Ultralow-temperature rotary valve body with heat insulation mechanism

Abstract

The utility model relates to the technical field of ultralow-temperature rotary valves, in particular to an ultralow-temperature rotary valve body with a heat insulation mechanism, which comprises flange plates, a valve body, a valve rod, an elliptical block and a valve plate, and further comprises a heat insulation cover, a heat insulation component, a driving bevel gear and a top seat, and exhaust holes are symmetrically formed in the periphery of the heat insulation cover, the top base is installed on the surface of the valve body, the top of the top base extends to the position above the heat insulation cover, and the heat insulation assembly is installed on the surface of the heat insulation cover. When the valve is opened, the sealing strip is attached to the inner periphery of the valve body to move, air between the valve body and the heat insulation cover is extruded out to form a negative pressure environment, the heat insulation effect of the valve body is effectively improved, the sealing strip is reset when the valve is closed, the duration of the sealing strip in the negative pressure environment is effectively shortened, the service life of the sealing strip can be prolonged, and the service life of the valve is prolonged. And the heat insulation effect of the subsequent ultralow-temperature rotary valve body is effectively maintained.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic rotary valve technology, specifically to a cryogenic rotary valve body with a heat insulation mechanism. Background Technology

[0002] Cryogenic rotary valves are valves specifically designed for controlling and regulating fluids in extremely low-temperature environments (typically below -150°C). They maintain normal operational performance under extreme temperature conditions and are widely used in systems involving the storage, transmission, and handling of liquid gases (such as liquid nitrogen, liquid helium, liquid oxygen, and liquefied natural gas), and are extensively applied in LNG carriers.

[0003] Because the temperature of the liquid gas is low, the cryogenic rotary valve is in the open state. When the liquid gas flows through the cryogenic rotary valve, the valve body temperature drops sharply due to heat exchange. The cryogenic rotary valve is exposed to the air environment. Due to the high humidity of the air at sea, a large amount of water vapor will freeze upon contact with the cold air and adhere to the surface of the cryogenic rotary valve, affecting the subsequent use of the cryogenic rotary valve.

[0004] To avoid the above problems, existing technologies typically incorporate a heat insulation layer on the cryogenic rotary valve body to isolate the low-temperature rotary valve from humid air. For example, a cryogenic safety valve with a heat insulation structure, published in CN117469439A, improves the heat insulation function of the cryogenic safety valve by setting a heat insulation structure between the valve body and the valve cover, resulting in good overall sealing performance and improved reliability, lifespan, and stability. However, in actual use, it has been found that outside air can enter between the valve body and the valve cover through the through-holes in the heat insulation structure. The heat insulation effect of atmospheric pressure air is limited, and the heat insulation effect gradually decreases as the valve continues to be opened.

[0005] To address this, a cryogenic rotary valve body with a thermal insulation mechanism is proposed. Utility Model Content

[0006] The purpose of this invention is to provide an ultra-low temperature rotary valve body with a heat insulation mechanism. When the valve is opened, the sealing strip in the heat insulation component moves to fit the inner circumference of the valve body, squeezing out the air between the valve body and the heat insulation cover to form a negative pressure environment, which effectively improves the heat insulation effect of the valve body. When the valve is closed, the sealing strip resets, effectively reducing the time the sealing strip is in a negative pressure environment, thereby extending the service life of the sealing strip and effectively maintaining the heat insulation effect of the ultra-low temperature rotary valve body.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A cryogenic rotary valve body with a heat insulation mechanism includes a flange, a valve body, a valve stem, an elliptical block, and a valve plate. It also includes a heat insulation cover, a heat insulation component, a drive bevel gear, and a top seat. The valve body and the heat insulation cover are both installed between the flanges. The heat insulation cover is located outside the valve body and has symmetrically arranged vent holes on its outer periphery. The top seat is installed on the surface of the valve body, and its top extends above the heat insulation cover. A fixed partition is installed between the inner periphery of the heat insulation cover and the outer wall of the top seat. The heat insulation component is installed on the surface of the heat insulation cover and extends to the inner side of the heat insulation cover and the top seat. The valve plate is rotatably installed inside the valve body. The elliptical block is installed on top of the valve plate and is rotatably connected to the inner wall of the top seat. The drive bevel gear is located inside the top seat and is installed on the outer periphery of the valve stem. When the valve stem rotates, it drives the drive bevel gear to rotate and drive the heat insulation component. The heat insulation component moves along the outer periphery of the valve body, squeezing out the air between the heat insulation cover and the valve body.

