CN113702528B

CN113702528B - Gas chromatograph

Info

Publication number: CN113702528B
Application number: CN202110991829.2A
Authority: CN
Inventors: 汪桂珍; 侯长辉; 皮松兵; 吴行; 曾德恩
Original assignee: Shenzhen Huakeda Testing Co ltd
Current assignee: Shenzhen Huakeda Testing Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2023-03-24
Anticipated expiration: 2041-08-27
Also published as: CN113702528A

Abstract

The application relates to the technical field of detection equipment, and provides a gas chromatograph aiming at the problem that the temperature reduction efficiency of a column oven of the traditional gas chromatograph is low, wherein the gas chromatograph comprises a gas chromatograph body, a fan is installed in the column oven of the gas chromatograph body, the column oven of the gas chromatograph body is communicated with an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are communicated with the outside, the air outlet pipe is opposite to the fan, and the gas chromatograph body is also provided with a closing component for closing the air outlet pipe and the air inlet pipe; the gas chromatograph is also provided with a water tank for storing cooling water outside the gas chromatograph body, a cooling pipe is further arranged in the column oven, the two ends of the cooling pipe are respectively communicated with a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe are both communicated with the water tank, and the water inlet pipe is also connected with a main water pump in series. This application has the effect of promoting post incubator cooling efficiency.

Description

Gas chromatograph

Technical Field

The application relates to the technical field of detection equipment, in particular to a gas chromatograph.

Background

The gas chromatograph is an instrument for qualitatively and quantitatively analyzing a multi-component complex mixture by using a chromatographic separation technology and a detection technology. It is generally used to analyze various organic substances in daily life to determine their main components.

The gas chromatograph comprises a shell, wherein the shell is provided with a sample injector, a column incubator, a detector, a chromatographic column and other components, and a temperature control assembly for heating and cooling is arranged in the column incubator. When the gas chromatograph is used, a chromatographic column is placed into a column incubator, two ends of the chromatographic column are respectively communicated with a sample injector and a detector, a detection sample is placed into the sample injector, a carrier gas input by a carrier gas source enables the sample in the sample injector to be brought into the chromatographic column, the chromatographic column is heated and heated through a temperature control assembly, the sample in the chromatographic column is gasified and separated, the subsequently separated sample flows into the detector, and all components are detected through the detector.

In the related art, the temperature control assembly includes a temperature sensor and an electric heating wire disposed in a column oven. The column incubator is further provided with an air inlet and an air outlet, the fan and the heating wire are matched to realize convection heat transfer during warming, further, heating of the chromatographic column in the column incubator is realized, during cooling, the air outlet and the air inlet are opened, heat in the column incubator is taken out of the air outlet through the fan, and cooling of the column incubator is realized.

Because the boiling point difference of the components in the sample is usually larger, the direct use of higher temperature generally can cause incomplete separation of the components with low boiling points in the sample, and when the sample is detected, the initial temperature and the highest temperature clothes are usually set according to the type of the sample, and then the temperature is gradually increased through the temperature control component, so that the components in the sample are separated; after the detection of one set of samples is completed, before the detection of the next set of samples is performed, the detection of the next set of samples is generally performed after the temperature in the column incubator is reduced to the initial temperature, so as to ensure that the samples in the chromatogram can be better separated.

With respect to the above-described related art, the inventors consider that the following drawbacks exist: at present column incubator cooling, the heat through the fan in with column incubator is taken out to the external world usually, singly relies on a set of fan heat dissipation, and often efficiency is limited, and column incubator's temperature drops to initial temperature and usually needs longer time, and column incubator's cooling efficiency is lower, leads to next a set of sample test time extension. Therefore, there is room for improvement.

Disclosure of Invention

In order to improve the cooling efficiency of gas chromatograph column oven, this application provides a gas chromatograph.

