Pressure regulating mechanism for volatile phenol flow path and condensation control system

Abstract

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, and the pressure regulating mechanism comprises a condensation assembly and a pressure regulating mechanism; the condensation assembly comprises an isothermal body 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 on the isothermal body; the pressure adjusting mechanism comprises a flow path plate assembly which is driven by a motor and can conduct angle adjustment. Therefore, the device can effectively realize condensation link control and pressure balance control in a volatile phenol sample detection process by arranging the unique condensation assembly and the pressure adjusting mechanism, improves the accuracy and reliability of a detection result, and is suitable for a volatile phenol automatic analyzer based on a flow injection analysis method; and especially, the method has obvious advantages in occasions requiring high-precision detection of volatile phenol samples.

Description

Technical Field

[0001] The present 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] A volatile phenol automatic analyzer is an instrument for measuring the content of volatile phenols in water, and its function is to achieve rapid, accurate, and automated detection of volatile phenols in water, and it is widely used in fields such as municipal sewage, industrial wastewater, surface water, groundwater, and drinking water.

[0003] In the volatile phenol flow injection detection project, it is necessary to cool and condense the phenol-containing steam into a liquid, and then transport it to the next reaction device through a pump tube. In the existing flow injection condensation device structures, a single semiconductor refrigeration chip is mostly used, resulting in low refrigeration efficiency; in addition, in terms of control, the existing devices use open-loop control, and when there is no steam transportation, condensation water mist or even ice crystals will be generated at the cold end, which will cause blockage or increased pressure in the pipeline and affect the normal operation of the flow. There is currently no structure in the prior art to improve this problem. Summary of the Invention

[0004] In view of the above defects, the purpose of the present invention is to provide a pressure regulating mechanism and a condensation control system for a volatile phenol flow path, aiming to solve the problems raised in the background art. The system includes a condensation component and a pressure regulating mechanism; the condensation component includes an isothermal body for maintaining a low temperature and a cold liquid auxiliary pipeline system for pre-cooling, and a pipeline for accommodating the sample to be cooled is wound around the isothermal body; the pressure regulating mechanism includes a flow path plate assembly that can be angle-adjusted driven by a motor.

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

[0006] Further, the pressure regulating mechanism further 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] Further, the rotation angle range of the flow path plate is 0-15°.

[0008] Further, a fixing part is installed inside the automatic analyzer and is configured with the flow path plate, and an insertion bar is penetrated through the fixing part. When the driving motor drives the flow path plate to rotate to be flush with the horizontal plane, the flow path plate can be fixed on the automatic analyzer through the insertion bar.

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

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

[0011] Furthermore, the condensation assembly further includes heat dissipation fins installed on the isothermal body, a semiconductor refrigeration chip is installed between the heat dissipation fins and the isothermal body, and a fan is installed on the heat dissipation fins.

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

[0013] Thus, the beneficial effects of the present invention are as follows: The condensation structure of the system adopts double semiconductor refrigeration and double fan heat dissipation, with a higher refrigeration power density and a smaller volume of the cooling box. The circuit drives the refrigeration chip in a constant current mode, significantly reducing the circuit EMI at high power. The software control adopts the PID algorithm, which can better achieve the target constant temperature to be set. At the same time, the maximum power of the system is 80W, and the temperature constant performance is better when transporting the condensate block of high-temperature water vapor at 165°C. It can respond and adjust faster to the temperature of the condensate block. At the same time, the present invention combines with adjusting the angle of the reaction flow path plate of volatile phenol to adjust the pipeline pressure, which can better improve the chemical reaction efficiency in the pipeline, thereby improving the accuracy of product detection.

