Air tightness knob of needle cylinder injector

Abstract

The utility model discloses a needle cylinder injector air tightness knob which comprises a base plate and a rotating plate, the base plate is connected with the rotating plate through a rotating shaft, a first round hole is formed in the base plate, a second round hole is formed in the rotating plate, and the distance from the center point of the first round hole to the center line of the rotating shaft is the same as the distance from the center point of the second round hole to the center line of the rotating shaft. And an alternative nipple is arranged on the second round hole. According to the utility model, gas is allowed or prevented from entering and exiting in a manner of rotating the rotating disc, and ventilation cannot be carried out when the first round hole in the base plate and the second round hole in the rotating disc do not form a through hole, so that the gas tightness and the safety during gas inlet in a gas chromatography experiment are greatly improved, and the practicability is relatively high.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental instrument auxiliary devices, and in particular relates to an airtight knob for a syringe. Background Art

[0002] The syringe is a high-precision laboratory instrument, widely used in injection, aspiration, and preparation operations in the fields of biology, chemistry, and medicine. It has the advantages of transparency, corrosion resistance, and easy cleaning, which ensures the accuracy and reliability of the experimental results. The glass syringe is a commonly used gas intake instrument in gas phase experiments, consisting of a syringe body, a piston shaft handle, a nipple, and an aluminum foil. In the determination of non-methane total hydrocarbons in ambient air, the glass syringe can accurately extract and inject sample gas, avoiding cross contamination and sample loss, and ensuring the accuracy and precision of the experimental results. However, the sealing of the syringe may be insufficient, especially after repeated use, the sealing will decrease, resulting in gas leakage or sample contamination, which will affect the accuracy of the experiment and may even cause the experiment to fail. Utility Model Content

[0003] Technical problems solved: In view of the above technical problems, the utility model provides a syringe airtightness knob, which greatly improves the accuracy and safety of experiments, is more conducive to operation, and has strong practicality.

[0004] Technical solution: A syringe airtightness knob comprises a base and a rotating disk, wherein the base and the rotating disk are connected via a rotating shaft, a first circular hole is provided on the base, a second circular hole is provided on the rotating disk, the center points of the first circular hole and the second circular hole are at the same distance from the center line of the rotating shaft, and a replacement nipple is provided on the second circular hole.

[0005] Preferably, the airtight knob is connected to the nipple of the syringe through the first circular hole.

[0006] Preferably, the replacement nipple is the same size as the nipple of a syringe injector.

[0007] Preferably, the base plate and the rotating plate are both polypropylene discs, and the base plate and the rotating plate are of the same size.

[0008] Preferably, the rotating shaft is an aluminum alloy rotating shaft.

[0009] Beneficial effects: The utility model provides a syringe injector airtightness knob, which allows or prevents the entry and exit of gas by rotating the rotating disk. When the first circular hole on the bottom plate and the second circular hole on the rotating disk do not form a through hole, ventilation is impossible, which greatly improves the airtightness and safety of gas chromatography experiment air intake and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the syringe of the utility model;

[0011] Figure 2 It is a schematic diagram of the connection between the airtight knob and the syringe of the utility model;

[0012] Figure 3 It is a cross-sectional schematic diagram of the airtight knob of the utility model;

[0013] Serial numbers in the figure: 1. syringe body, 2. piston shaft handle, 3. nipple, 4. aluminum foil, 5. chassis, 6. rotating disk, 7. rotating shaft, 8. round hole, 9. replacement nipple. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings. Example 1

[0015] Reference Figure 1-3 , a syringe airtight knob, the syringe comprises a syringe body 1, a nipple 3 is provided at the closed end of the syringe body 1, a piston shaft handle 2 is provided at the open end of the syringe body 1, an aluminum foil 4 is provided between the piston shaft handle 2 and the closed end of the syringe body 1, the airtight knob comprises a chassis 5 and a rotating disk 6, the chassis 5 and the rotating disk 6 are connected by a rotating shaft 7, a first circular hole 8 is provided on the chassis 5, a second circular hole is provided on the rotating disk 6, the first circular hole 8 and the second circular hole have the same distance from the center point to the center line of the rotating shaft, and can be connected into a through hole by rotation, and a replacement nipple 9 is provided on the second circular hole to facilitate the wearing and removing of the needle, without the trouble of taking and wearing the knob; the airtight knob is connected to the nipple 3 of the syringe through the first circular hole 8.

[0016] The size of the replacement nipple 9 is the same as the nipple 3 of the syringe.

[0017] The base plate 5 and the rotating plate 6 are both polypropylene discs with a diameter of 25 mm and a thickness of 5 mm, which are relatively thick and convenient for directly manually operating the rotating plate 6 to control the air inlet and outlet of the syringe.

[0018] The above-mentioned rotating shaft 7 is an aluminum alloy rotating shaft, which has certain strength and durability and is more suitable for a lighter polypropylene knob, so as to achieve the effect of rotating the knob and reduce the burden.

[0019] The airtight knob is made of polypropylene material, which is firmly and burden-free when put on the syringe nipple. It inherits the excellent properties of plastic, is not easy to break when worn, and is durable. The chemical properties are relatively stable and it is not easy to react with gas and most other chemicals.

[0020] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A syringe airtightness knob, characterized in that: The invention comprises a base plate (5) and a rotating plate (6), wherein the base plate (5) and the rotating plate (6) are connected via a rotating shaft (7), a first circular hole (8) is provided on the base plate (5), and a second circular hole is provided on the rotating plate (6), the distances from the center points of the first circular hole (8) and the second circular hole to the center line of the rotating shaft are the same, and a replacement nipple (9) is provided on the second circular hole.

2. The airtight knob for a syringe according to claim 1, characterized in that: The airtight knob is connected to the nipple (3) of the syringe via the first circular hole (8).

3. The airtight knob for a syringe according to claim 1, characterized in that: The size of the replacement nipple (9) is the same as the size of the nipple (3) of the syringe.

4. The airtight knob for a syringe according to claim 1, characterized in that: The base plate (5) and the rotating plate (6) are both polypropylene discs, and the base plate (5) and the rotating plate (6) are of the same size.

5. The airtight knob for a syringe according to claim 1, characterized in that: The rotating shaft (7) is an aluminum alloy rotating shaft.

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