Protective cover for a needle filter device

Abstract

The utility model provides a kind of protective cover for needle type filter device, it includes cylindrical cover, the cylindrical cover has elasticity, the lower end of the cylindrical cover is open, the upper end of the cylindrical cover has sealing plate, the sealing plate is provided with through-hole, the diameter of the through-hole is less than the outer diameter of needle cylinder, the sealing plate is set in the needle cylinder outside by the through-hole;The lower end of the cylindrical cover extends to the lower of the connecting place of needle cylinder and needle type filter.The utility model can be set in needle cylinder and the connecting place of needle cylinder and needle type filter outside by through-hole, so even if extraction solution is sprayed from the connecting place of needle cylinder and needle type filter, it will be blocked by cylindrical cover, and then flow to extraction container along the inner wall of cylindrical cover, without splashing out of cylindrical cover, so that the face and other exposed parts of the body of detection personnel are better avoided from splashing extraction solution, improve the safety during extraction, ensure the health of detection personnel.

Description

Technical Field

[0001] This utility model belongs to the field of tobacco detection technology, specifically relating to a protective cover for a needle filter device. Background Technology

[0002] In routine tobacco analysis and testing, before liquid chromatography and gas chromatography analysis, the sample extraction solution is often filtered and purified using a syringe with a needle filter to prevent contamination of the injection port and chromatographic column. However, when using a needle filter to filter the extraction solution, if there are many impurities, it can overload the filter membrane, preventing the extraction solution from passing through. Pushing the plunger downwards can cause the extraction solution to spray out from the connection between the syringe and the needle filter, easily splashing onto the surrounding area and the body of the testing personnel, thus endangering their health.

[0003] Therefore, how to design a protective cover for a needle filter device to better protect the connection between the syringe and the needle filter and prevent the extraction solution from splashing onto the body of the testing personnel has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a protective cover for a needle filter device to solve the above-mentioned technical problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A protective cover for a needle filter includes a cylindrical cover that is elastic, an open lower end, and a sealing plate at the upper end of the cylindrical cover. The sealing plate has a through hole with a diameter smaller than the outer diameter of the syringe. The sealing plate is fitted over the syringe through the through hole. The lower end of the cylindrical cover extends below the connection between the syringe and the needle filter.

[0007] Preferably, the inner diameter of the cylindrical cover is 2 cm to 4 cm larger than the outer diameter of the syringe.

[0008] Preferably, the inner diameter of the cylindrical cover is 3 cm larger than the outer diameter of the syringe.

[0009] Preferably, the through hole is located in the middle of the sealing plate.

[0010] Preferably, the cylindrical cover has a vertical height of 3 cm to 6 cm.

[0011] Preferably, the diameter of the through hole is 2mm to 3mm smaller than the outer diameter of the syringe.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention provides a protective cover for a needle filter device. The cover, through a through-hole, is fitted over the syringe barrel and the connection between the syringe barrel and the needle filter. In the event of filter membrane overload, even if the extraction solution sprays out from the connection between the syringe barrel and the needle filter, it will be blocked by the cylindrical cover and flow along the inner wall of the cover into the extraction container, preventing splashing out of the cover. This effectively prevents the extraction solution from splashing onto the face and other exposed parts of the testing personnel's body. Therefore, this invention provides excellent protection at the connection between the syringe barrel and the needle filter, preventing the extraction solution from splashing onto the testing personnel's body, improving safety during extraction, and ensuring the health of the testing personnel. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly described below, and the specific embodiments of this utility model will be further described in detail with reference to the drawings.

[0015] Figure 1 A schematic diagram of the protective cover for the needle filter device provided in this embodiment of the utility model during use;

[0016] Figure 2 A schematic diagram of a protective cover for a needle filter device provided in an embodiment of this utility model;

[0017] Figure 3 Another schematic diagram of a protective cover for a needle filter device provided in an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of a needle filter device provided in an embodiment of the present invention.

