Automatic constant-pressure temperature control system

Abstract

The utility model discloses an automatic constant-pressure temperature control system which 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 the 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 utility model relates to temperature control technical field especially relates to a kind of automatic constant pressure temperature control system. BACKGROUND

[0002] Temperature control system plays a vital role in modern industry, laboratory research and precision manufacturing, and is widely used in chemical industry, food processing, pharmaceutical, semiconductor manufacturing and other fields, requiring accurate temperature control to ensure product quality, production efficiency and safety. With the increasing demand for temperature control in these industries, existing temperature control systems have obvious shortcomings in meeting the demand for temperature regulation in multiple scenarios. Existing temperature control systems are usually composed of temperature sensors, heaters, cooling devices, controllers and other components, which monitor the temperature inside the system in real time through temperature sensing elements and adjust the temperature through feedback regulation mechanism. However, these systems often have the following technical defects in practical application: 1. Slow response, temperature switching is not timely, traditional temperature control systems show obvious lag when facing fast temperature switching demand, especially in scenarios where temperature difference increases or needs to be adjusted at intervals, the system is difficult to respond quickly, resulting in temperature increase in the temperature control process, which first affects production efficiency, and temperature switching not in time will directly affect product quality, and even cause process failure; 2. Poor temperature control accuracy, the temperature performance of existing systems is limited, although it can maintain a certain temperature, but when the external environment changes or the system load fluctuates, the temperature is easy to fluctuate greatly, this situation is especially obvious in production processes that need to maintain temperature for a long time, and cannot guarantee the high stability of system temperature, which may cause the temperature difference to be too large, 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 fast response of temperature switching, temperature difference fluctuation control and adjustment, etc. SUMMARY

[0003] The present application proposes an automatic constant pressure temperature control system, which aims to solve the defects of unstable temperature difference control and long time required for temperature rising in the prior art.

[0004] The utility model discloses a kind of automatic constant pressure temperature control systems, it includes: storage tank, the circulating medium is stored in the storage tank, and cooling device is equipped in the storage tank for the circulating medium cooling;Heating assembly, the heating assembly includes the switch valve, circulating pump and heater connected in sequence, the switch valve connects the circulating medium outlet of element to be heated, the heater connects the circulating medium inlet of element to be heated, the heating assembly and the element to be heated are communicated to form the controllable on-off loop of circulating medium;Constant pressure and temperature switching assembly, it includes the first pipe line that the storage tank is communicated to the circulating pump inlet, the first regulating valve that the first pipe line flow is adjusted, the second pipe line that the circulating medium outlet of element to be heated and storage tank are communicated between, and the second regulating valve that the second pipe line flow is adjusted.

[0005] Further, the cooling device includes a coil pipe arranged inside the storage tank and a refrigerant circulation loop communicated with both ends of the coil pipe.

[0006] Further, the refrigerant circulation loop includes a refrigerant input pipe and a refrigerant output pipe, the input end of the refrigerant input pipe is sequentially provided with a pressure detection device, a ball valve, a filter, a third regulating valve, a ball valve, a temperature detection device and a first bypass, 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 the first bypass is also provided with a ball valve.

[0007] Further, the storage tank is provided with a temperature detection device, a pressure relief pipe, a safety gas supplement pipe, an oil supplement 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 plurality of regulating and on-off valves, the safety gas supplement pipe is connected to the upper end of the storage tank, the safety gas supplement pipe includes a control valve group composed of a plurality of regulating and on-off valves, and the oil supplement pipe is provided with an on-off valve.

[0008] Further, the control valve groups on the pressure relief pipe and the safety gas supplement pipe each include a first stop valve, an electromagnetic valve connected between the first stop valve and the storage tank, and a second stop valve, and the electromagnetic valve and the second stop valve are connected in parallel.

[0009] Further, a temperature detection device, a pressure detection device and a ball valve are further arranged 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 arranged between the switch valve and the circulating medium outlet of the element to be heated; the input end of the switch valve is provided with a filter; the switch valve and the circulating medium outlet of the heating element, and the heating assembly further includes a second bypass connected between the output end of the heater and the input end of the circulating pump, and the second bypass is provided with a ball valve.

