Gas inlet structure of gas chromatograph

Abstract

The utility model provides a gas chromatograph gas inlet structure, which relates to the field of gas chromatograph, and comprises a containing cavity arranged between a gas tank and an inlet, the containing cavity is divided into a gas inlet end and a gas outlet end, the gas inlet end and the gas outlet end are respectively connected and communicated with a one-way valve, a piston plate is connected in the containing cavity in a sliding manner, and the piston plate is connected with a piston rod. And a power mechanism for driving the piston plate to linearly move is arranged in the accommodating cavity. According to the gas inlet structure of the gas chromatograph, gas in a gas cylinder is dried through a drying unit, filtered through a filtering unit and pumped into a containing cavity under the action of a gas pump, part of the gas is temporarily stored in the containing cavity, and when the gas needs to be introduced, a power mechanism can move so that a piston plate can keep linear motion; therefore, stability of airflow can be guaranteed, and the problem that airflow is unstable due to the fact that air is supplied directly through an air cylinder in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas chromatograph technical field, concretely is a kind of gas chromatograph air intake structure. BACKGROUND

[0002] Gas chromatograph refers to the vaporization of sample in sample inlet by carrier gas into chromatographic column, through the chromatographic column with different retention performance to the component of the mixture to be detected, the component is separated, sequentially introduced into detector, to obtain the detection signal of each component. It is used for quantitative and qualitative analysis, and can also measure the distribution coefficient, activity coefficient, molecular weight and specific surface area of sample in fixed phase and other physical and chemical constants.

[0003] In the working process of gas chromatograph, sample is input into gas chromatograph, and input sample is to add gas or liquid sample to the upper end of chromatographic column at a uniform speed and a constant amount. In the air intake system of ordinary gas chromatograph, the gas needs to pass through drying unit and filtering unit for filtering. In this process, impurities can affect flow rate, so that the air intake end of gas chromatograph is unstable. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a kind of gas chromatograph air intake structure, solve the problem raised in background art.

[0005] TECHNICAL SCHEME

[0006] To achieve the above object, the utility model is realized by the following technical scheme: a kind of gas chromatograph air intake structure, including the containing cavity being arranged between gas tank and import, the containing cavity is divided into air intake end and air outlet end, air intake end and air outlet end are connected and penetrated with one-way valve respectively, piston plate is slidably connected in the inside of containing cavity, and power mechanism for driving linear motion of piston plate is arranged in the inside of containing cavity.

[0007] Further, the containing cavity air intake end is connected and penetrated with drying unit and filtering unit, and gas pump is arranged between filtering unit and air intake end one-way valve.

[0008] Further, the outlet end of the containing cavity is connected and penetrated with three-way, the air inlet of three-way is connected and penetrated with the one-way valve located in the air outlet end, one air outlet of three-way is connected and penetrated with positive constant pressure valve, and the other air outlet end of three-way is connected and penetrated with control valve.

[0009] Further, the drying unit and filtering unit all include cavity that communicates with each other, the cavity is provided with opening and closing and sealing retaining gap at one end, and consumable is placed in the inside of cavity by gap.

[0010] Furthermore, the cross-section of the receiving cavity is rectangular, and the four corners of the rectangle are rounded. The cross-sectional shape of the piston plate is adapted to the cross-sectional shape of the receiving cavity.

[0011] Furthermore, the power mechanism includes a sliding sleeve, the free end and the fixed end of which are fixedly connected by a compression spring, and the free end of the sliding sleeve is fixedly connected to the piston plate.

[0012] Furthermore, the power mechanism includes a sliding sleeve, inside which a sliding rod is slidably connected. The bottom end of the sliding rod is fixedly connected to a piston plate, and a permanent magnet plate is fixedly installed at the top end of the sliding rod. An electromagnet is fixedly installed on the inner top wall of the sliding sleeve.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The gas inlet structure of this gas chromatograph dries the gas in the gas cylinder through a drying unit and filters it through a filtration unit. Under the action of a gas pump, the gas is drawn into the receiving chamber, where a portion of the gas is temporarily stored. When gas is needed, the power mechanism can move to keep the piston plate moving linearly, thereby ensuring the stability of the gas flow and solving the problem of unstable gas flow caused by direct gas supply from gas cylinders in the prior art.

