Valve seat sealing structure of ultralow-temperature ball valve

Abstract

The utility model relates to the technical field of ball valves, in particular to an ultralow-temperature ball valve seat sealing structure which comprises a valve body and two pipelines, the two pipelines are inserted into the two ends of the valve body in a sliding mode respectively, flange plates are fixedly installed at the two ends of the valve body and the ends of the pipelines respectively, and sealing assemblies are arranged at the two ends of the valve body respectively. The sealing assembly comprises two mounting covers and two sliding rods, the two sliding rods are vertically and fixedly mounted on the upper surface and the lower surface of the end of the valve body correspondingly, the two sliding rods are slidably sleeved with sliding plates correspondingly, the two sliding plates are fixedly connected with the two mounting covers correspondingly, and arc-shaped sealing plates are symmetrically and fixedly mounted on the inner walls of the mounting covers. The two installation covers are locked through a locking assembly. After the valve body and the flange plates of the pipeline are fixed through a plurality of screws, the sealing assembly can be controlled to cover and fix the two flange plates at the joint of the valve body and the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and in particular to the valve seat sealing structure of cryogenic ball valves. Background Technology

[0002] In cryogenic environments, such as the transportation systems for cryogenic fluids like natural gas liquefaction, liquid oxygen, and liquid nitrogen, ball valves, as key control components, are mainly used to control and shut off cryogenic fluids. Their sealing performance directly affects the safety and stability of the system.

[0003] Currently, the connection of cryogenic ball valve seats mostly relies on the traditional method of screw fixing. Under cryogenic conditions, the equipment will experience frequent thermal expansion and contraction due to temperature changes. At the same time, the valve will also generate mechanical vibration during opening and closing. As the service time increases, the screws will gradually loosen due to these factors. Once the screws loosen, the sealing performance of the valve seat connection will be damaged, and the medium will easily leak from the gaps, posing a hidden danger to the safe operation of the entire system. Utility Model Content

[0004] The purpose of this utility model is to address the following shortcomings in the prior art by proposing a cryogenic ball valve seat sealing structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The cryogenic ball valve seat sealing structure includes a valve body and two pipes. The two pipes are slidably inserted into both ends of the valve body. Flanges are fixedly installed at both ends of the valve body and the ends of the pipes. Each pair of flanges is fixedly connected by multiple screws. Sealing assemblies are provided at both ends of the valve body. The sealing assembly includes two mounting covers and two sliding rods. The two sliding rods are vertically fixedly installed on the upper and lower surfaces of the valve body ends, and sliding plates are slidably fitted on both sliding rods. The two sliding plates are fixedly connected to the two mounting covers. Arc-shaped sealing plates are symmetrically fixedly installed on the inner wall of the mounting covers. A sealing space is formed between the two sealing plates for the two flanges to be inserted. The two mounting covers are locked by a locking assembly.

[0007] Preferably, the locking assembly includes two pairs of spring rods and multiple locking blocks respectively fixedly installed at the ends of the two pairs of spring rods. A mounting plate is symmetrically fixedly installed on the surface of the mounting cover. A rectangular block is fixedly installed on the lower surface of the upper mounting plate. The lower surface of the rectangular block has symmetrically formed mounting grooves. Multiple spring rods are horizontally fixedly installed in multiple mounting grooves. The groove walls of the mounting grooves have openings that communicate with the outside. Multiple locking blocks are slidably disposed within multiple openings. The surface of the lower mounting plate has a rectangular opening for the rectangular block to pass through. The longitudinal section of the locking block is a right-angled triangle.

[0008] Preferably, a pull plate is fixedly sleeved at one end of the spring rod near the locking block, and the surface of the pull plate is provided with anti-slip texture.

[0009] Preferably, a temperature sensing component is provided inside the mounting cover located below, the temperature sensing component being used to monitor the temperature inside the sealing assembly.

[0010] Preferably, the temperature sensing component includes a temperature sensor fixedly installed inside the mounting cover, and an audible and visual alarm electrically connected to the temperature sensor is fixedly installed on the lower surface of the mounting cover.

[0011] Preferably, the two mounting covers have a sealing layer bonded to their adjacent sides and inner walls, and the sealing layer is made of rubber.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] After the valve body and the pipeline flange are fixed with multiple screws, the controllable sealing assembly can cover and fix the two flanges at the connection between the valve body and the pipeline, ensuring that the sealing performance of the valve seat connection is not compromised even if the screws loosen. Attached Figure Description

[0014] Figure 1 This is a frontal perspective view of the sealing structure of the cryogenic ball valve seat proposed in this utility model.

[0015] Figure 2 This is a three-dimensional structural diagram of the upper mounting cover in the cryogenic ball valve seat sealing structure proposed in this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the lower mounting cover in the cryogenic ball valve seat sealing structure proposed in this utility model.

