Electronic pressure controller and its adjustment control method, gas chromatograph
By introducing a temperature control module and PID algorithm into the electronic pressure controller, the impact of temperature changes on pressure control accuracy is resolved, achieving higher precision pressure detection and control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HANGZHOU HIKVISION DIGITAL TECHNOLOGY CO LTD
- Filing Date
- 2024-12-27
- Publication Date
- 2026-06-30
Smart Images
Figure CN122308489A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of electronic pressure controller technology, and particularly relates to an electronic pressure controller and its regulation and control method, and a gas chromatograph. Background Technology
[0002] An electronic pressure controller is a measuring instrument used for various pressure applications, including water and gas systems. For example, it is a basic component in gas chromatographs. Employing automatic control technology, it ensures stable gas pressure / flow, providing more reliable and comprehensive support for the reproduction, optimization, and automation of chromatographic conditions. An electronic pressure controller typically consists of a pressure sensor, control valve, inlet / outlet ports, and an electronic control board. Based on the pressure data acquired by the pressure sensor, a control algorithm adjusts the control valve to ensure that the pressure in the inlet / outlet gas path reaches the target setpoint.
[0003] Since electronic pressure controllers in pneumatic systems generally need to pass through the measured medium, the temperature of the measured medium may fluctuate significantly. On the other hand, the environment in which the controller is located may also be affected by various temperature fluctuations, resulting in significant fluctuations. Large temperature fluctuations often cause drift and deviation in pressure sensor readings, affecting the accuracy of pressure control. Summary of the Invention
[0004] The purpose of this invention is to provide an electronic pressure controller that solves the problem of low pressure control accuracy caused by temperature fluctuations in traditional electronic pressure controllers.
[0005] A first aspect of this invention provides an electronic pressure controller, comprising:
[0006] The housing includes an inlet and an outlet for the measured medium to enter and exit, and a conduit connecting the inlet and the outlet for the flow of the measured medium.
[0007] A pressure regulating valve and a pressure sensor are sequentially installed on the pipeline. The pressure sensor is used to detect the pressure of the pipeline and output a pressure signal.
[0008] The temperature control module is disposed within the housing. The temperature control module includes a fan, a first heating component, and a first temperature sensor. The fan, the first heating component, the pressure sensor, and the first temperature sensor are sequentially and spaced apart in a circulating return path that allows air to circulate. The first temperature sensor is used to detect the temperature of the circulating return path and output a first temperature signal.
[0009] An electronic control board is disposed within the housing. The electronic control board is connected to the pressure regulating valve, the fan, the first heating assembly, the first temperature sensor, and the pressure sensor, respectively. The electronic control board is used for:
[0010] The fan is controlled to rotate or stop rotating according to the first temperature signal, and / or the first heating component is controlled to heat or stop heating, so as to adjust the temperature of the circulation return path within a first preset temperature threshold.
[0011] And adjust the opening degree of the pressure regulating valve according to the pressure signal to regulate the pressure of the pipeline within a preset pressure threshold.
[0012] Optionally, the electronic control board is specifically used for:
[0013] The temperature of the circulation return path is determined based on the first temperature signal, and the temperature of the circulation return path is compared with the first preset temperature threshold.
[0014] When the temperature of the circulating return path is within the first preset temperature threshold, the fan is controlled to stop rotating and the first heating component is controlled to stop heating.
[0015] When the temperature of the circulating return path exceeds the first preset temperature threshold, the parameters of the PID algorithm are calculated and determined based on the temperature of the circulating return path.
[0016] PID adjustment is performed based on the determined parameters of the PID algorithm, the temperature of the circulating return path, and the first preset temperature threshold to determine the fan speed and / or adjust the heating power of the first heating component.
[0017] Optionally, when the temperature of the circulating return path is lower than the first preset temperature threshold, the electronic control board controls the fan to rotate at a preset wind speed and controls the first heating component to heat at a preset power.
[0018] When the temperature of the circulating return path is higher than the first preset temperature threshold, the electronic control board controls the fan to rotate at a preset wind speed and controls the first heating component to stop heating.
[0019] Optionally, the pressure sensor includes:
[0020] The second temperature sensor is connected to the electronic control board. The second temperature sensor is used to detect the internal temperature of the pressure sensor and output a second temperature signal.
[0021] A pressure-sensitive device is connected to the electronic control board. The pressure-sensitive device is set with a pressure detection point corresponding to the pressure sensor. The pressure detection point is used to correspond to the pipeline. The pressure-sensitive device detects the pressure of the pipeline through the pressure detection point.
[0022] The heating film is connected to the electronic control board;
[0023] The electronic control board is also used for:
[0024] The second temperature signal is acquired, and the heating film is controlled to heat or stop heating according to the second temperature signal, so as to adjust the internal temperature of the pressure sensor to within the second preset temperature threshold.
[0025] Optionally, the pressure sensor further includes:
[0026] The circuit board includes a first side and a second side disposed opposite to each other, the second temperature sensor and the pressure-sensitive device are disposed on the first side of the circuit board, and the circuit board is also connected to the electronic control board;
[0027] The heating film is arranged side by side with the circuit board at a distance, and the heating film is located on one side of the first side of the circuit board.
[0028] Optionally, the heating film is further provided with a first opening, through which the end of the pressure-sensitive device extends into the pipeline.
[0029] Optionally, the pressure sensor further includes:
[0030] The substrate has the heating film laid flat on it, and the substrate and the circuit board are arranged side by side with a gap between them. A second opening is provided on the substrate corresponding to the first opening of the heating film, and the end of the pressure-sensitive device extends through the second opening of the substrate to the pipeline.
[0031] Optionally, the housing is further provided with a receiving cavity, and the electronic control board and the circulation return path are disposed in the receiving cavity.
[0032] Optionally, the first heating component is a heating wire.
[0033] A second aspect of the present invention provides a gas chromatograph including an electronic pressure controller as described above.
[0034] A third aspect of this invention provides a regulation and control method for an electronic pressure controller, applied to the electronic pressure controller described above. The regulation and control method for the electronic pressure controller includes:
[0035] Obtain the temperature of the circulation return path and the pressure of the pipeline;
[0036] The fan is controlled to rotate or stop rotating based on the temperature of the circulating return path, and / or the first heating component is controlled to heat or stop heating, so as to adjust the temperature of the circulating return path within a first preset temperature threshold.
[0037] The opening and closing degree of the pressure regulating valve is adjusted according to the pressure in the pipeline to regulate the pressure in the pipeline within a preset pressure threshold.
[0038] Optionally, controlling the fan to rotate or stop rotating based on the temperature of the circulating return path, and / or controlling the first heating component to heat up or stop heating, includes:
[0039] Compare the temperature of the circulating return path with the first preset temperature threshold.
[0040] When the temperature of the circulating return path is within the first preset temperature threshold, the fan is controlled to stop rotating and the first heating component is controlled to stop heating.
