Low-pressure bypass valve sealing device

Abstract

The utility model relates to a low-pressure bypass valve sealing device which aims at improving the sealing effect and achieving dynamic pressure balance. The device comprises a son pipe and a corresponding mother pipe, a sealing structure is sleeved outside the joint of the son pipe and the mother pipe, and the sealing structure is composed of an external sealing cabin and an internal sealing piece. The inner sealing piece is in close contact with the pipe body through the rubber plug, the through hole is communicated with the inner sealing piece and the outer sealing cabin, and a movable sealing plug is contained in the through hole. Along with the rise of temperature and pressure, liquid enters the internal sealing element, and when the pressure is increased, the liquid breaks through the sealing plug and enters the cavity to jack up the sealing plug. The external sealed cabin can be filled with high-density gas or liquid, the pressure is increased, dynamic balance is achieved, the liquid is released to relieve the pressure of the bypass valve, high pressure is avoided, and meanwhile the cooling effect is achieved. The external sealing cabin is composed of an outer shell and a sealing cover which are connected through threads, and a connecting hole in the sealing cover is used for being connected with external supercharging equipment.

Description

Technical Field

[0001] The utility model provides a sealing device, which belongs to the technical field of high-pressure bypass valves, and particularly relates to a sealing device for a low-pressure bypass valve. Background Art

[0002] A low-pressure bypass valve is a control valve used in industrial systems. It is mainly used to allow fluid to bypass the main control valve and flow directly when the system pressure is lower than the set value, so as to protect the system from the influence of excessively low pressure and ensure the stability and safety of fluid flow. The basic structure of its existing sealing device usually includes components such as valve seat, valve core, packing and spring. The valve seat and valve core cooperate to form a sealing surface. The packing is used to enhance the sealing effect, and the spring is used to maintain the contact pressure between the valve core and the valve seat to achieve better sealing performance.

[0003] When the existing sealing device is in use, when steam flows through the air inlet hole of the valve cage, a small amount of steam is converted from saturated steam to wet steam due to the throttling effect of the air inlet hole and the vacuum behind the valve. The droplets in the wet steam increase the degree of erosion of the steam flow on the sealing surface, which can easily cause the internal pressure and temperature to rise, affecting normal use. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the embodiments of the present application provide a low-pressure bypass valve sealing device, thereby solving the problem that the existing low-pressure bypass valve sealing device has certain limitations in use.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a low-pressure bypass valve sealing device, comprising a sub-pipe and a main pipe corresponding to the sub-pipe, wherein a sealing structure is provided on the outside of the connection between the sub-pipe and the main pipe, and the sealing structure comprises an external sealing cabin and an internal sealing member;

[0006] The internal seal is tightly attached to the sub-tube and the main tube through a plurality of groups of evenly distributed rubber plugs, and the external sealing chamber is sleeved on the outside of the internal seal; the internal seal is provided with a through hole running through the internal seal;

[0007] The through hole communicates with the internal sealing component and the external sealing cabin, and a sealing plug is movably connected in the through hole.

[0008] Preferably, the external sealed cabin comprises a pair of outer shells connected to each other correspondingly, and the ends of the outer shells away from each other are both provided with sealing covers, and the outer shells and the outer shells and the sealing covers are connected by threads.

[0009] Preferably, the sealing cover is provided with a connecting hole penetrating the sealing cover, the connecting hole is connected to an external pressurizing device, and the sealing cover is penetrated by the sub-pipe and the main pipe respectively and sealed.

[0010] Preferably, the internal sealing member is provided with fixing members corresponding to the sub-tube and the main tube respectively and clamped on both sides of the rubber plug. The fixing members and the rubber plug are located on both sides of the through hole, and the rubber plug and the fixing members form a cavity.

[0011] Preferably, the through hole is provided with a plurality of evenly distributed reset springs correspondingly connected to the sealing plug, the reset springs are placed in the side walls of the through hole, and extrusion springs placed inside the internal seal and fixedly connected to the rubber plug are provided on both sides of the through hole.