[0015] 2. The gas chromatograph's air inlet structure is connected to and penetrates a tee through the outlet end of the set receiving cavity. The air inlet of the tee is connected to and penetrates a one-way valve located at the air outlet end. One air outlet of the tee is connected to and penetrates a positive constant pressure valve, and the other air outlet of the tee is connected to and penetrates a control valve. By setting a positive constant pressure valve, it is possible to exhaust gas in time to maintain a stable gas pressure when an unexpected increase in gas pressure occurs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the three-way connection of this utility model;

[0018] Figure 3 This is a schematic diagram of the air pump connection of this utility model;

[0019] Figure 4 This is a schematic diagram of the slide bar connection of this utility model;

[0020] Figure 5 This is a schematic diagram of the sliding sleeve connection of this utility model.

[0021] Wherein, 1, accommodating cavity; 2, check valve; 3, piston plate; 4, power mechanism; 5, drying unit; 6, filtering unit; 7, air pump; 8, three-way; 9, positive constant pressure valve; 10, control valve; 501, cavity; 502, notch; 503, consumables; 401, sliding sleeve; 402, compression spring; 403, sliding sleeve; 404, slide rod; 405, permanent magnet plate; 406, electromagnet. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0023] Referring to Figures 1-5 A gas chromatograph gas inlet structure, including the accommodating cavity 1 being arranged between the gas tank and the inlet, the accommodating cavity 1 is divided into the gas inlet end and the gas outlet end, the gas inlet end and the gas outlet end are connected and penetrated by the check valve 2 respectively, the piston plate 3 is slidably connected in the inside of the accommodating cavity 1, the power mechanism 4 that drives the linear motion of the piston plate 3 is arranged in the inside of the accommodating cavity 1, by temporarily storing the gas in the gas tank in the accommodating cavity 1, and by the piston plate 3, the gas is continuously and stably discharged.

[0024] The gas inlet end of the accommodating cavity 1 is connected and penetrated by the drying unit 5 and the filtering unit 6, the air pump 7 is arranged between the filtering unit 6 and the gas inlet end check valve 2, by setting the air pump 7, the gas in the gas tank can be extracted into the accommodating cavity 1, and the air pump 7 can play the role of cut-off when not working to avoid the gas flow instability caused by the gas inlet during the exhaust process in the accommodating cavity 1.

[0025] The outlet end of the accommodating cavity 1 is connected and penetrated by the three-way 8, the gas inlet of the three-way 8 is connected and penetrated by the check valve 2 located at the gas outlet end, one gas outlet of the three-way 8 is connected and penetrated by the positive constant pressure valve 9, the other gas outlet end of the three-way 8 is connected and penetrated by the control valve 10, by setting the positive constant pressure valve 9, the stable gas pressure can be maintained by timely exhaust when the unexpected gas pressure increases.

[0026] The drying unit 5 and the filtering unit 6 all include the cavity 501 that communicates with each other, the cavity 501 one end is provided with the notch 502 that can be opened and closed and keeps sealing, the consumables 503 that enter by the notch 502 are placed in the inside of the cavity 501, by such setting, the consumables 503 can be replaced conveniently.

[0027] The cross section of the accommodating cavity 1 is rectangular, the four corners of the rectangle are chamfered, the cross section shape of the piston plate 3 is matched with the cross section shape of the accommodating cavity 1, through the arrangement, the piston plate 3 can be conveniently installed and sealed.

