Low-temperature gate valve

Abstract

The utility model relates to the technical field of gate valves, and discloses a low-temperature gate valve which comprises a valve body, liquid transmission pipes are fixedly connected to the two sides of the valve body, a buffer chamber is fixedly connected to the upper portion of the valve body, a valve plate is movably connected to the interior of the valve body in a sleeved mode, and a sealing plate is fixedly connected to the upper end of the buffer chamber. The outer portion of the upper end of the sealing plate is movably sleeved with a valve deck, the upper portion of the valve plate is fixedly connected with a threaded sleeve, the interior of the upper end of the threaded sleeve is in threaded connection with a threaded rod, the upper portion of the threaded rod is fixedly connected with a valve rod, and the upper portion of the valve deck is fixedly connected with a sealing sleeve. According to the low-temperature gate valve, lubricating oil is driven by the lubricating oil conveying pipe to be conveyed into the sealing sleeve, meanwhile, the spiral groove is spiral, the circulation performance of the lubricating oil between the sealing sleeve and the valve rod is improved, the backflow pipe is arranged outside the sealing sleeve, the backflow pipe improves the lubricating oil to form a backflow space, and then the lubricating effect of the valve rod is improved.

Description

Technical Field

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

[0002] The opening and closing parts of the low-temperature gate valve are gates. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form a wedge. The wedge angle varies with the valve parameters, usually 50, and 2° when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce a slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing process. This gate is called an elastic gate.

[0003] Among the publicly authorized patents, a Chinese patent with the patent number "CN201420362964.6" discloses a low-temperature gate valve; the packing automatic compensation device is composed of a butterfly spring installed between the packing gland and the packing pressure plate; an annular groove is formed in the center of the end surface of the wedge-shaped gate plate, and a pressure relief hole connecting the annular groove and the inlet channel of the valve body is formed on the gate plate. It has the advantages of reliable sealing performance and good safety, and is suitable for low-temperature medium working conditions;

[0004] When the above-mentioned gate valve is used, in order to improve the rotation efficiency of the valve stem, lubricating oil is filled on the outside of the valve stem. The lubricating oil reduces the friction resistance of the valve stem, thereby facilitating the control of the rotation of the valve stem. However, when the lubricating oil is used, in order to ensure the sealing of the equipment, the gap between the valve stem and the valve cover will be small, and the small gap will affect the fluidity of the lubricating oil. When the lubricating oil cannot evenly cover the outside of the valve stem, it will affect the rotation efficiency of the valve stem. For this reason, we propose a low-temperature gate valve. Utility Model Content

[0005] In view of the shortcomings of the existing cryogenic gate valves, the utility model provides a cryogenic gate valve, which has a spiral groove on the inner side of the sealing sleeve, and the spiral groove drives the lubricating oil to perform spiral motion. At the same time, the spiral groove drives the lubricating oil to evenly cover the outside of the valve stem, thereby improving the uniformity of the lubricating oil coating. The reflux pipe drives the lubricating oil to form a reflux space, thereby improving the utilization rate of the lubricating oil, and solves the problems raised in the above-mentioned background technology.

[0006] The utility model provides the following technical solutions: a low-temperature gate valve comprises a valve body, two sides of the valve body are fixedly connected with liquid transmission pipes, the upper part of the valve body is fixedly connected with a buffer chamber, the inner part of the valve body is movably sleeved with a valve plate, the upper end of the buffer chamber is fixedly connected with a sealing plate, the outer part of the upper end of the sealing plate is movably sleeved with a valve cover, the upper part of the valve plate is fixedly connected with a threaded sleeve, the internal thread of the upper end of the threaded sleeve is connected with a threaded rod, the upper part of the threaded rod is fixedly connected with a valve stem, the upper part of the valve cover is fixedly connected with a sealing sleeve, the inside of the valve cover is fixedly connected with an inner sealing plate, a lubricating oil delivery pipe is installed on one side of the outer side of the sealing sleeve, a reflux pipe is fixedly connected to the side of the sealing sleeve, a spiral groove is opened inside the sealing sleeve, the upper end of the sealing sleeve is movably sleeved with an upper sealing cover, the upper end of the upper sealing cover is installed with a rotating sleeve, and the upper part of the rotating sleeve is fixedly connected with a rotating wheel.

[0007] Preferably, the valve plate is rhombus-shaped, and two sides of the valve plate are fitted inside the liquid transmission pipe.

[0008] Preferably, a limit plate is installed inside the buffer chamber, and the limit plate is attached to the outside of the valve plate.

