A mechanical seal device with a sealing ring linkage adapted to wide axial displacement

Abstract

The present application relates to a mechanical seal device with a seal ring linkage adapted to a wide axial displacement, including a dynamic ring assembly and a static ring assembly. The dynamic ring assembly includes a shaft sleeve sleeved and fixedly connected to a rotating shaft and a sealing dynamic ring sleeved and fixedly connected to the shaft sleeve. The static ring assembly includes a cavity, a sealing static ring, and a sliding assembly. The cavity is circumferentially and fixedly arranged on the inner wall of the housing. The sealing dynamic ring is located inside the annular cavity. The sealing static rings are abutted against both sides of the sealing dynamic ring. When the axial movement of the rotating shaft drives the axial movement of the sealing dynamic ring, the sealing dynamic ring drives the sealing static rings on both sides to slide along the anti-rotation rod on the inner wall of the cavity in the axial direction of the rotating shaft through the sliding assembly. A sealing assembly is arranged between the cavity and the static ring assembly and on both sides of the cavity for sealing the gap between the cavity and the static ring assembly. The present application has the advantage of meeting the sealing applicability of the sealing structure under the premise of a large axial displacement of the rotating shaft.

Description

Technical Field

[0001] The present application relates to the field of mechanical seals, and in particular to a mechanical seal device with a seal ring linkage for adapting to a wide axial displacement. Background Art

[0002] A mechanical seal is a shaft seal device for a rotating machine, such as equipment like centrifugal pumps, centrifuges, reactors, and compressors. Since the drive shaft penetrates inside and outside the equipment, there is a circumferential gap between the shaft and the equipment. The medium in the equipment leaks out through this gap. If the pressure inside the equipment is lower than the atmospheric pressure, air leaks into the equipment. Therefore, a shaft seal device to prevent leakage is necessary. In the current mechanical seal structure, a dynamic ring assembly is usually sleeved and fixedly connected on the rotating shaft, and a static ring assembly that abuts against the dynamic ring assembly is arranged inside the housing of the mechanical equipment. When the rotating shaft drives the dynamic ring assembly to rotate, the dynamic ring assembly can rotate on the static ring assembly, thereby achieving the seal between the shaft and the housing. However, when the rotating shaft undergoes a large axial displacement, it will cause the sealing end faces of the dynamic ring assembly and the static ring assembly to be crushed due to extrusion or the end faces cannot be normally closed, resulting in seal leakage, reducing the sealing applicability of the seal structure under the premise of the axial displacement of the rotating shaft. Summary of the Invention

[0003] In order to meet the sealing applicability of the seal structure under the premise of a large axial displacement of the rotating shaft of the equipment, the present application provides a mechanical seal device with a seal ring linkage for adapting to a wide axial displacement.

[0004] A mechanical seal device with a seal ring linkage for adapting to a wide axial displacement provided by the present application adopts the following technical solutions:

[0005] A mechanical seal device with a seal ring linkage for adapting to a wide axial displacement includes a dynamic ring assembly and a static ring assembly. The dynamic ring assembly includes a shaft sleeve sleeved and fixedly connected on the rotating shaft and a sealing dynamic ring sleeved and fixedly connected on the shaft sleeve. The static ring assembly includes a cavity, a sealing static ring, and a sliding assembly. The cavity is circumferentially and fixedly arranged on the inner wall of the housing. The sealing dynamic ring is located inside the annular cavity. The sealing dynamic ring abuts against the sealing static rings on both sides. When the rotating shaft axially moves in any direction to the left or right, driving the sealing dynamic ring to axially displace, the sealing dynamic ring drives the sealing static rings on both sides to slide along the axial direction of the rotating shaft on the inner wall of the cavity through the sliding assembly. A sealing assembly is arranged between the cavity and the static ring assembly and on both sides of the cavity for sealing the gap between the cavity and the static ring assembly.

[0006] By adopting the above technical solution, when the rotating shaft rotates, the rotating shaft can drive the sleeve to rotate, so that the sleeve drives the sealing dynamic ring to rotate on the two-side sealing static rings, thereby enabling the sealing dynamic ring and the sealing static rings to seal the leakage inside the housing. When the rotating shaft moves axially, the rotating shaft can drive the sealing dynamic ring on the sleeve to move axially. At this time, the two-side sealing static rings can follow the sealing dynamic ring to move synchronously along the circumferential direction of the rotating shaft through the sliding assembly, so that when the rotating shaft moves axially, the sealing dynamic ring and the sealing static rings still play a sealing role, preventing excessive contact force between the sealing dynamic ring and the sealing static rings from causing pressure damage to the sealing dynamic ring and the sealing static rings, and meeting the sealing applicability of the sealing device under the premise of large axial displacement of the rotating shaft. Arranging the sealing static rings on both sides of the sealing dynamic ring mainly plays an isolating role. When the inner side seal leaks, it is also the isolation liquid that leaks into the cavity, thereby preventing the medium processed by the equipment from mixing with the isolation liquid and preventing the medium processed by the equipment from leaking into the atmosphere.

