CN216812923U - Ethylene cracking valve with parallel three-rod type thrust loading and replacing device - Google Patents
Ethylene cracking valve with parallel three-rod type thrust loading and replacing device Download PDFInfo
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- CN216812923U CN216812923U CN202220378022.1U CN202220378022U CN216812923U CN 216812923 U CN216812923 U CN 216812923U CN 202220378022 U CN202220378022 U CN 202220378022U CN 216812923 U CN216812923 U CN 216812923U
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Abstract
An ethylene cracking valve with a parallel three-rod type thrust conversion device comprises a valve body, a valve plate assembly and a three-rod type thrust conversion device; the three-rod type thrust conversion device comprises a thrust conversion bracket, a driving rod, a compression rebounder, a first parallel rod, a second parallel rod, a third parallel rod and a wedge block; a pressure retraction elastic device is arranged in the thrust conversion bracket; the middle part of the press-retraction elastic device cannot be compressed, compression and rebound assemblies are respectively arranged on two sides of the middle part, two ends of the middle part are respectively connected with a second parallel rod and a driving rod, the compression and rebound assemblies on each side are respectively connected with a first parallel rod and a third parallel rod, the first parallel rod and the third parallel rod extend into the valve body to be connected with the large valve plate, the third parallel rod extends into the valve body to be connected with the large end of a wedge block below the large valve plate, and the upper surface of the wedge block is matched with the inclined surface of the lower surface of the small valve plate to be attached. The valve cavity can be used for observing and judging the running state of the valve and can be adjusted on line, and the problem of running blockage of the ethylene cracking gas valve is thoroughly solved.
Description
Technical Field
The utility model relates to the field of gate valves, in particular to an ethylene cracking valve with a parallel three-rod type thrust loading and replacing device.
Background
The cracking gas valve is one of key devices of the cracking furnace. The performance of the catalyst directly influences the safety of ethylene cracking production. In the past, a butterfly valve or a gate valve is mostly adopted for a cracking gas big valve and a coke cleaning valve for a cracking furnace of an ethylene device. The cracking gas butterfly valve has the advantages of strong thermal stress bearing capacity, small size, light weight, small seal abrasion and the like, but has larger pressure drop under the same specification and quicker valve plate erosion. The gate full-channel valve has small pressure drop, good sealing and more applications.
The ethylene device of domestic chemical enterprises generally adopts an imported Z & J company cracking air valve, the structure principle is an opening type parallel plate gate valve, an upper valve plate and a lower valve plate are opened by an internal wedge-shaped mechanism to press a valve body valve seat to realize closing position sealing, an expansion joint is arranged on a welded valve cage to realize opening position sealing, opening and closing actions are realized by a single inner push rod, a locking disc and a disc spring are arranged on the inner push rod inside the valve body, after the valve is closed in place, the valve cage is limited, the inner push rod continues to push a wedge block to open the valve plate. However, if the valve is closed, the resistance increases, so that the inner push rod and the valve cage move relatively to open the valve plate, which further causes the problems of difficult opening and closing, clamping stagnation, pulling damage to the sealing surface and the like, even the locking sleeve is cracked, the disc spring is cracked, and the clamping stagnation fault occurs during non-overhaul, so that the reason of the clamping stagnation cannot be observed from the outside, and the problems need to be solved through shutdown, disassembly and overhaul.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides the ethylene cracking valve with the parallel three-rod type thrust loading and replacing device, and by utilizing the parallel three-rod type thrust loading and replacing device, the running state of the valve can be observed and judged on the appearance of the valve cavity, the valve can be adjusted on line, and the problem of running blockage of the ethylene cracking gas valve is thoroughly solved.
