CN206930634U - A kind of sealing of capillary chromatographic column and fixing device - Google Patents

Abstract

The utility model discloses a sealing and fixing device for a capillary chromatographic column, which comprises a nut body (1), a graphite sealing washer (3), a push rod (4) and a nut cap (5) connected from top to bottom , wherein, the central axis of the nut body (1), the graphite sealing gasket (3), and the push rod (4) is provided with cylindrical passages, and these cylindrical passages are used to place capillary chromatographic columns; In addition, the nut cap (5) also has a through hole for fixing the graphite sealing washer (3) and the push rod (4). Compared with the prior art, the utility model can effectively solve the problem that the graphite sealing pressure ring is stuck on the inner groove of the nut cap and is inconvenient to be taken out by improving the structure (especially the internal structure) and the setting method of the key components in the device. problem, thereby facilitating the replacement of graphite ferrules.

Description

A sealing and fixing device for a capillary chromatographic column

technical field

The utility model belongs to the field of gas chromatography, and more specifically relates to a sealing and fixing device for a capillary chromatography column.

Background technique

In gas chromatography, it is often necessary to seal and fix the capillary chromatographic column at a specific position, such as sealing the capillary chromatograph, fixing it to the inlet or detector of the gas chromatograph. The principle of the existing method is the same as that of the ferrule joint. During use, the capillary chromatographic column needs to pass through a hollow screw (called on the gas chromatograph) with an inner groove (the groove is used to place the graphite sealing gasket) successively. It is a nut cap, the nut cap is used to fix the graphite sealing washer), the graphite sealing washer and the nut body whose position has been fixed, the nut cap or the nut body contains a tapered groove, and the angle of the cone angle is the same as the cone angle on the graphite pressure ring The same, the two can match each other. After the nut body and the nut cap are tightened, the graphite sealing gasket (especially at the cone angle) can be pressed and deformed, so that the capillary chromatographic column can be grasped and fixed. The prominent advantage of this method is hermeticity, that is, the capillary chromatographic column and the nut body can form a sealed space isolated from the external environment. The disadvantage of this method is that the deformed graphite sealing gasket is often stuck on the inner groove of the nut cap and is not easy to take out, and it is inconvenient to replace the graphite sealing gasket.

Utility model content

In view of the above defects or improvement needs of the prior art, the purpose of this utility model is to provide a sealing and fixing device for a capillary chromatographic column, in which the structure (especially the internal structure) and the setting method of its key components are improved , compared with the prior art, it can effectively solve the problem that the graphite sealing gasket is stuck on the inner groove of the nut cap and is inconvenient to take out, thereby facilitating the replacement of the graphite sealing gasket.

In order to achieve the above object, according to the utility model, a sealing and fixing device for a capillary chromatographic column is provided, which is characterized in that it includes a nut body (1) connected from top to bottom, a graphite sealing gasket (3), a push Rod (4), and nut cap (5), wherein, the central axis of the nut body (1), the graphite sealing washer (3), and the push rod (4) is provided with a cylindrical channel, These cylindrical channels are used to accommodate capillary columns;

In addition, the nut cap (5) also has a through hole for fixing the graphite sealing washer (3) and the push rod (4).

As a further preference of the present utility model, the push rod (4) includes two cylinders with different diameters, the two cylinders are fixedly connected and coaxially arranged, and the cylinder with a larger diameter in the two cylinders is Large cylinder (42), the smaller cylinder of diameter is small cylinder (43), then described large cylinder (42) is fixedly connected with described small cylinder (43) from top to bottom, and in this small A second tapered groove (44) is also arranged on the lower bottom surface of the cylinder (43); the height of the push rod (4) is greater than the height of the nut cap (5).

As a further preference of the present utility model, a cylindrical nut (13) is arranged inside the nut body (1), and the cylindrical nut (13) is located on the lower end surface of the nut body (1), so that the nut body A cylindrical threaded groove is formed on the lower surface of (1); and a first tapered groove (12) is also provided above the cylindrical nut (13).

As a further preference of the present utility model, the graphite sealing gasket (3) includes a conical protrusion (32) and a first cylinder (33) fixedly connected from top to bottom, wherein the conical protrusion (32) The diameter of the bottom surface of the first cylinder (33) is equal to the diameter of the first cylinder (33), and the diameter of the first cylinder (33) is the same as the diameter of the large cylinder (42).

