CN212219050U

CN212219050U - Liquid nitrogen tank neck stopper

Info

Publication number: CN212219050U
Application number: CN202020141261.6U
Authority: CN
Inventors: 石昌平
Original assignee: Shandong Xuhong New Material Co ltd
Current assignee: Shandong Xuhong New Material Co ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-12-25
Anticipated expiration: 2030-01-20

Abstract

The utility model relates to a liquid nitrogen tank accessory technical field, in particular to liquid nitrogen tank neck stopper, the material of neck stopper be the EPP material, the neck stopper pass through mould foaming shaping, the utility model discloses a neck stopper EPP material, and because outside one deck cortex, consequently be difficult to dirty, and can wash, longe-lived, difficult disconnected, not fragile.

Description

Liquid nitrogen tank neck stopper

Technical Field

The utility model relates to a liquid nitrogen container accessory technical field, in particular to liquid nitrogen container neck stopper.

Background

The liquid nitrogen container neck plug in the prior art generally adopts two kinds of materials, one kind is the polypropylene ethylene, through the foaming shaping, but this kind of material density can not reach the requirement, it is fragile, easily dirty, be difficult to wash, another kind of material is polyurethane, through two ingredient foaming shaping, but polyurethane is foaming from bottom to top at the foaming in-process, therefore whole density is inhomogeneous, the gap is great, fracture easily in the use, can produce dust or powder after the fracture and drop, produce the pollution to liquid nitrogen container inside, in actual foaming process, no matter be polypropylene ethylene or polyurethane, all can add the foamer at the foaming process, but all can have about 10% ~ 20% foamer to remain in the neck plug after the foaming is accomplished, like this, the foamer that remains in the neck plug can produce chemical pollution to biological sample etc. in the liquid nitrogen.

In the prior art, a turning processing mode is adopted, but the surface of the turned neck plug is not skinned and is in a spongy porous structure, so that the neck plug (especially with a large aperture) can adsorb liquid nitrogen and volatilize the liquid nitrogen.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the neck plug of the liquid nitrogen tank existing in the prior art is easy to break and easy to damage, the utility model provides a neck plug of the liquid nitrogen tank which is not easy to break.

The utility model provides a technical scheme that its technical problem adopted is:

the neck plug of the liquid nitrogen tank is made of EPP materials, and is formed through foaming by a mold.

Furthermore, the surface of the neck plug is provided with a skinning layer which is formed by heating and welding after contacting with a mould, and the density of the skinning layer is greater than that of the material in the neck plug.

Furthermore, the side surface of the neck plug is provided with a salient point area matched with the steam air hole of the mould.

Furthermore, the salient point areas are arranged at intervals along the length direction of the neck plug, and the salient point areas in the same cross section are uniformly distributed along the circumferential direction of the neck plug. The convex point area increases the friction force and enhances the sealing effect.

Has the advantages that:

(1) the neck plug of the utility model is made of EPP material, which is not easy to break and damage;

(2) the neck plug further ensures the advantage of uneasy breaking because of the outer layer of the crust layer, the crust layer is formed, the powder can not fall off, and the neck plug is not easy to be dirty, can be cleaned and has long service life;

(3) the outer surface of the neck plug of the utility model is provided with the crust layer with larger density, which can not adsorb liquid nitrogen, reduce volatilization and prolong the heat preservation days;

(4) the friction force increased by the salient point area has better sealing effect;

(5) the neck plug of the utility model uses the vapor to foam, and the problem of pollution of the foaming agent in the prior art to the liquid nitrogen tank can not be existed.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a perspective view of a neck plug according to the present invention;

fig. 2 is a longitudinal sectional view of the neck plug of the present invention.

Wherein, 1, neck plug, 11, cortex, 13, salient point area.

Detailed Description

Referring to fig. 1-2, a neck plug 1 of a liquid nitrogen tank is made of EPP material, which is a foamed polypropylene material, and EPP is a polypropylene plastic foamed material, which is a high-crystallinity polymer/gas composite material with excellent performance, and the unique and superior performance of the EPP material becomes the environment-friendly novel compression-resistant buffering and heat-insulating material which grows fastest at present. The EPP has light specific gravity, good elasticity, shock resistance, compression resistance, high deformation recovery rate, good absorption performance, oil resistance, acid resistance, alkali resistance, resistance to various chemical solvents, no water absorption, insulation and heat resistance, and the neck plug 1 is formed by foaming through a mould. Generally, EPP beads are first pressurized in a pressure-bearing tank (i.e., the beads are filled with air under a certain pressure), then compressed air is injected into a mold of an EPP molding machine through a spray gun, and steam is introduced to further expand the EPP beads to be fused with the contact surface of the preheated mold for molding. And after cooling, stabilizing the mould at a certain temperature to obtain the EPP product. As described above, the surface of the neck stopper 1 has the skinned layer 11 formed by heat fusion after contacting the mold, and the density of the skinned layer 11 is higher than that of the material inside the neck stopper 1.

The side of the neck closure 1 has a bump area 13 that matches the steam vent of the mould. Alternatively, the vapor vents of the mold may be either vented or vented, during which the bump regions 13 are formed.

The salient point areas 13 are arranged at intervals along the length direction of the neck plug 1, and the salient point areas 13 in the same cross section are uniformly distributed along the circumferential direction of the neck plug 1. This results in uniform circumferential friction.

It should be understood that the above description of the specific embodiments is only for the purpose of explanation and not for the purpose of limitation. Obvious changes or variations caused by the spirit of the present invention are within the scope of the present invention.

Claims

1. The liquid nitrogen tank neck plug is characterized in that the neck plug (1) is made of EPP materials, the neck plug (1) is formed through foaming by a mold, a skinning layer (11) formed by heating and welding after contacting the mold is arranged on the surface of the neck plug (1), and the density of the skinning layer (11) is greater than that of the materials in the neck plug (1).

2. A liquid nitrogen tank neck closure as claimed in claim 1, wherein: the side surface of the neck plug (1) is provided with a convex point area (13) matched with a steam air hole of the mould.

3. A liquid nitrogen tank neck closure as claimed in claim 2, wherein: the bump areas (13) are arranged at intervals along the length direction of the neck plug (1), and the bump areas (13) in the same cross section are uniformly distributed along the circumferential direction of the neck plug (1).