CN108386643A

CN108386643A - Sleeve expansion joint

Info

Publication number: CN108386643A
Application number: CN201810459090.9A
Authority: CN
Inventors: 高玉琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-05-15
Filing date: 2018-05-15
Publication date: 2018-08-10

Abstract

A kind of sleeve expansion joint comprising outer barrel（1）, inner cylinder（2）, outer barrel is variable-diameter structure, and left section of inner cylinder is located in the enlarged diameter section of outer barrel, and ring-shaped rubber pipe is equipped between outer barrel and inner cylinder（4）, baffle ring is equipped on the left of ring-shaped rubber pipe（3）, gland is equipped on the right side of ring-shaped rubber pipe（8）, the flange of gland and the flange of outer barrel（7）Connection, the air nozzle of ring-shaped rubber pipe（6）Sealing is pierced by and conduit from the enlarged diameter section barrel of outer barrel（5）Right end be tightly connected, the sealing of the left end of conduit is put in the reduced diameter section of outer barrel.Its main feature is that, ring-shaped rubber pipe is equipped between outer barrel and inner cylinder, ring-shaped rubber pipe is connected by the small diameter portion of conduit and outer barrel, fluid in outer barrel enters ring-shaped rubber pipe through conduit, the pressure of fluid makes ring-shaped rubber tube swelling, it realizes and is sealed between inner cylinder and outer barrel, as long as ring-shaped rubber pipe is not worn, sealing performance would not decline.

Description

Sleeve expansion joint

Technical field

The present invention relates to a kind of sleeve expansion joints, are used to compensate expanding with heat and contract with cold for pressure piping.

Background technology

The structure of sleeve expansion joint generally comprises outer barrel, inner cylinder, and one end of inner cylinder is stretched outside in outer barrel, outer barrel and inner cylinder it Between be equipped with airtight and watertight padding, the both sides of airtight and watertight padding, which are clamped, makes airtight and watertight padding generation be radially expanded, and airtight and watertight padding is with respect to outer barrel Position immobilizes, and the position between inner cylinder and outer barrel can axially move, and generates and rubs between airtight and watertight padding when inner cylinder moves It wipes, so that airtight and watertight padding is worn, sealing performance is caused to decline；In addition pinch seal filler needs to apply enough pretightning forces so that Frictional force is in maximum state of value between airtight and watertight padding and outer barrel and inner cylinder, and the movement between outer barrel and inner cylinder is dumb, and Airtight and watertight padding is easy to wear.

Invention content

The technical problem to be solved in the present invention is to provide a kind of sleeve expansion joint, which can be reliable Compensation sealing performance.

The technical scheme is that a kind of sleeve expansion joint comprising outer barrel 1, inner cylinder 2, outer barrel is variable-diameter structure, interior Left section of cylinder is located in the enlarged diameter section of outer barrel, characterized in that ring-shaped rubber pipe 4 is equipped between outer barrel and inner cylinder, in annular Baffle ring 3 is equipped on the left of rubber tube, baffle ring is fixedly connected on the inner wall of outer barrel, and the inner circle of baffle ring is matched with the outer circle of inner cylinder, Be equipped with gland 8 on the right side of ring-shaped rubber pipe, the outer wall of gland matches with the inner wall of outer barrel, the inner circle of gland and inner cylinder it is outer Circle matches, and the flange of gland and the flange 7 of outer barrel connect, and the air nozzle 6 of ring-shaped rubber pipe is from the enlarged diameter section barrel of outer barrel Sealing is pierced by be tightly connected with the right end of conduit 5, and the left end sealing of conduit 5 is put in the reduced diameter section of outer barrel.

It is a feature of the present invention that being equipped with ring-shaped rubber pipe between outer barrel and inner cylinder, ring-shaped rubber pipe is by conduit and outside The small diameter portion of cylinder connects, and the fluid in outer barrel enters ring-shaped rubber pipe through conduit, and the pressure of fluid keeps ring-shaped rubber pipe swollen It is swollen, it realizes and is sealed between inner cylinder and outer barrel, the pressure of fluid is bigger, and ring-shaped rubber pipe and the contact of outer barrel and inner cylinder are closer. When inner cylinder moves in outer barrel, ring-shaped rubber pipe has abrasion, as long as ring-shaped rubber pipe is not worn, sealing performance would not Decline.

Description of the drawings

Fig. 1 is the structural diagram of the present invention.

Attached drawing mark indicates respectively：1- outer barrels, 2- inner cylinders, 3- baffle rings, 4- ring-shaped rubbers pipe, 5- conduits, 6- air nozzles, 7- methods Orchid, 8- glands, 9- pipe fittings, 10- sealing rings, 11- bolts.

Specific implementation mode

In conjunction with the specific implementation mode of the description of the drawings present invention.

