A chromatograph temperature monitoring device

Abstract

The application relates to a chromatograph temperature monitoring device, and belongs to the technical field of chemical analysis equipment. The structure of the temperature monitoring device comprises a column oven, a first connecting port is arranged at the top of the column oven, a communication pipeline is arranged on the first connecting port in the column oven, a second connecting port is arranged at the bottom of the column oven, a monitoring chamber is arranged in the middle of the communication pipeline, one end of the monitoring chamber is communicated with the communication pipeline, and the other end of the monitoring chamber penetrates through the outside of the column oven, a chromatographic column is arranged in the column oven, the top end of the chromatographic column is arranged on the first connecting port through the communication pipeline, the bottom end of the chromatographic column is connected with the second connecting port, a heating assembly is arranged on the inner wall of the column oven, and a circulating air cooling assembly is arranged on one side of the column oven. The application has the technical effect of adapting to multi-working-condition composite fault monitoring requirements.

Description

Technical Field

[0001] This application relates to the technical field of chemical analysis equipment, and in particular to a temperature monitoring device for a chromatograph. Background Technology

[0002] As a high-precision analytical instrument, the operating temperature of the chromatographic column, a core component of a chromatographic instrument, has a decisive impact on sample separation efficiency, analytical accuracy, and repeatability. This includes the column oven, which is connected to both the autosampler and the detector. Existing chromatographic temperature monitoring devices mostly employ independent temperature sensors and flow monitoring modules. These devices collect temperature and flow signals through electronic components and transmit them to the control system, which then drives the heating and cooling components to adjust the temperature. While some devices integrate monitoring functions, their structures are loosely configured and rely on complex electrical control circuits to achieve signal linkage. However, these devices suffer from problems such as susceptibility of electronic components to electromagnetic interference, numerous potential failure points, high maintenance costs, and signal transmission delays, making it difficult to quickly respond to complex fault conditions.

[0003] Patent (CN 111089927 A) discloses a column temperature control device and control method for a chromatograph, belonging to the field of chromatograph column temperature control technology. The technical problem to be solved is: to provide an improvement in the hardware structure and control method of a column temperature control device for a chromatograph. The technical solution adopted to solve this problem includes: a column housing, which is a sealed box on all four sides, with a column housing insulation layer on the inner side; the interior of the column housing is equipped with a first temperature-sensing resistance sensor, a chromatographic column, a heating device, a second temperature-sensing resistance sensor, a cooling motor, a blower motor, and an electrical control box; a heat dissipation vent is provided at the bottom of the column housing, and the location of the heat dissipation vent is further... The column is equipped with a perforated heat sink; the chromatographic column is mounted in the middle of the column housing via a support, a first temperature-sensing resistance sensor is separately mounted on the upper side of the column, and a heating device is mounted on the lower side of the column; the above patent can realize multi-point monitoring of the internal temperature of the chromatographic column housing and coordinated control of heating and heat dissipation, ensuring the basic stability of the working temperature of the chromatographic column, but it is limited to collecting temperature signals through temperature-sensing resistance sensors and relying on electrical control boxes to realize a single temperature control logic; for complex fault conditions where the medium flow state and temperature are coupled, it cannot effectively realize the visual monitoring of the state and rapid linkage protection, and it is difficult to accurately adapt to the multi-condition complex fault monitoring needs.

[0004] Regarding the aforementioned technologies, the inventors believe that they have the drawback of being difficult to accurately adapt to the needs of multi-condition composite fault monitoring. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a chromatograph temperature monitoring device.

[0006] This application provides a temperature monitoring device for a chromatograph, which adopts the following technical solution:

[0007] A chromatograph temperature monitoring device includes a column oven. The top of the column oven has a first connection port, and a connecting pipe is provided through the first connection port inside the column oven. The bottom of the column oven has a second connection port. A monitoring chamber is located in the middle of the connecting pipe, one end of which is connected to the connecting pipe, and the other end of which extends through the outside of the column oven. A chromatographic column is installed inside the column oven, with its top end connected to the first connection port via the connecting pipe, and its bottom end connected to the second connection port. A heating assembly is installed on the inner wall of the column oven. A circulating air-cooling assembly is installed on one side of the column oven.

[0008] By adopting the above technical solution, the connecting pipe, monitoring chamber, and column oven are integrated. One end of the monitoring chamber is connected to the connecting pipe, and the other end extends to the outside of the column oven, simplifying the overall structure of the device and reducing the space occupied by the equipment. The top of the chromatographic column is directly connected to the first connection port through the connecting pipe, and the bottom end is connected to the second connection port, forming a simple sample transfer path. The device integrates a heating component and a circulating air-cooling component. The heating component provides a stable heating environment required for chromatographic column separation, and the circulating air-cooling component quickly dissipates local heat in the chamber through air circulation. The two work together to achieve precise temperature control in the column oven, avoiding temperature fluctuations or local overheating, and ensuring that the chromatographic column is always in the optimal operating temperature range, significantly improving the accuracy and repeatability of sample separation. The monitoring chamber located in the middle of the connecting pipe can monitor the temperature changes and flow state of the medium through the structure inside the monitoring chamber, enabling rapid identification and location of multi-condition complex faults without the need for additional detection equipment.

[0009] Preferably, the monitoring chamber is provided with a baffle, the baffle has a sliding hole in the middle, and a sliding rod is slidably disposed in the sliding hole; one end of the sliding rod is provided with an adjustment port, a temperature monitoring component is disposed in the adjustment port, and the other end of the sliding rod is provided with a flow monitoring component.

