A pressure regulating mechanism and condensation control system for volatile phenol flow path

Abstract

The present invention is applicable to the field of flow injection analysis and provides a pressure regulating mechanism and condensation control system for a volatile phenol flow path, comprising a condensation assembly and a pressure regulating mechanism. The condensation assembly comprises an isothermal body for maintaining a low temperature and a cold liquid auxiliary piping system for pre-cooling, the isothermal body being wrapped with piping for accommodating the sample to be cooled. The pressure regulating mechanism comprises a flow path plate assembly driven by a motor and capable of angle adjustment. Thus, by providing a unique condensation assembly and pressure regulating mechanism, the device can effectively control the condensation process and pressure balance during the detection of volatile phenol samples, thereby improving the accuracy and reliability of the detection results. The device is suitable for use in automatic volatile phenol analyzers based on flow injection analysis, and has significant advantages in applications requiring high-precision detection of volatile phenol samples.

Description

Technical Field

[0001] The invention is applicable to the field of flow injection analysis and provides a pressure regulating mechanism and a condensation control system for a volatile phenol flow path. Background Art

[0002] The volatile phenol automatic analyzer is an instrument used to measure the volatile phenol content in water. Its function is to realize the rapid, accurate and automatic detection of volatile phenol in water. It is widely used in municipal sewage, industrial wastewater, surface water, groundwater, drinking water and other fields.

[0003] In flow injection testing of volatile phenols, phenol vapor must be cooled and condensed into a liquid, which is then pumped to the next reactor via a pump tube. Existing flow injection condensation devices often use a single semiconductor refrigeration chip, resulting in low cooling efficiency. Furthermore, existing devices employ open-loop control. Without steam transport, condensation mist or even ice crystals form at the cold end, causing blockages or increased pressure within the pipeline, impacting normal flow. Currently, no existing technology addresses this issue. Summary of the Invention

[0004] To address the aforementioned drawbacks, the present invention aims to provide a pressure regulation mechanism and condensation control system for a volatile phenol flow path, addressing the issues raised in the background art. The system comprises a condensation assembly and a pressure regulation mechanism. The condensation assembly includes an isothermal body for maintaining a low temperature and a cold liquid auxiliary piping system for pre-cooling. The isothermal body is wrapped with piping for accommodating the sample to be cooled. The pressure regulation mechanism includes a flow path plate assembly driven by a motor and capable of angle adjustment.

[0005] Furthermore, a temperature monitoring device is installed in the isothermal body.

[0006] Furthermore, the pressure regulating mechanism also includes a rotating shaft, a flow path plate, a pressure sensor and a driving motor for driving the flow path plate to rotate around the rotating shaft; the flow path plate assembly is installed on the flow path plate.

[0007] Furthermore, the flow path plate has a rotation angle range of 0-15°.

[0008] Furthermore, a fixing portion configured for the flow path plate is installed inside the automatic analyzer, and an insert strip is passed through the fixing portion. When the driving motor drives the flow path plate to rotate until it is flush with the horizontal plane, the flow path plate can be fixed to the automatic analyzer through the insert strip.

[0009] Furthermore, a cooling liquid channel is provided inside the flow plate assembly, and cooling liquid pipes are installed at both ends of the flow plate assembly through fastening nuts; the cooling liquid auxiliary pipeline system includes several flow plate assemblies connected to each other through cooling liquid pipes.

[0010] Furthermore, a cooling liquid cavity for holding cooling liquid is provided inside the isothermal body; the liquid auxiliary pipeline system includes a driving pump for driving the flow of internal liquid, and both ends of the cooling liquid auxiliary pipeline system are connected to the cooling liquid cavity inside the isothermal body.

[0011] Furthermore, the condensing assembly also includes a heat dissipation fin installed on the isothermal body, a semiconductor refrigeration fin is installed between the heat dissipation fin and the isothermal body, and a fan is installed on the heat dissipation fin.

[0012] Furthermore, the system also includes a power supply and a microcontroller. The microcontroller is connected to the temperature sensor and the pressure sensor through an ADC, receives analog signals from the temperature sensor and the pressure sensor, and outputs actions to drive the fan and the motor.

