Low-temperature gate valve convenient to precool

Abstract

The invention discloses a low-temperature gate valve convenient to precool, and relates to the technical field of low-temperature gate valves. The valve comprises a valve body and a valve rod rotating in the valve body, a heat preservation sleeve is fixedly connected to the periphery of the valve body, the valve rod rotationally penetrates through the top of the heat preservation sleeve, a communicated air inlet pipe is fixedly connected between the two sides of the top of the heat preservation sleeve, and a communicated exhaust pipe is fixedly connected to the bottom of the heat preservation sleeve. Control valves are mounted at one ends of the air inlet pipe and the exhaust pipe; the air inlet pipe is connected with a liquid nitrogen output pipeline; and an anti-opening mechanism. Before the valve body is opened, the valve body can be conveniently pre-cooled, thermal stress damage caused by sudden temperature change is prevented, meanwhile, when the valve rod is frozen or rusted and clamped, the handle can idle, damage to the valve rod and the gate plate is avoided, the use safety is improved, and before pre-cooling, a positioning ring on the valve rod is clamped through a limiting frame, so that the valve rod is prevented from being damaged. And the valve rod is prevented from being rotated, the valve body is prevented from being opened without precooling, and the use safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cryogenic gate valves, and particularly relates to a cryogenic gate valve facilitating precooling. Background Art

[0002] A cryogenic gate valve is a cut-off valve specifically used for extremely low-temperature media (usually below -40°C), mainly applied to the conveying systems of ultra-low-temperature fluids such as liquefied natural gas (LNG), liquid oxygen, and liquid nitrogen. Such valves need to pass the low-temperature performance test at -196°C, have excellent cold insulation and safety performance, and are key control devices in cryogenic storage and transportation devices, widely used in fields such as energy, chemical industry, and aerospace.

[0003] When the existing cryogenic gate valve is opened, it usually needs to be precooled to avoid damage to the valve body caused by temperature difference. However, when the existing cryogenic gate valve is in use, it is not convenient to precool it. At the same time, it directly opens the gate plate through a handle, electric or pneumatic means. When the gate plate and the valve stem are abnormal, it is forcibly opened, and the equipment is prone to damage. Therefore, a cryogenic gate valve facilitating precooling is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a cryogenic gate valve facilitating precooling, which can facilitate the precooling of the valve body before the valve body is opened, prevent damage caused by thermal stress due to sudden temperature change. At the same time, when the valve stem is frozen or rusted and stuck, the handle can rotate idly, avoiding damage to the valve stem and the gate plate, improving the safety of use. And before precooling, the positioning ring on the valve stem is clamped by the limit frame to prevent the valve stem from rotating, avoiding the valve body being opened without precooling, improving the safety of use, and solving the existing technical problems.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] A cryogenic gate valve facilitating precooling, comprising: a valve body and a valve stem rotatably arranged in the valve body. A heat preservation sleeve is fixedly connected around the valve body. The valve stem rotatably penetrates through the top of the heat preservation sleeve. A communicating intake pipe is fixedly connected between the two sides at the top of the heat preservation sleeve. The bottom of the heat preservation sleeve is fixedly connected with a communicating exhaust pipe. Control valves are installed at one ends of the intake pipe and the exhaust pipe respectively. The intake pipe is used to connect the liquid nitrogen output pipeline. By setting the heat preservation sleeve fixedly on the valve body and installing the intake pipe and the exhaust pipe on the heat preservation sleeve, it can facilitate the precooling of the valve body before the valve body is opened, preventing damage caused by thermal stress due to sudden temperature change;

[0007] An anti-opening mechanism, which is arranged between the heat preservation sleeve and the valve stem for controlling the valve stem;

[0008] A driving mechanism, which is arranged at the top of the valve stem for driving the valve stem to rotate.

[0009] As a further solution of the present invention, the anti-opening mechanism includes a liquid storage tank and a positioning ring. The liquid storage tank is fixed to the inner wall of the top of the heat preservation sleeve. Water is provided in the liquid storage tank. A sliding plate is slidably connected in the liquid storage tank. The bottom of the sliding plate contacts the water surface. Two first springs are fixedly connected to the surface of the sliding plate. The top of the first spring abuts against the inner wall of the top of the heat preservation sleeve. A limiting frame is fixedly connected to the surface of the sliding plate. The positioning ring is fixed to the circumference of the valve stem. A plurality of positioning grooves for cooperating with the limiting frame are formed on the surface of the positioning ring. By the cooperation of the limiting frame and the positioning ring, before pre-cooling, the positioning ring on the valve stem is clamped by the limiting frame, preventing the valve stem from being rotated, avoiding the valve body from being opened without pre-cooling, and improving the safety of use.