[0014] By setting a unique condensation assembly and a pressure regulating mechanism, the control of the condensation link and the pressure balance control in the detection process of volatile phenol samples can be effectively realized, improving the accuracy and reliability of the detection results. It is applicable to the automatic analyzer for volatile phenol based on the flow injection analysis method, especially having significant advantages in the occasions where high-precision detection of volatile phenol samples is required. Description of the Drawings

[0015] Figure 1 is the control flow chart of the refrigeration assembly; Figure 2 is the structural schematic diagram of the refrigeration assembly; Figure 3 is the top view of the automatic analyzer for volatile phenol; Figure 4 is Figure 3 the sectional view in the A-A direction of Figure 5 is the structural sectional view of the flow path plate assembly; Figure 6 is the combined structural schematic of the flow path plate assembly; Figure 7 isFigure 3 Schematic enlarged view of part B structure; In the figure: 01 - Condensation assembly; 1 - Fan; 2 - Heat dissipation fins; 3 - Thermoelectric cooler; 4 - Support base; 5 - Isothermal body; 6 - Mounting base plate; 10 - Flow path plate assembly; 101 - Cold liquid flow path; 102 - Fastening nut; 103 - Cold liquid pipe; 11 - Driving motor; 12 - Rotating shaft; 13 - Fixed part; 131 - Insert bar; 14 - Shaft mounting plate; 15 - Flow path plate. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0017] It should be noted that in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0018] At the same time, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0019] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, 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 here are only used to explain the present invention and are not used to limit the present invention.

[0020] Refer to Figure 1-5 , the purpose of the present invention is to provide a pressure regulating mechanism and a condensation control system for a volatile phenol flow path, and this system is based on flow injection analysis (FIA) to quickly and efficiently detect the chemical components in liquid samples.

[0021] The basic principle is as follows: A certain amount of sample is injected into a continuously flowing and excessive carrier stream. The sample is carried by the carrier stream through the reaction device and the detection device, undergoes a chemical reaction or physical interaction, and is then detected. Finally, the content of the substance is determined based on the intensity and characteristics of the detection signal.

[0022] The equipment used for the entire process of carrier stream, reaction, and detection is a common volatile phenol automatic analyzer on the current market, which includes a sampling system responsible for sample injection processing. The peristaltic pump in the sampling system extracts a certain amount of water sample from each sampling point and quantitatively injects it into the carrier stream through the sampling valve.

[0023] After each water sample enters the carrier stream, the two are mixed and react in a specific reaction tube or reaction coil. During this process, a color reagent can be added to make the substance to be detected form a colored complex or derivative. The color of the colored solution after color development has a proportional relationship with the concentration of the substance to be detected in the solution, that is, a chemical reaction generates a colored substance with a specific absorbance, or the properties of the sample are changed due to physical interaction for subsequent detection. Finally, the colored solution after color development enters a detector, such as an optical detector like a spectrophotometer. The detector converts it into an electrical signal according to the intensity and characteristics of the detection signal. The data processing system processes and analyzes the electrical signal, including operations such as data correction, calculation, storage, and display, and finally obtains the concentration or content of the substance to be detected and outputs the measurement results and reports.

[0024] 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 pump tube transportation to the reaction device for analysis.

[0025] 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.

[0026] The condensation component 01 includes an isothermal body 5 for maintaining low temperature and a cold liquid auxiliary pipeline system for pre-cooling. Specifically, the condensation component 01 includes: a fan 1, heat dissipation fins 2, a semiconductor refrigeration sheet 3, a support seat 4, an isothermal body 5, a mounting base plate 6, and a housing. The pressure regulating mechanism includes a flow path plate assembly 10 that can be angle-adjusted driven by a motor.

