CN2421494Y - Pipe joint - Google Patents

Abstract

The utility model relates to a pipe joint. The pipe joint is mainly characterized in that the pipe joint comprises a body. An aluminum-plastic composite pipe and a supporting pipe are arranged in the body. A screw cap is arranged outside the body, A clamping ring is arranged between the screw cap and the body. A clamping opening is arranged on the contact surface of the clamping ring and the aluminum-plastic composite pipe. A main sealing ring is arranged between the clamping ring and the body. The section shape of an outer ring of the clamping ring is an inclined surface. The section shape of the part on a main body which is matched with the inclined surface of the clamping ring is an inclined surface. Due to the fact that the structure is adopted by the pipe joint, the walking position of each component is more reasonable, the compression rate of the main sealing ring is higher, and thereby, leakage is effectively prevented.

Description

A kind of pipe joint

The utility model relates to a kind of pipe joint.

In people's daily production and life, various pipelines are necessary tool of transport of water, gas.Mostly pipeline in the past is metallic conduit, exists many shortcomings.Industry has emerged the upsurge that changes the conventional pipelines material both at home and abroad in recent years, present stage mature technique be to replace metallic conduit with aluminium-plastic composite pipe, aluminium-plastic composite pipe is compared with traditional metallic conduit and had the following advantages: nontoxic, corrosion-resistant, light weight, mechanical strength height, resistance to heat is good, brittle temperature is low, long service life, tube fluid resistance are low, less scaling.When aluminium-plastic composite pipe is installed, no matter be that elbow, straight-through, threeway are installed, do not need tapping, connect and the sealing task but directly use the pipe joint of forming by body, snap ring, cage ring, seal ring just can finish.But in present stage, this type of pipe joint exists deficiency: sealing effect is undesirable, and its main cause is the deficiency that walks of each assembly in actual applications, and the compression degree deficiency to seal ring has just caused leakage.

The purpose of this utility model provides a kind of pipe joint of good sealing effect to remedy the deficiency of prior art.

The purpose of this utility model is achieved in that a kind of pipe joint, comprises body, and flexible pipe is arranged in body; External nut arranged at this, between nut and the body snap ring is arranged, the surface of contact of snap ring and flexible pipe is provided with bayonet socket; Be provided with the primary seal circle between snap ring and the body, it is characterized in that: the outer ring section shape of snap ring is the inclined-plane, and the section shape of the part that matches with the snap ring inclined-plane on the main body is the inclined-plane.

Described a kind of pipe joint is characterized in that: support tube is arranged in flexible pipe, be with secondary seal ring on the support tube.

Described a kind of pipe joint is characterized in that: described flexible pipe can be aluminium-plastic composite pipe or polyethylene pipe.

Because the utility model has adopted said structure, makes that walking of each parts is more reasonable, the compressibility of primary seal circle is higher, thereby has effectively prevented leakage.

Below by embodiment, and in conjunction with the accompanying drawings the utility model is further described:

Fig. 1 is the utility model embodiment's a structural representation:

Embodiment:

A kind of pipe joint comprises body 1, and aluminium-plastic composite pipe 2 and support tube 3 are arranged in body 1, is provided with secondary seal ring 4 between aluminium-plastic composite pipe 2 and support tube 3; Nut 5 is arranged outside body 1, between nut 5 and the body 1 snap ring 6 is arranged, snap ring 6 is provided with bayonet socket 7 with the surface of contact of aluminium-plastic composite pipe 2; Be provided with primary seal circle 8 between snap ring 6 and the body 1, the outer ring section shape of snap ring 6 is the inclined-plane, and the section shape of the part that matches with snap ring 6 inclined-planes on the main body 1 is the inclined-plane.

First with nut 5, snap ring 6, primary seal circle 8 is inserted in successively from the cut ends of aluminium-plastic composite pipe 2.And then the support tube 3 that will package secondary seal ring 4 pushes in the aluminium-plastic composite pipe 2.Then above-mentioned part is pushed in the body 1.The screw thread that matches with nut 5 is arranged on the main body 1.Rotary nut 5, in nut 5 rotation drive-in steps, snap ring 6 also advances synchronously and compresses primary seal circle 8 simultaneously, and after being advanced to a certain degree, the chamfered portion on the body 1 will act on the chamfered portion of snap ring 6, and snap ring 6 is inwardly shunk.Continue rotary nut 5, snap ring 6 just continues compression primary seal circle 8, and when being compressed to predetermined extent, the contractile force that snap ring 6 is subjected to makes the exocuticle of bayonet socket 7 incision aluminium-plastic composite pipes 2, thus the installation process of finishing.

Because the front end at aluminium-plastic composite pipe 2 has soft secondary seal ring 4, at this moment continues rotary nut 5 again, will make nut 5, snap ring 6, aluminium-plastic composite pipe 2 advances compression secondary seal ring 4 synchronously.In this process, also compressed primary seal circle 8 simultaneously, make the compressibility of primary seal circle 8 higher, thereby just reached best sealing effect.

What deserves to be mentioned is, the snap ring 6 of pipe joint in the past all is circular, its stressed chucking mode all is in snap ring 6 by nut 5 positive force, the effect that this often can not obtain in actual applications, often all be because the cover implantation site of snap ring 6 is unbalanced, or nut 5 is unbalanced to the power of snap ring 5 in drive-in step, has caused snap ring 6 also not put in place with regard to too early stressed incision aluminium-plastic composite pipe 2, has caused primary seal circle 8 compressibility deficiencies.Here it is, and sealing effect is bad, causes the basic reason of leakage.And the technology that the utility model provides makes snap ring 6 be subjected to the reaction force of body 1, and more crucial is to allow the inclined-plane of snap ring 6 and the inclined-plane of body 1 match, and just makes application of force size, force application location, the compressibility of primary seal circle 8 has all been obtained quantification.When needs change application of force size, force application location, during to the compressibility of primary seal circle 8, the length and the gradient that also can change the inclined-plane realize.This creationary embodiment of the utility model just.

Claims (3)

1, a kind of pipe joint comprises body, and flexible pipe is arranged in body; External nut arranged at this, between nut and the body snap ring is arranged, the surface of contact of snap ring and flexible pipe is provided with bayonet socket; Be provided with the primary seal circle between snap ring and the body, it is characterized in that: the outer ring section shape of snap ring is the inclined-plane, and the section shape of the part that matches with the snap ring inclined-plane on the main body is the inclined-plane.

2, a kind of pipe joint as claimed in claim 1 is characterized in that: support tube is arranged in flexible pipe, be with secondary seal ring on the support tube.

3, a kind of pipe joint as claimed in claim 1 or 2 is characterized in that: described flexible pipe can be aluminium-plastic composite pipe or polyethylene pipe.

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