[0013] Therefore, the beneficial effects of the present invention are:

[0014] The system's condensing structure uses dual semiconductor refrigeration and dual fans for heat dissipation, resulting in higher cooling power density and a smaller cooling box. The circuit drive uses a constant current method to drive the refrigeration plate, which significantly reduces circuit EMI at high power. The software control uses a PID algorithm, which can better achieve the target constant temperature setting. At the same time, the system has a maximum power of 80W, and the temperature stability performance is better when transporting condensation blocks at 165°C high-temperature water vapor. It can adjust the reaction faster according to the temperature of the condensation block. At the same time, the present invention combines the adjustment of the angle of the volatile phenol reaction flow plate to adjust the pipeline pressure, which can better improve the efficiency of the chemical reaction in the tube, thereby improving the accuracy of product detection.

[0015] By setting up a unique condensation component and pressure regulation mechanism, the condensation link control and pressure balance control in the volatile phenol sample detection process can be effectively realized, thereby improving the accuracy and reliability of the detection results. It is suitable for volatile phenol automatic analyzers based on flow injection analysis, and has significant advantages especially in situations where high-precision detection of volatile phenol samples is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the control flow chart of the refrigeration component;

[0017] Figure 2 Schematic diagram of the refrigeration component structure;

[0018] Figure 3 This is a top view of the volatile phenol automatic analyzer;

[0019] Figure 4 for Figure 3 AA direction cross section;

[0020] Figure 5 It is a structural cross-sectional view of the flow path plate assembly;

[0021] Figure 6 It is a schematic diagram of the combined structure of the flow path plate assembly;

[0022] Figure 7 for Figure 3 A magnified diagram of the structure of part B;

[0023] In the figure: 01-condensing assembly; 1-fan; 2-heat sink fins; 3-semiconductor refrigeration plate; 4-support base; 5-isothermal body; 6-mounting base; 10-flow path plate assembly; 101-cold liquid flow channel; 102-fastening nut; 103-cold liquid pipe; 11-driving motor; 12-rotating shaft; 13-fixing part; 131-insert strip; 14-shaft mounting plate; 15-flow path plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] It should be noted that, in the description of the present invention, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Furthermore, in the description of the present invention, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] See also Figure 1-5The purpose of the present invention is to provide a pressure regulating mechanism and a condensation control system for a volatile phenol flow path. The system is based on flow injection analysis (FIA) to quickly and efficiently detect the chemical components in liquid samples.

[0029] The basic principle is: a certain amount of sample is injected into a continuously flowing, excess carrier fluid. The sample is carried by the carrier fluid through the reaction device and the detection device, and is detected after chemical reaction or physical action occurs. Finally, the content of the substance is determined based on the intensity and characteristics of the detection signal.

[0030] The entire carrier flow, reaction, and detection process is performed using a commonly available automated volatile phenol analyzer, which includes a sampling system responsible for sample handling. A peristaltic pump in this system extracts a specific amount of water sample from each sampling point and injects it quantitatively into the carrier flow through an injection valve.

[0031] After each water sample enters the carrier fluid, the two are mixed and reacted in a specific reaction tube or reaction coil. During this process, a color developer can be added to generate a colored complex or derivative of the substance to be tested. The color of the solution after color development is proportional to the concentration of the substance to be tested in the solution, that is, the chemical reaction generates a colored substance with a specific absorbance, or the physical effect causes the properties of the sample to change for subsequent detection. Finally, the color-developed solution enters a detector, such as an optical detector such as a spectrophotometer. The detector converts the detection signal into an electrical signal based on its intensity and characteristics. The data processing system processes and analyzes the electrical signal, including data correction, calculation, storage, display and other operations, and ultimately derives the concentration or content of the substance to be tested, and outputs the measurement results and report.

[0032] The above process includes a gas condensation step, that is, when detecting volatile phenol samples, the phenol-containing vapor needs to be cooled and condensed into a liquid to facilitate subsequent pumping and transportation to the reaction device for analysis.

[0033] That is, the pressure regulating mechanism and condensation control system for the volatile phenol flow path proposed in this solution include a condensation component 01 and a pressure regulating mechanism.

[0034] Condensation assembly 01 includes an isothermal body 5 for maintaining a low temperature and a cold liquid auxiliary piping system for pre-cooling. Specifically, condensation assembly 01 comprises a fan 1, heat sink fins 2, semiconductor cooling fins 3, a support base 4, an isothermal body 5, a mounting base 6, and a housing. The pressure regulation mechanism includes a motor-driven flow path plate assembly 10 with adjustable angle.