As a further preference of the present utility model, the nut cap (5) includes a fifth cylinder and an operation block fixedly connected from top to bottom, the operation block is used to rotate the nut cap (5), and the fifth cylinder The body is used to cooperate with the cylindrical nut (13), and the outer surface of the fifth cylindrical body is provided with a screw thread that matches the thread of the cylindrical nut (13); on the fifth cylindrical body There is a cylindrical groove in the inside, the central axis of the cylindrical groove coincides with the central axis of the fifth cylinder, and is used to accommodate the first cylinder (33) and the large cylinder (42) ; In addition, the diameter of the cylindrical groove is 0 to 0.5 mm larger than the diameter of the first cylinder (33), and the depth of the cylindrical groove is larger than that of the first cylinder (33) and the larger The sum of the heights of the two cylinders (42) is small from 0 to 0.5 millimeters;

A cylindrical passage is also provided below the cylindrical groove, the central axis of the cylindrical passage coincides with the central axis of the cylindrical groove, and the diameter of the cylindrical passage is smaller than that of the large cylinder (42 ) is small and 0 to 1 mm larger than the diameter of said small cylinder (43);

The cylindrical groove together with the cylindrical channel constitutes the through hole in the nut cap (5).

As a further preference of the present invention, the taper angles of the tapered protrusion (32) and the first tapered groove (12) are equal in size.

Through the above technical scheme conceived by the utility model, compared with the prior art, due to the newly added push rod with a specific shape, and the internal space for accommodating the push rod has been increased in the nut cap (correspondingly, the inner cylinder of the nut cap The shape parameters such as the diameter and height of the groove and the cylindrical channel can also be optimized), and the interaction between the push rod and the graphite sealing gasket is used to make the graphite sealing gasket stuck in the inner groove of the nut cap easy to take out. The push rod in the utility model is made up of two cylinders of different sizes and whose central axis is on a straight line. There is a cylindrical channel on its central axis which can pass through the capillary chromatographic column; the existence of the push rod does not It affects the fixing and sealing of the capillary chromatographic column on the nut body, and helps to push out the graphite sealing gasket stuck on the groove of the nut cap due to deformation.

When the sealing and fixing device of the capillary chromatographic column in the utility model is actually used, one end with a smaller diameter of the push rod can be pushed in from the groove of the nut cap, and the push rod can be installed and fixed in the nut cap; The cylindrical body of the graphite ferrule is pushed through the groove of the nut cap, and the graphite ferrule can be installed and fixed in the nut cap. When in use, install the push rod and graphite sealing gasket in the nut cap first, then pass the capillary column through the push rod, graphite sealing gasket and the capillary channel on the nut body in turn, and rotate the nut cap so that the nut cap rotates into the nut body And make the conical body of the graphite sealing gasket and the conical groove in the nut body squeeze each other so that the graphite sealing gasket (especially at the cone angle) is deformed due to pressure, and the capillary column can be fixed and sealed on the nut body; Rotating the nut body to rotate the nut cap out of the nut body can release the pressure on the graphite sealing gasket and restore the original shape to a certain extent, so that the capillary column can be pulled out; push the smaller diameter of the push rod A graphite ferrule that has been deformed and stuck in the groove of the nut cap can be pushed out at one end. The utility model can not only seal and fix the capillary chromatographic column, but also overcome the disadvantage that the graphite sealing gasket is stuck on the nut cap and is inconvenient to take out.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the sealing and fixing device of the capillary chromatographic column in the present invention.

Fig. 2 is a sectional view of the overall structure of the sealing and fixing device of the capillary chromatographic column in the utility model corresponding to Fig. 1 .

Fig. 3 is a schematic diagram of the connection of graphite sealing gasket, push rod and nut cap in the sealing and fixing device of the capillary chromatographic column in the present invention.

Fig. 4 is a sectional view corresponding to Fig. 3, a graphite sealing gasket, a push rod and a nut cap in the sealing and fixing device of the capillary chromatographic column of the present invention.