[0017] Figure 4 for Figure 1 Enlarged view of the structure at point A in the middle;

[0018] Figure 5 for Figure 2Enlarged view of the structure at point B in the middle.

[0019] In the diagram: 1 Valve body, 2 Pipe, 3 Flange, 4 Mounting cover, 5 Slide rod, 6 Slide plate, 7 Sealing plate, 8 Spring rod, 9 Locking block, 10 Mounting plate, 11 Rectangular block, 12 Rectangular opening, 13 Pull plate, 14 Temperature sensor, 15 Audible and visual alarm. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1-5 The cryogenic ball valve seat sealing structure includes a valve body 1 and two pipes 2. The two pipes 2 are slidably inserted into both ends of the valve body 1. Flanges 3 are fixedly installed at both ends of the valve body 1 and the ends of the pipes 2. Each pair of flanges 3 is fixedly connected by multiple screws. Sealing assemblies are provided at both ends of the valve body 1. The sealing assemblies include two mounting covers 4 and two sliding rods 5. The two sliding rods 5 are vertically fixedly installed on the upper and lower surfaces of the ends of the valve body 1, and sliding plates 6 are slidably fitted on the two sliding rods 5. The two sliding plates 6 are fixedly connected to the two mounting covers 4. Arc-shaped sealing plates 7 are symmetrically fixedly installed on the inner wall of the mounting covers 4. A sealing space for the two flanges 3 to be inserted is formed between the two sealing plates 7. The two mounting covers 4 are locked by locking assemblies.

[0022] First, insert the ends of the two pipes 2 into the two ends of the valve body 1 respectively, and make the flange 3 at the end of the pipe 2 abut against the flange 3 at the end of the valve body 1. Then, control the pipe 2 to rotate so that the multiple holes of the two adjacent flanges 3 correspond. Then, pass multiple screws through the multiple holes to fix the two abutting flanges 3. Next, control the two mounting covers 4 in the sealing assembly to move closer to each other until the two mounting covers 4 abut against each other. At this time, the two fixed flanges 3 will enter the two sealing spaces formed between the two pairs of sealing plates 7. The two flanges 3 cannot move laterally between the two pairs of sealing plates 7, and the side of the two mounting covers 4 that is close to each other will abut against the end surfaces of the valve body 1 and the pipe 2. At the same time, the surface of the two fixed flanges 3 will abut against the inner wall of the two mounting covers 4. Then, lock the two mounting covers 4 with the locking assembly.

[0023] The sealing assembly not only secures the valve body 1 to the pipe 2, but also improves the sealing effect at the connection, ensuring that the sealing performance of the valve seat connection is not compromised when the screws loosen.

[0024] The locking assembly includes two pairs of spring rods 8 and multiple locking blocks 9 respectively fixedly installed at the ends of the two pairs of spring rods 8. The surface of the mounting cover 4 is symmetrically fixedly mounted with a mounting plate 10. The lower surface of the upper mounting plate 10 is fixedly mounted with a rectangular block 11. The lower surface of the rectangular block 11 is symmetrically provided with mounting grooves. Multiple spring rods 8 are horizontally fixedly installed in multiple mounting grooves. The groove wall of the mounting groove is provided with a through-hole that communicates with the outside. Multiple locking blocks 9 are slidably arranged in multiple through-holes. The surface of the lower mounting plate 10 is provided with a rectangular opening 12 for the rectangular block 11 to pass through. The longitudinal section of the locking block 9 is a right-angled triangle. A pull plate 13 is fixedly sleeved at one end of the spring rod 8 near the locking block 9. The surface of the pull plate 13 is provided with anti-slip texture.

[0025] When the upper and lower mounting covers 4 are brought closer together, the two rectangular blocks 11 will pass through the two rectangular openings 12 respectively. During this process, the inclined surfaces of multiple locking blocks 9 will slide into contact with the walls of the rectangular openings 12. Under the pressure, multiple spring rods 8 will retract until the upper mounting plate 10 abuts against the lower mounting plate 10. At this time, the locking blocks 9 will also move out of the rectangular openings 12. The pressure force exerted on the locking blocks 9 by the walls of the rectangular openings 12 will disappear, and the locking blocks 9 will quickly move back to their original position under the elastic potential energy of the spring rods 8. At this time, the upper surface of the locking blocks 9 will abut against the lower surface of the lower mounting plate 10, thus forming a locking engagement. When it is necessary to unlock, simply bring the two pull plates 13 below the rectangular blocks 11 closer together, causing the two spring rods 8 inside the rectangular blocks 11 to retract together until the multiple locking blocks 9 move back into the multiple mounting slots respectively. After their upper surfaces no longer contact the lower surface of the mounting plates 10, the two mounting covers 4 can be separated.

