Ultralow-temperature stainless steel pipe fitting for LNG (Liquefied Natural Gas)

Abstract

The utility model belongs to the field of liquefied natural gas, particularly relates to an ultralow-temperature stainless steel pipe fitting for liquefied natural gas (LNG), and provides the following scheme aiming at the problems that an existing ultralow-temperature stainless steel pipe fitting for the LNG is large in pressure, easy to leak at a connector, free of protective measures and easy to cause dangers: the ultralow-temperature stainless steel pipe fitting for the LNG comprises two pipe bodies, one end of each pipe body is provided with a connecting flange, a plurality of connecting holes are formed in the connecting flanges, and first fixing bolts are installed in the connecting holes. When leakage occurs at the connecting position, the two second sealing rings are far away from each other at the moment, the second sealing rings drive the first sealing rings to stretch out of the interiors of the round holes, and therefore the leakage is prevented. And meanwhile, the sealing performance can be improved again through the arrangement of a first sealing ring, a second sealing ring and a third sealing ring, and the first sealing ring can make contact with a plurality of elastic switches, so that an external alarm is triggered, and the alarm function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquefied natural gas, in particular to an ultra-low temperature stainless steel pipe fitting for LNG. Background Art

[0002] Ultra-low temperature stainless steel pipe fittings for LNG (liquefied natural gas) are specially designed for the transmission of LNG at extremely low temperatures. These pipe fittings not only need to have good low temperature performance, but also need to meet the requirements of corrosion resistance, high strength, high toughness, etc., to ensure safe and stable operation during the storage, transportation and processing of LNG.

[0003] Existing ultra-low temperature stainless steel pipe fittings for LNG are subject to high pressure and are prone to leakage at the joints. Without protective measures, this can easily cause danger. Utility Model Content

[0004] The utility model aims to solve the shortcomings of ultra-low temperature stainless steel pipe fittings for LNG in the prior art, namely, high pressure, easy leakage at the interface, no protective measures, and easy danger, and proposes an ultra-low temperature stainless steel pipe fitting for LNG.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An ultra-low temperature stainless steel pipe fitting for LNG, comprising two pipe bodies, one end of each of the two pipe bodies is provided with a connecting flange, a plurality of connecting holes are provided inside the connecting flange, a first fixing bolt is installed inside the connecting hole, and a first nut is threadedly sleeved on the outer wall of the first fixing bolt;

[0007] Two outer sleeves, both of which are arranged in a semicircular shape, are respectively located above and below the two tubes and cooperate with each other, and the outer wall of the tube is provided with a sealing assembly for sealing the tube;

[0008] Alarm components for alarming are arranged on both sides of the outer sleeve.

[0009] In a possible design, the sealing assembly includes a second sealing ring slidably mounted on the outer wall of the tube body, one side of the second sealing ring is fixedly connected to an arc-shaped connecting block, and one side of the arc-shaped connecting block is fixedly connected to the first sealing ring.

[0010] In a possible design, circular holes are provided on both sides of the outer sleeve, and the circular holes are used in conjunction with the first sealing ring. Two first arcuate grooves are provided inside the outer sleeve, and the first arcuate grooves are used in conjunction with the second sealing ring.

[0011] In a possible design, a second arc groove is opened in the middle position of the outer sleeve, and the second arc groove is located between the two first arc grooves. A plurality of connecting holes are opened inside the outer sleeve, and the first arc groove and the second arc groove are connected through the connecting holes. The second arc groove is used in conjunction with two connecting flanges.

[0012] In a possible design, a second sealing ring is provided on one side of the second sealing ring, a third sealing ring is provided on an outer wall of the second sealing ring, and a first sealing ring is provided on an outer wall of the first sealing ring.

[0013] In one possible design, the alarm assembly includes a plurality of L-shaped blocks fixedly connected to one side of the outer sleeve, one side of the L-shaped block is provided with an installation cavity, an elastic switch is arranged in front of the interior of the installation cavity, and the elastic switch is used in conjunction with the first sealing ring.

[0014] In a possible design, rectangular connecting blocks are fixedly connected to both sides of the outer sleeve, a second fixing bolt is arranged inside the rectangular connecting block, and a second nut is threadedly sleeved on the outer wall of the second fixing bolt.

[0015] In the present application, when in use, the second sealing ring and the first sealing ring are sleeved on the outer wall of the tube body, and the two tube bodies are connected through the connecting flange. At this time, multiple first fixing bolts and first nuts can be screwed in to ensure the stability of the connection between the two tube bodies, and then the two outer sleeves are buckled from top and bottom. At this time, multiple rectangular connecting blocks are in conflict with each other, and the two outer sleeves can be installed together using multiple second fixing bolts and second nuts;

[0016] At this time, the two connecting flanges are located inside the second arc-shaped groove, the two second sealing rings are respectively located inside the two first arc-shaped grooves, and the two first sealing rings are located inside the two circular holes. When leakage occurs at the connection, the two second sealing rings move away from each other, and the second sealing ring drives the first sealing ring to extend from the inside of the circular hole, and the arc-shaped connecting block contacts the circular hole. Since the arc-shaped connecting block is inclined, the arc-shaped connecting block contacts the circular hole more and more tightly. At the same time, the settings of the first sealing ring, the second sealing ring and the third sealing ring can further improve the sealing performance, and the first sealing ring will contact multiple elastic switches, thereby triggering an external alarm to realize the alarm function.

