Low-temperature valve on-line leak detection diagnosis tool

Abstract

The utility model discloses a low temperature valve on-line leak hunting diagnosis tool, which comprises a valve part, a rotating part, an isolation part and a plug part, the rotating part is arranged at the top of the valve part, and a rotating shaft of the rotating part is perpendicular to the axis of the valve part; the isolation part is arranged in the valve part, divides the interior of the valve part into an upper part and a lower part and comprises a through hole, the through hole communicates with the upper part and the lower part of the valve part, the through hole and the rotating part are coaxially arranged, and a circumferential baffle ring is arranged on the hole wall of the lower portion of the through hole; the plug head part comprises a plug head body and a plugging assembly, the plug head body is arranged at the bottom of the rotating part, the plugging assembly is arranged on the outer ring of the plug head body and used for sealing the upper surface of the baffle ring, and the plug head body below the plugging assembly is used for sealing the baffle ring. The chock plug body below the plugging assembly can seal the inner hole of the baffle ring, and primary sealing is provided; the upper surface of the baffle ring can be sealed by the plugging assembly, secondary sealing is provided, and the sealing performance of the low-temperature valve on-line leak hunting diagnosis tool is further enhanced.

Description

Technical Field

[0001] This utility model relates to the field of leak detection and diagnosis technology, and in particular to a tooling for online leak detection and diagnosis of cryogenic valves. Background Technology

[0002] Online leak detection and diagnostic fixtures for cryogenic valves are specialized devices used to detect leaks in cryogenic valves, and are particularly crucial in cryogenic fluid systems such as liquefied natural gas (LNG), liquid nitrogen, and liquid oxygen. These fixtures determine the presence of leaks in valves by detecting pressure changes or gas detectors, displaying real-time pressure, temperature, and other data, promptly identifying anomalies, recording and analyzing data, generating reports, assessing valve status, supporting remote data transmission and monitoring for easy remote management, and automatically triggering alarms and notifications when leaks or abnormal parameters are detected.

[0003] The valves used in this tooling mostly rely on squeezing the sealing material to deform and seal the valve gaps to achieve a sealing effect. When the sealing material wears down, it will reduce the valve's sealing performance. Utility Model Content

[0004] The purpose of this application is to provide an online leak detection and diagnostic tooling for cryogenic valves to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A cryogenic valve online leak detection and diagnostic fixture includes a valve section, a rotating section, an isolation section, and a plug head. The rotating section is located at the top of the valve section, and its axis of rotation is perpendicular to the axis of the valve section. The isolation section is located inside the valve section, dividing the interior of the valve section into upper and lower parts. The isolation section includes a through hole connecting the upper and lower parts of the valve section. The through hole is coaxially arranged with the rotating section, and a circumferential retaining ring is provided on the lower wall of the through hole. The plug head includes a plug body and a sealing assembly. The plug body is located at the bottom of the rotating section, and the sealing assembly is located on the outer ring of the plug body. The sealing assembly is used to seal the upper surface of the retaining ring, and the plug body below the sealing assembly is used to seal the retaining ring.

[0007] Furthermore, the plug head also includes a plugging ring body, and the sealing assembly includes an elastic element and a sealing element. The plugging ring body is disposed circumferentially on the outer wall of the plug head body, and a portion of the plug head body extends downward from the plugging ring body. The sealing element is disposed below the plugging ring body, and the two ends of the elastic element are respectively connected to the plugging ring body and the sealing element. The sealing element is used to seal the upper surface of the retaining ring, and the elastic element is used to provide downward pressure to the sealing element.

[0008] Furthermore, the plug body has several sealing rings on its outer wall extending from the plug ring body.

[0009] Furthermore, the lower surface of the plug ring body is provided with a circumferential groove, the sealing element includes a push ring, a support ring and a sealing block, a plurality of elastic elements are provided in the groove, the upper end of the push ring extends into the groove, the upper and lower ends of the elastic elements are respectively connected to the bottom of the groove and the push ring, and the lower end of the push ring is provided with a support ring and a sealing block in sequence.

[0010] Furthermore, a limiting ring is provided at the lower edge of the plug ring body, and the inner side of the limiting ring and the outer side of the plug body form a limiting groove, with the upper ends of the support ring and the sealing block located within the limiting groove.