[0009] Preferably, the sealing plate is installed between the buffer chamber and the valve cover, and fastening bolts are installed between the connection between the buffer chamber, the sealing plate and the valve cover.

[0010] Preferably, the threaded sleeve passes through the sealing plate, and the connection between the threaded rod and the valve stem is movably sleeved inside the inner sealing plate, and a sealing gasket is placed inside the chamber formed between the valve cover and the inner sealing plate.

[0011] Preferably, both ends of the return pipe are interconnected with the interior of the sealing sleeve, a lubricant circulation chamber is provided at the upper end of the sealing sleeve, both ends of the spiral groove are respectively interconnected with the return pipe, and the spiral groove is spiral-shaped.

[0012] Preferably, a diamond column is installed on the inner side of the rotating wheel, and the diamond column is movably sleeved inside the valve stem, and a fastening bolt is installed between the connection between the upper sealing cover and the sealing sleeve.

[0013] Compared with the existing low-temperature gate valve, the utility model has the following beneficial effects:

[0014] 1. The low-temperature gate valve drives the lubricating oil to be transported to the inside of the sealing sleeve through the lubricating oil delivery pipe. At the same time, the spiral groove is spiral, which improves the fluidity of the lubricating oil between the sealing sleeve and the valve stem. The return pipe is arranged outside the sealing sleeve. The return pipe increases the lubricating oil to form a reflux space, thereby improving the lubrication effect of the valve stem.

[0015] 2. The low-temperature gate valve passes through the inside of the sealing plate through the threaded sleeve, and the sealing plate is installed between the valve body and the valve cover. The sealing plate then seals the outside of the threaded sleeve. The valve stem is rotated, and the valve stem drives the threaded rod and the threaded sleeve to perform threaded movement. Then, the convenience of adjusting the height of the valve plate can be improved, and a sealing gasket is installed on the upper part of the sealing plate to improve the sealing performance of the equipment when it is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the main body of the utility model;

[0018] Figure 3 This is a schematic diagram of a partial cross-sectional structure of the utility model body lacking a valve plate;

[0019] Figure 4 This is a schematic diagram of the side cross-sectional structure of the main body of the utility model;

[0020] Figure 5 This is an enlarged structural diagram of point A of the utility model.

[0021] In the figure: 1. valve body; 2. liquid transmission pipe; 3. buffer chamber; 4. valve plate; 5. sealing plate; 6. valve cover; 7. inner sealing plate; 8. threaded sleeve; 9. threaded rod; 10. valve stem; 11. sealing sleeve; 12. lubricating oil delivery pipe; 13. return pipe; 14. spiral groove; 15. upper sealing cover; 16. rotating sleeve; 17. rotating wheel. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A low-temperature gate valve comprises a valve body 1, and liquid transmission pipes 2 are fixedly connected to both sides of the valve body 1, and the liquid transmission pipes 2 drive the liquid to circulate, and a buffer chamber 3 is fixedly connected to the upper part of the valve body 1, and the buffer chamber 3 performs buffering when driving the liquid to circulate, and a valve plate 4 is movably sleeved inside the valve body 1, and the valve plate 4 seals the inside of the valve body 1, and a sealing plate 5 is fixedly connected to the upper end of the buffer chamber 3, and the sealing plate 5 seals between the valve body 1 and the valve cover 6, and the valve cover 6 is movably sleeved on the outer end of the upper end of the sealing plate 5, and a threaded sleeve 8 is fixedly connected to the upper part of the valve plate 4, and a threaded rod 9 is internally threadedly connected to the upper end of the threaded sleeve 8, and a valve stem 10 is fixedly connected to the upper part of the threaded rod 9, and when the valve stem 10 rotates, the valve stem 10 drives the threaded rod 9 and the threaded sleeve 8 to perform threaded movement, and then the height of the valve plate 4 can be controlled for regulation, and the upper end of the valve cover 6 A sealing sleeve 11 is fixedly connected to the valve cover 6, an inner sealing plate 7 is fixedly connected to the inside of the valve cover 6, a sealing gasket is installed between the valve cover 6 and the inner sealing plate 7 to improve the sealing performance of the equipment when in use, a lubricating oil delivery pipe 12 is installed on one side of the outside of the sealing sleeve 11, the lubricating oil delivery pipe 12 drives the lubricating oil to be delivered to the inner side of the sealing sleeve 11, a reflux pipe 13 is fixedly connected to the side of the sealing sleeve 11, the reflux pipe 13 drives the lubricating oil to form a reflux space inside the sealing sleeve 11 to improve the utilization efficiency of the lubricating oil, a spiral groove 14 is opened inside the sealing sleeve 11, the spiral groove 14 improves the fluidity of the lubricating oil, an upper sealing cover 15 is movably sleeved on the upper end of the sealing sleeve 11, a rotating sleeve 16 is installed on the upper end of the upper sealing cover 15, a rotating wheel 17 is fixedly connected to the upper part of the rotating sleeve 16, the rotating wheel 17 is rotated, and the rotating wheel 17 drives the valve stem 10 to rotate.