[0012] Preferably, a corresponding rubber sealing ring is provided at the connection between the sub-tube and the main tube, and the rubber sealing ring is located inside the internal sealing component.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0014] The utility model realizes the sealing effect by arranging a sealing structure which is sleeved on the outside of the sub-tube and the main tube, and directly contacts the connection of the tube body with the help of the internal sealing member. When the temperature and pressure rise, liquid will inevitably overflow into the internal sealing member. When the liquid pressure gradually increases, it will break through the seal of the nearest sealing plug and enter the interior of the cavity. When the liquid gradually increases, it will push up the sealing plug, and the external sealing chamber will be filled with high-density gas such as nitrogen or other liquid to increase the pressure in the external sealing chamber, thereby achieving a dynamic balance between the external sealing chamber and the internal sealing member. By releasing a part of the liquid, the pressure in the bypass valve is relieved to avoid high pressure. At the same time, the gas or liquid rushed in can also have a cooling effect.

[0015] Other advantages, objectives and features of the present invention will be described in part in the following description and will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the installation of a low-pressure bypass valve sealing device of the utility model;

[0017] Figure 2 This is an exploded view of a low-pressure bypass valve sealing device of the utility model;

[0018] Figure 3 This is a cross-sectional view of a low-pressure bypass valve sealing device of the utility model;

[0019] Figure 4 This is a partial enlarged view of a low-pressure bypass valve sealing device of the utility model.

[0020] As shown in the figure:

[0021] 1. Sub-tube;

[0022] 11. Main pipe; 12. Outer shell; 13. Sealing cover; 14. Connecting hole; 15. Rubber sealing ring;

[0023] 2. Sealing structure;

[0024] 21. External sealing chamber; 22. Internal sealing element; 23. Rubber plug; 24. Through hole; 25. Sealing plug; 26. Fixing element; 27. Return spring; 28. Extrusion spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention; the term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] like Figure 1 and Figure 2 As shown, the device includes a daughter tube 1 and a corresponding mother tube 11. A sealing structure 2 is sheathed externally at the junction of the daughter tube 1 and mother tube 11. This sealing structure 2 consists of an external sealing chamber 21 and an internal sealing member 22. The internal sealing member 22 is in close contact with the daughter tube 1 and mother tube 11 via multiple sets of evenly distributed rubber plugs 23. The external sealing chamber 21 is sheathed externally of the internal sealing member 22. The internal sealing member 22 is designed with a through hole 24 that connects the internal sealing member 22 and the external sealing chamber 21. A sealing plug 25 is movably connected within the through hole 24.

[0029] In this embodiment, the utility model relates to the technical field of low-pressure bypass valve sealing, and a sealing effect is achieved by setting a sealing structure 2 that is sleeved on the outside of the sub-pipe 1 and the main pipe 11. The sealing structure directly contacts the connection of the pipe body with an internal seal 22. After the temperature and pressure rise, the liquid will inevitably overflow and enter the internal seal 11. As the liquid pressure gradually increases, it will break through the seal of the closest sealing plug 23 and enter the interior of the cavity. As the amount of liquid gradually increases, the sealing plug 25 will be pushed up, and a high-density gas such as nitrogen or other liquid will be filled into the external sealed cabin 21 to increase the pressure in the external sealed cabin 21, thereby achieving a dynamic balance between the external sealed cabin 21 and the internal seal 22. By releasing a portion of the liquid, the pressure in the bypass valve is relieved and high pressure is avoided. At the same time, the gas or liquid that rushes in can also have a cooling effect.

[0030] like Figure 3 and Figure 4 As shown, the external sealed cabin 21 is composed of a pair of outer shells 12 connected to each other. The ends of the outer shells 12 that are away from each other are each provided with a sealing cover 13. The outer shells 12 and the outer shells 12 and the sealing covers 13 are connected by threads. The sealing covers 13 are provided with a connecting hole 14, which is used to connect to the external boosting equipment. The sealing covers 13 are respectively penetrated by the sub-tube 1 and the main tube 11 and are sealed. In addition, a fixing part 26 is provided inside the internal seal 22. The fixing part 26 corresponds to the sub-tube 1 and the main tube 11 and is clamped on both sides of the rubber plug 23. The fixing part 26 and the rubber plug 23 are located on both sides of the through hole 24 to form a cavity. Reset springs 27 are also provided in the through hole 24. These springs are placed in the side walls of the through hole 24. Extrusion springs 28 are provided on both sides of the through hole 24. These extrusion springs 28 are placed inside the internal seal 22 and are fixedly connected to the rubber plug 23.

