CN2345824Y - Strong pipe fitting for pipe without mantle fiber - Google Patents

Abstract

The utility model discloses a strong pipe fitting for pipe without die head threading. An outer shell of a metal cylindrical pipe fitting of an arc-shaped boss in which one end is big; one end is small; a car at an inner wall of the big end is provided with screw threads; the inner wall of the small end forms a taper; the transition of the taper and the screw thread is 90 DEG is used; the inner wall forms a taper, and an outer wall is provided with screw threads and a hollow locking screw rod matched with the outer shell of the pipe fitting; the connection between the pipe and the pipe is realized through two connecting pipes. The utility model has the advantages of simple structure, simple and quick construction and operation, reliable seal, strong use pressure, high anti-pull force and beautiful appearance and is suitable for various connections of three-way bent heads, four-way bent heads or a core complementing plug, etc.

Description

Exempt to overlap the powerful pipe fitting of fiber tube

The utility model relates to the pipeline connection technology field, particularly a kind ofly exempts to overlap the powerful pipe fitting of fiber tube.

Pipeline uses screwed connection, has continued to use last a century.Its essential characteristic is a silk outside being connected the end cover system of tubing, and the equal car in the termination of various links has internal thread.During connection pipe fitting and pipe fitting are tightened mutually, and outside tube head, twined paste paint flax silk or raw meal belt on the silk,, reach the purpose of sealing to clog the space between inside and outside silk.There is certain defective in this method: after 1, being connected the end mantle fiber of tubing, destroyed resin layer, be easy to corrosion, not only influenced attractive in appearancely, and influenced working life; 2, the tubing of this pipeline overwhelming majority is black pipe or galvanized pipe, as is used to carry domestic water, easily makes water quality produce secondary pollution; 3, the mode of screwed connection is wasted metallic material.The application of Stainless Steel Tube and Al-alloy pipe, health, attractive in appearance more, but these tubing are all expensive, can not adopt the huge screwed connection of waste.Be seen in the aluminum alloy pipe fitting of use in recent years, changed the traditional approach of screwed connection, mainly be to compress side seal with the conical surface, but its working pressure is lower, it is flexible to be difficult to resist temperature, because of its each tie point all may produce flexible slippage, reduce sealing effect, thereby influenced using scope.Chinese patent " 2280824 " provides a kind of thin walled tube link structure, be at joint internal thread rearward end car system one flat end face, the thin walled tube end diffusion that is connect becomes flange mouth, between planar end surface and flange mouth seal washer is housed, the outside thread nut that screws in the joint is fastened on the thin walled tube end in the joint.It also comes with some shortcomings: at first, being connected pipe end needs to become flange mouth by special purpose machine tool equipment diffusion, and this flange mouth and tube wall are square 90 °, and this damages the mouth of pipe easily, influences seal degree and withdrawal resistance.The present job site overwhelming majority does not possess the condition of using special purpose machine tool equipment simultaneously.Secondly, the method for its connection is the outside thread nut to be screwed into the joint internal thread contact with seal washer until flange mouth, thisly directly is pressed in method on the flange mouth with nut, meets vibration or other external force, may become flexible, and influence seals.In addition, no matter this outside thread nut is circle or hexagonal shaped, all can not be screwed onto the end face of being close to joint, and this extremely influences attractive in appearance.

The purpose of this utility model provides a kind of quick for installation, and sealing is reliable, the working pressure height, and withdrawal resistance is strong, beautiful shape, the part kind is few exempts to overlap the powerful pipe fitting of fiber tube.

The technological scheme that realizes the utility model purpose is: a kind ofly exempt to overlap the powerful pipe fitting of fiber tube, comprise a pipe fitting shell, be that an end is big, the metallic cylinder that one end is little, big end inwall car has screw thread, the small end inwall is a tapering, and it is excessive to hold outer wall and small end outer wall to be constant slope greatly, and gradient excessively section inwall is 90 ° of arc boss; An inwall is a tapering, and the outer wall car has screw thread, small end end face symmetry have two grooves and with the circular hollow locking screw of pipe fitting outer casing inner wall screw-thread fit; There are 90 ° of arc crimpings two terminations that are certain taper and band tapering, and the connected tube that cooperates with pipe fitting shell, circular hollow locking screw respectively; Two velamen connecting tubes have between 90 ° of arc crimpings seal washer, between the 90 degree arc crimpings of big termination of circular hollow locking screw and connected tube termination spring washer is arranged.

The utlity model has following advantage: 1, working pressure height, withdrawal resistance is strong; 2, the arc mouth of pipe is difficult for impairedly, and the crimping and the conical surface have strengthened the reliability of resistance to plucking; 3, outward appearance is mellow and full level and smooth, elegant in appearance; 4, the pipe fitting kind is simple, and constructing operation is easy.

Fig. 1 is the utility model structural representation

Fig. 2 is the plan view of circular hollow locking screw in the utility model

Fig. 3 is the side view of Fig. 2

Below in conjunction with accompanying drawing the utility model is described in further detail:

Pipe fitting shell 1 is processed into cylindric that an end is big, an end is little, the threading of big end inwall, the small end inwall is a tapering, to hold inwall to be processed into 90 ° of arc boss 8 greatly with the small end changeover portion, after pipe fitting shell 1 processes, with connected tube 5 by the small end of pipe fitting shell 1 to big end break-through, the connected tube 5 that penetrates clamps outside the big end of pipe fitting shell 1, with the blunderbuss head connected tube 5 is expanded and to become to have a tapering and termination to be 90 ° of arc crimpings 6, at this moment the little extreme direction of connected tube 5 to pipe fitting shell 1 drawn, move to till crimping 6 and boss 8 contacting points, put into packing ring 3.Clamp then connected tube 5 ' with connected tube 5 ' expand become to have a tapering and termination be 90 ° of arc crimpings 6 ', with connected tube 5 ' penetrate to little extreme direction, wear till run into packing ring 3 from the big end of arm spare shell 1.Then spring washer 4 is screwed in circular hollow locking screw 2, till compressing.

The utility model also can be used for threeway, four-way, elbow or mends core plug etc.

The pipe-line system that adopts the utility model to produce, test pressure reaches 2.8MPa, press national regulation and stipulates that working pressure can reach 1.9MPa, is three times of the general civil building feedwater piping working pressure 8.6MPa of regulation and stipulation.According to test result, can reach 1.2Km/cm along the withdrawal resistance of tubing excircle, can effectively resist the impact of water hammer.

Claims (2)

1, a kind ofly exempt to overlap the powerful pipe fitting of fiber tube, it is characterized in that comprising:

A, a pipe fitting shell (1) are that an end is big, and the metallic cylinder that an end is little holds the inwall car that screw thread is arranged greatly, and the small end inwall is a tapering, hold outer wall and small end outer wall to be the constant slope transition greatly, and gradient changeover portion inwall is 90 ° of arc boss (8);

B, an inwall are a tapering, and the outer wall car has screw thread, the circular hollow locking screw (2) that small end end face symmetry has two grooves (7) and cooperates with pipe fitting shell (1) inner thread,

There are 90 ° of arc crimpings (6), (6 ') in c, two terminations that are certain taper and band tapering, and the connected tube (5), (5 ') that cooperate with pipe fitting shell (1), circular hollow locking screw (2) respectively.

2, pipe fitting according to claim 1, it is characterized in that two velamen connecting tubes (5), (5 ') have seal washer (3) is arranged between 90 ° of arc crimpings (6), (6 '), the big termination of circular hollow locking screw (2) is spent between the arc crimpings (6 ') with 90 of connected tube (5 ') termination spring washer (4).

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