Blade type anti-explosion wave valve with two-way ventilation protection function

Abstract

The utility model provides a two-way ventilation protection blade type anti-explosion wave valve, and aims to simplify a protection structure of an outdoor air port of a nuclear power station and improve the performance of the protection structure. The valve integrates the functions of rain prevention, shock wave resistance and flying object collision prevention, and is suitable for extreme environments. Bending and arc design is adopted for the blades, the bearing capacity and the deformation resistance are enhanced, and the opening angle is adjustable. Two-way ventilation is supported under normal conditions; in case of explosion, the device can be quickly closed to isolate shock waves, protect the safety in a building, and automatically reset without manual intervention. By means of the design, the large ventilation quantity is ensured, the device can adapt to the environment without electric power, safety and practicability are improved, and a reliable ventilation solution is provided for special occasions.

Description

Technical Field

[0001] This utility model belongs to the technical field of HVAC equipment and relates to a blade-type explosion-proof wave valve with bidirectional ventilation protection. Background Technology

[0002] In existing power plant designs, explosion-proof wave valves are typically installed inside or outside outdoor air vents to protect against the positive pressure generated by shock waves and the negative pressure generated by tornadoes. When instantaneous overpressure occurs, the explosion-proof wave valves can quickly close, isolating indoor and outdoor air, preventing the ventilation system from being impacted by instantaneous pressure waves, and ensuring the integrity of the ventilation system pipelines and equipment.

[0003] The existing protective devices for outdoor air vents in nuclear power plants are a combination of explosion-proof valves, anti-projectile facilities, and rainproof louvers to achieve effective protection. This system is complex and has poor resistance performance.

[0004] Currently available explosion-proof wave valves on the market are of two types. One type uses a single-sided spring and can only ventilate in one direction, meaning it only provides protection during the positive pressure phase of the shock wave. When a negative pressure situation occurs after an explosion, this type of valve can no longer provide protection, and it requires manual reset after an accident. Currently, explosion-proof wave valves on the market that can block shock waves in both directions generally have a smaller ventilation capacity. In special situations where there are internal and external explosion sources, the shock wave valve needs to have the ability to block shock waves in both directions, and the ventilation capacity per unit area needs to be very large. Furthermore, it needs to be able to close instantly under both positive and negative pressure conditions to provide protection.

[0005] Existing explosion-proof wave valves on the market have certain shortcomings. Some are rainproof but lack shock wave resistance, while valves that are shock wave resistant often lack rainproof features or do not have the function of protecting against tornado impacts. Therefore, to achieve effective protection, there is a need for an explosion-proof wave valve that is bidirectionally explosion-proof, bidirectionally resettable, bidirectionally ventilated, and integrates various protection functions for outdoor air vents.

[0006] The utility model discloses a patent for utility model with the publication number CN219866475U discloses a kind of blast wave valve, and valve body is provided with ventilation opening group, and each ventilation opening group is composed of outer ventilation opening in the front of valve body and inner ventilation opening in the back of valve body;Sealing rod and spring assembly are arranged between outer ventilation opening and inner ventilation opening, and spring assembly is located between the spring limiting plate in sealing rod and outer ventilation opening and between spring limiting plate and inner ventilation opening, solve the problem that existing blast wave valve cannot bidirectional anti-explosion and bidirectional ventilation.But the protection problem of outdoor air port is not involved in the patent, and a kind of bidirectional ventilation protection blade type blast wave valve provided by the application, in addition to bidirectional anti-explosion, bidirectional reset, bidirectional ventilation, also integrates each protection function of outdoor air port, can prevent rain, impact wave and protect tornado fly projectile impact.The adoption of bending and circular arc design of blast wave valve blade helps to improve the carrying capacity and deformation resistance of blade, and allows the opening angle of blade to be adjusted to adapt to different working condition requirements. Utility model content

[0007] In order to achieve the above purpose, the utility model provides a kind of bidirectional ventilation protection blade type blast wave valve, solve the problem that existing nuclear power station outdoor air port protection structure is complex, and poor resistance performance.

