Sample gas circulation device of gas chromatograph

Abstract

The utility model discloses a sample gas circulation device of a gas chromatograph. The sample gas circulation device comprises a base and an electric push rod, a resistance wire is fixedly mounted on the inner side of the ceramic plate; a sample bottle is movably placed at the top end of the ceramic plate; a bottle body valve is fixedly mounted on the side wall of the top end of the sample bottle; an electric push rod is fixedly mounted on the left side of the top end of the base; a connecting rod is fixedly mounted at the bottom of the top plate, the bottom of the connecting rod is fixedly connected with the outer wall above a gas conveying pipe, a rubber ring is fixedly mounted at the lower end of the gas conveying pipe, and a front valve is fixedly mounted on the side wall of the gas conveying pipe above the rubber ring; by arranging the ceramic plate and the resistance wire, gas can be preheated in advance, so that the gas is heated to rise, the gas can be better guided into the chromatograph, and the circulation efficiency is relatively high.

Description

Technical Field

[0001] This application relates to the technical field of gas circulation, and specifically to a sample gas circulation device for a gas chromatograph. Background Technique

[0002] A gas chromatograph is an instrument that uses chromatographic separation technology and detection technology to qualitatively and quantitatively analyze complex mixtures of multiple components. It is mainly used to analyze organic substances in soil that are thermally stable and have a boiling point not exceeding 500 °C, such as volatile organic compounds, organochlorines, organophosphorus, polycyclic aromatic hydrocarbons, phthalic acid esters, etc. During use, the analysis gas needs to flow into the interior of the instrument. Existing circulation equipment cannot introduce the gas well and has low efficiency.

[0003] Patent No. 202121032598.4 discloses a sample gas circulation device for a gas chromatograph, including a gas guide pipe, a pressure plate, an exhaust pipe, a valve, a support plate, a connecting plate, a vertical rod, a manual suction cup, etc. By setting a pressure plate, a rubber ring and an exhaust valve, the sealed connection between the sample bottle and the gas guide pipe is realized. By setting a valve, the opening of the sample bottle is controlled. By setting a support plate, a lead screw, a lead screw sleeve and a bottom plate, a lifting unit is formed to realize the up and down movement of the sample bottle. By setting a manual suction cup, the connection between the lifting unit and the main body of the gas chromatograph is realized. By setting two cooperating clamping plates, a screw rod and a baffle, the fixation of the sample bottle is realized. The structure of the utility model is simple and easy to use, and solves the problem that the existing gas circulation equipment has an overly complex structure and is very inconvenient to use.

[0004] However, in use, it has the following defects:

[0005] Although a vacuum valve is used to keep the exhaust pipe in a vacuum state, so that the gas in the sample bottle can be sucked out at one time after the valve is opened, the intake speed cannot be guaranteed, and the gas in the exhaust pipe may also return, thus affecting the actual use efficiency of the device. Utility Model Content

[0006] The purpose of this application is to provide a sample gas circulation device for a gas chromatograph, which solves the problem that although a vacuum valve is used to keep the exhaust pipe in a vacuum state in the background technique, so that the gas in the sample bottle can be sucked out at one time after the valve is opened, the intake speed cannot be guaranteed, and the gas in the exhaust pipe may also return, thus affecting the actual use efficiency of the device.

[0007] To achieve the above object, the present application provides the following technical solution: A sample gas circulation device for a gas chromatograph, comprising a base, an electric push rod, an air delivery pipe, a filter screen, and an exhaust fan. A ceramic plate is inlaid and installed on the right side of the top of the base. A heating wire is fixedly installed inside the ceramic plate. A sample bottle is placed on the top of the ceramic plate in a movable manner. A bottle valve is fixedly installed on the side wall of the top of the sample bottle. An electric push rod is fixedly installed on the left side of the top of the base. A top plate is fixedly installed at the top of the electric push rod. A connecting rod is fixedly installed at the bottom of the top plate. The bottom of the connecting rod is fixedly connected to the upper outer wall of the air delivery pipe. A rubber ring is fixedly installed at the lower end of the air delivery pipe. A front valve is fixedly installed on the side wall of the air delivery pipe above the rubber ring.

