Ultralow-temperature all-welded ball valve with good sealing performance

Abstract

The utility model belongs to the technical field of ball valves, and particularly relates to an ultra-low temperature all-welded ball valve with good sealing performance, which comprises a valve body, a valve seat supporting ring is arranged in the valve body, a double-layer corrugated pipe is fixedly connected between the valve seat supporting ring and the valve body, a V-opening lip-shaped ring is embedded in the upper end of the valve seat supporting ring, and the V-opening lip-shaped ring is fixedly connected with the valve body. The V-opening lip-shaped ring makes contact with the valve body, a valve clack is rotationally connected to the interior of the valve body, the valve clack is slidably connected with the valve seat supporting ring, a heat preservation pipe is fixedly connected to the upper end of the valve body, and a valve rod is rotationally connected to the inner side of the heat preservation pipe. The combination of the double-layer corrugated pipe and the V-opening lip-shaped ring is arranged at the position of the valve seat supporting ring, main and auxiliary double-safety sealing is formed, the double-layer corrugated pipe has excellent sealing performance and is responsible for main sealing, the V-opening lip-shaped ring is responsible for auxiliary sealing, and therefore even if the double-layer corrugated pipe is damaged, the V-opening lip-shaped ring can guarantee sealing, and the sealing performance is improved. Compared with a conventional graphite ring sealing design, the sealing effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a cryogenic fully welded ball valve with good sealing performance. Background Art

[0002] Cryogenic fully welded ball valves are applicable to the control and regulation of cryogenic media such as liquid nitrogen and liquid argon, and are widely used in pipeline systems under cryogenic conditions such as liquefied natural gas, liquid oxygen, liquid nitrogen, and liquid argon. The utility model patent with the publication number of CN204226712U discloses a cryogenic fully welded ball valve, which includes a valve body, a ball valve, a valve stem, a valve seat and a valve cover. A heat preservation pipe is sleeved outside the valve stem, and heat preservation materials are filled in the heat preservation pipe. The top end of the heat preservation pipe is fixedly connected with the valve cover, and the bottom end of the heat preservation pipe is fixedly connected with the valve seat through a support seat. The joints of the heat preservation pipe with the support seat and the valve cover are connected by surfacing welding; due to the setting of the heat preservation pipe, this cryogenic fully welded ball valve can prevent cold energy loss. At the same time, due to the use of full welding connection at each weld, the looseness and external leakage caused by bolt connection are avoided, and metal deformation can be prevented, thereby greatly improving the sealing performance. It can be used in an environment of -196°C - 120°C for a long time without causing seal failure, ensuring the effectiveness of the valve and having a long service life. However, most of the seals between the valve flap and the valve seat support ring of the existing cryogenic fully welded ball valves adopt graphite ring seals. Once the graphite ring wears, the sealing performance will drop to the lowest level or even fail. Therefore, it needs to be improved. Content of the Utility Model

[0003] The purpose of the utility model is to provide a cryogenic fully welded ball valve with good sealing performance, and solve the problem that most of the seals between the valve flap and the valve seat support ring of the existing cryogenic fully welded ball valves adopt graphite ring seals. Once the graphite ring wears, the sealing performance will drop to the lowest level or even fail.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A cryogenic fully welded ball valve with good sealing performance, including a valve body. A valve seat support ring is arranged inside the valve body. A double-layer bellows is fixedly connected between the valve seat support ring and the valve body. A V-lip seal ring is embedded at the upper end of the valve seat support ring, and the V-lip seal ring contacts the valve body. A valve flap is rotatably connected inside the valve body, and the valve flap is slidably connected with the valve seat support ring. A heat preservation pipe is fixedly connected to the upper end of the valve body. A valve stem is rotatably connected to the inner side of the heat preservation pipe. The bottom of the valve stem is threadedly connected with the valve flap. A valve cover is installed on the top of the heat preservation pipe through bolts. A gasket is installed inside the valve cover through bolts. A retaining cover is installed on the upper end of the gasket through bolts, and the retaining cover is rotatably connected with the valve stem. A lubricating mechanism is arranged inside the retaining cover.

[0005] The inner side of the washer is fixedly connected with a lining ring, and the lining ring is rotatably connected with the valve stem. A first spring is fixedly connected inside the upper end of the lining ring, and the first spring is fixedly connected with the retaining cover. Through the arrangement of the first spring, it has the effect of preventing loosening of the bolts for installing the retaining cover.

[0006] The lubrication mechanism includes a sponge block and a pressing block slidably connected inside the retaining cover, and the sponge block and the pressing block are in contact with each other. The upper end of the pressing block is fixedly connected with a pressing rod, the pressing rod penetrates through the retaining cover and extends to the outside of the retaining cover, and the top of the pressing rod is fixedly connected with a button. Oil leakage holes are formed in the inner circumferential wall of the retaining cover. Through the arrangement of the lubrication mechanism, it has a lubricating effect between the retaining cover and the valve stem, reducing the wear between the two.