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

[0011] Compared with the prior art, the automatic constant pressure and temperature control system has the advantages that: through the precise adjustment of the constant pressure and temperature switching assembly output and the heating assembly, the system can maintain constant pressure and temperature output under different working conditions, ensures stable operation, preheating design is carried out in the exhaust mode, the circulating medium is partially heated before preheating, the time required for preheating is greatly increased, the overall efficiency is improved, under the constant temperature valve mode, the system precisely controls the flow through intelligent adjustment, ensures that the temperature change is maintained within the preset interval, ensures stable temperature difference control, and avoids overheating or overcooling. Even under the condition of large flow operation, the system can still precisely control the temperature through the adjusting valve and the circulating assembly, meet the demand of high load work, and the design of the heating assembly 3 and the circulating path is optimized, the system has rapid response capability and can quickly reach the set temperature, thereby improving the work efficiency. The automatic constant pressure and temperature control system has the functions of high efficiency, low temperature, precise constant temperature, rapid cooling and safe exhaust, significantly improves the flexibility and safety in the temperature control process, and is suitable for industrial occasions with strict temperature requirements. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 The drawing is a schematic view of the connection structure of the temperature control system in the present application.

[0014] The main reference signs in the present application are:

[0015] 1, tank; 12, coil; 13, refrigerant circulation loop; 14, refrigerant input pipeline; 15, refrigerant output pipeline; 16, third regulating valve; 17, first bypass; 2, constant pressure and temperature switching assembly; 21, first pipeline; 22, first regulating valve; 23, second pipeline; 24, second regulating valve; 3, heating assembly; 31, on-off valve; 32, circulating pump; 33, heater; 34, element to be heated; 35, circulating medium inlet; 36, circulating medium outlet; 37, second bypass; 38, drain; 4, pressure detection device; 5, ball valve; 6, filter; 7, temperature detection device; 8, pressure relief pipe; 9, safety gas supplement pipe; 10, oil supplement pipe; 18, first stop valve; 19, second stop valve; 20, electromagnetic valve. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and do not limit the utility model.

[0017] In the following description, reference is made to the accompanying drawings which form a part hereof, and which illustrate several embodiments. It is understood that other embodiments can be utilized and mechanical, structural, electrical, and operational changes can be made without departing from the spirit and scope of the present disclosure. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the embodiments of the present application are defined by the appended claims. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Spatially relative terms, such as "upper", "lower", "left", "right", "below", "above", "bottom", "top", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures.

[0018] The present application proposes an automatic constant pressure temperature control system, which has accurate temperature control and constant pressure regulation capacity, and is suitable for industrial production, laboratory environment and application occasions with strict requirements on temperature and pressure. Figure 1 As shown in the figure, the system comprises a storage tank 1, a heating assembly 3, a constant pressure and temperature switching assembly 2, and a control unit for controlling the operation of the system.

[0019] The first part, the storage tank 1 of the system stores circulating medium inside, and the medium circulates and flows between the storage tank 1 and the heating assembly 3. In order to provide cooling function when needed, the storage tank 1 is equipped with a cooler inside, which can effectively reduce the temperature of the circulating medium, and ensure that the system can be quickly cooled at high temperature. In addition, the material of the storage tank 1 is preferably high-pressure resistant and corrosion-resistant material, so as to meet different medium and working conditions, and ensure the long-term stable operation of the system.

[0020] Specifically, the storage tank 1 is the core component of the medium storage and circulation in the whole system, and its design considers 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, maintain stable environment operation, and prevent overheating or pressure exceeding. The accurate monitoring of the pressure can prevent the occurrence of overheating or pressure exceeding, and ensure the safety of the system operation. The pressure relief pipe 8 is connected to the upper end of the storage tank 1, and is used to discharge excess pressure in the storage tank 1 in time when the pressure in the storage tank 1 is too large, so as to prevent the storage tank 1 from bearing excessive internal pressure. The design of the end of the pressure relief pipe 8 includes a control valve group composed of multiple adjusting and on-off valves 31, which ensures accurate pressure control during pressure relief. The safety gas supplement pipe 9 is connected to the upper end of the storage tank 1, and can quickly supplement safety gas to maintain the balance of the internal pressure when the internal pressure of the system is insufficient. The control valve group of the supplement pipe is similar to that of the pressure relief pipe 8, and also includes multiple adjusting and on-off valves 31, which ensures the safety and accuracy of gas supplement. The oil supplement pipe 10 is used to supplement the circulating medium during system operation, especially when the liquid medium is reduced. The oil supplement pipe 10 is provided with an on-off valve 31, which also performs oil supplement operation when necessary, to ensure the continuity of the system circulating medium.

