Synchronous bearing connecting rod type closed valve

Abstract

The utility model provides a synchronous bearing connecting rod type closed valve which comprises a plurality of blades and a connecting rod assembly, the connecting rod assembly is connected with the blades and can drive the blades to rotate, the connecting rod assembly comprises a first connecting rod, a second connecting rod, a connecting piece and a rolling bearing, one end of the connecting piece is fixedly connected with the first connecting rod, and a sliding long hole is formed in the middle of the connecting piece; the rolling bearing is installed in the sliding long hole, a bearing outer ring of the rolling bearing makes contact with the inner surface of the sliding long hole, the rolling bearing can slide in the extending direction of the sliding long hole, and the second connecting rod is fixedly connected with a bearing inner ring of the rolling bearing. The first connecting rod and the second connecting rod are connected through the structures of the connecting pieces and the rolling bearings, so that the whole connecting rod transmission structure is more stable, deviation in the connecting rod transmission process is avoided, synchronous movement of the blades is guaranteed, and stable performance of the whole structure in the long-term use process is guaranteed; and the closed valve can more stably and reliably control the flowing of an airflow medium in the operation process.

Description

Technical Field

[0001] The utility model relates to a synchronous bearing connecting rod type airtight valve. Background Art

[0002] In today's industrial and civil fields, as a key device for controlling the flow and blocking of gas media, the performance of the airtight valve directly affects the operation efficiency, safety and effective utilization of energy of the system.

[0003] The airtight valve completes the switching of the sealing and circulation of the ventilation holes through the rotation of multiple blades. To ensure the sealing performance of the airtight valve, multiple blades need to rotate synchronously to the sealing state to ensure complete contact between the blades. However, in the prior art, there are some significant defects in the connecting rod structure of the airtight valve. During operation, due to the serious deviation in the actual application of the connection between the connecting rod and the inclined rod, the connecting rod cannot move synchronously.

[0004] This asynchronous phenomenon will seriously affect the sealing performance, working efficiency and stability of the airtight valve, thus causing a series of potential safety hazards, such as medium leakage, pressure imbalance, etc., and also causing unnecessary waste of energy. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a synchronous bearing connecting rod type airtight valve to overcome the defect that the connecting rod structure of the airtight valve in the prior art is prone to deviation during operation, resulting in asynchronism of the blades.

[0006] The utility model solves the above technical problem through the following technical solutions:

[0007] The utility model provides a synchronous bearing connecting rod type airtight valve, which includes a plurality of blades and a connecting rod assembly. The connecting rod assembly is connected to the blades and can drive the blades to rotate. The connecting rod assembly includes a first connecting rod, a second connecting rod, a connecting piece and a rolling bearing. One end of the connecting piece is fixedly connected to the first connecting rod, and a sliding long hole is formed in the middle of the connecting piece; the rolling bearing is installed in the sliding long hole, the outer ring of the bearing of the rolling bearing is in contact with the inner surface of the sliding long hole, the rolling bearing can slide along the extending direction of the sliding long hole, and the second connecting rod is fixedly connected to the inner ring of the bearing of the rolling bearing.

[0008] In this technical solution, by setting the structure of the connecting piece and the rolling bearing, the first connecting rod and the second connecting rod are connected, making the whole connecting rod transmission structure more stable, avoiding deviation during the connecting rod transmission process, ensuring the synchronous movement of the blades, and improving the sealing performance and stability of the airtight valve.

[0009] Preferably, one end of the outer bearing ring away from the second connecting rod forms a convex edge extending radially outward, and the diameter of the convex edge is greater than the width of the sliding long hole.

[0010] In this technical solution, by setting the convex edge, the connecting piece sleeved on the outer bearing ring will not slide out of the outside of the outer bearing ring, ensuring that the rolling bearing always slides in the sliding long hole, and the rolling bearing and the connecting piece will not be separated, thus ensuring the stability of the entire operation process of the connecting rod assembly and providing a solid guarantee for the reliable operation of the closed valve.

[0011] Preferably, the connecting rod assembly further includes a locking member, the locking member passes through the rolling bearing and the second connecting rod, and the locking member fixes the inner bearing ring and the second connecting rod.

