CN104048124B - Redundant seal pipe joint - Google Patents

Abstract

The redundant sealing pipeline joint of the present invention relates to a pipeline joint used in filling systems with high sealing requirements. The purpose of the invention is to provide a redundant sealing pipe joint with simple structure, reliable sealing, easy operation and online detection of the sealing effect of the pipe joint. The redundant sealing pipeline joint of the present invention includes a sealing seat, a sealing cone, an end face seal, a radial seal and a fastener, and the sealing seat includes a first axial protrusion, a first annular flange and a second integrally formed A welding end, the sealing cone includes a second axial protrusion, a second annular flange and a second welding end integrally made, the end face of the second axial protrusion is in contact with the end face of the first annular flange, and the end face The seal is located on the mating surface, the front end of the second axial protrusion is sleeved in the first annular flange, the radial seal is located in the radial mating surface, and the fastener is used to fix the sealing seat With the sealing cone, a pressure measuring channel is arranged on the first annular flange, and a sealing cap is connected to the outlet port of the pressure measuring channel.

Description

Redundant Sealed Line Fittings

technical field

The invention relates to a pipeline sealing structure, in particular to a pipeline joint used in a filling system with high sealing requirements.

Background technique

Some low-temperature filling systems such as automobile gas filling stations and some normal-temperature flammable, explosive or toxic gas filling systems have relatively high requirements for the sealing of the pipeline interface. In some low-temperature filling systems, the low-temperature medium is due to Its boiling point temperature is low, so that the metal materials and non-metallic materials it contacts are prone to large cold shrinkage. In the case of low-temperature cold shrinkage of pipeline materials, the sealing effect of the existing pipeline sealing structure is greatly reduced or even Can lead to sealing failure; In addition, in the prior art, when leaking occurs at the sealing structure in the sealing system, the existing sealing leak detection device is used to detect it is not convenient and fast enough, and the detection device and detection device in the prior art The program is also relatively complicated, and it is impossible to carry out online detection of seal leakage. In addition, it is impossible or inconvenient for personnel to perform seal leak detection of pipeline joints in confined spaces and narrow spaces.

Contents of the invention

The technical problem to be solved by the present invention is to provide a redundant sealed pipeline joint with simple structure, reliable sealing and easy operation, and capable of online detection of the sealing effect of the pipeline joint.

The redundant sealing pipeline joint of the present invention includes a sealing seat, a sealing cone, an end face seal, a radial seal and a fastener, and the sealing seat includes a first axial protrusion, a first annular flange and a first The welding end, the first axial protrusion, the first annular flange and the first welding end are integrally formed, and the sealing cone includes a second axial protrusion, a second annular flange and the second welding end, the second axial protrusion, the second annular flange and the second welding end are integrally made, and the fastener is installed on the first annular flange On the second annular flange, the sealing seat and the sealing cone are fixedly connected through the fastener, the first welding end is connected to one end of the pipeline, and the second welding end is connected to the The other end of the tubing is connected,

The second axial protrusion is divided into a first step, a second step, a third step and a fourth step, the end face of the first step is in contact with the outer end face of the first annular flange, and the end face The seal is located on the mating surface of the first step and the first annular flange, and the second step, the third step and the fourth step are all sleeved on the first annular flange and the first annular flange. inside the first axial protrusion, the radial seal is located between the third step and the radial mating surface of the first annular flange, the end face seal, the radial seal , a closed cavity is formed between the sealing seat and the sealing cone,

A pressure measuring channel is provided on the first annular flange, the inlet end of the pressure measuring channel communicates with the closed cavity, and the gas outlet end of the pressure measuring channel is located on the first annular flange On the outer peripheral surface of the pressure measuring channel, a sealing cap is connected to the gas outlet end of the pressure measuring channel, and the lower end of the sealing cap extends into the pressure measuring channel.

