Constant-temperature column box for online chromatographic instrument

Abstract

The constant-temperature column box comprises a shell, a connecting frame is fixedly connected to the bottom of the shell, holes are uniformly formed in the connecting frame, a sealing cover is assembled on the top of the shell, a fixing frame is assembled in the center of the connecting frame, and a heating assembly is assembled in an inner cavity of the shell. A heater in the heating assembly adopts an assembling mode that an assembling frame is matched with an assembling groove, the heater is annularly assembled in an inner cavity of the shell, the inner cavity of the shell can be better heated, a chromatographic column is more uniformly heated in the inner cavity of the shell, and meanwhile, due to the fact that a circulating groove and a circulating hole are formed in an elastic clamping body of a fixing frame, the heating effect of the chromatographic column is improved. When the temperature of the chromatographic column needs to be regulated and controlled, cold air can pass through the circulating grooves and the circulating holes, and the heat exchange area between the chromatographic column and the cold air is enlarged, so that the cooling efficiency of the chromatographic column is improved, and the temperature interval of the chromatographic column is regulated more quickly in the process of analyzing a sample by a chromatograph.

Description

Technical Field

[0001] This utility model relates to the field of chromatography technology, specifically to a constant temperature column oven for an online chromatography instrument. Background Technology

[0002] A column oven is a crucial device for controlling the temperature of a chromatographic column during chromatographic analysis. It provides a constant and uniform temperature environment, ensuring the accuracy and repeatability of the analysis. A typical column oven design includes a heated chamber where the column is placed, and a built-in temperature control system regulates the temperature within the chamber to control the column temperature. Most existing column ovens use a holder to fix the column in the heated chamber. The large contact area between the holder and the column means that when the chromatograph needs to cool the column for analysis, the cold air entering the heated chamber cannot effectively exchange heat with the column, resulting in low cooling efficiency and an inability to quickly adjust the column to the required temperature range. Therefore, we propose a constant-temperature column oven for online chromatographs. Utility Model Content

[0003] The purpose of this invention is to provide a constant temperature column oven for online chromatographs to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a constant temperature column oven for an online chromatograph, comprising a shell, a connecting frame fixedly connected to the bottom of the shell, openings evenly distributed inside the connecting frame, a cover fitted to the top of the shell, a fixing frame fitted to the center of the connecting frame, and a heating assembly fitted to the inner cavity of the shell.

[0005] The fixing frame includes a support body, the bottom of which is fixedly connected with a connecting bolt, and an elastic clamping body is fixedly connected to the side wall of the support body. The inner side wall of the elastic clamping body is uniformly provided with flow grooves, and the side wall of the flow groove is uniformly provided with flow holes penetrating the elastic clamping body.

[0006] Preferably, the heating component includes an assembly groove integrally formed on the inner cavity sidewall of the housing, an assembly frame is inserted into the assembly groove, and a heater is fixedly mounted on the sidewall of the assembly frame.

[0007] Preferably, the number of the assembly slots, assembly racks and heaters is at least three sets, and the three sets of assembly slots, assembly racks and heaters are evenly distributed in a circular pattern within the housing.

[0008] Preferably, a heat insulation layer is assembled between the mounting frame and the housing.

[0009] Preferably, the side wall of the housing has a rectangular groove, and the side wall of the heat insulation layer has a connection hole corresponding to the position of the rectangular groove.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: An online chromatograph uses a constant temperature column oven. Compared with traditional column ovens, this utility model firstly redesigns the heating assembly inside the shell and the fixing frame for fixing the chromatographic column. The heater inside the heating assembly adopts an assembly method that combines the mounting frame and the mounting groove, assembling the heater in a ring shape within the inner cavity of the shell. This allows for better heating of the inner cavity of the shell, resulting in more uniform heating of the chromatographic column within the shell. Simultaneously, because a flow groove and a flow hole are provided within the elastic clamp of the fixing frame, when temperature control of the chromatographic column is required, cold air can pass through the flow groove and the flow hole, increasing the heat exchange area between the chromatographic column and the cold air, thereby improving the cooling efficiency of the chromatographic column and enabling the chromatographic instrument to adjust the column temperature range more rapidly during sample analysis. Attached Figure Description

[0011] Figure 1 This is a perspective view of the present invention.

