CN210119475U - A gas chromatography-mass spectrometry interface sealing and pressing ring pressing device - Google Patents

Abstract

The utility model relates to a gas chromatography-mass spectrometry interface sealing and pressing ring pressing device, comprising a coupling body, a mandrel, a limiting nut and a washer, which are used as a capillary chromatographic column (referred to as a chromatographic column for short) in a gas chromatography-mass spectrometer combined instrument. The same below) It is used to compress the sealing ring at the interface with the interface, so as to realize the sealing between the vacuum system and the external air at the interface. Its characteristics are: the connecting body is respectively connected with the interface and the ejector rod; the ejector rod has a groove in the axial direction and a boss at one end, and the boss pushes the gasket and the sealing pressure ring to the interface to achieve sealing; the limiting nut is tightened. On the top of the ejector rod, it is used to limit the swing of the column. This device seals effectively, preventing heavy metal objects such as nuts from acting on the column and causing it to be scratched or even broken when the column is disassembled.

Description

A gas chromatography-mass spectrometry interface sealing and pressing ring pressing device

technical field

The utility model relates to a gas chromatography-mass spectrometry interface sealing and pressing ring pressing device, which belongs to a testing laboratory instrument component.

Background technique

In the gas chromatography-mass spectrometer, the chromatographic column extends into the vacuum chamber of the mass spectrometer, and the interface is sealed with a sealing ring to prevent air leakage. Tighten the sealing ring with the interface nut. The advantages of this method are: simple structure and good compression effect. However, when the chromatographic column needs to be removed from the interface, it is not easy to be removed because the sealing pressure ring is tightly attached to the chromatographic column, and as long as the sealing pressure ring remains on the chromatographic column, the interface nut sleeved on the chromatographic column cannot be removed. . Therefore, when disassembling, or when deciding to reuse the sealing ring after only replacing the chromatographic column, the operator must be careful and skilled enough, otherwise the chromatographic column will be easily damaged or even broken due to the gravity of the interface nut.

SUMMARY OF THE INVENTION

The utility model can partially maintain and develop the above-mentioned advantages and overcome the above-mentioned existing problems, and provides a gas chromatography-mass spectrometry interface sealing and pressing ring pressing device which is convenient to use and effective in pressing.

The technical solution of the present invention is as follows.

1. There are internal threads at both ends of the connecting body, which can be connected with the interface and the ejector rod respectively; there is a sealing pressure ring restraint tube in the middle, and the inner diameter is 0.5mm larger than the diameter of the sealing pressure ring to prevent the sealing pressure ring from being under pressure and high temperature. Lateral displacement.

2. The washer is a disc with the same diameter as the sealing ring, 1mm thick, and a circular hole with a diameter of 1mm in the middle.

3. The large end of the ejector rod is a screw, which can be screwed into the limiting nut; the small end is a boss, the boss has no thread, which is used to push the washer and the sealing pressure ring; the back of the boss is a screw, which can be Screw it into the connecting body; there is an axial groove with a width of 0.7mm on the ejector rod, in which the chromatographic column can move; in order to facilitate the turning of the ejector rod, there is a wrenching groove in the middle of the screw rod.

4. The limiting nut has a horn-shaped opening in the axial direction. The inner diameter of the smallest opening is larger than the diameter of the sealing pressure ring, and the gasket and the sealing pressure ring can easily pass through it; the limiting nut is used to limit the swing of the chromatographic column. Reduces the chance of the column being scratched by the ejector grooves.

5. When installing the column, tighten the connecting body on the interface; insert the gasket and the sealing pressure ring on the end of the connection between the chromatographic column and the interface in turn, measure the length of the column that should be inserted into the interface, and make a mark; Slide the head over the limiting nut and over the seal ferrule and gasket; carefully move the column end together with the seal ferrule and gasket into the coupling body, continue to push the column into the interface; take the ejector rod and move it towards the column and make it Enter into the groove of the ejector rod, the end with the boss is facing the coupling body, then tighten the limiting nut on the screw rod of the ejector rod, screw the other end of the screw rod into the coupling body, and push the washer and the sealing ring into the confinement tube , screw it tightly by hand, push the chromatographic column to the predetermined depth, and finally turn the ejector rod with a wrench to seal well.

6. When dismantling the column, reverse the operation, the column can be easily taken out, and it can be separated from the ejector rod and the limiting nut.

The coupling body, ejector rod, limiter nut and washer described above are all made of brass or stainless steel.

The same point of the utility model and the prior art is that the sealing pressure ring is tightened by screwing in the thread.