[0007] Optionally, the sliding assembly includes a convex ring and a plurality of anti-rotation rods. The convex ring is circumferentially and fixedly arranged on the inner wall of the cavity. The plurality of anti-rotation rods are axially penetrated through the convex ring and fixedly connected to the convex ring. The anti-rotation rods are parallel to the axis of the rotating shaft. Static ring seats are circumferentially arranged on both sides of the sealing static rings, and both sides of the static ring seats are slidably arranged on the plurality of anti-rotation rods along the axial direction of the rotating shaft.

[0008] By adopting the above technical solution, when the sealing dynamic ring drives the two-side sealing static rings to move, the static ring seats driven by the two-side sealing static rings can move on the anti-rotation rods. The anti-rotation rods can guide the movement of the sealing static rings and prevent the sealing static rings from rotating synchronously with the sealing dynamic ring, improving the movement effect of the sealing static rings along the axial direction of the rotating shaft.

[0009] Optionally, the sliding assembly further includes a connecting rod arranged on the convex ring and located between every two adjacent anti-rotation rods. The connecting rod is penetrated through and slidably connected to the convex ring. The connecting rod is arranged parallel to the anti-rotation rod. Both sides of the static ring seats are sleeved and slidably connected to the plurality of connecting rods.

[0010] By adopting the above technical solution, when the sealing dynamic ring drives the two-side sealing static rings to move, the two-side sealing static rings can drive the plurality of connecting rods to move synchronously on the convex ring, so that the convex ring guides the movement of the connecting rods. The cooperation of the anti-rotation rods and the connecting rods improves the movement effect of the sealing dynamic ring driving the two-side sealing static rings in the cavity.

[0011] Optionally, the sliding assembly further includes an abutting member for driving the sealing static ring on the static ring seat to have a tendency to move towards the sealing dynamic ring to drive the sealing static ring and the sealing dynamic ring to abut.

[0012] By adopting the above technical solution, the provision of the abutting member enables both sealing static rings on both sides to move synchronously with the sealing dynamic ring when the sealing dynamic ring moves circumferentially along the rotating shaft, and improves the abutting effect between the sealing static rings on both sides and the sealing dynamic ring, thereby improving the sealing effect between the sealing dynamic ring and the sealing static rings on both sides.

[0013] Optionally, the abutting member includes a spring seat and a plurality of springs. Both ends of the plurality of connecting rods are circumferentially and fixedly provided with the spring seats. An opening for the anti-rotation rod to extend out when sliding on the convex ring is provided on the spring seat at the position where the anti-rotation rod is located. The plurality of springs are arranged circumferentially on the spring seat between the spring seat and the static ring seat. The springs are used to drive the sealing static ring on the static ring seat to have a tendency to move towards the sealing dynamic ring.

[0014] By adopting the above technical solution, the static ring seat can drive the sealing static ring to abut against the sealing dynamic ring by the elastic force of the spring, so that the sealing static rings on both sides can move synchronously with the sealing dynamic ring. When the sealing dynamic ring drives the sealing static rings on both sides to move axially along the rotating shaft, the sealing static rings on both sides can drive the static ring seat to move, so that the static ring seat drives the connecting rod to move on the convex ring by the spring. When the sealing dynamic ring does not move axially along the rotating shaft, the spring is not stretched or compressed, extending the service life of the spring. At this time, the sealing static rings on both sides drive the static ring seat to move on the anti-rotation rod, so that the static ring seat drives the spring seat to move. The anti-rotation rod can pass through the opening on the spring seat, preventing the anti-rotation rod from restricting the axial movement of the static ring seat and increasing the moving range of the sealing dynamic ring driving the sealing static rings on both sides.

[0015] Optionally, the sealing assembly includes an outer pressure cover and an inner pressure cover. The outer pressure cover is circumferentially arranged on one side of the cavity, and the inner pressure cover is circumferentially arranged on the other side of the cavity. One static ring seat is slidably arranged axially along the rotating shaft on the outer pressure cover, and the other static ring seat is slidably arranged axially along the rotating shaft on the inner pressure cover. A sliding seal is provided on the static ring seat for sealing the gaps between the static ring seat and the outer pressure cover and between the static ring seat and the inner pressure cover.

