A multi-link transmission mechanism of an oversized valve

Abstract

The utility model discloses a kind of multi-connecting rod drive mechanisms of super-large specification valve, including electric device and valve body, electric device is installed on electric mounting support by support frame, and electric mounting support is fixedly installed on valve body;The output shaft of electric device is connected with shaft one by key one;Shaft one is connected with shaft two by coupling assembly, and shaft two is connected with shaft three by coupling assembly;Shaft one and shaft three are respectively equipped with driving shaft rotary arm, and each driving shaft rotary arm is fixed in circumferential direction by key connection with corresponding shaft, and axial positioning is realized by axial positioning structure;Driving shaft rotary arm is hinged with one end of long connecting rod, and the other end of long connecting rod is hinged with bending rotary arm, and bending rotary arm is installed on vane shaft;Driving shaft rotary arm, long connecting rod and bending rotary arm constitute connecting rod drive mechanism for transmitting the rotation of shaft one and shaft three to vane shaft.The utility model solves the problems of existing technology, such as complex control, poor synchronism, installation limitation and the like.

Description

Technical Field

[0001] This utility model belongs to the field of nuclear power valve technology and relates to a multi-link transmission mechanism for ultra-large valves. Background Technology

[0002] Multi-link valves are a common valve structure, typically employing a multi-axis, multi-blade design. Multiple drive shafts are connected to a linkage mechanism, driving the remaining driven shafts to move synchronously, achieving coordinated control of the blades. This structure is widely used under normal operating conditions, effectively meeting the system's requirements for flow regulation and airflow control. However, with increasingly demanding operating conditions, especially in nuclear power plant ventilation valves, traditional designs are no longer sufficient to meet the demands of large-scale development. Currently, the mainstream solution for ultra-large valves is to assemble two or four valves, each equipped with an independent electric drive. While this multi-drive assembly structure can meet the installation requirements of large-size pipelines to some extent, it presents several problems in practical applications. These assembled valves require a centralized electrical control box or cabinet to coordinate the operation of multiple electric actuators. However, in some nuclear power plant buildings, due to space constraints or limited electrical configuration, it is often impossible to install centralized control equipment. Secondly, achieving complete synchronization between multiple drive actuators is difficult, easily leading to asynchronous valve opening and closing, which in turn causes problems such as unstable airflow, flow fluctuations, and pressure instability within the pipeline, and in severe cases, may even affect the normal operation of the entire system.

[0003] Therefore, in the face of the higher requirements for ultra-large valves in fields such as nuclear power, there is an urgent need for a new type of valve design with structural innovation and unified drive. Summary of the Invention

[0004] To achieve the above objectives, this utility model provides a multi-link transmission mechanism for ultra-large valves, which solves the problems of complex control, poor synchronization, and limited installation in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a multi-link transmission mechanism for an ultra-large valve, including an electric actuator and a valve body. The electric actuator is mounted on an electric actuator bracket via a support frame, and the electric actuator bracket is fixedly mounted on the valve body. The output shaft of the electric actuator is connected to a shaft via a key. Shaft 1 is connected to shaft 2 via a coupling assembly, and shaft 2 is connected to shaft 3 via a coupling assembly. A drive shaft pivot arm is mounted on shaft 1 and shaft 3 respectively. Each drive shaft pivot arm is circumferentially fixed to its corresponding shaft via a key connection and axially positioned via an axial positioning structure. One end of the drive shaft pivot arm is hinged to a long connecting rod, and the other end of the long connecting rod is hinged to a bending pivot arm, which is mounted on the blade shaft. The drive shaft pivot arm, the long connecting rod, and the bending pivot arm constitute a linkage transmission mechanism for transmitting the rotation of shaft 1 and shaft 3 to the blade shaft.

[0006] Furthermore, the coupling assembly includes a first coupling and a second coupling that are mated together. The first coupling and the second coupling are respectively connected to an adjacent shaft via a second key and are fixed together by a fastener assembly.

[0007] Furthermore, the fastener assembly includes a second bolt, a second locking nut, a third elastic washer, and a third flat washer; the second bolt passes through the through holes of the first and second couplings and is fastened to the second locking nut, and the third elastic washer and the third flat washer are fitted onto the second bolt.