[0041] When the temperature of the circulating return path exceeds the first preset temperature threshold, the parameters of the PID algorithm are calculated and determined based on the temperature of the circulating return path.
[0042] PID adjustment is performed based on the determined parameters of the PID algorithm, the temperature of the circulating return path, and the first preset temperature threshold to determine the fan speed and / or adjust the heating power of the first heating component.
[0043] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The above-mentioned electronic pressure controller includes a housing, an inlet, an outlet, a pipeline, a pressure regulating valve, and a temperature control module disposed in the housing. The temperature control module includes a fan, a first heating component, and a first temperature sensor. The fan, the first heating component, the pressure sensor, and the first temperature sensor are sequentially and spaced apart in a circulating return path that allows air to circulate. The electronic control board determines the current ambient temperature of the pressure sensor through the first temperature signal fed back by the first temperature sensor, and controls the first heating component and the fan to work accordingly, thereby realizing the regulation and control of the ambient temperature of the pressure sensor, so that the ambient temperature of the pressure sensor is maintained within a first preset temperature threshold, reducing the impact of temperature changes on the pressure sensor, and improving the accuracy of pressure detection and control. The electronic control board is also used to adjust the opening and closing degree of the pressure regulating valve according to the pressure signal obtained by the pressure sensor, thereby adjusting the pressure of the pipeline within the preset pressure threshold and realizing the pressure control function. Attached Figure Description
[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0045] Figure 1 This is a schematic diagram of a first structure of an electronic pressure controller provided in an embodiment of the present invention;
[0046] Figure 2 This is a schematic diagram of a first type of module of an electronic pressure controller provided in an embodiment of the present invention;
[0047] Figure 3 This is a schematic diagram of a second structure of an electronic pressure controller provided in an embodiment of the present invention;
[0048] Figure 4 This is a schematic diagram of a third structure of an electronic pressure controller provided in an embodiment of the present invention;
[0049] Figure 5 This is a schematic diagram of a fourth structure of an electronic pressure controller provided in an embodiment of the present invention;
[0050] Figure 6 This is a schematic diagram of PID regulation of the electronic control board provided in an embodiment of the present invention;
[0051] Figure 7 This is a schematic diagram of a second module of an electronic pressure controller provided in an embodiment of the present invention;
[0052] Figure 8 This is a schematic diagram of the structure of a pressure sensor provided in an embodiment of the present invention;
[0053] Figure 9 An exploded view of a pressure sensor provided in an embodiment of the present invention;
[0054] Figure 10 This is a schematic diagram of the structure of the heating film and substrate provided in an embodiment of the present invention;
[0055] Figure 11 A schematic flowchart of the adjustment and control method provided in an embodiment of the present invention;
[0056] Figure 12 This is a flowchart illustrating step S20 of the adjustment and control method provided in an embodiment of the present invention.
[0057] The figures in the diagram are labeled as follows:
[0058] 100. Electronic pressure controller; 10. Housing; 21. Inlet; 22. Outlet; 23. Pipeline; 30. Pressure regulating valve; 40. Pressure sensor; 50. Circulation return path; 60. Fan; 70. First heating component; 80. First temperature sensor; 90. Control board; 110. Receiving cavity; 41. Second temperature sensor; 42. Pressure sensitive device; 43. Heating film; 441. First housing; 442. Second housing; 45. Circuit board; 46. Substrate; 431. First opening; 461. Second opening; 4411. Through hole; 31. Total carrier gas proportional valve; 32. Diverter proportional valve; 33. Diaphragm proportional valve; 111. Total carrier gas inlet; 121. Total carrier gas outlet; 112. Diverter inlet; 122. Diverter outlet; 113. Diaphragm inlet; 123. Diaphragm outlet; 120. Partition; 130. Flow sensor;
[0059] T1, temperature of the circulation path; Tref1, first preset temperature threshold. Detailed Implementation
[0060] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0061] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0062] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.
[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0064] The first aspect of this invention provides an electronic pressure controller 100 for detecting and controlling the pressure of a measured medium, which may be a gas, liquid, etc.
[0065] like Figure 1 and Figure 2 As shown, the electronic pressure controller 100 includes:
[0066] The housing 10 includes an inlet 21 and an outlet 22 for the measured medium to enter and exit, and a pipe 23 connecting the inlet 21 and the outlet 22, the pipe 23 being used to supply the flow of the measured medium;
[0067] A pressure regulating valve 30 and a pressure sensor 40 are sequentially installed on the pipeline 23. The pressure sensor 40 is used to detect the pressure of the pipeline 23 and output a pressure signal.
[0068] The temperature control module is installed inside the housing 10. The temperature control module includes a fan 60, a first heating component 70 and a first temperature sensor 80. The fan 60, the first heating component 70, the pressure sensor 40 and the first temperature sensor 80 are arranged in a circulating return path 50 that allows air to circulate. The first temperature sensor 80 is used to detect the temperature of the circulating return path 50 and output a first temperature signal.
[0069] An electronic control board 90 is disposed within the housing 10. The electronic control board 90 is connected to the pressure regulating valve 30, the fan 60, the first heating component 70, the pressure sensor 40, and the first temperature sensor 80, respectively. The electronic control board 90 is used for:
[0070] The fan 60 is controlled to rotate or stop rotating according to the first temperature signal, and / or the first heating component 70 is controlled to heat or stop heating, so as to adjust the temperature T1 of the circulation return path 50 within the first preset temperature threshold Tref1;
[0071] And adjust the opening degree of the pressure regulating valve 30 according to the pressure signal to regulate the pressure of the pipeline 23 within the preset pressure threshold.
[0072] In this embodiment, the electronic control board 90 is equipped with a controller, processor and other control processing units. The electronic pressure controller 100 can also be equipped with corresponding input modules, such as buttons, touch screens, etc. The input modules are connected to the control processing units. The control processing modules can set a first preset temperature threshold Tref1 by programming or by the input modules. For example, the first preset temperature threshold Tref1 can be set to 20℃~40℃. The temperature range of the first preset temperature threshold Tref1 can also be modified as needed when the electronic pressure controller 100 is working.
[0073] Inlet 21, pipe 23, pressure regulating valve 30, and outlet 22 constitute the transmission pipeline for the measured medium. The transmission pipeline, combined with pressure sensor 40, forms the pressure control module of electronic pressure controller 100. Pressure regulating valve 30 and pressure sensor 40 are sequentially installed on pipe 23. Pressure regulating valve 30 and pressure sensor 40 are electrically connected to electronic control board 90. Pressure regulating valve 30 can switch to different opening degrees according to the pressure regulation signal output by electronic control board 90, thereby controlling the pressure of pipe 23. Pressure regulating valve 30 can be a corresponding solenoid valve, such as a proportional valve. Pressure sensor 40 is used to detect the pressure of pipe 23 after adjustment and feeds back the pressure data to electronic control board 90. Pressure sensor 40 can be installed on pipe 23 through sensor interface, or a branch pipe can be set on pipe 23 and pressure sensor 40 can be installed on the branch pipe to indirectly detect the pressure of pipe 23. Its setting method can be set according to the pressure detection requirements.