[0009] Preferably, the heat insulation assembly includes a top frame, a threaded rod, a slider, a sealing strip, and a transmission bevel gear. The top frame is symmetrically installed on the top of the heat insulation cover, and the end of the top frame is sealed to the outer wall of the top seat. The threaded rod is rotatably installed on the inner wall of the top frame, and the end of the threaded rod extends to the inner side of the top seat. The slider slides against the inner wall of the top frame, and the slider is threadedly connected to the threaded rod. The sealing strip slides against the outer periphery of the valve body and the inner periphery of the heat insulation cover, and the outer periphery of the sealing strip is connected to the end of the slider. The transmission bevel gear is installed at the end of the threaded rod, and the transmission bevel gear meshes with the drive bevel gear.

[0010] Preferably, a threaded ring is installed on the top of the top seat, and a first heat insulation cylinder is screwed onto the outer circumference of the threaded ring, with the bottom of the first heat insulation cylinder fitting against the surface of the top seat.

[0011] Preferably, a second heat insulation cylinder is installed on the top of the first heat insulation cylinder, a heat insulation frame is installed on the top of the second heat insulation cylinder, a handle is installed on the surface of the heat insulation frame, and the handle is connected to the top of the valve stem.

[0012] Preferably, the top of the heat insulation cover has a groove located inside the top frame, and the width of the groove is equal to the width of the slider.

[0013] Preferably, the vent is located on the outside of the heat insulation cover, and the vent is located on the side close to the top seat.

[0014] Preferably, the heat insulation cover has a notch on its outer periphery that matches the top seat, and the notch is connected to the sliding groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. By setting up a heat insulation cover, top seat, first heat insulation cylinder, second heat insulation cylinder and heat insulation frame, a heat insulation mechanism is formed on the outside of the valve body and valve stem. This helps to block the heat exchange between the valve body and valve stem and the air, and effectively avoids the ultra-low temperature rotary valve exposed to the air environment from being exposed to the air environment. Due to the high humidity of the air at sea, a large amount of water vapor will freeze and adhere to the surface of the ultra-low temperature rotary valve, affecting the subsequent use of the ultra-low temperature rotary valve.

[0017] 2. With the heat insulation component in place, when the valve body is opened by rotating the valve stem to change the angle of the valve plate, the threaded rod rotates together with the valve stem through the transmission bevel gear and the drive bevel gear. This causes the sealing strip to move towards the top seat side between the outer circumference of the valve body and the inner circumference of the heat insulation cover, thereby squeezing out the air between the valve body and the heat insulation cover and forming a negative pressure between the valve body and the heat insulation cover. This further improves the heat insulation effect of the valve body, thus fully ensuring the normal use of the valve body after it is opened.

[0018] 3. With the heat insulation component, when the valve body is closed by rotating the valve stem to change the valve plate angle, the threaded rod rotates together with the valve stem through the transmission bevel gear and the drive bevel gear. This causes the sealing strip to move towards the corresponding flange side between the outer circumference of the valve body and the inner circumference of the heat insulation cover, thereby resetting the sealing strip. When the valve body is not in the open state, this prevents the sealing strip from being subjected to negative pressure for a long time and causing irreversible deformation, thereby extending the service life of the sealing strip and helping to maintain the heat insulation effect of the valve body for a long time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 It is a cross-sectional view of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the top seat of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the heat insulation cover of this utility model;

[0023] Figure 5 This is a schematic diagram of the sealing strip of this utility model.

[0024] In the diagram: 1. Flange; 2. Valve body; 3. Heat insulation cover; 31. Vent; 32. Fixed partition; 4. Heat insulation assembly; 5. Top frame; 6. Threaded rod; 7. Slider; 8. Sealing strip; 9. Transmission bevel gear; 10. Drive bevel gear; 11. Valve stem; 12. Elliptical block; 13. Valve plate; 14. Top seat; 141. Threaded ring; 15. First heat insulation cylinder; 16. Second heat insulation cylinder; 17. Heat insulation frame; 18. Handle. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1 to 5 This utility model provides an ultra-low temperature rotary valve body with a heat insulation mechanism, the technical solution of which is as follows:

[0027] A cryogenic rotary valve body with a heat insulation mechanism includes a flange 1, a valve body 2, a valve stem 11, an elliptical block 12, and a valve plate 13. It also includes a heat insulation cover 3, a heat insulation assembly 4, a drive bevel gear 10, and a top seat 14. The valve body 2 and the heat insulation cover 3 are both installed between the flange 1. The heat insulation cover 3 is located outside the valve body 2. Symmetrically arranged vent holes 31 are opened on the outer periphery of the heat insulation cover 3, and the vent holes 31 are located on the outer side of the heat insulation cover 3, close to the top seat 14. The top seat 14 is installed on the surface of the valve body 2, and its top extends above the heat insulation cover 3. A fixed partition 32 is installed between the inner periphery of the heat insulation cover 3 and the outer wall of the top seat 14. The fixed partition 32 divides the space between the heat insulation cover 3 and the valve body 2 into three parts. The space between the fixed partitions 32, combined with the top seat 14, is a sealed space, while the spaces at both ends are movable spaces. When the valve body 2 is closed, the pressure in the movable space is equal to the pressure in the outer space. The uniform atmospheric pressure prevents the heat insulation cover 3 from deforming due to pressure changes caused by temperature variations in the sealed space. The heat insulation component 4 is installed on the surface of the heat insulation cover 3 and extends to the inside of the heat insulation cover 3 and the top seat 14. The valve plate 13 is rotatably installed inside the valve body 2. The elliptical block 12 is installed on the top of the valve plate 13 and is rotatably connected to the inner wall of the top seat 14. The drive bevel gear 10 is located inside the top seat 14 and is installed on the outer periphery of the valve stem 11. When the valve stem 11 rotates, it drives the drive bevel gear 10 to rotate and drive the heat insulation component 4. The heat insulation component 4 moves along the outer periphery of the valve body 2 and squeezes out the air between the heat insulation cover 3 and the valve body 2. In a negative pressure environment, the gas density decreases and the thermal conductivity also decreases accordingly, which means that the efficiency of heat transfer in the gas is reduced, thereby reducing heat conduction to a certain extent and effectively improving the heat insulation effect on the valve body 2.

[0028] Reference Figure 2 , Figure 4 and Figure 5In one embodiment of this application, the heat insulation assembly 4 includes a top frame 5, a threaded rod 6, a slider 7, a sealing strip 8, and a transmission bevel gear 9. The top frame 5 is symmetrically mounted on the top of the heat insulation cover 3, and the end of the top frame 5 is sealed to the outer wall of the top seat 14. The threaded rod 6 is rotatably mounted on the inner wall of the top frame 5, and the end of the threaded rod 6 extends to the inner side of the top seat 14. The slider 7 slides against the inner wall of the top frame 5, and the slider 7 is threadedly connected to the threaded rod 6. The sealing strip 8 slides against the outer periphery of the valve body 2 and the inner periphery of the heat insulation cover 3, and the outer periphery of the sealing strip 8 is connected to the end of the slider 7. The transmission bevel gear 9 is mounted on the end of the threaded rod 6, and... The transmission bevel gear 9 meshes with the drive bevel gear 10. When the valve stem 11 rotates to open the valve body 2, it simultaneously drives the drive bevel gear 10 to rotate, which in turn causes the transmission bevel gear 9 to rotate simultaneously. The threaded rod 6 rotates together with the transmission bevel gear 9. At this time, the slider 7 moves horizontally along the slide groove under the action of the threaded rod 6. The slider 7 then drives the sealing strip 8 to move towards the top seat 14, squeezing out the air in the active space between the valve body 2 and the heat insulation cover 3, forming a negative pressure space. When the valve stem 11 rotates to close the valve body 2, it simultaneously drives the drive bevel gear 10 to rotate in the opposite direction, which in turn moves the sealing strip 8 to fit against the flange 1.

[0029] Reference Figure 3 As one embodiment of this application, a threaded ring 141 is installed on the top of the top seat 14, and a first heat insulation cylinder 15 is screwed onto the outer circumference of the threaded ring 141. The bottom of the first heat insulation cylinder 15 is in contact with the surface of the top seat 14, and the first heat insulation cylinder 15 is conveniently installed on the top of the top seat 14 under the action of the threaded ring 141.

[0030] Reference Figure 1 As one embodiment of this application, a second heat insulation cylinder 16 is installed on the top of the first heat insulation cylinder 15, a heat insulation frame 17 is installed on the top of the second heat insulation cylinder 16, a handle 18 is installed on the surface of the heat insulation frame 17, and the handle 18 is installed and connected to the top of the valve stem 11. The first heat insulation cylinder 15, the second heat insulation cylinder 16 and the heat insulation frame 17 together wrap the valve stem 11 inside to prevent the valve stem 11 from exchanging heat with the humid air.

[0031] Reference Figure 4 As one embodiment of this application, the top of the heat insulation cover 3 is provided with a sliding groove located inside the top frame 5, and the width of the sliding groove is equal to the width of the slider 7. Under the action of the sliding groove, the slider 7 can only move in a straight line, thereby allowing the sealing strip 8 to move horizontally against the outer periphery of the valve body 2.

[0032] Reference Figure 4 As one embodiment of this application, the heat insulation cover 3 has a notch on its outer periphery that is adapted to the top seat 14, and the notch is connected to the slide groove. The notch is used to install the top seat 14.