[0026] A temperature sensing component is provided inside the mounting cover 4 located below. The temperature sensing component is used to monitor the temperature inside the sealing component. The temperature sensing component includes a temperature sensor 14 fixedly installed inside the mounting cover 4. An audible and visual alarm 15 electrically connected to the temperature sensor 14 is fixedly installed on the lower surface of the mounting cover 4 located below. The mounting cover 4 located below also has an inner cavity. A control module electrically connected to the temperature sensor 14 and the audible and visual alarm 15 is provided inside the inner cavity. The control module is used to receive the signal from the temperature sensor 14 and control the activation and deactivation of the audible and visual alarm 15.

[0027] Temperature sensor 14 is used to monitor the temperature inside the two mounting covers 4. If a leak occurs at the connection between valve body 1 and pipe 2, the leaked medium will accumulate at the bottom of the lower mounting cover 4 under its own gravity, and the temperature inside the two mounting covers 4 will drop significantly. After detecting the temperature drop, temperature sensor 14 will send an electrical signal to the control module. Then, the control module will control the audible and visual alarm 15 to start, so that the audible and visual alarm 15 will emit a strong flash and a piercing alarm sound to attract the attention of the staff and enable them to take timely measures.

[0028] The two mounting covers 4 have a sealing layer bonded to their adjacent sides and inner walls. The sealing layer is made of rubber, which has good sealing performance and can improve the sealing effect at the connection of the two fixed flanges 3. At the same time, when leakage occurs at the connection, the leaked medium can be accumulated inside the two mounting covers 4, preventing it from directly contacting the external environment.

[0029] In this utility model, after the valve body 1 and the flange 3 of the pipeline 2 are fixed by multiple screws, the sealing assembly can be controlled to cover and fix the two flanges 3 at the connection between the valve body 1 and the pipeline 2, so that the sealing performance of the valve seat connection will not be damaged when the screws are loose.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. Ultra-low temperature ball valve seat sealing structure, comprising a valve body (1) and two pipelines (2), characterized in that, The two pipes (2) are slidably inserted into the two ends of the valve body (1). Flanges (3) are fixedly installed at both ends of the valve body (1) and the ends of the pipes (2). Each pair of flanges (3) is fixedly connected by multiple screws. Both ends of the valve body (1) are provided with sealing components. The sealing components include two mounting covers (4) and two sliding rods (5). The two sliding rods (5) are vertically fixedly installed on the upper and lower surfaces of the valve body (1) respectively. Sliding plates (6) are slidably fitted on the two sliding rods (5). The two sliding plates (6) are fixedly connected to the two mounting covers (4) respectively. Arc-shaped sealing plates (7) are symmetrically fixedly installed on the inner wall of the mounting cover (4). A sealing space for the two flanges (3) to be inserted is formed between the two sealing plates (7). The two mounting covers (4) are locked by locking components.

2. The cryogenic ball valve seat sealing structure according to claim 1, characterized in that, The locking assembly includes two pairs of spring rods (8) and multiple locking blocks (9) fixedly installed at the ends of the two pairs of spring rods (8). The mounting cover (4) is symmetrically fixedly mounted with mounting plates (10). A rectangular block (11) is fixedly mounted on the lower surface of the upper mounting plate (10). The lower surface of the rectangular block (11) is symmetrically provided with mounting grooves. Multiple spring rods (8) are horizontally fixedly installed in multiple mounting grooves. The groove wall of the mounting groove is provided with a through-hole that communicates with the outside. Multiple locking blocks (9) are slidably arranged in multiple through-holes. The surface of the lower mounting plate (10) is provided with a rectangular opening (12) for the rectangular block (11) to pass through. The longitudinal section of the locking block (9) is a right triangle.

3. The ultra-low temperature ball valve seat seal structure of claim 2, wherein, A pull plate (13) is fixedly sleeved on one end of the spring rod (8) near the locking block (9), and the surface of the pull plate (13) is provided with anti-slip texture.

4. The ultra-low temperature ball valve seat seal structure of claim 1, wherein, A temperature sensing component is provided inside the mounting cover (4) located below, which is used to monitor the temperature inside the sealing assembly.

5. The ultra-low temperature ball valve seat seal structure of claim 4, wherein, The temperature sensing component includes a temperature sensor (14) fixedly installed inside the mounting cover (4), and an audible and visual alarm (15) electrically connected to the temperature sensor (14) is fixedly installed on the lower surface of the mounting cover (4) located below.

6. The ultra-low temperature ball valve seat seal structure of claim 1, wherein, Both mounting covers (4) have a sealing layer bonded to their inner walls and the side of each other that is close to each other. The sealing layer is made of rubber.

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