[0010] As a further solution of the present invention, a plurality of heat conducting fins are fixedly connected to the outer wall of the liquid storage tank.

[0011] As a further solution of the present invention, the driving mechanism includes a fixed disk. The fixed disk is fixed to the circumference of the valve stem. A plurality of first driving grooves are formed on the circumference of the fixed disk. An inner ring is rotatably connected to the circumference of the fixed disk. A plurality of mounting cylinders are fixedly connected to the circumference of the inner ring. An outer ring is fixedly connected between the plurality of mounting cylinders. Sliders are slidably connected in the mounting cylinders respectively. Second driving grooves are formed at the ends of the sliders close to the inner ring. Driving columns are arranged in the second driving grooves respectively. Push plates are slidably connected in the mounting cylinders respectively. Second springs are fixedly connected between the push plates and the adjacent sliders respectively. Through the setting of the driving mechanism, when opening the gate plate, when the valve stem is frozen or rusted and jammed, the handle can rotate idly, avoiding damage to the valve stem and the gate plate, and improving the safety of use.

[0012] As a further solution of the present invention, push rods are fixedly connected to the sides of the push plates away from the second springs respectively. The push rods all slidably penetrate through the outer ring. An adjusting ring is rotatably connected to the circumference of the outer ring. Inclined first support rods are rotatably connected between the push rods and the inner wall of the adjusting ring respectively. Through the setting of the adjusting ring, when rotating the worm, the thrust of the second spring on the slider can be changed, and the driving torque can be changed, improving the flexibility of use.

[0013] As a further solution of the present invention, a fixing frame is fixedly connected between the bottoms of the inner ring and the outer ring. A mounting shaft is rotatably connected to the bottom of the fixing frame. A worm gear is fixedly connected to the bottom of the mounting shaft. A worm is rotatably connected to the bottom of the fixing frame. The worm is meshed with the worm gear. A mounting column is fixedly connected to the surface of the worm gear. An inclined second support rod is rotatably connected between the mounting column and the bottom of the adjusting ring.

[0014] As a further solution of the present invention, a plurality of scale lines are arranged on the surface of the outer ring. A pointer for cooperating with the scale lines is fixed on the surface of the adjusting ring.

[0015] As a further solution of the present invention, a ring-shaped handle is fixed to the top of the outer ring.

[0016] The embodiments of the present invention have the following beneficial effects:

[0017] In the present invention, through the setting of fixing the heat preservation sleeve on the valve body, the air inlet pipe and the exhaust pipe are installed on the heat preservation sleeve, so that before the valve body is opened, it is convenient to pre-cool the valve body, preventing thermal stress damage caused by sudden temperature change.

[0018] In the present invention, through the combined use of the limit frame and the positioning ring, before pre-cooling, the positioning ring on the valve stem is clamped by the limit frame, preventing the valve stem from rotating, avoiding the valve body from being opened without pre-cooling, and improving the safety of use.

[0019] In the present invention, through the setting of the driving mechanism, when the gate plate is opened, when the valve stem is frozen or rusted and jammed, the handle can rotate idly, avoiding damage to the valve stem and the gate plate, and improving the safety of use.

[0020] In the present invention, through the setting of the adjusting ring, when the worm is rotated, the thrust of the second spring on the slider can be changed, and the driving torque can be changed, improving the flexibility of use.

[0021] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0023] Figure 1 It is a three-dimensional structure schematic diagram of an embodiment of the present invention;

[0024] Figure 2 It is a sectional structure schematic diagram of an embodiment of the present invention;

[0025] Figure 3 It is an embodiment of the present invention Figure 2 The enlarged structure schematic diagram of point A;

[0026] Figure 4 It is a partial sectional structure schematic diagram of an embodiment of the present invention;

[0027] Figure 5 It is an embodiment of the present invention Figure 4 The enlarged structure schematic diagram of point B.

