Ultralow-temperature stop valve with pressure relief device

Abstract

The invention relates to the technical field of stop valve devices, in particular to an ultralow-temperature stop valve with a pressure relief device, which comprises a valve body, a valve cover is arranged at the top end of the valve body, a through hole is formed in one side of the valve body in a penetrating manner, a positioning opening is formed in the outer side of the through hole, a threaded hole is formed in the outer side of the positioning opening, and the through hole is communicated with a pressure relief hole formed in the valve body. A pressure relief hole is formed in the butt strap, an active pressure relief device is arranged in the pressure relief hole and comprises a pressure relief plate and a plug fixed to the inner side of the pressure relief plate, a positioning plate is fixed in the positioning opening, a buffer assembly is arranged in the hole groove, and the buffer assembly comprises a telescopic rod and a spring arranged on the outer side of the telescopic rod in a sleeving mode. According to the pressure relief device, in the moving process, the situation that shaking does not occur can be achieved, when the pressure relief device makes contact with a high-pressure medium, the situation that the telescopic rod and the spring deviate is avoided, and the active pressure relief devices symmetrically arranged on the two sides can achieve the function of quick pressure relief within a short time.

Description

Technical Field

[0001] The invention relates to the technical field of stop valve devices, and in particular to an ultra-low temperature stop valve with a pressure relief device. Background Art

[0002] Cryogenic stop valves are suitable for the management system of cryogenic liquid storage and transportation equipment. They are flexible to open and close and have reliable sealing. They can also be used in the management system of other cryogenic and deep-cold media. Cryogenic stop valves mainly refer to stop valves in cryogenic liquid media systems with a medium operating temperature of -253 degrees to -85 degrees.

[0003] In the invention patent with application number CN202323249853.2 in China, a flange stop valve is introduced, wherein the stop valve cover is bolted on the top, the stop valve stem is installed through the center of the top of the stop valve cover, the surface of the stop valve stem and the inner cavity of the stop valve body are fixedly connected with the stop valve disc, the center of the bottom of the stop valve cover is installed with a sealing protection component, and the top of the stop valve stem surface is installed with a driving hand wheel. The present invention cooperates with a rubber sealing ring and a rubber sealing sleeve to achieve a double sealing effect, and the auxiliary connecting ring and the supporting spring further improve the sealing effect.

[0004] However, in actual design and use, in addition to following the general valve design principles, there are also some special requirements. At present, in some special occasions, once the low-temperature stop valve is activated, the outlet pressure will gradually increase and cannot be adjusted, which is easy to damage the valve and poses certain dangers, or the medium will be wasted due to the inability to adjust the outlet pressure. Summary of the invention

[0005] Technical issues solved

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides an ultra-low temperature stop valve with a pressure relief device. The active pressure relief device is provided. When the medium enters one side of the valve body, when the pressure at the inlet end is too large, the plug structure can be pushed outward through the pressure relief hole. Since the plug and the pressure relief plate are connected in combination, they can move outward. When moving, they can be stretched outward by the telescopic rod and the spring. Therefore, when the medium is pushed out, it can be sprayed out through the gap between the plug-plug ring and the positioning plate, so as to achieve the effect of automatic pressure relief. Since the telescopic rod-spring is in the empty groove of the strap plate, it can be achieved that there is no shaking during the movement, and the deviation of the telescopic rod and the spring is avoided when contacting with the high-pressure medium. The active pressure relief devices symmetrically arranged on both sides can realize the function of rapid pressure relief in a short time. The valve core assembly is provided, and the user can connect and fix the valve core assembly with the valve stem structure at the top, and through The valve stem is fixed to the upper blocking ring by clamping, the bottom end of the upper blocking ring is connected to the connecting head, the outer side of the connecting head is connected and clamped to the locking ring, and a blocking ring is arranged on the outer side of the upper blocking ring and the locking ring. Since multiple groups of stacked combination structures are adopted internally to form a multi-layer sealing structure, the three groups of sealing structures of blocking ring-upper blocking ring-locking ring, upper blocking ring-locking ring, upper blocking ring-connecting head-locking ring combination can increase the sealing performance and service life. Finally, when in contact with the valve body, a combined contact method of rubber ring and wear-resistant disc is adopted to avoid direct metal contact between the metal valve core assembly and the valve body, improve the structural stability during contact, and facilitate the user to replace such easily worn parts; so it can effectively solve the problem in the prior art that once the low-temperature stop valve is activated, the pressure on the outlet side will gradually increase and cannot be adjusted, which is easy to damage the valve and has certain risks, or the problem of medium waste due to the inability to adjust the pressure on the outlet side.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The present invention provides an ultra-low temperature stop valve with a pressure relief device, comprising a valve body, a valve cover is arranged on the top of the valve body, a through hole is penetrated through one side of the valve body, a positioning port is arranged on the outer side of the through hole, a threaded hole is arranged on the outer side of the positioning port, the through hole is communicated with the pressure relief hole arranged in the valve body, and an active pressure relief device is arranged in the pressure relief hole, the active pressure relief device comprises a pressure relief plate and a plug fixed on the inner side of the pressure relief plate, a positioning plate is fixed in the positioning port, a strap is fixed on the outer side wall of the positioning plate, a hole groove is arranged in the middle of the strap, and a A buffer assembly, wherein the buffer assembly includes a telescopic rod and a spring sleeved on the outside of the telescopic rod, the two ends of the telescopic rod and the spring are respectively on the side walls of the hole groove and the pressure relief plate, a valve stem is arranged in the valve cover, a valve core assembly is fixed to the bottom end of the valve stem, and a wear-resistant assembly is arranged at the bottom end of the valve core assembly, the valve core assembly includes an upper blocking ring fixed to the bottom end of the valve stem, a connecting head fixed to the middle part of the bottom end of the upper blocking ring, a locking ring fixed to the outside of the connecting head and a blocking ring arranged on the outside of the connecting head and the locking ring, a hole is opened at the bottom end of the blocking ring, and a leakage hole is opened through the outer wall of the blocking ring.