[0016] By adopting the above technical solution, when the sealing dynamic ring drives the sealing static rings on both sides to move circumferentially, the static ring seats on both sides can slide on the outer pressure cover and the inner pressure cover. At this time, the sliding seal can seal the gaps between the static ring seat and the outer pressure cover and the inner pressure cover during the sliding process, preventing the internal material from leaking along the gap between the inner pressure cover and the static ring seat and preventing external impurities from entering along the gap between the outer pressure cover and the static ring seat, thereby further improving the sealing effect between the outer pressure cover and the inner pressure cover.

[0017] Optionally, the sliding seal includes a sliding sealing strip circumferentially embedded on the inner wall of the static ring seat. The sliding sealing strip is used to abut against the outer pressure cover and the inner pressure cover.

[0018] By adopting the above technical solution, when the stationary ring seat slides on the inner gland and the outer gland, the sliding sealing strip can move on the inner gland and the outer gland, so that the sliding sealing strip seals the gap between the stationary ring seat, the inner gland and the outer gland. The structure of the sliding sealing strip is simple, and the sealing effect between the stationary ring seat, the inner gland and the outer gland is improved.

[0019] Optionally, a fixed seal is provided on the inner gland for sealing the gap between the inner gland and the shaft sleeve.

[0020] By adopting the above technical solution, the fixed seal can re-seal the gap between the inner gland and the shaft sleeve, preventing the processed material inside the housing from flowing along the gap between the inner gland and the shaft sleeve to the position where the dynamic seal ring and the static seal ring are located, and further improving the sealing effect of the entire sealing device.

[0021] Optionally, an abutting ring for abutting against one side of the dynamic seal ring is circumferentially provided on the shaft sleeve, and a limiting member for limiting the position of the dynamic seal ring is provided on the shaft sleeve on the other side of the abutting ring.

[0022] By adopting the above technical solution, the abutting member and the limiting member are provided to facilitate the fixing of the dynamic seal ring, thereby facilitating the installation and disassembly of the dynamic seal ring by the operator.

[0023] Optionally, the limiting member includes a positioning sleeve fixedly provided on the shaft sleeve circumferentially. The positioning sleeve is located on the side of the dynamic seal ring away from the abutting ring, and a sealing portion for sealing the gap between the positioning sleeve, the dynamic seal ring and the shaft sleeve is provided between the positioning sleeve and the dynamic seal ring.

[0024] By adopting the above technical solution, the sealing portion is provided to facilitate sealing the gap between the positioning sleeve, the dynamic seal ring and the shaft sleeve, thereby preventing the processed material inside the housing from leaking along the gap between the shaft sleeve and the dynamic seal ring, and further improving the sealing effect of the entire sealing device.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. When the rotating shaft rotates, the rotating shaft can drive the sleeve to rotate, so that the sleeve drives the dynamic sealing ring to rotate on the two static sealing rings, thus enabling the dynamic sealing ring and the static sealing ring to seal the leakage inside the housing. When the rotating shaft moves axially, the rotating shaft can drive the dynamic sealing ring on the sleeve to move axially. At this time, the two static sealing rings can follow the dynamic sealing ring to move synchronously along the circumferential direction of the rotating shaft through the sliding components, so that when the rotating shaft moves axially, the dynamic sealing ring and the static sealing ring still play a sealing role, preventing excessive contact force between the dynamic sealing ring and the static sealing ring from causing pressure damage to the dynamic sealing ring and the static sealing ring, and improving the sealing applicability of the sealing device under the premise of axial displacement of the rotating shaft;

[0027] 2. When the dynamic sealing ring drives the two static sealing rings to move, the static ring seats that the two static sealing rings can drive move on the anti-rotation rod. The anti-rotation rod can guide the movement of the static sealing ring and prevent the static sealing ring from rotating synchronously with the dynamic sealing ring, improving the movement effect of the static sealing ring along the axial direction of the rotating shaft;

[0028] 3. When the dynamic sealing ring drives the two static sealing rings to move, the two static sealing rings can drive a plurality of connecting rods to move synchronously on the convex ring, so that the convex ring guides the movement of the connecting rods. The cooperation of the anti-rotation rod and the connecting rods improves the movement effect of the dynamic sealing ring driving the two static sealing rings in the cavity. Brief Description of the Drawings

[0029] Figure 1 is the schematic cross-sectional structure diagram of an embodiment of the present application;