[0074] The circulation return path 50 can be formed by the internal space of the electronic pressure controller 100, or it can be formed by building it with corresponding plates and modules during the design process. The specific formation method is not limited.
[0075] The circulation return path 50 can be a closed space for heat dissipation through heat exchange. The circulation return path 50 can also be equipped with corresponding air vents for heat exchange between fresh air and hot air with the outside. The specific structure is not limited.
[0076] The first heating component 70 may adopt a structure such as a resistance wire or a heating film. In an optional embodiment, the first heating component 70 includes a heating wire with a certain impedance. When the control board 90 applies current, the heating wire heats up and generates different amounts of heat under different current magnitudes, thereby achieving heating at different temperatures and rates.
[0077] For example Figures 3 to 5As shown, one type of electronic pressure controller 100 is used in a gas chromatograph, including a total carrier gas proportional valve 31, a split port proportional valve 32, and a septum proportional valve 33. A pressure sensor 40 is mounted on the septum proportional valve 33. The total carrier gas proportional valve 31 is connected to the total carrier gas inlet 111 and the total carrier gas outlet 121 on the housing 10. The split port proportional valve 32 is connected to the split inlet 112 and the split outlet 122 on the housing 10. The septum proportional valve 33 is connected to the septum inlet 113 and the septum outlet 123. The pressure sensor 40 is connected in series in the pipes inside the septum proportional valve 33. A flow sensor 130 may also be installed on the total carrier gas proportional valve 31 for detecting... The total inlet gas flow rate is measured. The gas flows in through the total carrier gas inlet 111 and is pressure regulated by the total carrier gas proportional valve 31. It is then split into three outputs through the total carrier gas outlet 121 and external pipelines. One output is sent to the injection port of the chromatographic column. Another output is transmitted through pipelines to the split inlet 112 and the split port proportional valve 32. The split port proportional valve 32 and the split outlet 122 are used to achieve the gas split proportional output. The third output is sent through the septum inlet 113 to the septum proportional valve 33 and is proportionally output through the septum proportional valve 33 and the septum outlet 123. The gas output by the septum proportional valve 33 is used to purge impurities from the gas output to the injection port.
[0078] The electronic pressure controller 100 also has a partition 120 inside its housing. The partition 120 can be L-shaped and is located between the fan 60, the first heating component 70, the pressure sensor 40 and the first temperature sensor 80. It is used to form a circulation path 50 between the fan 60, the first heating component 70, the pressure sensor 40 and the first temperature sensor 80, so that the heating gas or the cooling gas can circulate sequentially in the direction of the arrow in the figure.
[0079] The control processing unit on the electronic control board 90 detects the pressure data of the current pipeline 23 through the pressure sensor 40, compares the pressure data with the internally stored preset pressure threshold, and adjusts the opening degree of the pressure regulating valve 30 through the control algorithm so that the pressure in the pipeline reaches the preset pressure threshold. The preset pressure threshold can be a single value or a range of values.
[0080] Under different temperature fluctuations of the measured medium, the readings of the pressure sensor 40 will drift and deviate, leading to a decrease in the accuracy of pressure detection and control. To reduce the operating temperature variation of the pressure sensor 40, for example, if the temperature of the measured medium passing through the electronic pressure controller 100 may fluctuate significantly, or if the environment in which the electronic pressure controller 100 is located may be affected by various temperature fluctuations, a circulation loop 50 is formed inside the electronic pressure controller 100. The pressure sensor 40 and the temperature control module are disposed in the circulation loop 50. The temperature control module includes a fan 60, a first heating element 70, and a first temperature sensor 80. The fan 60, the first heating element 70, the pressure sensor 40, and the first temperature sensor 80 are sequentially and alternately disposed in the circulation loop 50. Figure 1 As shown, the four components are symmetrically arranged at corresponding positions in the circulation path 50. It can be understood that the positions of the four components are not limited to symmetrical arrangement. It is only necessary to ensure that the air in the circulation path 50 circulates in sequence along the routes of the fan 60, the first heating component 70, the pressure sensor 40, and the first temperature sensor 80.
[0081] When the fan 60 starts, it drives the air circulating in the return path 50. When the first heating component 70 is heating, the air undergoes heat exchange through the first heating component 70 and outputs hotter air to the pressure sensor and the first temperature sensor 80, thereby heating the air in the return path 50, i.e., heating the ambient temperature of the pressure sensor 40. When the first heating component 70 is not heating, the fan 60 drives the air circulating in the return path 50 and cools the ambient temperature of the pressure sensor 40 and the first temperature sensor 80. By controlling the fan 60 and the first heating component 70, the temperature of the pressure sensor 40 can be controlled when faced with the influence of the external ambient temperature of the electronic pressure controller 100, reducing the influence of the external environment and improving the accuracy of pressure detection and control.
[0082] The control board 90 can be located inside or outside the circulation return path 50. To reduce the impact of the control board 90 or other actuators such as the pressure regulating valve 30 on the internal temperature of the circulation return path 50, in an optional embodiment, such as... Figure 1 As shown, a receiving cavity 110 is also provided inside the housing 10. The electronic control board 90 and the circulation return path 50 are disposed inside the receiving cavity 110. That is, the electronic control board 90 is disposed outside the circulation return path 50. The heat generated by the electronic control board 90, pressure regulating valve 30 and other actuators will not affect the internal temperature of the circulation return path 50, and thus will not affect the working temperature and working performance of the pressure sensor 40, thereby improving the accuracy of the pressure sensor 40 reading.
[0083] The temperature control timing of the electronic pressure controller 100 can occur at startup or during operation.
[0084] When the electronic pressure controller 100 is initially powered on, the electronic control board 90 initiates the main control temperature control of the first preset temperature threshold Tref1.
[0085] Due to the influence of different external environments on the electronic pressure controller 100, such as the different positions of the measured medium and external heating components, or their asymmetrical arrangement in the electronic pressure controller 100, the temperature in the circulation loop 50 may be unbalanced in the initial power-on state, resulting in a problem of high temperature on one side and low temperature on the other side, causing a temperature difference. This may lead to a temperature difference between the internal pressure sensor 40 and the first temperature sensor 80. To avoid this situation, when the electronic control board 90 is powered on, it first outputs a fan 60 control signal to control the fan 60 to rotate, so that the air in the circulation loop 50 circulates, thereby making the temperature T1 of the circulation loop 50 more uniform. Then, it acquires the first temperature signal detected by the first temperature sensor 80, improving the accuracy of temperature T1 detection in the circulation loop 50.