A kind of sleeve expansion joint comprising outer barrel 1, inner cylinder 2, outer barrel are variable-diameter structure, and left section of inner cylinder is located at outer barrel In enlarged diameter section, characterized in that be equipped with ring-shaped rubber pipe 4 between outer barrel and inner cylinder, baffle ring is equipped on the left of ring-shaped rubber pipe 3, baffle ring is fixedly connected on the inner wall of outer barrel, and the inner circle of baffle ring is matched with the outer circle of inner cylinder, on the right side of ring-shaped rubber pipe Equipped with gland 8, the outer wall of gland is matched with the inner wall of outer barrel, and the inner circle of gland is matched with the outer circle of inner cylinder, the method for gland Orchid is connect by bolt 11 with the flange 7 of outer barrel, and the air nozzle 6 of ring-shaped rubber pipe is sealed from the enlarged diameter section barrel of outer barrel to be pierced by It is tightly connected by the right end of pipe fitting 9 and conduit 5, the left end sealing of conduit 5 is put in the reduced diameter section of outer barrel.

Gland and baffle ring do not apply pretightning force to ring-shaped rubber pipe axial limiting, to ring-shaped rubber pipe, such outer barrel with it is interior Relative movement between cylinder is flexible.Ring-shaped rubber pipe is made of silicon rubber or ethylene propylene diene rubber.

Inner barrel and outer barrel distinguishes seal for pipe joints connection adjacent thereto when use, arrow in the flow direction of fluid such as Fig. 1 in pipeline Shown in head from left to right, fluid enters ring-shaped rubber pipe by conduit, and there is fluid certain pressure energy to keep ring-shaped rubber pipe swollen Swollen, ring-shaped rubber pipe is in close contact with outer barrel and inner cylinder and realizes sealing, and contact of the bigger sealing shroud of pressure with outer tube is tighter It is close.The gap that fluid also can be between baffle ring and inner cylinder in pipeline flows to ring-shaped rubber pipe, but on the left of baffle ring outer barrel diameter compared with Greatly, the pressure of this section of fluid is relatively low, this section of fluid is using the gap between baffle ring and inner cylinder（Cooperation between baffle ring and inner cylinder Make the gap very little）Throttling, the pressure of this section of fluid is less than the pressure in ring-shaped rubber pipe, makes the fluid in sleeve expansion joint It is difficult to leak along ring-shaped rubber pipe periphery.

For make sleeve expansion joint in the duct fluid flow direction change when make also keep sealing performance, sleeve expansion joint can Such structure is taken, i.e. the interior circular diameter of outer barrel reduced diameter section is equal with the interior circular diameter of inner cylinder, in such ring-shaped rubber pipe Pressure of the pressure still above fluid on the left of baffle ring；It is equipped with groove in the inner circle of baffle ring, sealing ring 10 is set in the groove, seals Circle can further decrease the gap between baffle ring and inner cylinder, carry out reducing pressure by regulating flow to fluid on the left of baffle ring, fluid is made to be difficult to along ring Shape rubber tube periphery leaks.

Compared with prior art, this sleeve expansion joint is to sealing element（Ring-shaped rubber pipe）Do not apply pretightning force, inner cylinder rotation When sealing element pressure correlation of the frictional force only with fluid in sleeve expansion joint, the friction of sealing element when the pressure of fluid is smaller Power also reduces accordingly, greatly reduces the abrasion of sealing element, improves service life, while the abrasion of sealing element can mend automatically It repays, maintains the sealing performance of sleeve expansion joint.

Claims

1. a kind of sleeve expansion joint comprising outer barrel（1）, inner cylinder（2）, outer barrel is variable-diameter structure, and left section of inner cylinder is located at outer barrel Enlarged diameter section in, characterized in that between outer barrel and inner cylinder be equipped with ring-shaped rubber pipe（4）, it is equipped on the left of ring-shaped rubber pipe Baffle ring（3）, baffle ring is fixedly connected on the inner wall of outer barrel, and the inner circle of baffle ring is matched with the outer circle of inner cylinder, in ring-shaped rubber pipe Right side be equipped with gland（8）, the outer wall of gland matches with the inner wall of outer barrel, and the inner circle of gland is matched with the outer circle of inner cylinder, The flange of gland and the flange of outer barrel（7）Connection, the air nozzle of ring-shaped rubber pipe（6）It seals and wears from the enlarged diameter section barrel of outer barrel Go out and conduit（5）Right end be tightly connected, the sealing of the left end of conduit is put in the reduced diameter section of outer barrel.

2. sleeve expansion joint according to claim 1, characterized in that the interior circular diameter of outer barrel reduced diameter section and inner cylinder it is interior Circular diameter is equal, and groove is equipped in the inner circle of baffle ring, sealing ring is set in the groove（10）.