[0012] In this technical solution, the inner bearing ring and the second connecting rod are fixed by the locking member, so that the second connecting rod and the inner bearing ring can rotate together around the axis of the rolling bearing.

[0013] Preferably, the connecting rod assembly further includes a gasket, the gasket is clamped between the inner bearing ring and the second connecting rod, and the gasket does not contact the outer bearing ring.

[0014] In this technical solution, the gasket is clamped between the inner bearing ring and the second connecting rod, realizing the synchronous rotation of the second connecting rod and the inner bearing ring; and the gasket does not contact the outer bearing ring, ensuring that the relative rotation of the outer bearing ring and the inner bearing ring is not affected by the gasket.

[0015] Preferably, the second connecting rod has a mounting hole, and the mounting hole is correspondingly arranged with the inner bearing ring; the locking member includes a locking rod and a locking ring, the locking rod sequentially passes through the inner bearing ring and the mounting hole, the outer peripheral surface of the locking rod is in interference fit with the inner peripheral surface of the inner bearing ring, one end of the locking rod away from the second connecting rod forms a head extending radially outward, the locking ring is sleeved on the locking rod, and the locking ring and the head of the locking rod press the inner bearing ring and the second connecting rod.

[0016] In this technical solution, the locking rod sequentially passes through the inner bearing ring and the mounting hole, threading the rolling bearing and the second connecting rod together, and then pressing the inner bearing ring and the second connecting rod by the locking ring sleeved on the locking rod, so that the inner bearing ring and the second connecting rod can rotate together, and thus the second connecting rod can rotate around the axis of the rolling bearing.

[0017] Preferably, the connecting rod assembly further includes a gasket, the gasket is sleeved on the locking rod, the gasket is clamped between the inner bearing ring and the second connecting rod, the inner peripheral surface of the gasket is matched with the outer peripheral surface of the locking rod, and the outer diameter of the gasket is the same as the outer diameter of the inner bearing ring.

[0018] In this technical solution, the shape of the gasket corresponds to the shape of the inner ring of the bearing, enabling the gasket to be in full contact with the end face of the inner ring of the bearing, ensuring the frictional force between the gasket and the inner ring of the bearing. At the same time, the outer ring of the bearing does not contact the gasket, and the outer ring and the inner ring of the bearing can rotate relatively freely.

[0019] Preferably, the locking rod is a locking bolt, the locking ring is a locking nut, and the locking bolt and the locking nut are in threaded engagement.

[0020] In this technical solution, the locking method of the bolt and the nut can quickly realize the installation of the second connecting rod, facilitating installation and disassembly.

[0021] Preferably, the locking nut is a thrust nut.

[0022] In this technical solution, the locking nut is preferably a thrust nut, so that the locking nut will not move backward after being locked, and will not become loose during the operation of the connecting rod, ensuring the pressing force between the inner ring of the bearing and the second connecting rod.

[0023] Preferably, the extending direction of the sliding long hole is perpendicular to the extending direction of the first connecting rod; when the distance between the second connecting rod and the first connecting rod is the smallest, the rolling bearing is located at one end of the sliding long hole close to the first connecting rod.

[0024] In this technical solution, the sliding long hole serves to limit and guide the relative displacement of the first connecting rod and the second connecting rod; designing the extending direction of the sliding long hole to be perpendicular to the extending direction of the first connecting rod facilitates the design and calculation of the transmission relationship of the connecting rod assembly.

