium to the storage tank 1. In order to achieve more reliable flow control, a ball valve 5 is also installed on the second pipeline. The ball valve 5 can flexibly control the reflux of the medium to ensure that the flow can be adjusted according to demand under different working conditions.

[0040] By adjusting the flow rates on the first pipeline 21 and the second pipeline 23, the storage tank 1 is used to supplement or store the circulating medium, thereby flexibly regulating the pressure change of the system to ensure constant system pressure, and adjusting the flow rate on the second pipeline 23 to divert the circulating medium flowing out of the element to be heated 34, and controlling the high-temperature circulating medium to enter the storage tank 1 for cooling and then supplementing and transporting it to the system, so as to achieve rapid temperature control. This design ensures the high efficiency of the medium flow, and at the same time, through flexible flow regulation means, it realizes precise control of temperature and pressure, which is particularly suitable for high efficiency of constant pressure temperature control in industry.

[0041] The control unit can process the data collected by the temperature sensor and the pressure sensor in real time. The control unit ensures that the temperature and pressure in the control system are maintained within the set range by adjusting the actions of the switch valve 31, the circulation pump 32 and the regulating valve, and can quickly switch the temperature according to different operating requirements. In addition, the control unit has an automation function. When the temperature and pressure exceed the set value, the system will automatically adjust and restore the settings to the target parameters.

[0042] The present invention further provides a temperature control method applicable to an automatic constant pressure temperature control system, which determines the adjustment requirements of the medium temperature through different control modes. The system can automatically switch between exhaust, low temperature and cooling modes according to the actual temperature conditions to ensure the stable operation of the system under various working conditions.

[0043] 1. Exhaust mode

[0044] This mode is used to repair the gas in the system and ensure smooth circulation of the system's medium. The constant pressure and temperature switching component 2 is in a fully open state to ensure that the gas quickly breathes into the system. The switch valve 31 of the heating component 3 is allowed to be closed, and only the circulating medium is exhausted through the component to be heated 3. 3 minutes before the end of exhaust (adaptive adjustment is made according to the working conditions), the switch valve 31 is opened so that the diverted part of the medium does not enter the storage tank 1 but enters the heater 33 (turn on the heater 33) through the switch valve 31 for preheating, so as to prepare for subsequent work.

[0045] After the exhaust time is over, the openings of the first regulating valve 22 and the second regulating valve 24 are reduced to the minimum to prevent a sharp increase in pressure during the heating process. This can prevent the medium from expanding and causing high pressure in the system, and ensure that the pressure in the heating process increases sharply, making the flow rate stable.

[0046] 2. Heating mode

[0047] In the heating mode, the temperature of the circulating medium is increased through the heating component 3. The constant pressure and temperature switching component 2 is adjusted to minimize the flow rate to ensure that the medium inside the system circulates mainly through the heating component 3. The circulating pump 32 circulates the medium through the heater 33 for heating and then sends it to the heating element 34, thereby rapidly increasing the temperature of the system. When the system is heated, the medium in the storage tank 1 does not participate in the system circulation.

[0048] 3. Constant temperature mode

[0049] When the system temperature is set, the actual situation will be overheating, that is, the outlet temperature value exceeds the set system temperature value. At this time, the heater 33 will stop heating. This mode is used to keep the system temperature stable and is divided into two control schemes:

[0050] The first control scheme is that in the constant temperature process, the heater 33 is controlled to be closed, and the flow rate of the second pipeline 23 and / or the first pipeline 21 is adjusted to control the temperature of the heating element 34 to drop to a preset temperature difference range. Specifically, when the actual temperature of the heating element 34 exceeds the preset temperature difference range, the temperature difference is large. At this time, the opening of the second regulating valve 24 and the first regulating valve 22 is first opened to the maximum 100%, and the pipeline hot medium is transported to the storage tank 1 to replace the cold medium in the storage tank 1. After a delay of several seconds, the switch valve 31 is closed, and the circulating medium is extracted from the storage tank 1 by the circulating pump 32, output to the heating element 34 through the circulating pump 32 for cooling, and then flows back to the storage tank 1 for circulation;