In the redundant sealing pipeline joint of the present invention, a first annular sealing groove is formed on the end surface of the first step, and the end surface sealing member is located in the first annular sealing groove.

In the redundant sealing pipe joint of the present invention, the end face seal is a T-shaped sealing ring.

In the redundant sealing pipeline joint of the present invention, a hemispherical groove is opened on the outer peripheral surface of the fourth step.

The redundant sealing pipeline joint of the present invention, wherein a first radial seal limiter is provided on the right side of the radial seal and at the mating surface of the fourth step and the first annular flange retaining ring.

The redundant sealing pipeline joint of the present invention, wherein a second stopper is provided on the right side of the stopper ring of the first radial seal and at the mating surface between the fourth step and the first annular flange The retaining ring, the second limit retaining ring is located in the hemispherical groove.

In the redundant sealing pipeline joint of the present invention, the radial sealing member is a spring tension sealing ring.

In the redundant sealing pipeline joint of the present invention, the sealing cap is threadedly connected to the pressure measuring channel.

The difference between the redundant sealed pipeline joint of the present invention and the prior art is that the redundant sealed pipeline joint of the present invention includes a sealing seat, a sealing cone, an end face seal, a radial seal and a fastener, and the sealing seat and The mating surface of the sealing cone is provided with an end seal and a radial seal. Since the end seal is also provided, when the radial seal leaks accidentally due to cold shrinkage or damage, the redundancy of the end seal will Sealing effect to prevent the problem of seal failure due to radial sealing; the end face seal, the radial seal, the inner peripheral surface of the first axial protrusion and the outer circumference of the second axial protrusion The surface is surrounded by a closed cavity. When gas leakage occurs at the seal of the end face, the leaked gas enters the closed cavity, forming a certain air pressure in the closed cavity, and the air pressure in the closed cavity will rise. Due to the closed cavity and the pressure measurement The channels are connected, and the leaked gas will enter the pressure measurement channel, and the gas will flow through the inlet end of the pressure measurement channel to the outlet end of the pressure measurement channel. The outlet end of the pressure measurement channel is connected with a sealing cap. When performing air tightness inspection or when there is medium flow in the pressure measuring channel, slowly remove the sealing cap. During the process of unscrewing the sealing cap, pay attention to check whether there is gas ejection from the detection port. If there is no leakage or If the sealing effect cannot be determined, all the sealing caps can be unscrewed, and then some external detection equipment can be connected, so that the online detection of the sealing performance of the pipeline joint can be realized. The redundant sealing pipeline joint of the present invention can be applied to ultra-low temperature filling systems, and some flammable and explosive systems at room temperature or toxic gas filling systems with high sealing requirements, and can be applied to single-layer pipelines and foam insulation pipes The sealing device has the advantages of simple structure, strong reliability, simple operation and easy commercialization.

In the redundant sealing pipeline joint of the present invention, the first radial seal limit retaining ring is used to limit the position of the radial seal spring tension seal ring, and the second limit retaining ring is clamped and fixed on the hemisphere In the shaped groove, it is used for the limit of the limit stop ring of the first radial seal, so as to form an effective radial seal effect.

The redundant sealed pipeline joint of the present invention will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the assembly diagram of the redundant sealing pipeline joint of the present invention;

Fig. 2 is a cross-sectional view of the redundant sealing pipeline joint of the present invention;

Fig. 3 is a perspective view of a sealing seat in a redundant sealing pipeline joint of the present invention;

Fig. 4 is a front view of the sealing cone in the redundant sealing pipeline joint of the present invention.