[0028] The power mechanism 4 comprises a sliding sleeve 401, the free end and the fixed end of the sliding sleeve 401 are fixedly connected through a compression spring 402, the free end of the sliding sleeve 401 is fixedly connected with the piston plate 3, the gas is injected into the accommodating cavity 1 through the air pump 7 and the compression spring 402 is compressed, the stable outward exhaust can be realized when stopping gas supply and starting exhaust.

[0029] The power mechanism 4 comprises a sliding sleeve 403, the sliding sleeve 403 is slidably connected with a sliding rod 404, the bottom end of the sliding rod 404 is fixedly connected with the piston plate 3, the top end of the sliding rod 404 is fixedly installed with a permanent magnet plate 405, the inner top wall of the sliding sleeve 403 is fixedly installed with an electromagnet 406, the pressure of the electromagnet 406 on the permanent magnet plate 405 can be kept constant through controlling the power-on amount of the electromagnet 406, so that the constant exhaust amount can be actively kept.

[0030] In use, the gas in the gas cylinder is dried through the drying unit 5 and filtered through the filtering unit 6, and is drawn into the accommodating cavity 1 under the action of the air pump 7, part of the gas is temporarily stored in the accommodating cavity 1, when the gas needs to be introduced, the power mechanism 4 can move so that the piston plate 3 can keep linear motion, so that the stability of the gas flow can be ensured.

[0031] It should be noted that the relational terms herein such as first and second and the like are used only to differentiate one entity or operation from another, and do not necessarily require or imply that these entities or operations exist in any actual relationship or order.

[0032] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A gas chromatograph inlet structure comprising a housing cavity (1) disposed between a gas cylinder and an inlet, characterised in that: The accommodating cavity (1) is divided into an air inlet end and an air outlet end, the air inlet end and the air outlet end are connected and penetrated by one-way valves (2) respectively, the inside of the accommodating cavity (1) is slidably connected with a piston plate (3), and the inside of the accommodating cavity (1) is provided with a power mechanism (4) for driving the linear motion of the piston plate (3).

2. The gas chromatograph inlet structure of claim 1, wherein: The air inlet end of the accommodating cavity (1) is connected and penetrated by a drying unit (5) and a filtering unit (6), and an air pump (7) is arranged between the filtering unit (6) and the air inlet end one-way valve (2).

3. The gas chromatograph inlet structure of claim 1, wherein: The outlet end of the accommodating cavity (1) is connected and penetrated by a three-way joint (8), the air inlet of the three-way joint (8) is connected and penetrated by the one-way valve (2) at the air outlet end, one air outlet of the three-way joint (8) is connected and penetrated by a positive constant pressure valve (9), and the other air outlet of the three-way joint is connected and penetrated by a control valve (10).

4. The gas chromatograph inlet structure of claim 2, wherein: The drying unit (5) and the filtering unit (6) each comprise a cavity (501) in communication with each other, one end of the cavity (501) is provided with a gap (502) which can be opened and closed and kept sealed, and the inside of the cavity (501) is placed with a consumable (503) entering from the gap (502).

5. The gas chromatograph inlet structure of any one of claims 1-4, wherein: The cross section of the accommodating cavity (1) is rectangular, the four corners of the rectangle are rounded, and the cross section shape of the piston plate (3) is matched with the cross section shape of the accommodating cavity (1).

6. A gas chromatograph inlet structure as defined in claim 5, wherein: The power mechanism (4) comprises a sliding sleeve (401), the free end and the fixed end of the sliding sleeve (401) are fixedly connected through a compression spring (402), and the free end of the sliding sleeve (401) is fixedly connected with the piston plate (3).

7. A gas chromatograph inlet structure as defined in claim 5, wherein: The power mechanism (4) comprises a sliding sleeve (403), the inside of the sliding sleeve (403) is slidably connected with a sliding rod (404), the bottom end of the sliding rod (404) is fixedly connected with the piston plate (3), the top end of the sliding rod (404) is fixedly installed with a permanent magnet plate (405), and the inner top wall of the sliding sleeve (403) is fixedly installed with an electromagnet (406).

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