[0008] To solve the above technical problems, the utility model adopts the technical scheme of a kind of bidirectional ventilation protection blade type blast wave valve, characterized by comprising valve body frame, the valve body frame includes combined welding upper and lower frame and side frame, the upper and lower frame of valve body frame is welded with upper and lower valve seat in inside,

[0009] Valve body reinforcing rib is also welded and fixed on the upper and lower frame;

[0010] The side frame is respectively provided with a through shaft hole and is distributed in the mode of 2x2, the through shaft hole is concentric in horizontal direction both sides, and is on the same straight line in vertical direction;Shaft one and shaft two are respectively provided with 2 pieces, the shaft one is respectively horizontally passed through 2 groups of upper through shaft holes, and the shaft two is respectively horizontally passed through 2 groups of lower through shaft holes;

[0011] The through shaft hole of 2 pieces in the left lower side of side frame is provided with bearing end cover hole in the direction of horizontal included angle 30 °, and the through shaft hole of 2 pieces in the left upper side of side frame and the through shaft hole of 4 pieces in the right side of side frame are provided with bearing cover hole in the direction of horizontal included angle 30 °;The bearing end cover hole and bearing cover hole are also concentric in horizontal direction both sides, and are on the same straight line in vertical direction.

[0012] Further, the side frame is fixed with bearing transparent cover and bearing end cover on both sides, the bearing transparent cover is six, the hexagonal head bolt passes through the bearing transparent cover hole and is fixed on the upper two and four shaft holes on the left side and the right side of the side frame through the lock nut two, the bearing end cover is two, the hexagonal head bolt passes through the bearing end cover hole and is fixed on the two shaft holes below the left side of the side frame through the lock nut two, the shaft one passes through the bearing transparent cover at both ends, the shaft two passes through the bearing transparent cover at one end and is installed in the bearing end cover at the other end, the bearing transparent cover and the bearing end cover are internally provided with self-lubricating bearings, the inner diameter of the self-lubricating bearing is assembled with the outer diameter of the shaft shoulder at both ends of the shaft one and the shaft two.

[0013] Further, the inner side of the side frame is welded with a threaded plate, the threaded plate is provided with a threaded hole, the lower side of the side frame is welded with a limiting support base on both sides, a pull rod support base is welded at the center position below, and a hoisting plate is also welded at the center line above.

[0014] Further, the shaft one, the shaft two, and the middle and both sides of the blade are provided with straight pin holes, the straight pin passes through the straight pin holes on the blade and the shaft and is fixed on the shaft one and the shaft two through the lock nut one and the threads at the end of the straight pin, the blade rotates synchronously with the shaft one and the shaft two, the upper and lower ends of the blade are increased with bending, and the middle is provided with a circular arc.

[0015] Further, the right end of the shaft one and the shaft two is provided with a rotary arm, and the rotary arm is fixed on the shaft one and the shaft two through the internal hexagonal cylindrical end set screw and the flat key; the rotary arms on the shaft one and the shaft two are connected through a connecting rod, the end of the rotary arm and the both ends of the connecting rod are provided with pin holes, and the connecting rod is fixed on the rotary arm through the pin and the pin hole.

[0016] Further, the left end of the shaft one is provided with a pointer, and the pointer is fixed on the left end of the shaft one through the pointer bolt and the threaded hole at the center of the left end of the shaft one, the pointer rotates with the shaft one and points to the blade opening indicator;

[0017] The blade opening indicator is welded below the pointer tip below the shaft hole below, and the blade opening indicator is provided with a 0-90° scale indication.

[0018] Further, the limiting support is arranged on the limiting support base, and the limiting support is fixed on the limiting support base through the base bolt one and the limiting support base threaded hole;

[0019] The pull rod support is arranged on the pull rod support base, and the pull rod support is fixed on the pull rod support base through the base bolt two and the pull rod support base threaded hole;

[0020] The hoisting plate is provided with a hoisting hole, which is convenient for hoisting the valve.

[0021] Further, the pull rod support is provided with a pull rod bolt and is fixed by a pull rod nut, the pull rod bolt is provided with a pull rod bolt spring hole, the connecting rod is also provided with a connecting rod spring hole, one end of the spring is fixedly connected with the pull rod bolt spring hole, and the other end is fixedly connected with the connecting rod spring hole.