[0086] The electronic control board 90 obtains the temperature in the current circulation loop 50 through the first temperature sensor 80 and compares it with the first preset temperature threshold Tref1. It determines whether the current temperature T1 of the circulation loop 50, i.e. the ambient temperature of the current pressure sensor 40, has reached the first preset temperature threshold Tref1. As needed, it restarts the fan 60 and / or controls the first heating component 70 to work to achieve heating or cooling, thereby balancing the temperature T1 of the circulation loop 50 to the first preset temperature threshold Tref1.
[0087] For example, in the initial state, the ambient temperature of the electronic pressure controller 100 is low, and heat exchange occurs between the inside and outside of the electronic pressure controller 100, resulting in a low temperature T1 in the circulation loop 50 of the electronic pressure controller 100, which is less than the first preset temperature threshold Tref1. When the electronic control board 90 detects the current temperature T1 of the circulation loop 50, it starts the fan 60 and the first heating component 70 in sequence. The first heating component 70 heats and carries the heat to the entire circulation loop 50 through the fan 60, raising the temperature T1 of the circulation loop 50. When the temperature T1 of the circulation loop 50 reaches the first preset temperature threshold Tref1, the first heating component 70 is controlled to stop heating, and the fan 60 can be selectively turned on or off.
[0088] Alternatively, in the initial state, the ambient temperature of the electronic pressure controller 100 is high, and heat exchange occurs between the inside and outside of the electronic pressure controller 100, resulting in a high temperature T1 in the circulation return path 50 of the electronic pressure controller 100, which is higher than the first preset temperature threshold Tref1. When the electronic control board 90 detects the current temperature T1 of the circulation return path 50, it starts the fan 60, shuts down the first heating component 70, and cools the entire circulation return path 50 by using the fan 60 to reduce the temperature T1 of the circulation return path 50. When the temperature T1 of the circulation return path 50 reaches the first preset temperature threshold Tref1, it controls the fan 60 to stop rotating.
[0089] When the ambient temperature of the pressure sensor 40 reaches the first preset temperature threshold Tref1, that is, when the pressure sensor 40 is operating at the set temperature, the electronic control board 90 then performs the control work of the pressure control module. That is, the pressure sensor 40 detects the current pressure data of the pipeline 23, compares the pressure data with the internally stored preset pressure threshold, and adjusts the opening degree of the pressure regulating valve 30 through the control algorithm, so that the pressure in the pipeline 23 reaches the preset pressure threshold.
[0090] Furthermore, during the operation of the electronic pressure controller 100, the environment in which the electronic pressure controller 100 is located, the measured medium, and the temperature of the electronic control board 90 may change, thereby affecting the temperature T1 of the circulation return path 50 of the electronic pressure controller 100 through heat exchange. To this end, the electronic control board 90 also monitors the temperature T1 of the circulation return path 50 in real time through the first temperature sensor 80, and selectively turns on the fan 60 and / or heating components when the temperature T1 of the circulation return path 50 exceeds the first preset temperature threshold Tref1, thereby realizing active constant temperature control of the circulation return path 50.
[0091] The electronic pressure controller 100 operates in different states, resulting in varying heat generation from its operating power. Consequently, the overall system of the electronic pressure controller 100 experiences different system states due to these different operating conditions, affecting the temperature T1 of the internal circulation loop 50 differently. Therefore, using constant fan speed or constant heating power for temperature control leads to inefficiencies and low temperature control efficiency. To improve temperature control efficiency, in an optional embodiment, the electronic control board 90 is specifically used for:
[0092] The temperature T1 of the circulation path 50 is determined based on the first temperature signal, and the temperature T1 of the circulation path 50 is compared with the first preset temperature threshold Tref1.
[0093] When the temperature T1 of the circulation path 50 is within the first preset temperature threshold Tref1, control the fan 60 to stop rotating and control the first heating component 70 to stop heating.
[0094] When the temperature T1 of the circulation loop 50 exceeds the first preset temperature threshold Tref1, the parameters of the PID algorithm are calculated and determined based on the temperature T1 of the circulation loop 50.
[0095] Based on the determined parameters of the PID algorithm, the temperature of the circulation loop 50, and the first preset temperature threshold Tref1, PID adjustment is performed to determine the fan speed of the fan 60 and / or adjust the heating power of the first heating component 70.
[0096] In this embodiment, the electronic control board 90 first compares the detected temperature T1 of the circulating return path 50 with the first preset temperature threshold Tref1 to determine whether it is within the first preset temperature threshold Tref1. When the detected temperature T1 of the circulating return path 50 is within the first preset temperature threshold Tref1, it indicates that there is no need to perform heating or cooling control at present, and the current temperature can meet the working temperature of the pressure sensor 40. At this time, the electronic control board 90 controls the fan 60 to stop rotating and controls the first heating component 70 to stop heating.
[0097] When the temperature T1 of the circulating return path 50 is detected to exceed the first preset temperature threshold Tref1, it indicates that an overheating or underheating situation has occurred and temperature control is required. The control processing module of the electronic control board 90 has a PID algorithm in memory, and controls the first heating component 70 and the fan 60 based on the PID algorithm, thereby achieving constant temperature control of the current circulating return temperature.
[0098] Specifically, such as Figure 6 As shown, the electronic control board 90 performs PID adjustment based on the PID algorithm, the detected temperature T1 of the circulating return path 50, and the first preset temperature threshold Tref1, thereby determining the heating power of the first heating component 70 and the wind speed of the fan 60 during the change from the current temperature to the first preset temperature threshold Tref1, thus improving the constant temperature control efficiency.
[0099] The PID algorithm includes a proportional parameter Kp, an integral parameter Ki, and a derivative parameter Kd. Kp represents the range within which the proportional action is performed above and below a first temperature threshold. The higher the temperature T1 of the circulation loop 50, the lower the power of the first heating component 70; the lower the temperature T1 of the circulation loop 50, the higher the power of the first heating component 70. Ki is also a proportional parameter, representing the inverse relationship between the cumulative value of the temperature deviation between the temperature T1 of the circulation loop 50 and the first preset temperature threshold Tref1 and a set value. For example, when the temperature deviation between the temperature T1 of the circulation loop 50 and the first preset temperature threshold Tref1 is large, the change in power of the first heating component 70 is increased to quickly increase the power of the first heating component 70. Kd is the ratio of the rate of temperature change to the power of the first heating component 70. That is, when the temperature rises too quickly, the power of the first heating component 70 is reduced to prevent the temperature T1 of the circulation loop 50 from rising too quickly; conversely, when the temperature drops too quickly, the power of the first heating component 70 is increased to prevent the temperature of the circulation loop 50 from dropping too quickly.
