Pressure relief device for hot replacement of rupture disc (variants)

Abstract

FIELD: pressure relief device. SUBSTANCE: pressure relief device that is used in a flow relief position in a flow channel, which allows the pressure relief device to relieve flow in a flow channel in which two valve bodies are located opposite each other in a flow relief position. The pressure relief device comprises a first sliding plate assembly and a second sliding plate assembly, wherein the first sliding plate assembly comprises a first rupture disc and the second sliding plate assembly comprises a second rupture disc. When the second sliding plate assembly is located between the two valve bodies, the second rupture disc is located in the flow passage and the first sliding plate assembly is located outside the two valve bodies. The first sliding plate assembly and the second sliding plate assembly are releasably connected to each other, and after the second rupture membrane ruptures, the second sliding plate assembly is configured to move outward from the two valve bodies, and the first sliding plate assembly is configured to move into the space between the two valve bodies so that the first rupture plate can be inserted into the flow channel.EFFECT: increase in switching efficiency.11 cl, 12 dwg

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present invention claims priority from Chinese Patent Application No. 202310463638.8, filed on April 26, 2023, entitled "pressure relief device, mounting device, sliding plate assembly and system for implementing hot replacement of a rupture disc", the entire contents of which are incorporated into the present specification by reference.

[0003] FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[0004] The present invention relates to a pressure relief device, a mounting device, a sliding plate assembly and a system for implementing hot replacement of a rupture disc with a hot replacement function.

[0005] STATE OF THE ART

[0006] A rupture disc is a device for emergency pressure relief that is designed without the ability to reclose. A ruptured rupture disc must be replaced promptly. As shown in FIG. 1, the prior art uses pipeline flanges and bolts to secure the rupture disc. To replace the rupture disc, loosen all flange bolts, move the pipeline aside, remove the rupture disc holder, then align the installation positions to replace the rupture disc with a new rupture disc, and finally tighten all flange bolts.

[0007] This method is characterized by low switching efficiency, long downtime, and requires significant labor and material resources, especially when using a large-diameter rupture disc. Furthermore, the requirements for on-site installation of the rupture disc are relatively strict. Even the slightest carelessness during on-site replacement can affect the accuracy of burst pressure determination and, in the worst case, even lead to serious industrial accidents.

[0008] SUMMARY OF THE INVENTION

[0009] The objective of the present invention is to overcome the disadvantages of the prior art. The present invention provides a pressure relief device and a system for implementing hot-swappable rupture discs, which solve the problem of rupture disc replacement in the prior art and enable hot-swappable rupture discs.

[0010] The technical solution proposed by the present invention is as follows.

[0011] The first aspect provides a pressure relief device for implementing hot replacement of a rupture disc, wherein the pressure relief device is used in a flow relief position in a flow passage, which allows the pressure relief device to relieve the flow in the flow passage, and two valve bodies are arranged opposite each other in the flow relief position. The pressure relief device comprises:

[0012] a first sliding plate assembly and a second sliding plate assembly, wherein the first sliding plate assembly comprises a first rupture disc, and the second sliding plate assembly comprises a second rupture disc; and if the second sliding plate assembly is located between the two valve bodies, the second rupture disc is within the flow channel, and the first sliding plate assembly is located outside the two valve bodies.

[0013] The first sliding plate assembly and the second sliding plate assembly are releasably connected to each other, and after the second rupture disc is ruptured, the second sliding plate assembly can be moved outward from the two valve bodies, and the first sliding plate assembly can be moved into the space between the two valve bodies, which allows the first rupture disc to be inserted into the flow passage.

[0014] In one embodiment of the first aspect, the pressure relief device further comprises a transfer mechanism configured to move the second sliding plate assembly outward from the two valve bodies.

[0015] In one embodiment of the first aspect, the first sliding plate assembly comprises a first upper holder and a first lower holder, the first rupture membrane is located between the first upper holder and the first lower holder, and the first upper holder is releasably connected to the first lower holder.

[0016] In one embodiment of the first aspect, a plurality of first bolts connect the first upper holder to the first lower holder, each of the plurality of first bolts passes through the first upper holder and is threadedly connected to the first lower holder, and the plurality of first bolts are uniformly arranged.

[0017] In one embodiment of the first aspect, the pressure relief device further comprises a connecting device inserted to removably connect the first lower holder and the second lower holder.

[0018] In one embodiment of the first aspect, the connecting device comprises a connecting bolt, wherein a threaded hole is provided in the first lower holder and the second lower holder, respectively, wherein the two ends of the connecting bolt are connected by thread to the threaded hole of the first lower holder and the threaded hole of the second lower holder, respectively.

[0019] In one embodiment of the first aspect, the pressure relief device further comprises a positioning device located between the first sliding plate assembly and the second sliding plate assembly, and the positioning device is configured to position the first sliding plate assembly and the second sliding plate assembly in the same plane.

[0020] In one embodiment of the first aspect, the positioning device comprises a positioning recognition key, the first lower holder comprises a first groove, the second lower holder comprises a second groove, and one end of the positioning recognition key is placed in the first groove, and the other end of the positioning recognition key is inserted into the second groove.

[0021] In one embodiment of the first aspect, the positioning recognition key has a rectangular shape.

[0022] In one embodiment of the first aspect, a connecting hole is provided at the end of the positioning recognition key, the positioning device further comprises a positioning pin, wherein the positioning pin passes through the connecting hole, and the two ends of the positioning pin are inserted into the first lower holder so that the positioning recognition key is rotatably connected to the first lower holder.

[0023] In one embodiment of the first aspect, the positioning recognition key comprises a middle portion, a first end portion and a second end portion; the first end portion and the second end portion are located at two ends of the middle portion, respectively; the width of the middle portion is greater than the width of the first end portion and the width of the second end portion, the first end portion comprises a first groove, the second end portion comprises a second groove, and the middle portion comprises a gap between the first lower holder and the second lower holder.