[0022] Further, a limiting support is arranged directly below the rotary arm, and the limiting support is fixed on a limiting support base by a base bolt one, a limiting bolt is arranged on the limiting support and is fixed on the limiting support by a bolt hole of the limiting support and a limiting nut; a bolt head of the limiting bolt is located directly below the rotary arm and is located on a rotary track of the rotary arm with the shaft two as the center.

[0023] The beneficial effects of the present application are:

[0024] 1. In the normal ventilation state, the explosion-proof valve is in the open state, and the airflow can pass through the ventilation opening from any direction to realize bidirectional ventilation. The explosion-proof valve can protect the personnel and facilities inside the building during the positive pressure stage and the negative pressure stage of the shock wave. After the explosion shock wave disappears, the explosion-proof valve can automatically return to the initial state and continue to provide normal ventilation function without manual reset, and has the functions of bidirectional explosion resistance and bidirectional ventilation.

[0025] 2. The explosion-proof valve integrates various protection functions of the outdoor air inlet, which can prevent rainwater from entering the building to corrode equipment or air pipes, and can prevent the shock wave from entering the building to damage personnel and equipment, and has the function of preventing the impact of tornado flying objects.

[0026] 3. The explosion-proof valve has a large effective ventilation area and strong ventilation capacity.

[0027] 4. The opening angle of the blade of the explosion-proof valve can be adjusted appropriately to meet the needs of different working conditions.

[0028] 5. After the explosion shock wave, the pressure difference decreases, and the blade can automatically reset under the action of the spring to restore normal ventilation. The whole process does not require electricity, saves energy, and is suitable for environments without electricity. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0030] Figure 1 It is a left view of the explosion-proof valve body frame of the present application.

[0031] Figure 2 This is a right view of the valve body frame of the explosion-proof wave valve of this utility model.

[0032] Figure 3 This is the front view of the explosion-proof wave valve of this utility model.

[0033] Figure 4 This is a BB view of the explosion-proof wave valve of this utility model.

[0034] Figure 5 This is a left view of the explosion-proof wave valve of this utility model.

[0035] Figure 6 This is a P-direction view of the explosion-proof wave valve of this utility model.

[0036] Figure 7 This is a view AA of the explosion-proof wave valve of this utility model (blade open state).

[0037] Figure 8 This is a view AA of the explosion-proof wave valve of this utility model (blade closed state).

[0038] In the diagram, 1. Valve body frame, 2. Blade, 3. Upper and lower frames, 4. Straight pin, 5. Locking nut one, 6. Valve body reinforcing rib, 7. Bearing cover, 8. Pointer bolt, 9. Pointer, 10. Blade opening indicator, 11. Bearing end cover, 12. Upper and lower valve seats, 13. Shaft one, 14. Shaft two, 15. Connecting rod, 16. Spring, 17. Limit bracket, 18. Base bolt one, 19. Tie rod bracket, 20. Base bolt two, 21. Limit bolt, 22. Limit nut, 23. Tie rod bolt, 24. Tie rod nut, 25. Side frame, 26. Threaded plate, 27. Hex head screw 28. Locking nut 2, 29. Self-lubricating bearing, 30. Limiting bracket base, 31. Tie rod bracket base, 32. Pin, 33. Rotary arm, 34. Flat key, 35. Socket headstock set screw, 36. Lifting plate, 37. Through hole, 38. Bearing cover hole, 39. Bearing end cover hole, 40. Tie rod bracket base threaded hole, 41. Limiting bracket base threaded hole, 42. Drain hole, 43. Connecting rod spring hole, 44. Tie rod bolt spring hole, 45. Pin hole, 46. Straight pin hole. Detailed Implementation

[0039] 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.

[0040] As shown in FIGS. 1-8, the embodiment provides a bi-directional ventilation protected vane-type blast-proof wave valve, comprising a valve body frame 1,

[0041] The valve body frame 1 comprises a combined welded upper and lower frame 3 and a side frame 25, and the upper and lower valve seats 12 are welded on the inner side of the upper and lower frame 3 of the valve body frame 1.