[0030] Figure 2 is the schematic semi-cross-sectional structure diagram of an embodiment of the present application for showing the anti-rotation rod;

[0031] Figure 3 is the schematic semi-cross-sectional structure diagram of an embodiment of the present application for showing the connecting rod;

[0032] Figure 4 is Figure 1 The part A in

[0033] Figure 5 is Figure 2 The enlarged view of part B in

[0034] Description of reference numerals: 1. Rotating shaft; 11. Bush; 111. Dynamic sealing ring; 112. Metal ring; 12. Abutting ring; 121. Positioning sleeve; 122. Retaining ring; 123. Annular groove; 13. Cavity; 131. Static sealing ring; 132. Convex ring; 133. Anti-rotation rod; 134. Fixed ring; 14. Static ring seat; 141. Groove; 142. Sealing ring; 143. Sliding seat; 15. Connecting rod; 151. Spring seat; 152. Spring; 153. Opening; 16. Inner gland; 161. First connecting ring; 162. Second connecting ring; 163. Outer gland; 164. Third connecting ring; 165. Fourth connecting ring; 166. Sliding sealing strip; 167. Accommodating groove; 17. First installation groove; 171. Cover; 172. Second installation groove; 173. Fixed sealing ring; 18. Positioning groove; 181. Positioning plate; 19. Inlet for isolating liquid; 191. Outlet for isolating liquid; 192. Inlet for flushing liquid. Detailed implementation manners

[0035] The following will further elaborate on this application in conjunction with the Figures 1-5 accompanying drawings.

[0036] An embodiment of this application discloses a mechanical seal device with a sealing ring linkage for adapting to wide axial displacement of equipment. Referring to Figure 1 , a mechanical seal device with a sealing ring linkage for adapting to wide axial displacement includes a dynamic ring assembly and a static ring assembly; in this embodiment, the left side in the figure is defined as the medium side and the right side in the figure is defined as the atmosphere side along the direction in the figure. During actual use, it can be adjusted adaptively according to different usage conditions.

[0037] Combining Figure 1 and Figure 2 , the dynamic ring assembly includes a bush 11 sleeved and fixedly connected to a rotating shaft 1 and a dynamic sealing ring 111 sleeved and fixedly connected to the bush 11. In order to improve the strength of the dynamic sealing ring 111, a metal ring 112 is sleeved and fixedly connected to the outer wall of the dynamic sealing ring 111; in order to detachably connect the dynamic sealing ring 111 to the bush 11, the dynamic sealing ring 111 is fixedly arranged on the bush 11 through a plurality of pins. An abutting ring 12 for abutting one side of the dynamic sealing ring 111 is circumferentially arranged on the bush 11. The abutting ring 12 is located on the side of the dynamic sealing ring 111 away from the medium side. The abutting ring 12 is integrally arranged with the bush 11. In order to improve the supporting strength of the abutting ring 12 for the dynamic sealing ring 111, the side of the abutting ring 12 away from the dynamic sealing ring 111 is inclined. A limiting member for limiting the position of the dynamic sealing ring 111 is arranged on the bush 11 and on the other side of the abutting ring 12.

[0038] Combining Figure 1 and Figure 2, the limiting member includes a positioning sleeve 121 that is circumferentially and fixedly arranged on the shaft sleeve 11. In this embodiment, the positioning sleeve 121 is fixedly arranged on the shaft sleeve 11 by screws. The positioning sleeve 121 is located on the side of the sealing dynamic ring 111 close to the medium, and the positioning sleeve 121 is located on the side of the sealing dynamic ring 111 away from the abutting ring 12. A sealing portion is provided between the positioning sleeve 121 and the sealing dynamic ring 111 for sealing the gap between the positioning sleeve 121, the sealing dynamic ring 111 and the shaft sleeve 11.

[0039] Combined with Figure 1 and Figure 2 , in this embodiment, the sealing portion includes a retaining ring 122 and an O-ring. An annular groove 123 is formed on the side of the sealing dynamic ring 111 facing the positioning sleeve 121. The surface of the annular groove 123 close to the shaft sleeve 11 penetrates through the sealing dynamic ring 111. The O-ring is located in the annular groove 123. One side of the O-ring abuts against the inner wall of the annular groove 123, and the other side abuts against the outer wall of the shaft sleeve 11. The retaining ring 122 is circumferentially and fixedly arranged on the positioning sleeve 121, and a part of the retaining ring 122 is located in the annular groove 123. When the sealing dynamic ring 111 expands and contracts axially due to heat, it will drive the O-ring to abut against the retaining ring 122, so as to adapt to the thermal expansion and contraction of the sealing dynamic ring 111.