[0024] In one embodiment of the first aspect, the connecting device comprises a support plate, and the first lower holder and the second lower holder are detachably connected to the support plate.

[0025] In one embodiment of the first aspect, both the upper side of the support plate and the lower side of the support plate comprise a sealing ring for realizing a seal between the support plate and the valve body, a seal between the first lower holder and the support plate, and a seal between the second lower holder and the support plate.

[0026] In one embodiment of the first aspect, the support plate comprises a mounting groove, and the side of the first lower holder facing the support plate and the side of the second lower holder facing the support plate comprise a projection corresponding to the mounting groove.

[0027] In one embodiment of the first aspect, the side of the first lower holder facing away from the second lower holder comprises a limit plate, and if the limit plate contacts the valve body, the first rupture disc is moved to the correct position.

[0028] In one embodiment of the first aspect, the side of the first upper holder facing away from the first rupture disc comprises the first sealing ring, and the surface of the first lower holder facing away from the first rupture disc comprises a lower annular groove, and the second sealing ring is located in the lower annular groove, which makes it possible to realize a seal between the support plate and the valve body, a seal between the first lower holder and the support plate, and a seal between the second lower holder and the support plate.

[0029] In one embodiment of the first aspect, the switching mechanism comprises a lifting frame, a valve stem nut, a valve stem, a trunnion in a fork and a bolt; the lifting frame is connected to one of the valve bodies without the possibility of displacement; in the direction of movement of the sliding plate assembly, the valve stem nut is limited by the side of the lifting frame and is configured to rotate relative to the lifting frame, an internal thread is provided inside the valve stem nut that matches the external thread of the valve stem, and the valve stem is driven axially by rotating the valve stem nut; the end of the valve stem is connected to the trunnion in the fork, the first sliding plate assembly is connected to the connecting portion, and the bolt passes through the connecting portion and the trunnion in the fork to connect the trunnion in the fork with the first sliding plate assembly.

[0030] In one embodiment of the first aspect, the pressure relief device further comprises a clamping mechanism comprising a first main drive shaft, a second main drive shaft, a first auxiliary drive shaft, a second auxiliary drive shaft, a left clamping block, a right clamping block, an eccentric shaft link and a crank connection; each of the two valve bodies comprises an intermediate flange; the first main drive shaft and the second main drive shaft are located on two opposite sides of one of the two valve bodies, respectively, and on the side of the intermediate flange of one of the two valve bodies facing away from the other valve body; the left clamping block is connected to the end of the first main drive shaft and the end of the second main drive shaft;the first auxiliary drive shaft and the second auxiliary drive shaft are arranged on two opposite sides of the other valve body, respectively, and on the side of the intermediate flange of the other of the two valve bodies facing away from the first main drive shaft; each of the two ends of the first main drive shaft and each of the two ends of the first auxiliary drive shaft are connected by an eccentric shaft link, each of the two ends of the second main drive shaft and each of the two ends of the second auxiliary drive shaft are connected by an eccentric shaft link; one end of the first main drive shaft is connected to the drive mechanism, and the other end of the first main drive shaft is connected to the second main drive shaft by means of a crank connection;a crank connection is provided between the first main drive shaft and the second main drive shaft, which allows the first main drive shaft to rotate the second main drive shaft; and the first main drive shaft and the second main drive shaft are eccentric rods.

[0031] The second aspect provides a pressure relief device for implementing hot replacement of a rupture disc, wherein the pressure relief device is used in a flow relief position in a flow passage, which allows the pressure relief device to relieve the flow in the flow passage, and two valve bodies are arranged opposite each other in the flow relief position. The pressure relief device comprises a first sliding plate assembly containing a first rupture disc; and

[0032] the transfer mechanism, after the rupture of the second rupture membrane on the second sliding plate assembly located between the two valve bodies, the transfer mechanism is configured to transfer the first sliding plate assembly into the space between the two valve bodies and to move the second sliding plate assembly out of the two valve bodies so that the first rupture membrane is moved into the flow channel.

[0033] In the third aspect, a first sliding plate assembly is provided for implementing hot replacement of a rupture disc, placed between two valve bodies located opposite each other and in a flow passage, and if the sliding plate assembly is located between the two valve bodies, the rupture disc provided in the sliding plate assembly is located within the flow passage for discharging the flow in the flow passage, wherein

[0034] the third sliding plate assembly comprises an integrated first rupture disc and an external first mating portion; and

[0035] After the fourth rupture disc is ruptured on the fourth sliding plate assembly located between the two valve bodies, the fourth mating portion of the fourth sliding plate assembly is releasably connected to the first mating portion, the fourth sliding plate assembly can be pulled out of the two valve bodies, and the first sliding plate assembly can be inserted into the space between the two valve bodies so that the first rupture disc is placed in the flow passage.

[0036] One part of the first and fourth mating parts is a protrusion, and the other part of the first fourth mating parts is a recess.

[0037] In one embodiment of the third aspect, the protrusion is a connecting bolt and the recess is a threaded hole.

[0038] In the fourth aspect, a mounting device for implementing hot replacement of a rupture disc is proposed, configured to install a sliding plate assembly between two valve bodies located opposite each other and in a flow passage, and when the sliding plate assembly is located between the two valve bodies, a rupture disc provided in the sliding plate assembly is located inside the flow passage to discharge the flow in the flow passage. The mounting device comprises:

[0039] a translation mechanism designed to move the support plate.

[0040] When the second sliding plate assembly is between the two valve bodies, and the rupture disk provided inside the second sliding plate assembly ruptures, the second sliding plate assembly is driven by the switching mechanism to move outward from the two valve bodies, and the first sliding plate assembly is driven by the switching mechanism to move into the space between the two valve bodies, as a result of which the rupture disk located inside the first sliding plate assembly will be moved into the flow passage.