[0042] The side frame 25 is provided with four shaft passing holes 37 on both sides in a 2x2 manner, the shaft passing holes 37 are concentric on both sides in the horizontal direction and on the same straight line in the vertical direction, two shafts 13 and 14 are provided, the shafts 13 pass through the upper two groups of shaft passing holes 37 horizontally, and the shafts 14 pass through the lower two groups of shaft passing holes 37 horizontally.

[0043] The two shaft passing holes 37 on the left lower side of the side frame 25 are provided with bearing end cover holes 39 in the direction of a horizontal included angle of 30°, the two shaft passing holes 37 on the left upper side of the side frame 25 and the four shaft passing holes 37 on the right side of the side frame 25 are provided with bearing cover holes 38 in the direction of a horizontal included angle of 30°; a certain horizontal included angle can avoid mutual interference between the vane 2 and the bolt head of the hexagonal head bolt 27 of the fixed bearing cover 7 and the bearing end cover 11 when the vane 2 is opened or closed; the bearing end cover holes 39 and the bearing cover holes 38 are also concentric on both sides in the horizontal direction and on the same straight line in the vertical direction.

[0044] The bearing cover 7 has six pieces, the hexagonal head bolt 27 passes through the bearing cover hole 38 and is fixed on the two shaft passing holes 37 on the left upper side and the four shaft passing holes 37 on the right side of the side frame 25 through the locking nut two 28; the bearing end cover 11 has two pieces, the hexagonal head bolt 27 passes through the bearing end cover hole 39 and is fixed on the two shaft passing holes 37 on the left lower side of the side frame 25 through the locking nut two 28. The shaft 13 passes through the bearing cover 7 at both ends, and the shaft 14 passes through the bearing cover 7 at one end and is installed in the bearing end cover 11 at the other end.

[0045] The bearing cover 7 and the bearing end cover 11 are provided with self-lubricating bearings 29 inside, and the inner diameter of the self-lubricating bearings 29 is assembled with the outer diameter of the shaft shoulder of the shaft 13 and the shaft 14 at both ends. The self-lubricating bearings 29 have self-lubricating performance, do not need to add lubricating oil, can provide lubrication by themselves during use, reduce friction and wear, and ensure the rapid rotation of the shaft 13 and the shaft 14.

[0046] Through the above design, the shaft 13 and the shaft 14 can be concentric on both sides, and the valve can be ensured not to be blocked during operation.

[0047] The inner side of the side frame 25 is welded with a threaded plate 26 provided with threaded holes, facilitating the installation of the valve on site using fasteners. The lower sides of the side frame 25 are welded with limit support bases 30, and the center of the lower side is welded with a pull rod support base 31. The upper center line is also welded with a lifting plate 36.

[0048] The limit support bases 30 are provided with limit supports 17, which are fixed on the limit support bases 30 through base bolts 18 and limit support base threaded holes 41.

[0049] The pull rod support bases 31 are provided with pull rod supports 19, which are fixed on the pull rod support bases 31 through base bolts 20 and pull rod support base threaded holes 40.

[0050] The lifting plate 36 is provided with lifting holes, facilitating the lifting of the valve.

[0051] The middle and both sides of the shafts 13 and 14 and the vanes 2 are provided with straight pin holes 46. The straight pins 4 pass through the straight pin holes 46 of the vanes 2 and the shafts, and are fixed on the shafts 13 and 14 through lock nuts 5 and the threads at the ends of the straight pins 4, so that the vanes 2 are fixed on the shafts 13 and 14 and rotate synchronously with the shafts 13 and 14. The arc surface parts of the shafts 13 and 14 in contact with the vanes 2 and the lock nuts 5 are processed into planes, ensuring the stability of the assembly of the vanes 2 and the lock nuts 5.