[0024] See also Figure 2 The valve plate 4 is diamond-shaped, and both sides of the valve plate 4 are fitted inside the liquid transmission pipe 2. The valve plate 4 is installed on both sides of the valve body 1 through the liquid transmission pipe 2. At the same time, the liquid transmission pipe 2 drives the liquid to circulate, and the valve plate 4 is conical, and the side of the valve plate 4 is fitted inside the valve body 1. When the valve plate 4 moves upward, an opening is formed at the lower end of the valve body 1, and the opening can drive the liquid to circulate. At the same time, when the valve plate 4 moves downward, the valve plate 4 is blocked inside the valve body 1, and the valve plate 4 seals the inside of the valve body 1.

[0025] See also Figure 2 A limit plate is installed inside the buffer chamber 3, and the limit plate is attached to the outside of the valve plate 4. The limit plate is installed on the inner side of the buffer chamber 3, and the limit plate limits the moving trajectory of the valve plate 4 when it moves up and down. At the same time, the buffer chamber 3 is arranged at the upper end of the valve body 1. When the valve plate 4 moves upward, a cavity is formed inside the buffer chamber 3, which can drive the liquid transported inside the liquid transmission pipe 2 to be buffered, thereby avoiding the problem of excessively fast liquid circulation speed and affecting the liquid circulation efficiency.

[0026] See also Figure 2, the sealing plate 5 is installed between the buffer chamber 3 and the valve cover 6, and fastening bolts are installed between the connection of the buffer chamber 3, the sealing plate 5 and the valve cover 6. The sealing plate 5 is installed on the upper end of the buffer chamber 3, and the sealing plate 5 seals the buffer chamber 3 and the threaded sleeve 8, and the control valve cover 6 is arranged on the upper part of the sealing plate 5. The position between the buffer chamber 3, the sealing plate 5 and the valve cover 6 is spliced ​​and limited by the fastening bolts, thereby improving the sealing performance of the equipment when it is used.

[0027] See also Figure 5 , the threaded sleeve 8 passes through the sealing plate 5, and the threaded rod 9 and the valve stem 10 are movably sleeved inside the inner sealing plate 7 at the connection point. A sealing gasket is placed inside the chamber formed between the valve cover 6 and the inner sealing plate 7. A sealing gasket is installed between the valve cover 6 and the inner sealing plate 7. The sealing gasket can improve the sealing performance of the gate valve when it is used. At the same time, the threaded rod 9 and the valve stem 10 are sleeved inside the inner sealing plate 7 at the installation point. When the valve stem 10 rotates, the valve stem 10 drives the threaded rod 9 and the threaded sleeve 8 to perform threaded movement, and then the threaded rod 9 drives the threaded sleeve 8 to move up and down. The up and down movement of the threaded sleeve 8 can control the height of the valve plate 4 to adjust, and then control the sealing performance of the equipment when it is used.

[0028] See also Figure 3 , both ends of the return pipe 13 are interconnected with the interior of the sealing sleeve 11, and a lubricant circulation chamber is provided at the upper end of the sealing sleeve 11. Both ends of the spiral groove 14 are respectively interconnected with the return pipe 13. The spiral groove 14 is spiral, and lubricating oil is injected into the space between the valve stem 10 and the sealing sleeve 11 through the spiral groove 14. At the same time, the valve stem 10 is rotated to transmit the lubricant to the connection, thereby improving the convenience of the valve stem 10 when rotating. At the same time, the return pipe 13 is installed on both sides of the valve stem 10, and a spiral groove 14 is formed on the inner side of the sealing sleeve 11. When the valve stem 10 rotates, the lubricating oil can be driven to be evenly transmitted downward through the spiral groove 14, and when the sealing sleeve 11 rotates, the lubricating oil can be driven to be transmitted downward, and at the same time, it flows back to the upper end of the sealing sleeve 11 through the return pipe 13, thereby driving the fluidity of the lubricating oil.