[0008] Furthermore, the axial positioning structure includes a shoulder and a locking nut, which axially positions the drive shaft arm and tightly fits against the mounting surface of the valve body.

[0009] Furthermore, the hinge between the long connecting rod and the bending arm is achieved through a hinge assembly; the hinge assembly includes a bolt, a lock nut, an elastic washer, and a flat washer; the bolt passes through the holes in the long connecting rod and the bending arm and is fastened to the lock nut, and the elastic washer and flat washer are fitted onto the bolt.

[0010] Furthermore, the blade shaft is a segmented design, with the ends of each segment of the blade shaft supported in a bearing housing by bearings, and the bearing housing is equipped with a self-lubricating bushing.

[0011] Furthermore, the first, second, and third shafts are supported on the valve body's bracket system by bearings; the bracket system includes an L-shaped bracket and an intermediate bracket.

[0012] Furthermore, the bearing's sealing portion is equipped with a dustproof plate and an O-ring seal, and the bearing cover is tightened with fasteners to press the dustproof plate and O-ring seal together to form a sealing structure.

[0013] Furthermore, the sealing structure is equipped with an oil plug; the O-ring is made of radiation-resistant silicone rubber.

[0014] Furthermore, two sets of long connecting rods and bending arm assemblies with opposite directions are symmetrically arranged on the outer side of the valve body, which are driven by shaft one and shaft three respectively.

[0015] The beneficial effects of this utility model are: 1. This utility model is an integral valve structure, not a multi-valve body assembly. A central frame is provided in the middle of the valve body for mounting a central bearing seat. The blade shafts are disconnected in the middle and supported at the ends in the bearing seat, equipped with self-lubricating bushings, requiring no oiling and ensuring flexible operation. The valve is driven by only one electric device: on one hand, the drive shaft arm and long connecting rod drive each blade shaft on one side to rotate; on the other hand, drive shaft one and two sets of couplings sequentially drive shaft two and shaft three, and another drive shaft arm and long connecting rod drive the blade shafts on the opposite side. Both sides of the blades rotate synchronously in the same direction, ensuring stable airflow and avoiding airflow disturbances caused by asynchrony.

[0016] 2. This utility model adds a dustproof plate and an O-ring to the middle support section, which are set between the outer side of the support and the bearing cover to effectively prevent dust from entering the bearing, avoid the obstruction of operation caused by foreign objects, and extend the service life. The O-ring is made of radiation-resistant silicone rubber, which is suitable for special environments such as nuclear power plants, ensuring sealing performance and long-term reliability.

[0017] 3. This utility model adopts a three-section shaft structure, with each section equipped with a bracket and bearing support (including L-shaped brackets on both sides and a middle bracket), effectively ensuring the overall structural stability; the shaft sections are connected by keys to achieve a clearance-free fit, reduce assembly errors, and prevent performance degradation during torque transmission; this design avoids the difficulties in production, transportation, processing, installation, and process implementation caused by using a single continuous shaft for ultra-large valves, and at the same time solves the problem of a significant decrease in output torque due to excessive shaft length. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is the main view of the overall structure of this utility model.

[0020] Figure 2 This is a side view of the valve's actuator side.

[0021] Figure 3 This is a partial structural diagram of the electric actuator, electric actuator bracket, valve body, and linkage transmission mechanism.

[0022] Figure 4 This is a schematic diagram of the key connection structure at the coupling between shaft one and shaft two.

[0023] Figure 5 This is a partial structural diagram of the intermediate support.

[0024] In the diagram, 1. Electric actuator, 2. Key 1, 3. Electric actuator bracket, 4. Shaft 1, 5. Drive shaft swing arm, 6. L-shaped bracket, 7. Valve body, 8. Coupling 1, 9. Key 2, 10. Coupling 2, 11. Intermediate bracket, 12. Self-lubricating bushing, 13. Blade, 14. Blade shaft, 15. Bending swing arm, 16. Bolt, 17. Locking nut, 18. Elastic washer 1, 19. Flat washer 1, 20. Long connecting rod, 21. Bolt 1, 22. Locking nut 1, 23. Elastic washer 2, 24. Flat washer 2, 25. Dustproof plate, 26. O-ring seal, 27. Bearing cover, 28. Bearing, 29. Oil plug, 30. Bolt 2, 31. Locking nut 2, 32. Elastic washer 3, 33. Flat washer 3, 34. Shaft 2, 35. Shaft 3. Detailed Implementation