[0010] By adopting the above technical solution, the temperature monitoring component and the flow monitoring component are integrated on the same sliding structure through the sliding cooperation of the baffle and the sliding rod inside the monitoring chamber. This enables the two monitoring functions to work together in tandem. Changes in the flow state can directly drive the temperature monitoring component to move synchronously through the displacement of the sliding rod, thereby achieving synchronous monitoring of both medium flow and temperature parameters. This avoids the limitations of monitoring a single parameter and improves the comprehensiveness and accuracy of the device's monitoring.

[0011] Preferably, the temperature monitoring component includes a sleeve, an observation shaft, and a bimetallic strip; a slider is provided on one end of the observation shaft, and a slide rail is provided on one end of the sleeve, the slide rail being helical; one end of the observation shaft is disposed within the sleeve, and the slider is slidably connected to the slide rail; the other end of the sleeve is slidably disposed within the adjustment port; one end of the bimetallic strip is fixedly disposed within the sleeve, one side of the other end of the bimetallic strip abuts against one end of the observation shaft, and a reset hook is provided at one end of the observation shaft, the reset hook being used to hook the other side of the other end of the bimetallic strip.

[0012] By adopting the above technical solution, and utilizing the different coefficients of thermal expansion and contraction of the bimetallic strip, the bimetallic strip bends and deforms when the temperature changes, directly pushing the observation shaft. At the same time, the observation shaft cooperates with the spiral slide rail inside the sleeve through the slider, converting the temperature change into a spiral displacement of the observation shaft. The temperature status can be intuitively identified through the external observation window, improving the intuitiveness and reliability of temperature monitoring.

[0013] Preferably, the flow monitoring component includes a detection plate, a support rod, a tension spring, and a mating rod; one end of the support rod is disposed on the inner wall of the connecting pipe, one side of the detection plate is rotatably disposed on the other end of the support rod, one end of the detection plate is rotatably disposed on one end of the mating rod, and the other end of the mating rod is slidably disposed on the other end of the sliding rod; one end of the tension spring is rotatably disposed on one side of the detection plate, and the other end of the tension spring is rotatably disposed on the monitoring chamber.

[0014] By adopting the above technical solution, when the medium flows in the connecting pipe, the impact force of the medium can directly push the detection plate to rotate around the support rod. Through the rotational connection between the detection plate and the matching rod, and the sliding connection between the matching pipe and the sliding rod, the flow signal is quickly converted into the displacement action of the sliding rod. The two ends of the tension spring are respectively rotatedly connected to the detection plate and the monitoring chamber to form a stable reset structure. When the medium flow is interrupted, the tension spring can pull the detection plate to reset quickly by its own rebound force, thereby driving the sliding rod to move in the opposite direction.

[0015] Preferably, a first marking area is provided at one end of the observation axis; a second marking area is provided on the observation axis on one side of the first marking area, and both the first marking area and the second marking area are circumferentially arranged on the observation axis; the first marking area is a normal marking area; the second marking area is divided into a high temperature marking area and a flow interruption marking area.

[0016] By adopting the above technical solution, a first marking area including a normal marking and a second marking area including a high temperature marking and a flow interruption marking are set circumferentially on the observation axis. The combined state of the medium's temperature and flow parameters is transformed into markings displayed on the observation window. By observing the markings on the observation window, various operating states of the device, including normal state, flow interruption state, high temperature state, and combined fault state of flow interruption and high temperature, can be quickly determined, significantly shortening fault identification time and improving equipment operation and maintenance efficiency. The markings adopt a partitioned and classified design, with different states corresponding to independent markings. The marking areas are arranged circumferentially on the observation axis and are precisely linked to the spiral displacement and sliding displacement of the observation axis. Temperature changes drive the observation axis to rotate and slide to switch marking areas, while changes in flow state drive the observation axis to slide and switch markings. The two actions do not interfere with each other, effectively avoiding confusion between markings of different operating states and improving the accuracy of state determination.

[0017] Preferably, the bottom of the sleeve is provided with an unlocking structure, which includes a trigger block, an unlocking cavity, a locking pin, and an unlocking spring; one end of the unlocking cavity is disposed within the wall of the bottom of the sleeve; one end of the trigger block is slidably disposed at one end of the unlocking cavity, and the other end of the trigger block is disposed within the sleeve; the unlocking spring is sleeved on the trigger block, one end of the unlocking spring is fixedly disposed at the bottom of the sleeve, and the other end of the unlocking spring is fixedly disposed at the other end of the trigger block; the locking pin is slidably disposed at the other end of the unlocking cavity, and the bottom of the locking pin is provided with an unlocking inclined surface; the unlocking inclined surface of the locking pin abuts against the trigger block; a locking groove is provided in the adjustment port, and the locking groove is used to cooperate with the locking pin for sliding locking.

[0018] By adopting the above technical solution, the unlocking structure is triggered by the temperature deformation of the bimetallic strip. When the medium temperature is within the normal range, the trigger block presses against the unlocking slope of the locking pin, causing the locking pin to engage in the locking groove of the adjustment port, restricting the sleeve sliding and ensuring the stable operation of the temperature monitoring component under a single parameter change. When the medium temperature is too high, the bimetallic strip bends away from the trigger block, causing the trigger block to move backward under the force of the unlocking spring, releasing the pressure on the locking pin. The locking pin slides down and disengages from the locking groove, completing the sleeve unlocking. This design only allows sleeve displacement under high temperature conditions, accurately adapting to the monitoring logic of combined faults of flow interruption and high temperature, avoiding malfunctions under single flow interruption or high temperature conditions, and improving the accuracy of fault state determination.

