Low-temperature corrugated pipe stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a low-temperature corrugated pipe stop valve which comprises a valve seat and a valve cover connected to the valve seat, a valve rod and a corrugated pipe assembly sealed on the outer side of the valve rod are arranged in the valve seat, and a valve clack is arranged at the bottom of the valve rod. Wherein a plurality of connecting assemblies are arranged between the valve clack and the valve rod, a stopping piece for stopping the connecting assemblies is arranged on the outer side of the valve clack, and the valve rod and the valve clack are conveniently and rapidly connected in a detachable mode through the design of the plurality of connecting assemblies. Under the condition that the sealing requirement cannot be met due to damage of the valve clack, the valve clack can be easily replaced only by removing the valve cover and then detaching the stop piece. According to the design, the overall structure is simpler, and the applicability and maintenance convenience of the low-temperature corrugated pipe stop valve are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a low-temperature bellows stop valve. Background Art

[0002] Cryogenic bellows stop valve is mainly used in ethylene and liquefied natural gas transportation devices, mainly used in satellite stations, air separation equipment, petrochemical tail gas separation equipment, and can also be used in liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide cryogenic storage tanks and tank trucks, pressure swing adsorption oxygen production devices and other devices.

[0003] The low-temperature bellows stop valve includes a valve body, a valve seat and a valve disc. The valve disc is controlled by a valve stem to achieve separation and engagement with the valve seat and control the opening and closing of the valve body. A stretchable and compressible closed bellows is usually used for sealing between the valve stem and the valve body to prevent the outflow of the fluid medium. For details, please refer to the low-temperature bellows stop valve disclosed in the prior art Chinese patent announcement number "CN206958264U".

[0004] In practical applications, valve disc damage is a common problem. Long-term use may cause the valve disc to deform or otherwise damage, which in turn affects its sealing performance. The existing valve stem and valve disc connection methods are often difficult to support quick and convenient disassembly and replacement, which shows that there is still room for improvement in product design. Utility Model Content

[0005] The utility model aims to solve the shortcomings of the prior art that the connection between the valve stem and the valve disc is often difficult to support quick and convenient disassembly and replacement, and proposes a low-temperature bellows stop valve.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A low-temperature bellows stop valve is designed, comprising a valve seat and a valve cover connected to the valve seat, a valve stem and a bellows assembly sealed on the outside of the valve stem are arranged inside the valve seat, and a valve disc is arranged at the bottom of the valve stem;

[0008] Wherein, a connecting assembly is arranged between the valve flap and the valve stem, and a stopper for stopping the connecting assembly is arranged on the outer side of the valve flap.

[0009] Furthermore, a sleeve portion is fixedly mounted on the top of the valve disc, and the sleeve portion is sleeved on the lower end of the valve stem, wherein the connecting assembly is arranged between the sleeve portion and the valve stem.

[0010] Furthermore, the connecting assembly includes a fixed tube passed through the sleeve portion, a ball is rotatably connected to the inner side of the fixed tube, at least part of the ball protrudes from the end of the fixed tube, and an annular groove matching the ball is opened on the outer side of the valve stem.

[0011] Furthermore, a sliding seat is slidably connected to the inner side of the fixed tube, the sliding seat stops at the side of the ball, and a spring is fixedly connected between the sliding seat and the inner side of the fixed tube.

[0012] Furthermore, a step position is opened on the side of the inner hole of the fixed tube, the sliding seat is slidably connected to the step position, and the side of the sliding seat facing the ball is set as an arc surface.

[0013] Furthermore, the stopper is a retaining spring, and retaining grooves are provided on the outer sides of the sleeve portion and the fixing tube, and the plurality of retaining grooves are located in the same plane and are commonly retained by the retaining spring.

