CN205424194U - Flange formula seal for pipe joints device - Google Patents

Abstract

The utility model discloses a flange formula seal for pipe joints device, the device include the seal carrier body, two sealing washers, two locking rings and two flange, the both sides of the seal carrier body are sealing washer, locking ring and flange in proper order, the both sides of the seal carrier body are equipped with the keyway, flange's a side end face be equipped with with the seal carrier body on the draw -in groove that corresponds of keyway, flange's interior anchor ring is close to locking ring one side and be the taper surface, it is balanced with the locking ring, the locking ring is equipped with the opening, and interior anchor ring is equipped with snap ring or latch, and the nearly sealing washer of its surface one side is the male cone (strobilus masculinus), the one side and the locking ring of sealing washer are connected, and the opposite side supports with the sealed facial features of the seal carrier body. This application designs with the flange complex through the seal carrier body, locking ring, provide a simple structure, simple to operate, with low costs, sealing performance good and firm in connection's flange formula seal for pipe joints device.

Description

A flange type pipeline sealing device

technical field

The utility model relates to a pipeline conveying system, in particular to a flange-type pipeline sealing device.

Background technique

In large gas or liquid pipeline systems, there is a problem with the service life of the seals of pipeline coupling devices.

In the fluid pipeline system, flanges are used to seal the clamp gasket. After a period of use, problems such as oxidation and aging will occur, resulting in system leakage and a series of other chain quality problems, and the time and cost required for maintenance are very high. high.

For the installation and construction of pipelines, flange connections are generally used, and on-site welding is required, followed by leak testing. If welding defects such as slag inclusions in the welds need to be reworked, there are high requirements for the skills of on-site installation workers, and there are reasons Fire is prohibited on site, and welding repair may not be possible. There are problems such as low installation efficiency and difficult disassembly; flange connections are widely used in petroleum, chemical, metallurgy and other fields. Or equipment, first fixed on a flange, then add flange pads between the two flanges, and finally use bolts to compress the two flanges so that the sealing ring is compressed axially and tightly combined with it A detachable joint, but in actual engineering, this flange connection is easy to leak, and most of the leakage is caused by gasket oxidation or aging failure. Once leakage occurs, remove the bolts, lift the equipment and replace the gasket and pressure Tests, etc. will delay a certain production cycle. Therefore, the flange seal has always needed a design structure that is convenient for maintenance when it is put into operation at the initial stage, and can complete maintenance in a short time when there is a problem in the later operation.

Since the flexible graphite sealing ring is usually used under high temperature and high pressure, in an oxidizing environment, it will start to oxidize at a high temperature exceeding 450°C; in a normal high-pressure environment, pressure fluctuations will basically not cause gaps along the boundary of flexible graphite Extrusion of large pieces; therefore, flexible graphite sealing rings can achieve long-term safe and reliable sealing in fluid piping systems with static sealing temperatures (below 200°C) and low pressure (below 1.6MPa).

Utility model content

In order to solve the problems of service life, sealing performance and installation efficiency of pipeline connections in the prior art, the present application provides a flange-type pipeline sealing device with good sealing effect, long service life, low cost, firmness and stable performance. The specific technical scheme is as follows.

The application provides a flanged pipeline connection device, which includes a sealing frame (1), two sealing rings (2), two locking rings (3) and two connecting flanges (4); The two sides of the sealing frame body (1) are sequentially connected with the sealing ring (2), the locking ring (3) and the connecting flange (4); the two ends of the sealing frame body (1) are provided with key grooves (11); One end surface of the connecting flange (4) is provided with a card slot (41) corresponding to the keyway (11) on the sealing frame (1), and the inner ring surface (42) of the connecting flange (4) is close to the locking One side of the ring (3) is a tapered surface (421); the tapered surface (421) of the connecting flange (4) and the outer tapered surface (311) provided on the outer surface (31) of the locking ring (3) offset; the inner surface (32) of the locking ring (3) is provided with bayonets or snap rings (33) to lock with the pipe (6), and the side of the outer surface (31) near the sealing ring (2) is an outer tapered surface (311), the vertical end surface (34) on one side of the sealing ring is offset against the sealing ring (2); one side of the sealing ring (2) is connected with the locking ring (3), and the other side is connected with the sealing frame body ( 1) The sealing surface (12) offsets. The length of the outer conical surface (311) of the locking ring is not less than the length of the inner conical surface (421) of the connecting flange.

Preferably, the sealing ring (2) in this application is a flexible graphite sealing ring.

Preferably, the device described in the present application further includes a dismantling ring (5), the dismantling ring (5) is placed in the middle of the sealing frame (1), and the two ends are respectively connected with the pipes (6) on both sides.

Preferably, the dismounting ring (5) is made of elastic material.

Preferably, the device further includes a sealing ring retaining ring (7), and the sealing ring retaining ring (7) is placed on both sides of the sealing ring (2). Preferably, there may be one or more sealing ring retaining rings (7).