[0010] Furthermore, the straps are fixed to the positioning plate in an equidistant array, and the positioning plate is fixed in the threaded hole by locking bolts.

[0011] Furthermore, a blocking ring is fixed to the end of the plug, and the plug is interference fit with the through hole through the blocking ring, and the positioning plate is a hollow structure.

[0012] Furthermore, the length of the plug is adapted to the extension and retraction amount of the telescopic rod, and the strap is a fan-shaped structure; and since the telescopic rod-spring is in the empty groove of the strap, it can be achieved that no shaking occurs during the movement, thereby improving the avoidance of deviation of the telescopic rod and the spring when in contact with high-pressure media, and the active pressure relief device symmetrically arranged on both sides can achieve the function of rapid pressure relief in a short time.

[0013] Furthermore, an annular arc groove is opened inward at the bottom of the end of the valve stem, and a groove body structure is opened in the middle of the upper blocking ring, and a protrusion with a size matching the size of the arc groove is fixed on the inner wall of the upper blocking ring; the three sets of sealing structures of blocking ring-upper blocking ring-locking ring, upper blocking ring-locking ring, upper blocking ring-connector-locking ring combination can increase the sealing performance and service life, and finally, when contacting with the valve body, a combined contact method of rubber ring and wear-resistant disc is adopted, which can avoid direct metal contact between the metal valve core assembly and the valve body, improve the structural stability during contact, and facilitate the user to replace such easily-worn parts.

[0014] Furthermore, the inner diameter of the blocking ring is matched with the outer diameters of the locking ring and the upper blocking ring, and a hollow rubber ring is arranged between the bottom end of the locking ring and the side wall of the blocking ring.

[0015] Furthermore, the active pressure relief device is symmetrically arranged at both ends of the outlet side of the valve body; the active pressure relief device is arranged, when the medium enters one side of the valve body, when the pressure at the inlet end is too large, the plug structure can be pushed outward through the pressure relief hole, and since the plug and the pressure relief plate are combined and connected, they can move outward, and when moving, they can be stretched outward by the telescopic rod and the spring, so when the medium is pushed out, it can be sprayed out through the gap between the plug-plug ring and the positioning plate, thereby achieving the effect of automatic pressure relief.

[0016] Furthermore, the wear-resistant component is arranged in the valve cavity of the valve body, and the wear-resistant component includes a wear-resistant disk and bolts for fixing the wear-resistant disk, and the wear-resistant disk is fixed in the valve body by the bolts.

[0017] Furthermore, the bottom end of the connecting head is an inverted frustum structure, and a groove body matching the size of the frustum is opened in the middle of the locking ring; through the arranged valve core assembly, the user can connect and fix the valve core assembly through the valve stem structure at the top, and fix it with the upper blocking ring through the valve stem, the bottom end of the upper blocking ring is connected to the connecting head, and the outer side of the connecting head is connected and fixed with the locking ring, and a blocking ring is arranged on the outer side of the upper blocking ring and the locking ring. Since multiple groups of stacked combination structures are adopted inside, a multi-layer sealing structure is formed.

