Anti-freezing low temperature gate valve

Abstract

The application discloses an anti-freezing low-temperature gate valve, which comprises a valve body, connecting pipes, a valve cover, a sealing seat, connecting pipes are communicated with both sides of the valve body, the upper end of the valve body is fixedly installed with the valve cover through bolts, the upper end of the valve cover is fixedly installed with the sealing seat through bolts, and the gap between the sealing seat and the valve cover is filled with packing; the anti-freezing low-temperature gate valve further comprises a threaded rod, which is rotatably connected to the inner side of the sealing seat, the upper end of the threaded rod is fixedly connected with a knob through bolts, the lower end of the threaded rod is connected with a movable cylinder, and the lower end of the movable cylinder is fixedly installed with a gate plate; an elastic torsion spring is arranged on the inner side of the gate plate; and a liquid tank is fixedly installed on the inner wall of the connecting pipe. The anti-freezing low-temperature gate valve can store the elastic torsion spring by using the liquid flow when the valve is opened, and can generate heat and store heat by using the liquid flow, so that the liquid inside the valve body can be kept warm and stirred after the valve is closed, and the valve body is effectively prevented from freezing.

Description

Technical Field

[0001] This invention relates to the field of cryogenic gate valve technology, specifically to an antifreeze cryogenic gate valve. Background Technology

[0002] Gate valves are a common type of valve that opens and closes by moving a gate up and down. However, in actual use, when the outside temperature is low, the liquid inside the valve body is prone to freezing, which affects the valve body structure and makes it inconvenient to open the valve later.

[0003] For example, a cryogenic gate valve with publication number CN105697840B has a first pipeline for inputting antifreeze on the valve body on the high-pressure side. Antifreeze is input into the high-pressure chamber through the first pipeline, and the antifreeze thaws the cryogenic liquid in the high-pressure chamber. The thawed cryogenic liquid and antifreeze flow into the low-pressure chamber and then into the well. This ensures that the frozen cryogenic liquid will not hinder the opening of the cryogenic gate valve when it is opened, thus ensuring that the cryogenic gate valve can work normally in coalbed methane wells. However, it requires controlled delivery of antifreeze during use, which requires manual operation. In addition, the input antifreeze mixes with the transported fluid, which affects the normal use of the fluid, thus having certain defects in use.

[0004] Therefore, we propose a cryogenic gate valve to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a cryogenic gate valve that is resistant to freezing, in order to solve the problem mentioned in the background art that current gate valves on the market require manual operation and are inconvenient for automatic antifreezing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cryogenic gate valve for freezing protection, comprising a valve body, a connecting pipe, a valve cover, and a sealing seat. The connecting pipes are connected to both sides of the valve body, and the valve cover is fixedly installed on the upper end of the valve body by bolts. The sealing seat is fixedly installed on the upper end of the valve cover by bolts, and the gap between the sealing seat and the valve cover is filled with filler. The valve body also includes a threaded rod, rotatably connected to the inner side of the sealing seat. A knob is fixedly connected to the upper end of the threaded rod by bolts, and a movable cylinder is connected to the lower end of the threaded rod. A gate plate is fixedly installed on the lower end of the movable cylinder, and the gate plate has a hollow structure.

[0007] A partition is fixedly installed on the inner side of the gate, and a heat storage chamber is installed above the partition;

[0008] The impeller is rotatably connected to the inner side of the lower end of the gate.

[0009] A cover is fixedly installed on the inner wall of the gate. A first shaft is rotatably connected through the side wall of the cover, and a drive gear is fixedly connected to the outer side of the first shaft. The drive gear is located on the inner side of the cover.

[0010] An elastic torsion spring is installed on the inner side of the gate to achieve elastic rotation of the first shaft.

[0011] The second shaft is rotatably connected to the inner side of the gate plate. The second shaft passes through one side of the gate plate, and a transmission gear and an agitator are respectively installed at both ends of the second shaft.

[0012] The liquid bladder is fixedly installed on the inner wall of the connecting tube.

