CN215807014U

CN215807014U - Cleaning joint for gas chromatography

Info

Publication number: CN215807014U
Application number: CN202122261404.4U
Authority: CN
Inventors: 沙薇; 朱盼盼; 马宗普; 宋佳; 佘弋; 张智佳
Original assignee: Shenzhen Yangli Pharmaceutical Technology Co ltd
Current assignee: Shenzhen Yangli Pharmaceutical Technology Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2022-02-11
Anticipated expiration: 2031-09-17

Abstract

The utility model discloses a cleaning joint for gas chromatography, which comprises a first joint and a second joint, wherein the first joint is fixedly connected with the second joint through a middle connecting cylinder, a rotating screw cap is sleeved on the outer wall of the first joint, a plurality of thread rings are arranged on the outer wall of the first joint, the top of the first joint is divided into four splicing blocks through quartering tangent lines, the outer walls of the splicing blocks are fixedly connected with limiting edges, a funnel-shaped inclined channel is arranged inside the second joint, a plug is arranged in the inclined channel, a supporting plate is fixedly connected between the inner walls of the connecting cylinders, the bottom of the supporting plate is connected with the plug through a spring, the connecting area of the first joint can be increased by equally dividing the four splicing blocks, the splicing blocks are extruded and fixed by rotating the screw cap to move up and down, meanwhile, the splicing block is enabled to be suitable for capillaries with different diameters by means of the gradually reduced diameter of the inner ring of the splicing block, an inclined channel is formed inside the bottom connector II, and a check valve is formed by matching the plug with the spring.

Description

Cleaning joint for gas chromatography

Technical Field

The utility model relates to the technical field of gas chromatography separation, in particular to a cleaning joint for gas chromatography.

Background

The gas chromatography is a major scientific and technological achievement appearing in the fifties of the twentieth century, is a new separation and analysis technology and is widely applied to industry, agriculture, national defense, construction and scientific research, the gas chromatography is used for separating substances by means of a capillary chromatographic column, the capillary chromatographic column has different adsorption and desorption capacities for the fixed phase according to a series of chemical properties such as polarity, boiling point and the like of a compound entering the chromatographic column, so that the compound is separated on the chromatographic column, after the capillary chromatographic column is used for a long time, sample impurities are adsorbed on the tube wall of the tube to influence detection, the chromatographic column needs to be cleaned, different cleaning joints are required to be adopted for connection due to different diameters of capillary tubes when the capillary chromatographic column is cleaned, and the firm and tight connection of the joints is more important, meanwhile, during cleaning, it is preferable that the cleaning solution flows from one end of the capillary chromatographic column to the other end in a single direction, so as to prevent the cleaning solution from flowing back to cause unclean cleaning.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a cleaning joint for gas chromatography, which solves the above problems of the related art.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a gas chromatography is with wasing joint, includes joint one and joint two, joint one passes middle part connecting cylinder fixed connection with joint two, a joint outer wall cover is equipped with one and rotates the nut, a joint outer wall is equipped with a plurality of rings of screw, just rotate nut and ring of screw phase-match, a joint top is cut apart into four splice pieces through quartering tangent line, splice piece outer wall fixedly connected with is spacing limit, splice piece inner wall fixedly connected with silica gel piece, connect two inside infundibulate slope passageways that are equipped with, just be equipped with the stopper in the slope passageway, fixedly connected with backup pad between the connecting cylinder inner wall, be connected through the spring between backup pad bottom and the stopper.

Preferably, the cross section of the connecting cylinder is designed into an oval structure, and the diameters of the inner walls of the connecting cylinder are larger than the diameters of the inner walls of the first connector and the second connector.

Preferably, the outer wall of the rotating nut is provided with a circle of anti-slip stripes.

Preferably, the four splicing blocks are all designed to be bent outwards, and the diameter of the inner wall of the circular channel surrounded by the four splicing blocks is designed to be gradually reduced from top to bottom.

Preferably, the surface of the supporting plate is provided with a plurality of ventilation holes.

Preferably, the inner wall of the joint two-way channel is provided with an internal thread interface.

Compared with the prior art, the utility model has the beneficial effects that: according to the cleaning joint for the gas chromatography, the top joint I is equally cut into four scattered splicing blocks, the joint connecting area can be increased, the splicing blocks are extruded and fixed by rotating the screw cap to rotate and move up and down, the diameters of inner rings of the splicing blocks are gradually reduced, so that the splicing joint can be suitable for capillaries with different diameters, the inclined channel is formed in the bottom joint II, the plug is matched with the spring to form the one-way valve, cleaning liquid is limited to flow in one direction, and the situation that the capillaries are not cleaned cleanly due to backflow of the cleaning liquid is avoided.

Drawings

FIG. 1 is a schematic perspective view of a cleaning joint for gas chromatography according to the present invention;

FIG. 2 is a schematic perspective view of a cleaning joint for gas chromatography according to the present invention;

FIG. 3 is an enlarged view of the structure A in FIG. 2 of a cleaning joint for gas chromatography according to the present invention;

FIG. 4 is a front cross-sectional view of a purge fitting for gas chromatography in accordance with the present invention.