[0007] The upper end of the pressing block is fixedly connected with a second spring, and the other end of the second spring is fixedly connected to the inner surface of the retaining cover. Through the arrangement of the second spring, it has the effect of assisting the pressing block to reset.

[0008] A hollow guiding block is fixedly connected to the middle section of the rod body of the pressing rod, and the hollow guiding block is slidably connected with the retaining cover. Through the arrangement of the hollow guiding block, it has a guiding effect on the pressing rod and is convenient for adding lubricating oil into the inner cavity of the retaining cover.

[0009] Preferably, a ball is arranged on the side of the pressing block, and the ball is in contact with the inner surface of the retaining cover. Through the arrangement of the ball, the friction between the pressing block and the retaining cover can be reduced.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. By arranging a combination of a double-layer bellows and a V-lip seal ring at the valve seat support ring, the present utility model forms a double-insurance seal of main plus auxiliary. Among them, the double-layer bellows has excellent sealing performance and is responsible for the main seal, and the V-lip seal ring is responsible for the auxiliary seal. In this way, even if the double-layer bellows is damaged, the V-lip seal ring can still ensure the seal, and the sealing effect is better compared with the conventional graphite ring seal design.

[0012] 2. By arranging a lubrication mechanism inside the retaining cover for shielding between the valve cover and the valve stem, the present utility model, among which, by pushing the pressing rod through the button, the pressing rod applies a downward force on the pressing block, thereby using the pressing block to squeeze the sponge block and releasing the lubricating oil in the sponge block to lubricate between the retaining cover and the valve stem, reducing the wear of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional view of the overall structure of the present utility model;

[0014] Figure 2 is the Figure 1 enlarged view of the structure of part A of the present utility model;

[0015] Figure 3 is the enlarged view of part B of the present utility model Figure 1 ;

[0016] Figure 4 is the top view of the hollow guide block of the present utility model Figure 3 ;

[0017] In the figure: 1, valve body; 2, valve flap; 3, valve seat support ring; 4, double-layer bellows; 5, V-lip seal ring; 6, heat preservation pipe; 7, valve stem; 8, valve cover; 9, lubrication mechanism; 10, washer; 11, inner lining ring; 12, spring one; 13, retaining cover; 91, sponge block; 92, pressing block; 93, pressing rod; 94, button; 95, oil leakage hole; 96, spring two; 97, ball; 98, hollow guide block. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0019] Please refer to Figure 1-2 , a cryogenic fully welded ball valve with good sealing performance, including a valve body 1. A valve seat support ring 3 is arranged inside the valve body 1. A double-layer bellows 4 is fixedly connected between the valve seat support ring 3 and the valve body 1. A V-lip seal ring 5 is embedded at the upper end of the valve seat support ring 3, and the V-lip seal ring 5 is in contact with the valve body 1. A valve flap 2 is rotatably connected inside the valve body 1, and the valve flap 2 is slidably connected to the valve seat support ring 3. A heat preservation pipe 6 is fixedly connected to the upper end of the valve body 1. A valve stem 7 is rotatably connected to the inner side of the heat preservation pipe 6. The bottom of the valve stem 7 is threadedly connected to the valve flap 2. A valve cover 8 is installed on the top of the heat preservation pipe 6 through bolts. A washer 10 is installed on the inner side of the valve cover 8 through bolts. A retaining cover 13 is installed on the upper end of the washer 10 through bolts, and the retaining cover 13 is rotatably connected to the valve stem 7. An inner lining ring 11 is fixedly connected to the inner side of the washer 10, and the inner lining ring 11 is rotatably connected to the valve stem 7. A spring one 12 is fixedly connected to the upper end inside the inner lining ring 11, and the spring one 12 is fixedly connected to the retaining cover 13. Through the setting of the spring one 12, it has the effect of preventing loosening of the bolts for installing the retaining cover 13.

[0020] Please refer to Figure 1 , Figure 3, a lubrication mechanism 9 is arranged inside the retaining cover 13. The lubrication mechanism 9 includes a sponge block 91 and a pressing block 92 that are slidably connected inside the retaining cover 13, and the sponge block 91 and the pressing block 92 are in contact with each other. The upper end of the pressing block 92 is fixedly connected to a pressing rod 93. The pressing rod 93 penetrates through the retaining cover 13 and extends to the outside of the retaining cover 13. The top of the pressing rod 93 is fixedly connected to a button 94. An oil leakage hole 95 is formed in the inner circumferential wall of the retaining cover 13. Through the arrangement of the lubrication mechanism 9, it has a lubricating effect between the retaining cover 13 and the valve stem 7, reducing the wear between the two. The upper end of the pressing block 92 is fixedly connected to a second spring 96, and the other end of the second spring 96 is fixedly connected to the inner surface of the retaining cover 13. Through the arrangement of the second spring 96, it has an auxiliary resetting effect on the pressing block 92.