[0019] Preferably, a third marking structure is provided inside the sliding rod of the adjustment port. The third marking structure includes a sliding cavity, a driving cavity, a marking cylinder, a driving rod, a driving piston, and a return spring. The sliding cavity is disposed in the wall on the side of the adjustment port. One end of the marking cylinder is slidably disposed in the sliding cavity, and the other end of the marking cylinder is circumferentially provided with a composite marking. The driving cavity is disposed inside the sliding rod at the bottom of the adjustment port. The driving piston is slidably disposed in the driving cavity. One end of the driving rod is fixedly disposed at one end of the driving piston, and the other end of the driving rod passes through the bottom of the adjustment port and is disposed inside the adjustment port. The driving rod is slidably connected to the sliding rod, and the other end of the driving rod abuts against the sleeve. The return spring is sleeved on the driving rod, and one end of the return spring is fixedly disposed at the other end of the driving rod. The other end of the return spring is fixedly disposed at the bottom of the adjustment port.

[0020] By adopting the above technical solution, this structure, through the linkage design of the sliding cavity, the marking cylinder, the drive rod, and the drive cavity, allows the sleeve to slide after the unlocking structure is triggered by excessive temperature. When the flow monitoring component drives the sliding rod to move, the sleeve pushes against the drive rod, causing the drive piston to move within the drive cavity. This, in turn, pushes the marking cylinder outward along the sliding cavity to the observation window position, making the composite marking clearly visible. This achieves accurate visual indication of the combined high temperature and flow interruption faults, clearly distinguishing it from the display position and triggering conditions of the normal, high temperature, and flow interruption markings. This effectively avoids misjudgment of operating conditions, further improves the accuracy of device status monitoring, and makes the judgment of operating conditions more comprehensive.

[0021] Preferably, the heating assembly includes a resistance heating film and a micro switch; the resistance heating film is disposed inside the column temperature chamber, and the micro switch is disposed inside the other end of the monitoring chamber, and the micro switch is connected to the resistance heating film.

[0022] By adopting the above technical solution, the resistance heating film is attached to the inner wall of the column oven, resulting in a larger heating area. The heat can be evenly radiated to all areas inside the oven, avoiding uneven heating of the column and affecting the separation effect. This provides a stable and uniform temperature environment for chromatographic separation. The microswitch and the resistance heating film form a linkage control loop, and the microswitch is integrated inside the monitoring chamber. It can directly respond to the displacement of the sliding rod and the observation shaft. When the device experiences abnormal operating conditions such as flow interruption, high temperature, or a combination of flow interruption and high temperature, the displacement of the relevant components triggers the microswitch, quickly cutting off the power supply to the resistance heating film. This prevents the column from burning out or being damaged by high temperature, greatly improving the safety and reliability of the device operation.

[0023] Preferably, the circulating air-cooling assembly includes a centrifugal fan, a filter, an air inlet, an air duct cavity, and a grille; the centrifugal fan has an intake end and an exhaust end at both ends; the centrifugal fan is fixedly installed on one side of the column temperature chamber, with the intake end of the centrifugal fan located inside the column temperature chamber and the exhaust end of the centrifugal fan located outside the column temperature chamber; the air duct cavity is located within the bottom wall of the column temperature chamber; a negative pressure suction port is provided on the side of the centrifugal fan, and the negative pressure suction port is connected to one end of the air duct cavity; an air outlet is provided at the bottom of the column temperature chamber, and the air outlet is connected to the air duct cavity, with the grille installed on the air outlet; the air inlet is located on the other side of the column temperature chamber, and the air inlet is connected to the other end of the air duct cavity; the filter is installed on the air inlet.

[0024] By adopting the above technical solution, the centrifugal fan draws hot air from inside the column oven through the suction end and discharges it to the outside through the exhaust end. At the same time, the side negative pressure suction port forms a negative pressure, guiding the outside cold air through the air inlet, air duct cavity and bottom air outlet to complete the circulation. This can quickly balance the temperature inside the oven, avoid local overheating or temperature fluctuations, provide a stable working temperature range for the chromatographic column and ensure the consistency of chromatographic separation effect.

[0025] Preferably, an observation window is provided at the other end of the monitoring chamber; and a replacement door is provided on the column temperature box above the air inlet window.

[0026] By adopting the above technical solution, the observation window is set at the external end of the monitoring chamber. The status of the indicator can be directly observed through the observation window, and the four operating conditions of the device—normal, flow interruption, high temperature, and combined flow interruption and high temperature fault—can be quickly determined. The chromatographic column can be replaced by changing the door.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Utilizing the different coefficients of thermal expansion and contraction of bimetallic strips, the bimetallic strips bend and deform when the temperature changes, directly pushing the observation shaft. At the same time, the observation shaft cooperates with the spiral slide rail inside the sleeve through the slider, converting the temperature change into the spiral displacement of the observation shaft. The temperature status can be intuitively identified through the external observation window, improving the intuitiveness and reliability of temperature monitoring.