[0029] See also Figure 2 A diamond column is installed on the inner side of the rotating wheel 17, and the diamond column is movably sleeved inside the valve stem 10. A fastening bolt is installed between the upper sealing cover 15 and the sealing sleeve 11. The upper sealing cover 15 is installed on the upper end of the sealing sleeve 11. At the same time, the upper sealing cover 15 drives the rotating wheel 17 and the valve stem 10 to be sleeved with each other. At the same time, after the upper sealing cover 15 is installed on the upper end of the sealing sleeve 11, the upper sealing cover 15 seals the upper part of the sealing sleeve 11 and rotates the rotating wheel 17. The rotating wheel 17 can synchronously drive the valve stem 10 to rotate.

[0030] Working principle: When in use, by rotating the rotating wheel 17, the rotating wheel 17 drives the valve stem 10 to rotate, and at the same time, the valve stem 10 drives the threaded rod 9 and the threaded sleeve 8 to perform threaded movement, thereby controlling the height of the valve plate 4 to be adjusted. When the valve plate 4 moves upward, the valve plate 4 can drive the inside of the valve body 1 to form an opening, and the opening can control the circulation of liquid, and a sealing gasket is installed inside the valve cover 6, which can seal between the valve cover 6 and the inner sealing plate 7. At the same time, the lubricating oil delivery pipe 12 drives the inside of the sealing sleeve 11 to apply lubricating oil, and at the same time, the spiral groove 14 assists in driving the lubricating oil to circulate downward, thereby improving the fluidity of the lubricating oil, and at the same time, the reflux pipe 13 drives the lubricating oil to reflux, thereby improving the utilization rate of the lubricating oil.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cryogenic gate valve, comprising a valve body (1), wherein both sides of the valve body (1) are fixedly connected to liquid transmission pipes (2), the upper part of the valve body (1) is fixedly connected to a buffer chamber (3), and the interior of the valve body (1) is movably sleeved with a valve plate (4), characterized in that: The upper end of the buffer chamber (3) is fixedly connected to a sealing plate (5), the upper end of the sealing plate (5) is movably sleeved with a valve cover (6), the upper part of the valve plate (4) is fixedly connected to a threaded sleeve (8), the upper end of the threaded sleeve (8) is internally threadedly connected to a threaded rod (9), the upper part of the threaded rod (9) is fixedly connected to a valve stem (10), the upper part of the valve cover (6) is fixedly connected to a sealing sleeve (11), and the interior of the valve cover (6) is fixedly connected to an inner sealing sleeve (12). A sealing plate (7), a lubricating oil delivery pipe (12) is installed on one side of the outside of the sealing sleeve (11), a return pipe (13) is fixedly connected to the side of the sealing sleeve (11), a spiral groove (14) is opened inside the sealing sleeve (11), an upper sealing cover (15) is movably sleeved on the upper end of the sealing sleeve (11), a rotating sleeve (16) is installed on the upper end of the upper sealing cover (15), and a rotating wheel (17) is fixedly connected to the upper part of the rotating sleeve (16).

2. A cryogenic gate valve according to claim 1, characterized in that: The valve plate (4) is in a rhombus shape, and two sides of the valve plate (4) are fitted inside the liquid transmission pipe (2).

3. A cryogenic gate valve according to claim 1, characterized in that: A limit plate is installed inside the buffer chamber (3), and the limit plate is attached to the outside of the valve plate (4).

4. A cryogenic gate valve according to claim 1, characterized in that: The sealing plate (5) is installed between the buffer chamber (3) and the valve cover (6), and fastening bolts are installed between the connection points of the buffer chamber (3), the sealing plate (5) and the valve cover (6).

5. A cryogenic gate valve according to claim 1, characterized in that: The threaded sleeve (8) passes through the sealing plate (5), and the threaded rod (9) and the valve stem (10) are movably sleeved inside the inner sealing plate (7) at the connection point. A sealing gasket is placed inside the chamber formed between the valve cover (6) and the inner sealing plate (7).

6. A cryogenic gate valve according to claim 1, characterized in that: Both ends of the return pipe (13) are interconnected with the interior of the sealing sleeve (11), and a lubricant circulation chamber is provided at the upper end of the sealing sleeve (11). Both ends of the spiral groove (14) are respectively interconnected with the return pipe (13), and the spiral groove (14) is spiral-shaped.

7. A cryogenic gate valve according to claim 1, characterized in that: A rhombus column is installed on the inner side of the rotating wheel (17), and the rhombus column is movably sleeved inside the valve stem (10). A fastening bolt is installed between the connection between the upper sealing cover (15) and the sealing sleeve (11).

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