In the figure: 1. a first connector; 2. a connecting cylinder; 3. a second joint; 4. rotating the nut; 41. anti-skid stripes; 5. a thread ring; 6. quartering tangent lines; 7. splicing blocks; 71. a limiting edge; 8. a silica gel block; 9. an inclined channel; 10. a plug; 11. a support plate; 12. a spring; 13. and (6) opening holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, in the embodiment of the utility model, a cleaning joint for gas chromatography comprises a first joint 1 and a second joint 3, the first joint 1 and the second joint 3 are fixedly connected through a middle connecting cylinder 2, a rotating nut 4 is sleeved on the outer wall of the first joint 1, a plurality of thread rings 5 are arranged on the outer wall of the first joint 1, the rotating nut 4 is matched with the thread rings 5, the rotating nut 4 rotates along the thread rings 5 to enable the rotating nut 4 to move upwards or downwards, the top of the first joint 1 is divided into four splicing blocks 7 through a quartering tangent line 6, the outer wall of each splicing block 7 is fixedly connected with a limiting edge 71, the limiting edge 71 can prevent the rotating nut 4 from being separated from the first joint 1 to cause the nut to be lost and unusable, a silica gel block 8 is fixedly connected to the inner wall of each splicing block 7, and the silica gel block 8 can seal a capillary connected with the first joint 1, avoid the circulation of air to lead to unable formation negative pressure, connect two 3 inside infundibulate inclined passage 9 that is equipped with, just be equipped with stopper 10 in the inclined passage 9, fixedly connected with backup pad 11 between 2 inner walls of connecting cylinder, be connected through spring 12 between 11 bottoms of backup pad and the stopper 10, through stopper 10 and inclined passage 9 mutual joint and separation, can restrict the washing liquid and can only one-wayly follow and connect two 3 flow direction connectors 1 uses.

Wherein, 2 cross-sections of connecting cylinder are oval structural design, just 2 inner wall diameters of connecting cylinder all are greater than joint one 1 and connect two 3 inner wall diameters, and the connecting cylinder 2 of oval structure can increase inside washing liquid flow cross section, slows down washing liquid flow rate to make washing liquid and the inside attached residue of capillary gas chromatography column fully react and dissolve.

Wherein, the outer wall of the rotating nut 4 is provided with a circle of anti-slip stripes 41, which is convenient for users to rotate the rotating nut 4.

The four splicing blocks 7 are designed to be bent outwards, the area of an inlet of the first connector 1 can be increased, and the diameter of the inner wall of the circular channel surrounded by the four splicing blocks 7 is designed to be gradually reduced from top to bottom, so that the capillary tube connector can adapt to capillary tubes with different diameters.

The surface of the supporting plate 11 is provided with a plurality of ventilation holes 13, so that the cleaning liquid can smoothly pass through the ventilation holes 13 without influencing the normal flow of the cleaning liquid.

And an internal thread interface is formed on the inner wall of the channel of the second connector 3, and the second connector 3 can be connected with a cleaning liquid pipeline through the internal thread interface or directly placed under the cleaning liquid.

The working principle of the utility model is as follows: the capillary tube of the gas chromatographic column is connected into the connector I1, the rotating screw cap 4 is rotated to enable the rotating screw cap 4 to move upwards along the threaded ring 5, the extrusion splicing block 7 is used for fixing the capillary tube, the silica gel block 8 can seal the joint, the limiting edge 71 on the outer wall of the splicing block 7 can prevent the rotating screw cap 4 from being separated from the connector I1 and being incapable of being used, the connector II 3 is connected with a cleaning liquid pipeline through an internal thread interface or is directly placed in the cleaning liquid, the cleaning liquid enters along the connector II 3 through external inert gas positive pressure cleaning liquid, the plug 10 is pushed to flow upwards in the inclined channel 9, the flow speed is slowed due to the increase of the flow area after passing through the connecting cylinder 2, the cleaning liquid and the attachments in the capillary tube are fully reacted and dissolved, when the external connection has no positive pressure, the spring 12 is reset to enable the plug 10 to plug the inclined channel 9 to prevent the cleaning liquid from flowing backwards, resulting in unclean capillary tube cleaning.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The cleaning joint for the gas chromatography comprises a first joint (1) and a second joint (3), and is characterized in that the first joint (1) and the second joint (3) are fixedly connected through a middle connecting cylinder (2), a rotating nut (4) is sleeved on the outer wall of the first joint (1), a plurality of thread rings (5) are arranged on the outer wall of the first joint (1), the rotating nut (4) is matched with the thread rings (5), the top of the first joint (1) is divided into four splicing blocks (7) through quartering tangent lines (6), limiting edges (71) are fixedly connected on the outer wall of each splicing block (7), silica gel blocks (8) are fixedly connected on the inner wall of each splicing block (7), funnel-shaped inclined channels (9) are arranged inside the second joint (3), plugs (10) are arranged in the inclined channels (9), and supporting plates (11) are fixedly connected between the inner walls of the connecting cylinders (2), the bottom of the supporting plate (11) is connected with the plug (10) through a spring (12).

2. The cleaning joint for gas chromatography as recited in claim 1, wherein the cross section of the connecting cylinder (2) is designed to be an oval structure, and the diameters of the inner walls of the connecting cylinder (2) are larger than those of the inner walls of the first joint (1) and the second joint (3).

3. A cleaning joint for gas chromatography according to claim 1, characterized in that the outer wall of the rotating screw cap (4) is provided with a circle of anti-slip stripes (41).

4. The cleaning joint for gas chromatography as claimed in claim 1, wherein the four pieces (7) are designed to be bent outwards, and the diameter of the inner wall of the circular channel surrounded by the four pieces (7) is designed to be gradually reduced from top to bottom.

5. A cleaning joint for gas chromatography according to claim 1, characterized in that the surface of the support plate (11) is provided with a plurality of gas-permeable openings (13).

6. The cleaning joint for gas chromatography as recited in claim 1, wherein an internal threaded interface is formed on the inner wall of the second joint (3) channel.