[0021] Please refer to Figure 1 , Figure 3 , Figure 4 , a hollow guiding block 98 is fixedly connected to the middle section of the rod body of the pressing rod 93, and the hollow guiding block 98 is slidably connected to the retaining cover 13. Through the arrangement of the hollow guiding block 98, it has a guiding effect on the pressing rod 93 and is also convenient for adding lubricating oil to the inner cavity of the retaining cover 13. A ball 97 is arranged on the side of the pressing block 92, and the ball 97 is in contact with the inner surface of the retaining cover 13. Through the arrangement of the ball 97, the friction between the pressing block 92 and the retaining cover 13 can be reduced.

[0022] The specific implementation process of the present utility model is as follows: During use, a combination of a double-layer bellows 4 and a V-shaped lip seal 5 is arranged at the valve seat support ring 3 to form a main plus auxiliary double insurance seal. Among them, the double-layer bellows 4 has excellent sealing performance and is responsible for the main seal, and the V-shaped lip seal 5 is responsible for the auxiliary seal. In this way, even if the double-layer bellows 4 is damaged, the V-shaped lip seal 5 can still ensure sealing, and the sealing effect is better compared with the conventional graphite ring seal design. In addition, by pushing the pressing rod 93 through the button 94, the pressing rod 93 applies a downward force on the pressing block 92, so as to use the pressing block 92 to squeeze the sponge block 91 and release the lubricating oil in the sponge block 91 to lubricate between the retaining cover 13 and the valve stem 7, reducing the wear on the valve stem 7.

[0023] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A cryogenic all-welded ball valve with good sealing performance, comprising a valve body (1), characterized in that: Inside the valve body (1), a valve seat support ring (3) is provided. A double-layer bellows (4) is fixedly connected between the valve seat support ring (3) and the valve body (1). At the upper end of the valve seat support ring (3), a V-shaped lip seal ring (5) is embedded, and the V-shaped lip seal ring (5) contacts the valve body (1). Inside the valve body (1), a valve flap (2) is rotatably connected, and the valve flap (2) is slidably connected to the valve seat support ring (3). At the upper end of the valve body (1), a heat preservation pipe (6) is fixedly connected. Inside the heat preservation pipe (6), a valve rod (7) is rotatably connected. The bottom of the valve rod (7) is threadedly connected to the valve flap (2). At the top of the heat preservation pipe (6), a valve cover (8) is installed by bolts. Inside the valve cover (8), a washer (10) is installed by bolts. At the upper end of the washer (10), a retaining cover (13) is installed by bolts, and the retaining cover (13) is rotatably connected to the valve rod (7). Inside the retaining cover (13), a lubrication mechanism (9) is provided.

2. The cryogenic fully welded ball valve with good sealing performance according to claim 1 is characterized in that: Inside the washer (10), a lining ring (11) is fixedly connected, and the lining ring (11) is rotatably connected to the valve rod (7). Inside the upper end of the lining ring (11), a first spring (12) is fixedly connected, and the first spring (12) is fixedly connected to the retaining cover (13).

3. The cryogenic all-welded ball valve with good sealing performance according to claim 1, wherein: The lubrication mechanism (9) includes a sponge block (91) and a pressing block (92) slidably connected inside the retaining cover (13), and the sponge block (91) and the pressing block (92) are in contact with each other. At the upper end of the pressing block (92), a pressing rod (93) is fixedly connected. The pressing rod (93) penetrates through the retaining cover (13) and extends to the outside of the retaining cover (13). At the top of the pressing rod (93), a button (94) is fixedly connected. An oil leakage hole (95) is formed in the inner peripheral wall of the retaining cover (13).

4. The cryogenic all-welded ball valve with good sealing performance according to claim 3, characterized in that: At the upper end of the pressing block (92), a second spring (96) is fixedly connected, and the other end of the second spring (96) is fixedly connected to the inner surface of the retaining cover (13).

5. The cryogenic all-welded ball valve with good sealing performance according to claim 3, wherein: In the middle section of the rod body of the pressing rod (93), a hollow guiding block (98) is fixedly connected, and the hollow guiding block (98) is slidably connected to the retaining cover (13).

6. The cryogenic all-welded ball valve with good sealing performance according to claim 3, wherein: On the side of the pressing block (92), a ball (97) is provided, and the ball (97) contacts the inner surface of the retaining cover (13).

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