[0019] Marked in the attached diagram:

[0020] 11. Syringe; 12. Needle filter; 13. Syringe;

[0021] 14. The connection between the syringe and the needle filter; 15. The push rod;

[0022] 21. Cylindrical cover; 22. Sealing plate; 23. Through hole. Detailed Implementation

[0023] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0024] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0025] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0026] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0027] like Figures 1 to 4 As shown, this utility model embodiment provides a protective cover for a needle filter device, which includes a cylindrical cover 21. The cylindrical cover 21 is elastic, the lower end of the cylindrical cover is open, and the upper end of the cylindrical cover has a sealing plate 22. The sealing plate 22 is provided with a through hole 23. The diameter of the through hole 23 is smaller than the outer diameter of the syringe 13. The sealing plate is sleeved on the outside of the syringe through the through hole. The lower end of the cylindrical cover extends to below the connection 14 between the syringe 13 and the needle filter 12.

[0028] The protective cover for the needle filter device provided in this embodiment of the invention can be fitted over the syringe and the connection 14 between the syringe and the needle filter through the through hole 23. In the event of filter membrane overload, even if the extraction solution sprays out from the connection 14 between the syringe and the needle filter, it will be blocked by the cylindrical cover 21 and flow along the inner wall of the cylindrical cover 21 into the extraction container without splashing out of the cylindrical cover. This effectively prevents the extraction solution from splashing onto the face and other exposed parts of the testing personnel's body. Therefore, this invention can effectively protect the connection between the syringe and the needle filter, preventing the extraction solution from splashing onto the testing personnel's body, improving safety during extraction, and ensuring the health of the testing personnel.

[0029] Furthermore, the inner diameter of the cylindrical cover 21 is 2 cm to 4 cm larger than the outer diameter of the syringe.

[0030] Preferably, the inner diameter of the cylindrical cover 21 is 3 cm larger than the outer diameter of the syringe 13. It is understood that the outer diameter of the syringe is the same as the diameter of the needle filter, or the outer diameter of the syringe is larger than the diameter of the needle filter.

[0031] Furthermore, the through hole 23 is located in the middle of the sealing plate 22, that is, the through hole is coaxially arranged with the sealing plate and the cylindrical cover.

[0032] Preferably, the cylindrical cover 21 has a vertical height of 3 cm to 6 cm. It is understood that the height of the cylindrical cover can be flexibly set as needed, as long as the lower end of the cylindrical cover covers the connection between the syringe and the needle filter, preventing the extraction solution from splashing outwards. During analysis and testing, personnel generally wear gloves, which effectively protect their hands. When using the syringe, one hand can hold the upper end of the syringe while the other hand pushes the plunger.

[0033] Specifically, the diameter of the through hole 23 is 2mm to 3mm smaller than the outer diameter of the syringe, so that the sealing plate can be easily fitted onto the outside of the syringe 13 through the through hole in an interference fit manner. The friction between the inner wall of the through hole and the outer wall of the syringe makes it difficult for the cylindrical cover to slip off the syringe. At the same time, since the cylindrical cover is elastic, the interference fit can be achieved well, and it is also easy to remove the cylindrical cover from the syringe.

[0034] The protective cover for the needle filter device provided by this utility model can prevent the testing personnel from directly contacting chemical reagents when filtering the extraction solution with a needle filter. This protects the health of the testing personnel. The cover is also washable and reusable. The structure is simple and novel and has certain value for promotion and application.

[0035] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A protective cover for a needle-type filter device, characterized in that, It includes a cylindrical cover that is elastic, the lower end of the cylindrical cover is open, the upper end of the cylindrical cover has a sealing plate with a through hole, the diameter of the through hole is smaller than the outer diameter of the syringe, and the sealing plate is fitted over the syringe through the through hole; the lower end of the cylindrical cover extends to below the connection between the syringe and the needle filter.

2. The protective cover for the needle filter device according to claim 1, characterized in that, The inner diameter of the cylindrical cover is 2 cm to 4 cm larger than the outer diameter of the syringe.

3. The protective cover for the needle filter device according to claim 2, characterized in that, The inner diameter of the cylindrical cover is 3 cm larger than the outer diameter of the syringe.

4. The protective cover for the needle filter device according to claim 1, characterized in that, The through hole is located in the middle of the sealing plate.

5. The protective cover for the needle filter device according to claim 1, characterized in that, The cylindrical cover has a vertical height of 3 cm to 6 cm.

6. The protective cover for the needle filter device according to any one of claims 1 to 5, characterized in that, The diameter of the through hole is 2mm to 3mm smaller than the outer diameter of the syringe.

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