[0025] Preferably, the closed valve further includes a mounting frame, the blade is located within the mounting frame, and the link assembly is mounted on the side of the mounting frame; several blades are respectively the first driven blade, the active blade, the second driven blade, and the third driven blade from top to bottom; the link assembly further includes an active rod, an active inclined rod, a first driven rod, a first inclined rod, a second driven rod, a second inclined rod, a third driven rod, a third inclined rod, and a third link. The active rod passes through the mounting frame and is coaxially fixed to the rotating shaft of the active blade. One end of the active rod located outside the mounting frame is fixedly connected to the active inclined rod. The first driven rod passes through the mounting frame and is coaxially fixed to the rotating shaft of the first driven blade. One end of the first driven rod located outside the mounting frame is fixedly connected to the first inclined rod. The second driven rod passes through the mounting frame and is coaxially fixed to the rotating shaft of the second driven blade. One end of the second driven rod located outside the mounting frame is fixedly connected to the second inclined rod. The third driven rod passes through the mounting frame and is coaxially fixed to the rotating shaft of the third driven blade. One end of the third driven rod located outside the mounting frame is fixedly connected to the third inclined rod. Two ends of the first link are respectively hinged to the first inclined rod and the second inclined rod. Two ends of the second link are respectively hinged to the active inclined rod and the third inclined rod. Two ends of the third link are respectively hinged to the first inclined rod and the active inclined rod. The hinge axes of the first link and the first inclined rod are coaxially arranged with the hinge axes of the third link and the first inclined rod. The hinge axes of the third link and the active inclined rod are coaxially arranged with the hinge axes of the second link and the active inclined rod. The first link and the second link are respectively located on both sides of the active rod, and the connecting piece is located below the active rod.

[0026] In this technical solution, through the above structural design, when the active rod rotates, it can drive the first driven blade, the active blade, the second driven blade, and the third driven blade to rotate synchronously, realizing the switching between the two states of the closed valve, namely, sealing and opening.

[0027] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present utility model.

[0028] The positive and progressive effects of the present utility model are as follows:

[0029] The above-mentioned synchronous bearing connecting rod type airtight valve connects the first connecting rod and the second connecting rod by setting up the structure of the connecting piece and the rolling bearing, making the whole connecting rod transmission structure more stable, avoiding deviation during the connecting rod transmission process, ensuring the synchronous movement of the blades, being able to withstand the tests of harsh working conditions such as frequent vibration, impact and temperature change, ensuring the stable performance of the whole structure during long-term use, reducing the need for maintenance and repair, enabling the airtight valve to control the flow of the air flow medium more stably and reliably during operation, effectively avoiding problems such as leakage, and greatly improving the operation efficiency and safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. is a schematic structural diagram of the synchronous bearing connecting rod type airtight valve of the present utility model.

[0031] Figure 2 is Figure 1 a schematic structural diagram of another angle of the synchronous bearing connecting rod type airtight valve shown in FIG.

[0032] Figure 3 is Figure 2 a partially enlarged schematic diagram of the synchronous bearing connecting rod type airtight valve shown in FIG.

[0033] Figure 4 is Figure 3 a sectional schematic diagram of the synchronous bearing connecting rod type airtight valve shown in FIG.

[0034] DESCRIPTION OF THE REFERENCE NUMERALS

[0035] Mounting frame 1

[0036] Blade 2

[0037] First driven blade 21

[0038] Active blade 22

[0039] Second driven blade 23

[0040] Third driven blade 24

[0041] Connecting rod assembly 3

[0042] First connecting rod 31

[0043] Second connecting rod 32

[0044] Mounting hole 321

[0045] Connecting piece 33

[0046] Sliding long hole 331

[0047] Rolling bearing 34

[0048] Bearing outer ring 341

[0049] Inner ring 342 of bearing

[0050] Flange 343

[0051] Locking member 35

[0052] Locking rod 351

[0053] Locking ring 352

[0054] Head 353

[0055] Gasket 36

[0056] Driving rod 37

[0057] Driving inclined rod 38

[0058] First driven rod 39

[0059] First inclined rod 310

[0060] Second driven rod 320

[0061] Second inclined rod 330

[0062] Third driven rod 340

[0063] Third inclined rod 350

[0064] Third connecting rod 360 Specific embodiments

[0065] The present utility model will be further described below by way of embodiments, but the present utility model is not limited to the scope of the described embodiments.

[0066] Figures 1 to 2 Shown is an embodiment of the synchronous bearing link type airtight valve of the present utility model. The airtight valve includes an installation frame 1, a plurality of blades 2 and a link assembly 3. The blades 2 are located inside the installation frame 1, and the link assembly 3 is installed on the side of the installation frame 1. The link assembly 3 is connected to the blades 2 and can drive the blades 2 to rotate. The link assembly 3 drives the blades 2 to rotate synchronously to the vertical state to seal the airtight valve; the link assembly 3 drives the blades 2 to rotate synchronously to the horizontal state to allow air to flow on both sides of the airtight valve.

