Gas resistance adjusting device for gas chromatographic analyzer

Abstract

The utility model provides a gas resistance adjusting device for a gas chromatographic analyzer, which comprises a gas flow pipeline for communicating a gas inlet end with a detector, and a filter and a micro needle valve which are sequentially arranged on the gas flow pipeline from the gas inlet end to the detector, the miniature needle valve comprises a valve shell, a valve cover, a valve rod, an operating handle, a plunger, a conical valve head, a stuffing box, a plugging threaded sleeve, a first sealing ring and a second sealing ring, the valve cover is fixedly connected with the top of the valve shell and is of a sleeve structure, the bottom of the valve rod is fixedly connected with the plunger, the bottom of the plunger is fixedly connected with the conical valve head, and the outer wall of the bottom of the valve rod is connected with the inner wall of the valve cover through threads. The stuffing box is arranged between the outer wall of the middle of the valve rod and the inner wall of the valve deck, the plugging threaded sleeve is arranged at the top of the valve deck, the bottom of the plugging threaded sleeve abuts against the top of the stuffing box, and the first sealing ring and the second sealing ring are arranged on the outer wall of the plunger and abut against the inner wall of the valve deck. The air resistance pressure and the air flow of the system can be flexibly adjusted, and the maintenance is more convenient.

Description

Technical Field

[0001] The utility model relates to a gas resistance regulating device, in particular to a gas resistance regulating device used for a gas chromatograph analyzer, and belongs to the technical field of chemical detection equipment. Background Art

[0002] Capillary air blocker is an important component of online gas chromatograph, but the capillary air blocker in the prior art is usually a 1 / 16-inch ferrule, and the head of the air blocker interface of the tube is flat, so that the system air blocker pressure is steadily reduced, but the system air blocker pressure and the carrier gas flow rate cannot be adjusted, and the pipeline is easily blocked when encountering gas containing heavy components. Utility Model Content

[0003] Based on the above background, the purpose of the utility model is to provide a gas resistance regulating device for a gas chromatograph to achieve flexible adjustment of the system gas resistance pressure and gas flow.

[0004] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0005] A gas resistance regulating device for a gas chromatograph, comprising an air flow pipeline for connecting an air inlet end and a detector, and a filter and a micro needle valve arranged in sequence on the air flow pipeline from the air inlet end to the detector, wherein the filter is used to remove impurities in the air flowing through the air flow pipeline, and the micro needle valve is used to control the air flow rate of the air flowing through the air flow pipeline, and the micro needle valve comprises a valve housing, a valve cover, a valve stem, an operating handle, a plunger, a conical valve head, a stuffing box, a plugging screw sleeve, a first sealing ring and a second sealing ring, wherein the valve housing is provided with an air inlet end and a detector connected in sequence The valve cover is fixedly connected to the top of the valve housing, the valve cover is a sleeve structure, the valve stem, the plunger and the conical valve head are arranged in the valve cover in sequence, the top of the valve stem is fixedly connected to the operating handle, the bottom of the valve stem is fixedly connected to the plunger, the bottom of the plunger is fixedly connected to the conical valve head, the outer wall of the bottom of the valve stem is connected to the inner wall of the valve cover through a thread, the stuffing box is arranged between the outer wall of the middle part of the valve stem and the inner wall of the valve cover, the sealing screw sleeve is arranged at the top of the valve cover, and the bottom of the sealing screw sleeve abuts against the top of the stuffing box, and the first sealing ring and the second sealing ring are arranged on the outer wall of the plunger and abut against the inner wall of the valve cover.

[0006] Preferably, the cross-section of the regulating flow channel is T-shaped, the inlet flow channel is connected to the top side of the regulating flow channel, the outlet flow channel is connected to the lower side of the regulating flow channel, and the conical valve head can block the junction of the horizontal part and the vertical part of the regulating flow channel.

[0007] Preferably, the first sealing ring and the second sealing ring are made of fluororubber, perfluororubber or high temperature resistant silicone rubber.

[0008] Preferably, the filter is a T-type filter.

[0009] Preferably, the detector is a hydrogen flame ionization detector.

[0010] Preferably, the air flow pipeline is a stainless steel metal hose.

[0011] Preferably, the stainless steel metal hose has a specification of 1 / 8 inch.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The utility model discloses a gas resistance regulating device for a gas chromatograph, which can flexibly adjust the gas resistance pressure and gas flow of the system and is convenient to maintain.