[0017] Beneficial effects:

[0018] In the utility model, the ultra-low temperature stainless steel pipe fitting for LNG can achieve the effect of sealing the connection between the two pipe bodies through the sealing component, so that when leakage occurs, the device can be guaranteed to operate normally;

[0019] In the utility model, the ultra-low temperature stainless steel pipe fitting for LNG can achieve the effect of timely alarm through the alarm component, thereby quickly and effectively reminding the staff and improving the safety of the device;

[0020] In the utility model, the two tube bodies are connected by a connecting flange, and the two outer sleeves are installed together by using multiple second fixing bolts and second nuts. When leakage occurs at the connection, the two second sealing rings move away from each other, and the second sealing ring drives the first sealing ring to extend from the inside of the circular hole. The arc-shaped connecting block and the circular hole are increasingly tighter. At the same time, the arrangement of the first sealing ring, the second sealing ring and the third sealing ring can further improve the sealing performance, and the first sealing ring will contact multiple elastic switches, thereby triggering an external alarm to realize the alarm function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional structural schematic diagram of an ultra-low temperature stainless steel pipe fitting for LNG proposed in the utility model;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of a pipe body in an ultra-low temperature stainless steel pipe fitting for LNG proposed in the utility model;

[0023] Figure 3 This is a three-dimensional structural schematic diagram of two outer sleeves in an ultra-low temperature stainless steel pipe fitting for LNG proposed by the utility model;

[0024] Figure 4 This is a three-dimensional structural schematic diagram of an inner and outer sleeve of an ultra-low temperature stainless steel pipe fitting for LNG proposed in the utility model;

[0025] Figure 5 This is a three-dimensional structural schematic diagram of a first sealing ring and a second sealing ring of an ultra-low temperature stainless steel pipe fitting for LNG proposed by the utility model.

[0026] In the figure: 1, tube body; 2, outer sleeve; 3, round hole; 4, rectangular connecting block; 5, connecting flange; 6, first fixing bolt; 7, first nut; 8, L-shaped block; 9, first arc groove; 10, second arc groove; 11, connecting hole; 12, mounting cavity; 13, elastic switch; 14, first sealing ring; 15, first sealing ring; 16, arc connecting block; 17, second sealing ring; 18, third sealing ring; 19, second sealing ring; 20, second nut; 21, second fixing bolt. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] Example 1

[0029] Reference Figure 1-5 , an ultra-low temperature stainless steel pipe fitting, comprising: two pipe bodies 1, one end of each of the two pipe bodies 1 is provided with a connecting flange 5, a plurality of connecting holes are opened inside the connecting flange 5, a first fixing bolt 6 is installed inside the connecting hole, a first nut 7 is threadedly sleeved on the outer wall of the first fixing bolt 6, a second sealing ring 17 and a first sealing ring 15 are sleeved on the outer wall of the pipe body 1, and the two pipe bodies 1 are connected through the connecting flange 5, at which time a plurality of first fixing bolts 6 and first nuts 7 can be screwed in, thereby ensuring the stability of the connection between the two pipe bodies 1, and then the two outer sleeves 2 are buckled from top to bottom, at which time a plurality of rectangular connecting blocks 4 are in conflict, and the two outer sleeves 2 can be installed together using a plurality of second fixing bolts 21 and a second nut 20;

[0030] Two outer sleeves 2, both of which are semicircular, are respectively located above and below the two tube bodies 1 and cooperate with each other, the outer wall of the tube body 1 is provided with a sealing assembly for sealing the tube body 1, and the sealing assembly includes a second sealing ring 19 slidably sleeved on the outer wall of the tube body 1, one side of the second sealing ring 19 is fixedly connected with an arc-shaped connecting block 16, and one side of the arc-shaped connecting block 16 is fixedly connected with a first sealing ring 15, both sides of the outer sleeve 2 are provided with circular holes 3, and the circular holes 3 are used in conjunction with the first sealing ring 15, the inner part of the outer sleeve 2 is provided with two first arc-shaped grooves 9, and the first arc-shaped grooves 9 are used in conjunction with the second sealing ring 19, and a second arc-shaped groove 10 is provided in the middle position of the outer sleeve 2, and the second arc-shaped groove 10 is located between the two first arc-shaped grooves 9, and a plurality of connecting holes 11 are provided in the inner part of the outer sleeve 2, and the first arc-shaped groove 9 and the second arc-shaped groove 10 are connected through the connecting holes 11 The second arc groove 10 is connected, and the second arc groove 10 is used in conjunction with the two connecting flanges 5. A second sealing ring 17 is provided on one side of the second sealing ring 19, and a third sealing ring 18 is provided on the outer wall of the second sealing ring 19. The first sealing ring 14 is provided on the outer wall of the first sealing ring 15. At this time, the two connecting flanges 5 are located inside the second arc groove 10, and the two second sealing rings 19 are respectively located inside the two first arc grooves 9. The two first sealing rings 15 are located inside the two circular holes 3. When leakage occurs at the connection, the two second sealing rings 17 move away from each other, and the second sealing ring 17 drives the first sealing ring 15 to extend from the inside of the circular hole 3, and the arc connecting block 16 contacts the circular hole 3. Since the arc connecting block 16 is inclined, the arc connecting block 16 contacts the circular hole 3 more and more tightly. At the same time, the settings of the first sealing ring 14, the second sealing ring 17 and the third sealing ring 18 can further improve the sealing performance;