[0051] When the actual temperature of the element to be heated 34 does not exceed the preset temperature difference range, but exceeds the preset temperature value, the temperature difference is small, the switch valve 31 is opened, the opening of the second regulating valve 24 is reduced, but the opening of the second regulating valve 24 is adjusted to exceed the minimum opening (here set to 0% according to the working conditions). When the opening of the second regulating valve 24 exceeds the minimum opening of the first regulating valve 22 (here set to 20% according to the working conditions) and continues to be adjusted upward, the opening of the first regulating valve 22 is linked with the second regulating valve 24, and the opening and closing degrees are the same. When the opening of the second regulating valve 24 is less than 20% of the minimum opening of the first regulating valve 22, the opening of the first regulating valve 22 remains unchanged at the minimum opening of 20%, and only the opening of the second regulating valve 24 is adjusted to divert a part of the medium passing through the element to be heated 34, and then continue to be output to the element to be heated 34 by the circulating pump 32 for cooling after cooling through the storage tank 1;

[0052] When the actual temperature of the heating element 34 is equal to the preset temperature value, the opening of the second regulating valve 24 is reduced to the minimum opening, and the minimum opening of the second regulating valve 24 is greater than or equal to 0%; and the opening of the first regulating valve 22 is also reduced to the minimum opening, and the minimum opening of the first regulating valve 22 is not less than 20% to prevent the expansion of the medium during the heating process from causing high pressure in the system, and the switch valve 31 remains in the open state.

[0053] The second control scheme is that when the actual outlet temperature value is lower than the set system temperature value, the heater 33 is controlled to be turned on and the second pipeline 23 is closed, and the temperature of the heating element 34 rises to within the preset temperature difference range.

[0054] 4. Cooling mode

[0055] The cooling mode is used to quickly reduce the medium temperature when the system temperature is too high. No need to set the temperature again, directly cool to the one-key cooling temperature that has been set in the previous parameter setting. In this process, the second regulating valve 24 and the first regulating valve 22 are forced to open 100% of the valve opening. After a delay of several seconds, the switch valve 31 is closed, and the pipeline medium is extracted from the storage tank 1 by the circulation pump 32, and output to the heating element 34 through the circulation pump 32. The medium then flows back to the storage tank 1 through the heating element 34. A large circulation process, that is, through the full opening of the constant pressure and temperature switching component 2, the maximum flow of the circulating medium after the cooling tank is cooled is guaranteed, and the switch valve 31 and the heater 33 of the heating component 3 are closed at the same time to ensure that no heating is performed, so that the temperature of the component to be heated is rapidly reduced through the storage tank 1.

[0056] The present invention can maintain constant pressure and temperature output under different working conditions through precise adjustment of the output of the constant pressure and temperature switching component 2 and the heating component 3, ensuring stable operation. The preheating design is carried out in the exhaust mode, so that the circulating medium has been partially heated before preheating, which greatly increases the time required for preheating and improves the overall efficiency. In the thermostatic valve mode, the system accurately controls the flow rate through intelligent adjustment to ensure that the temperature change is maintained within the preset range, ensure stable temperature difference control, and avoid overheating or overcooling. Even under large flow operating conditions, the system can still accurately control the temperature through the regulating valve and the circulation component to meet the needs of high-load work. By optimizing the design of the heating component 3 and the circulation path, the system has a fast response capability, can quickly reach the set temperature, and improve work efficiency. The automatic constant pressure temperature control system provided by the present invention has the functions of high efficiency and low temperature, precise constant temperature, rapid cooling and safe exhaust, which significantly improves the flexibility and safety of the temperature control process, and is suitable for a wide range of industrial occasions with strict temperature requirements.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic constant pressure temperature control system, characterized in that: include: A storage tank, wherein a circulating medium is stored in the storage tank, and a cooler for cooling the circulating medium is provided in the storage tank; A heating component, the heating component comprising a switch valve, a circulation pump and a heater connected in sequence, the switch valve being connected to the circulating medium outlet of the element to be heated, the heater being connected to the circulating medium inlet of the element to be heated, the heating component being connected to the element to be heated to form a controllable on-off loop of the circulating medium; A constant pressure and temperature switching component includes a first pipeline connecting the storage tank to the inlet of the circulation pump, a first regulating valve for regulating the flow of the first pipeline, a second pipeline connecting the circulating medium outlet of the element to be heated and the storage tank, and a second regulating valve for regulating the flow of the second pipeline.

2. The automatic constant pressure temperature control system according to claim 1, characterized in that: The cooler includes a coil arranged inside the storage tank and a refrigerant circulation circuit connecting two ends of the coil.

3. The automatic constant pressure temperature control system according to claim 2, characterized in that: The refrigerant circulation loop includes a refrigerant input pipeline and a refrigerant output pipeline. A pressure detection device, a ball valve, a filter, a third regulating valve, a ball valve, a temperature detection device and a first bypass are sequentially provided on the input end of the refrigerant input pipeline. One end of the first bypass is connected to the pressure detection device and the other end is connected to the temperature detection device. A ball valve is also provided on the first bypass.