The difference between the utility model and the prior art is that when the chromatographic column needs to be removed from the interface, both the ejector rod and the limiting nut can be removed from the chromatographic column, which can prevent metal heavy objects such as the nut from covering. on the chromatographic column, causing it to be scratched or even broken.

Description of drawings

Figure 1 is a schematic diagram of the connection of each component of the present invention.

FIG. 2 is a cross-sectional view of the coupling body.

Figure 3 is a front view of the ejector rod.

FIG. 4 is a top view of the ejector rod.

Figure 5 is a left side view of the ejector rod.

FIG. 6 is a cross-sectional view of the limiter nut.

In Figures 1 to 6, the coupling body (1), the ejector rod (2), the limiting nut (3), the gasket (4), the sealing pressure ring (5), the interface (6), and the chromatographic column (7) , restraint tube (11), boss (21), groove (22), wrench groove (23).

Detailed ways

Referring to the shape and structure of FIGS. 1 to 6 , it is implemented in the following steps.

1. Connecting body 1: The shape is a hexagonal tubular body with internal threads at both ends, which can be connected with the interface 6 and the ejector rod 2 respectively; In order to avoid lateral displacement under pressure and high temperature, the diameter of the constraining tube 11 is 0.5 mm larger than the diameter of the sealing pressure ring 5 .

2. Gasket 4: It is a circular piece with the same diameter as the sealing ring 5, with a thickness of 1mm to ensure that it will not be deformed when being squeezed; there is a circular hole with a diameter of 1mm in the middle of the gasket 4.

3. Mandrel 2: It is a screw with a wrench groove 23 and a groove 22 with a width of 0.7mm in the axial direction. One end of the screw is a boss 21, which is used to push the sealing pressure ring 5 through the washer 4 to achieve The sealing between the interface 6 and the outer wall of the chromatographic column 7; the chromatographic column 7 can move in the groove 22; Screw it into the limiter nut 3 to connect it.

4. Limiting nut 3: It is a nut with a flared opening. The inner diameter of the smallest opening is larger than the diameter of the sealing pressure ring 5, so that the gasket 4 and the sealing pressure ring 5 can easily pass through it; the limiting nut 3 It is used to limit the swinging amplitude of the chromatographic column 7 and reduce the probability that the chromatographic column 7 is scratched by the groove 22 of the ejector rod 2 .

5. Use of the utility model: Column loading: tighten the coupling body 1 on the interface 6; insert the gasket 4 and the sealing pressure ring 5 on one end of the chromatographic column 7 connected with the interface 6 in sequence, and measure the chromatographic column 7 to be used. Insert the length of the interface 6 and make a mark; put the limiting nut 3 into the end of the chromatographic column 7 and pass over the sealing pressure ring 5 and the gasket 4; carefully put the head end of the chromatographic column 7 together with the sealing pressure ring 5 and the gasket 4 Move into the coupling body 1, continue to push the chromatographic column 7 into the interface 6; take the ejector rod 2 and move it towards the chromatographic column 7 and make it enter the groove 22 of the ejector rod 2, and then tighten the limiting nut 3 on the ejector rod 2; the end of the ejector rod 2 with the boss 21 is screwed into the coupling body 1, the gasket 4 and the sealing pressure ring 5 are pushed into the restraint tube 11, and tightened by hand; Turn the mandrel 2 with a wrench to seal well. Remove the column: loosen the coupling body 1 three turns counterclockwise; turn the ejector rod 2 two turns clockwise with a wrench to eliminate the possible adhesion between the sealing pressure ring 5 and the restraint tube 11. Unscrew the limiting nut 3, unscrew the ejector pin 2 and remove it; hold the chromatographic column 7 and pull it out lightly, and remove the limiting nut 3. If the sealing pressure ring 5 is adhered to the interface 6, it is only necessary to unscrew the coupling body 1 and gently pull the sealing pressure ring 5 to separate the two.

Claims (1)

1. A gas chromatography-mass spectrometry interface sealing and pressing ring pressing device, comprising a coupling body (1), a mandrel (2), a limiter nut (3) and a washer (4), characterized in that: the described The connecting body (1) has internal threads at both ends, one end is connected to the interface (6) and the other end is connected to the ejector rod (2). The inner diameter is 0.5mm larger than the diameter of the sealing pressure ring (5). One end of 21) is connected with the connecting body (1), and the other end is connected with the limiting nut (3). A circular hole with a diameter of 1mm is placed between the boss (21) and the sealing pressure ring (5) during operation; the limiting nut (3) has a flared opening in the axial direction, and the inner diameter of the smallest opening is Greater than the diameter of the sealing ring (5).

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