[0041] In a fifth aspect, a pressure system for implementing hot replacement of a rupture disc is provided, comprising a flow passage, and a pressure relief device according to any of the previous aspects is installed in the flow passage.

[0042] In a sixth aspect, a pressure system for implementing a hot replacement of a rupture disc is provided, comprising a flow channel, and a first sliding plate assembly according to any of the previous aspects is located in the flow channel.

[0043] The present invention provides two sets of rupture discs in a "one in use, one in reserve" configuration. After one set of rupture discs ruptures, the operator simply operates the clamping mechanism to clamp and release that set of rupture discs. The other set of spare rupture discs can then be quickly and easily returned to the operating position without the use of any tools.

[0044] Regarding the essence of the invention, the present invention has at least the following advantageous technical effects.

[0045] The device proposed by this invention allows for a complete replacement of the existing rupture disc and offers advantages such as precise burst pressure, rapid response at a lower cost, high tightness, safety, and reliability. This not only solves a number of problems associated with replacing and backing up rupture discs in process pipelines but also significantly reduces production downtime, enabling rapid return to operation and achieving significant economic benefits.

[0046] Meeting standard burst pressure relief requirements, the device solves the problem of hot-swapping, thereby eliminating the time-consuming and labor-intensive process of removing and installing bolts and the time-consuming process of replacing the rupture disc. This significantly reduces production downtime caused by interrupted rupture disc replacement, reduces the safety risks associated with on-site rupture disc replacement, and improves production efficiency, among other benefits.

[0047] BRIEF DESCRIPTION OF DRAWINGS

[0048] FIG. 1 shows a view of a conventional rupture disc installed on a pipeline.

[0049] FIG. 2 shows a pressure relief device installed on a pipeline and designed to implement hot replacement of a rupture disc.

[0050] FIG. 3 is a front view of the overall structure of a pressure relief device for realizing hot replacement of a rupture disc.

[0051] FIG. 4 is a side view of the overall structure of a pressure relief device for realizing hot replacement of a rupture disc.

[0052] FIG. 5 shows a sectional view of the overall structure of a pressure relief device designed to implement hot replacement of a rupture disc.

[0053] FIG. 6 shows a general view of the sliding plate assembly.

[0054] FIG. 7 shows a cross-sectional view of the sliding plate assembly.

[0055] FIG. 8 is a view illustrating various states of the position recognition key.

[0056] FIG. 9 shows the appearance of a part of the position recognition key.

[0057] FIG. 10 schematically shows the connection of a connecting device containing a support plate.

[0058] FIG. 11 shows a sectional view of a connection of a connecting device containing a support plate.

[0059] FIG. 12 shows another sectional view of the connection of the connecting device containing the support plate.

[0060] Reference designations: 1 clamping mechanism; 2 first sliding plate assembly; 3 second sliding plate assembly; 4 connecting device; 5 transfer mechanism;

[0061] 101 valve body; 102 pipeline flange; 103 intermediate flange;

[0062] 104 first main drive shaft; 105 second main drive shaft; 106 first auxiliary drive shaft; 107 second auxiliary drive shaft; 108 shaft eccentric link; 109 crank; 110 crank joint; 111 left pressure block; 112 right pressure block;

[0063] 201 first upper holder; 202 first burst disc; 203 first lower holder; 204 connecting bolt; 205 first bolt; 206 limit plate; 207 lock nut; 208 upper sealing ring; 209 lower sealing ring; 210 positioning recognition key; 211 positioning pin; 212 first groove; 213 middle part; 214 thin part; 215 connecting hole;

[0064] 301 second upper holder; 302 second bursting disc; 303 second lower holder, 304 threaded hole; 305 second groove; 306 countersunk hole;

[0065] 501 Lifting frame; 502 Valve stem nut; 503 Valve stem; 504 Lifting flywheel; 505 Rolling bearing; 506 Bearing cap; 507 Fork journal;

[0066] 6 support plate; 61 mounting groove;

[0067] 7. ledge

[0068] DETAILED DISCLOSURE OF THE INVENTION

[0069] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments.

[0070] Embodiment 1

[0071] Embodiments of the present invention disclose a pressure relief device that implements hot replacement of a rupture disc. As shown in FIGS. 2-5, the pressure relief device comprises a flow channel, a clamping mechanism 1, a switching mechanism 5, a first sliding plate assembly 2, a second sliding plate assembly 3, and a connecting device 4.

[0072] The first sliding plate assembly 2 comprises the first rupture disc 202, and the second sliding plate assembly 3 comprises the second rupture disc 302. The flow channel is configured to discharge the flow and is formed by at least two valve bodies 101. The first rupture disc 202 or the second rupture disc 302 is located between the two valve bodies 101, that is, the first rupture disc 202 or the second rupture disc 302 is located within the flow channel. The connecting device 4 is releasably connected between the first sliding plate assembly 2 and the second sliding plate assembly 3. The clamping mechanism 1 is installed between the two valve bodies 101 and is configured to move the two valve bodies 101 towards or away from each other.The switching mechanism 5 is installed between the valve body 101 and the first unit 2 of the sliding plate and is configured to drive the first unit 2 of the sliding plate and the second unit 3 of the sliding plate in a direction perpendicular to the direction of the flow of the fluid inside the flow channel.

[0073] After the second rupture disc 302 located within the flow channel ruptures, the clamping mechanism 1 moves the two valve bodies 101 away from each other. After this, the switching mechanism 5 drives the first sliding plate assembly 2 and the second sliding plate assembly 3 so that the first rupture disc 202 is located in the flow channel. Then, the clamping mechanism 1 moves the two valve bodies 101 toward each other until the two valve bodies 101 are tightly clamped, and when the two valve bodies 101 are tightly clamped, a seal is formed between the two valve bodies 101 and the second sliding plate assembly 3.