[0040] Combined with Figure 1 and Figure 2 , the static ring assembly includes a cavity 13, a sealing static ring 131 and a sliding assembly. The cavity 13 is circumferentially and fixedly arranged on the inner wall of the housing. The sealing dynamic ring 111 is located inside the annular cavity 13. Sealing static rings 131 are abutted on both sides of the sealing dynamic ring 111. When the rotating shaft 1 moves axially to drive the sealing dynamic ring 111 to move axially, the sealing dynamic ring 111 drives the two-side sealing static rings 131 to slide along the axial direction of the rotating shaft 1 on the inner wall of the cavity 13 through the sliding assembly.

[0041] Combined with Figure 2 and Figure 3 , the sliding assembly includes a convex ring 132 and a plurality of anti-rotation rods 133. The convex ring 132 is circumferentially and fixedly arranged on the inner wall of the cavity 13 and is integrally formed with the cavity 13. The plurality of anti-rotation rods 133 are axially penetrated through the convex ring 132 and fixedly connected to the convex ring 132. In this embodiment, fixing rings 134 are sleeved and fixedly connected on both sides of the convex ring 132 on the anti-rotation rods 133, so that the anti-rotation rods 133 are restricted and fixed on the convex ring 132 by fixing the fixing rings 134 on the anti-rotation rods 133.

[0042] Combined with Figure 2 and Figure 3, the anti-rotation rod 133 is parallel to the axis of the rotating shaft 1. On both sides of the static sealing ring 131, a static ring seat 14 is circumferentially arranged. On the opposite surfaces of the two static ring seats 14, a groove 141 is formed. The surface of the groove 141 close to the shaft sleeve 11 penetrates through the static ring seat 14. The two static sealing rings 131 are correspondingly arranged in the two grooves 141 on both sides to position the static sealing ring 131. On the inner wall of the two grooves 141, a sealing ring 142 for abutting against the static sealing ring 131 is circumferentially clamped and arranged.

[0043] Combined with Figure 2 and Figure 3 , both static ring seats 14 are slidably arranged on the plurality of anti-rotation rods 133 along the axial direction of the rotating shaft 1. In this embodiment, on the surfaces of both static ring seats 14 facing away from the shaft sleeve 11, a sliding seat 143 is circumferentially arranged. The sliding seat 143 is integrally formed with the static ring seat 14. A through hole for the anti-rotation rod 133 to pass through is formed on the sliding seat 143. The static ring seat 14 is slidably arranged on the anti-rotation rod 133 through the sliding seat 143.

[0044] Combined with Figure 2 and Figure 3 , the sliding assembly further includes a connecting rod 15 arranged on the convex ring 132 and located between every two adjacent anti-rotation rods 133. The connecting rod 15 passes through and is slidably connected to the convex ring 132. The connecting rod 15 is arranged parallel to the anti-rotation rod 133. The two static ring seats 14 are sleeved and slidably connected to the plurality of connecting rods 15.

[0045] Combined with Figure 2 and Figure 3 , the sliding assembly further includes an abutting member for driving the static sealing ring 131 on the static ring seat 14 to have a tendency to move towards the dynamic sealing ring 111 to drive the static sealing ring 131 and the dynamic sealing ring 111 to abut; the abutting member includes a spring seat 151 and a plurality of springs 152. Spring seats 151 are circumferentially and fixedly arranged at both ends of the plurality of connecting rods 15.

[0046] Combined with Figure 2 and Figure 4In this embodiment, the spring seat 151 is fixedly arranged on the plurality of connecting rods 15 by bolts. The cross section of the spring seat 151 is arranged in a rectangular frame shape. The ends of the anti-rotation rod 133 and the connecting rod 15 are both located in the rectangular frame-shaped spring seat 151. The spring seat 151 is sleeved and slidably connected to the stationary ring seat 14. The spring seat 151 and the positions where the anti-rotation rod 133 and the connecting rod 15 are located are provided with openings 15 for the anti-rotation rod 133 to extend out when sliding on the convex ring 132. 3. A plurality of springs 152 are arranged between the spring seat 151 and the stationary ring seat 14 along the circumferential direction of the spring seat 151. The springs 152 are used to drive the sealing stationary ring 131 on the stationary ring seat 14 to have a tendency to move toward the sealing dynamic ring 111. The springs 152 are located in the rectangular frame-shaped spring seat 151. One end of the spring 152 abuts against the inner wall of the spring seat 151, and the other end abuts against the sliding seat 143 of the stationary ring seat 14. A through hole for the spring 152 to pass through is opened on the spring seat 151.