[0018] Furthermore, a circular lap plate structure is provided on the outer side wall of the top end of the upper blocking ring, and the top end of the upper blocking ring is provided by the circular lap plate.

[0019] Beneficial Effects

[0020] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0021] The present invention provides an active pressure relief device. When the medium enters one side of the valve body, the plug structure can be pushed outward through the pressure relief hole when the pressure at the inlet end is too large. Since the plug and the pressure relief plate are combined and connected, they can move outward. When moving, they can be stretched outward by the telescopic rod and the spring. Therefore, when the medium is pushed out, it can be sprayed out through the gap between the plug-plug ring and the positioning plate, thereby achieving the effect of automatic pressure relief. Since the telescopic rod-spring is in the empty groove of the strap plate, it can be achieved that there is no shaking during the movement, which improves the avoidance of deviation of the telescopic rod and the spring when contacting with the high-pressure medium. The active pressure relief devices symmetrically arranged on both sides can achieve the function of rapid pressure relief in a short time.

[0022] In the present invention, through the provided valve core assembly, the user can connect and fix the valve core assembly through the valve stem structure at the top, and fix it with the upper blocking ring through the valve stem. The bottom end of the upper blocking ring is connected to the connecting head, and the outer side of the connecting head is connected and clamped with the locking ring. A blocking ring is arranged on the outer side of the upper blocking ring and the locking ring. Since a plurality of stacked combination structures are adopted internally to form a multi-layer sealing structure, the three sealing structures of blocking ring-upper blocking ring-locking ring, upper blocking ring-locking ring, and upper blocking ring-connecting head-locking ring are combined to increase the sealing performance and service life. Finally, when contacting with the valve body, a combined contact method of rubber ring and wear-resistant disk is adopted to avoid direct metal contact between the valve core assembly made of metal material and the valve body, thereby improving the structural stability during contact and facilitating the user to replace such easily-worn parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a structural disassembly diagram of the valve body and the active pressure relief device of the present invention;

[0026] Figure 3 This is a structural breakdown diagram of the active pressure relief device in the present invention;

[0027] Figure 4 It is a structural explosion diagram of the active pressure relief device in the present invention;

[0028] Figure 5 It is a structural cross-sectional view of the valve body in the present invention;

[0029] Figure 6 for Figure 5 The main view of the structure;

[0030] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at A in FIG.

[0031] Figure 8 It is a structural disassembled diagram of the valve stem and valve core assembly of the present invention;

[0032] Fig. 9 This is a structural breakdown diagram of the valve core assembly in the present invention;

[0033] Fig.10It is a schematic diagram of the structure of the wear-resistant component in the present invention.

[0034] The numbers in the figure represent: 1. valve body; 11. positioning port; 12. through hole; 13. threaded hole; 14. pressure relief hole; 15. wear-resistant component; 151. wear-resistant disk; 152. bolt; 2. valve cover; 3. valve stem; 4. active pressure relief device; 41. pressure relief plate; 42. plug; 43. positioning plate; 44. strap; 441. hole groove; 45. buffer component; 451. telescopic rod; 452. spring; 46. locking bolt; 5. valve core component; 51. blocking ring; 511. leakage hole; 52. upper blocking ring; 53. connector; 54. locking ring; 55. rubber ring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention will be further described below in conjunction with the embodiments.

[0037] Embodiment: A cryogenic stop valve with a pressure relief device, see the attached Figure 1 -Attached Fig.10, comprising a valve body 1, a valve cover 2 is arranged at the top of the valve body 1, a through hole 12 is penetrated through one side of the valve body 1, a positioning port 11 is arranged on the outside of the through hole 12, a threaded hole 13 is arranged on the outside of the positioning port 11, the through hole 12 is communicated with a pressure relief hole 14 arranged in the valve body 1, and an active pressure relief device 4 is arranged in the pressure relief hole 14, the active pressure relief device 4 comprises a pressure relief plate 41 and a plug 42 fixed to the inner side of the pressure relief plate 41, a positioning plate 43 is fixed in the positioning port 11, a strap plate 44 is fixed on the outer side wall of the positioning plate 43, a hole groove 441 is arranged in the middle of the strap plate 44, a buffer component 45 is arranged in the hole groove 441, and the buffer component 45 The valve body 2 comprises a telescopic rod 451 and a spring 452 sleeved on the outside of the telescopic rod 451, the two ends of the telescopic rod 451 and the spring 452 are respectively connected to the hole groove 441 and the side wall of the pressure relief plate 41, the valve cover 2 is provided with a valve stem 3, the bottom end of the valve stem 3 is fixed with a valve core assembly 5, and the bottom end of the valve core assembly 5 is provided with a wear-resistant assembly 15, the valve core assembly 5 comprises an upper blocking ring 52 fixed to the bottom end of the valve stem 3, a connector 53 fixed to the middle of the bottom end of the upper blocking ring 52, a locking ring 54 fixed to the outside of the connector 53, and a blocking ring 51 arranged on the outside of the connector 53 and the locking ring 54, the bottom end of the blocking ring 51 is provided with a hole, and the outer wall of the blocking ring 51 is penetrated with a leakage hole 511;