[0033] Working principle: When the valve body 2 needs to be opened, turn the handle 18 clockwise. The handle 18 drives the valve stem 11 to rotate clockwise, which drives the bevel gear 10 to rotate clockwise with the valve stem 11. Then, the threaded rod 6 rotates in the corresponding direction under the action of the transmission bevel gear 9. The slider 7 moves linearly along the slide groove under the action of the threaded rod 6. Thus, the slider 7 drives the sealing strip 8 to move towards the top seat 14. The sealing strip 8 squeezes out the air in the active space between the valve body 2 and the heat insulation cover 3, forming a negative pressure environment, thereby improving the heat insulation effect of the valve body 2.

[0034] When valve body 2 needs to be closed, turn handle 18 counterclockwise. Handle 18 drives valve stem 11 to rotate counterclockwise, driving bevel gear 10 to rotate counterclockwise with valve stem 11. Then, threaded rod 6 rotates in the corresponding direction under the action of transmission bevel gear 9. Slider 7 moves linearly along slide groove under the action of threaded rod 6. Thus, slider 7 drives sealing strip 8 to move towards the corresponding flange 1 side. Sealing strip 8 returns to its original position and keeps in contact with flange 1, preventing irreversible deformation of sealing strip 8 due to prolonged exposure to negative pressure.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cryogenic rotary valve body with a heat insulation mechanism, comprising a flange (1), a valve body (2), a valve stem (11), an elliptical block (12), and a valve plate (13), characterized in that: It also includes a heat insulation cover (3), a heat insulation component (4), a drive bevel gear (10), and a top seat (14). The valve body (2) and the heat insulation cover (3) are both installed between the flange (1). The heat insulation cover (3) is located outside the valve body (2). The heat insulation cover (3) has symmetrically arranged exhaust holes (31) on its outer periphery. The top seat (14) is installed on the surface of the valve body (2), and the top of the top seat (14) extends above the heat insulation cover (3). A fixed partition (32) is installed between the inner periphery of the heat insulation cover (3) and the outer wall of the top seat (14). The heat insulation component (4) is installed on the surface of the heat insulation cover (3) and provides heat insulation. The component (4) extends to the inner side of the heat insulation cover (3) and the top seat (14). The valve plate (13) is rotatably installed inside the valve body (2). The elliptical block (12) is installed on the top of the valve plate (13) and is rotatably connected to the inner wall of the top seat (14). The driving bevel gear (10) is located inside the top seat (14) and is installed on the outer periphery of the valve stem (11). When the valve stem (11) rotates, it drives the driving bevel gear (10) to rotate and drive the heat insulation component (4). The heat insulation component (4) moves along the outer periphery of the valve body (2) and squeezes out the air between the heat insulation cover (3) and the valve body (2).

2. The cryogenic rotary valve body with a heat insulation mechanism according to claim 1, characterized in that: The heat insulation component (4) includes a top frame (5), a threaded rod (6), a slider (7), a sealing strip (8), and a transmission bevel gear (9). The top frame (5) is symmetrically installed on the top of the heat insulation cover (3), and the end of the top frame (5) is sealed to the outer wall of the top seat (14). The threaded rod (6) is rotatably installed on the inner wall of the top frame (5), and the end of the threaded rod (6) extends to the inner side of the top seat (14). The slider (7) slides against the inner wall of the top frame (5), and the slider (7) is threadedly connected to the threaded rod (6). The sealing strip (8) slides against the outer periphery of the valve body (2) and the inner periphery of the heat insulation cover (3), and the outer periphery of the sealing strip (8) is connected to the end of the slider (7). The transmission bevel gear (9) is installed at the end of the threaded rod (6), and the transmission bevel gear (9) meshes with the drive bevel gear (10).

3. The cryogenic rotary valve body with a heat insulation mechanism according to claim 2, characterized in that: The top of the top seat (14) is fitted with a threaded ring (141), and a first heat insulation cylinder (15) is screwed onto the outer circumference of the threaded ring (141), with the bottom of the first heat insulation cylinder (15) in contact with the surface of the top seat (14).

4. A cryogenic rotary valve body with a heat insulation mechanism according to claim 3, characterized in that: The first heat insulation cylinder (15) is equipped with a second heat insulation cylinder (16) on top, and the second heat insulation cylinder (16) is equipped with a heat insulation frame (17) on top. The heat insulation frame (17) is equipped with a handle (18) on its surface, and the handle (18) is connected to the top of the valve stem (11).

5. A cryogenic rotary valve body with a heat insulation mechanism according to claim 2, characterized in that: The heat insulation cover (3) has a groove on the top of the top frame (5) and the width of the groove is equal to the width of the slider (7).

6. A cryogenic rotary valve body with a heat insulation mechanism according to claim 1, characterized in that: The exhaust port (31) is located on the outside of the heat insulation cover (3), and the exhaust port (31) is located on the side close to the top seat (14).

7. A cryogenic rotary valve body with a heat insulation mechanism according to claim 5, characterized in that: The heat insulation cover (3) has a notch on its outer periphery that is adapted to the top seat (14), and the notch is connected to the slide groove.

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