[0029] 2. The observation axis is circumferentially marked with a first marking area including a normal marking, and a second marking area including a high-temperature marking and a flow interruption marking. The combined state of the medium's temperature and flow parameters is converted into markings displayed on the observation window. By observing the markings on the observation window, various operating states of the device can be quickly determined, including normal state, flow interruption state, high-temperature state, and combined fault state of flow interruption and high temperature. This significantly shortens fault identification time and improves equipment operation and maintenance efficiency. The markings adopt a zoned and classified design, with different states corresponding to independent markings. The marking areas are circumferentially arranged on the observation axis and are precisely linked to the spiral and sliding displacements of the observation axis. Temperature changes drive the observation axis to rotate and slide to switch marking areas, while changes in flow state drive the observation axis to slide and switch markings. The two actions do not interfere with each other, effectively avoiding confusion between markings of different operating states and improving the accuracy of state determination. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure in the embodiment.

[0031] Figure 2 This is a schematic diagram of the internal structure of the column oven in the embodiment.

[0032] Figure 3 This is a schematic diagram of the internal structure of the connecting pipe and the monitoring chamber in the embodiment.

[0033] Figure 4 yes Figure 3 Enlarged view of part A in the middle.

[0034] Figure 5 yes Figure 3 Enlarged view of section B in the middle.

[0035] Figure 6 This is a schematic diagram of the circulating air-cooled component in the embodiment.

[0036] Figure 7 This is a schematic diagram of the normal state in the embodiment.

[0037] Figure 8 This is a schematic diagram of the flow interruption state in the embodiment.

[0038] Figure 9 This is a schematic diagram of the high-temperature state in the embodiment.

[0039] Figure 10 This is a schematic diagram of the combined state of high temperature and flow interruption in the embodiment.

[0040] Explanation of reference numerals in the attached drawings: 1. Column temperature chamber; 11. First connection port; 12. Second connection port; 13. Air outlet; 14. Replacement door; 2. Connecting pipe; 3. Monitoring chamber; 31. Baffle; 311. Sliding hole; 32. Sliding rod; 321. Adjustment port; 3211. Locking groove; 33. Temperature monitoring component; 331. Sleeve; 3311. Slide rail; 332. Observation shaft; 3321. Slider; 333. Bimetallic strip; 334. Reset hook; 335. Third marking structure; 3351. Sliding cavity; 3352. Drive cavity; 3353. Marking cylinder; 3354. Composite marking; 3355. Drive rod; 3356. Drive piston; 3357. Reset spring; 34. Flow monitoring component; 341. Detection plate; 342. Support rod; 343. Tension spring; 344. Matching rod; 35. Observation window; 4. First marking area; 41. Normal marking; 5. Second marking area; 51. High temperature marking; 52. Flow interruption marking; 6. Unlocking structure; 61. Trigger block; 62. Unlocking cavity; 63. Locking pin; 631. Unlocking ramp; 64. Unlocking spring; 7. Chromatographic column; 8. Heating component; 81. Resistance heating film; 82. Microswitch; 9. Circulating air-cooling component; 91. Centrifugal fan; 911. Inlet; 912. Exhaust; 913. Negative pressure suction port; 92. Filter screen; 93. Air inlet window; 94. Air duct cavity; 95. Grille. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0042] This application discloses a temperature monitoring device for a chromatograph. (Refer to...) Figure 1 and Figure 2The system includes a column oven 1, with a first connection port 11 at the top and a connecting pipe 2 inside the column oven 1; a second connection port 12 at the bottom of the column oven 1; a monitoring chamber 3 in the middle of the connecting pipe 2, one end of which is connected to the connecting pipe 2, and the other end of which extends through the outside of the column oven 1; a chromatographic column 7 is installed inside the column oven 1, with the top of the column 7 connected to the first connection port 11 via the connecting pipe 2, and the bottom of the column 7 connected to the second connection port 12. The sample to be tested enters through the first connection port 11 at the top of the column oven 1 and is transported to the top of the chromatographic column 7 via the connecting pipe 2; the sample is separated within the chromatographic column 7. After separation, the column flows through the bottom end to the second connection port 12 at the bottom and is discharged. A heating component 8 is installed on the inner wall of the column oven 1. When the heating component 8 is activated, it provides a stable heating environment for the chromatographic column 7 inside the oven. A circulating air-cooling component 9 is installed on one side of the column oven 1. The circulating air-cooling component 9 regulates the temperature inside the oven through air circulation to ensure that the chromatographic column 7 is within the target working temperature range and to ensure the stability of the chromatographic separation effect. An observation window 35 is installed on the other end of the monitoring chamber 3. A replacement door 14 is installed on the column oven 1. When the chromatographic column 7 needs to be replaced, the replacement door 14 on the column oven 1 is opened, the connection between the chromatographic column 7 and the connecting pipe 2 and the second connection port 12 is disconnected, a new chromatographic column 7 is replaced, and the replacement door 14 is closed after reconnection.