[0011] Furthermore, the valve part includes a valve pipe, a first connecting ring, a second connecting ring, and a vertical ring. The first connecting ring and the second connecting ring are respectively disposed at the left and right ends of the valve pipe. The first connecting ring is connected to the first pipe, and the second connecting ring is connected to the second pipe. The vertical ring is disposed at the top of the valve pipe corresponding to the rotating part.

[0012] Furthermore, the isolation section includes a first vertical plate, a second vertical plate, a horizontal plate, and a pressure sensor. The horizontal plate is disposed inside the valve tube and has the through hole. The left and right ends of the horizontal plate are respectively connected to the first vertical plate and the second vertical plate. The upper end of the first vertical plate is connected to the upper left end of the valve tube, and the lower end of the second vertical plate is connected to the lower right end of the valve tube. The pressure sensor is disposed on the lower surface of the horizontal plate.

[0013] Furthermore, the rotating part includes a vertical rod, a ring, and several connecting rods. The connecting rods are arranged radially around the top of the vertical rod, and the ends of the connecting rods are fixedly connected to the inner side of the ring. The vertical rod is threadedly connected to the vertical ring.

[0014] Furthermore, the first connecting ring and the second connecting ring are respectively provided with multiple screw holes. The first connecting ring is connected to the first pipe by bolts, and the second connecting ring is connected to the second pipe by bolts.

[0015] Furthermore, the elastic element is a spring.

[0016] In summary, the technical effects and advantages of this utility model are as follows: the plug body below the sealing component can seal the inner hole of the retaining ring, providing an initial seal; the sealing component can seal the upper surface of the retaining ring, providing a secondary seal, further enhancing the sealing performance of the online leak detection and diagnosis tooling for cryogenic valves; when the sealing block wears and thins, its pressure on the spring decreases, the spring rebounds, and pushes the sealing block downward, making the sealing block and the upper surface of the retaining ring in close contact, which can effectively ensure the sealing performance of the online leak detection and diagnosis tooling for cryogenic valves. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a cryogenic valve online leak detection and diagnosis tooling in one embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of a cryogenic valve online leak detection and diagnosis tooling in one embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the plug head structure in one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the sealing component in one embodiment of the present invention.

[0022] The components are as follows: 1. Valve pipe; 21. First connecting ring; 22. Second connecting ring; 3. Vertical ring; 4. Rotating part; 41. Vertical rod; 42. Ring; 43. Connecting rod; 5. Isolation part; 51. First vertical plate; 52. Second vertical plate; 53. Horizontal plate; 54. Through hole; 55. Retaining ring; 56. Annular groove; 57. Pressure sensor; 6. Plug head; 61. Plug head body; 62. Plug ring body; 63. Receptacle groove; 64. Sealing ring; 65. Sealing assembly; 66. Limiting ring; 67. Limiting groove; 651. Push ring; 652. Support ring; 653. Sealing block; 654. Spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] This embodiment proposes an online leak detection and diagnosis tooling for cryogenic valves, such as... Figures 1-4As shown, the device includes a valve section, a rotating section 4, an isolation section 5, and a plug head 6. The rotating section 4 is located at the top of the valve section, and its axis of rotation is perpendicular to the axis of the valve section. The isolation section 5 is located inside the valve section and divides the interior of the valve section into upper and lower parts. The upper part is connected to the second pipe, and the lower part is connected to the first pipe. The isolation section 5 includes a through hole 54, which connects the upper and lower parts of the valve section. The through hole 54 is coaxially arranged with the rotating section 4. A circumferential retaining ring 55 is provided on the lower wall of the through hole 54, and the through hole 54 above the retaining ring 55 forms an annular groove 56. The plug head 6 includes a plug body 61 and a sealing assembly 65. The plug body 61 is located at the bottom of the rotating section 4, and the sealing assembly 65 is located on the outer ring of the plug body 61. The sealing assembly 65 is used to seal the upper surface of the retaining ring 55, and the plug body 61 below the sealing assembly 65 is used to seal the retaining ring 55. The rotating part 4 is used to drive the plug head 6 to move up and down. When the plug head 61 is inserted into the retaining ring 55, the sealing component 65 seals the upper surface of the retaining ring 55 and the through hole 54 is closed. When the plug head 61 and the sealing component 65 leave the through hole 54, the through hole 54 is opened.