In order to realize the technical purpose, the adopted technical scheme is as follows: an ethylene cracking valve with a parallel three-rod type thrust conversion device comprises a valve body, a valve plate assembly and a three-rod type thrust conversion device;
a valve cavity of the valve body is internally provided with a valve plate assembly, and the outer side of the valve body is provided with a three-rod type thrust conversion device;
the valve plate assembly is provided with a large valve plate and a small valve plate, the large valve plate is provided with an opening valve port and a closing valve port, the closing valve port is provided with the small valve plate which is matched with the opening valve port, and the lower surface of the small valve plate is an inclined surface;
the three-rod type thrust conversion device comprises a thrust conversion bracket, a driving rod, a compression rebounder, a first parallel rod, a second parallel rod, a third parallel rod and a wedge block; the first parallel rod, the second parallel rod and the third parallel rod are arranged in parallel, and a compression elastic device is arranged in the thrust conversion bracket; the middle part of the compression-retraction elastic device can not be compressed, compression and rebound assemblies are respectively arranged on two sides of the middle part, the two ends of the middle part are respectively connected with a second parallel rod and a driving rod, the compression and rebound assemblies on all sides are respectively connected with a first parallel rod and a third parallel rod, the first parallel rod and the third parallel rod extend into the valve body to be connected with the large valve plate, the third parallel rod extends into the valve body to be connected with the large end of a wedge block below the large valve plate, and the upper surface of the wedge block is attached to the inclined surface of the lower surface of the small valve plate in a matched manner.
The compression and rebound assembly comprises a pre-compressed elastic body and an elastic body compression hole for placing the elastic body, the first parallel rod and the third parallel rod penetrate through the elastic body and the elastic body compression hole on the side of the first parallel rod and the third parallel rod and are abutted against the compression and retraction elastic device through nuts, and the first parallel rod and the third parallel rod are provided with adjusting nuts for pre-compressing the elastic body on each side.
The front side of the adjusting nut is also provided with a pressing block used for increasing the contact between the adjusting nut and the elastic body.
The elastic body is a disc spring or a spring.
Guide rails are arranged on two sides of the support, and sliding grooves matched with the guide rails are respectively arranged on two sides of the compression rebounder.
And inner stuffing boxes are arranged between the first parallel rod, the second parallel rod and the third parallel rod and the valve body.
The middle part of the compression rebounder is provided with a through hole, and the second parallel rod and the driving rod are inserted into the through hole from two ends of the compression rebounder and are tightened through a locking nut.
The utility model has the beneficial effects that: the traditional reciprocating motion of the ethylene cracking valve is converted into the relative motion between the first parallel rod, the third parallel rod and the second parallel rod, the opening and closing of the large valve plate and the opening and closing of the small valve plate are achieved, the problem of operation blocking of a single push rod is thoroughly solved, the thrust conversion device is an independent component and is arranged outside the ethylene cracking valve, the working condition is normal temperature, the service life is long, and the thrust conversion device is an external adjustable structure and is convenient for online adjustment and observation. The parallel three-rod type thrust replacing device is simple to machine, safe and convenient, and even if the valve plate is abraded, the sealing performance of the valve plate is not influenced by abrasion, and the valve plate can be adjusted peripherally according to abrasion loss.
Drawings
FIG. 1 is a schematic view of the valve body structure of the present invention;
FIG. 2 is a schematic structural view of the parallel three-bar thrust changer of the present invention;
FIG. 3 is a schematic view of the compression rebounder of the present invention with the internal components removed;
FIG. 4 is a cross-sectional view of the large valve plate and wedge of the present invention in combination;
in the figure: 1. the thrust conversion device comprises a thrust conversion support, 2, a driving rod, 3, a compression and retraction elastic device, 4, a first parallel rod, 5, a second parallel rod, 6, a third parallel rod, 7, a valve opening limit, 8, a valve plate assembly, 9, a wedge-shaped block, 10, a valve cavity, 11, an inner filling box, 12, a valve body, 13, a three-rod type thrust conversion device, 101, a guide rail, 301, a locking nut, 302, a nut, 303, a buckle, 304, an elastic body, 305, a pressing block, 306, an adjusting nut, 307, a sliding chute, 801, a large valve plate, 802 and a small valve plate.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings and specific examples.