[0074] Subsequently, if the environment in which the flow channel is located allows for the replacement of equipment, in particular, the first sliding plate assembly 2 can be disassembled, and a new first rupture disc 202 can be installed. If the environment in which the flow channel is located is not suitable for the replacement of equipment and other operations, the connection between the switching mechanism 5 and the first sliding plate assembly 2 can be disconnected, and the connection between the first sliding plate assembly 2 and the second sliding plate assembly 3, realized by the connecting device 4, can be disconnected. After this, the first sliding plate assembly 2 can be disassembled, a new first rupture disc 202 can be installed, and finally, the first sliding plate assembly 2 can be reconnected with the second sliding plate assembly 3 by the connecting device 4 and the switching mechanism 5.This allows for convenient replacement of the first bursting disc and the constant use of two bursting discs in the device, i.e. the main bursting disc and the backup bursting disc.

[0075] As shown in FIG. 5, the flow channel is formed by at least two valve bodies 101. The two valve bodies 101 have substantially the same shape. The end of each of the two valve bodies 101 is a pipeline flange 102, and the other end of each of the two valve bodies 101 is an intermediate flange 103 with a sealing surface. The pipeline flange 102 is configured to be connected to the pipeline flange of the system. The first sliding plate assembly 2 and the second sliding plate assembly 3 are located between the two intermediate flanges 103. When the clamping mechanism 1 tightly clamps the two valve bodies 101, a sealing pair is formed between the intermediate flange 103 of each of the two valve bodies 101 and the first sliding plate assembly 2 or the second sliding plate assembly 3.

[0076] As shown in FIG. 2, the clamping mechanism 1 is an eccentric drive mechanism, in particular, comprising a clamping block assembly, a first main drive shaft 104, a second main drive shaft 105, a first auxiliary drive shaft 106, a second auxiliary drive shaft 107, an eccentric shaft link 108, a crank 109 and a crank joint 110. The clamping block assembly comprises two left longitudinal clamping blocks 111 and two right longitudinal clamping blocks 112. The left clamping blocks 111 are located between the flange 102 of the pipeline of the left valve body 101 and the intermediate flange 103 of the left valve body 101. The right clamping blocks 112 are located between the flange 102 of the pipeline of the right valve body 101 and the intermediate flange 103 of the right valve body 101.The left pressure blocks 111 and the right pressure blocks 112 are pressed against the intermediate flange 103 of the left valve housing 101 and the intermediate flange 103 of the right valve housing 101 from both sides of the valve housings, respectively, and are connected to them. The two left pressure blocks 111 are connected in series by the vertically arranged first main drive shaft 104 and the second main drive shaft 105. The two right pressure blocks 112 are connected in series by the vertically arranged first auxiliary drive shaft 106 and the second auxiliary drive shaft 107. The first main drive shaft 104 and the second main drive shaft 105 are eccentric rods, and the first auxiliary drive shaft 106 and the second auxiliary drive shaft 107 are concentric rods.Each of the two ends of the first main drive shaft 104 and each of the two ends of the first auxiliary drive shaft 106 are respectively connected in series by two parallel eccentric shaft links, and each of the two ends of the second main drive shaft 105 and each of the two ends of the second auxiliary drive shaft 107 are respectively connected in series by two parallel eccentric shaft links. One end of the first main drive shaft 104 is connected to the drive mechanism, and the other end of the first main drive shaft 104 is connected to the second main drive shaft 105 by means of a crank link 110. The two ends of the crank connection 110 are attached to the crank 109 by means of shafts with pins. The crank 109 is mounted on a part of the main drive shaft located outside the eccentric shaft links. The two ends of the two main drive shafts and the two ends of the two auxiliary drive shafts are secured with cotter pins.

[0077] When an external force causes the end of the first main drive shaft 104 to rotate clockwise, the first main drive shaft 104 causes the second main drive shaft 105 to rotate by means of a crank connected to the first main drive shaft 104, the crank joint 110 and the crank are connected to the other end of the crank joint 110. The eccentric rotation of the first main drive shaft 104 and the second main drive shaft 105 forms an eccentricity in which four symmetrical eccentric shaft links pull the right valve body 101 to the left, and the distance between the left valve body 101 and the right valve body 101 continuously decreases. Therefore, the left valve body 101 and the right valve body 101 clamp the first sliding plate assembly 2 or the second sliding plate assembly 3, thereby providing a sealing action.

[0078] As shown in FIG. 2 and 5, the switching mechanism 5 includes a lifting frame 501, a valve stem nut 502, a valve stem 503, a lifting flywheel 504, rolling bearings 505, a bearing cap 506 and a journal 507 in a fork. The lifting frame 501 is mounted on an intermediate flange 103 of a valve body 101. The valve stem nut 502 includes a stop, and the rolling bearings 505 are located on both sides of the stop. The bearing cap 506 presses the rolling bearings 505, pressing the valve stem nut 502 to the lifting frame 501, as a result of which the valve stem nut 502 does not move in the axial direction and can only rotate. The upper section of the valve stem nut 502 is connected to a lifting handwheel 504 to rotate the valve stem nut 502. The valve stem nut 502 has an internal thread that matches the trapezoidal external thread of the valve stem 503. The valve stem 503 is moved up and down by rotating the valve stem nut 502.The lower end of the valve stem 503 is connected to the journal 507 in the fork. A groove is provided at the end of the journal 507 in the fork, the first lower holder 203 contains a connecting part, and the connecting part is inserted into the groove. The journal 507 in the fork and the first lower holder 203 are connected together by a bolt and a nut, that is, the bolt passes through the journal 507 in the fork and the connecting part, and the nut is threadedly connected to the end of the bolt. The journal 507 in the fork is connected to an indicator rod connected to the lifting frame 501 with the ability to move along the axial direction of the valve stem 503. Thus, the valve stem 503 drives the lifting frame and the sliding plates to move together upward or downward.