The meanings of the reference signs in the figure are as follows: 1 is the nut body; 11 is the capillary chromatographic column channel on the nut body; 12 is the tapered groove (ie the first tapered groove) on the nut body; 13 is the nut body 2 is the capillary chromatographic column; 3 is the graphite sealing gasket; 31 is the capillary chromatographic column channel on the graphite sealing gasket; 32 is the cone on the graphite sealing gasket; 33 is the cylindrical body on the graphite sealing gasket; 4 push Rod; 41 is the capillary column channel on the push rod; 42 is the large cylinder on the push rod; 43 is the small cylinder on the push rod; 44 is the tapered groove on the push rod (i.e. the second tapered groove ); 5 is a nut cap; 51 is a groove on the nut cap; 52 is a screw on the nut cap; 53 is a push rod channel on the nut cap; 54 is a knurl structure cylinder on the nut cap.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

As shown in Figures 1 to 4, a sealing and fixing device for a capillary chromatographic column according to the present invention comprises a nut body 1, a graphite sealing washer 3, a push rod 4 and a nut cap 5; in the nut body 1. The central axis of the graphite sealing gasket 3 and the push rod 4 each have a cylindrical passage (shown in 11, 31 and 41 in the figure) that can pass through the capillary chromatographic column 2, these passages are in On the same straight line; one end of the nut body 1 is fixed in the gas chromatograph (such as the inlet port or the detector end) and its opening shape matches its function of use (its specific shape has been omitted among the accompanying drawings), in addition One end is a cylindrical nut 13; there is a tapered groove 12 (cone angle facing inward) at the end of the nut 13 in the nut body 1; the central axis of the nut body 1 and the inner tapered groove The central axis of 12 and the central axis of the nut 13 are on the same straight line; one end of the graphite sealing gasket 3 is a cone 32, and the other end is a cylinder 33, the cone 32 is located on the side close to the nut body 1 and the cone 32 The angle of the taper angle is the same as the taper angle of the tapered groove 12 in the nut body 1; the push rod 4 is composed of two cylinders with different sizes and the central axis on the same straight line, wherein the diameter is larger The cylinder 42 is close to the cylinder 33 of the graphite sealing gasket 3 and its outer diameter is equal to the outer diameter of the graphite sealing gasket 3 cylinder 33; there is a taper at one end of the cylinder 43 with a smaller diameter in the push rod 4 The groove (taper angle facing inward) 44; The length of described push rod 4 is greater than the length of described nut cap 5; The end of described nut cap 5 is cylinder near described nut body 1 on the position, and this cylinder There is a screw 52 matching the nut in the nut body on the outside, and a cylindrical groove 51 inside, and the diameter of the groove 51 is 0 to 0.5 mm larger than the outer diameter of the cylinder 33 in the graphite sealing washer 3 , the depth of the groove 51 is 0 to 0.5 mm smaller than the sum of the heights of the cylinder 33 in the graphite sealing gasket 3 and the cylinder 42 with a larger diameter in the push rod 4, and the groove 51 is used to accommodate the graphite sealing gasket 3 The cylinder 42 with larger diameter in the cylinder 33 and the push rod 4; the other end of the nut cap 5 is a knurled structure cylinder 54 for rotating the nut cap (this knurled structure cylinder 54 is the concrete operation block structure), the nut cap 5 and the nut body 1 can be tightened or loosened by rotating the cylinder 54 by hand; a cylindrical passage 53 is arranged on the nut cap 5, and the diameter of the passage 53 is smaller than that of the push rod 4 The outer diameter of the larger cylinder 42 in the middle diameter is small and 0 to 1 mm larger than the smaller cylinder 43 outer diameter in the push rod 4; the central axis of the groove 51 on the nut cap 5, cylindrical The central axis of the channel 53 is on the same straight line as the central axis of the nut cap 5 .

Of course, with regard to the parts (i.e., the operating block) used to rotate the nut cap 5, there may be other structures in addition to the knurled structure cylinder 54 described above, such as an outer hexagonal structure, a quincunx structure and a butterfly structure, etc. Wait.