[0014] The low-temperature bellows stop valve proposed in the utility model has the beneficial effect that: the utility model realizes the convenient disassembly connection between the valve stem and the valve disc by designing multiple connection components. In the case where the valve disc cannot meet the sealing requirements due to damage, it is only necessary to remove the valve cover and then remove the stopper to easily complete the replacement of the valve disc. This design makes the overall structure more concise and significantly improves the applicability and maintenance convenience of the low-temperature bellows stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the stopper of the utility model;

[0017] Figure 3 This is a schematic diagram of the ring groove structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the structure of the connection assembly of the utility model.

[0019] In the figure: 1. valve seat; 2. valve cover; 3. valve stem; 4. bellows assembly; 5. valve disc; 51. sleeve portion; 6. connecting assembly; 61. fixed pipe; 62. ball; 63. ring groove; 64. sliding seat; 65. spring; 66. step position; 7. stopper; 71. slot. DETAILED DESCRIPTION

[0020] 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.

[0021] Reference Figure 1-4 , a low-temperature bellows stop valve, comprising a valve seat 1 and a valve cover 2 connected to the valve seat 1. It should be noted that the valve cover 2 described in this embodiment is connected and fixed to the valve seat 1 by bolts, so that it can be disassembled later to meet the convenience of replacing the internal valve disc 5. A valve stem 3 and a bellows assembly 4 sealed on the outside of the valve stem 3 are arranged inside the valve seat 1. Specifically, the bellows assembly 4 can be set as a stainless steel bellows, and its specific connection method has been disclosed in the prior art and will not be repeated here. A valve disc 5 is arranged at the bottom of the valve stem 3. During specific operation, the valve disc 5 is driven to move by the up and down movement of the valve stem 3 to achieve sealing or opening of the sealing part inside the valve seat 1, thereby completing the cutoff and conduction of the waterway;

[0022] A coupling assembly 6 is provided between the valve flap 5 and the valve stem 3 , and a stopper 7 for stopping the coupling assembly 6 is provided on the outer side of the valve flap 5 .

[0023] In some embodiments, a sleeve portion 51 is fixedly installed on the top of the valve flap 5 in the utility model, and the sleeve portion 51 is sleeved on the lower end of the valve stem 3, wherein the connecting assembly 6 is arranged between the sleeve portion 51 and the valve stem 3. The specific design of the sleeve portion 51 is used for convenient connection of the valve stem 3.

[0024] Furthermore, the connecting assembly 6 in the present embodiment includes a fixing tube 61 passed through the sleeve portion 51, and a ball 62 is rotatably connected to the inner side of the fixing tube 61, and at least a portion of the ball 62 protrudes from the end of the fixing tube 61, wherein an annular groove 63 matched with the ball 62 is provided on the outer side of the valve stem 3, that is, in the present embodiment, the connection and locking between the sleeve portion 51 and the valve stem 3 are achieved by adopting the matching mode of the ball 62 and the annular groove 63, wherein a through hole is provided at the end of the fixing tube 61 in the present embodiment, and the ball 62 protrudes along the through hole, and in addition, at least a portion of the above-mentioned shall not exceed the radius of the ball 62 to prevent the ball 62 from falling from the through hole.

[0025] It should be noted that, in the present embodiment, at least two fixing tubes 61 are provided. Preferably, in the present embodiment, four fixing tubes 61 are circumferentially distributed on the sleeve portion 51. By connecting the fixing tubes 61 with four balls 62, a stable connection between the sleeve portion 51 and the valve stem 3 can be achieved.

[0026] On the basis of the above embodiment, in this embodiment, a slide seat 64 is slidably connected to the inner side of the fixed tube 61 , the slide seat 64 stops at the side of the ball 62 , and a spring 65 is fixedly connected between the slide seat 64 and the inner side of the fixed tube 61 .

[0027] Specifically, in the present embodiment, a spring 65 is designed to increase the reverse thrust during disassembly, that is, during installation, the fixed tube 61 is fixed in the sleeve portion 51 by the stopping and positioning action of the stopper 7. At this time, the spring 65 is squeezed. When the valve flap 5 needs to be disassembled and replaced, the stopper 7 is removed first. At this time, since the sleeve portion 51 loses its stop, it can quickly slide out of the hole of the sleeve portion 51 under the reverse thrust of the spring 65, so as to facilitate removal and separation.