[0052] The right ends of the shafts 13 and 14 are provided with rotary arms 33, which are fixed on the shafts 13 and 14 through internal hexagonal cylindrical end set screws 35 and flat keys 34. The rotary arms 33 on the shafts 13 and 14 are connected through connecting rods 15. The ends of the rotary arms 33 and the ends of the connecting rods 15 are provided with pin holes 45, and the connecting rods 15 are fixed on the rotary arms 33 through pins 32 and the pin holes 45. There are two connecting rods 15, one installed indoors and the other outdoors. When an explosion occurs indoors or outdoors, the shock wave acts on the vanes 2, the vanes 2 drive the shafts 13 and 14 to rotate along the shafts, the shafts 13 and 14 drive the rotary arms 33 to rotate, and the rotary arms 33 drive the connecting rods 15 to act. The above design makes the vanes 2, shafts 13 and 14, rotary arms 33, and connecting rods 15 form an integrated linkage mechanism, so as to realize the synchronous opening and closing of the vanes 2.

[0053] The left end of the shaft 13 is provided with a pointer 9, which is fixed on the left end of the shaft 13 through a pointer bolt 8 and a threaded hole at the center of the left end of the shaft 13. The pointer 9 rotates with the shaft 13 and points to a vane opening indicator 10.

[0054] The vane opening indicator 10 is welded at the position below the pointer 9 needle tip below the upper shaft hole 37, and the vane opening indicator 10 is provided with 0-90° scale indication.

[0055] The pull rod bolt 23 is fixed on the pull rod support 19 through the pull rod nut 24, the pull rod bolt 23 is provided with a pull rod bolt spring hole 44, the connecting rod 15 is also provided with a connecting rod spring hole 43, one end of the spring 16 is fixedly connected with the pull rod bolt spring hole 44, and the other end is fixedly connected with the connecting rod spring hole 43.

[0056] After the pull rod nut 24 is loosened, the relative position of the pull rod bolt 23 relative to the pull rod support 19 is artificially adjusted, the spring 16 is driven to move through the pull rod bolt 23, the connecting rod 15 is driven to move through the pulling force of the spring 16, the rotating arm 33 is driven to move together through the connecting rod 15, the shaft one 13 and the shaft two 14 are rotated through the rotating arm 33, and the vane 2 is rotated through the shaft one 13 and the shaft two 14, so that the opening and closing of the vane 2 are realized. According to the angle of the pointer 9 pointing to the vane opening indicator 10, the vane 2 is adjusted to a specified angle, the pull rod bolt 23 is fixed on the pull rod support 19 through the tightening of the pull rod nut 24, so that the purpose of adjusting the opening angle of the vane 2 is realized.

[0057] The limiting support 17 is arranged below the rotating arm 33, and is fixed on the limiting support base 30 through the base bolt one 18, the limiting support 17 is provided with a limiting bolt 21, and the limiting bolt 21 is fixed on the limiting support 17 through the bolt hole of the limiting support 17 and the limiting nut 22. The bolt head of the limiting bolt 21 is located below the rotating arm 33 and on the rotating track of the rotating arm 33 with the shaft two 14 as the center, the position of the limiting bolt 21 relative to the limiting support 17 is adjusted, and then the distance between the bolt head of the limiting bolt 21 and the rotating arm 33 is adjusted, through the adjustment of the distance, the rotating angle of the rotating arm 33 with the shaft two 14 as the center is blocked and limited, because the vane 2, the shaft one 13, the shaft two 14, the rotating arm 33 and the connecting rod 15 are an integral linkage mechanism, so the rotating angle of the rotating arm 33 with the shaft two 14 as the center is limited through the above adjustment, and the maximum opening angle of the vane 2 is limited, and then after the vane 2 is adjusted to the maximum opening angle required by the actual working condition according to the angle of the pointer 9 pointing to the vane opening indicator 10, the limiting nut 22 is tightened to fix the limiting bolt 21 on the limiting support 17, so that the purpose of limiting the maximum opening angle of the vane 2 is realized.