The working principle of the sealing and fixing device of the capillary chromatographic column in this embodiment is: push the end of the push rod 4 with a smaller diameter from the groove 51 of the nut cap 5, and the push rod 4 can be installed and fixed in the nut cap 5 ; Then the cylinder 33 of the graphite sealing gasket 3 is pushed in from the groove 51 of the nut cap 5, and the graphite sealing gasket 3 can be installed and fixed in the nut cap 5. During use, the push rod 4 and the graphite sealing washer 3 are first installed in the nut cap 5, and then the capillary chromatographic column 2 is sequentially passed through the capillary channel on the push rod 4, the graphite sealing washer 3 and the nut body 1 (respectively as shown in Fig. 41, 31 and 11), rotate the knurled structure cylinder 54 on the nut cap, make the nut cap 5 rotate into the nut body 1 and make the conical body 32 of the graphite sealing washer 3 and the conical groove 12 in the nut body 1 Extrude each other so that the graphite sealing gasket 3 (especially at the cone angle) is deformed due to pressure, so that the capillary column 2 can be fixed and sealed on the nut body 1; the knurled structure cylinder 54 on the nut body is rotated, and the nut The cap 5 rotates out from the nut body 1 to release the pressure on the graphite sealing gasket 3 and restore its original shape to a certain extent, so that the capillary chromatographic column 2 can be pulled out; push the smaller diameter of the push rod 4 One end just can push out the graphite sealing washer 3 that is stuck on the groove 51 of the nut cap 5 due to deformation.

The sealing and fixing device of the capillary chromatographic column in the utility model is composed of a nut body, a graphite sealing washer, a push rod and a nut cap. The nut body and the graphite sealing washer in the utility model can adopt a structure similar to that of the prior art.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (6)

1. sealing and the fixing device of a kind of capillary chromatographic column, it is characterised in that including for nut connected from top to bottom Body (1), graphite grazing packing ring (3), push rod (4) and nut cap (5), wherein, the nut body (1), the graphite grazing pad Cylindrical channel is provided with the axis of circle (3) and the push rod (4), these cylindrical channels are used to place capillary Pipe chromatographic column；

In addition, also there is through hole in the nut cap (5), for fixing the graphite grazing packing ring (3) and the push rod (4).

2. sealing and the fixing device of capillary chromatographic column as claimed in claim 1, it is characterised in that the push rod (4) includes The different cylinder of two pieces of diameters, this two pieces of cylinders are fixedly connected and are coaxially disposed, and remember and are relatively large in diameter in this two pieces of cylinders Cylinder be big cylinder (42), the less cylinder of diameter is small cylinder (43), then the big cylinder (42) and institute State small cylinder (43) to be fixedly connected from top to bottom, and the second taper is additionally provided with the bottom surface of the small cylinder (43) Groove (44)；The height of the push rod (4) is more than the height of the nut cap (5).

3. sealing and the fixing device of capillary chromatographic column as claimed in claim 2, it is characterised in that in the nut body (1) The nut (13) of cylinder is provided with, the barrel nut (13) is located on the lower surface of the nut body (1) so that the nut Thread groove of the lower surface of body (1) formed with cylinder；And it is additionally provided with first above the barrel nut (13) Conical socket (12).

4. sealing and the fixing device of capillary chromatographic column as claimed in claim 3, it is characterised in that the graphite grazing packing ring (3) tapered protrusion (32) and the first cylinder (33) being fixedly connected from top to bottom are included, wherein the tapered protrusion (32) Basal diameter is equal with both diameters of first cylinder (33), diameter and the great circle of first cylinder (33) The diameter of cylinder (42) is identical.

5. sealing and the fixing device of capillary chromatographic column as claimed in claim 4, it is characterised in that nut cap (5) bag Including the 5th cylinder and operating block being fixedly connected from top to bottom, the operating block is used to rotating the nut cap (5), and the described 5th Cylinder is used to coordinate with the barrel nut (13) and is connected, and is provided with the lateral surface of the 5th cylinder and the circle The screw thread that the screw thread of cylindricality nut (13) matches；There is cylinder shape groove in the inside of the 5th cylinder, the cylinder The central axis of the central axis of groove and the 5th cylinder coincides, and for accommodate first cylinder (33) with The big cylinder (42)；In addition, the diameter of the cylinder shape groove is bigger by 0 to 0.5 than the diameter of first cylinder (33) Millimeter, the first cylinder (33) described in the depth ratio of the cylinder shape groove and the height sum of both big cylinders (42) are small 0 to 0.5 millimeter；

Cylindrical channel is additionally provided with below the cylinder shape groove, the central axis of the cylindrical channel and the cylinder The central axis of connected in star coincides, and the diameter of the cylindrical channel is smaller than the big cylinder (42), and than the roundlet The diameter of cylinder (43) is big 0 to 1 millimeter；

The cylinder shape groove forms the through hole in the nut cap (5) together with the cylindrical channel.

6. sealing and the fixing device of capillary chromatographic column as claimed in claim 4, it is characterised in that the tapered protrusion (32) It is equal in magnitude with the cone angle of both first conical sockets (12).