[0028] In the figure: 1, valve body; 2, heat preservation sleeve; 3, intake pipe; 4, exhaust pipe; 5, control valve; 6, valve stem; 7, liquid storage tank; 8, heat conducting fin; 9, sliding plate; 10, first spring; 11, limit frame; 12, positioning ring; 13, positioning groove; 14, fixed plate; 15, first drive groove; 16, installation cylinder; 17, adjusting ring; 18, slider; 19, second drive groove; 191, drive column; 20, push plate; 21, second spring; 22, push rod; 23, first support rod; 24, fixed frame; 25, outer ring; 26, handle; 27, worm; 28, installation shaft; 29, worm gear; 30, installation column; 31, second support rod; 32, scale line; 33, inner ring. Specific embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, 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 invention.

[0030] In the description of the present invention, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc. indicating orientation or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0031] In order to keep the following description of the embodiments of the present invention clear and concise, the detailed descriptions of known functions and known components are omitted in the present invention.

[0032] Embodiment 1

[0033] Please refer to Figures 1 - 5 As shown, in this embodiment, a cryogenic gate valve convenient for precooling is provided, including: a valve body 1 and a valve stem 6 rotatably arranged in the valve body 1. A gate plate is slidably arranged in the valve body 1. The valve stem 6 is threadedly connected to the gate plate. By rotating the valve stem 6, the gate plate can be driven to move, thereby controlling the opening and closing of the pipeline. A heat preservation sleeve 2 is fixedly connected to the periphery of the valve body 1. The valve stem 6 rotatably penetrates through the top of the heat preservation sleeve 2. A communicating intake pipe 3 is fixedly connected between the two sides of the top of the heat preservation sleeve 2. The bottom of the heat preservation sleeve 2 is fixedly connected with a communicating exhaust pipe 4. Control valves 5 are installed at one ends of the intake pipe 3 and the exhaust pipe 4. The intake pipe 3 is used to connect the liquid nitrogen output pipeline. Through the intake pipe 3, liquid nitrogen can be conveniently injected into the heat preservation sleeve 2, and then the valve body 1 is precooled to prevent thermal stress damage caused by sudden temperature change when opening the valve;

[0034] An anti-opening mechanism, which is arranged between the heat preservation sleeve 2 and the valve stem 6 for controlling the valve stem 6;

[0035] A driving mechanism is arranged at the top of the valve stem 6 and is used to drive the valve stem 6 to rotate.

[0036] In the present invention, the anti-opening mechanism includes a liquid storage tank 7 and a positioning ring 12. The liquid storage tank 7 is fixed to the inner wall of the top of the heat preservation sleeve 2. Water is provided in the liquid storage tank 7. A sliding plate 9 is slidably connected in the liquid storage tank 7. The bottom of the sliding plate 9 contacts the water surface. Two first springs 10 are fixedly connected to the surface of the sliding plate 9. The top of the first springs 10 abuts against the inner wall of the top of the heat preservation sleeve 2. A limiting frame 11 is fixedly connected to the surface of the sliding plate 9. The positioning ring 12 is fixed to the circumference of the valve stem 6. A plurality of positioning grooves 13 for cooperating with the limiting frame 11 are formed on the surface of the positioning ring 12. The rotation of the valve stem 6 can be restricted by the limiting frame 11. After liquid nitrogen enters the heat preservation sleeve 2, the water in the liquid storage tank 7 will freeze. The volume of the frozen water increases, and then the limiting frame 11 is pushed upward, so that the limiting frame 11 disengages from the positioning groove 13, and then the valve stem 6 can rotate.

[0037] Particularly, a plurality of heat conducting fins 8 are fixedly connected to the outer wall of the liquid storage tank 7, and the heat conducting fins 8 can increase the temperature conduction speed.

[0038] It should be noted that the driving mechanism includes a fixed disk 14. The fixed disk 14 is fixed to the circumference of the valve stem 6. A plurality of first driving grooves 15 are formed on the circumference of the fixed disk 14. An inner ring 33 is rotatably connected to the circumference of the fixed disk 14. A plurality of mounting cylinders 16 are fixedly connected to the circumference of the inner ring 33. An outer ring 25 is fixedly connected between the plurality of mounting cylinders 16. Sliders 18 are slidably connected in the mounting cylinders 16. Second driving grooves 19 are formed at one ends of the sliders 18 close to the inner ring 33. Driving columns 191 are arranged in the second driving grooves 19. Push plates 20 are slidably connected in the mounting cylinders 16. Second springs 21 are fixedly connected between the push plates 20 and the adjacent sliders 18. The driving column 191 abuts against one of the first driving grooves 15, and then drives the fixed disk 14 to rotate by using frictional resistance, and then drives the valve stem 6 to rotate through the fixed disk 14. When the valve stem 6 freezes or gets stuck due to rust, the excessive frictional resistance pushes the driving column 191 and the slider 18 to retract into the mounting cylinder 16, and then an idle rotation occurs, avoiding damage to the valve stem 6 and the gate plate and improving the safety of use.