detailed description

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the redundant sealing pipeline joint of the present invention includes a sealing seat 1, a sealing cone 2, an end face seal 3, a radial seal 4 and a fastener 5, and the sealing seat 1 includes the first axial protrusion 11, the first annular flange 12 and the first welding end 13, the first axial protrusion 11, the first annular flange 12 and the first welding end 13 are integrally made, The sealing cone 2 includes a second axial protrusion 21, a second annular flange 22 and a second welding end 23, and the second axial protrusion 21, the second annular flange 22 and the second welding end 23 are integrally made The fastener 5 is installed on the first annular flange 12 and the second annular flange 22, and the sealing seat 1 and the sealing cone 2 are fixedly connected through the fastener 5. There are several fasteners 5, and the tightness Firmware 5 is the bolts and nuts for supporting use. The number of bolts and nuts for supporting use is eight groups. The bolts and nuts for eight groups of supporting use are evenly distributed. The number of supporting bolts and nuts can be adjusted according to the size of the connecting pipeline. The first welding end 13 is connected to one end of the pipeline, and the second welding end 23 is connected to the other end of the pipeline,

The second axial projection 21 is divided into a first step 211, a second step 212, a third step 213 and a fourth step 214, the end face of the first step 211 is in contact with the outer end face of the first annular flange 12, the first step A first annular sealing groove 2111 is defined on the end surface of the step 211, and the end sealing member 3 is located in the first annular sealing groove 2111, and the end sealing member 3 is a T-shaped sealing ring. When the sealing seat 1 and the sealing cone 2 are connected by fasteners, the T-shaped sealing ring is subjected to axial extrusion force, thereby contacting the end face of the first annular flange 12, thereby forming an effective end face seal, and at the same time It also plays a certain dust-proof effect on the radial seal, and can also prevent the freezing problem caused by the condensed water caused by the low-temperature medium on the radial surface matched by the seal seat 1 and the seal cone 2 during the filling process. The second step 212 is sleeved in the first annular flange 12 and the first axial protrusion 11, and the radial seal 4 is located in the radial mating surface of the third step 213 and the first annular flange 12. The sealing member 4 is a spring tension sealing ring. On the right side of the radial seal 4 and at the mating surface between the fourth step 214 and the first annular flange 12 , a first radial seal stop ring 9 is provided. A hemispherical groove 2141 is defined on the outer peripheral surface of the fourth step 214 . On the right side of the stop ring 9 of the first radial seal and at the mating surface between the fourth step 214 and the first annular flange 12, a second stop ring 10 is provided. The second stop ring 10 Located in the hemispherical groove 2141.

A closed cavity 8 is formed between the end face seal, the radial seal, the seal seat and the sealing cone, the first annular flange 12 is provided with a pressure measuring channel 6, and the inlet end of the pressure measuring channel 6 is connected to the closed cavity 8 The gas outlet end of the pressure measurement channel 6 is located on the outer peripheral surface of the first annular flange 12 , the gas outlet end of the pressure measurement channel 6 is provided with an internal thread, and the pressure measurement channel 6 is connected with a sealing cap 7 through threads. When there is a problem with the end face sealing and gas leaks, the leaked gas will enter the closed cavity 8, and the air pressure in the closed cavity 8 will rise. Since the closed cavity 8 is connected to the pressure measuring channel 6, the leakage The gas will enter the pressure measurement channel 6, and the gas flows through the inlet end of the pressure measurement channel 6 to the gas outlet end of the pressure measurement channel 6.

When testing, slowly remove the sealing cap 7. During the process of loosening the sealing cap 7, pay attention to check whether there is gas ejected from the outlet end of the pressure measuring channel 6. If it is impossible to determine whether there is leakage or cannot To determine the effect of airtightness, you can unscrew all the sealing caps, and then connect the detection device on the pressure measurement channel 6, for example, connect a rubber hose or other hoses to the pressure measurement channel 6, connect the rubber hose or other soft The outlet of the tube is placed at a certain depth in the water dissolver to observe whether there are bubbles at the nozzle of the hose, so as to realize the online detection of the air tightness of the pipeline; the pressure measurement channel 6 can also be connected to the pressure sensor, and the collected data Leading to the control room through cables, the pressure value of each pipeline joint can be displayed remotely and intensively, and an audible and visual alarm will be given when a certain pressure value is reached, so as to monitor the performance of the radial main seal; in addition, the pressure measurement channel can also be used 6 Connect the gas concentration detector, the collected data is led to the control room through the cable, and the sound and light alarm will be given when the specified concentration is reached, and the sealing performance of each pipeline interface can be monitored remotely, and the monitoring data can be connected to the Internet to achieve more remote monitoring; or the pressure measurement channel 6 is connected to the pipeline, and the pipelines of the pressure measurement channel 6 of different pipeline joints are summarized, and the leaked gas is discharged and treated in a centralized manner to ensure the safety of the pipeline joint site.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (5)