[0058] The upper and lower ends of the blade 2 are increased with bending, and the middle is provided with a circular arc. The bending of the two ends of the blade 2 is beneficial to the airflow and rainwater when the blade 2 is opened, and the upper and lower blade bending parts are overlapped and coincided when the blade 2 is closed, which is beneficial to sealing. The circular arc design in the middle of the blade 2 can change the stress distribution and reduce the local high stress points, thereby improving the overall carrying capacity and anti-deformation capacity of the blade. The valve body reinforcing ribs 6 are welded and fixed on the upper and lower frames 3, which can increase the strength of the valve body and provide support for the blade 2 when it is closed. At the same time, combined with the strength of the blade 2, the impact wave pressure and the impact of the flying objects in the tornado can be resisted together.

[0059] In the normal ventilation state, the blade 2 is in the opened state, and the adjacent blades 2 form a ventilation channel and constitute a rainproof louver, which plays a rainproof role. The indoor direction of the valve body frame 1 is bent towards the inside of the valve body to prevent rainwater from entering the indoor side. The outdoor side ventilation opening is provided with a drainage hole 42, which can further achieve the effects of rainproof and drainage.

[0060] The indoor and outdoor of the explosion-proof valve are respectively provided with two groups of blades 2, and the adjacent blades 2 form a ventilation channel. When the blades 2 are simultaneously in the opened state, the bidirectional ventilation purpose can be achieved. When an explosion occurs indoors or outdoors, the impact wave acts on the blade 2, and the blade 2 drives the shaft one 13 and the shaft two 14 to rotate. The shaft one 13 and the shaft two 14 drive the rotary arm 33 to rotate, and the connecting rod 15 moves together with the rotary arm 33. When the impact wave acting force acts on the blade 2, the blade 2 overcomes the tension of the spring 16 through the above linkage mechanism, and the blade 2 rotates along the center of the shaft one 13 and the shaft two 14 to completely close. The bending part of the blade 2 is overlapped and coincided, and the blade 2 is closely combined with the upper and lower valve seats 12, so as to form a closed ventilation channel and block the impact wave outside the building, thereby realizing bidirectional explosion resistance.

[0061] The connecting rod 15 and the pull rod bolt 23 are both provided with the spring 16. Therefore, whether an explosion occurs indoors or outdoors, when the impact wave disappears, the pressure difference decreases, and the blade 2 can automatically recover to the normal ventilation state through the above linkage mechanism under the reset tension of the spring 16, thereby realizing bidirectional reset function and automatically completing the whole process without power.

[0062] As described above, the bidirectional ventilation protection blade type explosion-proof valve effectively overcomes the defects of the prior art, integrates the protection functions of the outdoor air inlet, and has the functions of bidirectional explosion resistance, bidirectional reset, and bidirectional ventilation.

[0063] Each embodiment in the specification is described in a related manner, and the same and similar parts between each embodiment can be referred to each other. Each embodiment mainly explains the difference from other embodiments.

[0064] The above merely describes preferred embodiments of the present application, and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A two-way ventilation and protection blade-type explosion-proof wave valve, characterized in that, The valve body frame (1) includes a valve body frame (1) which comprises upper and lower frames (3) and side frames (25) welded together. Upper and lower valve seats (12) are welded to the inner side of the upper and lower frames (3) of the valve body frame (1). The upper and lower frames (3) are also welded and fixed with valve body reinforcing ribs (6); The side frame (25) has four through holes (37) on each side, which are distributed in a 2×2 manner. The through holes (37) are concentric on both sides in the horizontal direction and on the same straight line in the vertical direction. Two shafts (13) and two shafts (14) are provided. The shaft (13) passes horizontally through the two sets of through holes (37) above, and the shaft (24) passes horizontally through the two sets of through holes (37) below. Bearing end cap holes (39) are provided at the two shaft holes (37) on the lower left side of the side frame (25), and bearing through cap holes (38) are provided at the two shaft holes (37) on the upper left side of the side frame (25) and the four shaft holes (37) on the right side of the side frame; the bearing end cap holes (39) and the bearing through cap holes (38) are also concentric on both sides in the horizontal direction and on the same straight line in the vertical direction.