[0008] In this technical solution, the sample bottle is placed on the ceramic plate at the top of the base. The electric push rod is started to drive the connecting rod and the air delivery pipe to descend, so that the rubber ring at the bottom of the air delivery pipe can wrap the top of the sample bottle to ensure airtightness. Through the power supply interface, the ceramic plate, and the heating wire, the gas in the sample bottle can be preheated. The resistance value of the heating wire is small, so the temperature is relatively low after being energized, and only the bottle body will be slightly heated. The gas in the sample bottle will move upward actively after being heated. In this way, when the bottle valve is opened, the gas can enter the air delivery pipe more efficiently, thus improving the gas circulation efficiency of the device. At the same time, through the front valve and the rear valve, the air intake speed of the gas can be controlled. The rear valve is normally kept closed. After the gas in the sample bottle enters the air delivery pipe, the front valve is immediately closed. At this time, the gas will exist in the air delivery pipe between the front valve and the rear valve. The opening degree of the rear valve is adjusted according to the needs, so as to control the air intake rate of the gas and prevent the gas from flowing back, improving the practicability of the device. To prevent gas residue, the exhaust fan and the auxiliary valve can also be opened, and air is drawn into the air delivery pipe through the auxiliary pipe, so as to discharge the residual gas, so as not to affect the intake of other gases subsequently. The filter screen can absorb and block the water vapor and dust brought in by the exhaust fan to ensure the purity of the gas.

[0009] As an optional solution of the technical solution of the present application, an exhaust fan is movably installed at the top of the top plate. The bottom of the exhaust fan is movably connected and communicated with one end of the auxiliary pipe. The other end of the auxiliary pipe is fixedly connected and communicated with the side wall of the air delivery pipe.

[0010] As an optional solution of the technical solution of the present application, a power supply interface is fixedly installed at the lower part of the front side wall of the base. An operation panel is fixedly installed on the front side wall of the base on the right side of the power supply interface.

[0011] As an optional solution of the technical solution of the present application, a filter screen is fixedly installed inside the air delivery pipe. A rear valve is fixedly installed on the side wall of the air delivery pipe on the right side of the filter screen.

[0012] As an alternative embodiment of the technical solution of the present application, the rubber ring is movably and contactingly connected to the top of the sample bottle.

[0013] Compared with the prior art, the beneficial effects of the present application are as follows:

[0014] 1. In the present application, through the power interface, the ceramic disc, and the resistance wire, the gas in the sample bottle can be preheated. The resistance value of the resistance wire is small, so the temperature is relatively low after being energized, and only the bottle body is slightly heated. After the gas in the sample bottle is heated, it will actively move upward in the bottle body. In this way, when the valve of the bottle body is opened, the gas can enter the gas pipeline more efficiently, thereby improving the gas flow efficiency of the device.

[0015] 2. In the present application, through the front valve and the rear valve, the intake speed of the gas can be controlled. The rear valve is normally kept closed. After the gas in the sample bottle enters the gas pipeline, the front valve is immediately closed. At this time, the gas will exist in the gas pipeline between the front valve and the rear valve. The opening degree of the rear valve is adjusted according to requirements, thereby controlling the intake rate of the gas and preventing the gas from flowing back, improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0017] Figure 1 is a schematic diagram of the overall structure of a sample gas flow device for a gas chromatograph according to the present application;

[0018] Figure 2 is a schematic top view of the base of a sample gas flow device for a gas chromatograph according to the present application.

[0019] In the figure: 1, base; 2, power interface; 3, operation panel; 4, ceramic disc; 5, resistance wire; 6, sample bottle; 601, bottle valve; 7, electric push rod; 8, top plate; 9, connecting rod; 10, gas pipeline; 101, front valve; 102, rear valve; 11, rubber ring; 12, exhaust fan; 13, auxiliary pipeline; 131, auxiliary valve; 14, filter screen. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the technical means, creative features, achieved purposes, and functions of the present utility model easy to understand, the following further elaborates with reference to specific embodiments.

[0021] As Figure 1As shown in the figure, a sample gas flow device for a gas chromatograph includes a base 1, an electric push rod 7, an air delivery pipe 10, a filter screen 14, and an exhaust fan 12. A sample bottle 6 is placed on the top of a ceramic plate 4 in a movable manner. A bottle valve 601 is fixedly installed on the top side wall of the sample bottle 6. The top of the electric push rod 7 is fixedly installed with a top plate 8. The bottom of the top plate 8 is fixedly installed with a connecting rod 9. The bottom of the connecting rod 9 is fixedly connected to the outer wall above the air delivery pipe 10. A rubber ring 11 is fixedly installed at the lower end of the air delivery pipe 10. The rubber ring 11 is in movable contact with the top of the sample bottle 6.

[0022] As Figure 1 shown in the figure, an exhaust fan 12 is movably installed on the top of the top plate 8. The bottom of the exhaust fan 12 is movably connected and communicated with one end of a secondary pipe 13. The other end of the secondary pipe 13 is fixedly connected and communicated with the side wall of the air delivery pipe 10. A secondary valve 131 is fixedly installed on the side wall of the secondary pipe.