[0027] The cooling surface of the semiconductor refrigeration sheet 3 is in direct contact with the isothermal body 5. A pipeline for accommodating the sample to be cooled is wound around the isothermal body 5. Inside the isothermal body 5, there is a coolant cavity, and the coolant cavity is filled with a coolant. Specifically, the coolant is a fluid substance with a relatively low freezing point. The design of the heat dissipation fins 2 increases the contact area with the air. When the fan 1 starts, it accelerates the air flow, reducing the temperature of the heat dissipation fins 2. Through the heat conduction of the semiconductor refrigeration sheet 3, the temperature of the isothermal body 5 is reduced. As a result, the phenolic vapor flowing through the pipeline corresponding to the isothermal body 5 for accommodating the sample to be cooled is condensed into a liquid and flows to the next reaction device; A temperature monitoring and control device is installed in the isothermal body 5, which can keep the device temperature constant.

[0028] The other side of the semiconductor refrigeration sheet 3 is in contact with the heat dissipation fins 2. The heat dissipation fins 2 are installed on the isothermal body 5 by screws. A fan 1 is installed on the heat dissipation fins 2. The heat at the other end of the semiconductor refrigeration sheet 3 is taken out through the fan 1 and the heat dissipation fins 2 to ensure the refrigeration effect of the semiconductor refrigeration sheet 3.

[0029] The support base 4 is installed between the two heat dissipation fins 2. The condensation device is installed on the mounting base plate 6 through the support base 4. The outer shell covers the entire condensation device to prevent the temperature from losing too quickly.

[0030] At the same time, a ventilation opening is provided on the outer shell. The ventilation opening is set at the air outlet position of the fan 1, so as to blow the heat taken out by the fan 1 outside the condensation device to ensure the replacement of hot and cold air.

[0031] At the same time, a circuit board installation position is provided at the upper end of the outer shell to make the whole structure modular and convenient for disassembly and assembly.

[0032] The circuit drives the refrigeration sheet in a constant current mode, significantly reducing the circuit EMI at high power.

[0033] The software control adopts the PID algorithm, which can better achieve the set target constant temperature. At the same time, the maximum power of the system is 80W, and the temperature constant performance is better when transporting the condensate block with high-temperature steam at 165°C. It can respond and adjust faster to the temperature of the condensate block.

[0034] The pressure regulating mechanism includes a flow path plate assembly 10 that can be angle-adjusted driven by a motor. Specifically, a pressure regulating mechanism and a condensation control system for a volatile phenol flow path also include a flow path plate assembly 10 for auxiliary cooling of volatile phenol, a drive motor 11 for driving the rotation of the flow path plate assembly 10, a rotating shaft 12, a shaft mounting plate 14, a flow path plate 15, and a pressure sensor (not shown in the figure).

[0035] The flow path board assembly 10 is a cylindrical metal rod, and the flow path board assembly 10 is installed on the flow path board 15 by a buckle; the driving motor 11 is fixed inside the instrument housing, and the output shaft of the motor is installed and fixed to the flow path board 15 through a fastener. When the driving motor 11 operates, the motor shaft drives the flow path board 15 to rotate around the rotation shaft 12, adjusting the angle of the flow path board 15 so that the flow path board 15 can rotate within the angle range of 0 - 15°.

[0036] A pressure sensor is provided in the flow path. When the pressure sensor detects abnormal pressure in the pipe, the pressure sensor feeds back the abnormality to the system, and the system will operate the driving motor 11 according to the pressure condition. By rotating the driving motor 11, the angle of the volatile phenol flow path board 15 is adjusted; in the inclined pipeline, the shape of the liquid level of the condensate and the action mode of the surface tension change. Compared with the vertical pipeline, the inclined pipeline makes the liquid film formed by the condensate on the inner wall of the pipeline flow more continuously and evenly, reducing the situation where droplets are suspended due to surface tension and accumulate on the pipe wall to form blockage points, enabling the condensate to be transported away more smoothly, and ultimately achieving the purpose of adjusting the pressure in the pipe to balance the pressure in the pipe.

[0037] Preferably, a fixing part 13 configured with the flow path board 15 is installed inside the automatic analyzer, and an insert bar 131 is inserted through the fixing part 13. When the driving motor 11 drives the flow path board 15 to rotate to be flush with the horizontal plane, the flow path board 15 can be fixed to the automatic analyzer through the insert bar 131 to keep the flow path board 15 stable.