The application provides a gas chromatograph, adopts following technical scheme:

a gas chromatograph comprises a gas chromatograph body, wherein a fan is installed in a column oven of the gas chromatograph body, the column oven of the gas chromatograph body is communicated with an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are both communicated with the outside, the air outlet pipe is opposite to the fan, and the gas chromatograph body is further provided with a closing and opening assembly used for closing the air outlet pipe and the air inlet pipe; this external water tank that still is provided with the storage cooling water of gas chromatograph, still be provided with the cooling tube in the column incubator, the cooling tube both ends communicate respectively has inlet tube and outlet pipe, inlet tube and outlet pipe all communicate with the water tank, the inlet tube still is established ties there is main water pump.

By adopting the technical scheme, when the column incubator is cooled, the opening and closing assembly is opened, so that the air inlet pipe and the air outlet pipe are communicated with the outside, and the fan is started to discharge the heat in the column incubator to the outside of the air outlet pipe; start main water pump, take the cooling water in the water tank out through main water pump, via the inlet tube, flow back to the water tank behind cooling tube and the outlet pipe, realize the circulation flow of cooling water, utilize the cooling water at the intraductal in-process that flows of cooling, absorb the heat in the column incubator, utilize cooling water circulation flow heat absorption and fan heat dissipation two kinds of modes together to cool down the column incubator, be favorable to improving the cooling effect of column incubator, make the temperature in the column incubator can get back to initial temperature more fast, thereby make gas chromatograph can carry out the detection of next sample more fast.

Preferably, it includes two sets of counter weight closing plates to lead to the subassembly of closing, and is two sets of the counter weight closing plate slides respectively and pegs graft in the bottom pipe wall between air-out pipe and air-supply line, and is two sets of the counter weight closing plate all is provided with the connection rope, it still includes two sets of dead levers of level setting in the gas chromatograph body outside to lead to the subassembly of closing, and is two sets of connect the rope and all walk around two sets of dead levers and be connected with the water tank, work as when the water tank is in full water state, the gravity of water tank is greater than the gravity of two sets of counter weight closing plates, and is two sets of the counter weight closing plate moves up and seals air-supply line and air-out pipe respectively under the effect of self gravity, works as when cooling water in the water tank is taken out by main water pump and circulates between inlet tube, cooling tube, outlet pipe and water tank, the gravity of water tank is less than the gravity of two sets of counter weight closing plate roll-off air-supply line and air-out pipe bottom respectively under the effect of self gravity.

By adopting the technical scheme, when the column incubator is heated, the gravity of the water tank in a full water state is larger than the gravity of the two groups of counterweight sealing plates, so that the two groups of counterweight sealing plates can move upwards under the action of the gravity of the water tank and respectively seal the air inlet pipe and the air outlet pipe, and the heat is not easy to lose from the air outlet pipe and the air inlet pipe when the temperature in the column incubator is raised; when the column incubator is cooled, the main water pump pumps out cooling water in the water tank and enables the cooling water to circulate between the water inlet pipe, the cooling pipe, the water outlet pipe and the water tank, so that the whole gravity of the water tank is smaller than the gravity of the two groups of counterweight sealing plates, the two groups of counterweight sealing plates can respectively slide out of the air inlet pipe and the air outlet pipe under the action of the gravity of the counterweight sealing plates, the openings of the air inlet pipe and the air outlet pipe are opened, the circulation of air in the column incubator is accelerated, a fan can discharge heat out of the ventilation pipe better, and the column incubator is favorable for improving the cooling effect.

Preferably, the outlet pipe still has the accessory pipe in parallel, the accessory pipe is established ties there is vice water pump, the solenoid valve is still installed to the inlet tube, main water pump and vice water pump both all with solenoid valve electric connection, work as when the solenoid valve circular telegram, main water pump opens, vice water pump closes, works as when the solenoid valve outage, main water pump closes, vice water pump opens.