[0067] As Figures 1 to 4As shown, the connecting rod assembly 3 includes a first connecting rod 31, a second connecting rod 32, a connecting piece 33 and a rolling bearing 34. One end of the connecting piece 33 is fixedly connected to the first connecting rod 31, and a sliding long hole 331 is formed in the middle of the connecting piece 33; the rolling bearing 34 is installed in the sliding long hole 331, and the outer ring 341 of the bearing of the rolling bearing 34 is in contact with the inner surface of the sliding long hole 331. The rolling bearing 34 can slide along the extending direction of the sliding long hole 331, and the second connecting rod 32 is fixedly connected to the inner ring 342 of the bearing of the rolling bearing 34.

[0068] For the connecting rod assembly 3, in addition to realizing the transmission between the connecting rods through the mutually hinged connecting rods, the first connecting rod 31 and the second connecting rod 32 are also connected by the connecting piece 33 and the rolling bearing 34. When relative displacement occurs between the first connecting rod 31 and the second connecting rod 32, while the rolling bearing 34 moves in the sliding long hole 331 of the connecting piece 33, the second connecting rod 32 can rotate around the axis of the rolling bearing 34. By setting the structure of the connecting piece 33 and the rolling bearing 34 to connect the first connecting rod 31 and the second connecting rod 32, the entire connecting rod transmission structure is made more stable, avoiding deviation during the connecting rod transmission process, ensuring the synchronous movement of the blades, and improving the sealing performance and stability of the closed valve.

[0069] Among them, the first connecting rod 31 and the second connecting rod 32 are the core supporting parts of the entire connecting rod assembly 3, and they are integrally in a slender strip shape. The first connecting rod 31 and the second connecting rod 32 are carefully made of high-strength metal materials, such as high-quality stainless steel or high-performance alloy steel, and the cross-sectional shape thereof can be flexibly selected according to the actual application scenario and the stress situation. The widths of the first connecting rod 31 and the second connecting rod 32 are precisely calculated and optimized to minimize the weight while meeting the strength requirements and improving the flexibility of movement. The surfaces of the first connecting rod 31 and the second connecting rod 32 are finely ground and polished, so that their surface roughness is extremely low, which not only reduces the frictional resistance during movement, but also greatly enhances their wear resistance and corrosion resistance, and extends the service life.

[0070] Moreover, the lengths of the connecting piece 33 and the sliding long hole 331 are customized according to the specific specifications and installation space of the closed valve; through precise measurement and calculation, it is ensured that the connecting rod can accurately transmit power and achieve synchronous movement inside the closed valve, cooperate with other components, and realize the efficient and stable operation of the closed valve. The surface of the connecting piece 33 adopts an advanced galvanizing process to further improve its surface hardness and corrosion resistance, greatly enhancing its overall strength and anti-deformation ability, so that it can withstand long-term and high-frequency working loads without fatigue damage.

[0071] Such as Figure 3 、 Figure 4As shown in the figure, at one end of the outer bearing ring 341 away from the second connecting rod 32, a convex edge 343 extending radially outward is formed, and the diameter of the convex edge 343 is greater than the width of the sliding elongated hole 331. By providing the convex edge 343, the connecting piece 33 sleeved on the outer bearing ring 341 will not slide out of the outer bearing ring 341, ensuring that the rolling bearing 34 always slides within the sliding elongated hole 331, and preventing the rolling bearing 34 and the connecting piece 33 from becoming disengaged. This ensures the stability of the entire operation process of the connecting rod assembly 3, providing a solid guarantee for the reliable operation of the closed valve.

[0072] As Figure 4 shown in the figure, the connecting rod assembly 3 further includes a locking member 35. The locking member 35 passes through the rolling bearing 34 and the second connecting rod 32, and the locking member 35 fixes the inner bearing ring 342 and the second connecting rod 32 together. By fixing the inner bearing ring 342 and the second connecting rod 32 with the locking member 35, the second connecting rod 32 and the inner bearing ring 342 can rotate together around the axis of the rolling bearing 34.