[0038] Preferably, a through cold liquid flow channel 101 is provided inside the flow path board assembly 10. Cold liquid pipes 103 are installed at both ends of the flow path board assembly 10 through fastening nuts 102. A number of flow path board 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 further includes a driving pump for driving the internal liquid to flow. Both ends (the liquid inlet end and the liquid outlet end) of the cold liquid auxiliary pipeline system are connected to the isothermal body 5, that is, communicated with the coolant cavity inside the isothermal body 5.

[0039] The cold liquid auxiliary pipeline system is connected to the coolant cavity inside the isothermal body 5. When the coolant circulates in the cold liquid auxiliary pipeline 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 will not affect the experimenter's visual observation of the liquid state in the pipeline. For example, during the pre-condensation process, the phenol-containing vapor exists as "disconnected bubbles" in the corresponding pipeline, and the cold liquid auxiliary pipeline system absorbs heat during this process. The disconnection distance of the bubbles in the corresponding spiral hose will slightly decrease, and at the same time, the liquid flow rate can be observed to infer the blockage situation 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, preventing insufficient dissolution of the phenol-containing gas caused by incomplete condensation, thereby achieving a more accurate analysis effect.

[0040] See the appendix Figure 1 The system also includes a power supply and a microcontroller. The microcontroller is connected to the temperature sensor and the pressure sensor through the ADC, receives the analog signals transmitted by the temperature sensor and the pressure sensor, and outputs the actions of driving the fan 1 and the driving motor 11. Specifically, the power supply provides power for all components to maintain the operation of the system; the STM32F407 microcontroller serves as the core control unit of the system. It is connected to the synchronous rectification digital control constant current circuit through the DAC (digital-to-analog converter) to send control signals to the internal circuit of the system; at the same time, the microcontroller is also connected to the temperature sensor through the ADC (analog-to-digital converter), receives the analog signal transmitted by the temperature sensor, and converts it into a digital signal for processing. The circuit receives the control signal from the microcontroller and outputs to drive the fan and the refrigeration chip (i.e., the semiconductor refrigeration chip 3) to ensure that they can work according to the predetermined parameters. The temperature sensor monitors the temperature of the isothermal body 5 in real time and sends the monitored temperature data to the microcontroller through the ADC, thereby realizing closed-loop control to ensure that the system can adjust the power of the fan 1 according to the actual temperature to maintain the constant temperature of the condensation block.

[0041] In summary, during actual use, the operator first installs the sample to be tested. A certain amount of sample is extracted from each sampling point through the peristaltic pump in the injection system and quantitatively injected into the carrier pipeline through the injection valve. The carrier carries the phenol-containing sample and flows through the flow path plate assembly 10, the condensation assembly 01, the reaction device, and the detection device in sequence.

[0042] During the whole process, the fan 1 of the condensation assembly 01 starts and accelerates the air flow to reduce the temperature of the heat dissipation fins 2. The semiconductor refrigeration chip 3 uses heat conduction to reduce the temperature of the isothermal body 5, cools the coolant flowing through the corresponding pipeline of the isothermal body 5, and at the same time pre-cools the flow path plate assembly 10, where the temperature monitoring and control device inside the isothermal body 5 monitors and maintains the device temperature constant.

[0043] Meanwhile, under the drive of the driving motor 11, the flow path board assembly 10 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 feedback an abnormal signal to the system. The system controls the rotation of the driving motor according to the pressure condition, adjusts the angle of the flow path board 15, so that the condensate forms a liquid film that is more likely to flow continuously and evenly on the inner wall of the inclined pipeline, reduces the situation of liquid droplets hanging and accumulating at the blockage point, thereby adjusting the pressure in the pipe and achieving pressure balance in the pipe.