[0043] Reference Figure 2 and Figure 6The heating assembly 8 includes a resistance heating film 81 and a micro switch 82. The resistance heating film 81 is installed inside the column oven 1, and the micro switch 82 is installed inside the other end of the monitoring chamber 3. The micro switch 82 is connected to the resistance heating film 81. When the resistance heating film 81 inside the column oven 1 is energized, it heats up, providing a stable heating environment for the chromatographic column 7 inside the oven and meeting the temperature requirements for chromatographic separation. The micro switch 82 is built into the end outside the monitoring chamber 3, forming a linkage control loop with the resistance heating film 81. The circulating air cooling assembly 9 includes a centrifugal fan 91, a filter 92, an air inlet window 93, an air duct cavity 94, and a grille 95. The centrifugal fan 91 has two ends: an intake end 911 and an exhaust end 912. The centrifugal fan 91 is fixedly installed on one side of the column oven 1. The intake end 911 of the centrifugal fan 91 is installed inside the column oven 1, and the exhaust end 912 of the centrifugal fan 91 is installed outside the column oven 1. The air duct cavity 94 is located inside the wall at the bottom of the column oven 1; a negative pressure suction port 913 is provided on the side of the centrifugal fan 91, and the negative pressure suction port 913 is connected to one end of the air duct cavity 94; an air outlet 13 is provided at the bottom of the column oven 1, and the air outlet 13 is connected to the air duct cavity 94, and a grille 95 is provided on the air outlet 13; an air inlet window 93 is provided on the other side of the column oven 1, and the air inlet window 93 is connected to the other end of the air duct cavity 94; a filter screen 92 is provided on the air inlet window 93; after the centrifugal fan 91 is started, the suction end 911 draws in the hot air inside the column oven 1 and discharges it to the outside of the oven from the exhaust end 912; at the same time, the negative pressure suction port 913 on the side of the centrifugal fan 91 forms a negative pressure, which causes the outside cold air to enter through the air inlet window 93 on the other side of the column oven 1, and the cold air flows into the air duct cavity 94 after being filtered for impurities by the filter screen 92, and finally discharged from the air outlet 13 at the bottom of the column oven 1, flowing around the chromatographic column 7 to achieve cooling.

[0044] Reference Figure 3 , Figure 4 and Figure 5The monitoring chamber 3 is equipped with a baffle 31, and a sliding hole 311 is provided in the middle of the baffle 31. A sliding rod 32 is slidably arranged in the sliding hole 311. One end of the sliding rod 32 is provided with an adjustment port 321, and a temperature monitoring component 33 is provided in the adjustment port 321. The other end of the sliding rod 32 is provided with a flow monitoring component 34. The temperature monitoring component 33 includes a sleeve 331, an observation shaft 332, and a bimetallic strip 333. A slider 3321 is provided on one end of the observation shaft 332, and a slide rail 3311 is provided on one end of the sleeve 331. The slide rail 3311 is spiral. One end of the observation shaft 332 is located in the sleeve 331, and the slider 3321 is slidably connected to the slide rail 3311. The other end of the sleeve 331 is slidably arranged in the adjustment port 321. The bottom is provided with an unlocking structure 6; one end of the bimetallic strip 333 is fixedly installed inside the sleeve 331, and the other end of the bimetallic strip 333 abuts against one end of the observation shaft 332; when the temperature change of the column temperature chamber 1 causes the temperature change in the connecting pipe 2, the heat is conducted to the bimetallic strip 333 inside the sleeve 331, and the bimetallic strip 333 bends and deforms due to the different thermal expansion coefficients of the two metals; the bimetallic strip 333 pushes against the observation shaft 332, and the slider 3321 at one end of the observation shaft 332 slides along the spiral slide rail 3311 inside the sleeve 331, causing the observation shaft 332 to generate a spiral rotation displacement; when the temperature drops, a reset hook 334 is provided at one end of the observation shaft 332, the bimetallic strip 333 returns to its original state, and abuts against the reset hook 334 to make the observation shaft 332 slide back to reset.

[0045] Reference Figure 2 and Figure 3 The flow monitoring component 34 includes a detection plate 341, a support rod 342, a tension spring 343, and a mating rod 344. One end of the support rod 342 is mounted on the inner wall of the connecting pipe 2. One side of the detection plate 341 is rotatably mounted on the other end of the support rod 342. One end of the detection plate 341 is rotatably mounted on one end of the mating rod 344, and the other end of the mating rod 344 is slidably mounted on the other end of the sliding rod 32. One end of the tension spring 343 is rotatably mounted on one side of the detection plate 341. The other end is rotatably mounted on the monitoring chamber 3; when the medium flows in the connecting pipe 2, it impacts the detection plate 341, causing it to rotate around the connecting end of the support rod 342. During the rotation of the detection plate 341, it pulls the sliding rod 32 to move along the sliding hole 311 of the baffle 31, thereby driving the temperature monitoring component 33 to slide synchronously; when there is no medium flowing in the pipe, the rebound force of the tension spring 343 pulls the detection plate 341 to reset, and the detection plate 341 pushes the sliding rod 32 to move in the opposite direction, pushing the temperature monitoring component 33.