[0073] Among them, the connecting rod assembly 3 further includes a gasket 36. The gasket 36 is sandwiched between the inner bearing ring 342 and the second connecting rod 32, and the gasket 36 does not contact the outer bearing ring 341. The gasket 36 is sandwiched between the inner bearing ring 342 and the second connecting rod 32, and the surface of the gasket 36 is in close contact with the end face of the inner bearing ring 342 and the surface of the second connecting rod 32, thus realizing the synchronous rotation of the second connecting rod 32 and the inner bearing ring 342. And the non-contact between the gasket 36 and the outer bearing ring 341 ensures that the relative rotation between the outer bearing ring 341 and the inner bearing ring 342 is not affected by the gasket 36.

[0074] Specifically, the second connecting rod 32 has a mounting hole 321, and the mounting hole 321 is correspondingly arranged with the inner bearing ring 342; the locking member 35 includes a locking rod 351 and a locking ring 352. The locking rod 351 sequentially passes through the inner bearing ring 342 and the mounting hole 321. The outer peripheral surface of the locking rod 351 is in interference fit with the inner peripheral surface of the inner bearing ring 342. At one end of the locking rod 351 away from the second connecting rod 32, a head 353 extending radially outward is formed. The locking ring 352 is sleeved on the locking rod 351, and the locking ring 352 and the head 353 of the locking rod 351 press the inner bearing ring 342 and the second connecting rod 32 tightly.

[0075] The locking rod 351 sequentially passes through the inner bearing ring 342 and the mounting hole 321, threading the rolling bearing 34 and the second connecting rod 32 together. Then, the inner bearing ring 342 and the second connecting rod 32 are tightly pressed by the locking ring 352 sleeved on the locking rod 351, enabling the inner bearing ring 342 and the second connecting rod 32 to rotate together, so that the second connecting rod 32 can rotate around the axis of the rolling bearing 34.

[0076] Among them, the gasket 36 can be an annular gasket. The gasket 36 is sleeved on the locking rod 351. The gasket 36 is clamped between the inner ring 342 of the bearing and the second connecting rod 32. The inner peripheral surface of the gasket 36 is matched with the outer peripheral surface of the locking rod 351, and the outer diameter of the gasket 36 is the same as the outer diameter of the inner ring 342 of the bearing. The shape of the gasket 36 corresponds to the shape of the inner ring 342 of the bearing, so that the gasket 36 is in full contact with the end face of the inner ring 342 of the bearing, ensuring the frictional force between the gasket 36 and the inner ring 342 of the bearing; at the same time, the outer ring 341 of the bearing does not contact the gasket 36, and the outer ring 341 and the inner ring 342 of the bearing can rotate relatively freely.

[0077] The locking rod 351 is preferably a locking bolt, and the locking ring 352 is preferably a locking nut. The locking bolt and the locking nut are in threaded fit. The locking method of the bolt and the nut can quickly realize the installation of the second connecting rod 32, which is convenient for installation and disassembly. Among them, the locking nut is preferably a thrust nut, so that the locking nut will not retreat after being locked and will not loosen during the operation of the connecting rod, ensuring the pressing force between the inner ring 342 of the bearing and the second connecting rod 32.

[0078] As Figures 1 to 2 shown, the extending direction of the sliding long hole 331 is perpendicular to the extending direction of the first connecting rod 31; when the distance between the second connecting rod 32 and the first connecting rod 31 is the smallest, the rolling bearing 34 is located at one end of the sliding long hole 331 close to the first connecting rod 31. During the operation of the connecting rod assembly 3, when the second connecting rod 32 moves away from the first connecting rod 31, the rolling bearing 34 moves to the end of the sliding long hole 331 away from the first connecting rod 31, and at the same time, the second connecting rod 32 can rotate relative to the axis of the rolling bearing 34; when the second connecting rod 32 approaches the first connecting rod 31, the rolling bearing 34 moves to one end of the sliding long hole 331 close to the first connecting rod 31. The sliding long hole 331 serves to limit and guide the relative displacement of the first connecting rod 31 and the second connecting rod 32; designing the extending direction of the sliding long hole 331 to be perpendicular to the extending direction of the first connecting rod 31 facilitates the design and calculation of the transmission relationship of the connecting rod assembly 3.