[0012] Figure 2 This is a partial cross-sectional view of the present invention.

[0013] Figure 3 This is a structural schematic diagram of the fixing frame and connecting frame of this utility model.

[0014] Figure 4 This is a schematic diagram of the structure of the fixing frame of this utility model.

[0015] Figure 5 This is a schematic diagram of the assembly frame and heater of this utility model.

[0016] Figure 6 This is a schematic diagram of the exploded structure of this utility model.

[0017] In the diagram: 1. Shell; 2. Connecting frame; 21. Opening; 3. Cover; 4. Fixing frame; 41. Support body; 42. Connecting bolt; 43. Elastic clamping body; 44. Flow groove; 45. Flow hole; 5. Heating component; 51. Assembly groove; 52. Assembly frame; 53. Heater; 6. Insulation layer; 7. Rectangular groove; 8. Connecting hole. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 This utility model provides a technical solution: a constant temperature column oven for an online chromatograph, including a shell 1, a connecting frame 2 welded and fixed to the bottom of the shell 1, and an assembly hole circumferentially opened on the side wall of the connecting frame 2. By screwing the fixing bolt in the assembly hole, the connecting frame 2 and the shell 1 can be detachably fixed to the side wall of the chromatograph. A cover 3 is detachably fixed to the top of the shell 1 by fixing screws, and the top of the shell 1 is closed by the cover 3.

[0020] like Figure 2 As shown, a fixing frame 4 is assembled in the middle of the connecting frame 2. The fixing frame 4 is used to clamp and fix the chromatographic column in the center of the housing 1. The fixing frame 4 has been redesigned in this utility model so that the chromatographic column can be heated and cooled quickly when the temperature is controlled in the column oven, which facilitates heat exchange in the inner cavity of the housing 1 and improves the efficiency of chromatographic column temperature control.

[0021] like Figure 3 and Figure 4 As shown, the mounting bracket 4 includes a support body 41. A connecting bolt 42 is welded to the bottom of the support body 41. The support body 41 and the mounting bracket 2 can be detachably and fixedly connected by screwing the connecting bolt 42 to the center of the mounting bracket 2. An elastic clamping body 43 is welded to the side wall of the support body 41. The elastic clamping body 43 is made of a metal material with a certain elasticity and has an arc-shaped end to clamp and fix the chromatographic column. The inner side wall of the elastic clamping body 43 is uniformly provided with flow grooves 44. The side wall of the flow grooves 44 is uniformly provided with flow holes 45 that penetrate the elastic clamping body 43. By setting the flow grooves 44 and flow holes 45, the contact area between the chromatographic column and the hot air and cold air can be increased during the heat exchange of the chromatographic column, thereby enhancing the heat exchange efficiency of the chromatographic column in the mounting bracket 4 and making the chromatographic instrument adjust the temperature of the chromatographic column more quickly.

[0022] The bottom of the connecting frame 2 is evenly provided with openings 21, which are used for the air circulation inside the housing 1 to facilitate the cooling operation of the chromatographic column inside the housing 1.

[0023] like Figure 2 and Figure 5 As shown, a heating component 5 is installed in the inner cavity of the housing 1. The heating component 5 can heat the chromatographic column installed in the inner cavity of the housing 1 according to the temperature requirements of the chromatograph during use.

[0024] The heating assembly 5 includes an assembly slot 51, which is integrally formed on the inner cavity sidewall of the housing 1. An assembly frame 52 is slidably connected in the assembly slot 51. The assembly slot 51 is used for assembling and positioning the assembly frame 52. A heater 53 is fixedly mounted on the inner sidewall of the assembly frame 52. The heater 53 is electrically connected to the power supply and controller in the chromatograph. During use, the chromatograph can adjust the heating temperature of the heater 53 as needed to keep the chromatographic column in the housing 1 at a constant temperature. The number of assembly slots 51, assembly frames 52 and heaters 53 is at least three sets. The three sets of assembly slots 51, assembly frames 52 and heaters 53 are evenly arranged in a circle, so that the heaters 53 mounted on the sidewall of the assembly frame 52 heat the inner cavity of the housing 1 in a ring, improving the heating efficiency of the inner cavity of the housing 1. The heaters 53 are assembled by the mutual cooperation of the assembly frame 52 and the assembly slot 51, which facilitates the disassembly of the assembly frame 52 from the housing 1 and makes it convenient to repair and maintain the heaters 53.