The utility model provides an ethylene cracking valve with three parallel rod thrust loading and unloading devices, including valve body 12, valve plate subassembly 8, three rod-type thrust conversion equipment 13, put valve plate subassembly 8 in the valve pocket 10 of valve body 12, the outside of valve body 12 is equipped with three rod-type thrust conversion equipment 13, through three rod-type thrust conversion equipment 13 to the push-and-pull of valve plate subassembly 8 in valve pocket 10, the realization is closed the valve or is opened the valve.
The valve plate assembly 8 is provided with a large valve plate 801 and a small valve plate 802, the large valve plate 801 is provided with an opening port and a closing port, the closing port is provided with the small valve plate 802 which is matched with the opening port, and the lower surface of the small valve plate 802 is an inclined surface. The shape of the valve body 12 is not limited, and it is only required to ensure that the valve body 12 can be closed or opened in the pulling process of the large valve plate 801.
The three-rod type thrust conversion device 13 converts the traditional push-pull reciprocating motion into the synchronous or relative motion of the first parallel rod, the third parallel rod and the second parallel rod in the valve body through the pressure retraction elastic device 3 to realize the motion requirements of opening, closing and opening the small valve plate, and thoroughly solves the problem of blocking of single-rod driving operation.
The three-rod type thrust loading and exchanging device comprises a thrust conversion support 1, a driving rod 2, a compression rebounding device 3, a first parallel rod 4, a second parallel rod 5, a third parallel rod 6 and a wedge block 9, wherein the compression rebounding device 3 is arranged in the thrust conversion support 1, the middle of the compression rebounding device 3 cannot be compressed, compression rebounding assemblies are arranged on two sides of the middle of the thrust conversion support respectively, two ends of the middle of the thrust conversion support are connected with the second parallel rod 5 and the driving rod 2 respectively, the compression rebounding assemblies on all sides are connected with the first parallel rod 4 and the third parallel rod 6 respectively, the first parallel rod 4 and the third parallel rod 6 extend into a valve body 12 to be connected with a large valve plate 801, the third parallel rod 6 extends into the valve body 12 to be connected with the large end of the wedge block 9 below the large valve plate 801, and the upper surface of the wedge block 9 is matched and attached to the lower surface inclined plane of the small valve plate 802. Through the synchronous motion of the first parallel rod 4 and the third parallel rod 6, the large valve plate 801 is pushed to a valve closing position, the first parallel rod 4 and the third parallel rod 6 cannot be pushed any more, the compression rebound assembly is stressed to be compressed, the second parallel rod 5 connected with the compression rebound assembly pushes the wedge-shaped block 9 to jack up the small valve plate 802 for secondary sealing, when a valve is opened, the driving rod 2 is pulled back, the second parallel rod 5 is pulled, the compression rebound assembly rebounds, and then the first parallel rod, the second parallel rod and the third parallel rod pull the large valve plate 801 together until the valve is opened.
The compression rebound assembly comprises a pre-compressed elastic body 304 and an elastic body compression hole for placing the elastic body 304, the first parallel rod 4 and the third parallel rod 6 penetrate through the elastic body 304 and the elastic body compression hole on the respective sides and are tightly pressed on the compression rebound device 3 through a nut 302, and an adjusting nut 306 for pre-compressing the elastic body 304 on each side is arranged on the first parallel rod 4 and the third parallel rod 6.
Thrust conversion support 1 is welding frame construction, for whole thrust conversion equipment's fixed atress frame, and both ends are dull and stereotyped, and the middle shaped steel welding of using is set for guide rail 101 in the middle of the shaped steel for lead compression resilior 3. Guide rails 101 are arranged on two sides of the thrust conversion bracket 1, sliding grooves 307 are arranged on two corresponding sides of the compression rebounder 3, and the guide rails 101 are arranged in the sliding grooves 307 on the corresponding sides in a matched mode. The pressing and retracting elastic device 3 moves in the thrust conversion bracket 1 through the sliding groove, and the guide rail plays a role in guiding and preventing rotation.