[0100] Meanwhile, to adapt to different system states of the electronic pressure controller 100, such as high temperature or low temperature, the electronic control board 90 initially determines the current system state of the electronic pressure controller 100 by detecting the temperature T1 of the circulating return path 50. For example, when the detected temperature T1 of the circulating return path 50 reaches 60°C, it is determined that the current state is high temperature; or when the detected temperature T1 of the circulating return path 50 reaches -10°C, it indicates that the current state is low temperature. Based on different system states, the electronic control board 90 further calculates the magnitudes of the proportional parameter Kp, integral parameter Ki, and derivative parameter Kd required for the PID algorithm, and then calculates the determined values. The proportional parameter Kp, integral parameter Ki, and derivative parameter Kd are substituted into the PID algorithm. Based on the recalculated PID algorithm, PID adjustment is performed to finally determine the heating power of the first heating component 70 and / or the wind speed of the fan 60. The electronic control board 90 is also equipped with corresponding heating drive circuits and fan drive circuits. Based on the determined heating power of the first heating component 70 and / or the wind speed of the fan 60, the electronic control board 90 controls the heating drive circuits and fan drive circuits to work, thereby controlling the first heating component 70 to heat according to the determined heating power and controlling the fan 60 to rotate according to the determined wind speed, so as to achieve constant temperature control under different system states.
[0101] For example, assuming the first preset temperature threshold Tref1 ranges from 20℃ to 40℃, when the temperature T1 of the circulating return path 50 is detected to reach -10℃, it indicates that the current state is low temperature. At this time, the electronic control board 90 calculates that the proportional parameter Kp, integral parameter Ki, and derivative parameter Kd of the PID algorithm are 5, 5, and 5, respectively, which correspond to the initial power of the first heating component 70 being 30W and the wind speed being 10m / s. During the heating process, the power and wind speed change accordingly based on the temperature change obtained from the feedback.
[0102] When the temperature T1 of the circulating return path 50 is detected to reach -30℃, it indicates that the current state is low temperature. At this time, the electronic control board 90 calculates that the proportional parameter Kp, integral parameter Ki, and derivative parameter Kd of the PID algorithm are 10, 10, and 10, respectively. The power of the first heating component 70 is 60W and the wind speed is 20m / s. During the heating process, the power and wind speed change accordingly based on the temperature change feedback.
[0103] That is, when a lower temperature is detected, greater power and a fan of 60 are needed to achieve heating, thereby achieving rapid heating.
[0104] Correspondingly, the fan 60 and the first heating component 70 operate in different states under different temperatures. Specifically, in an optional embodiment, when the temperature T1 of the circulation return path 50 is lower than the first preset temperature threshold Tref1, the electronic control board 90 controls the fan 60 to rotate at a preset wind speed and controls the first heating component 70 to heat at a preset power.
[0105] When the temperature T1 of the circulation path 50 is higher than the first preset temperature threshold Tref1, the electronic control board 90 controls the fan 60 to rotate at a preset wind speed and controls the first heating component 70 to stop rotating.
[0106] In this embodiment, when the temperature exceeds the first preset temperature threshold Tref1, the electronic control board 90 further determines whether the temperature T1 of the circulation return path 50, i.e., the ambient temperature of the pressure sensor 40, is relatively low or high. When the temperature T1 of the circulation return path 50 is detected to be lower than the first preset temperature threshold Tref1, it indicates that the ambient temperature of the pressure sensor 40 is relatively low and temperature control is required to reach the first preset temperature threshold Tref1. The electronic control board 90 controls the fan 60 to rotate at a preset wind speed through the fan drive circuit and controls the first heating component 70 to heat through the heating drive circuit, so that the temperature in the circulation return path 50 rises. When the temperature T1 of the circulation return path 50 reaches the first preset temperature threshold Tref1, the fan 60 and the first heating component 70 are controlled to stop working.
[0107] Conversely, when the temperature T1 of the circulating return path 50 is detected to be higher than the first preset temperature threshold Tref1, it indicates that the ambient temperature of the pressure sensor 40 is relatively high and cooling control is required to reach the first preset temperature threshold Tref1. The electronic control board 90 controls the fan 60 to rotate at a preset wind speed through the fan drive circuit, so that the temperature in the circulating return path 50 drops. When the temperature T1 of the circulating return path 50 reaches the first preset temperature threshold Tref1, the fan 60 and the first heating component 70 are controlled to stop working.
[0108] The pressure sensor 40 can be a conventional pressure sensor. The pressure sensor 40 has corresponding pressure detection points and pressure-sensitive devices 42 set at those pressure detection points. The pressure-sensitive device 42 is used for pressure detection in the pipeline. To achieve internal temperature control of the pressure-sensitive device 42 and the pressure sensor 40, so that the pressure-sensitive device 42 operates at a target temperature, further, such as... Figure 7 and Figure 8 As shown, the pressure sensor 40 includes:
[0109] The second temperature sensor 41 is connected to the electronic control board 90. The second temperature sensor 41 is used to detect the internal temperature of the pressure sensor 40 and output a second temperature signal.
[0110] Pressure-sensitive device 42 is connected to electronic control board 90. Pressure-sensitive device 42 is set with pressure detection point corresponding to pressure sensor 40. Pressure detection point is set with corresponding pipeline 23. Pressure-sensitive device 42 detects pressure in pipeline 23 through pressure detection point.
[0111] Heating film 43 is connected to electronic control board 90;
[0112] The electronic control board 90 is also used for:
[0113] The second temperature signal is acquired, and the heating film 43 is controlled to heat or stop heating according to the second temperature signal, so as to adjust the internal temperature of the pressure sensor 40 within the second preset temperature threshold.
[0114] In this embodiment, the operating temperature of the pressure-sensitive device 42 is mainly affected by the temperature T1 of the circulation return path 50. The electronic control board 90 can ensure that the operating temperature of the pressure-sensitive device 42 is within the first preset temperature threshold Tref1 by detecting the temperature T1 of the circulation return path 50 and controlling the operation of the first heating component 70 and the fan 60.
[0115] Meanwhile, since the pressure sensor 40 also contains components and circuits for pressure signal conversion, these components and circuits experience temperature drift at different operating temperatures, which can also affect the accuracy of pressure detection and control. Therefore, the pressure sensor 40 also contains a second temperature sensor 41 and a heating film 43. The pressure-sensitive device 42, the second temperature sensor 41, and the heating film 43 are respectively connected to the electronic control board 90. While keeping the operating temperature of the pressure-sensitive device 42 within the first preset temperature threshold Tref1, the electronic control board 90 further controls the heating film 43 to perform corresponding heating based on the temperature detected by the second temperature sensor 41, and balances the internal temperature of the pressure sensor 40 within the second preset temperature threshold through temperature feedback.
[0116] The temperature range and magnitude of the first temperature threshold and the temperature range and magnitude of the second preset temperature threshold can be the same or different, depending on the specific settings of the pressure-sensitive device 42 and the operating temperature of each component.