2. The blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 1, characterized in that, The side frame (25) is fixed with bearing covers (7) and bearing end caps (11) on both sides. There are 6 bearing covers (7). Hexagonal head bolts (27) pass through the bearing cover holes (38) and are then fixed to the bearing covers (7) on the two upper left and four right shaft holes (37) of the side frame (25) by locking nuts (28). There are 2 bearing end caps (11). Hexagonal head bolts (27) pass through the bearing end cap holes (39) and are then fixed to the bearing covers (7) on the two upper left and four right shaft holes (37) of the side frame (25) by locking nuts (28). The bearing end cap (11) is fixed on the two shaft holes (37) on the lower left side of the side frame (25); the first shaft (13) passes through the bearing cover (7) at both ends, and the second shaft (14) passes through the bearing cover (7) at one end and is installed in the bearing end cap (11) at the other end; the bearing cover (7) and the bearing end cap (11) are provided with self-lubricating bearings (29), and the inner diameter of the self-lubricating bearing (29) is assembled with the outer diameter of the shoulders at both ends of the first shaft (13) and the second shaft (14).

3. The blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 1, characterized in that, A threaded plate (26) is welded to the inner side of the side frame (25). The threaded plate (26) is provided with threaded holes. A limit bracket base (30) is welded to both sides below the side frame (25). A tie rod bracket base (31) is welded to the center position below. A lifting plate (36) is also welded to the center line above.

4. The blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 1, characterized in that, The shaft (13), shaft (14), and blade (2) are provided with pin holes (46) in the middle and on both sides. After the pin (4) passes through the pin hole (46) on the blade (2) and the shaft, the four blades (2) are fixed on the shaft (13) and shaft (14) respectively by the locking nut (5) and the thread at the end of the pin (4). The blade (2) has bends at both ends and an arc in the middle.

5. The blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 1, characterized in that, A rotating arm (33) is provided at the right end of both shaft one (13) and shaft two (14), and the rotating arm (33) is fixed on shaft one (13) and shaft two (14) by a hexagonal set screw (35) and a key (34); the rotating arm (33) on shaft one (13) and shaft two (14) is connected by a connecting rod (15), and the end of the rotating arm (33) and both ends of the connecting rod (15) are provided with pin holes (45), and the connecting rod (15) is fixed on the rotating arm (33) by a pin (32) and pin holes (45).

6. The blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 1, characterized in that, A pointer (9) is provided at the left end of the shaft of the first shaft (13), and the pointer (9) is fixed at the left end of the shaft of the first shaft (13) by the pointer bolt (8) and the threaded hole at the center of the left shaft head of the first shaft (13). The pointer (9) points to the blade opening indicator (10). The blade opening indicator (10) is located below the pointer (9) tip below the shaft hole (37) above, and the blade opening indicator (10) has a scale indication of 0 to 90°.

7. The blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 3, characterized in that, The limiting bracket base (30) is provided with a limiting bracket (17), and the limiting bracket (17) is fixed on the limiting bracket base (30) by the base bolt (18) and the threaded hole (41) of the limiting bracket base; A tie rod bracket (19) is provided on the tie rod bracket base (31), and the tie rod bracket (19) is fixed on the tie rod bracket base (31) by the base bolt two (20) and the tie rod bracket base thread hole (40); The lifting plate (36) is provided with lifting holes.

8. The blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 7, characterized in that, The tie rod bracket (19) is provided with tie rod bolts (23) and fixed by tie rod nuts (24). The tie rod bolts (23) are provided with tie rod bolt spring holes (44). The connecting rod (15) is also provided with connecting rod spring holes (43). One end of the spring (16) is connected and fixed to the tie rod bolt spring hole (44), and the other end is connected and fixed to the connecting rod spring hole (43).

9. A blade-type explosion-proof wave valve with bidirectional ventilation protection according to claim 5, characterized in that, A limit bracket (17) is provided directly below the rotating arm (33), and the limit bracket (17) is fixed on the limit bracket base (30) by the base bolt one (18). A limit bolt (21) is provided on the limit bracket (17), and the limit bolt (21) is fixed on the limit bracket (17) by the bolt hole of the limit bracket (17) and the limit nut (22). The bolt head of the limit bolt (21) is located directly below the rotating arm (33) and is on the rotation trajectory of the rotating arm (33) with the axis two (14) as the center.

Images