[0047] Combination Figure 2 and Figure 3 A sealing assembly for sealing the gap between the cavity 13 and the stationary ring assembly is arranged between the cavity 13 and the stationary ring assembly and on both sides of the cavity 13; the sealing assembly includes an outer pressure cover 163 and an inner pressure cover 16, the outer pressure cover 163 is circumferentially arranged on one side of the cavity 13 close to the atmosphere, and the inner pressure cover 16 is circumferentially arranged on the other side of the cavity 13 close to the medium, and the stationary ring seat 14 on one side is slidably arranged on the outer pressure cover 163 along the axial direction of the rotating shaft 1, and the stationary ring seat 14 on the other side is slidably arranged on the inner pressure cover 16 along the axial direction of the rotating shaft 1.

[0048] Combination Figure 2 and Figure 3 In the present embodiment, the cross section of the inner pressure cover 16 is set in an "L" shape. The "L"-shaped inner pressure cover 16 includes a first connecting ring 161 and a second connecting ring 162 integrally provided with the first connecting ring 161. The first connecting ring 161 is circumferentially and fixedly provided on the cavity 13, and the second connecting ring 162 is coaxially provided with the sleeve 11. One side of the second connecting ring 162 is fixedly provided on the first connecting ring 161, and the other side is extended toward a position close to the stationary ring seat 14. The stationary ring seat 14 close to the medium side abuts against the surface of the second connecting ring 162 facing away from the sleeve 11.

[0049] Combination Figure 2 and Figure 3, the outer gland 163 includes a third connecting ring 164 fixedly arranged on the cavity 13 by bolts and a fourth connecting ring 165 integrally arranged on the third connecting ring 164. The fourth connecting ring 165 is coaxially arranged with the shaft sleeve 11. One side of the fourth connecting ring 165 is arranged on the third connecting ring 164, and the other side extends towards the position close to the stationary ring seat 14. The stationary ring seat 14 on the side close to the atmosphere abuts against the surface of the fourth connecting ring 165 facing away from the shaft sleeve 11; on the opposite surfaces of the first connecting ring 161 of the inner gland 16 and the third connecting ring 164 of the outer gland 163, accommodation grooves 167 are provided for the two ends of the cavity 13 to move in. The surface of the accommodation groove 167 away from the shaft sleeve 11 penetrates through the first connecting ring 161 and the third connecting ring 164.

[0050] Combined Figure 2 and Figure 3 , in order to seal the gaps between the stationary ring seat 14, the outer gland 163 and the inner gland 16, a sliding seal is provided on the stationary ring seat 14 for sealing the gaps between the stationary ring seat 14 and the outer gland 163 and between the stationary ring seat 14 and the inner gland 16; the sliding seal includes a sliding sealing strip 166 circumferentially embedded on the inner wall of the stationary ring seat 14, and the sliding sealing strip 166 is used to abut against the outer gland 163 and the inner gland 16; the sliding sealing strip 166 is arranged as an O-ring.

[0051] Combined Figure 2 and Figure 5 , in order to close the gap between the inner gland 16 and the shaft sleeve 11, thereby preventing the processing material on the medium side from entering along the gap between the inner gland 16 and the shaft sleeve 11, a fixed seal is provided on the inner gland 16 for sealing the gap between the inner gland 16 and the shaft sleeve 11; in this embodiment, a first installation groove 17 is circumferentially provided on the side of the first connecting ring 161 close to the medium side. The surface of the first installation groove 17 close to the shaft sleeve 11 penetrates through the first connecting ring 161. A sealing cover 171 is circumferentially arranged in the first installation groove 17. The sealing cover 171 is fixedly arranged in the first installation groove 17 by bolts. Second installation grooves 172 are provided on the opposite surfaces of the sealing cover 171 and the first installation groove 17. The surface of the second installation groove 172 close to the shaft sleeve 11 penetrates through the side walls of the sealing cover 171 and the first installation groove 17. The fixed seal includes fixed sealing rings 173 circumferentially arranged in the two installation grooves, and the fixed sealing rings 173 are used to abut against the outer wall of the shaft sleeve 11, thereby realizing the sealing between the inner gland 16 and the shaft sleeve 11.