[0035] The cooling surface of the semiconductor refrigeration plate 3 is in direct contact with the isothermal body 5, which is wrapped with a pipe for accommodating the sample to be cooled. The isothermal body 5 has a coolant cavity inside, which is filled with coolant. Specifically, the coolant is a fluid with a low freezing point. The design of the heat sink fins 2 increases the contact area with the air. The fan 1 is activated, accelerating the air flow, which lowers the temperature of the heat sink fins 2. The heat conduction through the semiconductor refrigeration plate 3 also lowers the temperature of the isothermal body 5. As a result, the phenol-containing vapor flowing through the pipe corresponding to the isothermal body 5, which contains the sample to be cooled, condenses into liquid and flows to the next reaction device.

[0036] The isothermal body 5 is equipped with a temperature monitoring and control device to maintain the temperature of the device constant.

[0037] The other side of the semiconductor refrigeration plate 3 contacts the heat dissipation fin 2, and the heat dissipation fin 2 is mounted on the isothermal body 5 by screws. A fan 1 is mounted on the heat dissipation fin 2, and the heat at the other end of the semiconductor refrigeration plate 3 is brought out through the fan 1 and the heat dissipation fin 2 to ensure the cooling effect of the semiconductor refrigeration plate 3.

[0038] The support base 4 is installed between the two heat dissipation fins 2. The condensing device is installed on the mounting base 6 through the support base 4. The outer shell covers the entire condensing device to prevent the temperature from losing too quickly.

[0039] At the same time, a vent is provided on the housing, and the vent is provided at the air outlet position of the fan 1, so that the heat brought out by the fan 1 is blown outside the condensing device to ensure the replacement of cold and hot air.

[0040] At the same time, a circuit board mounting position is provided on the upper end of the shell, making the entire structure modular and convenient for disassembly and assembly.

[0041] The circuit driver uses a constant current method to drive the cooling plate, which significantly reduces circuit EMI at high power.

[0042] The software control uses a PID algorithm to better achieve the target constant temperature setting. At the same time, the system has a maximum power of 80W and better temperature stability when transporting condensate blocks at 165℃ high-temperature steam. It can make faster response adjustments to the temperature of the condensate blocks.

[0043] The pressure regulating mechanism includes a flow path plate assembly 10 driven by a motor and capable of adjusting the angle. Specifically, a pressure regulating mechanism and condensation control system for a volatile phenol flow path also includes a flow path plate assembly 10 for auxiliary cooling of volatile phenol, a driving motor 11 for driving the flow path plate assembly 10 to rotate, a rotating shaft 12, a shaft mounting plate 14, a flow path plate 15 and a pressure sensor (not shown in the figure).

[0044] The flow path plate assembly 10 is a cylindrical metal rod, and the flow path plate assembly 10 is installed on the flow path plate 15 by snap-fitting; the drive motor 11 is fixed inside the instrument housing, and the output shaft of the motor is fixed to the flow path plate 15 by fasteners. When the drive motor 11 is working, the motor shaft drives the flow path plate 15 to rotate around the rotating shaft 12, adjusting the angle of the flow path plate 15 so that the flow path plate 15 can rotate within the angle range of 0-15°.

[0045] A pressure sensor is installed in the flow path. When the pressure sensor detects abnormal pressure within the pipe, it reports this abnormality to the system, which then operates the drive motor 11 based on the pressure conditions. By rotating the drive motor 11, the angle of the volatile phenol flow path plate 15 is adjusted. In an inclined pipe, the condensate surface shape and the effect of surface tension change. Compared to a vertical pipe, an inclined pipe allows the condensate film formed on the pipe wall to flow more continuously and evenly, reducing the risk of droplets dangling and accumulating on the pipe wall due to surface tension, forming blockages. This allows the condensate to be transported more smoothly, ultimately achieving the goal of regulating and balancing the pressure within the pipe.

[0046] Preferably, a fixing portion 13 is installed inside the automatic analyzer for use with the flow path plate 15. Inserts 131 are inserted into the fixing portion 13. When the drive motor 11 rotates the flow path plate 15 until it is flush with a horizontal surface, the inserts 131 secure the flow path plate 15 to the automatic analyzer, maintaining its stability.