By adopting the technical scheme, through the arrangement of the electromagnetic valve, when the column incubator needs to be heated, the electromagnetic valve is powered off, the main water pump is closed, the auxiliary water pump is opened, part of cooling water which is detained in the cooling pipe, the water inlet pipe and the water outlet pipe is pumped to the auxiliary pipe through the auxiliary water pump and then flows back to the water tank through the water outlet pipe, and therefore the water tank can better utilize the gravity in the full water state to drive the two groups of counterweight sealing plates to move upwards and respectively seal the pipe orifices of the air inlet pipe and the air outlet pipe; when the column oven needs to be cooled, the electromagnetic valve is powered on, so that the main water pump is started and the cooling water in the water tank is pumped out, the cooling water in the water tank is reduced, the gravity of the water tank is smaller than the gravity of the two groups of counterweight sealing plates, the two groups of counterweight sealing plates can respectively slide out of the air inlet pipe and the air outlet pipe bottom under the action of the gravity of the counterweight sealing plates, and the fan can better discharge heat out of the ventilation pipe.

Preferably, a limiting rod is erected on the side wall of the gas chromatograph body, the limiting rod is vertically arranged, the water tank is provided with a limiting ring, and the limiting rod is in sliding splicing fit with the limiting ring.

Through adopting above-mentioned technical scheme, through gag lever post and spacing ring slip grafting cooperation for the water tank can slide along the extending direction of gag lever post all the time, makes the water tank reciprocate the displacement that the in-process is difficult for producing other directions because gravity changes, makes the water tank be difficult for taking place to collide with the gas chromatograph body.

Preferably, the dead lever is all coaxial to rotate and is connected with spacing round, connect the rope butt at spacing round top periphery wall.

Through adopting above-mentioned technical scheme, through connecting the setting of rope butt at spacing round top periphery wall, be favorable to reducing the frictional force of connecting rope and dead lever for it is not fragile to connect the rope, is favorable to the life of extension connection rope.

Preferably, the cooling tube has a serpentine structure in a serpentine arrangement.

Through adopting above-mentioned technical scheme, be snakelike structure through the cooling tube, be favorable to prolonging the route that the cooling water removed in the cooling tube, and then make the water through in the cooling tube can be better with the heat absorption in the column incubator and take out the column incubator outside, be favorable to improving the cooling speed of column incubator better.

Preferably, eyebolt is bound at both ends of the connecting rope, an ear plate is arranged at the bottom of the counterweight sealing plate, and the eyebolt at both ends of the connecting rope is respectively in threaded connection with the ear plate and the outer wall of the top of the water tank.

Through adopting above-mentioned technical scheme, to connect the eyebolt at rope both ends and twist otic placode and water tank top outer wall respectively, alright realize will connect on rope both ends are connected to counter weight closing plate and water tank, when needs are changed and connect the rope, only need to connect the eyebolt at rope both ends and twist out from otic placode and water tank respectively, alright completion connect the change of rope, be favorable to reducing the dismouting degree of difficulty of connecting the rope.

Preferably, the outlet pipe is wound on the outer wall of the air outlet pipe.

Through adopting above-mentioned technical scheme, absorb out tuber pipe exhaust heat when flowing through the outlet pipe through the cooling water for the temperature near tuber pipe and the tuber pipe is difficult too high, is favorable to reducing the condition that operating personnel was scalded by the tuber pipe.

In summary, the present application includes at least one of the following beneficial technical effects:

1. a water tank is arranged on the outer wall of the gas chromatograph body, a water inlet pipe and a water outlet pipe are respectively communicated with two ends of the cooling pipe, the water inlet pipe and the water outlet pipe are both communicated with the water tank, and the water inlet pipe is also provided with a main water pump; the cooling water in the water tank is pumped out by the main water pump and flows back to the water tank after passing through the cooling pipe of the water inlet pipe and the water outlet pipe, so that the cooling water can circularly flow among the water inlet pipe, the cooling pipe, the water outlet pipe and the water tank, the cooling time of the column incubator is shortened by absorbing heat when the cooling water passes through the cooling pipe, the column incubator can dissipate heat by a fan, and meanwhile, partial heat can be taken away by the cooling water flowing through the cooling pipe, and the rapid cooling of the column incubator is realized;

