CN202992511U

CN202992511U - Sealing plug

Info

Publication number: CN202992511U
Application number: CN2012202872631U
Authority: CN
Inventors: 刘锋; 苏翠娥; 孙迎霞
Original assignee: Shanghai Institute of Space Propulsion
Current assignee: Shanghai Institute of Space Propulsion
Priority date: 2012-06-18
Filing date: 2012-06-18
Publication date: 2013-06-12
Anticipated expiration: 2022-06-18

Abstract

The utility model relates to a sealing plug. The utility model aims to settle a sealing plug which can realize metal and non-metal dual sealing. The sealing plug is simultaneously suitable for high-pressure system and low-pressure system, and satisfies sealing of M12 small-dimension interface pipe nozzle. The sealing plug is characterized in that: the plug is mainly composed of an outer nut, a stopper and a sealing shaft; the lower spherical head of the stopper is a spherical surface which is matched with a trumpet-mouth-shaped sealing surface of a sealed opening, thereby forming a sealing structure which contacts with the hard seal of the sealed opening; the sealing shaft is provided with a sealing structure which is formed by an O-shaped sealing ring and contacts with the soft seal of the sealed opening at a position that extends into the channel of the sealed opening. According to the sealing plug, a mode of combining the hard seal and the soft seal is adopted, thereby effectively improving sealing reliability under high pressure. Furthermore the structure form is suitable for sealing flow channels with different diameters, which includes sealing M12 small-dimension interface with a screw thread structure.

Description

A kind of seal plug

Technical field

The utility model relates to sealed product, relates in particular to seal plug.

Background technique

At present, known seal plug can be divided into three kinds of ball face sealings, gasket seal, plunger type seal with O ring substantially.

The ball face sealing plug mostly is 60 ° of bulb seal form, as shown in Figure 1, by cotter pin 1,60 ° of bulbs stop up 2, cap nut 3 and sealed ozzles 4 form that (wherein cotter pin 1 can replace with back-up ring, or cancellation cotter pin 1, directly bulb is stopped up 2 ends and draws together mouth, prevent bulb stop up 2 come off in the cap nut 3 get final product).This Connecting format has the advantages such as simple in structure, easy to assembly, at home and abroad delivers on model to be widely used, but due to its resistance to shock and the shortcoming such as the secondary assembly performance is poor, abroad eliminates from the delivery model gradually at present.Similar structure also has 37 °, 42 °, 74 ° sealing bulbs.In recent years domestic more to 24 ° of sealing configuration researchs, be promoted on the space flight model gradually.Separately have on the sphere of sealing bulb and design seal groove, increase nonmetal sealing together, but this structure is strict to the precision control of product, if mismate can only be realized one sealing, therefore is not used widely.

The gasket seal plug adopts pad (metal or nonmetallic material) to carry out end face seal, is single track sealing structure, generally is used for low service system, and high-pressure system is recommendation not.

The physical dimension of plunger type seal with O ring plug is larger, is not suitable for the following small size interface of M20.

The model utility content

Technical problem to be solved in the utility model is to provide a kind of seal plug, can realize metal and nonmetal double seal, is applicable to simultaneously the high and low pressure system, and satisfies the sealing of M12 small size interface ozzle.

For solving the problems of the technologies described above, technical solution of the present utility model is:

A kind of seal plug; It is characterized in that: described plug mainly is comprised of cap nut, stopper, seal shaft; Described cap nut is set in sealed mouthful of outside the realization and is threaded, and described spigot end is installed the location anti-drop device after passing cap nut; The stopper lower end surface is bulb, and described bulb end offers tapped hole and is used for connecting seal shaft, and seal shaft be movable part in bulb, certain limit can realize with sealed pipeline axially, radially neutrality compensates; The sphere that the lower end bulb of described stopper matches for the toroidal sealing surface with sealed mouth forms the sealing configuration that contacts with sealed mouthful of hard sealing; Be provided with the sealing configuration that contacts with sealed mouthful of soft seal that is formed by " O " shape seal ring on described seal shaft on the position of the channel interior that stretches into sealed mouth.

Preference 1, the sealing configuration that contacts with sealed mouthful of soft seal on described seal shaft is following structure: the bipassage ring connected in star is arranged on seal shaft, two " O " shape seal rings are housed respectively; Described two " O " shape seal rings produce resiliently deformable, form two seal structures that contact with sealed mouthful of soft seal.

Preference 2, the sealing configuration with sealed mouthful of soft seal contact on described seal shaft is following structure: annular groove together with having on seal shaft is provided with " O " shape seal ring, fluoroplastic back-up ring successively along the gas motion direction in annular groove; Described " O " shape seal ring forms for generation of resiliently deformable the sealing configuration that contacts with sealed mouthful of soft seal; The gap phenomenon does not occur to squeeze for the protection of " O " shape seal ring bearing in described fluoroplastic back-up ring under high-pressure.