[0014] For working scenarios with high gas temperatures, the micro needle valve adopted in the utility model has double sealing insurance. The first insurance is the sealing screw sleeve and the stuffing box, and the second insurance is two sealing rings made of high-temperature resistant materials, thereby ensuring the safe monitoring of high-temperature gas by the gas chromatograph. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a gas resistance regulating device for a gas chromatograph analyzer of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the micro needle valve in the utility model.

[0018] In the figure: 1. air inlet end; 2. detector; 3. air flow pipeline; 4. filter; 5. micro needle valve; 501. valve housing; 502. valve cover; 503. valve stem; 504. operating handle; 505. plunger; 506. conical valve head; 507. stuffing box; 508. sealing screw sleeve; 509. first sealing ring; 510. second sealing ring; 511. air inlet channel; 512. regulating channel; 513. air outlet channel. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described in detail below through specific embodiments and in combination with the accompanying drawings. It should be understood that the implementation of the utility model is not limited to the following embodiments, and any form of modification and / or change made to the utility model will fall within the protection scope of the utility model.

[0020] In the present invention, unless otherwise specified, all parts and percentages are weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the field. The methods in the following embodiments, unless otherwise specified, are conventional methods in the field. The components or equipment in the following embodiments, unless otherwise specified, are universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods.

[0021] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. In the following detailed description, for ease of explanation, many specific details are described to provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may also be implemented by those skilled in the art without these specific details.

[0022] like Figure 1 As shown, the embodiment of the utility model discloses a gas resistance regulating device for a gas chromatograph, comprising a gas flow pipeline 3 for connecting an inlet end 1 and a detector 2, and a filter 4 and a micro needle valve 5 sequentially arranged on the gas flow pipeline 3 from the inlet end 1 to the detector 2. The inlet end 1 refers to the inlet end 1 of the gas chromatograph, which is used to introduce a carrier gas. The detector 2 is a hydrogen flame ionization detector 2.

[0023] In order to prevent the gas containing heavy components from clogging the gas flow pipeline 3, in this embodiment, the gas flow pipeline 3 is a stainless steel metal hose, and the specification of the stainless steel metal hose is 1 / 8 inch.

[0024] The filter 4 is used to remove impurities from the gas flowing through the gas flow pipeline 3 . In this embodiment, the filter 4 is a T-type filter 4 .

[0025] The micro needle valve 5 is used to control the gas flow rate of the gas flowing through the gas flow pipeline 3. The micro needle valve 5 includes a valve housing 501, a valve cover 502, a valve stem 503, an operating handle 504, a plunger 505, a conical valve head 506, a stuffing box 507, a plugging screw 508, a first sealing ring 509 and a second sealing ring 510.

[0026] The valve housing 501 is provided with an inlet flow channel 511, a regulating flow channel 512 and an outlet flow channel 513 which are connected in sequence, wherein the cross section of the regulating flow channel 512 is T-shaped, the inlet flow channel 511 is connected to the top side of the regulating flow channel 512, the rear end of the inlet flow channel 511 is inclined upward, the outlet flow channel 513 is connected to the lower side of the regulating flow channel 512, and the front end of the outlet flow channel 513 is also inclined upward, which is roughly the same as the inclination direction of the rear end of the inlet flow channel 511. The conical valve head 506 can block the junction of the horizontal part and the vertical part of the regulating flow channel 512. By changing the position of the conical valve head 506 relative to the junction, the connection area between the regulating flow channel 512 and the outlet flow channel 513 is changed, thereby realizing gas volume regulation.

[0027] The valve cover 502 is fixedly connected to the top of the valve housing 501. The valve cover 502 is a sleeve structure. The valve stem 503, the plunger 505 and the conical valve head 506 are sequentially arranged in the valve cover 502. The top of the valve stem 503 is fixedly connected to the operating handle 504. There is a certain distance between the operating handle 504 and the top of the plugging screw sleeve 508 to ensure the operating space. The bottom of the valve stem 503 is fixedly connected to the plunger 505, and the bottom of the plunger 505 is fixedly connected to the conical valve head 506. The outer wall of the bottom of the valve stem 503 is connected to the inner wall of the valve cover 502 through a thread. The stuffing box 507 is arranged between the outer wall of the middle part of the valve stem 503 and the inner wall of the valve cover 502. Rotate the operating handle 504 to rotate the valve stem 503 relative to the valve cover 502. Under the action of the threaded connection between the two, the valve stem 503 moves up or down relative to the valve cover 502, driving the conical valve head 506 at the bottom end of the plunger 505 to change the position of the junction of the horizontal part and the vertical part relative to the regulating channel 512, thereby adjusting the gas volume.

