CN2380749Y

CN2380749Y - Expansion sealing apparatus

Info

Publication number: CN2380749Y
Application number: CN 99221464
Authority: CN
Inventors: 张方杰; 杨德峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-05
Filing date: 1999-07-05
Publication date: 2000-05-31
Anticipated expiration: 2009-07-05

Abstract

The utility model relates to a sealing device, particularly an expansion sealing device for sealing a pipe mouth when the pressure of a thin-wall large caliber pipe is tested. The expansion sealing device is composed of a sealing body, sealing rings and pressing rings, wherein, the sealing body is provided with the inner and the outer expansion sealing rings which are respectively fixed on the sealing body by the inner and the outer pressing rings. When the utility model is used for testing, the inner and the outer expansion sealing rings are filled with high-pressure water or high-pressure air to expand the inner and the outer expansion sealing rings so as to press and seal the pipe wall of a testing pipe in two ways. The expansion sealing device has the advantages of favorable and safe sealing effect without damaging testing pipes, convenient and quick installation and disassembly, long service life, high efficiency of testing work, and low cost.

Description

The Expansion sealing device

The utility model relates to seal arrangement, when particularly being applied to test thin-walled heavy caliber pipe pressure, and a kind of Expansion sealing device of sealing orifice.

Thin-walled heavy caliber metal tube, application has a large capacity and a wide range, and the pressure that pipe is born has the higher quality requirement.Therefore, produce this pipe and will carry out a large amount of bulge tests.Current, in bulge test, the seal arrangement of usefulness is sealing head.Be on seal, press-fiting on the endoporus with trim ring has the rubber seal of V-type groove to seal.During test sealing head is put into the mouth of pipe, (can seal one, suppress with one.Also can suppress at dress sealing head two, two.) its interface connects the equipment of suppressing.With high-pressure water pump or high-pressure pump,, in the V-type groove of rubber seal, import high pressure water or the high pressure air of 8MPa-12MPa earlier by the through hole on the seal.Under the high pressure, the resistance that rubber seal overcomes trim ring radially expanding, tightly lean against and realize sealing on the tube wall.Then, start the equipment of suppressing, in pipe, suppress.After the peace as requested reaches certain pressure, finish test, stop to suppress all off-loads.Because trim ring is being pressed rubber seal, seal ring cannot recover the origin-location, still abuts against on the tube wall, is difficult to dismounting.To be directed at rubber seal and damage inefficiency with press machine or striking method dismounting.This sealing head is that the sealing effect that will obtain needs to strengthen expanding power by rubber seal radially expanding force sealing from inside to outside.The mouth of pipe bears and breaks easily after the big expanding power and pipe is scrapped, and causes bigger economic loss.

In view of the foregoing, the purpose of this utility model is a kind of good sealing effect of invention, easy disassembly, quick is safe and reliable, long service life, not damaging tested pipe, thin-walled heavy caliber pipe is suppressed the test seal arrangement.

Basic design of the present utility model is on seal, the inside and outside Expansion sealing circle of inner-cavity structure to be installed.With the Expansion sealing circle that materials such as rubber are manufactured, have the performance that can recover original form after the expansion off-load of pressurization back, constitute the new type sealing device that the thin-walled heavy caliber pipe to tested pressure carries out two-way pressure sealing.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the structural representation of interior Expansion sealing circle [2];

Fig. 3 is the structural representation of outer Expansion sealing circle [3].

Reference character:

[1] seal, [1-1] seal interface, [1-2] interface tube, [2] interior Expansion sealing circle, [2-1] interior Expansion sealing circle interface, [2-2] interior Expansion sealing circle inner chamber, [3] outer Expansion sealing circle, [3-1] outer Expansion sealing circle interface, [3-2] outer Expansion sealing circle inner chamber, [4] outer trim ring, [5] interior trim ring, [6] tested pipe.