When the pipeline described in the present application is a small pipe diameter, preferably, the inner surface (32) of the locking ring is in the shape of a bayonet (33), that is, in the shape of a plurality of pointed threads. Snap the pipe tightly. When the pipeline described in this application has a large pipe diameter, it is difficult for the above-mentioned sharp-toothed thread to be clamped to the pipeline. At this time, a pressure groove (61) is provided at the joint of the pipeline described in this application, corresponding to the pressure groove (61) Yes, the inner surface (32) of the locking ring is in the shape of a snap ring (33); or the joint of the pipe (6) is provided with a boss (61), correspondingly, the inner surface snap ring (33) of the locking ring is groove shape.

Preferably, the locking ring (3) described in this application is a split ring; one or more opening grooves (35) are provided on the ring surfaces at both ends of the locking ring (3).

Preferably, the length of the outer tapered surface (311) of the locking ring in the present application is not less than the length of the inner tapered surface (421) of the connecting flange.

In the actual application process, firstly insert the connecting flange (4), locking ring (3) and sealing ring (2) into the pipe joints of the two pipes (6) in sequence, and then insert the sealing frame (1) Align and insert the keyway (11) at both ends of the connecting flange (4) into the slot (41), use bolts to connect the two flanges that have been aligned, and tighten the connecting bolts of the two connecting flanges (4) to complete Install.

Beneficial effect:

1) This application provides a connection device with simple structure, convenient installation, low cost, good sealing performance and firm connection through the cooperative design of the sealing frame body and the flange;

2) In this application, the graphite sealing ring is used in the static pipeline system, together with the corresponding connection device, which greatly improves the service life of the static pipeline system.

Description of drawings

Figure 1 is a schematic diagram of the explosion structure of the flanged pipeline sealing device;

Fig. 2 Schematic diagram of the cross-sectional structure of the flanged pipeline sealing device;

Figure 3 is a schematic diagram of the connection structure between the connecting flange and the sealing frame;

Fig. 4 is a schematic diagram of the structure in which the lower end surface of the locking ring is in the shape of a bayonet tooth;

Fig. 5 is a structural schematic diagram in which the lower end surface of the locking ring is in the shape of a snap ring;

In the figure: 1-sealing frame body, 2-sealing ring, 3-locking ring, 4-connecting flange, 5-removal ring, 6-pipe, 7-sealing ring retaining ring, 11-keyway of sealing frame body, 12-Sealing surface of sealing frame body, 31-Outer surface of locking ring, 32-Inner surface of locking ring, 33-Snap ring or teeth, 311-Outer cone of outer surface of locking ring, 34-Locking ring 35-opening slot, 36-opening, 41-connecting flange card slot, 42-connecting the inner ring surface of the flange, 421-connecting the tapered surface of the inner ring surface of the flange, 61-pressing groove or boss .

detailed description

The application will be further explained below in conjunction with the accompanying drawings.

As shown in Figure 1-2, it is a schematic structural diagram of a flanged pipeline sealing device provided by this application, which includes a sealing frame 1, two sealing rings 2, two locking rings 3 and two connecting flanges 4. Both sides of the sealing frame body 1 are sequentially connected with the sealing ring 2, the locking ring 3 and the connecting flange 4; the two ends of the sealing frame body 1 are provided with key grooves 11; one part of the connecting flange 4 The side end surface is provided with a card groove 41 corresponding to the keyway 11 on the sealing frame body 1, and the inner ring surface 42 of the connecting flange 4 is a tapered surface 421 on the side close to the locking ring 3; the tapered surface of the connecting flange 4 421 is offset against the outer tapered surface 311 provided on the outer surface 31 of the locking ring 3; the inner surface 32 of the locking ring 3 is provided with a bayonet or snap ring 33 to lock with the pipe 6, and the outer surface 31 is close to the side of the sealing ring 2 It is an outer tapered surface 311, and its vertical end surface 34 on the side close to the sealing ring is against the sealing ring 2;

In order to facilitate disassembly and replacement of parts, preferably, the device described in the present application further includes a disassembly ring 5, which is placed in the middle of the sealing frame body 1, and its two ends are respectively connected to the pipes 6 on both sides. Preferably, the dismounting ring 5 is made of elastic material.

Preferably, the device further includes a sealing ring retaining ring 7 , and the sealing ring retaining ring 7 is placed on both sides of the sealing ring 2 . Preferably, there may be one or more sealing ring retaining rings 7 .

FIG. 3 is a schematic diagram of the connection structure between the sealing frame body 1 and the connecting flange 4 . In order to make the connection between the sealing frame body 1 and the connecting flange 4 more stable, facilitate construction, and reduce production costs, correspondingly, a card slot corresponding to the keyway 11 on the sealing frame body 1 is provided on one end surface of the connecting flange 4 41.