[0031] In this embodiment, the external pressurizing device connected to connection hole 14 includes, but is not limited to, an air pump or a water pump. A circulating pump can also be connected as needed to achieve a circulating cooling effect, or a pressure detection instrument can be connected to reflect the internal pressure of the bypass valve through the internal pressure effect of the external sealed cabin 21. This design not only enhances the sealing effect but also provides a dynamic pressure balancing mechanism that can effectively manage and adjust the pressure of the low-pressure bypass valve under different operating conditions, ensuring the safe and stable operation of the system.

[0032] When in use, first, connect the sub-tube 1 and the main tube 11, and ensure that the external sealing structure 2 is correctly sleeved on their connection, wherein the sealing structure 2 is composed of an external sealing chamber 21 and an internal sealing member 22. The internal sealing member 22 is in close contact with the sub-tube 1 and the main tube 11 through evenly distributed rubber plugs 23, and the external sealing chamber 21 is sleeved on the outside of the internal sealing member 22; then, check whether the through hole 24 on the internal sealing member 22 is connected to the internal sealing member 22 and the external sealing chamber 21, and ensure that the sealing plug 25 can be movably connected in the through hole 24; during system operation, as the temperature and pressure increase, the liquid will overflow into the internal sealing member 22. When the liquid pressure increases to a certain level, it will break through the sealing plug 23 and enter the air. Inside the cavity, the increase in the amount of liquid will push up the sealing plug 25. At this time, high-density gas such as nitrogen or other liquids is filled into the external sealed cabin 21 to increase the pressure inside the external sealed cabin 21, thereby achieving a dynamic balance between the external sealed cabin 21 and the internal seal 22. The pressure in the bypass valve is relieved by releasing part of the liquid to avoid high pressure, and the injected gas or liquid is used to achieve a cooling effect. In addition, an external boosting device, such as an air pump or a water pump, is connected through the connecting hole 14, and a circulating pump is connected as needed to achieve circulating cooling, or a pressure detection instrument is connected to monitor the internal pressure of the bypass valve through the internal pressure change of the external sealed cabin 21, thereby managing and adjusting the pressure of the low-pressure bypass valve under different working conditions to ensure the safe and stable operation of the system.

[0033] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A low-pressure bypass valve sealing device, comprising a sub-pipe (1) and a main pipe (11) corresponding to the sub-pipe (1), characterized in that: A sealing structure (2) is provided on the outside of the connection between the sub-tube (1) and the main tube (11), and the sealing structure (2) includes an external sealing cabin (21) and an internal sealing member (22); The internal sealing member (22) is tightly attached to the sub-tube (1) and the main tube (11) through a plurality of groups of evenly distributed rubber plugs (23), and the external sealing chamber (21) is sleeved on the outside of the internal sealing member (22); the internal sealing member (22) is provided with a through hole (24) penetrating the internal sealing member; The through hole (24) communicates with the internal sealing component (22) and the external sealing chamber (21), and a sealing plug (25) is movably connected in the through hole (24).

2. A low-pressure bypass valve sealing device according to claim 1, characterized in that: The external sealed cabin (21) includes a pair of outer shells (12) connected to each other. The ends of the outer shells (12) away from each other are each provided with a sealing cover (13). The outer shells (12) and the outer shells (12) and the sealing cover (13) are connected by threads.

3. A low-pressure bypass valve sealing device according to claim 2, characterized in that: The sealing cover (13) is provided with a connecting hole (14) penetrating the sealing cover, and the connecting hole (14) is connected to an external pressurizing device. The sealing cover (13) is penetrated by the sub-tube (1) and the main tube (11) and sealed.

4. A low-pressure bypass valve sealing device according to claim 1, characterized in that: The inner sealing member (22) is provided with fixing members (26) corresponding to the sub-tube (1) and the main tube (11) and clamped on both sides of the rubber plug (23). The fixing member (26) and the rubber plug (23) are located on both sides of the through hole (24). The rubber plug (23) and the fixing member (26) form a cavity.

5. The low-pressure bypass valve sealing device according to claim 1, characterized in that: A plurality of evenly distributed return springs (27) correspondingly connected to the sealing plug (25) are provided in the through hole (24), the return springs (27) being placed in the side wall of the through hole (24), and extrusion springs (28) placed in the internal sealing member (22) and fixedly connected to the rubber plug (23) are provided on both sides of the through hole (24).

6. The low-pressure bypass valve sealing device according to claim 1, characterized in that: A corresponding rubber sealing ring (15) is sleeved on the connection between the sub-tube (1) and the main tube (11), and the rubber sealing ring (15) is located inside the internal sealing member (22).

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