[0047] Preferably, a cold liquid flow channel 101 is provided inside the flow path plate assembly 10, and cold liquid pipes 103 are installed at both ends of the flow path plate assembly 10 through fastening nuts 102. Several flow path plate assemblies 10 are connected to each other through the cold liquid pipes 103 to form a cold liquid auxiliary pipeline system. The cold liquid auxiliary pipeline system also includes a driving pump for driving the flow of internal liquid. The two ends (liquid inlet end and liquid outlet end) of the cold liquid auxiliary pipeline system are connected to the isothermal body 5, that is, they are connected to the cooling liquid cavity inside the isothermal body 5.

[0048] The cooling liquid auxiliary piping system is connected to the cooling liquid cavity inside the isothermal body 5. When the cooling liquid circulates in the cooling liquid auxiliary piping system, it can pre-absorb the heat of the liquid in the volatile phenol flow path. At the same time, since the flow path plate assembly 10 is located above the instrument, this process does not affect the experimenter's observation of the state of the liquid in the pipeline through the naked eye. For example, during the pre-condensation process, phenol-containing vapor exists in the corresponding pipeline as "disconnected bubbles". During this process, the cooling liquid auxiliary piping system absorbs heat. The bubble disconnection spacing in the corresponding spiral hose will become slightly smaller. At the same time, the liquid flow rate can be observed to infer the blockage inside the capillary hose in the reaction device. This process also synchronously accelerates the faster condensation effect of the volatile phenol flow path at the isothermal body 5 to prevent insufficient dissolution of the phenol-containing gas due to incomplete condensation, thereby achieving a more accurate analysis effect.

[0049] See attached Figure 1 The system also includes a power supply and a microcontroller. The microcontroller is connected to a temperature sensor and a pressure sensor via an ADC. It receives analog signals from these sensors and outputs commands to drive fan 1 and motor 11. Specifically, the power supply provides power to all components, maintaining system operation. The STM32F407 microcontroller serves as the system's core control unit. It is connected to a synchronous rectifier digital constant current circuit via a DAC (digital-to-analog converter) to send control signals to the system's internal circuits. The microcontroller is also connected to the temperature sensor via an ADC (analog-to-analog converter), receiving analog signals from the temperature sensor and converting them into digital signals for processing. The circuit receives control signals from the microcontroller and outputs commands to drive the fan and cooling plate (i.e., semiconductor cooling plate 3) to ensure they operate according to predetermined parameters. The temperature sensor monitors the temperature of the isothermal body 5 in real time and transmits this data to the microcontroller via the ADC, implementing closed-loop control. This ensures that the system adjusts the power of fan 1 based on the actual temperature to maintain a constant condensate block temperature.

[0050] To sum up, in actual use, the operator first installs the sample to be tested, extracts a certain amount of sample from each sampling point through the peristaltic pump in the injection system, and injects it quantitatively into the flow-carrying pipeline through the injection valve. The flow-carrying fluid carries the phenol-containing sample through the flow path plate assembly 10, the condensation assembly 01, the reaction device and the detection device in sequence.

[0051] During the entire process, the fan 1 of the condensing component 01 starts and accelerates the air flow, reducing the temperature of the heat dissipating fins 2. The semiconductor refrigeration plate 3 uses heat conduction to reduce the temperature of the isothermal body 5, and the coolant flowing through the corresponding pipeline of the isothermal body 5 is cooled, while the flow path plate assembly 10 is pre-cooled. The temperature monitoring and control device in the isothermal body 5 monitors and maintains the temperature of the device constant in real time.

[0052] At the same time, the flow path plate assembly 10 is driven by the drive motor 11 and can rotate around the rotating shaft 12 within an angle range of 0-15°. When the pressure sensor detects abnormal pressure in the pipe, it will feed back an abnormal signal to the system. The system controls the rotation of the drive motor according to the pressure conditions and adjusts the angle of the flow path plate 15 to allow the condensate to form a liquid film on the inner wall of the inclined pipe that is easier to flow continuously and evenly, reducing the situation of droplet suspension and accumulation blockage points, thereby adjusting the pressure in the pipe and achieving pressure balance in the pipe.

[0053] When the flow plate 15 is rotated to be flush with the horizontal plane, the fixing portion 13 inside the automatic analyzer can be fixed with the aid of the insert 131 to ensure that the flow plate 15 is stable. In addition, the pipeline system composed of the cold liquid flow channel 101, the cold liquid pipe 103, etc. in the cold liquid auxiliary pipeline system is connected to the cooling liquid cavity inside the isothermal body 5. During the circulation of the cooling liquid, the heat of the liquid in the volatile phenol flow path can be pre-absorbed, which does not affect the experimenter's observation of the liquid state in the pipeline, and can accelerate the condensation effect of the volatile phenol flow path at the isothermal body 5, thereby preventing inaccurate analysis caused by insufficient dissolution of the phenol-containing gas.