The compression and retraction elastic device 3 is used for processing a forged piece and is provided with at least three parallel shaft holes, one side of a middle hole is connected with the second parallel rod 5, the other side of the middle hole is connected with the driving rod 2, and elastic body compression holes on the outer side are uniformly and symmetrically arranged and used for placing the elastic bodies 304. The elastic body 304 is a disc spring or a spring.
Taking a disc spring group as an example, the disc spring group is arranged in an elastic body compression hole on the outer side edge of the compression resilient device 3, a square buckle 303 is arranged in a middle hole, the buckle 303 can fixedly connect the second parallel rod 5 and the driving rod 2, and the locking can be further performed through a locking nut 301. The pressing block 305 is arranged in front of the adjusting nut 306 capable of adjusting the precompression of the disc spring set to increase the contact area of the adjusting nut, so that the compressing is convenient, and the first parallel rod 4 and the third parallel rod 6 are provided with external threads matched with the adjusting nut 306. The disc spring group adjusts the set urging force of the retracting missile 3 by adjusting the nut 306 and the pressing piece 305. The synchronous action of the first parallel rod 4 and the third parallel rod 6 in the valve closing process can be ensured by adjusting the disc spring group in an on-line way to enable the disc spring group load to be larger than the valve resistance. The disc spring groups are respectively arranged on the first parallel rod 4 and the second parallel rod 6 and are guided by the three parallel rods.
One end of the first parallel rod 4 and one end of the second parallel rod 5 are provided with threaded sections which extend into the compression and retraction elastic device 3, and the other ends are connected with a large valve plate 801 in the valve cavity. In the process from valve opening to valve closing of the valve, the driving rod 2 drives the compression rebounder to drive the first parallel rod 4 and the third parallel rod 6 to push the large valve plate to move together, the second parallel rod 5 drives the compression rebounder to move together with the first parallel rod 4 and the second parallel rod 5, when the valve reaches a closed position, the large valve plate tightly pushes the limiting device 16 in the valve cavity, and the large valve plate stops moving.
And after reaching the closed position, the driving rod 2 continues to move, further compresses the disc spring group, further drives the second parallel rod 5 to move forwards, and pushes the wedge-shaped block 9 to jack the small valve plate 802 to realize secondary sealing.
The first parallel rod 4, the second parallel rod 5 and the third parallel rod 6 are sealed with the valve body through an inner stuffing box 11 welded on the valve body.
The buckle 303 is square, has a threaded hole in the middle, and consists of an upper part and a lower part, and the upper part and the lower part are provided with four through holes around and fastened through bolts and nuts.
The disc spring group is formed by folding a plurality of disc springs, and can meet the requirements of load and displacement during valve closing and opening.
When the thrust is smaller than the thrust set by the compression and retraction elastic device 3, the compression and retraction elastic device 3 drives the first parallel rod 4 and the third parallel rod 6 to push the large valve plate 801 to move to the closed position, and sealing is realized. When the thrust is greater than the set thrust of the compression rebound elastic device 3, the first parallel rod 4 and the third parallel rod 6 are not moved, the actuator drives the compression rebound elastic device 3 to compress a disc spring group in a compression rebound assembly, so that the second parallel rod 5 is driven to move, the second parallel rod 5 moves to drive the wedge-shaped block 9 to move, the small valve plate 802 internals are tightly pushed against, and secondary forced sealing is realized.
The thrust force conversion device for an ethylene cracking valve provided by the present invention is described in detail above, and the principle and the specific embodiment of the present invention are explained herein by using specific examples, which are only used to help understand the method and the core idea of the present invention. It should be noted that any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protective scope of the present invention to those skilled in the art.