[0038] The straps 44 are fixed on the positioning plate 43 in an equidistant array, and the positioning plate 43 is fixed in the threaded hole 13 by means of locking bolts 46; a plugging ring is fixed at the end of the plug 42, and the plug 42 is interference-fitted with the through hole 12 through the plugging ring, and the positioning plate 43 is a hollow structure;

[0039] The length of the plug 42 is matched with the extension and contraction amount of the telescopic rod 451. The strap 44 is a fan-shaped structure. When moving, it can be stretched outward by the telescopic rod 451 and the spring 452. Therefore, when the medium is ejected outward, it can be sprayed out through the gap between the plug 42-blocking ring 51 and the positioning plate 43, thereby achieving the effect of automatic pressure relief. Since the telescopic rod 451-spring 452 is in the empty groove of the strap 44, it can be achieved that there is no shaking during the movement, which improves the contact with the high-pressure medium.

[0040] The bottom of the end of the valve stem 3 is provided with an annular arc groove inwardly, and the middle of the upper plugging ring 52 is provided with a groove body structure, and a protrusion whose size matches the size of the arc groove is fixed on the inner wall of the upper plugging ring 52; through the provided valve core assembly 5, the user can connect and fix the valve core assembly 5 through the valve stem 3 structure at the top, and fix the valve stem 3 with the upper plugging ring 52 by clamping, the bottom end of the upper plugging ring 52 is connected with the connecting head 53, the outer side of the connecting head 53 is connected and clamped with the locking ring 54, and the outer sides of the upper plugging ring 52 and the locking ring 54 are provided with a plugging ring. Ring 51, due to the internal use of multiple groups of stacked combination structures to form a multi-layer sealing structure, the blocking ring 51-upper blocking ring 52-locking ring 54, upper blocking ring 52-locking ring 54, upper blocking ring 52-connector 53-locking ring 54 are combined into three sealing structures, which can increase the sealing performance and service life. Finally, when contacting with the valve body 1, a combined contact method of rubber ring 55 and wear-resistant disk 151 is adopted to avoid direct metal contact between the metal valve core assembly 5 and the valve body 1, thereby improving the structural stability during contact and facilitating the user to replace such easily-worn parts.

[0041] The inner diameter of the blocking ring 51 matches the outer diameters of the locking ring 54 and the upper blocking ring 52 , and a hollow rubber ring 55 is provided between the bottom end of the locking ring 54 and the side wall of the blocking ring 51 .

[0042] The active pressure relief device 4 is symmetrically arranged at both ends of the outlet side of the valve body 1. The active pressure relief devices 4 symmetrically arranged on both sides can make the medium at the outlet flow outward in a short time, thereby achieving the effect of active pressure relief. When the medium enters one side of the valve body 1, the active pressure relief device 4 can push the plug 42 structure outward through the pressure relief hole 14 when the pressure at the inlet end is too large. Since the plug 42 and the pressure relief plate 41 are combined and connected, they can move outward. When moving, they can be stretched outward by the telescopic rod 451 and the spring 452. Therefore, when the medium is pushed out, it can be sprayed out through the gap between the plug 42-plugging ring 51 and the positioning plate 43, thereby achieving the effect of automatic pressure relief. Since the telescopic rod 451-spring 452 is in the empty groove of the strap 44, it can be achieved that no shaking occurs during the movement, thereby improving the situation of avoiding the deviation of the telescopic rod 451 and the spring 452 when contacting with the high-pressure medium. The active pressure relief device 4 symmetrically arranged on both sides can achieve the function of rapid pressure relief in a short time.

[0043] The wear-resistant component 15 is arranged in the valve cavity of the valve body 1, and the wear-resistant component 15 includes a wear-resistant disc 151 and a bolt 152 for fixing the wear-resistant disc 151. The wear-resistant disc 151 is fixed in the valve body 1 by the bolt 152. The wear-resistant disc 51 is a bowl-shaped structure. The user can fix the wear-resistant disc 151 in the valve cavity of the valve body 1 by the bolt 152 to achieve a fixed connection. When the blocking ring 51 moves, the blocking ring 51 made of metal can contact the wear-resistant disc 151 to reduce the wear caused by the contact of the metal structure.

