RU121891U1 - INTEGRAL END FITTINGS OF POLYMERIC REINFORCED HOSE WITH INTERNAL STEEL CHANNEL - Google Patents

Abstract

1. One-piece end fittings of a polymer reinforced sleeve with an internal steel channel, including a sleeve, a nipple, a front ring and a rear ring with tapered bearing surfaces, characterized in that the sleeve contains a crimp zone made with an inner cylindrical, or tapered, threaded, or threadless surface ... ! 2. One-piece end fitting of a polymer reinforced sleeve with an inner steel channel according to claim 1, further comprising a steel or polymer sealing ring installed on the inner steel channel between the sleeve and the end face of the outer and inner polymer layers and reinforcement. ! 3. One-piece end fitting of a polymer reinforced hose with an inner steel channel according to claim 1, wherein the crimp pressure of the sleeve is defined as! ,! where Pvn - clutch compression pressure, Pa; ! Dвн - outer diameter of the sleeve, m; ! D - inner diameter of the sleeve, m; ! P - excess working pressure in the sleeve, Pa; ! l is the length of the sleeve intended for compression, m; ! k is a safety factor that takes into account the uneven distribution of stresses (1.015 ... 1.040).

Description

The invention relates to detachable joints of polymer reinforced pipelines (hoses) and can be used in any sector of the national economy, in particular, in the oil and gas industry.

Known one-piece end fittings of a high-pressure sleeve, including a nipple, a sleeve, which provides sealing of the sleeve due to the force acting on the sleeve [RF Patent No. 2355937, IPC F16L 33/207, 2009]. The coupling is made with annular protrusions of different heights to create zones of power sealing, sealing and reduced compression of the sleeve. For assembly, the outer and inner rubber layers are removed at the end of the sleeve, and during compression, the reinforcement and the inner layer deform.

The disadvantage of the design is the high complexity of manufacturing and low reliability due to the impact of threads on the outer and inner surfaces of the sleeve. It is not possible to use this reinforcement for a polymer reinforced pipeline with an internal steel channel.

The closest is the internal seal for pipe fittings [US Patent No. 7194817 B2, F16L 35/00, B23Q 17/00, G01B 3/00, 2007], which includes a nipple, a sleeve, a front ring and a rear ring, and the cones of the nipple, the front rings and rear rings are made at different angles. The assembly is carried out as follows: first, a sleeve is put on the tube, then the rear ring, the front ring and the nipple; when screwing the nipple due to the force on the rear and front rings, the tube is deformed in the contact zone with the front and rear rings due to different taper. Thus, the seal is sealed.

The disadvantage of this termination is the unreliability in the case of axial loads.

The objective of the invention is to increase the reliability and tightness of the connection of the polymer reinforced pipeline with the internal steel channel at high pressures and axial loading.

The problem is solved in that the one-piece end fittings of a polymer reinforced sleeve with an internal steel channel includes a sleeve, a nipple, a front ring and a rear ring with tapered abutment surfaces. The coupling contains a compression zone made with an inner cylindrical or conical threaded or threadless surface. The integral end fittings of the polymer reinforced sleeve with the inner steel channel may further include a steel or polymer o-ring mounted on the inner steel channel between the sleeve and the end face of the outer and inner polymer layers and the reinforcement. Clutch compression pressure, defined as

,

where P _VN - compression pressure of the coupling, Pa;

D _vn - outer sleeve diameter, m;

D is the inner diameter of the sleeve, m;

P is the excess working pressure in the sleeve, Pa;

l is the length of the coupling, intended for compression, m;

k is the safety factor taking into account the uneven distribution of stresses (1.015 ... 1.040).

Figure 1-4 presents one-piece end fittings of a polymer reinforced sleeve with an internal steel channel, where

1 - inner steel channel;

2 - outer polymer layer;

3 - inner polymer layer;

4 - reinforcement;

5 - nipple;

6 - coupling;

7 - compression zone;

8 - a front ring;

9 - a back ring;

10 - flare nut.

Figure 5 presents one-piece end fittings of a polymer reinforced sleeve with an internal steel channel with a sealing ring, where

1 - inner steel channel;

2 - outer polymer layer;

3 - inner polymer layer;

4 - reinforcement;

5 - nipple;

6 - coupling;

7 - compression zone;

8 - a front ring;

9 - a back ring;

10 - a union nut;

11 - a sealing ring.