[0021] The control valve groups on the pressure relief pipe 8 and the safety gas supplement pipe 9 are the same structure, which includes: a first stop valve 18 for controlling the primary flow of the medium, which is the main switch of the whole pipeline system and can quickly open and close the fluid passage. The electromagnetic 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 electromagnetic valve 20 can be automatically controlled by an electric 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.

[0022] The cooperation 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 maintained within the set range by controlling the cooler. This precise control improves the temperature control effect of the system and avoids the influence of temperature fluctuations or pressure fluctuations on the system. Through the cooperation of the pressure relief pipe 8 and the safety gas supplement 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.

[0023] The utility model discloses a temperature detection device 7, pressure detection device 4, pressure relief pipe 8, oil supplement pipe 10 and safety gas supplement pipe 9 are arranged on the auxiliary pipeline of the storage tank 1, and the locking protection design of the control valve group is matched, which ensures the safety and stability of the system. The system is particularly suitable for high-precision and high-safety industrial temperature control occasions, and can maintain efficient and stable operation of the pressure under the condition of temperature and change gap.

[0024] Specifically, the cooler is mainly used to maintain the temperature of the circulating medium in the storage tank 1 constant, and the cooler comprises 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 rapid cooling of the system when the heating or conveying temperature is too high. The refrigerant circulation loop 13 includes the following important parts: a refrigerant input pipe through which the refrigerant enters the coil 12, sequentially passing through a pressure detection device 4, a ball valve 5, a filter 6, a third regulating valve 16 and a temperature detection device 7. 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, preventing system abnormalities caused by overpressure or underpressure. The ball valve 5 is used to open and close the refrigerant input pipe to ensure that the refrigerant flow can be quickly closed in the case of maintenance or emergency. The filter 6 filters the interruptions in the refrigerant to avoid pipe or equipment blockage caused by particle damage, thereby improving the service life and operation reliability of the system. The third regulating valve 16 adjusts the flow of refrigerant 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. Further, the refrigerant input pipe 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 refrigerant in the bypass is controlled by the ball valve 5 in the bypass. Such a design enhances the flexibility of the system in pressure and temperature regulation, allowing the refrigerant to flow when the main loop 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 pipe, the flow of refrigerant can be monitored and adjusted in real time to achieve precise control of the temperature, ensuring that the system can quickly respond to temperature changes during the cooling process and operate at the most optimal efficiency when needed, reducing time and improving the overall efficiency of temperature control. The pressure detection device 4 in the refrigerant input pipe can ensure that the refrigerant operates within a safe range, and in combination with the design of the ball valve 5, it can quickly cut off the refrigerant flow in abnormal conditions to avoid equipment overpressure or exhaust, ensuring stable operation of the system. The design of the first bypass 17 allows the system to maintain temperature and pressure control when the main loop is closed or needs to be temporarily adjusted. Through the adjustment of the ball valve 5 in the bypass, the flow and temperature control can be performed without affecting the operation of the main loop, thereby improving the adjustment accuracy and reliability of the system.

[0025] The cooler in the utility model is designed by setting the coil pipe 12 and the refrigerant circulation loop 13, combining the temperature and pressure detection device 4, the bypass adjustment structure and other components, and realizes the quick and accurate cooling control of the circulating medium.

[0026] The second part, the heating assembly 3 comprises a switch valve 31, a circulating pump 32 and a heater 33 which are sequentially connected, the switch valve 31 is connected with the circulating medium outlet 36 of the heating element, controls the flow to the heating loop, the circulating pump 32 circulates the circulating medium through the pipeline to the heater 33, and the heater 33 is responsible for heating the circulating medium flowing through in the heating process, and the pipeline is connected to the inlet of the to-be-heated element 34, and the heating assembly 3 and the to-be-heated element 34 have a controllable on-off loop, and the start and stop of heating can be flexibly adjusted according to the requirement. The heating assembly 3 of the utility model has the efficient and controllable circulating heating function, and the design further guarantees the adjustability of the temperature, pressure and flow of the circulating medium, and guarantees the stable and reliable system operation.