[0117] The second temperature sensor 41 can be placed near or attached to the pressure-sensitive device 42 to detect the temperature of the pressure-sensitive device 42. Similarly, the heating film 43 can be placed near or attached to the pressure-sensitive device 42 to control the temperature of the pressure-sensitive device 42. The specific setting method is not limited.
[0118] Furthermore, to simplify the internal structure of the pressure sensor and avoid misalignment of components, in an optional embodiment, such as Figure 8 and Figure 9 As shown, the pressure sensor 40 also includes:
[0119] The circuit board 45 includes a first side and a second side disposed opposite to each other. The second temperature sensor 41 and the pressure-sensitive device 42 are disposed on the first side of the circuit board 45. The circuit board 45 is also connected to the electronic control board 90.
[0120] The heating film 43 is arranged side by side with the circuit board 45 at intervals, and the heating film 43 is located on one side of the first side of the circuit board 45.
[0121] In this embodiment, the second temperature sensor 41 and the pressure-sensitive device 42 are mounted on the circuit board by welding, installation, or other means. The circuit board 45 is provided with corresponding signal ports. The second temperature sensor 41 and the pressure-sensitive device 42 are connected to the electronic control board 90 through the circuit board 45 and the signal interface. The heating film 43 can be directly attached to the circuit board 52 or set separately from the circuit board 52. In order to facilitate temperature control of the entire internal temperature of the pressure sensor 40, the heating film 43 is set side by side with the circuit board 45 at intervals and facing the second temperature sensor 41 and the pressure-sensitive device 42. When the heating film 43 is heated, the heat generated is directly released to the components on the circuit board 52 and the second temperature sensor 41. The second temperature sensor 41 can directly detect the current internal temperature change of the pressure sensor 40. Similarly, the components on the circuit board 52 can be directly heated, improving the heating efficiency.
[0122] Among them, such as Figure 9 As shown, the pressure sensor 40 also includes a housing, which includes a first housing 441 and a second housing 442 that are adapted to fit the housing. The housing completely encloses the heating film 43 and the circuit board 52, forming a relatively sealed space. The heating film 43 is located between the first housing 441 and the circuit board 45. The first housing 441 is provided with a through hole 4411, which constitutes the pressure detection point of the pressure sensor 40. The end of the pressure-sensitive device 42 is positioned relative to the through hole 4411 and performs pressure detection on the pipeline 23 when the pressure sensor 40 is installed on the pipeline 23. In order to facilitate the extension of the end of the pressure-sensitive device 42 to the through hole 4411 through the heating film 43 and to avoid the heating film 43 from heating the pressure-sensitive device 42 and affecting its ambient temperature, the size of the heating film 43 can be smaller than or the same as the size of the circuit board and have corresponding openings. In an optional embodiment, such as Figure 8 As shown, the heating film 43 is also provided with a first opening 431, and the end of the pressure sensitive device 42 extends through the first opening 431 of the heating film 43 to the pipe 23.
[0123] By setting the first opening 431, the end of the pressure-sensitive device 42 can extend to the position of the through hole 4411. At the same time, it can ensure that the heating film 43 matches the size of the circuit board 45 to the greatest extent, avoiding the problem of low heating efficiency caused by the heating film 43 being too small, thus improving heating efficiency. Furthermore, when the heating film 43 heats, it only heats the components on the circuit board 52 and does not affect the pressure-sensitive device 42. The temperature of the pressure-sensitive device 42 is determined by the circulation return path 50. The size of the first opening 431 is determined based on the size of the pressure-sensitive device 42, and the size of the through hole 4411 is determined based on the size of the end of the pressure-sensitive device 42.
[0124] The heating film 43 can be a PI heating film, a polyimide heating film, a PET heating film, a silicone heating sheet, an electric heating sheet, or other structures.
[0125] In this embodiment, the heating film 43 may shift inside the pressure sensor, leading to unstable heating. To achieve stable heating, in an optional embodiment, such as... Figure 9 and Figure 10 As shown, the pressure sensor 40 also includes:
[0126] The heating film 43 is laid flat on the substrate 46. The substrate 46 and the circuit board 45 are arranged side by side with intervals. A second opening 461 is provided on the substrate 46 corresponding to the first opening 431 of the heating film 43. The end of the pressure sensitive device 42 extends through the second opening 461 of the substrate 46 to the pipe 23.
[0127] In this embodiment, the first housing 441, the substrate 46, the circuit board 52, and the second housing 442 are arranged sequentially. In order to facilitate the extension of the end of the pressure-sensitive device 42 to the through hole 4411 through the heating film 43, the substrate 46 is provided with a second opening 461. The size of the second opening 461 can be equal to the size of the first opening 431. After the pressure sensor 40 is assembled, the end of the pressure-sensitive device 42 extends from the second opening 461 to the through hole 4411 of the first housing 441. The heating film 43 can be fixedly installed on the substrate 46 to prevent the heating film 43 from shifting and to achieve the purpose of stable heating of the heating film 43. At the same time, the substrate 46 can also play an isolation role to isolate and protect the circuit board 45.
[0128] The substrate 46 can be a carrier board, PCB board, or other structures.
[0129] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The above-mentioned electronic pressure controller 100 includes a housing 10, an inlet 21, an outlet 22, a pipeline 23, a pressure regulating valve 30, and a temperature control module disposed in the housing 10. The temperature control module includes a fan 60, a first heating component 70, a pressure sensor 40, and a first temperature sensor 80. The fan 60, the first heating component 70, the pressure sensor 40, and the first temperature sensor 80 are sequentially and spaced apart in a circulating return path that allows air to circulate. The electronic control board 90 determines the current ambient temperature of the pressure sensor 40 through the first temperature signal fed back by the first temperature sensor 80, and controls the first heating component 70 and the fan 60 to work accordingly, thereby realizing the regulation and control of the ambient temperature of the pressure sensor 40, so that the ambient temperature of the pressure sensor 40 is maintained within the first preset temperature threshold Tref1, reducing the impact of temperature changes on the pressure sensor 40, and improving the accuracy of pressure detection and control. The electronic control board 90 is also used to adjust the opening degree of the pressure regulating valve 30 according to the pressure signal obtained by the pressure sensor 40, thereby adjusting the pressure of the pipeline 23 within the preset pressure threshold and realizing the pressure control function.
[0130] The present invention also proposes a gas chromatograph, which includes an electronic pressure controller 100. The specific structure of the electronic pressure controller 100 is as described in the above embodiments. Since the gas chromatograph adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0131] A gas chromatograph is an instrument that uses chromatographic separation and detection techniques to perform qualitative and quantitative analysis on complex mixtures of multiple components. A gas chromatograph may include a chromatographic column, a splitter, an electronic pressure controller 100, and a gas detector. The chromatographic column is connected to the splitter, the gas detector is connected to the splitter, and the electronic pressure controller 100 is connected to the splitter. After the sample is injected into the chromatographic column for separation, it is then delivered to the splitter. Under the action of the electronic pressure controller 100, the splitter divides the separated sample into at least two streams, which are then delivered to the corresponding gas detectors for detection.