[0013] Preferably, the inner wall of the movable cylinder is provided with an internal thread structure, and the movable cylinder is threadedly connected to the threaded rod, and the gate plate fixedly installed at the lower end of the movable cylinder and the valve body form a lifting structure.

[0014] By adopting the above technical solution, rotating the knob can drive the threaded rod to rotate synchronously, so that the threaded rod is threadedly connected to the movable cylinder, thereby allowing the movable cylinder to drive the gate plate to rise and fall for adjustment, thus realizing the opening and closing of the gate valve.

[0015] Preferably, the impeller has blades arranged at equal angles on its outer side, with the lowest blade protruding from the lower end face of the gate plate, and the rotation axis of the impeller is perpendicular to the direction of liquid flow.

[0016] By adopting the above technical solution, when the gate plate moves up to open, the blades at the bottom of the impeller will be located in the valve body, so that a wear-resistant rubber sleeve is fixedly installed on the lower surface of the impeller, and the inner side of the wear-resistant rubber sleeve is filled with friction balls, and the wear-resistant rubber sleeve is positioned corresponding to the blades of the impeller.

[0017] By adopting the above technical solution, during the rotation of the impeller, its blades will intermittently contact and squeeze the rubber sleeve, causing the rubber sleeve to undergo elastic deformation, thereby causing the friction balls on its inner side to move and rub, thus generating a certain amount of frictional heat.

[0018] Preferably, the impeller shaft end is connected to the first shaft via a transmission bevel gear assembly, and the shaft of the transmission bevel gear assembly passes through the partition and is rotatably connected thereto. Furthermore, an elastic torsion spring is connected between the outer wall of the first shaft and the inner wall of the cover.

[0019] By adopting the above technical solution, when the impeller rotates under the action of liquid flow, it can drive the first shaft to rotate through the transmission bevel gear assembly, so that the elastic torsion spring can undergo elastic deformation under the drive of the first shaft to achieve energy storage.

[0020] Preferably, the heat storage chamber is filled with phase change heat storage material, and the heat storage chamber is attached to the outer wall of the cover and the partition. The heat storage chamber and the wear-resistant rubber sleeve are positioned vertically and vertically respectively, and the cover is made of thermally conductive metal.

[0021] By adopting the above technical solution, the heat generated by the deformation of the elastic torsion spring is transferred to the heat storage chamber through the cover. At the same time, the heat generated by friction in the wear-resistant rubber sleeve is also conducted to the heat storage chamber, thereby causing the heat storage material inside the heat storage chamber to absorb heat and undergo a phase change, which facilitates subsequent long-term heat preservation and achieves initial antifreeze.

[0022] Preferably, the drive gear is meshed with the transmission gear, and the number of teeth of the transmission gear is less than the number of teeth of the drive gear, and the agitator blade is arranged in a spiral structure.

[0023] By adopting the above technical solution, when the gate is closed, the first shaft can rotate elastically under the elastic force of the elastic torsion spring, so that the drive gear drives the second shaft to rotate synchronously through meshing with the transmission gear. At this time, the stirring blade at the end of the second shaft can stir the liquid inside the stirring blade to a certain extent, thereby effectively preventing the liquid from freezing.

[0024] Preferably, a fixed column is fixedly provided on the outer wall of the second shaft, and a fixed cylinder is fixedly installed on the upper surface of the partition. A movable column is provided on the inner side of the fixed cylinder. The movable column and the fixed cylinder form a lifting structure. An airbag is connected between the lower end of the movable column and the inner wall of the fixed cylinder. The movable column is outside the movement trajectory of the fixed column.

[0025] By adopting the above technical solution, when the internal temperature of the valve body is above freezing, the air bladder will push the movable column to extend and retract, so that the movable column moves to the movement trajectory of the fixed column, thereby blocking the fixed column and preventing the second shaft from continuing to rotate and wasting power, so that the agitation of the liquid can be automatically controlled.