[0031] Alarm components for alarm are provided on both sides of the outer sleeve 2. The alarm components include multiple L-shaped blocks 8 fixedly connected to one side of the outer sleeve 2. An installation cavity 12 is opened on one side of the L-shaped block 8. An elastic switch 13 is provided in front of the interior of the installation cavity 12. The elastic switch 13 is used in conjunction with a first sealing ring 15. The elastic switch 13 is electrically connected to an external alarm, and the first sealing ring 15 will contact the multiple elastic switches 13, thereby triggering an external alarm to realize the alarm function.

[0032] The present application can be used in the field of liquefied natural gas, and can also be applied to other technical fields of the present application.

[0033] Example 2

[0034] refer to Figure 1-5 , improved on the basis of Example 1: an ultra-low temperature stainless steel pipe fitting for LNG, which is used in the field of liquefied natural gas, wherein rectangular connecting blocks 4 are fixedly connected to both sides of the outer sleeve 2, a second fixing bolt 21 is arranged inside the rectangular connecting block 4, and a second nut 20 is arranged on the outer wall thread sleeve of the second fixing bolt 21.

[0035] However, as is well known to those skilled in the art, the working principle and wiring method of the elastic switch 13 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any selection according to their needs or convenience.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An ultra-low temperature stainless steel pipe fitting for LNG, characterized in that: include: Two pipe bodies (1), one end of each of the two pipe bodies (1) is provided with a connecting flange (5), a plurality of connecting holes are provided inside the connecting flange (5), a first fixing bolt (6) is installed inside the connecting hole, and a first nut (7) is threadedly sleeved on the outer wall of the first fixing bolt (6); Two outer sleeves (2), both of which are arranged in a semicircular shape, and are respectively located above and below the two tube bodies (1) and cooperate with each other, and the outer wall of the tube body (1) is provided with a sealing component for sealing the tube body (1); Alarm components for alarming are arranged on both sides of the outer sleeve (2).

2. The ultra-low temperature stainless steel pipe fitting for LNG according to claim 1, characterized in that: The sealing assembly comprises a second sealing ring (19) slidably sleeved on the outer wall of the tube body (1), one side of the second sealing ring (19) is fixedly connected to an arc-shaped connecting block (16), and one side of the arc-shaped connecting block (16) is fixedly connected to a first sealing ring (15).

3. The ultra-low temperature stainless steel pipe fitting for LNG according to claim 1, characterized in that: Circular holes (3) are provided on both sides of the outer sleeve (2), and the circular holes (3) are used in conjunction with a first sealing ring (15). Two first arc-shaped grooves (9) are provided inside the outer sleeve (2), and the first arc-shaped grooves (9) are used in conjunction with a second sealing ring (19).

4. The ultra-low temperature stainless steel pipe fitting for LNG according to claim 1, characterized in that: A second arc groove (10) is provided in the middle of the outer sleeve (2), and the second arc groove (10) is located between the two first arc grooves (9). A plurality of connecting holes (11) are provided inside the outer sleeve (2), and the first arc groove (9) and the second arc groove (10) are connected via the connecting holes (11). The second arc groove (10) is used in conjunction with two connecting flanges (5).

5. The ultra-low temperature stainless steel pipe fitting for LNG according to claim 2, characterized in that: A second sealing ring (17) is provided on one side of the second sealing ring (19), a third sealing ring (18) is provided on the outer wall of the second sealing ring (19), and a first sealing ring (14) is provided on the outer wall of the first sealing ring (15).

6. The ultra-low temperature stainless steel pipe fitting for LNG according to claim 1, characterized in that: The alarm assembly comprises a plurality of L-shaped blocks (8) fixedly connected to one side of an outer sleeve (2); a mounting cavity (12) is provided on one side of the L-shaped block (8); a resilient switch (13) is provided in front of the interior of the mounting cavity (12); and the resilient switch (13) is used in conjunction with a first sealing ring (15).

7. The ultra-low temperature stainless steel pipe fitting for LNG according to claim 1, characterized in that: Rectangular connection blocks (4) are fixedly connected to both sides of the outer sleeve (2), a second fixing bolt (21) is arranged inside the rectangular connection block (4), and a second nut (20) is threadedly sleeved on the outer wall of the second fixing bolt (21).

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