Silent column box for chromatographic analyzer based on heat pipe technology

Abstract

The utility model relates to a mute column box for a chromatographic analyzer based on a heat pipe technology. The device comprises a column box heat preservation shell, an electric heating block, a heating pipe set, a cooling separation type heat pipe set, cooling fins, a displacement tank, a coaxial lead screw stepping motor and an exhaust fan. Wherein the heating pipe group consists of a heat pipe, a heat transfer plate and a radiating fin; the cooling separation type heat pipe set is composed of a heat dissipation plate, heat pipes, a condenser, cooling fins, a displacement tank and a coaxial lead screw stepping motor. And the heating pipe group, the electric heating block and a heat dissipation plate of the cooling separation type heat pipe group are arranged in the column box heat preservation shell. Compared with the traditional chromatographic column box, the chromatographic column box has the advantage that the fan noise and vibration are obviously reduced by utilizing the advantages of high thermal conductivity, isothermal property and no need of external pumping power of the heat pipe. The performance and reliability of the chromatographic analyzer are improved, the column box can be rapidly heated and cooled, and special detection requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of chromatographic analyzers, and particularly relates to a silent column oven for a chromatographic analyzer based on heat pipe technology. Background Art

[0002] In current scientific research and industrial applications, chromatographic analysis technology plays a crucial role. Chromatographic analysis is a method for separating, identifying, and quantifying components in a mixture, and it has a wide range of applications in fields such as pharmaceutical research and development, environmental monitoring, food safety, petrochemical industry, etc.

[0003] Chromatographs are often equipped with a column oven to accommodate the chromatographic column, and the separation and detection of sample components are achieved through the internal flow of gas or liquid. To ensure the accuracy of analysis, the temperature inside the column oven must be kept uniform and stable. However, existing chromatographic column ovens usually equipped with fans to ensure temperature uniformity, which results in noise during operation. This noise not only affects the comfort of the laboratory environment but may also interfere with the accuracy of experimental results, especially for highly sensitive analysis methods. In certain specific situations, it is required that the chromatographic column oven can quickly raise and lower the temperature for detection, but the temperature control performance of existing chromatographic column ovens cannot meet this requirement.

[0004] A heat pipe is a heat transfer element. Inside the heat pipe, heat is mainly transferred by the vapor-liquid phase change of the working liquid, and the thermal resistance is very small, so it has a high heat conduction ability. The steam inside the heat pipe lumen is in a saturated state, so the heat pipe has excellent isothermal properties. When the heat pipe is placed horizontally, since the internal circulation power is capillary force, any end heated can be used as the evaporation section, and the other end dissipating heat outward becomes the condensation section. Compared with traditional fan or compressor-driven refrigeration systems, the heat pipe has the advantages of no mechanical movement, no noise, high heat conduction ability, isothermal properties, etc., so it has become an ideal choice for refrigeration and temperature control in chromatographic analyzers.

[0005] Therefore, it is necessary to propose a new design of the column oven for chromatographic analyzers, which uses heat pipe technology to achieve temperature control and uniformity inside the column oven, while reducing the noise and vibration of the fan, improving the performance and reliability of the chromatographic analyzer. And through the high heat conduction ability of the heat pipe, the function of quickly raising and lowering the temperature inside the column oven can be realized. The silent column oven involved in this patent is an innovative solution proposed for this demand. Summary of the Utility Model

[0006] The purpose of the utility model is to use heat pipe technology to achieve temperature control and uniformity inside the chromatographic column oven, while reducing the noise and vibration of the fan, improving the performance and reliability of the chromatographic analyzer. And through the high heat conduction ability of the heat pipe, the function of quickly raising and lowering the temperature inside the column oven can be realized, and a silent column oven for a chromatographic analyzer based on heat pipe technology is proposed.

[0007] The technical solution of the present utility model is realized as follows:

[0008] A silent column oven for a chromatograph analyzer based on heat pipe technology, comprising a column oven insulation shell, an electric heating block, a heating pipe group, a cooling and separating heat pipe group, a heat sink, a displacement tank, a coaxial screw stepper motor, and an exhaust fan; the heating pipe group is composed of a heat pipe, a heat transfer plate, and a heat sink; the cooling and separating heat pipe group is composed of a heat dissipation plate, a heat pipe, a condenser, a heat sink, a displacement tank, and a coaxial screw stepper motor; the heat dissipation plates of the heating pipe group, the electric heating block, and the cooling and separating heat pipe group are arranged inside the column oven insulation shell.