1. a kind of redundant seal pipe joint, it is characterised in that：Including seal receptacle (1), sealed taper (2), edge face sealing member (3), Radial seal (4) and fastener (5), the seal receptacle (1) including the first axial projection (11), the first collar flange (12) and First welding ends (13), first axial projection (11), first collar flange (12) and first welding ends (13) It is integrated and is made, the sealed taper (2) includes the second axial projection (21), the second collar flange (22) and the second welding ends (23), second axial projection (21), second collar flange (22) and second welding ends (23) are integrated and are made, The fastener (5) on first collar flange (12) with second collar flange (22), the seal receptacle (1) Achieved a fixed connection by the fastener (5) with the sealed taper (2), first welding ends (13) connects with one end of pipeline Connect, second welding ends (23) is connected with the other end of pipeline,

Second axial projection (21) is divided into first step (211), second step (212), the 3rd step (213) and the 4th Rank (214), the end face of the first step (211) is docked with the outer face of first collar flange (12), and the end face is close Sealing (3) is docked in mating surface positioned at the first step (211) and the first collar flange (12), the second step (212), the 3rd step (213) and the 4th step (214) are socketed on first collar flange (12) and the first axle To in raised (11), the radial seal (4) is positioned at the footpath of the 3rd step (213) and first collar flange (12) To between mating surface, the edge face sealing member (3), the radial seal (4), the seal receptacle (1) and the sealed taper (2) Between formed closed cavity (8),

Measuring pressure passage (6), the inlet end of the measuring pressure passage (6) and the closing are provided with first collar flange (12) Cavity (8) is connected, and the outlet side of the measuring pressure passage (6) is located on the outer peripheral face of first collar flange (12), described The outlet side of measuring pressure passage (6) is connected with seal cap (7), and the lower end of the seal cap (7) extend into the measuring pressure passage (6) It is interior,

The first annular seal pocket (2111) is offered on the end face of the first step (211), the edge face sealing member (3) is located at In first annular seal pocket (2111),

The edge face sealing member (3) is T-shaped sealing ring, and the radial seal (4) is spring tension sealing ring,

Redundant seal pipe joint is applied to the inflammable and explosive system of ultralow temperature loading system, seal request normal temperature high or has poison gas In body loading system, the joint sealing in individual layer pipeline, foamed heat insulation pipeline or the huge pipe line of vacuum multi-layer is also applied to.

2. redundant seal pipe joint according to claim 1, it is characterised in that：The periphery of the 4th step (214) Semi-spherical grooves (2141) are offered on face.

3. redundant seal pipe joint according to claim 2, it is characterised in that：On the right side of the radial seal (4) The first radial seal is provided with side and the mating surface positioned at the 4th step (214) with first collar flange (12) Spacing back-up ring (9).

4. redundant seal pipe joint according to claim 3, it is characterised in that：It is spacing in first radial seal The second limit is provided with the right side of back-up ring (9) and the mating surface positioned at the 4th step (214) with first collar flange (12) Position back-up ring (10), the second spacing back-up ring (10) is in the semi-spherical grooves (2141).

5. redundant seal pipe joint according to claim 4, it is characterised in that：The seal cap (7) and the pressure measurement Passage (6) is threaded connection.