[0132] The electronic pressure controller 100 is used as a basic configuration in gas chromatographs. The measured medium is gas. It adopts automatic control technology to ensure the stability of gas path pressure / flow, thereby providing more reliable and complete support for the reproduction, optimization and automation of chromatographic conditions.
[0133] This invention also proposes an adjustment and control method for an electronic pressure controller 100, applied to the aforementioned electronic pressure controller, such as... Figure 11 As shown, the adjustment and control method of the electronic pressure controller 100 includes the following steps:
[0134] S10: Obtain the temperature of the circulation return path 50 and the pressure of the pipeline 23.
[0135] The circulation return path 50 is provided with a fan 60, a first heating component 70, a pressure sensor 40 and a first temperature sensor 80 at intervals. The temperature of the circulation return path 50 can be obtained through the first temperature sensor 80, and the pressure of the pipeline 23 can be obtained through the pressure sensor 40.
[0136] S20. Control the fan 60 to rotate or stop rotating according to the temperature of the circulation path 50, and / or control the first heating component 70 to heat or stop heating, so as to adjust the temperature of the circulation path 50 to within the first preset temperature threshold.
[0137] Due to the influence of different external environments on the electronic pressure controller 100, such as the different positions of the measured medium and external heating components, or their asymmetrical arrangement in the electronic pressure controller 100, the temperature in the circulation loop 50 may be unbalanced in the initial power-on state, resulting in a problem of high temperature on one side and low temperature on the other side, causing a temperature difference. This may lead to a temperature difference between the internal pressure sensor 40 and the first temperature sensor 80. To avoid this situation, when the electronic pressure controller 100 is powered on, it first outputs a fan 60 control signal to control the fan 60 to rotate, so that the air in the circulation loop 50 circulates, thereby making the temperature T1 of the circulation loop 50 more uniform. Then, it acquires the first temperature signal detected by the first temperature sensor 80, improving the accuracy of temperature T1 detection in the circulation loop 50.
[0138] Then, the temperature in the current circulation loop 50 is obtained through the first temperature sensor 80 and compared with the first preset temperature threshold Tref1. The first preset temperature threshold Tref1 can be set to a corresponding temperature range, for example, the first preset temperature threshold Tref1 is set to 20℃~40℃. It is determined whether the current temperature T1 of the circulation loop 50, i.e. the current ambient temperature of the pressure sensor 40, has reached the first preset temperature threshold Tref1. If necessary, the fan 60 is restarted and / or the first heating component 70 is controlled to work again to achieve heating or cooling, so that the temperature T1 of the circulation loop 50 is balanced to the first preset temperature threshold Tref1.
[0139] S30. Adjust the opening degree of the pressure regulating valve 30 according to the pressure of the pipeline 23, so as to adjust the pressure of the pipeline 23 within the preset pressure threshold.
[0140] When the ambient temperature of the pressure sensor 40 reaches the first preset temperature threshold Tref1, that is, when the pressure sensor 40 is operating at the set temperature, the pressure control module then performs its control operation. Specifically, the pressure sensor 40 detects the current pressure data of the pipeline 23 and compares the pressure data with the internally stored preset pressure threshold. The control algorithm then adjusts the opening and closing degree of the pressure regulating valve 30 so that the pressure in the pipeline 23 reaches the preset pressure threshold.
[0141] The electronic pressure controller 100 operates in different states, resulting in varying heat generation from its operating power. Consequently, the overall system of the electronic pressure controller 100 experiences different system states due to these different operating conditions, affecting the temperature T1 of the internal circulation loop 50 differently. Therefore, using constant fan speed or constant heating power for temperature control leads to inefficiencies and low temperature control efficiency. To improve temperature control efficiency, in an optional embodiment, such as... Figure 12 As shown, step S20 includes:
[0142] The temperature T1 of the circulation path 50 is compared with the first preset temperature threshold Tref1;
[0143] When the temperature T1 of the circulation path 50 is within the first preset temperature threshold Tref1, control the fan 60 to stop rotating and control the first heating component 70 to stop heating.
[0144] When the temperature T1 of the circulation loop 50 exceeds the first preset temperature threshold Tref1, the parameters of the PID algorithm are calculated and determined based on the temperature T1 of the circulation loop 50.
[0145] Based on the determined parameters of the PID algorithm, the temperature of the circulation loop 50, and the first preset temperature threshold Tref1, PID adjustment is performed to determine the fan speed of the fan 60 and / or adjust the heating power of the first heating component 70.
[0146] In this embodiment, the detected temperature T1 of the circulation return path 50 is first compared with the first preset temperature threshold Tref1 to determine whether it is within the first preset temperature threshold Tref1. When the detected temperature T1 of the circulation return path 50 is within the first preset temperature threshold Tref1, it indicates that there is no need to perform heating or cooling control at present, and the current temperature can meet the working temperature of the pressure sensor 40. At this time, the fan 60 is controlled to stop rotating and the first heating component 70 is controlled to stop heating.
[0147] When the temperature T1 of the circulating return path 50 is detected to exceed the first preset temperature threshold Tref1, it indicates that an overheating or underheating situation has occurred and temperature control is required. Based on the PID algorithm, the first heating component 70 and the fan 60 are controlled to achieve constant temperature control of the current circulating return temperature.
[0148] Specifically, such as Figure 3 As shown, PID adjustment is performed based on the PID algorithm, the detected temperature T1 of the circulating return path 50, and the first preset temperature threshold Tref1, thereby determining the heating power of the first heating component 70 and the wind speed of the fan 60 during the change from the current temperature to the first preset temperature threshold Tref1, thus improving the efficiency of constant temperature control.
[0149] The PID algorithm includes a proportional parameter Kp, an integral parameter Ki, and a derivative parameter Kd. Kp represents the range within which the proportional action is performed above and below a first temperature threshold. The higher the temperature T1 of the circulation loop 50, the lower the power of the first heating component 70; the lower the temperature T1 of the circulation loop 50, the higher the power of the first heating component 70. Ki is also a proportional parameter, representing the inverse relationship between the cumulative value of the temperature deviation between the temperature T1 of the circulation loop 50 and the first preset temperature threshold Tref1 and a set value. For example, when the temperature deviation between the temperature T1 of the circulation loop 50 and the first preset temperature threshold Tref1 is large, the change in power of the first heating component 70 is increased to quickly increase the power of the first heating component 70. Kd is the ratio of the rate of temperature change to the power of the first heating component 70. That is, when the temperature rises too quickly, the power of the first heating component 70 is reduced to prevent the temperature T1 of the circulation loop 50 from rising too quickly; conversely, when the temperature drops too quickly, the power of the first heating component 70 is increased to prevent the temperature of the circulation loop 50 from dropping too quickly.