[0009] The further scheme is that the heat pipe of the heating pipe group is L-shaped, the evaporation section of the heat pipe is arranged inside the heat transfer plate, the condensation section of the heat pipe is close to the inner wall of the column oven, and heat sinks are arranged on the outer surface of the heat transfer plate in the heat pipe direction.

[0010] The further scheme is that the evaporation section of the heat pipe of the cooling and separating heat pipe group is vertically arranged inside the heat dissipation plate, a wick is arranged inside the evaporation section pipe of the heat pipe; the condenser is the condensation section of the cooling and separating heat pipe group, and the evaporation section of the heat pipe and the condenser are connected by upper and lower horizontal pipes; a pipe is provided at the bottom of the condenser to communicate with the displacement tank, and the displacement tank is fixed on the bottom plate and controlled by the coaxial screw stepper motor; a pipeline is provided at the top of the condenser for filling the working medium and evacuating, and the pipeline is sealed after the vacuum degree of the condenser is pumped to the working pressure.

[0011] The further scheme is that the condenser is set to be wider at the top and narrower at the bottom, and heat sinks are arranged on the outer surface of the condenser.

[0012] The further scheme is that heat sinks are arranged on the outer surface of the electric heating block, and an electric heating tube or a mica heating plate is arranged inside the electric heating block; a thermocouple is arranged inside the electric heating block to monitor the temperature.

[0013] The further scheme is that the heat transfer plate of the heating pipe group, the heat dissipation plate of the cooling and separating heat pipe group, and the electric heating block are arranged back to back in sequence.

[0014] The further scheme is that the working medium of the heat pipe of the heating pipe group is water or an organic co-solvent, etc., and the working temperature is 50 - 500 °C; the working medium of the heat pipe of the cooling and separating heat pipe group is acetone, freon, ammonia, or alcohol, etc., and the working temperature is 10 - 100 °C.

[0015] The further scheme is that an exhaust fan is arranged on the side panel of the condenser, and heat dissipation holes are arranged on the top panel of the condenser.

[0016] The further scheme is that multiple thermocouples are arranged inside the column oven to monitor the temperature inside the column oven.

[0017] Further, before the column oven is heated, the displacement tank is controlled by a coaxial lead screw stepper motor to pump the working fluid in the cooling and separating heat pipe group into the displacement tank, and the exhaust fan on the condenser side panel is in the closed state; when the column oven cools down, the electric heating block stops heating, and the displacement tank is controlled by the coaxial lead screw stepper motor to inject the working fluid in the displacement tank into the heat pipes of the cooling and separating heat pipe group, and the exhaust fan on the condenser side panel is opened; the volume of the displacement tank is equal to the volume of the working fluid required by the cooling and separating heat pipe group; the cooling and separating heat pipe group is provided with a pressure gauge to monitor its internal vacuum degree.

[0018] Further, this chromatographic silent column oven adopts an integrated design, and its control and monitoring functions such as temperature, pressure, and motor drive are integrated with the chromatograph analyzer control system to form a complete unit, which can directly replace the column oven part in the existing chromatograph analyzers on the market.

[0019] Advantages of the present utility model

[0020] 1. The chromatographic column oven of the present utility model utilizes the high thermal conductivity and isothermal property of the heat pipe, and heat dissipation fins are provided on the heat transfer plate of the heating pipe group, further ensuring the temperature uniformity in the column oven. This not only can improve the column efficiency of the chromatographic column, but also helps to ensure the repeatability of the analysis sample results.

[0021] 2. The heat conduction element of the chromatographic column oven of the present utility model is a heat pipe, and the heat pipe works without external pumping power. Therefore, compared with the traditional chromatographic column oven, the noise and vibration of the fan are reduced, and the performance and reliability of the chromatograph analyzer are improved.