[0046] Reference Figure 3 and Figure 5A first marking area 4 is provided at one end of the observation shaft 332; a second marking area 5 is provided on the observation shaft 332 on one side of the first marking area 4, and both the first marking area 4 and the second marking area 5 are circumferentially arranged on the observation shaft 332; the first marking area 4 is a normal marking 41; the second marking area 5 is divided into a high temperature marking 51 and a flow interruption marking 52; a third marking structure 335 is provided in the sliding rod 32 of the adjustment port 321, the third marking structure 335 includes a sliding cavity 3351, a driving cavity 3352, a marking cylinder 3353, a driving rod 3355, a driving piston 3356, and a return spring 3357; the sliding cavity 3351 is located in the wall of the side of the adjustment port 321, and one end of the marking cylinder 3353 is slidably disposed in the sliding cavity 3351. Inside, a composite mark 3354 is circumferentially arranged at the other end of the mark cylinder 3353; the drive cavity 3352 is located inside the sliding rod 32 at the bottom of the adjustment port 321; the drive piston 3356 is slidably arranged inside the drive cavity 3352; one end of the drive rod 3355 is fixedly arranged at one end of the drive piston 3356, and the other end of the drive rod 3355 passes through the bottom of the adjustment port 321 and is located inside the adjustment port 321. The drive rod 3355 is slidably connected to the sliding rod 32, and the other end of the drive rod 3355 abuts against the sleeve 331; the return spring 3357 is sleeved on the drive rod 3355, and one end of the return spring 3357 is fixedly arranged at the other end of the drive rod 3355; the other end of the return spring 3357 is fixedly arranged at the bottom of the adjustment port 321.

[0047] Reference Figure 2 and Figure 7 During normal operation, the medium flows normally in the connecting pipe 2, the detection plate 341 rotates under the impact of the medium, and pulls the sliding rod 32 to the corresponding position; at the same time, the medium temperature is in the normal range, the bimetallic strip 333 inside the sleeve 331 does not bend obviously, the observation shaft 332 maintains the initial position, and its normal mark 41 is facing the observation window 35. The determination device is in normal operation. At this time, the micro switch 82 is not triggered, and the resistance heating film 81 continues to heat stably.

[0048] Reference Figure 2 and Figure 8 When the temperature is within the normal range but the flow is interrupted, the medium in the pipeline is interrupted. The tension spring 343 pulls the detection plate 341 to reset. The detection plate 341 pushes the sliding rod 32 to move in the opposite direction through the cooperating rod 344, causing the temperature monitoring component 33 to slide synchronously. Because the temperature is normal, the bimetallic strip 333 is not deformed, the observation shaft 332 does not rotate, and the flow interruption mark 52 moves with the sliding rod 32 to the visible position of the observation window 35. The displacement distance of the sliding rod 32 touches the micro switch 82, triggering the switch to cut off the power supply to the resistance heating film 81 to prevent the chromatographic column 7 from burning dry.

[0049] Reference Figure 2 and Figure 9When the medium is flowing normally but the temperature is too high, the detection plate 341 keeps the sliding rod 32 pulled. The high temperature causes the bimetallic strip 333 to bend due to the difference in thermal expansion coefficients, pushing the observation shaft 332 so that the slider 3321 at one end slides out of the sleeve 331 along the spiral slide rail 3311. The observation shaft 332 rotates synchronously, rotating the high temperature mark 51 to the preset angle, so that the high temperature mark 51 is finally exposed at the observation window 35. The sliding distance of the observation shaft 332 touches the micro switch 82, cutting off the power supply to the resistance heating film 81, thus realizing high temperature protection.

[0050] Reference Figure 2 and Figure 10 In a combined fault state of simultaneous flow interruption and high temperature, the excessive temperature causes the bimetallic strip 333 to bend, triggering the unlocking mechanism 6 and releasing the sleeve 331 from its lock. Simultaneously, the medium flow is interrupted, and the tension spring 343 pulls the detection plate 341 to reset. Through the cooperating rod 344, the sliding rod 32 is displaced, causing the unlocked sleeve 331 to move synchronously. The sleeve 331 pushes against the drive rod 3355, and the drive piston 3356 slides within the drive cavity 3352, thereby pushing the marking cylinder 3353 outward along the sliding cavity 3351 to the observation window 35 position, clearly revealing the composite marking 3354. At this time, the markings on the original observation axis 332 do not interfere with the display of the composite marking 3354.

[0051] Reference Figure 3 and Figure 4The unlocking structure 6 includes a trigger block 61, an unlocking cavity 62, a locking pin 63, and an unlocking spring 64. One end of the unlocking cavity 62 is located within the wall at the bottom of the sleeve 331. One end of the trigger block 61 is slidably disposed at one end of the unlocking cavity 62, and the other end of the trigger block 61 is disposed within the sleeve 331. The unlocking spring 64 is sleeved on the trigger block 61, with one end of the unlocking spring 64 fixedly disposed at the bottom of the sleeve 331 and the other end of the unlocking spring 64 fixedly disposed at the other end of the trigger block 61. The locking pin 63 is slidably disposed at the other end of the unlocking cavity 62, and an unlocking inclined surface 631 is provided at the bottom of the locking pin 63. The unlocking inclined surface 631 of the locking pin 63 abuts against the trigger block 61. A locking groove 3211 is provided within the adjusting port 321, and the locking groove 3211 is used to cooperate with the locking pin 63 for sliding locking. One end of the trigger block 61 abuts against the bimetallic strip 333 inside the sleeve 331; at the same time, the other end of the trigger block 61 presses against the unlocking ramp 631 of the locking pin 63, causing the locking pin 63 to slide upward. The top of the locking pin 63 is engaged in the locking groove 3211 on the inner wall of the regulating port 321, realizing the relative locking between the sleeve 331 and the regulating port 321. At this time, the sleeve 331 cannot slide freely in the regulating port 321. When the temperature of the medium in the pipeline is too high, the bimetallic strip 333 bends and deforms due to the difference in thermal expansion coefficients. The trigger block 61 slides outward through the elastic force of the unlocking spring 64. At the same time, the locking pin 63 slides downward along the unlocking ramp 631. The top of the locking pin 63 disengages from the locking groove 3211, and the locked state between the sleeve 331 and the regulating port 321 is released. The sleeve 331 can slide freely in the regulating port 321.