[0026] Preferably, the liquid bladder is fixedly disposed on the inner wall of the connecting pipe at equal angles along the axis, and the outer side of the liquid bladder is connected to an inlet pipe and an outlet pipe, and the inlet pipe and outlet pipe are unidirectional flow structures with opposite flow directions, and the liquid bladder is made of elastic material.

[0027] By adopting the above technical solution, when the inner side of the valve body is initially frozen, the ice body will squeeze the liquid bladder, causing the liquid in the bladder to flow out, improving fluidity and achieving antifreeze.

[0028] Compared with the prior art, the beneficial effects of the present invention are: the antifreeze low temperature gate valve can use the liquid flow when the valve is opened to store the force of the elastic torsion spring, and at the same time, it can use the liquid flow to generate and store heat, thereby achieving the insulation and stirring of the liquid inside the valve body after the valve is closed, effectively preventing the inside of the valve body from freezing. The specific details are as follows.

[0029] 1. Equipped with an impeller, elastic torsion spring, and agitator blades, when the valve is opened, the gate moves upward. During this process, the liquid flows and impacts the impeller blades, causing the impeller to rotate automatically. This rotation drives the first shaft to rotate synchronously, causing the elastic torsion spring to deform and store energy. When the valve is closed, the second shaft rotates under the elastic force of the torsion spring, allowing the agitator blades to stir the liquid and keep it flowing, thus preventing freezing. The movable column can limit the second shaft when the temperature is relatively high, avoiding power waste.

[0030] 2. It is equipped with a cover, a wear-resistant rubber sleeve and a heat storage chamber. During the rotation of the impeller, it will intermittently squeeze the wear-resistant rubber sleeve, causing the friction balls on the inner side of the wear-resistant rubber sleeve to rub against each other and generate heat, thereby transferring the heat to the heat storage chamber. At the same time, the elastic torsion spring will generate a certain amount of heat when it deforms, and it will be transferred to the heat storage chamber through the cover. This allows the phase change material inside the heat storage chamber to undergo phase change and store heat, thereby keeping the liquid warm after the valve is closed and further achieving antifreeze.

[0031] 3. Equipped with a liquid bladder, inlet pipe, and outlet pipe, when the connecting pipe freezes, the increased volume of the ice will compress the liquid bladder, causing the water in the bladder to flow out, thereby further improving the fluidity of the liquid. This allows the relatively warmer liquid near the gate to flow towards the connecting pipe, thus achieving automatic freezing and further improving the antifreeze effect of the gate valve. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0034] Figure 3 This is a schematic diagram of the liquid bladder installation structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the three-dimensional structure of the liquid bladder of the present invention;

[0036] Figure 5 This is a side sectional three-dimensional structural diagram of the gate of the present invention;

[0037] Figure 6 This is a three-dimensional cross-sectional view of the heat storage chamber of the present invention;

[0038] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle;

[0039] Figure 8 This is a schematic diagram of the three-dimensional structure for mounting the elastic torsion spring of the present invention;

[0040] Figure 9 This is a schematic diagram of the cover mounting structure of the present invention;

[0041] Figure 10 This is a three-dimensional structural diagram of the second shaft and movable column of the present invention.

[0042] In the diagram: 1. Valve body; 2. Connecting pipe; 3. Valve cover; 4. Sealing seat; 5. Packing; 6. Threaded rod; 7. Knob; 8. Moving cylinder; 9. Gate; 10. Baffle plate; 11. Impeller; 12. Cover; 13. Wear-resistant rubber sleeve; 1301. Friction ball; 14. First shaft; 15. Transmission bevel gear assembly; 16. Heat storage chamber; 17. Drive gear; 18. Elastic torsion spring; 19. Second shaft; 20. Transmission gear; 21. Agitator blade; 22. Fixed column; 23. Fixed cylinder; 24. Moving column; 25. Air bladder; 26. Liquid bladder; 27. Inlet pipe; 28. Drain pipe. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please see Figure 1-10 The present invention provides a technical solution: a cryogenic gate valve for freezing protection, comprising a valve body 1, a connecting pipe 2, a valve cover 3, and a sealing seat 4. The two sides of the valve body 1 are connected to the connecting pipe 2, and the valve cover 3 is fixedly installed on the upper end of the valve body 1 by bolts. The sealing seat 4 is fixedly installed on the upper end of the valve cover 3 by bolts, and the gap between the sealing seat 4 and the valve cover 3 is filled with filler 5.