[0079] The first sliding plate assembly 2 and the second sliding plate assembly 3 are arranged perpendicular to the flow direction of the fluid in the flow channel, and the first sliding plate assembly 2 and the second sliding plate assembly 3 are arranged in the same plane. The first sliding plate assembly 2 is connected to the transfer mechanism 5 by bolts. When the flywheel rotates, the transfer mechanism 5 drives the first sliding plate assembly 2 and the second sliding plate assembly 3 in a direction perpendicular to the flow channel.

[0080] As shown in FIG. 6, the first sliding plate assembly 2 includes a first upper holder 201 and a first lower holder 203. The first rupture disc 202 is located between the first upper holder 201 and the first lower holder 203, and the first upper holder 201 is releasably connected to the first lower holder 203. The second sliding plate assembly 3 includes a second upper holder 301 and a second lower holder 303. The second rupture disc 302 is located between the second upper holder 301 and the second lower holder 303, and the second upper holder 301 is releasably connected to the second lower holder 303.

[0081] In particular, several first bolts 205 connect the first upper holder 201 with the first lower holder 203, and the second upper holder 301 with the second lower holder 303. Each of the first bolts 205 passes through the first and second upper holder through the countersunk hole 306 and is connected by a threaded connection with the first and second lower holders. Several first bolts 205 are evenly distributed along the edge of the first upper holder 201 and the edge of the second upper holder 301. The first upper holder 201, the first bursting disc 202 and the first lower holder 203 are pre-compressed with each other by the first bolts 205. Similarly, the second upper holder 301, the second bursting disc 302 and the second lower holder 303 are pre-compressed with each other by the first bolts 205. The first lower holder 203 and the second lower holder 303 are essentially identical.

[0082] The connecting device 4 is installed between the first lower holder 203 and the second lower holder 303.

[0083] In particular, the connecting device 4 may include a connecting bolt 204. The middle portions of the opposite surfaces of the first lower holder 203 and the second lower holder 303 include threaded holes 304. The two ends of the connecting bolt 204 are connected by a threaded connection with the threaded hole 304 of the first lower holder 203 and the threaded hole 304 of the second lower holder 303, respectively. Two lock nuts 207 are screwed onto the thread on the outside of the connecting bolt 204. After connecting the first lower holder 203 and the second lower holder 303 with the connecting bolt 204, the two lock nuts 207 are rotated until they are pressed against the first lower holder 203 and the second lower holder 303, respectively, thereby increasing the stability of the connection between the connecting bolt 204 and the first sliding plate assembly 2 and the second sliding plate assembly 3.

[0084] In addition, a positioning device is provided between the first sliding plate unit 2 and the second sliding plate unit 3, which ensures that the first sliding plate unit 2 and the second sliding plate unit 3 are positioned in the same plane.

[0085] As shown in FIGS. 8 and 9, the positioning device comprises a first groove 212, a second groove 305, and a positioning recognition key 210. The side of the first lower holder 203 facing the first rupture disc 202 contains the first groove 212. The side of the second lower holder 303 facing the second rupture disc 302 contains the second groove 305. One end of the position recognition key 210 is placed in the first groove 212, and the other end of the position recognition key 210 is placed in the second groove 305. The first groove 212 is located on the edge of the surface of the first lower holder 203 opposite the second lower holder 303, that is, between the position recognition key 210 and the connecting bolt 204 there is a large distance, which guarantees the positioning accuracy of the position recognition key 210 and facilitates the use of the position recognition key 210.

[0086] The first lower holder 203 has a hole for installing a positioning pin 211. At the end of the positioning recognition key 210, a connecting hole 215 is provided. The positioning pin 211 passes through the connecting hole 215, and the two ends of the positioning pin 211 are inserted into the first lower holder 203, thereby rotatably connecting the positioning recognition key 210 with the first lower holder 203. The positioning recognition key 210 comprises a middle portion 213 and thin portions 214 at both ends of the middle portion 213. The width of the middle portion 213 exceeds the width of each of the thin portions 214. The width of the middle portion 213 is equal to the installation distance between the first lower holder 203 and the second lower holder 303. The width of each thin portion 214 corresponds to the width of the first groove 212 and the second groove 305.If the installation distance between the first lower holder 203 and the second lower holder 303 corresponds, and the first lower holder 203 and the second lower holder 303 are in the same plane, the positioning recognition key 210 can be smoothly rotated into the second groove 305 of the opposite second lower holder 303. This prevents a situation in which the first lower holder 203 and the second lower holder 303 are not connected in place by the connecting bolt 204. The positioning recognition key 210 has a rectangular cross-section, which ensures the flatness of the lower holder during installation and the possibility of installing the first lower holder 203 and the second lower holder 303 in the same horizontal plane at an appropriate distance.

[0087] The connection between the first lower holder 203 and the second lower holder 303 according to the present invention can be made in embodiments other than the connection by the bolt 204.

[0088] For example, in particular, as shown in FIG. 10, the connecting device 4 may further comprise a support plate 6. The first lower holder 203 and the second lower holder 303 can be connected to the support plate 6 of a suitable size by bolts, respectively, so as to form an integrated structure. Sealing grooves are provided in both the upper and lower parts of the support plate 6, and the upper seal and the lower seal can be realized by adding sealing gaskets. The distance between the first lower holder 203 and the second lower holder 303 is fixed with bolts on the support plate 6. This solution is characterized by simplicity and convenience, high standardization of parts, and only requires additional sealing between the first lower holder, the second lower holder, and the support plate 6.