[0052] Such as Figure 3As shown, in this embodiment, in order to facilitate the positioning of the inner gland 16 during the installation of the inner gland 16, so as to realize the positioning of the inner gland 16, the cavity 13 and the outer gland 163, a positioning groove 18 is circumferentially formed on the shaft sleeve 11. A positioning plate 181 for inserting into the positioning groove 18 is detachably connected to the surface of the first connection ring 161 of the inner gland 16 facing away from the third connection ring 164 of the outer gland 163. The positioning plate 181 is detachably connected to the first connection ring 161 of the inner gland 16 by bolts. During installation, the positioning plate 181 is fixed to the first connection ring 161 of the inner gland 16 by bolts, driving the positioning plate 181 to be inserted into the positioning groove 18, so as to realize the positioning of the inner gland 16, facilitating the positioning of the subsequent cavity 13 and the outer gland 163. After the installation is completed, the positioning plate 181 needs to be removed.

[0053] Combined with Figure 2 and Figure 3 , an isolation liquid inlet 19 and an isolation liquid outlet 191 are formed on the cavity 13. The isolation liquid inlet 19 and the isolation liquid outlet 191 are oppositely formed on the cavity 13. The isolation liquid inlet 19 is arranged towards the position between the sliding seat 143 and the convex ring 132, and the isolation liquid outlet 191 is arranged towards the position between the sliding seat 143 and the spring seat 151. By inputting the isolation liquid along the isolation liquid inlet 19, the isolation liquid is filled into the space surrounded by the cavity 13, the inner gland 16, the outer gland 163, the static ring seat 14, the sealing static ring 131 and the sealing dynamic ring 111, so that the isolation liquid plays a role in re-sealing the leaked raw materials.

[0054] Combined with Figure 2 and Figure 3 , a flushing liquid inlet 192 is formed on the cavity 13. One end of the flushing liquid inlet 192 is located adjacent to the isolation liquid inlet 19, and the other end extends into the inner gland 16 and penetrates through the surface of the second connection ring 162 away from the first connection ring 161. When the processing material on the medium side flows along the gap between the fixed sealing ring 173 and the shaft sleeve 11 to the position where the sealing static ring 131 and the sealing dynamic ring 111 are located, by conveying the flushing liquid towards the flushing liquid inlet 192, the flushing liquid realizes the cleaning of the sealing dynamic ring 111 and the sealing static ring 131. The flushing liquid can improve the operating environment of the end faces of the dynamic ring 111 and the static ring 131, and extend the service life of the sealing dynamic ring 111 and the sealing static ring 131.

[0055] The implementation principle of a mechanical seal device with a seal ring linkage adapted to a wide axial displacement in an embodiment of the present application is as follows: When the rotating shaft 1 undergoes an axial movement, the rotating shaft 1 can drive the seal moving ring 111 to move axially, thereby causing the seal moving ring 111 to drive the two seal stationary rings 131 to move axially. The two seal stationary rings 131 drive the two stationary ring seats 14 to move axially. The stationary ring seat 14 drives the sliding seat 143 to move on the anti-rotation rod 133, causing the anti-rotation rod 133 to pass through the opening 153 on the spring seat 151. At the same time, the sliding seat 143 drives the spring seat 151 to move by relying on the spring 152, causing the spring seat 151 to drive the connecting rod 15 to move on the convex ring 132. The sliding seat 143, the spring 152, the spring seat 151, and the connecting rod 15 form a component that moves as a whole, thus ensuring the compression amount of the spring 152. The anti-rotation rod 133 bears the weight and floating, enabling the seal moving ring 111 and the seal stationary ring 131 to achieve a sealing effect while moving axially as a whole. At this time, the stationary ring seat 14 can move on the inner gland 16 and the outer gland 163, causing the sliding sealing strip 166 to seal the gaps between the two stationary ring seats 14, the inner gland 16, and the outer gland 163, preventing excessive contact force between the seal moving ring 111 and the seal stationary ring 131 from causing pressure damage to the seal moving ring 111 and the seal stationary ring 131 or the end face from not closing properly due to too small contact force, and meeting the sealing applicability of the seal device under the premise of a large axial displacement of the rotating shaft 1.