[0045] It also includes: a threaded rod 6, rotatably connected to the inner side of the sealing seat 4, with a knob 7 fixedly connected to the upper end of the threaded rod 6 by bolts, and a movable cylinder 8 connected to the lower end of the threaded rod 6, with a gate plate 9 fixedly installed at the lower end of the movable cylinder 8, and the gate plate 9 having a hollow structure; a partition plate 10, fixedly installed on the inner side of the gate plate 9, with a heat storage chamber 16 installed above the partition plate 10; an impeller 11, rotatably connected to the inner side of the lower end of the gate plate 9; and a cover 12, fixedly installed on the inner wall of the gate plate 9, with a first shaft 14 rotatably connected to the side wall of the cover 12, and the first shaft 14... A drive gear 17 is fixedly connected to the outer side of the cover 12, and the drive gear 17 is located inside the cover 12; an elastic torsion spring 18 is set inside the gate plate 9 to realize the elastic rotation of the first shaft 14; a second shaft 19 is rotatably connected to the inner side of the gate plate 9, the second shaft 19 passes through one side of the gate plate 9, and a transmission gear 20 and an agitator 21 are respectively installed at both ends of the second shaft 19; the inner wall of the movable cylinder 8 is provided with an internal thread structure, and the movable cylinder 8 is threadedly connected to the threaded rod 6, and the gate plate 9 fixedly set at the lower end of the movable cylinder 8 and the valve body 1 form a lifting structure. Blades are arranged at equal angles on the outer side of the impeller 11, and the lowermost blade protrudes from the lower end face of the gate plate 9, and the rotation axis of the impeller 11 is perpendicular to the liquid flow direction. The impeller 11 is connected to the first shaft 14 via a transmission bevel gear assembly 15. The shaft of the transmission bevel gear assembly 15 passes through the partition 10 and is rotatably connected to it. An elastic torsion spring 18 is connected between the outer wall of the first shaft 14 and the inner wall of the cover 12. The drive gear 17 meshes with the transmission gear 20, and the number of teeth of the transmission gear 20 is less than the number of teeth of the drive gear 17. The agitator blade 21 is arranged in a spiral structure. A fixed column 22 is fixedly installed on the outer wall of the second shaft 19, and a fixed cylinder 23 is fixedly installed on the upper surface of the partition 10. A movable column 24 is provided on the inner side of the fixed cylinder 23. The movable column 24 and the fixed cylinder 23 form a lifting structure. An air bladder 25 is connected between the lower end of the movable column 24 and the inner wall of the fixed cylinder 23. The movable column 24 is outside the movement trajectory of the fixed column 22. Figure 1-2 , Figure 5-6 and Figure 8-10As shown, rotating knob 7 drives threaded rod 6 to rotate synchronously, causing threaded rod 6 to move movable cylinder 8 upward through threaded connection. Movable cylinder 8 then moves gate 9 upward. At this time, the liquid flow impacts impeller 11, causing impeller 11 to rotate automatically. The shaft end of impeller 11 drives first shaft 14 to rotate through transmission bevel gear assembly 15, causing first shaft 14 to drive elastic torsion spring 18 to elastically deform and store force. When the valve is closed, gate 9 moves downward to reset, and impeller 11 is no longer affected by water flow. In this process, the first shaft 14 rotates elastically under the force of the elastic torsion spring 18, thereby causing the drive gear 17 to mesh with the transmission gear 20, which in turn drives the second shaft 19 to rotate synchronously. This allows the agitator 21 to agitate the liquid, improving its fluidity and effectively preventing freezing when the valve is closed for a long time. When the liquid temperature has not reached the freezing point, the air bag 25 pushes the movable column 24 upward, causing the movable column 24 to block the fixed column 22, thus preventing the agitator 21 from continuing to rotate and wasting power.