[0052] The working principle of the chromatograph temperature monitoring device in this application is as follows: the resistance heating film 81 on the inner wall of the column oven 1 is energized and heats up, providing the chromatographic column 7 with the stable temperature required for separation; when the circulating air-cooling component 9 is started, the centrifugal fan 91's suction end 911 draws hot air from the oven and discharges it, while the side negative pressure suction port 913 guides cold air from the outside through the filter screen 92 and discharges it from the bottom air outlet 13 through the air duct cavity 94, flowing around the chromatographic column 7 to achieve cooling. Heating and air cooling work together to accurately maintain the target temperature range inside the column oven 1; the monitoring chamber 3 is linked to the temperature monitoring component 33 and the flow monitoring component 34 through the sliding rod 32, and combined with the first marking area 4, the second marking area 5 and the third marking structure 335 of the observation axis 332, to achieve four Monitoring and display of various operating states; Under normal operating conditions, the medium flows normally, and the impact detection plate 341 pulls the sliding rod 32 to move through the mating rod 344; When the temperature is normal, the bimetallic strip 333 is not deformed, the observation shaft 332 remains in its initial position, the normal indicator 41 faces the observation window 35, the micro switch 82 is not triggered, and the resistance heating film 81 continues to work; Under normal temperature but interrupted flow conditions, after the medium flow is interrupted, the tension spring 343 pulls the detection plate 341 to reset, causing the sliding rod 32 to move in the opposite direction through the mating rod 344, and the interrupted flow indicator 52 moves to the observation window 35 with the sliding rod 32; The displacement of the sliding rod 32 triggers the micro switch 82, cutting off the power supply to the resistance heating film 81 to prevent the column 7 from burning dry; Under conditions of medium flow but high temperature, the temperature... Excessive heat causes the bimetallic strip 333 to bend, pushing the observation shaft 332 to rotate along the spiral slide rail 3311, and the high-temperature indicator 51 rotates to the observation window 35; at the same time, the bimetallic strip 333 releases the trigger block 61, causing the trigger block 61 to move, the unlocking structure 6 to activate, and the sleeve 331 to unlock; because the sliding rod 32 has no displacement, the sleeve 331 does not push the drive rod 3355, and the third indicator structure 335 does not activate; the observation shaft 332 slides to trigger the micro switch 82, cutting off the power supply to the heating film; in the combined fault state of current interruption and high temperature, the high temperature triggers the unlocking structure 6 to unlock the sleeve 331, the current interruption pushes the sliding rod 32 to move, the sleeve 331 pushes the drive rod 3355, the drive piston 3356 pushes the indicator cylinder 3353 to extend, and the combined indicator 3354 is revealed. At the observation window 35; the superimposed displacement of the sliding rod 32 and the sleeve 331 triggers the micro switch 82, cutting off the power supply to the heating film; when the temperature drops back to the normal range, the bimetallic strip 333 returns to its original state, abutting against the reset hook 334 of the observation shaft 332, causing the observation shaft 332 to slide back to reset; in the unlocking structure 6, the unlocking spring 64 pushes the trigger block 61 to reset, the locking pin 63 re-engages into the locking groove 3211, and the sleeve 331 returns to the locked state; the reset spring 3357 of the third marking structure 335 pulls the drive rod 3355 and the marking cylinder 3353 to retract. When replacing the chromatographic column 7, open the replacement door 14 of the column temperature chamber 1, disconnect the chromatographic column 7 from the connecting pipe 2 and the second connection port 12, and close the replacement door 14 after replacement to restart.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A temperature monitoring device for a chromatograph, characterized in that: The system includes a column oven (1), with a first connection port (11) at the top and a connecting pipe (2) inside the column oven (1); a second connection port (12) at the bottom of the column oven (1); a monitoring chamber (3) in the middle of the connecting pipe (2), one end of the monitoring chamber (3) being connected to the connecting pipe (2) and the other end of the monitoring chamber (3) penetrating outside the column oven (1); a chromatographic column (7) inside the column oven (1), with the top end of the chromatographic column (7) connected to the first connection port (11) via the connecting pipe (2) and the bottom end of the chromatographic column (7) being connected to the second connection port (12); a heating assembly (8) on the inner wall of the column oven (1); and a circulating air-cooling assembly (9) on one side of the column oven (1). The monitoring chamber (3) is equipped with a baffle (31), and a sliding hole (311) is provided in the middle of the baffle (31). A sliding rod (32) is slidably arranged in the sliding hole (311). An adjustment port (321) is provided at one end of the sliding rod (32), and a temperature monitoring component (33) is provided in the adjustment port (321). A flow monitoring component (34) is provided at the other end of the sliding rod (32). The temperature monitoring component (33) includes a sleeve (331), an observation shaft (332), and a bimetallic strip (333). A slider (3321) is provided at one end of the observation shaft (332), and a slide rail (3311) is provided at one end inside the sleeve (331). The slide rail (3311) is helical. One end of the observation shaft (332) is located inside the sleeve (331), and the slider (3321) and the slide rail (3311) are connected. Sliding connection; the other end of the sleeve (331) is slidably disposed in the adjustment port (321); one end of the bimetallic strip (333) is fixedly disposed in the sleeve (331), one side of the other end of the bimetallic strip (333) abuts against one end of the observation shaft (332), one end of the observation shaft (332) is provided with a reset hook (334), the reset hook (334) is used to hook the other side of the other end of the bimetallic strip (333); The flow monitoring component (34) includes a detection plate (341), a support rod (342), a tension spring (343), and a mating rod (344); one end of the support rod (342) is disposed on the inner wall of the connecting pipe (2), one side of the detection plate (341) is rotatably disposed on the other end of the support rod (342), one end of the detection plate (341) is rotatably disposed on one end of the mating rod (344), and the other end of the mating rod (344) is slidably disposed on the other end of the sliding rod (32); one end of the tension spring (343) is rotatably disposed on one side of the detection plate (341), and the other end of the tension spring (343) is rotatably disposed on the monitoring chamber (3); A first marking area (4) is provided at one end of the observation axis (332); a second marking area (5) is provided on the observation axis (332) on one side of the first marking area (4), and both the first marking area (4) and the second marking area (5) are circumferentially arranged on the observation axis (332); the first marking area (4) contains a normal marking (41); the second marking area (5) is divided into a high temperature marking (51) and a flow interruption marking (52).