[0039] Embodiment 2

[0040] Based on Embodiment 1 for improvement: Refer to the attached Figures 1 - 5 :

[0041] In the present invention, push rods 22 are fixedly connected to the sides of the push plate 20 away from the second spring 21. The push rods 22 all slide through the outer ring 25. An adjusting ring 17 is rotatably connected to the circumference of the outer ring 25. Inclined first support rods 23 are rotatably connected between the push rods 22 and the inner wall of the adjusting ring 17. When the adjusting ring 17 rotates, the push rods 22 are pushed to move through the first support rods 23, and the push rods 22 drive the push plate 20 to move, thereby being able to change the thrust of the second spring 21 on the slider 18 and change the driving torque, improving the flexibility of use.

[0042] In particular, a fixing frame 24 is fixedly connected between the bottoms of the inner ring 33 and the outer ring 25. A mounting shaft 28 is rotatably connected to the bottom of the fixing frame 24. A worm gear 29 is fixedly connected to the bottom of the mounting shaft 28. A worm 27 is rotatably connected to the bottom of the fixing frame 24. The worm 27 meshes with the worm gear 29. A mounting post 30 is fixedly connected to the surface of the worm gear 29. An inclined second support rod 31 is rotatably connected between the mounting post 30 and the bottom of the adjusting ring 17. When the worm 27 is moved, the worm gear 29 can be driven to rotate, and the worm gear 29 drives the adjusting ring 17 to rotate through the second support rod 31.

[0043] It should be noted that a plurality of scale lines 32 are provided on the surface of the outer ring 25, and a pointer for cooperating with the scale lines 32 is fixed on the surface of the adjusting ring 17. Through the scale lines 32, people can conveniently observe the adjustment position of the adjusting ring 17.

[0044] In the present invention, an annular handle 26 is fixed to the top of the outer ring 25, and the handle 26 facilitates people's operation.

[0045] The use process and working principle of the technical solution of the present invention are as follows:

[0046] In the present invention, when the valve body 1 needs to be opened after a long time of non-use, first, liquid nitrogen is slowly injected into the heat preservation sleeve 2 through the air inlet pipe 3, and then the valve body 1 is pre-cooled to prevent thermal stress damage caused by sudden temperature change. Before pre-cooling, the positioning ring 12 on the valve rod 6 is clamped by the limiting frame 11 to prevent the valve rod 6 from being rotated and avoid the valve body 1 being opened without pre-cooling, improving the safety of use. When the liquid nitrogen enters the inside of the heat preservation sleeve 2, the water in the liquid storage tank 7 will be frozen. After freezing, the volume of the water increases, and then the limiting frame 11 is pushed upward, so that the limiting frame 11 is disengaged from the positioning groove 13, and then the valve rod 6 can be rotated;

[0047] When driving the valve stem 6, rotate the handle 26. The handle 26 drives the outer ring 25 to rotate. The outer ring 25 drives the mounting cylinder 16 to rotate. The mounting cylinder 16 drives the slider 18 to rotate. The slider 18, under the supporting action of the second spring 21, pushes the driving column 191 to abut against one of the first driving grooves 15, and then drives the fixed disk 14 to rotate by using the frictional resistance. Then, the valve stem 6 is driven to rotate by the fixed disk 14. When the valve stem 6 is frozen or rusted and jammed, the excessive frictional resistance pushes the driving column 191 and the slider 18 to retract into the mounting cylinder 16, and then an idle rotation occurs, avoiding damage to the valve stem 6 and the gate plate and improving the safety of use;

[0048] When rotating the worm 27, it can drive the worm wheel 29 to rotate. The worm wheel 29 drives the adjusting ring 17 to rotate through the second support rod 31. The adjusting ring 17 pushes the push rod 22 to move through the first support rod 23. The push rod 22 drives the push plate 20 to move, and then the thrust of the second spring 21 on the slider 18 can be changed, and the driving torque can be changed, improving the flexibility of use.

[0049] It should be noted that in the description of this specification, the descriptions such as "first", "second", etc. are only used to distinguish each feature, and do not have an actual order or directional meaning. This application is not limited thereto.