[0046] A wear-resistant rubber sleeve 13 is fixedly installed on the lower surface of the partition 10, and the inner side of the wear-resistant rubber sleeve 13 is filled with friction balls 1301. The wear-resistant rubber sleeve 13 is positioned corresponding to the blades of the impeller 11. The heat storage chamber 16 is filled with phase change heat storage material, and the heat storage chamber 16 is attached to the outer wall of the cover 12 and the partition 10. The positions of the heat storage chamber 16 and the wear-resistant rubber sleeve 13 are vertically corresponding. The cover 12 is made of thermally conductive metal material. Figure 5-7 As shown, when the impeller 11 rotates, it intermittently squeezes the wear-resistant rubber sleeve 13, causing the friction balls 1301 inside the wear-resistant rubber sleeve 13 to rub against each other, thereby generating heat. The heat generated is conducted to the heat storage chamber 16. At the same time, the heat generated during the elastic deformation of the elastic torsion spring 18 is also conducted to the heat storage chamber 16 through the cover 12, causing the material inside the heat storage chamber 16 to undergo phase change and store heat. This allows the liquid inside the valve body 1 to be kept warm after the valve is closed, further improving the antifreeze effect.

[0047] The liquid bladder 26 is fixedly installed on the inner wall of the connecting pipe 2. The liquid bladder 26 is axially and angularly fixed to the inner wall of the connecting pipe 2, and the outer side of the liquid bladder 26 is connected to an inlet pipe 27 and a drain pipe 28. The inlet pipe 27 and the drain pipe 28 are unidirectional flow structures with opposite flow directions. The liquid bladder 26 is made of an elastic material, such as... Figure 2-4 As shown, when the connecting pipe 2 freezes, the liquid bladder 26 will discharge the liquid inside through the drain pipe 28 under the pressure of the ice, thereby driving the relatively warm liquid near the gate 9 to flow to the connecting pipe 2 to thaw. When the ice melts, the liquid bladder 26 will inflate under its own elasticity, thereby drawing in liquid again through the water inlet pipe 27.

[0048] Working principle: When using this cryogenic gate valve, firstly, as follows... Figure 1-10 As shown, when the valve needs to be opened, the knob 7 is rotated, causing the gate 9 to move upward. At this time, the impeller 11 will rotate under the action of the liquid flow, which will cause the first shaft 14 to drive the elastic torsion spring 18 to deform and store force. At the same time, the impeller 11 will squeeze the wear-resistant rubber sleeve 13, so that the heat generated by the friction of the friction ball 1301 and the heat generated by the deformation of the elastic torsion spring 18 will heat the phase change material in the heat storage chamber 16. After the valve is closed, the stirring blade 21 will stir the liquid under the elastic force of the elastic torsion spring 18. The heat storage chamber 16 can keep the liquid inside the valve body 1 warm, thereby achieving effective antifreeze. The liquid bladder 26 can further increase the liquid flow under pressure, achieving antifreeze at the connecting pipe 2, thus completing a series of operations.