[0028] In a preferred embodiment, in consideration of the sliding limit of the slide seat 64 in order to improve the contact stability between the ball 62 and the annular groove 63 of the valve stem 3, a step position 66 is also opened on the side of the inner hole of the fixed tube 61 in this embodiment, and the slide seat 64 is slidably connected to the step position 66, and the side of the slide seat 64 facing the ball 62 is set as an arc surface.

[0029] That is to say, in this embodiment, when the fixed tube 61 is stopped by the stopper 7, it will move toward the inside of the sleeve portion 51, and at the same time, the ball 62 of the fixed tube 61 contacts the annular groove 63, and the inner ball until the step surface of the step position 66 inside the fixed tube 61 hits the slide seat 64. At this time, the slide seat 64, the ball 62 and the fixed tube 61 are all in a fixed state, thereby ensuring the stable sliding between the ball 62 and the annular groove 63, thereby improving the connection stability.

[0030] In some embodiments, the stop member 7 in the utility model is a retaining spring, and a retaining groove 71 is opened on the outer side of the sleeve portion 51 and the fixed tube 61. The multiple retaining grooves 71 are in the same plane and are commonly clamped by the retaining spring. Of course, in other embodiments, the stop member 7 can also be set as a clamp, which is fixedly connected to the outer side of the sleeve portion 51 through the clamp, and is sleeved on the outer sides of the multiple fixed tubes 61 to achieve stopping and fixing of the fixed tubes 61.

[0031] In summary, the utility model realizes a convenient disassembly connection between the valve stem 3 and the valve disc 5 by designing a plurality of coupling components 6. When the valve disc 5 fails to meet the sealing requirements due to damage, the valve disc 5 can be easily replaced by simply removing the valve cover 2 and then removing the stopper 7. This design makes the overall structure simpler and significantly improves the applicability and maintenance convenience of the low-temperature bellows stop valve.

[0032] 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. A low-temperature bellows stop valve, comprising a valve seat (1) and a valve cover (2) connected to the valve seat (1), a valve stem (3) and a bellows assembly (4) sealed on the outside of the valve stem (3) being arranged inside the valve seat (1), characterized in that: A valve flap (5) is arranged at the bottom of the valve stem (3); A coupling assembly (6) is arranged between the valve flap (5) and the valve stem (3), and a stopper (7) for stopping the coupling assembly (6) is arranged on the outer side of the valve flap (5); a sleeve portion (51) is fixedly installed on the top of the valve flap (5), and the sleeve portion (51) is sleeved on the lower end of the valve stem (3), wherein the coupling assembly (6) is arranged between the sleeve portion (51) and the valve stem (3); the coupling assembly (6) includes a fixing tube (61) inserted into the sleeve portion (51), and a ball (62) is rotatably connected to the inner side of the fixing tube (61), and at least a part of the ball (62) protrudes from the end of the fixing tube (61), and an annular groove (63) adapted to the ball (62) is opened on the outer side of the valve stem (3).

2. The cryogenic bellows stop valve according to claim 1, characterized in that: A sliding seat (64) is also slidably connected to the inner side of the fixed tube (61), and the sliding seat (64) stops at the side of the ball (62). A spring (65) is fixedly connected between the sliding seat (64) and the inner side of the fixed tube (61).

3. The cryogenic bellows stop valve according to claim 2, characterized in that: A step position (66) is also provided on the side of the inner hole of the fixed tube (61), and the sliding seat (64) is slidably connected to the step position (66), and the side of the sliding seat (64) facing the ball (62) is set as an arc surface.

4. The cryogenic bellows stop valve according to claim 1, characterized in that: The stopper (7) is a clamping spring, and clamping grooves (71) are provided on the outer sides of the sleeve portion (51) and the fixing tube (61). The plurality of clamping grooves (71) are located in the same plane and are clamped together by the clamping spring.

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