2. The chromatograph temperature monitoring device according to claim 1, characterized in that: The bottom of the sleeve (331) is provided with an unlocking structure (6), which includes a trigger block (61), an unlocking cavity (62), a locking pin (63), and an unlocking spring (64). One end of the unlocking cavity (62) is disposed in the wall of the bottom of the sleeve (331). One end of the trigger block (61) is slidably disposed at one end of the unlocking cavity (62), and the other end of the trigger block (61) is disposed inside the sleeve (331). The unlocking spring (64) is sleeved on the trigger block (61). 4) One end is fixedly set at the bottom of the sleeve (331), and the other end of the unlocking spring (64) is fixedly set at the other end of the trigger block (61); the locking pin (63) is slidably set at the other end of the unlocking cavity (62), and the bottom of the locking pin (63) is provided with an unlocking inclined surface (631); the unlocking inclined surface (631) of the locking pin (63) abuts against the trigger block (61); the adjusting port (321) is provided with a locking groove (3211), and the locking groove (3211) is used to cooperate with the locking pin (63) to slide and lock.

3. The chromatograph temperature monitoring device according to claim 1, characterized in that: A third marking structure (335) is provided inside the sliding rod (32) of the adjustment port (321). The third marking structure (335) includes a sliding cavity (3351), a driving cavity (3352), a marking cylinder (3353), a driving rod (3355), a driving piston (3356), and a return spring (3357). The sliding cavity (3351) is located in the wall of the side of the adjustment port (321). One end of the marking cylinder (3353) is slidably disposed in the sliding cavity (3351), and the other end of the marking cylinder (3353) is circumferentially provided with a composite marking (3354). The driving cavity (3352) is located inside the sliding rod (32) at the bottom of the adjustment port (321). The driving piston (3356) is slidably disposed within the driving cavity (3352); one end of the driving rod (3355) is fixedly disposed at one end of the driving piston (3356), and the other end of the driving rod (3355) passes through the bottom of the adjusting port (321) and is disposed within the adjusting port (321); the driving rod (3355) is slidably connected to the sliding rod (32), and the other end of the driving rod (3355) abuts against the sleeve (331); the return spring (3357) is sleeved on the driving rod (3355), and one end of the return spring (3357) is fixedly disposed at the other end of the driving rod (3355); the other end of the return spring (3357) is fixedly disposed at the bottom of the adjusting port (321).

4. The chromatograph temperature monitoring device according to claim 1, characterized in that: The heating assembly (8) includes a resistance heating film (81) and a micro switch (82); the resistance heating film (81) is disposed inside the column temperature chamber (1), and the micro switch (82) is disposed inside the other end of the monitoring chamber (3), and the micro switch (82) is connected to the resistance heating film (81).

5. The chromatograph temperature monitoring device according to claim 1, characterized in that: The circulating air-cooled assembly (9) includes a centrifugal fan (91), a filter (92), an air inlet (93), an air duct cavity (94), and a grille (95); the centrifugal fan (91) has an intake end (911) and an exhaust end (912) at both ends; the centrifugal fan (91) is fixedly installed on one side of the column temperature chamber (1), the intake end (911) of the centrifugal fan (91) is located inside the column temperature chamber (1), and the exhaust end (912) of the centrifugal fan (91) is located outside the column temperature chamber (1); the air duct cavity (94) is located in the column temperature chamber. (1) Inside the bottom wall; a negative pressure suction port (913) is provided on the side of the centrifugal fan (91), and the negative pressure suction port (913) is connected to one end of the air duct cavity (94); an air outlet (13) is provided at the bottom of the column temperature box (1), and the air outlet (13) is connected to the air duct cavity (94); a grille (95) is provided on the air outlet (13); an air inlet window (93) is provided on the other side of the column temperature box (1), and the air inlet window (93) is connected to the other end of the air duct cavity (94); a filter screen (92) is provided on the air inlet window (93).

6. The chromatograph temperature monitoring device according to claim 5, characterized in that: An observation window (35) is provided at the other end of the monitoring chamber (3); a replacement door (14) is provided on the column temperature box (1) above the air inlet window (93).

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