[0022] 3. The cooling and separating heat pipe group of the present utility model is provided with a displacement tank to extract and transfer the working fluid of the cooling and separating heat pipe group to the displacement tank in advance during the heating process of the chromatographic column oven, so as to temporarily stop the operation of the cooling and separating heat pipe group.

[0023] 4. The chromatographic column oven of the present utility model utilizes the reversible heat conduction property and excellent heat conduction characteristics of the heat pipe to realize rapid temperature rise and fall in the column oven, so as to meet the need for rapid temperature rise and fall for detection in special cases. This function is especially suitable for scenarios of multiple rapid detections and is of great significance for ensuring detection accuracy and repeatability.

[0024] 5. The silent column oven of the present utility model adopts an integrated design and can be directly compatible with the existing chromatograph analyzers on the market without adjusting its appearance or internal structure. Its high adaptability means that the replacement cost is very small.

[0025] 6. The cooling and separating heat pipe group of the present utility model can be used for cooling explosion-proof or closed control cabinets, replacing the traditional cooling method of installing air conditioners in the control cabinets, and the cooling and separating heat pipe group works without external power and noise. Description of the drawings

[0026] Figure 1 Schematic diagram of a silent column oven for a chromatograph analyzer based on heat pipe technology according to the present utility model;

[0027] Figure 2 Schematic diagram of the silent column oven removing the column oven insulation shell according to the present utility model;

[0028] Figure 3 Side view of the silent column oven removing the column oven insulation shell according to the present utility model;

[0029] Figure 4 Schematic diagram of applying the cooling and separating heat pipe group to the temperature reduction of an explosion-proof or enclosed control cabinet according to the present utility model.

[0030] In the figure, 1 is the column oven insulation shell, 2 is the electric heating block, 3-1 is the heat pipe of the heating pipe group, 3-2 is the heat transfer plate, 3-3 is the heat sink, 4-1 is the heat pipe of the cooling and separating heat pipe group, 4-2 is the heat dissipation plate, 4-3 is the condenser, 4-4 is the coaxial screw stepper motor, 4-5 is the working medium filling port / vacuum pumping port, 4-6 is the heat sink, 4-7 is the displacement tank, 5 is the heat sink, 6 is the exhaust fan, 7 is the condenser side panel, 8 is the bottom plate, 9 is the explosion-proof or enclosed control cabinet, 3 is the heating heat pipe group, 4 is the cooling and separating heat pipe group.

[0031] The heating pipe group 3 includes: the heat pipe 3-1 of the heating pipe group, the heat transfer plate 3-2, and the heat sink 3-3.

[0032] The cooling and separating heat pipe group 4 includes: the heat pipe 4-1 of the cooling and separating heat pipe group, the heat dissipation plate 4-2, the condenser 4-3, the coaxial screw stepper motor 4-4, the working medium filling port / vacuum pumping port 4-5, the heat sink 4-6, and the displacement tank 4-7. Specific implementation manner

[0033] An embodiment of a silent column oven for a chromatograph analyzer based on heat pipe technology, as Figure 1 , Figure 2 , Figure 3 shown, the silent column oven for a chromatograph analyzer based on heat pipe technology includes a column oven insulation shell 1, an electric heating block 2, a heating pipe group 3, a cooling and separating heat pipe group 4, a heat sink 5, a displacement tank 4-7, a coaxial screw stepper motor 4-4, and an exhaust fan 6; the heating pipe group 3 is composed of a heat pipe 3-1, a heat transfer plate 3-2, and a heat sink 3-3; the cooling and separating heat pipe group 4 is composed of a heat dissipation plate 4-2, a heat pipe 4-1, a condenser 4-3, a heat sink 4-6, a displacement tank 4-7, and a coaxial screw stepper motor 4-4; the heating pipe group 3, the electric heating block 2, and the heat dissipation plate 4-2 of the cooling and separating heat pipe group are arranged in the column oven insulation shell 1.

[0034] In this embodiment, as Figure 1 , Figure 2 ,Figure 3 As shown, the heat pipe 3-1 of the heating pipe group is L-shaped. The evaporation section of the heat pipe is arranged in the heat transfer plate 3-2, the condensation section of the heat pipe is close to the inner wall of the column box, and heat dissipation fins 3-3 are provided on the outer surface of the heat transfer plate in the heat pipe direction.