Claims (7)
1. An ethylene cracking valve with a parallel three-rod thrust switching device is characterized in that: comprises a valve body (12), a valve plate assembly (14) and a three-rod thrust conversion device (13);
a valve plate assembly (14) is arranged in a valve cavity of the valve body (12), and a three-rod type thrust conversion device (13) is arranged on the outer side of the valve body (12);
the valve plate assembly (14) is provided with a large valve plate (141) and a small valve plate (142), the large valve plate (141) is provided with an opening valve port and a closing valve port, the closing valve port is provided with the small valve plate (142) which is matched with the opening valve port, and the lower surface of the small valve plate (142) is an inclined surface;
the three-rod type thrust conversion device (13) comprises a thrust conversion bracket (1), a driving rod (2), a compression rebounder (3), a first parallel rod (4), a second parallel rod (5), a third parallel rod (6) and a wedge block (9); the first parallel rod (4), the second parallel rod (5) and the third parallel rod (6) are arranged in parallel, and a compression-retraction elastic device (3) is arranged in the thrust conversion bracket (1); the middle part of the press-retraction elastic device (3) cannot be compressed, the two sides of the middle part are respectively compression rebound assemblies, the two ends of the middle part are respectively connected with a second parallel rod (5) and a driving rod (2), the compression rebound assemblies on all sides are respectively connected with a first parallel rod (4) and a third parallel rod (6), the first parallel rod (4) and the third parallel rod (6) extend into the valve body (12) to be connected with the large valve plate (141), the third parallel rod (6) extends into the valve body (12) to be connected with the large end of a wedge block (9) below the large valve plate (141), and the upper surface of the wedge block (9) is matched and attached to the inclined surface of the lower surface of the small valve plate (142).
2. An ethylene cracking valve with a parallel three-rod thrust changer as set forth in claim 1, wherein: the compression rebound assembly comprises a pre-compressed elastic body (304) and an elastic body compression hole for placing the elastic body (304), the first parallel rod (4) and the third parallel rod (6) penetrate through the elastic body (304) and the elastic body compression hole on the corresponding side and are pressed against the compression retraction elastic device (3) through the nut (302), and the first parallel rod (4) and the third parallel rod (6) are provided with adjusting nuts (306) for pre-compressing the elastic body (304) on the corresponding side.
3. An ethylene cracking valve with a parallel three-rod thrust changer as set forth in claim 2, wherein: the front side of the adjusting nut (306) is also provided with a pressing block (305) used for increasing the contact area of the brick and the elastic body (304).
4. An ethylene cracking valve with a parallel three-rod thrust changer as set forth in claim 2, wherein: the elastic body (304) is a disc spring or a spring.
5. An ethylene cracking valve with a parallel three-rod thrust changer as set forth in claim 1, wherein: guide rails (101) are arranged on two sides of the support, and sliding chutes (307) matched with the guide rails (101) are respectively arranged on two sides of the pressing and retracting ejector (3).
6. An ethylene cracking valve with a parallel three-rod thrust changer as set forth in claim 1, wherein: an inner stuffing box (11) is arranged between the first parallel rod (4), the second parallel rod (5) and the third parallel rod (6) and the valve body (12).
7. An ethylene cracking valve with a parallel three-rod thrust changer as set forth in claim 1, wherein: a through hole is formed in the middle of the compression rebound device (3), and the second parallel rod (5) and the driving rod (2) are inserted into the through hole from two ends of the compression rebound device (3) and are tightened through a locking nut (301).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220378022.1U CN216812923U (en) | 2022-02-24 | 2022-02-24 | Ethylene cracking valve with parallel three-rod type thrust loading and replacing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220378022.1U CN216812923U (en) | 2022-02-24 | 2022-02-24 | Ethylene cracking valve with parallel three-rod type thrust loading and replacing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216812923U true CN216812923U (en) | 2022-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220378022.1U Active CN216812923U (en) | 2022-02-24 | 2022-02-24 | Ethylene cracking valve with parallel three-rod type thrust loading and replacing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216812923U (en) |
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2022
- 2022-02-24 CN CN202220378022.1U patent/CN216812923U/en active Active
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