[0027] The heating assembly 3 further comprises a temperature detection device 7, a pressure detection device 4 and a ball valve 5, and 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 to-be-heated element 34, and the arrangement of these devices ensures that the temperature and pressure of the medium can be monitored in real time before the medium enters the heating element, and the flow of the medium is controlled through the ball valve 5, the temperature detection device 7 and the pressure detection device 4 can accurately feed back the actual parameters of the medium, and the safety and effectiveness of the heating process are guaranteed.

[0028] Similarly, the temperature detection device 7, the pressure detection device 4 and the ball valve 5 are also arranged between the switch valve 31 and the circulating medium outlet 36 of the to-be-heated element 34, and the design enhances the monitoring capability of the system in different loops, and ensures that the temperature and pressure of the medium entering the antenna or directly passing through the bypass are monitored in real time.

[0029] The filter 6 of the input end of the switch valve 31 is used for filtering the repetition in the medium, and ensures that the circulating medium entering the system is clean and particle-free. The design reduces the risk of pipeline blockage and equipment consumption, and significantly improves the service life and service life of the system.

[0030] The heating assembly 3 further comprises a second bypass 37 connecting the output of the heater 33 and the input of the circulating pump 32, and the bypass is provided with a ball valve 5, and the second bypass 37 is designed to allow the bypass to adjust and shunt the medium path under specific operating conditions of the bypass, so as to avoid excessive impact on the main circuit when full heating is not required, and the ball valve 5 of the bypass can switch the flow state of the bypass at any time as required, and flexibly control the operation of the system.

[0031] The above design makes the multi-point setting of the temperature and pressure detection device 4 ensure that the system can comprehensively monitor the state of the circulating medium during operation, whether the medium passes through the heater 33 or the on-off valve 31 to enter the heating element 34, the temperature and pressure can be accurately mastered, the safety of the system is ensured, and the safety hidden danger caused by the temperature or pressure exceeding the set range is avoided. The design of the second bypass 37 enables the system to flexibly select the flow direction of the medium when full heating is not required, avoids waste of energy, and ensures stable operation of the system. The ball valve 5 of the bypass makes the flow switching more convenient, adapts to the needs of different operating conditions, and improves the applicability and flexibility of the system.

[0032] The third part, the constant pressure and temperature switching assembly 2 realizes the temperature automatic regulation system under constant pressure, which comprises the following parts: the first pipeline 21 and the first regulating valve 22, which mainly regulate the circulating medium flow between the tank 1 valve 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 of the circulating medium in the tank 1, through accurate 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 on the circulating medium outlet 36 of the heating element 34 and the tank 1, the second regulating valve 24 is responsible for adjusting the flow in the second pipeline 23, realizing the backflow of the circulating medium in the heating element 34, which can realize the rapid switching of temperature on the basis of maintaining constant pressure.

[0033] The first pipeline 21 connects the tank 1 and the inlet of the circulating pump 32, serving 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 arranged 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 the subsequent equipment from being seriously blocked or damaged, prolong the wear of the equipment, and the ball valve 5 on the input side can facilitate the quick cut-off of the flow when maintenance and operation control is required. The output side of the first regulating valve 22 is provided with a drain 38, which can quickly drain the conduit or replace the medium when necessary, and the drain 38 can also remove excess liquid when the system fails, avoiding overloading or excessive pressure of the equipment. The ball valve 5 arranged on the output side of the first regulating valve 22 is used to control the flow output by the regulating valve, which can realize more flexible flow management in cooperation with the drain 38, and improve the operability and safety of the system.

[0034] The second pipeline 23 is connected between the circulating medium outlet 36 of the to-be-heated element 34 and the storage tank 1, and is used for returning the medium to the storage tank 1. In order to realize more reliable flow control, a ball valve 5 is also arranged on the second pipeline. The ball valve 5 can flexibly control the return flow of the medium, and ensures that the flow can be adjusted according to the requirements under different working conditions.

[0035] The pressure of the system is kept constant by flexibly adjusting the pressure change of the system through the flow of the first pipeline 21 and the second pipeline 23, and the flow of the first pipeline 21 is adjusted, the circulating medium is supplemented or stored in the storage tank 1, so that the pressure of the system is kept constant. The flow of the second pipeline 23 is adjusted to branch the circulating medium flowing out of the to-be-heated element 34, control the high-temperature circulating medium to be supplemented into the system after cooling in the storage tank 1, realize rapid temperature regulation, and the efficiency of the medium flow is ensured. At the same time, through the flexible flow adjustment means, the temperature and pressure are accurately controlled, and it is especially suitable for industrial constant pressure and temperature control.

