CN87202333U - Safe valve needle - Google Patents

Abstract

The utility model discloses a safe valve needle, belonging to an auxiliary device used for the inflation of the inner tyre of a vehicle. The utility model solves the problem that the air of the inner tyre of a bicycle leaks through a valve nozzle. The utility model has the advantages of good sealing effect and simple structure. The safe valve needle can keep excellent sealed performance within the range of +-40 celsius degrees. The safe valve needle does not change the assembly structure of the existing valve nozzle. After an accessory is increased on a motor vehicle, the safe valve needle can also be adopted. The safe valve needle solves the problem that the air of the inner tyre leaks from the valve nozzle.

Description

Safe valve needle

Safe plunger belongs to the auxiliary device of inner tube of vehicles inflation usefulness.

Very easily from valve cock gas leakage, the gas leakage of the valve cock of old-fashioned General Construction has two approach to existing bicycle under the higher or lower situation of ambient temperature, and the first is by valve inside (glue core) endoporus, by the plunger inlet hole to external leakage.The 2nd, the conical surface of valve cock and the gas leakage of the contacting point of valve inside.When normal temperature, two places are generally all air tight, when temperature descends or is elevated to when the valve inside sponge leather is followed the string, all easily produce gas leak phenomenon.Now in the society just at popular a kind of improvement type plunger, its structure such as Fig. 1, it is an one-way valve structures, make by nylon with valve cock conical surface contact segment (10), its principle is to promote little pin (9) to move backward when inflation, inflation finishes and is close to valve cock before by pressure inside little pin (9) tightly being pushed to and reaches airtight, but owing to machining error and other reason, is difficult to reach the desirable seal effect.Serious is that part (10) easily produces plastic deformation after temperature reduces, and the contraction of catching a cold of while two conical surfaces makes both produce the gap, thus internal gas with the pressure that is higher than several times of extraneous gass to external leakage.

The purpose of this utility model is the problem of leaking gas by valve cock for the gas that solves bicycle inner tube.

The utility model is compared with existing product has following obvious advantage, and good sealing effect all can keep fabulous seal in ± 40 ℃ of scopes, simple in structure, easy processing, and adding cost is low, does not change existing valve cock structure, and existing tooling device need not to transform.Esy to use, safe and reliable, the life-span is long.The vehicle of the identical valve cock structure of employing such as wheelbarrow, motorcycle all can adopt the utility model to solve plunger gas leakage problem.When Motor Vehicle adopts Chinese patent CN-85202789 " inner tube of tyre for motor-vehicle valve cock annex ", also can adopt the utility model, reach the problem that prevents that gas from leaking from valve cock.

Fig. 1 is the structural drawing of existing improved plunger.

Fig. 2 is a structural drawing of the present utility model.

Embodiment of the present utility model is as follows: the utility model adopts following two kinds of measures to solve valve cock gas leakage problem.The first is dosed low temperature resistant, a medium-hard rubber gasket (2) in air tube cap (1) lining of Fig. 2, after the air tube cap is tightened on the air tube (3), the air tube endoporus is shut, thereby solved gas by the outside seepage of air tube endoporus.It two is to add a pressure compensation spring (4) between valve ferrule (5) and air tube (3), make under any temperature, no matter valve inside rubber (7) shrinkage is to which kind of degree, under spring force forces pushing, rubber is close on the conical surface, keep good sealing effect and avoid gas leakage, also solved the loosening problem of valve ferrule simultaneously.The utility model has only increased a spring and a rubber pad, need not change the valve cock general structure that has bicycle now.The spring of Fig. 2 (4) adopts 65Mn, and steel wire diameter is 1.0mm, and pitch is the cylindrical spring of 2.5mm, and the natural length of spring is 6.5mm, and the spring that meets above parameter is used for bicycle.The material of rubber pad (2) is HG4-400-66,1250.External diameter car at plunger (3) during installation removes 2mm, in case spring (4) is obstructed in compression process.

Claims (2)

1, safe plunger belongs to the auxiliary device of inner tube of vehicles inflation usefulness, it is made up of air tube cap [1], plunger [3], valve ferrule [5], valve cock [6], valve inside [7], it is characterized in that having added a rubber pad [2], between plunger [3] and valve ferrule [5], added spring [4] in air tube cap [1] lining.

2, safe plunger as claimed in claim 1 is characterized in that spring (4) is a helical spring.