[0026] In this embodiment, the plug body 61 below the sealing assembly 65 can seal the inner hole of the retaining ring 55, providing an initial seal; the sealing assembly 65 can seal the upper surface of the retaining ring 55, providing a secondary seal, further enhancing the sealing performance of the online leak detection and diagnosis tooling for cryogenic valves.

[0027] Furthermore, the plug head 6 also includes a plugging ring body 62, which is used to install the sealing assembly 65. The sealing assembly 65 includes an elastic element and a sealing element. The plugging ring body 62 is circumferentially disposed on the outer wall of the plug head body 61, and a portion of the plug head body 61 extends downward beyond the plugging ring body 62. The portion of the plug head body 61 extending downward beyond the plugging ring body 62 is used to seal the inner hole of the push ring 651. The sealing element is disposed below the plugging ring body 62. The two ends of the elastic element are respectively connected to the plugging ring body 62 and the sealing element. The sealing element is used to seal the upper surface of the retaining ring 55, and the elastic element is used to provide downward pressure to the sealing element. In this embodiment, the elastic element is a spring 654; the elastic element can also be other elastic components.

[0028] Furthermore, the plug body 61 extends outward from the outer wall of the plug ring body 62 and is provided with several sealing rings 64.

[0029] Furthermore, the lower surface of the sealing ring 62 is provided with a circumferential groove 63. The sealing element includes a push ring 651, a support ring 652, and a sealing block 653. Multiple elastic elements are disposed within the groove 63. The upper end of the push ring 651 extends into the groove 63, and the upper and lower ends of the elastic elements are respectively connected to the bottom of the groove 63 and the push ring 651. The lower end of the push ring 651 is provided with the support ring 652 and the sealing block 653 in sequence. The groove 63 has a limiting effect on the up-and-down movement of the push ring 651.

[0030] Furthermore, a limiting ring 66 is provided at the lower edge of the plug ring body 62. The inner side of the limiting ring 66 and the outer side of the plug body 61 form a limiting groove 67, and the upper ends of the support ring 652 and the sealing block 653 are located within the limiting groove 67. The limiting groove 67 has a limiting effect on the up and down movement of the support ring 652 and the sealing block 653.

[0031] The push ring 651 always slides up and down within the groove 63. The support ring 652 connects to the sealing block 653. The groove 63 and the limiting groove 67 prevent the sealing block 653 from tilting during the up and down movement, avoiding gaps between the sealing block 653 and the plug body 61, which would reduce the sealing performance of the sealing assembly 65. Multiple springs 654 are evenly distributed in a circumferential shape. During sealing, the sealing block 653 contacts the retaining ring 55, compressing the springs 654. The groove 63 restricts the push ring 651 to slide only vertically, and the limiting groove 67 restricts the support ring 652 and the sealing block 653 to slide only vertically, ensuring that the sealing block 653 does not tilt. After the sealing block 653 wears and thins, its pressure on the spring 654 decreases, the spring 654 rebounds, and the spring 654 pushes the sealing block 653 down to block the top of the retaining ring 55, thus ensuring the sealing compensation effect of the sealing block 653. Therefore, the above structure can achieve a relatively ideal sealing compensation effect. Moreover, the setting of this sealing structure is not a very complicated technical means and can be applied in practice, which is feasible.

[0032] Furthermore, the valve section includes a valve pipe 1, a first connecting ring 21, a second connecting ring 22, and a vertical ring 3. The first connecting ring 21 and the second connecting ring 22 are respectively located at the left and right ends of the valve pipe 1. The first connecting ring 21 communicates with the first pipe, and the second connecting ring 22 communicates with the second pipe. The vertical ring 3 is located at the top of the valve pipe 1 corresponding to the rotating part 4. The vertical ring 3 and the rotating part 4 are threadedly connected. The first connecting ring 21 and the second connecting ring 22 are respectively provided with multiple screw holes. The first connecting ring 21 is bolted to the first pipe, and the second connecting ring 22 is bolted to the second pipe.