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

[0026] This utility model provides a multi-link transmission mechanism for an ultra-large valve, the structure of which is as follows: Figure 1-5 As shown, the device includes an electric actuator 1 and a valve body 7. The electric actuator 1 is mounted on an electric actuator bracket 3 via a support frame, and the support frame is fastened to the electric actuator bracket 3 with bolts. The electric actuator bracket 3 is fixedly mounted on the valve body 7 with bolts, thereby supporting and fixing the electric actuator 1. The shaft 4 of the valve body 7 passes through the support hole of the electric actuator bracket 3 and the output shaft hole of the electric actuator 1 in sequence, and is connected to the output shaft of the electric actuator 1 via a key 2. The electric actuator 1 then transmits torque to the shaft 4 and drives the shaft 4 to rotate.

[0027] Shaft 4 is connected to shaft 34 via coupling 8 and coupling 10. Shaft 4 is connected to coupling 8 via key 9, and shaft 34 is connected to coupling 10 via another key 9. Couplings 8 and 10 are fitted together at the connection between shaft 4 and shaft 34, achieving a transmission connection and torque transfer between the two shafts. Bolt 30 passes through the through holes in couplings 8 and 10, and its threaded end is screwed into lock nut 31, tightening the mating surfaces of the two couplings. Elastic washer 32 and flat washer 33 are respectively fitted onto bolt 30 and positioned between lock nut 31 and the contact surface of the coupling. Flat washer 33 is used for... The pressure is distributed, and the elastic washer 32 is used to prevent the nut from loosening. The connection structure formed by bolt 2 30, locking nut 2 31, elastic washer 32, and flat washer 33 ensures a reliable connection of the coupling, thereby ensuring that shaft 1 4 and shaft 2 34 can rotate synchronously and stably for a long time under vibration conditions. Shaft 2 34 is connected to shaft 3 35 through another set of identical connecting components, which includes key 2 9, coupling 1 8, coupling 2 10, bolt 2 30, locking nut 2 31, elastic washer 32, and flat washer 33. The connection method, assembly relationship, and function of shaft 2 34 and shaft 3 35 are the same as those of shaft 1 4 and shaft 2 34, so that shaft 3 35 rotates synchronously with shaft 2 34 and electric device 1. The above-mentioned connection structures for connecting shaft 1 4 and shaft 2 34, and shaft 2 34 and shaft 3 35, together constitute the coupling assembly of this utility model.

[0028] Two sets of long connecting rods 20 and bent rotating arms 15 assemblies with opposite directions are symmetrically arranged on the outer side of the valve body 7; a drive shaft rotating arm 5 is mounted on the shaft 4; the drive shaft rotating arm 5 is circumferentially fixed to the shaft 4 through a key connection to transmit torque, and is axially positioned by the engagement of the shaft shoulder and the locking nut; the axial positioning structure firmly fixes the drive shaft rotating arm 5 and ensures that its outer end face is in close contact with the corresponding mounting surface of the valve body 7; one end of the drive shaft rotating arm 5 is hinged to one end of the long connecting rod 20; the other end of the long connecting rod 20 is hinged to the bent rotating arm 15 mounted on the blade shaft 14; when the shaft 4 rotates, it drives the main shaft 15 through the key connection. The driving shaft rotating arm 5 rotates synchronously; the rotation of the driving shaft rotating arm 5 is converted into planar motion of the long connecting rod 20 through the hinge point at its end; the other end of the long connecting rod 20 pushes the bending rotating arm 15 through the hinge point, causing the bending rotating arm 15 to rotate horizontally around the axis of the blade shaft 14, thereby ultimately driving the blade 13 to open the valve; at the same time, the torque of shaft 1 4 is transmitted to shaft 2 34 through coupling 1 8 and coupling 2 10, and then to shaft 3 35 through the same coupling assembly; shaft 3 35 is equipped with the driving shaft rotating arm 5 in the same way, and drives the other side (such as) through the long connecting rod 20. Figure 1The bending arm 15 and blade shaft 14 (in the P direction) rotate clockwise, thereby driving the blade 13 on that side to open synchronously; all the blades 13 of the entire valve body 7 achieve strictly synchronous and opposite coordinated rotation under the drive of the electric device 1, jointly completing the stable opening and closing operation of the valve, effectively ensuring the consistency and reliability of the valve action.