2. the connecting rope is connected with the limiting ring in a coaxial rotating mode through the fixing rod, and the connecting rope abuts against the periphery of the limiting wheel, so that the friction force between the connecting rope and the fixing rod is reduced, the connecting rope is not easy to wear, and the connecting rope is more durable;

3. the water outlet pipe is wound on the air outlet pipe, so that heat flowing through the air outlet pipe can be absorbed by cooling water flowing through the water outlet pipe, and the air outlet pipe is not easy to overheat.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is an enlarged schematic view of section A of FIG. 2;

FIG. 3 is a schematic diagram illustrating the structure inside the column oven according to the embodiment of the present application;

fig. 4 is a schematic structural diagram for illustrating that the water tank is in a full water state according to the embodiment of the application.

Description of the reference numerals:

1. a gas chromatograph body; 11. an air inlet pipe; 12. an air outlet pipe; 13. a column oven; 14. a fan; 2. a cooling tube; 21. a water inlet pipe; 22. a water outlet pipe; 211. a main water pump; 212. an electromagnetic valve; 221. a secondary pipe; 222. an auxiliary water pump; 3. a water tank; 30. pipe passing; 301. a sealing cover; 31. a limiting ring; 32. a limiting rod; 321. a bump; 4. a counterweight sealing plate; 40. an ear plate; 41. fixing the rod; 42. a limiting wheel; 43. connecting ropes; 431. an eye bolt.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a gas chromatograph, which refers to fig. 1 and 2 and comprises a gas chromatograph body 1; referring to fig. 2 and 3, an air inlet pipe 11 and an air outlet pipe 12 are communicated with a column oven 13 of the gas chromatograph body 1, the air inlet pipe 11 and the air outlet pipe 12 both extend out of the gas chromatograph body 1 and are communicated with the outside, a fan 14 is further mounted in the column oven 13, the fan 14 is arranged opposite to the air outlet pipe 12, and the gas chromatograph body 1 is further provided with a closing and opening component for closing and opening the air outlet pipe 12 and the air inlet pipe 11; the gas chromatograph body 1 is further provided with a water tank 3 for storing cooling water. Still be provided with cooling tube 2 in the column incubator 13, the both ends of cooling tube 2 communicate respectively has inlet tube 21 and outlet pipe 22, and inlet tube 21 and outlet pipe 22 both keep away from the one end of cooling tube 2 and all communicate with water tank 3. When the temperature is reduced, the opening and closing assembly is opened to enable the air inlet pipe 11 and the air outlet pipe 12 to be communicated with the outside, and the fan 14 is used for discharging heat out of the air outlet pipe 12; meanwhile, the main water pump 211 is turned on to pump out the cooling water in the water tank 3 and flow back to the water tank 3 through the water inlet pipe 21, the cooling pipe 2 and the water outlet pipe 22, and the cooling water absorbs the heat in the column oven 13 when circulating in the cooling pipe 2, thereby improving the cooling efficiency of the column oven 13.

Referring to fig. 2 and 3, the water tank 3 is a hollow rectangular tank, the top of the water tank 3 is communicated with a through pipe 30, and the through pipe 30 is sleeved with a sealing cover 301 for sealing the water inlet pipe 21, so as to facilitate the replacement of the cooling liquid.

Referring to fig. 2 and 4, the air inlet pipe 11 and the air outlet pipe 12 are both horizontally disposed and the air inlet pipe 11 and the air outlet pipe 12 are both located on the same horizontal plane. The closing component comprises two groups of counterweight sealing plates 4, the two groups of counterweight sealing plates 4 respectively correspond to the air inlet pipe 11 and the air outlet pipe 12 one by one, and the two groups of counterweight sealing plates 4 are respectively vertically inserted into the bottom pipe walls of the air inlet pipe 11 and the air outlet pipe 12 in a sliding manner; the bottoms of the air inlet pipe 11 and the air outlet pipe 12 are provided with sockets for inserting the corresponding counterweight sealing plates 4. The inner walls of the air inlet pipe 11 and the air outlet pipe 12 are provided with grooves for embedding the corresponding counterweight sealing plates 4, and the grooves are communicated with the jacks.