[0089] As shown in FIG. 12, the cross-section of the first lower holder 203 and the second lower holder 303 can also be changed compared to the annular shape in FIG. 11, and can have a T-shape as shown in FIG. 12. That is, the support plate 6 includes a mounting groove 61, and the side of the first lower holder 203 facing the support plate 6 and the side of the second lower holder 303 facing the support plate 6 include a projection 7 corresponding to the mounting groove. This is equivalent to adding a guide section between the lower holders and the support plate 6, which facilitates positioning and assembly, and eliminates the need for a seal between the lower holders and the support plate 6.

[0090] When connecting device 4 uses connecting bolt 204, compared with a snap-type connection, the loosening of connecting bolt 204 is practically not observed. When switching mechanism 5 jointly moves the first sliding plate assembly 2 and the second sliding plate assembly 3 to switch the rupture disc, the positioning accuracy of the rupture disc is improved.

[0091] As shown in FIG. 7, the first lower holder 203 and the second lower holder 303 are connected to the limit plate 206 by bolts. The end of the first lower holder 203 facing away from the second lower holder 303 is connected to the limit plate 206, and the end of the second lower holder 303 facing away from the first lower holder 203 is connected to the limit plate 206. When the clamping mechanism 1 is released and the rupture disc is switched, the first sliding plate assembly 2 and the second sliding plate assembly 3 are moved until the limit plate 206 contacts the side edge of the valve body 101, which indicates that the rupture disc is moved to the correct position that ensures smooth internal flow during rupture of the rupture disc and does not affect the emergency pressure release.

[0092] As shown in FIG. 7, the surface of the first upper holder 201 facing away from the first rupture disc 202 and the surface of the second upper holder 301 facing away from the second rupture disc 302 include an upper annular groove, and the first sealing ring is located in the upper annular groove. The surface of the first upper holder 203 facing away from the first rupture disc 202 and the surface of the second upper holder 303 facing away from the second rupture disc 302 include a lower annular groove, and the second sealing ring is located in the lower annular groove.When the clamping mechanism 1 moves the two valve bodies 101 toward each other, the first sliding plate assembly 2 or the second sliding plate assembly 3 forms a seal with the surfaces of the intermediate flanges 103 of the two valve bodies 101 by means of the first sealing ring and the second sealing ring, which eliminates the presence of hidden invisible sealing rings in the internal mechanism, and in the event of damage to the sealing ring, the first sliding plate assembly 2 and the second sliding plate assembly 3 can be pulled out, which is convenient for hot replacement of the sealing ring.

[0093] The first sealing ring and the second sealing ring may also be other types of seals, such as spiral wound gaskets, sealing blocks, non-metallic gaskets, metal gaskets, or combined double seals.

[0094] The first bursting disc 202 and the second bursting disc 302 may have a different shape, such as a straight arch shape or an inverted arch shape.

[0095] The first bursting disc 202 and the second bursting disc 302 have clear markings to ensure the correct installation direction.

[0096] In normal operation, the clamping mechanism 1 tightly clamps the first sliding plate assembly 2 or the second sliding plate assembly 3 to form a seal, and of the two bursting discs, one is in use and the other is kept in reserve.

[0097] The principle of implementing the proposed invention is as follows. When the second rupture disc 302, which is in operation, is ruptured, the drive handwheel of the clamping mechanism 1 is rotated to move the two valve bodies 101 away from each other and unlock the first sliding plate assembly 2. Then, the lifting handwheel of the transfer mechanism 5 is rotated to smoothly move the first sliding plate assembly 2 and the second sliding plate assembly 3 in a direction perpendicular to the flow channel. By moving the first sliding plate assembly 2 and the second sliding plate assembly 3, the ruptured second rupture disc 302 is pushed out, while the backup first rupture disc 202 is moved until the limiting plate on the side of the backup rupture disc comes into contact with the side edge of the valve body 101, which indicates that the backup first rupture disc 202 has been moved to the correct position.

[0098] The driving handwheel of the clamping mechanism 1 is driven in the reverse direction, causing the clamping mechanism 1 to clamp the second sliding plate assembly 3 to form a seal, thereby achieving the purpose of hot use of the backup rupture disc.

[0099] After completing the above steps, at the site where the first rupture disc 202 can be replaced, the first bolts 205 between the first upper holder 201 and the first lower holder 203 can be loosened, the first upper holder 201 and the first rupture disc 202 can be removed sequentially, and then a new first rupture disc 202 can be installed. The first upper holder 201, the new first rupture disc 202, and the first lower holder 203 can be screwed together with the first bolts 205, which also solves the problem of having one used and one spare rupture disc. Thus, hot replacement of the rupture disc is realized. At the site where the replacement of the bursting disc is not possible, the connecting bolt 204 and the lock nut 207 at the end of the connecting bolt 204 can be loosened, the positioning recognition key 210 can be raised by 90 degrees, and the first lower holder 203 can be disconnected from the switching mechanism 5, see FIG.8 for a detailed condition assessment. After this, the first sliding plate assembly 2 can be directly removed. After replacing the second rupture disc 302, the first sliding plate assembly 2 can be reinstalled, and the positioning recognition key 210 allows for checking the correct installation of the first sliding plate assembly 2.

[0100] According to the present invention, according to the requirements of the technological process at the installation site, two rupture discs can be set to different burst pressures, or one of the rupture discs can be replaced with a plug configured to shut off the pipeline after the rupture of the other rupture disc.

[0101] The working process according to the present invention is realized by manual control of the drive handwheel and the lifting handwheel, but other drive methods, in particular pneumatic, hydraulic or electric, may also be provided for automatic control.