[0079] As Figures 1 to 2As shown in the figure, several blades 2 of the closed valve are, from top to bottom, the first driven blade 21, the active blade 22, the second driven blade 23, and the third driven blade 24 respectively; the connecting rod assembly 3 of this embodiment further includes an active rod 37, an active inclined rod 38, a first driven rod 39, a first inclined rod 310, a second driven rod 320, a second inclined rod 330, a third driven rod 340, a third inclined rod 350, and a third connecting rod 360. The active rod 37 passes through the installation frame 1 and is coaxially fixed with the rotating shaft of the active blade 22. One end of the active rod 37 located outside the installation frame 1 is fixedly connected to the active inclined rod 38. The first driven rod 39 passes through the installation frame 1 and is coaxially fixed with the rotating shaft of the first driven blade 21. One end of the first driven rod 39 located outside the installation frame 1 is fixedly connected to the first inclined rod 310. The second driven rod 320 passes through the installation frame 1 and is coaxially fixed with the rotating shaft of the second driven blade 23. One end of the second driven rod 320 located outside the installation frame 1 is fixedly connected to the second inclined rod 330. The third driven rod 340 passes through the installation frame 1 and is coaxially fixed with the rotating shaft of the third driven blade 24. One end of the third driven rod 340 located outside the installation frame 1 is fixedly connected to the third inclined rod 350. Both ends of the first connecting rod 31 are respectively hinged to the first inclined rod 310 and the second inclined rod 330. Both ends of the second connecting rod 32 are respectively hinged to the active inclined rod 38 and the third inclined rod 350. Both ends of the third connecting rod 360 are respectively hinged to the first inclined rod 310 and the active inclined rod 38. The hinge axes of the first connecting rod 31 and the first inclined rod 310 are coaxially arranged with the hinge axes of the third connecting rod 360 and the first inclined rod 310. The hinge axes of the third connecting rod 360 and the active inclined rod 38 are coaxially arranged with the hinge axes of the second connecting rod 32 and the active inclined rod 38. The first connecting rod 31 and the second connecting rod 32 are respectively located on both sides of the active rod 37, and the connecting piece 33 is located below the active rod 37.

[0080] For the connecting rod assembly 3, through the above structural design, when the active rod 37 rotates, it can drive the first driven blade 21, the active blade 22, the second driven blade 23, and the third driven blade 24 to rotate synchronously, realizing the switching between the sealed state and the open state of the closed valve.

[0081] The connecting rod assembly 3 with the above structure ensures the synchronous movement of the connecting rods, can withstand the tests of harsh working conditions such as frequent vibrations, impacts, and temperature changes, always maintains a good connection state, without loosening or displacement; in the face of complex and changeable working environments and high-frequency working cycles, it can always maintain a firm connection, ensuring the stable performance of the entire structure during long-term use, reducing the need for maintenance and repair, enabling the closed valve to more stably and reliably control the flow of the gas medium during operation, effectively avoiding problems such as leakage, and greatly improving the operation efficiency and safety of the system.

[0082] The present utility model is not limited to the above embodiments. No matter what changes are made in its shape or structure, they all fall within the protection scope of the present utility model. The protection scope of the present utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present utility model, but these changes and modifications all fall within the protection scope of the present utility model.

Claims

1. A synchronous bearing connecting rod type airtight valve, comprising a plurality of blades and a connecting rod assembly, the connecting rod assembly is connected to the blades and can drive the blades to rotate, characterized in that, The connecting rod assembly includes: A first connecting rod and a second connecting rod; A connecting piece, one end of the connecting piece is fixedly connected to the first connecting rod, and a sliding long hole is formed in the middle of the connecting piece; A rolling bearing, the rolling bearing is installed in the sliding long hole, the outer ring of the bearing of the rolling bearing is in contact with the inner surface of the sliding long hole, the rolling bearing can slide along the extending direction of the sliding long hole, and the second connecting rod is fixedly connected to the inner ring of the bearing of the rolling bearing.