Referring to fig. 2 and 4, the ventilation and closure assembly further includes two sets of fixing rods 41 horizontally and fixedly connected to the outer side of the gas chromatograph body 1, the two sets of fixing rods 41 are located between the air inlet pipe 11 and the air outlet pipe 12, and the axes of the two sets of fixing rods 41 are higher than the sockets at the bottoms of the air inlet pipe 11 and the air outlet pipe 12.

Referring to fig. 2 and 4, the fixing rods 41 are coaxially and rotatably connected with a limiting wheel 42. The bottom outer wall of the counterweight sealing plate 4 is fixed with the lug plate 40 in a protruding mode, the lug plate 40 is provided with the connecting rope 43, the connecting rope 43 on the two sets of lug plates 40 bypasses the two sets of fixing rods 41 and abuts against the outer peripheral wall of the top of the limiting wheel 42 respectively, and the limiting wheel 42 is arranged, so that when the connecting rope 43 is pulled in a pulling mode, friction between the connecting rope 43 and the fixing rods 41 is reduced, and the connecting rope 43 is more durable. Lifting bolts 431 are bound at two ends of the connecting rope 43, and the lifting bolts 431 at the two ends of the connecting rope 43 are respectively in threaded connection with the lug plate 40 and the outer wall of the top of the water tank 3. When the damaged connecting rope 43 needs to be replaced, the connecting rope 43 can be replaced only by screwing the lifting bolts 431 at the two ends of the connecting rope 43 out of the lug plate 40 and the outer wall of the top of the water tank 3 respectively.

Referring to fig. 2 and 4, when the water tank 3 is in a full water state, the gravity of the water tank 3 is greater than the gravity of the two sets of counterweight sealing plates 4, the two sets of counterweight sealing plates 4 move upward under the gravity of the water tank 3 and respectively seal the air inlet pipe 11 and the air outlet pipe 12, and through the above arrangement, when the column incubator 13 is heated up, the gravity of the water tank 3 drives the two sets of counterweight sealing plates 4 to respectively move upward and seal the air inlet pipe 11 and the air outlet pipe 12, so that the heat in the column incubator 13 is not easily lost from the air inlet pipe 11 and the air outlet pipe 12. When the main water pump 211 pumps out the cooling water in the water tank 3 and the cooling water enters the water inlet pipe 21, the cooling pipe 2, the water outlet pipe 22 and the water tank 3 for circulation, the gravity of the two groups of counterweight sealing plates 4 is greater than that of the water tank 3 at the moment, and the two groups of counterweight sealing plates 4 respectively extend out of the sockets at the bottom sides of the air inlet pipe 11 and the air outlet pipe 12 under the driving of the gravity of the two groups of counterweight sealing plates 4; therefore, the air inlet pipe 11 and the air outlet pipe 12 can be communicated with the outside, the cooling water circularly flows in the cooling pipe 2 to absorb heat, and meanwhile, the fan 14 in the column incubator 13 can timely discharge the heat to the outside of the air outlet pipe 12, so that the cooling efficiency of the column incubator 13 is better improved.

Refer to fig. 2 and fig. 4, two sets of lugs 321 of fixedly connected with are still gone back in the gas chromatograph body 1 outside, two sets of lugs 321 deviate from the equal vertical downwardly fixedly connected with gag lever post 32 in one side of gas chromatograph body 1, two sets of outer walls that water tank 3 is relative correspond two sets of gag lever posts 32 and are fixed with two sets of spacing rings 31, two sets of gag lever posts 32 respectively with two sets of gag lever posts 31 slip grafting cooperation, through above setting, make water tank 3 reciprocate along vertical direction all the time, be favorable to reducing water tank 3 and reciprocate the in-process and take place to rock and lead to water tank 3 and the condition that gas chromatograph body 1 takes place to collide with.