[0033] Furthermore, the isolation section 5 includes a first vertical plate 51, a second vertical plate 52, a horizontal plate 53, and a pressure sensor 57. The horizontal plate 53 is disposed inside the valve pipe 1 and has a through hole 54. The left and right ends of the horizontal plate 53 are connected to the first vertical plate 51 and the second vertical plate 52, respectively. The upper end of the first vertical plate 51 is connected to the upper left end of the valve pipe 1, and the lower end of the second vertical plate 52 is connected to the lower right end of the valve pipe 1. The pressure sensor 57 is disposed on the lower surface of the horizontal plate 53. The pressure sensor 57 is used to detect the internal pressure of the lower part of the valve section.

[0034] Furthermore, the rotating part 4 includes a vertical rod 41, a ring 42 and several connecting rods 43. The connecting rods 43 are arranged radially around the top of the vertical rod 41. The ends of the connecting rods 43 are fixedly connected to the inner side of the ring 42. The vertical rod 41 is threadedly connected to the vertical ring 3. The bottom of the vertical rod 41 is connected to the plug body 61.

[0035] All metal components of this diagnostic tool are made of low-temperature resistant nickel-copper alloy to prevent low-temperature embrittlement. For example, the plug body 61, plug ring body 62, limit ring 66, push ring 651, support ring 652, spring 654, valve pipe 1, first connecting ring 21, second connecting ring 22, and vertical ring 3; the rotating part 4, first vertical plate 51, second vertical plate 52, horizontal plate 53, and retaining ring 55 are all metal components; the sealing block 653 and / or sealing ring 64 are made of low-temperature resistant polytetrafluoroethylene to prevent the sealing material from losing its elasticity and failing to seal effectively due to low temperatures.

[0036] The working process of this embodiment is as follows: Align the left side of the diagnostic tool with the first pipe on the left and the right side with the second pipe on the right. Insert the bolts into the screw holes of the first and second connecting rings on both sides and tighten them. Install the diagnostic tool in the pipe. A common valve is installed on the first pipe away from the diagnostic tool. During leak testing, the common valve is in the closed state and is used to detect the first pipe. Hold the ring 42 and turn it. The ring 42 drives the upright rod 41 to rotate upward along the upright ring 3 through the connecting rod 43, so that the plug head 6 leaves the through hole 54. The cryogenic valve of this tool is opened, and the cryogenic liquid flows from the second pipe into the first pipe through the cryogenic valve. The pressure sensor 57 detects the pressure in real time. When the pressure in the first pipe reaches the test value, rotate the ring 42 in the opposite direction. The ring 42 drives the upright rod 41 to rotate downward along the upright ring 3, so that the plug head 6 moves towards the through hole 54. When the plug head 61 is inserted into the retaining ring 55 in the through hole 54, the sealing ring 64 is blocked by the retaining ring. The sealing block 653 is deformed by compression, filling the gap between the plug body 61 and the retaining ring 55. The cryogenic valve is closed, and the cryogenic liquid stops entering the pipeline. After the sealing block 653 abuts against the upper surface of the retaining ring 55, as the upright rod 41 moves down, the sealing block 653 compresses the spring 654, causing it to contract. The push ring 651 retracts into the receiving groove 63 until the limiting ring 66 is inserted into the annular groove 56. The spring 654 stops contracting, and the sealing block 653 blocks the top of the retaining ring 55, further enhancing the sealing performance of the cryogenic valve. When the sealing block 653 wears and thins, its pressure on the spring 654 decreases, and the spring 654 rebounds, pushing the sealing block 653 away from the limiting groove 67, blocking the top of the retaining ring 55, and ensuring the sealing performance of the cryogenic valve. After the first pipeline is sealed for a period of time, the reading of the pressure sensor 57 is observed. If its value is within the standard range, it indicates that there is no leakage problem in the first pipeline. If its value is below the standard range, it indicates that there is a leakage problem in the first pipeline.

[0037] For ease of explanation, spatial relative terms such as "upper," "lower," "outer," and "inner" are used in the embodiments to describe the relationship of one element or feature relative to another element or feature shown in the figures. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device during use or operation. Therefore, the exemplary term "lower" can encompass both upper and lower orientations.

[0038] Moreover, relational terms such as “3” and “4” are merely used to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0039] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not limiting. Those skilled in the art can make many specific modifications under the guidance of the present invention without departing from the spirit and scope of the claims, and these modifications all fall within the scope of protection of the present invention.