[0025] like Figure 6 As shown, a heat insulation layer 6 is installed between the mounting frame 52 and the housing 1. The heat insulation layer 6 can be replaced to keep the inside of the housing 1 warm, which facilitates the increase of the temperature inside the housing 1. The heat insulation layer 6 is made of aluminum silicate material with low thermal conductivity, which has good heat insulation performance, high stability, and is non-toxic and harmless, and will not contaminate the sample. The side wall of the housing 1 has rectangular grooves 7 that are symmetrically distributed around the center of the housing 1. The side wall of the heat insulation layer 6 has connection holes 8 that correspond to the positions of the rectangular grooves 7. The connection holes 8 are used for the passage of pipelines connected to the chromatographic column, which facilitates the supply of the sample to be tested from the external environment to the chromatographic column during the use of the chromatograph.

[0026] Working principle: When using this column oven in conjunction with a chromatograph, the connecting frame 2 and the housing 1 are assembled and fixed to the chromatograph using fixing bolts. Then, the chromatographic column is snapped into the fixing frame 4, and the fixing frame 4 is screwed on to connect and fix it to the connecting frame 2. The assembly frame 52 and the heater 53 are then inserted and assembled along the position of the assembly groove 51. Then, the chromatograph's tubing passes through the heat insulation layer 6 and the rectangular groove 7 and connects to the sample supply tubing inside the chromatograph. When detecting samples, the chromatograph can control the heater 53 to heat the inner cavity of the housing 1 and the chromatographic column assembled in the inner cavity according to the temperature requirements. When it is necessary to cool the chromatographic column, the chromatograph controls cold air to enter through the opening 21 to complete the circulation of cold air in the housing 1. Due to the redesign of the fixing frame 4 for fixing the chromatographic column, the side wall of the elastic clamp 43 is evenly provided with flow grooves 44 and flow holes 45, which can be replaced to allow heat exchange between the cold air and the chromatographic column, improving the cooling efficiency of the chromatographic column and enabling the chromatographic column to quickly reach the temperature required for chromatograph testing.

Claims

1. A constant temperature column oven for an online chromatograph, comprising a housing (1), characterized in that: The bottom of the housing (1) is fixedly connected to a connecting frame (2), and the connecting frame (2) is evenly provided with openings (21). The top of the housing (1) is fitted with a cover (3), and the center of the connecting frame (2) is fitted with a fixing frame (4). The inner cavity of the housing (1) is fitted with a heating component (5). The fixing frame (4) includes a support body (41), the bottom of the support body (41) is fixedly connected with a connecting bolt (42), the side wall of the support body (41) is fixedly connected with an elastic clamping body (43), the inner side wall of the elastic clamping body (43) is uniformly provided with a flow groove (44), and the side wall of the flow groove (44) is uniformly provided with a flow hole (45) penetrating the elastic clamping body (43).

2. The constant temperature column oven for an online chromatograph according to claim 1, characterized in that: The heating assembly (5) includes an assembly groove (51), which is integrally formed on the inner cavity side wall of the housing (1). An assembly frame (52) is inserted into the assembly groove (51), and a heater (53) is fixedly mounted on the side wall of the assembly frame (52).

3. The constant temperature column oven for an online chromatograph according to claim 2, characterized in that: The number of the assembly slots (51), assembly racks (52) and heaters (53) is at least three sets, and the three sets of assembly slots (51), assembly racks (52) and heaters (53) are evenly distributed in a circle within the housing (1).

4. The constant temperature column oven for an online chromatograph according to claim 3, characterized in that: A heat insulation layer (6) is assembled between the assembly frame (52) and the shell (1).

5. The constant temperature column oven for an online chromatograph according to claim 4, characterized in that: The side wall of the housing (1) is provided with a rectangular groove (7), and the side wall of the heat insulation layer (6) is provided with a connecting hole (8) corresponding to the position of the rectangular groove (7).

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