Referring to fig. 2 and 3, the cooling tube 2 level is fixed at the diapire in the column incubator 13, and the cooling tube 2 is the snakelike structure of sinuous setting, utilizes the cooling tube 2 to be snakelike knot ditch, is favorable to prolonging the route of flowing through of coolant liquid in the cooling tube 2 to make the cooling water of flowing through the cooling tube 2 can absorb the heat in the column incubator 13 better, be favorable to improving the efficiency of column incubator 13 cooling.

Referring to fig. 2 and 4, the water outlet pipe 22 is further connected in parallel with an auxiliary pipe 221, the auxiliary pipe 221 is located at one end of the water outlet pipe 22 close to the water tank 3, and an auxiliary water pump 222 is installed on the auxiliary pipe 221; the main water pipe is also provided with an electromagnetic valve 212, and the main water pipe and the auxiliary water pipe are both electrically connected with the electromagnetic valve 212. When the solenoid valve 212 was switched on, main water pump 211 started and vice water pump 222 closed, when the solenoid valve 212 outage, main water pump 211 closed and vice water pump 222 opened, through above setting, when needs cooling, the accessible opened solenoid valve 212 for main water pump 211 is opened, makes main water pump 211 can take out the cooling water in the water tank 3 and makes the cooling water circulate between inlet tube 21, cooling tube 2, outlet pipe 22 and water tank 3. When the column incubator 13 needs to be heated up, the electromagnetic valve 212 is powered off, the main water pump 211 is turned off, the auxiliary water pump 222 is turned on, cooling water staying in the water inlet pipe 21 and the cooling pipe 2 can be pumped into the auxiliary pipe 221, and then flows into the water tank 3 through the water outlet pipe 22, so that the water tank 3 can enter a full water state faster, two groups of counterweight sealing plates 4 can move upwards respectively under the action of gravity of the water tank 3 in the full water state and seal the air inlet pipe 11 and the air outlet pipe 12, and heat in the column incubator 13 is not easy to run off from the air outlet pipe 12 and the air inlet pipe 11.

Referring to fig. 2 and 4, a part of the pipe body of the water outlet pipe 22 located outside the gas chromatograph body 1 is wound and fixed on the periphery of the air outlet pipe 12, and the cooling water flowing through the water outlet pipe 22 absorbs the heat of the air outlet pipe 12 exhausted by the fan 14, so that the temperature of the air outlet pipe 12 and the temperature near the air outlet pipe 12 are not too high easily, and the situation that an operator is scalded is reduced.

The implementation principle of the embodiment of the application is as follows: when the column incubator 13 needs to be cooled, the fan 14 is started and the electromagnetic valve 212 is powered on, so that the main water pump 211 is started, the main water pump 211 pumps out cooling water in the water tank 3 and returns to the water tank 3 through the water inlet pipe 21, the cooling pipe 2 and the water outlet pipe 22, the cooling water continuously and circularly flows in the water inlet pipe 21, the cooling pipe 2, the water outlet pipe 22 and the water tank 3, and heat in the column incubator 13 is absorbed when the cooling water flows in the cooling pipe 2, so that the column incubator 13 is cooled; meanwhile, because the partial cooling water in the water tank 3 flows when circulating among the water inlet pipe 21, the cooling pipe 2, the water outlet pipe 22 and the water tank 3, the gravity of the water tank 3 at the moment is smaller than the gravity of the two groups of counterweight sealing plates 4, so that the two groups of counterweight sealing plates 4 move downwards under the action of the gravity of the water tank, the water inlet pipe 21 is communicated with the water outlet pipe 22 and the outside, and the fan 14 can better discharge the heat in the column incubator 13 to the outside of the air outlet pipe 12. When the column oven 13 needs to be heated up, the electromagnetic valve 212 is powered off to control the main water pump 211 to be closed and the auxiliary water pump 222 to be opened, so that the cooling water retained in the water inlet pipe 21 and the cooling pipe 2 can flow back to the water tank 3 more quickly, the water tank 3 can enter a full water state, the gravity of the water tank 3 is larger than the gravity of the two sets of counterweight sealing plates 4, the two sets of counterweight sealing plates 4 can move upwards under the action of the gravity of the water tank 3 and respectively seal the air inlet pipe 11 and the air outlet pipe, and heat is not easy to lose through the air inlet pipe 11 and the air outlet pipe 12 when the column oven 13 is heated.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A gas chromatograph, characterized by: the device comprises a gas chromatograph body (1), wherein a fan (14) is installed in a column oven (13) of the gas chromatograph body (1), the column oven (13) of the gas chromatograph body (1) is communicated with an air inlet pipe (11) and an air outlet pipe (12), the air inlet pipe (11) and the air outlet pipe (12) are communicated with the outside, the air outlet pipe (12) is opposite to the fan (14), and the gas chromatograph body (1) is further provided with a closing component for closing the air outlet pipe (12) and the air inlet pipe (11); the gas chromatograph comprises a gas chromatograph body (1), and is characterized in that a water tank (3) for storing cooling water is arranged outside the gas chromatograph body (1), a cooling pipe (2) is arranged in a column incubator (13), two ends of the cooling pipe (2) are respectively communicated with a water inlet pipe (21) and a water outlet pipe (22), the water inlet pipe (21) and the water outlet pipe (22) are both communicated with the water tank (3), and the water inlet pipe (21) is also connected with a main water pump (211) in series;