When the pipeline described in the present application is of small diameter, preferably, the inner surface 32 of the locking ring is in the shape of locking teeth 33, that is, in the shape of a plurality of pointed threads, and the connecting device of the present application clamps the pipe through the pointed threads, As shown in Figure 4. When the pipeline described in this application has a large diameter, it is difficult for the above-mentioned sharp-toothed thread to be clamped to the pipeline. At this time, a pressure groove 61 is provided at the joint of the pipeline described in this application, and the corresponding pressure groove 61 is locked. The inner surface 32 of the ring is in the shape of a clasp 33; or the joint of the pipe 6 is provided with a boss 61, and correspondingly, the clasp 33 on the inner surface of the locking ring is in the shape of a groove; as shown in FIG. 5 . Preferably, the lock ring 3 described in this application is a split ring; one or more open grooves 35 are provided on the ring surfaces at both ends of the lock ring 3 .

In the actual installation process, the connecting flange 4, the locking ring 3 and the sealing ring 2 are inserted in sequence at the pipe joints of the two pipes 6, and then the two ends of the sealing frame 1 are respectively inserted into the connection method on both sides. In the flange 4, adjust and align the keyway 11 and the card groove 41, and tighten the two connecting flanges 4 to complete the installation.

The specific working principle is as follows: in the actual application process, the connecting flange 4, the locking ring 3, and the sealing ring 2 are respectively inserted in the pipe joints of the two pipes 6 in sequence, and then the two ends of the sealing frame body 1 are Insert them into the connecting flanges 4 on both sides, adjust and align the keyway 11 and the card groove 41, connect the two flanges with bolts, tighten the connecting bolts of the two connecting flanges 4, and move the connecting flanges axially Make its conical surface 421 squeeze the locking ring 3, and the locking ring 3 will move axially and radially under the push of the conical surface 421 of the connecting flange, and the conical surface 421 of the connecting flange will continue to push. Press the outer tapered surface 311 of the locking ring 3 to make it continue to run in the radial direction, and then the locking teeth 33 of the locking ring 3 bite the pipe or the snap ring 33 fits with the pressure groove 61, and the locking ring 3 has an open groove 35 to ensure Greater deformation of the locking ring 3 in the radial direction. The conical surface 421 of the connecting flange continues to push the locking ring 3 , so that the conical surface 421 of the connecting flange presses the locking ring 3 to reach the maximum radial feed rate of the locking ring 3 . The conical surface 421 of the connecting flange drives the locking ring 3 and the pipe to advance axially, squeezes the sealing ring 2, compresses the sealing ring 2, and the sealing ring 2 deforms radially inward and outward under extrusion, and the pipe 6 is completely sealed with the sealing frame body 1.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. Any equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (9)

1. a flange pipeline sealing device, it is characterised in that this device includes sealing support body (1), two sealing rings (2), two retaining rings (3) and two adpting flanges (4)；The both sides of described sealing support body (1) are connected with sealing ring (2), retaining ring (3) and adpting flange (4) successively；The two ends of described sealing support body (1) are provided with keyway (11)；One side end face of described adpting flange (4) is provided with the draw-in groove (41) corresponding with sealing the upper keyway (11) of support body (1), and the inner ring surface (42) of adpting flange (4) is taper surface (421) near retaining ring (3) side；The male cone (strobilus masculinus) (311) that the taper surface (421) of described adpting flange (4) and retaining ring (3) outer surface (31) are provided with offsets；Described retaining ring (3) inner surface (32) is provided with snap ring (33) and locks with pipeline (6), and nearly sealing ring (2) side of outer surface (31) is male cone (strobilus masculinus) (311), and its edge-on end face of nearly sealing ring one (34) offsets with sealing ring (2)；The side of described sealing ring (2) is connected with retaining ring (3), and opposite side and the sealing surface (12) sealing support body (1) offset.

A kind of flange pipeline sealing device the most according to claim 1, it is characterised in that described sealing ring (2) is flexible graphite sealing ring.

A kind of flange pipeline sealing device the most according to claim 1, it is characterised in that described device also includes that stripping ring (5), described stripping ring (5) are placed in the centre sealing support body (1), and two ends connect with the pipeline (6) of both sides respectively.

A kind of flange pipeline sealing device the most according to claim 3, it is characterised in that described stripping ring (5) is made up of elastomeric material.

A kind of flange pipeline sealing device the most according to claim 1, it is characterised in that described device also includes that sealing ring baffle ring (7), sealing ring baffle ring (7) are placed in the both sides of sealing ring (2).

A kind of flange pipeline sealing device the most according to claim 1, it is characterised in that the latch (33) of described retaining ring inner surface is a plurality of pointed tooth screw thread.

A kind of flange pipeline sealing device the most according to claim 1, it is characterised in that the joint of described pipeline (6) is provided with indent (61), and accordingly, retaining ring inner surface snap ring (33) is projection shape.

A kind of flange pipeline sealing device the most according to claim 1, it is characterised in that described retaining ring (3) is split ring；Described retaining ring (3) two ends anchor ring is provided with one or more open slot (35).

A kind of flange pipeline sealing device the most according to claim 1, it is characterised in that described retaining ring male cone (strobilus masculinus) (311) length is not less than the length of the inner ring surface taper surface (421) of adpting flange.