[0150] Meanwhile, to adapt to different system states of the electronic pressure controller 100, such as high temperature or low temperature, the current system state of the electronic pressure controller 100 is initially determined by the detected temperature T1 of the circulating return path 50. For example, when the detected temperature T1 of the circulating return path 50 reaches 60℃, it is determined that the current state is high temperature; or when the detected temperature T1 of the circulating return path 50 reaches -10℃, it indicates that the current state is low temperature. Based on different system states, the magnitudes of the proportional parameter Kp, integral parameter Ki, and derivative parameter Kd required for the PID algorithm are further calculated. The determined proportional parameter Kp, integral parameter Ki, and derivative parameter Kd are then substituted into the PID algorithm. Based on the recalculated PID algorithm, PID adjustment is performed to finally determine the heating power of the first heating component 70 and / or the wind speed of the fan 60. The corresponding heating drive circuit and fan drive circuit are then controlled to operate, thereby controlling the first heating component 70 to heat according to the determined heating power and controlling the fan 60 to rotate according to the determined wind speed, achieving constant temperature control under different system states and improving the efficiency of constant temperature control.
[0151] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.
Claims
1. An electronic pressure controller, characterized in that, include: The housing includes an inlet and an outlet for the measured medium to enter and exit, and a conduit connecting the inlet and the outlet for the flow of the measured medium. A pressure regulating valve and a pressure sensor are sequentially installed on the pipeline. The pressure sensor is used to detect the pressure of the pipeline and output a pressure signal. The temperature control module is disposed within the housing. The temperature control module includes a fan, a first heating component, and a first temperature sensor. The fan, the first heating component, the pressure sensor, and the first temperature sensor are sequentially and spaced apart in a circulating return path that allows air to circulate. The first temperature sensor is used to detect the temperature of the circulating return path and output a first temperature signal. An electronic control board is disposed within the housing. The electronic control board is connected to the pressure regulating valve, the fan, the first heating assembly, the first temperature sensor, and the pressure sensor, respectively. The electronic control board is used for: The fan is controlled to rotate or stop rotating according to the first temperature signal, and / or the first heating component is controlled to heat or stop heating, so as to adjust the temperature of the circulation return path within a first preset temperature threshold. And adjust the opening degree of the pressure regulating valve according to the pressure signal to regulate the pressure of the pipeline within a preset pressure threshold.
2. The electronic pressure controller as described in claim 1, characterized in that, The electronic control board is specifically used for: The temperature of the circulation return path is determined based on the first temperature signal, and the temperature of the circulation return path is compared with the first preset temperature threshold. When the temperature of the circulating return path is within the first preset temperature threshold, the fan is controlled to stop rotating and the first heating component is controlled to stop heating. When the temperature of the circulating return path exceeds the first preset temperature threshold, the parameters of the PID algorithm are calculated and determined based on the temperature of the circulating return path. PID adjustment is performed based on the determined parameters of the PID algorithm, the temperature of the circulating return path, and the first preset temperature threshold to determine the fan speed and / or adjust the heating power of the first heating component.
3. The electronic pressure controller as described in claim 2, characterized in that, When the temperature of the circulating return path is lower than the first preset temperature threshold, the electronic control board controls the fan to rotate at a preset wind speed and controls the first heating component to heat at a preset power. When the temperature of the circulating return path is higher than the first preset temperature threshold, the electronic control board controls the fan to rotate at a preset wind speed and controls the first heating component to stop heating.
4. The electronic pressure controller as described in claim 1, characterized in that, The pressure sensor includes: The second temperature sensor is connected to the electronic control board. The second temperature sensor is used to detect the internal temperature of the pressure sensor and output a second temperature signal. A pressure-sensitive device is connected to the electronic control board. The pressure-sensitive device is set with a pressure detection point corresponding to the pressure sensor. The pressure detection point is used to correspond to the pipeline. The pressure-sensitive device detects the pressure of the pipeline through the pressure detection point. The heating film is connected to the electronic control board; The electronic control board is also used for: The second temperature signal is acquired, and the heating film is controlled to heat or stop heating according to the second temperature signal, so as to adjust the internal temperature of the pressure sensor to within the second preset temperature threshold.
5. The electronic pressure controller as described in claim 4, characterized in that, The pressure sensor also includes: The circuit board includes a first side and a second side disposed opposite to each other, the second temperature sensor and the pressure-sensitive device are disposed on the first side of the circuit board, and the circuit board is also connected to the electronic control board; The heating film is arranged side by side with the circuit board at a distance, and the heating film is located on one side of the first side of the circuit board.
6. The electronic pressure controller as described in claim 5, characterized in that, The heating film is also provided with a first opening, and the end of the pressure-sensitive device extends through the first opening of the heating film to the pipeline.
7. The electronic pressure controller as described in claim 5, characterized in that, The pressure sensor also includes: The substrate has the heating film laid flat on it, and the substrate and the circuit board are arranged side by side with a gap. A second opening is provided on the substrate corresponding to the first opening of the heating film, and the end of the pressure-sensitive device extends through the second opening of the substrate to the pipeline.
8. The electronic pressure controller as described in claim 1, characterized in that, The housing also has a receiving cavity, and the electronic control board and the circulation return path are disposed in the receiving cavity.
9. The electronic pressure controller as described in claim 1, characterized in that, The first heating component is a heating wire.
10. A gas chromatograph, characterized in that, Includes the electronic pressure controller as described in any one of claims 1 to 9.
11. A method for regulating and controlling an electronic pressure controller, applied to the electronic pressure controller as described in any one of claims 1 to 9, characterized in that, The adjustment and control method of the electronic pressure controller includes: Obtain the temperature of the circulation return path and the pressure of the pipeline; The fan is controlled to rotate or stop rotating based on the temperature of the circulating return path, and / or the first heating component is controlled to heat or stop heating, so as to adjust the temperature of the circulating return path within a first preset temperature threshold. The opening and closing degree of the pressure regulating valve is adjusted according to the pressure in the pipeline to regulate the pressure in the pipeline within a preset pressure threshold.
12. The adjustment and control method of the electronic pressure controller as described in claim 11, characterized in that, The step of controlling the fan to rotate or stop rotating based on the temperature of the circulating return path, and / or controlling the first heating component to heat or stop heating, includes: Compare the temperature of the circulating return path with the first preset temperature threshold. When the temperature of the circulating return path is within the first preset temperature threshold, the fan is controlled to stop rotating and the first heating component is controlled to stop heating. When the temperature of the circulating return path exceeds the first preset temperature threshold, the parameters of the PID algorithm are calculated and determined based on the temperature of the circulating return path. PID adjustment is performed based on the determined parameters of the PID algorithm, the temperature of the circulating return path, and the first preset temperature threshold to determine the fan speed and / or adjust the heating power of the first heating component.