4. The automatic constant pressure temperature control system according to claim 1, characterized in that: The storage tank is provided with a temperature detection device, a pressure relief pipe, a safety gas replenishing pipe, an oil replenishing pipe and a pressure detection device; the pressure relief pipe is connected to the upper end of the storage tank, the pressure relief pipe includes a control valve group composed of a number of regulating and switching valves, the safety gas replenishing pipe is connected to the upper end of the storage tank, the safety gas replenishing pipe includes a control valve group composed of a number of regulating and switching valves, and the oil replenishing pipe is provided with a switching valve.

5. The automatic constant pressure temperature control system according to claim 4, characterized in that: The control valve groups on the pressure relief pipe and the safety gas replenishment pipe each include: a first stop valve, and a solenoid valve and a second stop valve connected between the first stop valve and the storage tank, and the solenoid valve and the second stop valve are connected in parallel.

6. The automatic constant pressure temperature control system according to claim 1, characterized in that: A temperature detection device, a pressure detection device and a ball valve are also provided between the heater and the circulating medium inlet of the element to be heated; a temperature detection device, a pressure detection device and a ball valve are provided between the switch valve and the circulating medium outlet of the element to be heated; a filter is provided at the input end of the switch valve; the switch valve and the circulating medium outlet of the heating element, the heating component also includes a second bypass connected between the output end of the heater and the input end of the circulating pump, and a ball valve is provided on the second bypass.

7. The automatic constant pressure temperature control system according to claim 1, characterized in that: The first pipeline is also provided with a ball valve and a filter located at the input side of the first regulating valve, and a ball valve and a drain port located at the output side of the first regulating valve; the second pipeline is also provided with a ball valve.

8. A temperature control method for an automatic constant pressure temperature control system according to any one of claims 1 to 7, characterized in that: Run in any of the following ways: (1) adjusting the opening of the constant pressure and temperature switching component and maximizing the flow rate, and only closing the switch valve of the heating component to exhaust the heating element; (2) adjusting the flow rate of the constant pressure and temperature switching component to a minimum, and turning on the heating component to heat the circulating medium; (3) controlling the heater to be turned off, and adjusting the flow rate of the second pipeline and / or the first pipeline to control the temperature of the element to be heated to fall within a preset temperature difference range; or controlling the heater to be turned on, and closing the second pipeline, so that the temperature of the element to be heated rises to within a preset temperature difference range; (4) The constant pressure and temperature switching components are adjusted to open and have a maximum flow rate, and the switch valve and heater of the heating component are closed to cool the heating element.

9. The temperature control method according to claim 8, characterized in that: In the method (1), the switch valve is opened before the exhaust is completed, so that a part of the circulating medium flowing out of the element to be heated is diverted through the switch valve into the heater to circulate and preheat the medium; after the exhaust time is completed, the opening of the first regulating valve is reduced to the minimum to prevent a sudden increase in pressure during the heating process; the opening of the second regulating valve is reduced to the minimum, and the switch valve is maintained open to ensure that the circulating medium flowing out of the element to be heated is continuously heated by the heater.

10. The temperature control method according to claim 8, characterized in that: The method (3) includes: when the actual temperature of the element to be heated exceeds the preset temperature difference range, the opening of the second regulating valve and the first regulating valve is first opened to a maximum of 100%, and after a delay of several seconds, the switch valve is closed, and the circulating medium is pumped out from the storage tank by the circulating pump, output to the element to be heated through the circulating pump for cooling, and then flows back to the storage tank for circulation; When the actual temperature of the element to be heated does not exceed the preset temperature difference range, but exceeds the preset temperature value, the switch valve is opened, and the opening of the second regulating valve is adjusted to exceed the minimum opening, so as to divert a part of the medium passing through the element to be heated, cool it in the storage tank, and then continue to be output to the element to be heated by the circulation pump for cooling; When the actual temperature of the element to be heated is equal to the preset temperature value, the opening of the second regulating valve is reduced to the minimum opening, and the minimum opening of the second regulating valve is greater than or equal to 0%; and the opening of the first regulating valve is also reduced to the minimum opening, and the minimum opening of the first regulating valve is not less than 20% to prevent the expansion of the medium during the heating process from causing high pressure in the system, and the switch valve is in the open state.

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