[0102] Embodiment 2

[0103] A first sliding plate assembly 2 is installed between the two valve bodies 101 to implement hot-swappable rupture disc replacement. The two valve bodies 101 are positioned opposite each other and in the flow channel. When the sliding plate assembly 2 is positioned between the two valve bodies 101, the rupture disc provided in the sliding plate assembly 2 is positioned in the flow channel to discharge the flow in the flow channel.

[0104] In FIG. 6, the third sliding plate assembly 2 corresponds to the first sliding plate assembly 2, and the fourth sliding plate assembly 3 corresponds to the second sliding plate assembly 3. The third sliding plate assembly 2 comprises an integrated first rupture disc 202 and an external first mating portion. After the fourth rupture disc 302 ruptures in the fourth sliding plate assembly 3 between the two valve bodies 101, the fourth mating portion of the fourth sliding plate assembly 3 is releasably connected to the first mating portion. The releasable connection is intended to provide communication between the third sliding plate assembly 2 and the fourth sliding plate assembly 3. By “connection” is meant that the movement of the node 2 of the third sliding plate can lead to the movement of the fourth node 3 of the sliding plate, or the movement of the node 3 of the fourth sliding plate can lead to the movement of the node 2 of the third sliding plate.The fourth sliding plate assembly 3 can be extended outward from the two valve bodies 101, and the third sliding plate assembly 2 can be moved into the space between the two valve bodies 101, causing the first rupture disc 202 to be introduced into the flow channel. The first mating portion, or fourth mating portion, is a protrusion, and the corresponding first mating portion, or fourth mating portion, is a recess. The protrusion is a connecting bolt 204, and the recess is a threaded hole 304.

[0105] Embodiment 3

[0106] The mounting device for implementing hot replacement of a rupture disc is configured to install a sliding plate assembly between two valve bodies 101. The two valve bodies 101 are located opposite each other and in a flow channel. When the sliding plate assembly 2 is located between the two valve bodies 101, the rupture disc provided in the sliding plate assembly 2 is located within the flow channel to discharge the flow in the flow channel.

[0107] As shown in FIGS. 4 and 10, the mounting device comprises a support plate 6 and a transfer mechanism 5. The support plate 6 is configured to mount multiple sliding plate assemblies next to each other. The multiple sliding plate assemblies are a first sliding plate assembly 2 and a second sliding plate assembly 3. The transfer mechanism 5 is configured to move the support plate 6.When the second sliding plate assembly 3 is located between the two valve bodies 101, and the rupture membrane 302 provided inside the second sliding plate assembly 3 ruptures, the second sliding plate assembly 3 is driven by the switching mechanism to move outward from the two valve bodies 101, and the first sliding plate assembly 2 is driven by the switching mechanism to move into the space between the two valve bodies 101, as a result of which the rupture membrane 202 located inside the first sliding plate assembly 2 will be moved into the flow channel.

[0108] Embodiment 4

[0109] The pressure system for implementing hot replacement of the rupture disc includes a flow passage, and the pressure relief device disclosed above is installed in the flow passage.

[0110] Embodiment 5

[0111] The pressure system for implementing the hot replacement of the rupture disc includes a flow passage, and the first sliding plate unit 2 disclosed above is disposed in the flow passage.

[0112] Although the present invention has been disclosed in the preferred embodiments mentioned above, the present disclosure is not intended to limit the protected scope of the present invention. Anyone skilled in the art can make possible changes and modifications without deviating from the spirit and scope of the present invention. Therefore, the protected scope of the present invention is determined by the scope of the claims of the present invention.

Claims

1. A pressure relief device for implementing hot replacement of a rupture disc, installed in a flow relief position in a flow channel, which allows the pressure relief device to relieve the flow in the flow channel, and two valve bodies (101) located opposite each other in the flow relief position, wherein the pressure relief device comprises: a first sliding plate assembly (2) and a second sliding plate assembly (3), wherein the first sliding plate assembly (2) comprises a first rupture disc (202) and the second sliding plate assembly (3) comprises a second rupture disc (302); and if the second sliding plate assembly (3) is located between the two valve bodies (101), the second rupture disc (302) is located within the flow channel and the first sliding plate assembly (2) is located outside the two valve bodies (101), wherein the first sliding plate assembly (2) and the second sliding plate assembly (3) are detachably connected to each other, and after the second rupture membrane (302) ruptures, the second sliding plate assembly (3) is configured to move outward from the two valve bodies (101), and the first sliding plate assembly (2) is configured to move into the space between the two valve bodies (101) so that the first rupture membrane (202) is inserted into the flow channel.

2. The pressure relief device according to claim 1, further comprising a transfer mechanism (5) configured to move the second sliding plate assembly (3) outward from the two valve bodies (101).

3. A pressure relief device according to claim 1 or 2, wherein the first sliding plate assembly (2) comprises a first upper holder (201) and a first lower holder (203), the first rupture disc (202) is located between the first upper holder (201) and the first lower holder (203), and the first upper holder (201) is releasably connected to the first lower holder (203); wherein several first bolts (205) connect the first upper holder (201) with the first lower holder (203), each of several first bolts (205) passes through the first upper holder (201) and is connected by a thread to the first lower holder (203) and several first bolts (205) are evenly spaced.

4. A pressure relief device according to any one of paragraphs 1-3, further comprising a connecting device (4) releasably connected between the first lower holder (203) and the second lower holder (303); wherein the connecting device (4) comprises a connecting bolt (204), wherein a threaded hole (304) is provided in the first lower holder (203) and the second lower holder (303), respectively, wherein the two ends of the connecting bolt (204) are connected by thread to the threaded hole (304) of the first lower holder (203) and the threaded hole (304) of the second lower holder (303), respectively.

5. The pressure relief device according to claim 4, further comprising a positioning device located between the first sliding plate assembly (2) and the second sliding plate assembly (3), and the positioning device is configured to position the first sliding plate assembly (2) and the second sliding plate assembly (3) in the same plane.