[0036] The control unit can process the data collected by the temperature sensor and the pressure sensor in real time. The control unit adjusts the action of the on-off valve 31, the circulating pump 32 and the regulating valve, ensures that the temperature and pressure in the control system are maintained within the set range, and can quickly switch the temperature according to different operation requirements. In addition, the control unit has an automatic function. When the temperature and pressure exceed the set value, the system will automatically adjust and set the target parameters.

[0037] The utility model further provides a kind of temperature control method suitable for automatic constant pressure temperature control system, and the adjustment requirement of medium temperature is decided by different control mode. The system can automatically switch between exhaust, low temperature and cooling mode according to actual temperature condition, to ensure the stable operation of the system under various working conditions.

[0038] 1. Exhaust mode

[0039] This mode is used to repair the gas in the system to ensure that the medium circulation of the system is smooth. The constant pressure and temperature switching assembly 2 is in full open state, to ensure that the gas is quickly breathed into the system. The on-off valve 31 of the heating assembly 3 is allowed to be closed, and only the circulating medium passes through the to-be-heated element 3 to exhaust. 3min (adapted according to working conditions) before the end of exhaust, open the on-off valve 31, so that the medium diversion part does not enter the storage tank 1 but enters the heater 33 (open the heater 33) to preheat, and prepare for the subsequent work.

[0040] After the exhaust time ends, the opening degrees of the first regulating valve 22 and the second regulating valve 24 are respectively reduced to the minimum to prevent the pressure from sharply increasing during the temperature rising process, so that both the high pressure caused by the medium expansion and the sharp pressure increase during the temperature rising process can be avoided.

[0041] 2. Temperature rising mode

[0042] In the temperature rising mode, the temperature of the circulating medium is raised by the heating assembly 3. The constant pressure and temperature switching assembly 2 is adjusted to make the flow reach the minimum, so that the medium in the system is mainly circulated through the heating assembly 3, and the circulating pump 32 circulates the medium through the heater 33 for heating and then sends the medium into the element to be heated 34, so as to rapidly raise the temperature of the system. When the system is rising in temperature, the medium in the storage tank 1 does not participate in the circulation of the system.

[0043] 3. Constant temperature mode

[0044] When the heating reaches the set system temperature, the actual situation may appear that the heating amount exceeds the present situation, that is, the outlet temperature value exceeds the set system temperature value. At this time, the heater 33 stops heating. This mode is used to maintain the stability of the temperature of the system, and there are two control schemes:

[0045] The first control scheme is that, during the constant temperature process, the heater 33 is controlled to be closed, and the flow of the second pipeline 23 and / or the first pipeline 21 is adjusted to control the temperature of the element to be heated 34 to drop to the preset temperature difference interval. Specifically, when the actual temperature of the element to be heated 34 exceeds the preset temperature difference interval, the temperature difference is large. At this time, the opening degrees of the second regulating valve 24 and the first regulating valve 22 are first opened to the maximum 100%, so that the pipeline heat medium is delivered to the storage tank 1 to replace the cold medium in the storage tank 1. After a delay for several seconds, the on-off valve 31 is closed, the circulating medium is pumped out from the storage tank 1 by the circulating pump 32, output to the element to be heated 34 for cooling, and then flows back to the storage tank 1 for circulation.

[0046] When the actual temperature of the element to be heated 34 does not exceed the preset temperature difference interval, but exceeds the preset temperature value, the temperature difference is small. The on-off valve 31 is opened, and the opening degree of the second regulating valve 24 is adjusted to be small. However, the opening degree of the second regulating valve 24 is adjusted to be greater than the minimum opening degree (which is set to 0% according to the working condition at this time). When the opening degree of the second regulating valve 24 is greater than the minimum opening degree of the first regulating valve 22 (which is set to 20% according to the working condition at this time), and continues to be adjusted to be larger, the opening degree of the first regulating valve 22 is linked with the opening degree of the second regulating valve 24, and the opening and closing degrees are the same. When the opening degree of the second regulating valve 24 is less than the minimum opening degree of the first regulating valve 22 (20%), the opening degree of the first regulating valve 22 remains the minimum opening degree of 20% unchanged, and only the opening degree of the second regulating valve 24 is adjusted, so that a part of the medium passing through the element to be heated 34 is cooled in the storage tank 1 and then output to the element to be heated 34 by the circulating pump 32 for cooling.