[0056] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A mechanical seal device with a seal ring linkage adapted to wide axial displacement, characterized in that: It includes a rotating ring assembly and a stationary ring assembly. The rotating ring assembly includes a shaft sleeve (11) sleeved and fixedly connected to a rotating shaft (1) and a sealing rotating ring (111) sleeved and fixedly connected to the shaft sleeve (11). The stationary ring assembly includes a cavity (13), a sealing stationary ring (131), and a sliding assembly. The cavity (13) is circumferentially and fixedly arranged on the inner wall of the housing. The sealing rotating ring (111) is located inside the annular cavity (13). The sealing stationary rings (131) are abutted against both sides of the sealing rotating ring (111). When the axial movement of the rotating shaft (1) drives the axial movement of the sealing rotating ring (111), the sealing rotating ring (111) drives the sealing stationary rings (131) on both sides to slide axially along the rotating shaft (1) through the sliding assembly. A sealing assembly is arranged between the cavity (13) and the stationary ring assembly and on both sides of the cavity (13) for sealing the gap between the cavity (13) and the stationary ring assembly. The sliding assembly includes a convex ring (132) and a plurality of anti-rotation rods (133). The convex ring (132) is circumferentially and fixedly arranged on the inner wall of the cavity (13). The plurality of anti-rotation rods (133) are axially penetrated through and fixedly connected to the convex ring (132). The anti-rotation rods (133) are parallel to the axis of the rotating shaft (1). Stationary ring seats (14) are circumferentially arranged on both sides of the sealing stationary rings (131). The stationary ring seats (14) on both sides are slidably arranged axially along the rotating shaft (1) on the plurality of anti-rotation rods (133). The sliding assembly further includes a connecting rod (15) arranged on the convex ring (132) and located between every two adjacent anti-rotation rods (133). The connecting rod (15) is penetrated through and slidably connected to the convex ring (132). The connecting rod (15) is arranged parallel to the anti-rotation rods (133). The stationary ring seats (14) on both sides are sleeved and slidably connected to the plurality of connecting rods (15). The sliding assembly further includes an abutting member for driving the sealing stationary ring (131) on the stationary ring seat (14) to have a tendency to move towards the sealing rotating ring (111) so as to drive the sealing stationary ring (131) and the sealing rotating ring (111) to abut.

2. The mechanical seal device with a seal ring linkage adapted to wide axial displacement according to claim 1, characterized in that: The abutting member includes a spring seat (151) and a plurality of springs (152). The spring seats (151) are circumferentially and fixedly arranged at both ends of the plurality of connecting rods (15). An opening (153) is formed on the spring seat (151) at the position where the anti-rotation rod (133) is located for the anti-rotation rod (133) to extend out when sliding on the convex ring (132). The plurality of springs (152) are circumferentially arranged between the spring seat (151) and the stationary ring seat (14) for driving the sealing stationary ring (131) on the stationary ring seat (14) to have a tendency to move towards the sealing rotating ring (111).

3. The mechanical seal device for a sealing ring linkage to adapt to wide axial displacement according to claim 1, characterized in that: The sealing assembly includes an outer pressure cover (163) and an inner pressure cover (16). The outer pressure cover (163) is circumferentially arranged on one side of the cavity (13), and the inner pressure cover (16) is circumferentially arranged on the other side of the cavity (13). One static ring seat (14) is slidably arranged on the outer pressure cover (163) along the axial direction of the rotating shaft (1), and the other static ring seat (14) is slidably arranged on the inner pressure cover (16) along the axial direction of the rotating shaft (1). A sliding seal is provided on the static ring seat (14) for sealing the gaps between the static ring seat (14) and the outer pressure cover (163) and between the static ring seat (14) and the inner pressure cover (16).

4. A mechanical seal device with a seal ring linkage adapted to wide axial displacement according to claim 3, characterized in that: The sliding seal includes a sliding seal strip (166) circumferentially embedded in the static ring seat (14), and the sliding seal strip (166) is used to abut against the outer pressure cover (163) and the inner pressure cover (16).

5. A mechanical seal device with a seal ring linkage adapted to wide axial displacement according to claim 3, characterized in that: A fixed seal is provided on the inner pressure cover (16) for sealing the gap between the inner pressure cover (16) and the shaft sleeve (11).

6. A mechanical seal device with a seal ring linkage adapted to wide axial displacement according to any one of claims 1-5, characterized in that: An abutting ring (12) for abutting against one side of the sealing dynamic ring (111) is circumferentially arranged on the shaft sleeve (11), and a limiting member for limiting the position of the sealing dynamic ring (111) is arranged on the shaft sleeve (11) and on the other side of the abutting ring (12).

7. A mechanical seal device with a seal ring linkage adapted to wide axial displacement according to claim 6, characterized in that: The limiting member includes a positioning sleeve (121) circumferentially and fixedly arranged on the shaft sleeve (11). The positioning sleeve (121) is located on the side of the sealing dynamic ring (111) away from the abutting ring (12), and a sealing portion for sealing the gaps between the positioning sleeve (121), the sealing dynamic ring (111) and the shaft sleeve (11) is provided between the positioning sleeve (121) and the sealing dynamic ring (111).

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