[0023] As Figure 1 shown in the figure, a power interface 2 is fixedly installed below the front side wall of the base 1. An operation panel 3 is fixedly installed on the front side wall of the base 1 to the right of the power interface 2. After the power interface 2 is externally connected to a circuit, it supplies power to the device.

[0024] As Figure 1 shown in the figure, a front valve 101 is fixedly installed on the side wall of the air delivery pipe 10 above the rubber ring 11. A filter screen 14 is fixedly installed inside the air delivery pipe 10. A rear valve 102 is fixedly installed on the side wall of the air delivery pipe 10 to the right of the filter screen 14. The filter screen 14 can block dust and water vapor.

[0025] As Figure 1 and Figure 2 shown in the figure, a ceramic plate 4 is inlaid and installed on the top right side of the base 1. A heating wire 5 is fixedly installed inside the ceramic plate 4. An electric push rod 7 is fixedly installed on the top left side of the base 1. The ceramic plate 4 can conduct heat better.

[0026] In actual use, place the sample bottle 6 on the ceramic plate 4 at the top of the base 1. Start the electric push rod 7 to drive the connecting rod 9 and the air delivery pipe 10 to descend, so that the rubber ring 11 at the bottom of the air delivery pipe 10 can wrap around the top of the sample bottle 6 to ensure airtightness. Through the power supply interface 2, the ceramic plate 4, and the resistance wire 5, the gas in the sample bottle 6 can be preheated. The resistance value of the resistance wire 5 is relatively small, so the temperature is relatively low after being energized, and only the bottle body will be slightly heated. After the gas in the sample bottle 6 is heated, it will actively move upward in the bottle body. In this way, when the bottle body valve 601 is opened, the gas can enter the air delivery pipe 10 more efficiently, thereby improving the gas flow efficiency of the device. At the same time, through the front valve 101 and the rear valve 102, the air intake speed of the gas can be controlled. The rear valve 102 normally remains closed. After the gas in the sample bottle 6 enters the air delivery pipe 10, immediately close the front valve 101. At this time, the gas will exist in the air delivery pipe 10 between the front valve 101 and the rear valve 102. Adjust the opening degree of the rear valve 102 according to the needs, thereby controlling the air intake rate of the gas and preventing gas backflow, improving the practicability of the device. To prevent gas residue, the exhaust fan 12 and the auxiliary valve 131 can also be opened, and air is drawn into the air delivery pipe 10 through the auxiliary pipe 13, so as to discharge the residual gas, so as not to affect the intake of other subsequent gases. The filter screen 14 can absorb and block the water vapor and dust brought in by the exhaust fan 12 to ensure the purity of the gas.

Claims

1. A gas chromatograph sample gas circulation device, comprising a base (1), an electric push rod (7), a gas transmission pipe (10), a filter (14) and an exhaust fan (12), characterized in that: A ceramic disk (4) is inlaid and installed on the right side of the top of the base (1), a resistance wire (5) is fixedly installed on the inner side of the ceramic disk (4), a sample bottle (6) is movably placed on the top of the ceramic disk (4), a bottle body valve (601) is fixedly installed on the top side wall of the sample bottle (6), an electric push rod (7) is fixedly installed on the left side of the top of the base (1), a top plate (8) is fixedly installed on the top of the electric push rod (7), a connecting rod (9) is fixedly installed on the bottom of the top plate (8), the bottom of the connecting rod (9) is fixedly connected to the upper outer wall of the gas pipe (10), a rubber ring (11) is fixedly installed on the lower end of the gas pipe (10), and a front valve (101) is fixedly installed on the side wall of the gas pipe (10) above the rubber ring (11).

2. A gas chromatograph sample gas flow device according to claim 1, characterized in that: An exhaust fan (12) is movably mounted on the top of the top plate (8), the bottom of the exhaust fan (12) is movably connected to and communicated with one end of a secondary pipeline (13), and the other end of the secondary pipeline (13) is fixedly connected to and communicated with the side wall of the gas supply pipe (10).

3. A gas chromatograph sample gas flow device according to claim 1, characterized in that: A power interface (2) is fixedly mounted below the front side wall of the base (1), and an operation panel (3) is fixedly mounted on the front side wall of the base (1) on the right side of the power interface (2).

4. A gas chromatograph sample gas flow device according to claim 1, characterized in that: A filter screen (14) is fixedly installed on the inner side of the gas delivery pipe (10), and a rear valve (102) is fixedly installed on the side wall of the gas delivery pipe (10) on the right side of the filter screen (14).

5. The gas chromatograph sample gas flow device according to claim 1, characterized in that: The rubber ring (11) is movably connected to the top of the sample bottle (6).

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