[0035] In this embodiment, as Figure 1 , Figure 2 , Figure 3 shown, the evaporation section of the heat pipe of the cooling and separating heat pipe group 4 is arranged vertically in the heat dissipation plate 4-2, and a liquid absorption core is arranged in the pipe of the evaporation section of the heat pipe; the condenser 4-3 is the condensation section of the cooling and separating heat pipe group 4, and the evaporation section of the heat pipe and the condenser are connected by upper and lower horizontal pipes; a pipe is provided at the bottom of the condenser 4-3 to communicate with the displacement tank 4-7, and the displacement tank 4-7 is fixed on the bottom plate 8 and controlled by the coaxial screw stepping motor 4-4; a pipeline 4-5 is provided at the top of the condenser 4-3 for filling the working medium and evacuating, and the pipeline is sealed after the vacuum degree of the condenser is pumped to the working pressure.

[0036] In this embodiment, as Figure 1 , Figure 2 , Figure 3 shown, the condenser 4-3 is arranged to be wider at the top and narrower at the bottom, and heat dissipation fins 4-6 are provided on the outer surface of the condenser 4-3.

[0037] In this embodiment, as Figure 1 , Figure 2 , Figure 3 shown, heat dissipation fins 5 are provided on the outer surface of the electric heating block 2, and an electric heating tube or a mica heating plate is built in the electric heating block 2; a thermocouple is provided in the electric heating block to monitor the temperature.

[0038] In this embodiment, as Figure 1 , Figure 2 , Figure 3 shown, the working medium of the heat pipe 3-1 of the heating pipe group is water or an organic co-solvent, etc., and the working temperature is 50 - 500 °C; the working medium of the heat pipe 4-1 of the cooling and separating heat pipe group is acetone, freon, ammonia or alcohol, etc., and the working temperature is 10 - 100 °C.

[0039] In this embodiment, as Figure 1 , Figure 2 , Figure 3 shown, an exhaust fan 6 is provided on the side panel 7 of the condenser, and heat dissipation holes are provided on the top panel of the condenser.

[0040] In this embodiment, as Figure 1 , Figure 2 , Figure 3 shown, a plurality of thermocouples are arranged in the column box to monitor the temperature in the column box.

[0041] In this embodiment, as Figure 1 , Figure 2, Figure 3 As shown, before the column oven is heated, the coaxial screw stepper motor 4-4 is first used to control the displacement tank 4-7 to pump the working fluid in the cooling separated heat pipe group 4 into the displacement tank 4-7, and the exhaust fan 6 on the condenser side panel 7 is in the closed state; when the column oven cools down, the electric heating block 2 stops heating, and the coaxial screw stepper motor 4-4 is used to control the displacement tank 4-7 to inject the working fluid in the displacement tank 4-7 into the heat pipe 4-1 of the cooling separated heat pipe group, and the exhaust fan 6 on the condenser side panel 7 is opened; the volume of the displacement tank 4-7 is equal to the volume of the working fluid required by the cooling separated heat pipe group 4; the cooling separated heat pipe group 4 is provided with a pressure gauge to monitor its internal vacuum degree.

[0042] In this embodiment, as Figure 1 , Figure 2 , Figure 3 shown, the heat transfer plate 3-2 of the heating pipe group, the heat dissipation plate 4-2 of the cooling separated heat pipe group, and the electric heating block 2 are arranged back to back in sequence; when the column oven is heated, the heat of the electric heating block 2 is transferred to the heat transfer plate 3-2 through the heat dissipation plate 4-2, and the heat transfer plate 3-2 then transfers the heat to the evaporation section of the heat pipe 3-1 of the heating pipe group. When the temperature reaches the starting temperature of the heat pipe 3-1, the heat pipe starts to work. At this time, the heat pipes of the cooling separated heat pipe group 4 do not work. When the column oven cools down, the electric heating block 2 stops heating, and the heat in the column oven is transferred to the heat transfer plate 3-2 through the heat pipe 3-1 of the heating pipe group. The heat transfer plate 3-2 then transfers the heat to the electric heating block 2, and then to the heat dissipation plate 4-2. The heat pipe 4-1 of the cooling separated heat pipe group starts to work and quickly transfers the heat to the condenser 4-3, and is forced to dissipate heat through the heat sink 4-6 on the back of the condenser and the back panel exhaust fan 6.