[0047] When the actual temperature of the to-be-heated element 34 is equal to the preset temperature value, at this time, the opening degree of the second regulating valve 24 is reduced to the minimum opening degree, the minimum opening degree of the second regulating valve 24 is greater than or equal to 0%; and the opening degree of the first regulating valve 22 is also reduced to the minimum opening degree, and the minimum opening degree of the first regulating valve 22 is not lower than 20% at least to prevent the medium expansion from causing high pressure of the system in the temperature rising process, and the on-off valve 31 remains in the open state.

[0048] 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 controlled to be closed, and the temperature of the to-be-heated element 34 rises to the preset temperature difference interval.

[0049] 4. Cooling mode

[0050] The cooling mode is used to rapidly reduce the medium temperature when the system temperature is too high. Without setting the temperature, the temperature is directly cooled to the one-key cooling temperature which has been set in the previous parameter setting. In this process, the opening degrees of the second regulating valve 24 and the first regulating valve 22 are forced to be 100%, and after a delay for several seconds, the on-off valve 31 is closed. The pipeline medium is drawn out from the storage tank 1 by the circulating pump 32, output to the to-be-heated element 34 by the circulating pump 32, and flows back to the storage tank 1 through the to-be-heated element 34, that is, through the full opening of the constant pressure and temperature switching assembly 2, the maximum flow of the circulating medium after the cooling tank is cooled is ensured, and the on-off valve 31 and the heater 33 of the heating assembly 3 are closed, so that heating is not performed again, and the temperature of the to-be-heated element is rapidly reduced through the storage tank 1.

[0051] The utility model discloses the accurate regulation of the constant pressure and temperature switching assembly 2 output and the heating assembly 3, the system can keep constant pressure and temperature output under different working conditions, ensures stable operation, carries out preheating design in exhaust mode, makes the circulating medium be partly heated before preheating, greatly increases the time required for preheating, improves the overall efficiency, under the constant temperature valve mode, the system accurately controls the flow through intelligent regulation, ensures that the temperature change maintains in the preset interval, ensures that the temperature difference control is stable, avoids overheating or overcooling phenomenon. Even under the condition of large flow operation, the system can still accurately control the temperature through the regulating valve and the circulating assembly, meet the demand of high load work, optimize the design of the heating assembly 3 and the circulating path, the system has rapid response capability, can rapidly reach the set temperature, improves work efficiency. The automatic constant pressure temperature control system provided by the utility model has the functions of high efficiency, low temperature, accurate constant temperature, rapid cooling and safe exhaust, significantly improves the flexibility and safety in the temperature control process, and is suitable for industrial occasions with strict temperature requirements.

[0052] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic constant pressure temperature control system, characterized by, The application relates to a circulating medium heating device. The device comprises a storage tank, a cooling device, a heating assembly, a constant pressure and temperature switching assembly, a temperature detecting device, a pressure detecting device, a relief pipe, a safety gas supplement pipe, an oil supplement pipe, a filter, a ball valve and a second bypass. The cooling device comprises a coil pipe and a refrigerant circulating loop. The storage tank is provided with a temperature detecting device, a pressure detecting device, a relief pipe, a safety gas supplement pipe, an oil supplement pipe, a filter, a ball valve and a second bypass.

2. The automatic constant pressure and temperature control system according to claim 1, wherein, The relief pipe and the safety gas supplement pipe each comprise a first stop valve, an electromagnetic valve and a second stop valve.

3. The automatic constant pressure and temperature control system according to claim 1, wherein, The heating assembly and the circulating medium inlet of the heating element are provided with a temperature detecting device, a pressure detecting device and a ball valve.

4. The automatic constant pressure temperature control system according to claim 3, wherein, The switch valve and the circulating medium outlet of the heating element are provided with a temperature detecting device, a pressure detecting device and a ball valve.

5. The automatic constant pressure temperature control system according to claim 1, wherein, The switch valve is provided with a filter.

6. The automatic constant pressure and temperature control system according to claim 1, wherein, The first pipe is provided with a ball valve and a filter on the input side of the first regulating valve and a ball valve and a drain on the output side of the first regulating valve. The second pipe is provided with a ball valve.

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