[0054] The system circuit drives fan 1 and the cooling fins based on control signals from the microcontroller, ensuring they operate within predefined parameters. A temperature sensor monitors the temperature of isothermal body 5 in real time and provides feedback to the microcontroller via the ADC, implementing closed-loop control. Fan 1's power is adjusted based on the actual temperature, maintaining a constant condensate block temperature and a high structural power-to-volume density. Furthermore, the system can set a target constant temperature (the target condensation temperature for volatile phenols is set between 5°C and 25°C). The circuit also reduces EMI and offers advantages such as interference-free operation even at high power output.

[0055] Therefore, the present invention can effectively realize the condensation link control and pressure balance control in the volatile phenol sample detection process by setting up a unique condensation component and pressure regulation mechanism, thereby improving the accuracy and reliability of the detection results. It is suitable for volatile phenol automatic analyzers based on flow injection analysis, and has significant advantages in occasions where high-precision detection of volatile phenol samples is required.

[0056] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A pressure regulating mechanism and condensation control system for a volatile phenol flow path, characterized in that: It comprises an automatic analyzer, wherein a condensation component (01) and a pressure regulating mechanism are provided inside the automatic analyzer; The condensation assembly (01) includes an isothermal body (5) for maintaining low temperature and a cold liquid auxiliary pipeline system for pre-cooling, and a pipeline for accommodating a sample to be cooled is wound around the isothermal body (5); the pressure regulating mechanism includes a flow path plate assembly (10) driven by a motor and capable of being adjusted in angle; A cooling liquid flow channel (101) is provided inside the flow plate assembly (10), and cooling liquid pipes (103) are installed at both ends of the flow plate assembly (10) via fastening nuts (102); the cooling liquid auxiliary pipeline system includes a plurality of flow plate assemblies (10) that are connected to each other via the cooling liquid pipes (103); The flow path plate assembly (10) is located above the instrument; The automatic analyzer is provided with a spiral hose that cooperates with the cold liquid auxiliary pipeline system. The liquid in the spiral hose can absorb heat from the cold liquid auxiliary pipeline system and can be adjusted in angle together with the flow path plate assembly (10).

2. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 1, characterized in that: A temperature monitoring device is installed in the isothermal body (5).

3. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 2, characterized in that: The pressure regulating mechanism further comprises a rotating shaft (12), a flow path plate (15), a pressure sensor, and a driving motor (11) for driving the flow path plate (15) to rotate around the rotating shaft (12); the flow path plate assembly (10) is mounted on the flow path plate (15).

4. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 3, characterized in that: The flow path plate (15) has a rotation angle range of 0-15°.

5. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 3, characterized in that: A fixing portion (13) configured for the flow path plate (15) is installed inside the automatic analyzer, and an inserting strip (131) is passed through the fixing portion (13). When the driving motor (11) drives the flow path plate (15) to rotate until it is flush with a horizontal plane, the flow path plate (15) can be fixed to the automatic analyzer through the inserting strip (131).

6. The pressure regulating mechanism and condensation control system for a volatile phenol flow path according to claim 1, characterized in that: A cooling liquid cavity for containing cooling liquid is provided inside the isothermal body (5); the cooling liquid auxiliary pipeline system includes a driving pump for driving the flow of the internal liquid, and both ends of the cooling liquid auxiliary pipeline system are connected to the cooling liquid cavity inside the isothermal body (5).

7. The pressure regulating mechanism and condensation control system for a volatile phenol flow path according to claim 1, characterized in that: The condensing assembly (01) further comprises a heat dissipation fin (2) mounted on the isothermal body (5), a semiconductor refrigeration fin (3) is mounted between the heat dissipation fin (2) and the isothermal body (5), and a fan (1) is mounted on the heat dissipation fin (2).

8. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 3, characterized in that: The system further comprises a power supply and a microcontroller. The microcontroller is connected to a temperature sensor and a pressure sensor via an ADC, receives analog signals from the temperature sensor and the pressure sensor, and outputs actions to drive the fan (1) and the motor (11).

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