[0043] As Figure 4 shown, the cooling separated heat pipe group 4 of the present utility model can be used for cooling explosion-proof or enclosed control cabinets 9, replacing the traditional cooling method of installing air conditioners in the control cabinets, and the cooling separated heat pipe group 4 works without external power and without noise. The installation form of the cooling separated heat pipe group 4 for the explosion-proof or enclosed control cabinet 9 is not limited to Figure 4 shown in.

[0044] Of course, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above examples. Changes made by those skilled in the art within the essence of the present utility model also belong to the protection scope of the present utility model.

Claims

1. A silent column box for a chromatographic analyzer based on heat pipe technology, characterized in that: It includes a column box insulation shell, an electric heating block, a heating tube group, a cooling separation type heat pipe group, a heat sink, a displacement tank, a coaxial screw stepper motor, and an exhaust fan; the heating tube group is composed of a heat pipe, a heat transfer plate and a heat sink; the cooling separation type heat pipe group is composed of a heat sink, a heat pipe, a condenser, a heat sink, a displacement tank, and a coaxial screw stepper motor; the heating tube group, the electric heating block, and the heat sink of the cooling separation type heat pipe group are arranged in the column box insulation shell.

2. According to claim 1, a silent column box for a chromatographic analyzer based on heat pipe technology, characterized in that: The heat pipe of the heating tube group is L-shaped, the evaporation section of the heat pipe is arranged in the heat transfer plate, the condensation section of the heat pipe is close to the inner wall of the column box, and the outer surface of the heat transfer plate in the direction of the heat pipe is provided with a heat sink.

3. According to claim 1, a silent column box for a chromatographic analyzer based on heat pipe technology, characterized in that: The evaporation section of the heat pipe of the cooling separation heat pipe group is vertically arranged in the heat dissipation plate, and the liquid absorption core is arranged in the evaporation section of the heat pipe; the condenser is the condensation section of the cooling separation heat pipe group, and the evaporation section of the heat pipe and the condenser are connected by upper and lower horizontal pipes; a pipe is provided at the bottom of the condenser to be connected with the displacement tank, and the displacement tank is fixed on the bottom plate and controlled by a coaxial screw stepper motor; a pipeline is provided on the top of the condenser for filling the working medium and evacuating the vacuum.

4. According to claim 1, a silent column box for a chromatographic analyzer based on heat pipe technology, characterized in that: The condenser is configured to be wide at the top and narrow at the bottom, and a heat sink is provided on the outer surface of the condenser.

5. The silent column box for a chromatographic analyzer based on heat pipe technology according to claim 1, characterized in that: The outer surface of the electric heating block is provided with a heat sink, and the electric heating block is internally provided with an electric heating tube or a mica heating plate; and a thermocouple is provided inside the electric heating block to monitor the temperature.

6. The silent column box for a chromatographic analyzer based on heat pipe technology according to claim 1, characterized in that: The heat transfer plate of the heating pipe group, the heat dissipation plate of the cooling separation heat pipe group, and the electric heating block are arranged back to back in sequence.

7. The silent column box for a chromatographic analyzer based on heat pipe technology according to claim 1, characterized in that: The heat pipe working fluid of the heating pipe group is water or an organic eutectic, etc., and the working temperature is 50-500°C; the heat pipe working fluid of the cooling separation heat pipe group is acetone, Freon, ammonia or alcohol, etc., and the working temperature is 10-100°C.

8. The silent column box for a chromatographic analyzer based on heat pipe technology according to claim 1, characterized in that: An exhaust fan is arranged on the side panel of the condenser, and a heat dissipation hole is arranged on the top panel of the condenser.

9. The silent column box for a chromatographic analyzer based on heat pipe technology according to claim 1, characterized in that: A plurality of thermocouples are arranged in the column box to monitor the temperature in the column box.

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