Be described in detail the utility model structure in conjunction with the accompanying drawings.As shown in Figure 1, the utility model be in seal [1] go up to be installed Expansion sealing circle [2] and outside Expansion sealing circle [3].With interior trim ring [5] and outer trim ring [4], respectively inside and outside Expansion sealing circle [2] and [3] are fixed on the seal [1].Seal interface [1-1] is used for connecting the equipment of suppressing.Shown in Fig. 2,3, interior Expansion sealing circle [2] and outer Expansion sealing circle [3] are manufactured with rubber or resilient high strength plastics and rubber-plastics material, and there are inner chamber [2-2] and [3-2] in its heart portion, and communicates with interface [2-1], [3-1].Interior Expansion sealing circle interface [2-1] and outer Expansion sealing circle interface [3-1] are made of high pressure hose or high-pressure metal control, and tightly are fixed on the Expansion sealing circle.On the seal [1], the hole that connects interior Expansion sealing circle interface [2-1] and communicate with interface tube [1-2] is arranged, the trough that outer Expansion sealing circle interface [3-1] is installed is arranged.For the ease of the pipe of installing, dismounting is tested, the external diameter that is slightly larger than tested pipe that the internal diameter of outer Expansion sealing circle [3] can be done.The internal diameter that is slightly less than tested pipe that the external diameter of interior Expansion sealing circle [2] can be done.

When using the sealing device, suppress, inside and outside seal ring is expanded,, seal up the mouth of pipe closely the two-way pressurization of tested tube wall to inside and outside Expansion sealing circle inner chamber.Its sealing load reaches 8MPa～16MPa and does not leak, and sealing effect is good.Because the sealing load direction reverse pressure that tube wall is applied equates can not damage tube wall, application safety is reliable.When Expansion sealing circle inner chamber is suppressed, the seal ring Expansion sealing, seal ring resilience during off-load can not be pressed on the tested tube wall.Sealing 16MPa does not leak, and sealing effect is good.Because the sealing load direction reverse pressure that tube wall is applied equates can not damage tube wall, application safety is reliable.When Expansion sealing circle inner chamber is suppressed, the seal ring Expansion sealing, seal ring resilience during off-load can not be pressed on the tested tube wall.The easy installation and removal of sealing device is quick, long service life, and test job efficient height, expense is low.

Embodiment:

To Φ 800mm diameter, the metal tube of wall thickness 6mm carries out bulge test.Experimental pressure is 8MPa.Do the obstructed Expansion sealing device of a socket and seal up a mouth of pipe as plug; Do another set of complete Expansion sealing device and be installed in another mouth of pipe.Seal interface [1-1] connects with the equipment of suppressing.The big 5mm of tube outer diameter that the ratio that the internal diameter of its outer Expansion sealing circle [3] is done is tested, the external diameter of interior Expansion sealing circle [2] is than the little 5mm of tested ips.With trim ring [5] in threaded interior Expansion sealing circle [2] is fixed on the seal [1], its interface [2-2] patches in the through hole of seal.Outer Expansion sealing circle [3] is fixed on the seal [1] with screw by trim ring [4], and its interface [3-2] is installed in the trough of seal [1].High-pressure water pump is taken over interface [1-2] and interface [3-2].During test, at first with high-pressure water pump by interface tube [1-2] and interface [3-2] to the inner chamber [2-2] of inside and outside Expansion sealing circle [2] and [3] and [3-2] 8MPa～12MPa that pressurizes.Expand with the ecto-entad both direction, diametrically from inside to outside with tight the sealing up of the mouth of pipe in inside and outside Expansion sealing circle [2], [3].At this moment start test and suppress equipment and carry out bulge test, finish to test after suppressing 8MPa, stop to suppress by seal interface [1-1].All off-loads then, inside and outside Expansion sealing circle is by the elastic return original form.Whole sealing device is taken out from the mouth of pipe very easily, prepares secondary and uses.

Claims

1. Expansion sealing device, form by seal, seal ring, trim ring, it is characterized by in seal [1] go up to be installed Expansion sealing circle [2] and outside Expansion sealing circle [3], and respectively interior Expansion sealing circle [2] and outer Expansion sealing circle [3] are fixed on the seal [1] by interior trim ring [5] and outer trim ring [4].

2. Expansion sealing device according to claim 1, it is characterized by described in Expansion sealing circle [2] and outer Expansion sealing circle [3] manufacture with rubber or resilient high strength plastics and rubber-plastics material, its heart portion has inner chamber [2-2] and [3-2] also to communicate with interface [2-1] and [3-1] respectively.

3. Expansion sealing device according to claim 1 is characterized by described interior Expansion sealing circle interface [2-1] and outer Expansion sealing circle interface [3-1] and makes of high pressure hose or high-pressure metal control, and tightly is fixed on the Expansion sealing circle.