[0050] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A cryogenic gate valve that is convenient for precooling, characterized in that: include: A valve body (1) and a valve stem (6) rotating in the valve body (1); the valve body (1) is fixedly connected with a heat preservation sleeve (2) around its periphery; the valve stem (6) rotates and penetrates the top of the heat preservation sleeve (2); a connected air intake pipe (3) is fixedly connected between two sides of the top of the heat preservation sleeve (2); a connected exhaust pipe (4) is fixedly connected to the bottom of the heat preservation sleeve (2); a control valve (5) is installed at one end of each of the air intake pipe (3) and the exhaust pipe (4); the air intake pipe (3) is used to connect to a liquid nitrogen output pipeline; An anti-opening mechanism, the anti-opening mechanism being arranged between the thermal insulation sleeve (2) and the valve stem (6) and being used for controlling the valve stem (6); A driving mechanism is arranged on the top of the valve stem (6) and is used to drive the valve stem (6) to rotate.

2. A cryogenic gate valve for precooling as claimed in claim 1, characterized in that: The anti-opening mechanism comprises a liquid storage tank (7) and a positioning ring (12). The liquid storage tank (7) is fixed to the top inner wall of the thermal insulation sleeve (2). Water is arranged in the liquid storage tank (7). A slide plate (9) is slidably connected to the liquid storage tank (7). The bottom of the slide plate (9) contacts the water surface. Two first springs (10) are fixedly connected to the surface of the slide plate (9). The top of the first spring (10) contacts the top inner wall of the thermal insulation sleeve (2). The surface of the slide plate (9) is fixedly connected to a limiting frame (11). The positioning ring (12) is fixed to the circumference of the valve stem (6). The surface of the positioning ring (12) is provided with a plurality of positioning grooves (13) used in conjunction with the limiting frame (11).

3. A cryogenic gate valve that facilitates precooling as claimed in claim 2, characterized in that: A plurality of heat-conducting fins (8) are fixedly connected to the outer wall of the liquid storage tank (7).

4. A cryogenic gate valve for precooling as claimed in claim 1, characterized in that: The driving mechanism comprises a fixed disk (14), wherein the fixed disk (14) is fixed on the circumference of the valve stem (6), and a plurality of first driving grooves (15) are provided on the circumference of the fixed disk (14); the circumference of the fixed disk (14) is rotatably connected to an inner ring (33), and a plurality of mounting tubes (16) are fixedly connected to the circumference of the inner ring (33); an outer ring (25) is fixedly connected between the plurality of mounting tubes (16); a slider (18) is slidably connected inside the mounting tubes (16), and a second driving groove (19) is provided at one end of the slider (18) close to the inner ring (33); a driving column (191) is provided in the second driving groove (19); a push plate (20) is slidably connected inside the mounting tubes (16), and a second spring (21) is fixedly connected between the push plate (20) and an adjacent slider (18).

5. A cryogenic gate valve that facilitates precooling as claimed in claim 4, characterized in that: The push plate (20) is fixedly connected to a push rod (22) on one side away from the second spring (21), and the push rod (22) slides through the outer ring (25). The outer ring (25) is rotatably connected to an adjustment ring (17), and the push rod (22) and the inner wall of the adjustment ring (17) are rotatably connected to an inclined first support rod (23).

6. A cryogenic gate valve that facilitates precooling as claimed in claim 5, characterized in that: A fixing frame (24) is fixedly connected between the bottom of the inner ring (33) and the outer ring (25); a mounting shaft (28) is rotatably connected to the bottom of the fixing frame (24); a worm gear (29) is fixedly connected to the bottom of the mounting shaft (28); a worm (27) is rotatably connected to the bottom of the fixing frame (24); the worm gear (27) is meshed with the worm gear (29); a mounting column (30) is fixedly connected to the surface of the worm gear (29); and a second support rod (31) which is inclined is rotatably connected between the mounting column (30) and the bottom of the adjusting ring (17).

7. A cryogenic gate valve for precooling as claimed in claim 4, characterized in that: The surface of the outer ring (25) is provided with a plurality of scale lines (32), and the surface of the adjustment ring (17) is fixed with a pointer used in conjunction with the scale lines (32).

8. A cryogenic gate valve for precooling as claimed in claim 4, characterized in that: An annular handle (26) is fixed on the top of the outer ring (25).

Images