[0028] The plugging screw 508 is arranged on the top of the valve cover 502, and the two are connected by threads. The valve stem 503 passes through the plugging screw 508. The bottom of the plugging screw 508 abuts against the top of the stuffing box 507. The stuffing box 507 is squeezed between the bottom of the plugging screw 508 and the step portion in the middle of the inner wall of the valve cover 502, forming the first sealing protection for the regulating flow channel 512.

[0029] The first sealing ring 509 and the second sealing ring 510 are arranged on the outer wall of the plunger 505 and abut against the inner wall of the valve cover 502, forming a second sealing protection for the regulating flow channel 512. Considering the high temperature of the online monitoring gas, the first sealing ring 509 and the second sealing ring 510 are made of fluororubber, perfluororubber or high temperature resistant silicone rubber.

[0030] The gas resistance regulating device for a gas chromatograph can realize flexible adjustment of the gas resistance pressure and gas flow of the system and is relatively convenient to maintain.

[0031] In addition, for working scenarios with high gas temperatures, the micro needle valve 5 has double sealing insurance. The first insurance is the sealing screw sleeve 508 and the stuffing box 507, and the second insurance is two sealing rings made of high-temperature resistant materials, thereby ensuring the safe monitoring of high-temperature gas by the gas chromatograph.

[0032] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A gas resistance regulating device for a gas chromatograph, Features: The gas resistance regulating device for a gas chromatograph comprises an air flow pipeline (3) for connecting an air inlet end (1) and a detector (2), and a filter (4) and a micro needle valve (5) arranged on the air flow pipeline (3) in sequence from the air inlet end (1) to the detector (2), wherein the filter (4) is used to remove impurities in the air flowing through the air flow pipeline (3), and the micro needle valve (5) is used to control the air flow rate of the air flowing through the air flow pipeline (3). The micro needle valve (5) comprises a valve housing (501), a valve cover (502), a valve stem (503), an operating handle (504), a plunger (505), a conical valve head (506), a stuffing box (507), a plugging screw sleeve (508), a first sealing ring (509) and a second sealing ring (510), and the valve housing (501) is provided with an inlet flow channel (511), a regulating flow channel (512) and an outlet flow channel (513) which are connected in sequence. ), the valve cover (502) is fixedly connected to the top of the valve housing (501), the valve cover (502) is a sleeve structure, the valve stem (503), the plunger (505) and the conical valve head (506) are arranged in the valve cover (502) in sequence, the top of the valve stem (503) is fixedly connected to the operating handle (504), the bottom of the valve stem (503) is fixedly connected to the plunger (505), the bottom of the plunger (505) is fixedly connected to the conical valve head (506), the valve stem (5 03) The bottom outer wall is connected to the inner wall of the valve cover (502) by a thread, the stuffing box (507) is arranged between the middle outer wall of the valve stem (503) and the inner wall of the valve cover (502), the plugging screw sleeve (508) is arranged on the top of the valve cover (502), and the bottom of the plugging screw sleeve (508) is against the top of the stuffing box (507), and the first sealing ring (509) and the second sealing ring (510) are arranged on the outer wall of the plunger (505) and against the inner wall of the valve cover (502).

2. A gas resistance regulating device for a gas chromatograph according to claim 1, Features: The cross section of the regulating flow channel (512) is T-shaped, the inlet flow channel (511) is connected to the top side of the regulating flow channel (512), the outlet flow channel (513) is connected to the lower side of the regulating flow channel (512), and the conical valve head (506) can block the junction of the horizontal part and the vertical part of the regulating flow channel (512).

3. The gas resistance regulating device for a gas chromatograph according to claim 1, Features: The first sealing ring (509) and the second sealing ring (510) are made of fluororubber, perfluororubber or high temperature resistant silicone rubber.

4. The gas resistance regulating device for a gas chromatograph according to claim 1, Features: The filter (4) is a T-type filter (4).

5. The gas resistance regulating device for a gas chromatograph according to claim 1, Features: The detector (2) is a hydrogen flame ionization detector (2).

6. The gas resistance regulating device for a gas chromatograph according to claim 1, Features: The air flow pipeline (3) is a stainless steel metal hose.

7. A gas resistance regulating device for a gas chromatograph according to claim 6, Features: The specification of the stainless steel metal hose is 1 / 8 inch.

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