6. The pressure relief device according to claim 5, wherein the positioning device comprises a positioning recognition key (210), the first lower holder (203) comprises a first groove (212), the second lower holder (303) comprises a second groove (305), and one end of the positioning recognition key (210) is placed in the first groove (212), and the other end of the positioning recognition key (210) is inserted into the second groove (305); wherein the positioning recognition key (210) has a rectangular cross-section; wherein at the end of the positioning recognition key (210) a connecting hole (215) is provided, the positioning device further comprises a positioning pin (211), wherein the positioning pin (211) passes through the connecting hole (215) and two ends of the positioning pin (211) are inserted into the first lower holder (203) so that the positioning recognition key (210) is connected to the first lower holder (203) with the possibility of rotation.

7. The pressure relief device according to claim 6, wherein the positioning recognition key (210) comprises a middle portion (213), a first end portion (214) and a second end portion; the first end portion (214) and the second end portion are located at two ends of the middle portion (213), respectively; the width of the middle portion (213) exceeds the width of the first end portion (214) and the width of the second end portion, the first end portion (214) comprises a first groove (212), the second end portion comprises a second groove (305), and the middle portion (213) comprises a gap between the first lower holder (203) and the second lower holder (303).

8. The pressure relief device according to claim 4, wherein the connecting device (4) comprises a support plate (6) and a first lower holder (203) and a second lower holder (303) are releasably connected to the support plate (6); wherein both the upper side of the support plate (6) and the lower side of the support plate (6) contain a sealing ring for realizing a seal between the support plate (6) and the valve body (101), a seal between the first lower holder (203) and the support plate (6), and a seal between the second lower holder (303) and the support plate (6); wherein the support plate (6) comprises a mounting groove (61), and the side of the first lower holder (203) facing the support plate (6) and the side of the second lower holder (303) facing the support plate (6) comprise a projection (7) corresponding to the mounting groove.

9. A pressure relief device according to any one of claims 3 to 8, wherein the side of the first lower holder (203) facing away from the second lower holder (303) comprises a limiting plate (206) and, if the limiting plate (206) contacts the valve body (101), the first rupture disc (202) is moved to the correct position; wherein the side of the first upper holder (201) facing away from the first bursting membrane (202) comprises the first sealing ring, and the surface of the first lower holder (203) facing away from the first bursting membrane (202) comprises a lower annular groove, and the second sealing ring is located in the lower annular groove, respectively providing a seal between the support plate (6) and the valve body (101) and a seal between the first lower holder (203) and the second lower holder (303).

10. A pressure relief device according to any one of paragraphs. 2-9, in which the switching mechanism (5) comprises a lifting frame (501), a valve stem nut (502), a valve stem (503), a trunnion (507) in a fork and a bolt; the lifting frame (501) is connected to one of the valve bodies (101) without the possibility of displacement; in the direction of movement of the sliding plate unit, the valve stem nut (502) is limited by the side of the lifting frame (501) and is configured to rotate relative to the lifting frame (501), an internal thread is provided inside the valve stem nut (502) that matches the external thread of the valve stem (503), and the valve stem (503) is driven axially by rotating the valve stem nut (502); the end of the valve stem (503) is connected to the journal (507) in the fork, the first unit (2) of the sliding plate is connected to the connecting part, and the bolt passes through the connecting part and the journal (507) in the fork to connect the journal in the fork to the first unit (2) of the sliding plate; wherein the pressure relief device further comprises a clamping mechanism (1), wherein the clamping mechanism (1) comprises a first main drive shaft (104), a second main drive shaft (105), a first auxiliary drive shaft (106), a second auxiliary drive shaft (107), a left clamping block (111), a right clamping block (112), an eccentric link (108) of the shaft and a crank joint (110); each of the two valve bodies (101) comprises an intermediate flange (103); the first main drive shaft (104) and the second main drive shaft (105) are located on two opposite sides of one of the two valve bodies (101), respectively, and on the side of the intermediate flange (103) of one of the two valve bodies (101) facing away from the other valve body (101); the left pressure block (111) is connected to the end of the first main drive shaft (104) and the end of the second main drive shaft (105);the first auxiliary drive shaft (106) and the second auxiliary drive shaft (107) are located on two opposite sides of the other valve body (101), respectively, and on the side of the intermediate flange (103) of the other of the two valve bodies (101), facing away from the first main drive shaft (104); each of the two ends of the first main drive shaft (104) and each of the two ends of the first auxiliary drive shaft (106) are connected by an eccentric link (108) of the shaft, each of the two ends of the second main drive shaft (105) and each of the two ends of the second auxiliary drive shaft (107) are connected by an eccentric link (108) of the shaft, one end of the first main drive shaft (104) is connected to the drive mechanism, and the other end of the first main drive shaft (104) is connected to the second main drive shaft (105) by means of a crank connection (110);a crank connection (110) is provided between the first main drive shaft (104) and the second main drive shaft (105), which allows the first main drive shaft (104) to rotate the second main drive shaft (105); and the first main drive shaft (104) and the second main drive shaft (105) are eccentric rods.

11. A pressure relief device for implementing hot replacement of a rupture disc, installed in a flow relief position in a flow channel, which allows the pressure relief device to relieve the flow in the flow channel, and two opposite valve bodies (101) located in the flow relief position, in which the pressure relief device comprises: a first sliding plate assembly (2) comprising a first rupture disc (202); a transfer mechanism (5), in which, after the rupture of the second bursting membrane (302) on the second unit (3) of the sliding plate, located between the two valve bodies (101), the transfer mechanism (5) is configured to transfer the first unit (2) of the sliding plate into the space between the two valve bodies (101) and to remove the second unit (3) of the sliding plate out of the two valve bodies (101) in such a way that the first bursting membrane (202) is moved into the flow channel.

Images