The utility model can bring following beneficial effect:

The form that the utility model adopts hard sealing and soft seal to combine, realize double seal by the sealing of " O " shape seal ring with the sphere horn mouth for sealed mouthful, effectively improved the sealing reliability under the high pressure, and this structural type can also be applicable to the runner sealing of different latus rectums, comprises the small size sealing joint of worm structure M12.

Description of drawings

Fig. 1: conventional 60 ° of bulb seal plug structural representations

Fig. 2: the structural representation of a preferred embodiment of the utility model

Fig. 3: the present embodiment and structure sectional view after sealed mouth docks

Fig. 4: another embodiment's of the present utility model structural representation

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail.

As shown in Figure 2 and Figure 3, in Fig. 2, Fig. 3,5 are cotter pin, and 6 is stopper, and 7 is cap nut, and 8 is seal shaft, and 9 is " O " shape seal ring, and 10 is sealed mouthful.

Stopper 6 is installed at cap nut 7 centers, and stopper 6 is connected with cap nut 7 by cotter pin 5, and the location anti-drop device here adopts cotter pin 5 to prevent that stopper 6 from coming off from cap nut 7; Also can adopt back-up ring, or cancel cotter pin 5 and adopt the mode that draw together mouthful stopper 6 ends to be used for realizing preventing the effect that stopper 6 comes off from cap nut 7; Cap nut 7 is connected with sealed mouth 10 in Fig. 3 by screw thread, and sealed mouthful of sealing surface is 60 ° of horn mouth forms, and stopper 6 is 60 ° of spheres, firmly seals with the horn mouth sealing surface to contact, and plays seal action one.Stopper 6 centers are equipped with a seal shaft 8, seal shaft 8 and stopper 6 are threaded connection, have the bipassage ring connected in star on seal shaft 8, twice O-ring seals 9 is housed in groove, " O " seal ring 9 on seal shaft 8 contacts with the passage of sealed mouth 10, and " O " circle produces certain decrement and realizes the nonmetal sealing of twice.

In the present embodiment, " O " seal ring 9 is twice, can change according to the diameter of sealed mouthful of passage the diameter of seal shaft, select suitable " O " seal ring and cap nut to seal, in the present embodiment, the seal shaft external diameter is selected Φ 4mm, and " O " seal ring is Q/Fc0305-2002X2.2 * 1F-YB-270A, cap nut selection standard spare YC1232-89 cap nut 4 (M12 * 1.25).

From the above mentioned, the utility model is owing to taking above technological scheme, seal with the sphere horn mouth by the sealing of twice " O " shape seal ring for sealed mouthful 10, effectively improved the system sealing reliability, this structural type goes for the runner sealing of different latus rectums under 0 ~ 23MPa system pressure.Sealing configuration can as required with 2 roads " O " shape seal ring, change fluoroplastic back-up ring, " O " shape ring structure into, as shown in Figure 4.In Fig. 4,11 is back-up ring, and 12 is stopper, and 13 is cap nut, and 14 is seal shaft, and 15 is back-up ring, and 16 is one " O " seal ring.

After increasing the fluoroplastic back-up ring, protection " O " shape seal ring does not occur under high-pressure to squeeze the gap phenomenon bearing, and can realize reliable sealing in 0～40MPa scope.

Change 60 ° of bulbs into 24 ° of bulbs, also can realize reliable sealing.

Claims

1. seal plug; It is characterized in that: described plug mainly is comprised of cap nut, stopper, seal shaft; Described cap nut is set in sealed mouthful of outside the realization and is threaded, and described spigot end is installed the location anti-drop device after passing cap nut; The stopper lower end surface is bulb, and described bulb end offers tapped hole and is used for connecting seal shaft, and seal shaft be movable part in bulb, certain limit can realize with sealed pipeline axially, radially neutrality compensates; The sphere that the lower end bulb of described stopper matches for the toroidal sealing surface with sealed mouth forms the sealing configuration that contacts with sealed mouthful of hard sealing; Be provided with the sealing configuration that contacts with sealed mouthful of soft seal that is formed by " O " shape seal ring on described seal shaft on the position of the channel interior that stretches into sealed mouth.

2. according to a kind of seal plug claimed in claim 1; It is characterized in that: the sealing configuration that contacts with sealed mouthful of soft seal on described seal shaft is following structure: the bipassage ring connected in star is arranged on seal shaft, two " O " shape seal rings are housed respectively; Described two " O " shape seal rings produce resiliently deformable, form two seal structures that contact with sealed mouthful of soft seal.

3. according to a kind of seal plug claimed in claim 1; It is characterized in that: the sealing configuration with sealed mouthful of soft seal contact on described seal shaft is following structure: annular groove together with having on seal shaft is provided with " O " shape seal ring, fluoroplastic back-up ring successively along the gas motion direction in annular groove; Described " O " shape seal ring forms for generation of resiliently deformable the sealing configuration that contacts with sealed mouthful of soft seal; The gap phenomenon does not occur to squeeze for the protection of " O " shape seal ring bearing in described fluoroplastic back-up ring under high-pressure.