[0029] The valve body 7 has a central frame for mounting a central bearing housing. The blade shaft 14 is segmented and broken at the central frame. The ends of each segment of the blade shaft 14 are supported in their respective bearing housings by their bearings to achieve reliable positioning and radial support. The bearing housing is equipped with a self-lubricating bushing 12, which does not require an external lubrication system, ensuring that the support part of the blade shaft 14 maintains a flexible and low-resistance operating state for a long time. Shaft 1 4, shaft 2 34, and shaft 3 35 are supported on the support system carried by the valve body 7 by bearings 28. The support system includes L-shaped supports 6 distributed on both sides of the valve body 7 and a central support 11 fixed on the central frame, which together provide stable and reliable radial and axial constraints for each shaft segment, thereby ensuring the rigidity and operational stability of the overall transmission structure. Shaft 1 4, shaft 2 34, and shaft 3 35 are connected by a key to achieve a clearance-free fit. This connection method can effectively reduce assembly errors and avoid performance loss caused by clearance during torque transmission.

[0030] Furthermore, the hinge assembly between the long connecting rod 20 and the bending arm 15 includes a bolt 16, a locking nut 17, an elastic washer 18, and a flat washer 19. The bolt 16 passes through the connecting hole at the end of the long connecting rod 20 and the mounting hole on the bending arm 15 in sequence, and is fitted with the flat washer 19 and the elastic washer 18. Finally, it is tightened by the locking nut 17, thereby effectively ensuring the tightness and reliability of the connection structure between the long connecting rod 20 and the bending arm 15. In this embodiment, the bolt 16 is an M12×70 bolt, and the locking nut 17 is an M12 nut.

[0031] Furthermore, a dustproof plate 25 and an O-ring seal 26 are added to the sealing part of the bearing 28 of the intermediate bracket 11. The dustproof plate 25 is installed on the outside of the intermediate bracket 11, and the O-ring seal 26 is placed between the dustproof plate 25 and the bearing cover 27. The bearing cover 27 is tightened and fixed by a set of fasteners. The set of fasteners includes a bolt 21, a lock nut 22, an elastic washer 23, and a flat washer 24. During assembly, the bolt 21 is inserted from the outside of the bearing cover 27, and the flat washer 24 and the elastic washer 23 are put on in sequence. Finally, it is screwed into the threaded hole of the intermediate bracket 11 and locked by the lock nut 22. After tightening, the bearing cover 27 reliably presses the O-ring 26 and the dustproof plate 25 onto the intermediate bracket 11 through the fasteners, forming an effective sealing structure. This sealing structure is equipped with an oil plug 29, which can effectively prevent dust from entering the interior of the bearing 28 and avoid operational jamming caused by foreign object intrusion. Regularly adding grease through the oil plug 29 can extend the service life of the bearing 28. Among them, the O-ring 26 is made of radiation-resistant silicone rubber, which can adapt to special working environments such as nuclear power plants, ensuring its sealing performance and durability.

[0032] The working principle of this utility model is as follows: The extra-large valve adopts an integral valve body structure and is driven by an electric device 1. Its output shaft drives shaft 4 to rotate via a key connection, and then transmits torque to shafts 34 and 35 sequentially through a coupling assembly, realizing multi-axis synchronous linkage. Each shaft segment is supported by bearings 28 and a bracket system to ensure structural rigidity and stability. Shafts 4, 34, and 35 are fitted together with keys to achieve a clearance-free fit, effectively reducing assembly errors and avoiding torque loss. The drive shaft arm 5 on each shaft segment drives the bending arm 15 and the blade shaft 14 to move via a long connecting rod 20, thereby driving the blades 13 on both sides. The valves rotate in opposite directions to achieve stable opening and closing and promote stable gas flow. The blade shaft 14 adopts a segmented design, with the middle part supported in a bearing housing equipped with a self-lubricating bushing 12, eliminating the need for external oiling and allowing for flexible operation. The intermediate support 11 is equipped with a dustproof plate 25 and an O-ring 26 made of radiation-resistant silicone rubber, which can effectively prevent dust and seal the shaft, adapting to special working conditions such as nuclear power. Lubricating grease can be added through the oil plug 29 to further extend the life of the bearing 28. The three-section split shaft design effectively solves the problems of manufacturing, transportation, installation and torque transmission of the overall long shaft, combining structural rationality and transmission efficiency.