Assembly sleeves with end fittings is as follows. At the end of the sleeve, the outer and inner polymer layers 2, 3 and reinforcement 4 are removed. A sleeve 6 is mounted on the sleeve so that the compression zone 7 contacts the outer polymer layer 2. Then, the rear ring 9, the front ring 8, and the nipple are installed on the inner steel channel 1 5. The union nut 10 is pre-installed on the nipple 5. The union nut 10 is necessary for connecting the sleeve to the equipment or another sleeve.

The nipple 5, the front ring 8 and the rear ring 9 are made with conical abutment surfaces. The cones are made at different angles. When screwing the nipple 5 due to different tapers, the front ring 8 and the rear ring 9 compress the inner steel channel 1, due to which sealing is performed.

After assembling the sleeve and reinforcing elements, the sleeve is crimped in zone 7. When the sleeve is crimped, the outer 2 and inner 3 polymer layers and reinforcement 4 are deformed. Due to the connection of the sleeve and sleeve 6 in the compression zone 7, this sleeve can be load-bearing, i.e. perceive axial loads. The axial load from the sleeve is transmitted to the sleeve 6 and then to the nipple 5.

The inner surface of the coupling in the compression zone can be made cylindrical without thread (figure 1), cylindrical with thread (figure 2), tapered without thread (figure 3) and tapered with thread (figure 4). The conical inner surface of the coupling in the compression zone (Figs. 3, 4) is convenient when installing the coupling 6 on the sleeve, and also after compression, the stresses in the sleeve are distributed evenly - no stress concentrator is formed in the sleeve when the sleeve exits the sleeve.

When crimping the sleeve 6 in the compression zone 7 with an internal thread (Figs. 2, 4), a thread profile is formed on the surface of the sleeve, thus, an additional connection can be provided by creating a thread profile.

It is also necessary to prevent the pumped liquid from falling onto the end face of the removed layers 2, 3, 4, since the sleeve may delaminate, therefore, an additional sealing ring 11 can be installed on the inner steel channel 1 between the sleeve 6 and the end face of the outer 2 and inner 3 polymer layers and reinforcement 4 (figure 3), steel or polymer.

Clutch compression is performed to increase the reliability of the connection. The compression pressure is determined from the equilibrium condition in the absence of shear reinforcement during loading by internal pressure.

P _ext · D · _corolla lP · D · l = P · D · z.

where P _VN - compression pressure of the coupling, Pa;

D _vn - outer sleeve diameter, m;

D is the inner diameter of the sleeve, m;

P is the excess working pressure in the sleeve, Pa;

l is the length of the coupling intended for compression (compression zone 7), m

z is the distance from the coupling, where the maximum stresses in the sleeve during expansion from internal pressure, m

.

In laboratory studies, it was found that z is 15-40 mm.

Therefore, the compression of the coupling is carried out under pressure, defined as

,

where k is the safety factor taking into account the uneven distribution of stresses (1.015 ... 1.040).

Thus, the inventive one-piece end fittings allows connection with a polymer reinforced sleeve with an internal steel channel and is reliable and tight.

Information sources:

1. RF patent No. 2355937, IPC F16L 33/207, 2009.

2. US patent No. 7194817 B2, IPC F16L 35/00, B23Q 17/00, G01B 3/00, 2007.

Claims (3)

1. One-piece end fittings of a polymer reinforced sleeve with an internal steel channel, including a sleeve, a nipple, a front ring and a rear ring with tapered abutment surfaces, characterized in that the sleeve contains a compression zone made with an internal cylindrical or conical threaded or threadless surface . 2. One-piece end fittings of a polymer reinforced sleeve with an internal steel channel according to claim 1, characterized in that it can further include a steel or polymer sealing ring mounted on the inner steel channel between the sleeve and the end face of the outer and inner polymer layers and reinforcement. 3. One-piece end fittings of a polymer reinforced sleeve with an internal steel channel according to claim 1, characterized in that the compression pressure of the coupling is defined as

, where P _VN - compression pressure of the coupling, Pa; D _vn - outer sleeve diameter, m; D is the inner diameter of the sleeve, m; P is the excess working pressure in the sleeve, Pa; l is the length of the coupling, intended for compression, m; k is the safety factor taking into account the uneven distribution of stresses (1.015 ... 1.040).