[0044] The fixing part 13 inside the automatic analyzer can be fixed by means of the inserting strip 131 when the flow path board 15 rotates to be flush with the horizontal plane, ensuring the stability of the flow path board 15. In addition, the pipeline system composed of the cold liquid flow path 101, the cold liquid pipe 103, etc. in the cold liquid auxiliary pipeline system is connected to the coolant cavity inside the isothermal body 5. During the coolant circulation process, it can pre-absorb the heat of the liquid in the volatile phenol flow path, which not only does not affect the experimenter's observation of the liquid state in the pipeline, but also can accelerate the condensation effect of the volatile phenol flow path at the isothermal body 5, preventing inaccurate analysis caused by insufficient dissolution of the phenol-containing gas.

[0045] In the system circuit, the driving fan 1 and the refrigerating sheet are output according to the control signal sent by the microcontroller, ensuring that they work according to the predetermined parameters. The temperature sensor monitors the temperature of the isothermal body 5 in real time and feeds it back to the microcontroller through the ADC, realizing closed-loop control, adjusting the power of the fan 1 according to the actual temperature, and maintaining the constant temperature of the condensation block, with high structural power volume density. At the same time, the target constant temperature of the system can be set (the target condensation temperature of volatile phenol is set at 5°C - 25°C); the circuit reduces EMI and has the advantages of no interference when outputting high power.

[0046] Therefore, by setting a unique condensation component and a pressure regulating mechanism, the present invention can effectively realize the control of the condensation link and the pressure balance control in the detection process of volatile phenol samples, improve the accuracy and reliability of the detection results, and is applicable to the automatic analyzer for volatile phenol based on flow injection analysis method, especially having significant advantages in occasions where high-precision detection of volatile phenol samples is required.

[0047] Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A pressure regulating mechanism and a condensation control system for a volatile phenol flow path, characterized in that, An automatic analyzer is included, and a condensation component (01) and a pressure regulating mechanism are provided inside the automatic analyzer; The condensation component (01) includes an isothermal body (5) for maintaining a low temperature and a cold liquid auxiliary pipeline system for pre-cooling. 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) that can be angle-adjusted and is driven by a motor.

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, wherein, The pressure regulating mechanism further includes 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 installed 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 rotation angle range of the flow path plate (15) is 0 - 15°.

5. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 2, wherein A fixing part (13) configured with the flow path plate (15) is installed inside the automatic analyzer. An insertion bar (131) is penetrated through the fixing part (13). When the driving motor (11) drives the flow path plate (15) to rotate to be flush with the horizontal plane, the flow path plate (15) can be fixed to the automatic analyzer through the insertion bar (131).

6. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 1, characterized in that, A penetrating cold liquid flow channel (101) is provided inside the flow path plate assembly (10). Cold liquid pipes (103) are installed at both ends of the flow path plate assembly (10) through fastening nuts (102); the cold liquid auxiliary pipeline system includes several flow path plate assemblies (10) that are communicated with each other through the cold liquid pipes (103).

7. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 1, wherein A coolant cavity for containing coolant is provided inside the isothermal body (5); the cold liquid auxiliary pipeline system includes a driving pump for driving the internal liquid to flow, and both ends of the cold liquid auxiliary pipeline system are communicated with the coolant cavity inside the isothermal body (5).

8. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 1, characterized in that, The condensation component (01) further includes heat dissipation fins (2) installed on the isothermal body (5). A semiconductor refrigeration sheet (3) is installed between the heat dissipation fins (2) and the isothermal body (5), and a fan (1) is installed on the heat dissipation fins (2).

9. The pressure regulating mechanism and condensation control system for the volatile phenol flow path according to claim 3, characterized in that, The system further includes a power supply and a microcontroller. The microcontroller is connected to the temperature sensor and the pressure sensor through an ADC, receives the analog signals transmitted by the temperature sensor and the pressure sensor, and outputs actions for driving the fan (1) and the driving motor (11).

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