2. The synchronous bearing connecting rod type airtight valve according to claim 1, wherein: One end of the outer ring of the bearing away from the second connecting rod forms a convex edge extending radially outward, and the diameter of the convex edge is greater than the width of the sliding long hole.

3. The synchronous bearing connecting rod type airtight valve according to claim 1, characterized in that: The connecting rod assembly further includes a locking member, the locking member passes through the rolling bearing and the second connecting rod, and the locking member fixes the inner ring of the bearing and the second connecting rod.

4. The synchronous bearing connecting rod type airtight valve according to claim 3, characterized in that, The connecting rod assembly further includes a gasket, the gasket is sandwiched between the inner ring of the bearing and the second connecting rod, and the gasket is not in contact with the outer ring of the bearing.

5. The synchronous bearing connecting rod type airtight valve according to claim 3, characterized in that, The second connecting rod has a mounting hole, and the mounting hole is correspondingly arranged with the inner ring of the bearing; the locking member includes a locking rod and a locking ring, the locking rod sequentially passes through the inner ring of the bearing and the mounting hole, the outer peripheral surface of the locking rod is in interference fit with the inner peripheral surface of the inner ring of the bearing, one end of the locking rod away from the second connecting rod forms a head extending radially outward, the locking ring is sleeved on the locking rod, and the locking ring and the head of the locking rod press the inner ring of the bearing and the second connecting rod.

6. The synchronous bearing connecting rod type airtight valve according to claim 5, characterized in that, The connecting rod assembly further includes a gasket, the gasket is sleeved on the locking rod, the gasket is sandwiched between the inner ring of the bearing and the second connecting rod, the inner peripheral surface of the gasket is matched with the outer peripheral surface of the locking rod, and the outer diameter of the gasket is the same as the outer diameter of the inner ring of the bearing.

7. The synchronous bearing connecting rod type airtight valve according to claim 5, characterized in that The locking rod is a locking bolt, the locking ring is a locking nut, and the locking bolt and the locking nut are in threaded fit.

8. The synchronous bearing connecting rod type airtight valve as claimed in claim 7, wherein: The locking nut is a thrust nut.

9. The synchronous bearing connecting rod type airtight valve according to claim 1, characterized in that: The extending direction of the sliding long hole is perpendicular to the extending direction of the first connecting rod; when the distance between the second connecting rod and the first connecting rod is the smallest, the rolling bearing is located at one end of the sliding long hole close to the first connecting rod.

10. The synchronous bearing connecting rod type airtight valve according to any one of claims 1 to 9, characterized in that: The closed valve further includes a mounting frame, the blade is located within the mounting frame, and the link assembly is mounted on the side of the mounting frame; several blades are respectively the first driven blade, the active blade, the second driven blade, and the third driven blade from top to bottom; the link assembly further includes an active rod, an active inclined rod, a first driven rod, a first inclined rod, a second driven rod, a second inclined rod, a third driven rod, a third inclined rod, and a third link. The active rod penetrates through the mounting frame and is coaxially fixed to the rotation axis of the active blade. One end of the active rod located outside the mounting frame is fixedly connected to the active inclined rod. The first driven rod penetrates through the mounting frame and is coaxially fixed to the rotation axis of the first driven blade. One end of the first driven rod located outside the mounting frame is fixedly connected to the first inclined rod. The second driven rod penetrates through the mounting frame and is coaxially fixed to the rotation axis of the second driven blade. One end of the second driven rod located outside the mounting frame is fixedly connected to the second inclined rod. The third driven rod penetrates through the mounting frame and is coaxially fixed to the rotation axis of the third driven blade. One end of the third driven rod located outside the mounting frame is fixedly connected to the third inclined rod. Two ends of the first link are respectively hinged to the first inclined rod and the second inclined rod. Two ends of the second link are respectively hinged to the active inclined rod and the third inclined rod. Two ends of the third link are respectively hinged to the first inclined rod and the active inclined rod. The hinge axes of the first link and the first inclined rod and the hinge axes of the third link and the first inclined rod are coaxially arranged. The hinge axes of the third link and the active inclined rod and the hinge axes of the second link and the active inclined rod are coaxially arranged; the first link and the second link are respectively located on both sides of the active rod, and the connecting piece is located below the active rod.

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