[0049] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cryogenic gate valve for freezing protection, comprising a valve body (1), a connecting pipe (2), a valve cover (3), and a sealing seat (4), wherein the valve body (1) is connected to both sides by the connecting pipe (2), and the valve cover (3) is fixedly installed on the upper end of the valve body (1) by bolts, and the sealing seat (4) is fixedly installed on the upper end of the valve cover (3) by bolts, and the gap between the sealing seat (4) and the valve cover (3) is filled with packing material (5); Its features are, Also includes: A threaded rod (6) is rotatably connected to the inner side of the sealing seat (4). The upper end of the threaded rod (6) is fixedly connected to a knob (7) by bolts, and the lower end of the threaded rod (6) is connected to a movable cylinder (8). A gate plate (9) is fixedly installed at the lower end of the movable cylinder (8). The gate plate (9) is a hollow structure. A partition (10) is fixedly installed on the inner side of the gate (9), and a heat storage chamber (16) is installed above the partition (10). The impeller (11) is rotatably connected to the inner side of the lower end of the gate (9); Cover (12) is fixedly installed on the inner wall of gate (9). The side wall of the cover (12) is rotatably connected to a first shaft (14), and a drive gear (17) is fixedly connected to the outer side of the first shaft (14), and the drive gear (17) is located on the inner side of the cover (12). An elastic torsion spring (18) is provided on the inner side of the gate plate (9) to realize the elastic rotation of the first shaft (14); The second shaft (19) is rotatably connected to the inner side of the gate (9). The second shaft (19) passes through one side of the gate (9), and the two ends of the second shaft (19) are respectively equipped with a transmission gear (20) and an agitator (21). The liquid bladder (26) is fixedly installed on the inner wall of the connecting tube (2).

2. The cryogenic gate valve for freezing protection according to claim 1, characterized in that: The inner wall of the movable cylinder (8) is provided with an internal thread structure, and the movable cylinder (8) is threadedly connected to the threaded rod (6). The gate plate (9) fixedly installed at the lower end of the movable cylinder (8) and the valve body (1) form a lifting structure.

3. The cryogenic gate valve for freezing protection according to claim 1, characterized in that: The impeller (11) has blades arranged at equal angles on its outer side, and the lowest blade protrudes from the lower end face of the gate (9). The rotation axis of the impeller (11) is perpendicular to the direction of liquid flow.

4. The cryogenic gate valve for freezing protection according to claim 1, characterized in that: A wear-resistant rubber sleeve (13) is fixedly provided on the lower surface of the partition (10), and the inner side of the wear-resistant rubber sleeve (13) is filled with friction balls (1301), and the wear-resistant rubber sleeve (13) is arranged in correspondence with the blade position of the impeller (11).

5. The cryogenic gate valve for freezing protection according to claim 1, characterized in that: The impeller (11) is connected to the first shaft (14) via a transmission bevel gear assembly (15), and the shaft of the transmission bevel gear assembly (15) passes through the partition (10) and is rotatably connected thereto. An elastic torsion spring (18) is connected between the outer wall of the first shaft (14) and the inner wall of the cover (12).

6. The cryogenic gate valve for freezing protection according to claim 4, characterized in that: The heat storage chamber (16) is filled with phase change heat storage material, and the heat storage chamber (16) is attached to the outer wall of the cover (12) and the partition (10). The heat storage chamber (16) and the wear-resistant rubber sleeve (13) are positioned vertically and vertically respectively, and the cover (12) is made of thermally conductive metal material.

7. The cryogenic gate valve for freezing protection according to claim 1, characterized in that: The drive gear (17) meshes with the transmission gear (20), and the number of teeth of the transmission gear (20) is less than the number of teeth of the drive gear (17), and the agitator (21) is arranged in a spiral structure.

8. The cryogenic gate valve for freezing protection according to claim 1, characterized in that: A fixed column (22) is fixedly installed on the outer wall of the second shaft (19), and a fixed cylinder (23) is fixedly installed on the upper surface of the partition (10). A movable column (24) is provided on the inner side of the fixed cylinder (23). The movable column (24) and the fixed cylinder (23) form a lifting structure. An airbag (25) is connected between the lower end of the movable column (24) and the inner wall of the fixed cylinder (23). The movable column (24) is outside the movement trajectory of the fixed column (22).

9. A cryogenic gate valve for freezing protection according to claim 1, characterized in that: The liquid bladder (26) is fixedly disposed on the inner wall of the connecting pipe (2) at equal angles along the axis, and the outer side of the liquid bladder (26) is connected to the water inlet pipe (27) and the drain pipe (28). The water inlet pipe (27) and the drain pipe (28) are unidirectional flow structures with opposite flow directions. The liquid bladder (26) is made of elastic material.

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