Claims

1. A low temperature valve on-line leak detection diagnostic tool, characterized in that, The valve device comprises a valve part, a rotating part, an isolation part and a plug head part, the rotating part is arranged on the top of the valve part, the rotating shaft of the rotating part is perpendicular to the axis of the valve part, the isolation part is arranged inside the valve part, the isolation part divides the inside of the valve part into two parts, the isolation part comprises a through hole, the through hole connects the two parts of the valve part, the through hole is coaxially arranged with the rotating part, a circumferential blocking ring is arranged on the lower hole wall of the through hole, the plug head part comprises a plug head body and a sealing assembly, the plug head body is arranged on the bottom of the rotating part, the sealing assembly is arranged on the outer circle of the plug head body, the sealing assembly is used for sealing the upper surface of the blocking ring, and the plug head body below the sealing assembly is used for sealing the blocking ring.

2. The cryogenic valve on-line leak detection diagnostic tool of claim 1, wherein, The plug head part further comprises a blocking ring body, the sealing assembly comprises an elastic member and a sealing member, the blocking ring body is circumferentially arranged on the outer wall of the plug head body, part of the plug head body extends downwardly beyond the blocking ring body, the sealing member is arranged below the blocking ring body, the two ends of the elastic member are respectively connected with the blocking ring body and the sealing member, the sealing member is used for sealing the upper surface of the blocking ring, and the elastic member is used for providing downward pressure to the sealing member.

3. The cryogenic valve on-line leak detection diagnostic tool of claim 2, wherein, The outer wall of the plug head body extending beyond the blocking ring body is provided with a plurality of sealing rings.

4. The cryogenic valve on-line leak detection diagnostic tool of claim 2, wherein, The lower surface of the blocking ring body is provided with a circumferential container groove, the sealing member comprises a pushing ring, a supporting ring and a sealing block, a plurality of elastic members are arranged in the container groove, the upper end of the pushing ring extends into the container groove, the upper and lower ends of the elastic member are respectively connected with the groove bottom and the pushing ring, and the lower end of the pushing ring is sequentially provided with the supporting ring and the sealing block.

5. The cryogenic valve on-line leak detection diagnostic tool of claim 4, wherein, The lower end edge of the blocking ring body is provided with a limiting ring, the inner side of the limiting ring and the outer side of the plug head body form a limiting groove, and the upper ends of the supporting ring and the sealing block are located in the limiting groove.

6. The cryogenic valve on-line leak detection diagnostic tool of claim 1, wherein, The valve part comprises a valve pipe, a first connecting ring, a second connecting ring and a vertical ring, the first connecting ring and the second connecting ring are respectively arranged on the left and right ends of the valve pipe, the first connecting ring is communicated with a first pipeline, the second connecting ring is communicated with a second pipeline, and the vertical ring is arranged on the top of the valve pipe corresponding to the rotating part.

7. The cryogenic valve on-line leak detection diagnostic tool of claim 6, wherein, The isolation part comprises a first vertical plate, a second vertical plate, a horizontal plate and a pressure sensor, the horizontal plate is arranged inside the valve pipe, the through hole is arranged on the horizontal plate, the left and right ends of the horizontal plate are respectively connected with the first vertical plate and the second vertical plate, the upper end of the first vertical plate is connected with the upper part of the left end of the valve pipe, the lower end of the second vertical plate is connected with the lower part of the right end of the valve pipe, and the pressure sensor is arranged on the lower surface of the horizontal plate.

8. The cryogenic valve on-line leak detection diagnostic tool of claim 1, wherein, The rotating part comprises a vertical rod, a ring and a plurality of connecting rods, the connecting rods are radially arranged on the top of the vertical rod, the end parts of the connecting rods are fixedly connected with the inner side of the ring, and the vertical rod is threadedly connected with the vertical ring.

9. The cryogenic valve on-line leak detection diagnostic tool of claim 6, wherein, A plurality of screw holes are respectively arranged on the first connecting ring and the second connecting ring, the first connecting ring is connected with the first pipeline through bolts, and the second connecting ring is connected with the second pipeline through bolts.

10. The cryogenic valve on-line leak detection diagnostic tool of claim 2, wherein, The elastic member is a spring.

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