lead to and close the subassembly and include two sets of counter weight closing plate (4), two sets of counter weight closing plate (4) slide respectively and peg graft in air-out pipe (12) and bottom pipe wall between air-supply line (11) both, and are two sets of counter weight closing plate (4) all are provided with and connect rope (43), lead to and close the subassembly still including level setting in two sets of dead lever (41) in the gas chromatograph body (1) outside, two sets of connect rope (43) all walk around two sets of dead lever (41) and be connected with water tank (3), work as when water tank (3) are in the full water state, the gravity of water tank (3) is greater than the gravity of two sets of counter weight closing plate (4), and is two sets of counter weight closing plate (4) move up and seal air-supply line (11) and air-out pipe (12) respectively under the effect of gravity of water tank (3), work as cooling water in water tank (3) is taken out by main water pump (211) and when circulating between inlet tube (21), cooling tube (2), outlet pipe (22) and water tank (3), the gravity of water tank (3) is less than the gravity of two sets of counter weight closing plate (4) and the effect of roll-off both under the effect of gravity of counter weight pipe (11) and air-out pipe (12).

2. Gas chromatograph according to claim 1, characterized in that: the water outlet pipe (22) is also connected with an auxiliary pipe (221) in parallel, the auxiliary pipe (221) is connected with an auxiliary water pump (222) in series, the water inlet pipe (21) is also provided with an electromagnetic valve (212), the main water pump (211) and the auxiliary water pump (222) are both electrically connected with the electromagnetic valve (212), when the electromagnetic valve (212) is electrified, the main water pump (211) is opened, and the auxiliary water pump (222) is closed; when the electromagnetic valve (212) is powered off, the main water pump (211) is closed, and the auxiliary water pump (222) is opened.

3. Gas chromatograph according to claim 1, characterized in that: gas chromatograph body (1) lateral wall erects gag lever post (32), gag lever post (32) vertical setting, water tank (3) are provided with spacing ring (31), gag lever post (32) and spacing ring (31) slip grafting cooperation.

4. The gas chromatograph of claim 3, wherein: the fixing rods (41) are coaxially and rotatably connected with limit wheels (42), and the connecting ropes (43) are abutted to the peripheral wall of the tops of the limit wheels (42).

5. The gas chromatograph of claim 1, wherein: the cooling pipe (2) is of a serpentine structure in a serpentine arrangement.

6. Gas chromatograph according to claim 2, characterized in that: and the two ends of the connecting rope (43) are all bound with lifting bolts (431), the bottom of the counterweight sealing plate (4) is provided with an ear plate (40), and the lifting bolts (431) at the two ends of the connecting rope (43) are respectively in threaded connection with the ear plate (40) and the outer wall of the top of the water tank (3).

7. The gas chromatograph of claim 6, wherein: the water outlet pipe (22) is wound on the outer wall of the air outlet pipe (12).