[0044] The bottom end of the connector 53 is an inverted truncated cone structure, and a groove body matching the size of the truncated cone body is opened in the middle of the locking ring 54. The truncated cone body is fixed in the groove body to achieve a combined connection between the two. When the valve stem 3 at the top rotates, the bottom structure can be driven to move upward synchronously, and the two can also achieve a good blocking effect when receiving the bottom medium pressure.

[0045] The top outer wall of the upper blocking ring 52 is provided with a circular lap plate structure, and the upper blocking ring 52 is provided with the top of the blocking ring 51 through the circular lap plate; the circular lap plate structure is convenient for bridging and fixing with the blocking ring 51 (which can be understood as welding fixation, but the fixing method includes but is not limited to welding), thereby realizing the connection and fixation between the two structures.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cryogenic stop valve with a pressure relief device, characterized in that: The invention comprises a valve body (1), a valve cover (2) is arranged at the top end of the valve body (1), a through hole (12) is formed through one side of the valve body (1), a positioning opening (11) is formed on the outer side of the through hole (12), a threaded hole (13) is formed on the outer side of the positioning opening (11), the through hole (12) is communicated with a pressure relief hole (14) formed in the valve body (1), and an active pressure relief device (4) is arranged in the pressure relief hole (14), the active pressure relief device (4) comprises a pressure relief plate (41) and a plug (42) fixed to the inner side of the pressure relief plate (41), a positioning plate (43) is fixed in the positioning opening (11), a strap plate (44) is fixed on the outer side wall of the positioning plate (43), a hole groove (441) is formed in the middle of the strap plate (44), a buffer component (45) is arranged in the hole groove (441), and the buffer component (45) The valve cover (2) comprises a telescopic rod (451) and a spring (452) sleeved on the outside of the telescopic rod (451), the two ends of the telescopic rod (451) and the spring (452) are respectively connected to the hole groove (441) and the side wall of the pressure relief plate (41), a valve stem (3) is arranged in the valve cover (2), a valve core assembly (5) is fixed to the bottom end of the valve stem (3), and a wear-resistant assembly (15) is arranged at the bottom end of the valve core assembly (5), and the valve The core assembly (5) comprises an upper blocking ring (52) fixed to the bottom end of the valve stem (3), a connecting head (53) fixed to the middle of the bottom end of the upper blocking ring (52), a locking ring (54) fixed to the outside of the connecting head (53), and a blocking ring (51) arranged on the outside of the connecting head (53) and the locking ring (54), wherein a hole is provided at the bottom end of the blocking ring (51), and a leakage hole (511) is provided through the outer wall of the blocking ring (51).

2. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: The straps (44) are fixed on the positioning plate (43) in an equidistant array, and the positioning plate (43) is fixed in the threaded hole (13) by means of locking bolts (46).

3. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: A blocking ring is fixed to the end of the plug (42), and the plug (42) is interference-fitted with the through hole (12) through the blocking ring, and the positioning plate (43) is a hollow structure.

4. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: The length of the plug (42) is adapted to the telescopic amount of the telescopic rod (451), and the bridge plate (44) is a fan-shaped structure.

5. The ultra-low temperature stop valve with a pressure relief device according to claim 4, characterized in that: An annular arc groove is provided inwardly at the bottom of the end of the valve stem (3), a groove structure is provided in the middle of the upper blocking ring (52), and a protrusion with a size matching that of the arc groove is fixed on the inner wall of the upper blocking ring (52).

6. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: The inner diameter of the blocking ring (51) matches the outer diameters of the locking ring (54) and the upper blocking ring (52), and a hollow rubber ring (55) is provided between the bottom end of the locking ring (54) and the side wall of the blocking ring (51).

7. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: The active pressure relief device (4) is symmetrically arranged at both ends of the outlet side of the valve body (1).

8. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: The wear-resistant component (15) is arranged in the valve cavity of the valve body (1), and the wear-resistant component (15) comprises a wear-resistant disc (151) and bolts (152) for fixing the wear-resistant disc (151), and the wear-resistant disc (151) is fixed in the valve body (1) by the bolts (152).

9. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: The bottom end of the connector (53) is an inverted truncated cone structure, and the middle of the locking ring (54) is provided with a groove body that matches the size of the truncated cone body.

10. The ultra-low temperature stop valve with a pressure relief device according to claim 1, characterized in that: The top outer wall of the upper blocking ring (52) is provided with a circular plate structure, and the upper blocking ring (52) is provided with the top of the blocking ring (51) through the circular plate.

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