[0033] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A multi-link transmission mechanism for an ultra-large valve, comprising an electric actuator (1) and a valve body (7), characterized in that: The electric device (1) is mounted on the electric device bracket (3) via a support frame, and the electric device bracket (3) is fixedly mounted on the valve body (7); the output shaft of the electric device (1) is connected to the shaft (4) via a key (2); The first shaft (4) is connected to the second shaft (34) through a coupling assembly, and the second shaft (34) is connected to the third shaft (35) through a coupling assembly. The first shaft (4) and the third shaft (35) are respectively equipped with drive shaft arms (5). Each drive shaft arm (5) is circumferentially fixed to the corresponding shaft through a key connection and axially positioned through an axial positioning structure. The drive shaft arm (5) is hinged to one end of the long connecting rod (20), and the other end of the long connecting rod (20) is hinged to the bending arm (15). The bending arm (15) is installed on the blade shaft (14). The drive shaft arm (5), the long connecting rod (20) and the bending arm (15) constitute a linkage transmission mechanism for transmitting the rotation of the first shaft (4) and the third shaft (35) to the blade shaft (14).

2. The multi-link transmission mechanism for an ultra-large valve according to claim 1, characterized in that, The coupling assembly includes a first coupling (8) and a second coupling (10) that are coupled together. The first coupling (8) and the second coupling (10) are respectively connected to the adjacent shafts by a second key (9) and are fixed by a fastener assembly.

3. The multi-link transmission mechanism for an ultra-large valve according to claim 2, characterized in that, The fastener assembly includes bolt two (30), lock nut two (31), elastic washer three (32) and flat washer three (33); bolt two (30) passes through the through holes of coupling one (8) and coupling two (10) and is fastened to lock nut two (31); elastic washer three (32) and flat washer three (33) are fitted on bolt two (30).

4. The multi-link transmission mechanism for an ultra-large valve according to claim 1, characterized in that, The axial positioning structure includes a shoulder and a locking nut, which axially positions the drive shaft arm (5) and makes it fit tightly against the mounting surface of the valve body (7).

5. The multi-link transmission mechanism for an ultra-large valve according to claim 1, characterized in that, The hinge between the long connecting rod (20) and the bending arm (15) is achieved by a hinge assembly; the hinge assembly includes a bolt (16), a locking nut (17), an elastic washer (18) and a flat washer (19); the bolt (16) passes through the holes of the long connecting rod (20) and the bending arm (15) and is fastened to the locking nut (17), and the elastic washer (18) and the flat washer (19) are fitted onto the bolt (16).

6. The multi-link transmission mechanism for an ultra-large valve according to claim 1, characterized in that, The blade shaft (14) is a segmented design, and the ends of each segment of the blade shaft (14) are supported in the bearing housing by bearings. The bearing housing is equipped with a self-lubricating bushing (12).

7. The multi-link transmission mechanism for an ultra-large valve according to claim 1, characterized in that, The first shaft (4), the second shaft (34) and the third shaft (35) are supported on the bracket system of the valve body (7) by bearings (28); the bracket system includes an L-shaped bracket (6) and an intermediate bracket (11).

8. The multi-link transmission mechanism for an ultra-large valve according to claim 7, characterized in that, The bearing (28) is provided with a dustproof plate (25) and an O-ring seal (26) at the sealing part. The bearing cover (27) is pressed with fasteners to form a sealing structure by pressing the dustproof plate (25) and the O-ring seal (26).

9. The multi-link transmission mechanism for an ultra-large valve according to claim 8, characterized in that, The sealing structure is provided with an oil plug (29); the O-ring (26) is made of radiation-resistant silicone rubber.

10. The multi-link transmission mechanism for an ultra-large valve according to claim 1, characterized in that, The valve body (7) has two sets of long connecting rods (20) and bending arm (15) assemblies arranged symmetrically on the outside, which are driven by shaft one (4) and shaft three (35) respectively.

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