CN201322150Y

CN201322150Y - A cap nut

Info

Publication number: CN201322150Y
Application number: CNU2008201935410U
Authority: CN
Inventors: 刘选民; 郭文惠; 翟海涛
Original assignee: General Designing Institute of Hubei Space Technology Academy
Current assignee: General Designing Institute of Hubei Space Technology Academy
Priority date: 2008-12-06
Filing date: 2008-12-06
Publication date: 2009-10-07
Anticipated expiration: 2018-12-06

Abstract

The utility model discloses a cap nut, relates to the connection technology field of air pressure pipeline and comprises a cap nut body which is composed of a casing, screw thread on the inner surface of the casing and a threaded tool-withdrawal groove positioned inside the casing, wherein leak detection holes are positioned near the root portion of the screw thread in the threaded tool-withdrawal groove, and the leak detection holes whose number is from one to three are distributed along the threaded tool-withdrawal groove. By utilizing the cap nut, the problems that a common cap nut is vulnerable to be polluted and the air-tight performance thereof is difficult to check are effectively resolved, and the gas-tight checking efficiency is enhanced.

Description

A kind of cap nut

Technical field

The utility model relates to pipeline interconnection technique field, is particularly related to the cap nut that uses when being used for the pneumatic circuit connection.

Background technique

The tradition pneumatic circuit connects the forms that adopt nipple joint mouth+spherical joint+cap nut more, cap nut is tightened on the inipple, cap nut compresses spherical joint simultaneously, and spherical joint sealing surface and nipple joint mouth sealing surface are compressed mutually, realizes airtight.Pneumatic circuit is generally understood the butt joint position and is carried out airtight inspection after connecting.Whether traditional test mode has bubble to produce for being coated with soap solution around cap nut, observing.Need soap solution is all smeared in all slits of cap nut this moment, and not only workload is big, and exist and observe difficulty, pollute part, problem that the cleaning amount is big easily.

The model utility content

The purpose of this utility model is to provide a kind of cap nut, has solved the airtight inspection difficulty of common cap nut, and easily pollution problems has improved the efficient of airtight inspection.

A kind of cap nut, comprise the cap nut body, the cap nut body is made of the screw thread of housing, shell inner surface and the Gewindefreistiche that is located in the housing, position near thread root in Gewindefreistiche has leak hunting aperture, the quantity of leak hunting aperture is one to three, circumferentially distributes along Gewindefreistiche.

Described leak hunting aperture is two, and circumferentially evenly distributes along Gewindefreistiche.

Technique effect of the present utility model is embodied in: the utility model is processed leak hunting aperture at cap nut, the area of passage of leak hunting aperture is much larger than the slit between cap nut and bulb, nipple joint mouth, therefore when flow leakage, at first can check out at the leak hunting aperture place, when airtight inspection, only needing to smear soap solution at the leak hunting aperture place just can realize checking that checking efficiency improves more than 80%.

Description of drawings

Fig. 1 is for adopting the utility model structural representation.

Fig. 2 is the enforcement view of the utility model under concrete assembly condition.

Embodiment

Below in conjunction with accompanying drawing and example the utility model is described in further detail.

As shown in Figure 1, the utility model comprises cap nut body 1 and leak hunting aperture 2.The cap nut body constitutes 12 by the screw thread 11 of housing, shell inner surface and the Gewindefreistiche that is located in the housing.Leak hunting aperture is positioned at the position of Gewindefreistiche 12 near screw thread 11 roots, and the quantity of leak hunting aperture 2 is generally one to three, preferred two, circumferentially distributes along Gewindefreistiche 12.

Fig. 2 is the enforcement view of the utility model under concrete assembly condition, comprises cap nut 4, bulb 5 and nipple joint mouth 3.

Cap nut 4 is socketed in outside the bulb 5, and is tightened on the nipple joint mouth 3, and the conical surface of nipple joint mouth 3 contacts with 5 of bulbs and forms potted line, realizes airtight.Characteristics according to gas, air-flow always flows to the lower direction of pressure, and when the path of many places, air-flow can be selected to flow out than MP major path, owing to have leak hunting aperture on the cap nut 4, therefore its area of passage when flow leakage, at first can be checked out much larger than the slit of 3 in cap nut and bulb 5, nipple joint mouth at the leak hunting aperture place.When employing is coated with the soap solution inspection, can only smears two place's leak hunting apertures and check.

The utility model key is that leak hunting aperture should be through hole at cap nut processing leak hunting aperture, orifice diameter should

Between, the position in hole should be at the Gewindefreistiche position of cap nut.The utility model can be widely used in pneumatic circuits such as gaspipe line, gas pipeline and connect.

Claims

1, a kind of cap nut, comprise the cap nut body, the cap nut body is made of the screw thread of housing, shell inner surface and the Gewindefreistiche that is located in the housing, it is characterized in that, position near thread root in Gewindefreistiche has leak hunting aperture, the quantity of leak hunting aperture is one to three, circumferentially distributes along Gewindefreistiche.

2, a kind of cap nut as claimed in claim 1 is characterized in that, described leak hunting aperture is two, circumferentially evenly distributes along Gewindefreistiche.