Three-petal sealing nitrogen filling structure for centrifugal machine

Abstract

The invention relates to the technical field of sealing structures, and discloses a three-valve sealing nitrogen filling structure for a centrifugal machine, which comprises a shell, a shaft sleeve is arranged in the shell, a mounting groove is formed in the shell, and a sealing ring is arranged in the mounting groove. Residual scraps on the sealing ring are cleaned, and the sealing ring is cleaned after shutdown, so that the problems that the weight of the sealing ring is increased due to excessive scraps during use, and the sealing ring cannot be normally suspended outside the shaft sleeve due to the overweight sealing ring during subsequent nitrogen injection are avoided, and the service life of the sealing ring is prolonged. The normal use of the sealing ring is ensured, the shell is flapped by a flapping rod to vibrate the shell, the vibration is transmitted to the sealing ring to vibrate the sealing ring, chippings accumulated on the sealing ring are shaken off, the chippings move outwards along the inclined shell, and the sealing effect is improved. And in cooperation with the blown-out airflow, the cleaning effect on the chippings is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing structures, and in particular relates to a three-petal sealing nitrogen filling structure for a centrifuge. Background Art

[0002] The centrifuge uses the centrifugal force generated by high-speed rotation to separate components of different density or particle size in a mixture. During the use of the centrifuge, a sealing structure needs to be set at its main shaft to prevent the medium from leaking to the outside through the gap at the main shaft.

[0003] The existing sealing structure is that a shaft sleeve is arranged outside the main shaft, a shell is arranged outside the shaft sleeve, a three-petal sealing ring is arranged inside the shell, and a port for introducing nitrogen is opened on the shell. When in use, nitrogen is introduced into the port so that the nitrogen fills the shell and lifts up the three-petal sealing ring to keep it in a suspended state with the shaft sleeve, and an air film is formed between the shaft sleeve and the sealing ring with the help of the introduced nitrogen, which can prevent the medium from leaking out. However, even if there is a nitrogen air film support between the sealing ring and the shaft sleeve, there will be slight wear, resulting in the shaft sleeve wearing and producing debris. After shutdown, most of the debris falls under the inner wall of the sealing ring under the action of gravity, resulting in an increase in the weight of the sealing ring. In the long run, the weight of the sealing ring is too large. When nitrogen is introduced later, the nitrogen cannot lift up the sealing ring, resulting in an uneven gap between the sealing ring and the main shaft, resulting in an uneven air film formed, which affects the sealing effect.

[0004] Therefore, it is necessary to invent a centrifuge with a three-valve seal nitrogen filling structure to solve the above problems. Summary of the invention

[0005] In view of the above problems, the present invention provides a three-valve seal nitrogen filling structure for a centrifuge to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a three-petal seal nitrogen filling structure for a centrifuge, comprising a housing, a shaft sleeve is provided inside the housing, a mounting groove is provided inside the housing, a sealing ring is provided inside the mounting groove, a cleaning assembly for cleaning the sealing ring is provided outside the sealing ring, and a ring plate is provided at one end of the housing;

[0007] The cleaning assembly comprises: an electromagnet, an annular magnet, a cavity arranged on the sleeve, a plurality of inclined holes arranged outside the sleeve and connected to the cavity, a channel, a plunger, and a tilting assembly for tilting the housing;

[0008] The electromagnet is arc-shaped, an annular cavity is provided at the lower interior of the shell, the electromagnet is arranged in the annular cavity, the annular magnet is sleeved on the outside of the sealing ring, the channel is arranged on the sleeve, one end of the channel is connected to the cavity, and the other end is connected to the outside, and the plunger is arranged at one end of the channel.

[0009] Furthermore, the sealing ring can move in the installation groove along the axial direction perpendicular to the sleeve. The magnetic pole direction generated by the electromagnet when energized is the same as that of the annular magnet. The repulsive force between the electromagnet and the annular magnet is sufficient to overcome gravity and drive the sealing ring to rise and separate from the sleeve.

[0010] Furthermore, the tilting assembly includes: a bracket, a connecting plate, and a cylinder;

[0011] The bracket is fixedly connected to one side of the top of the shell, one end of the connecting plate is rotatably installed in the bracket, the cylinder is fixedly connected to the top of the ring plate, and one end of the cylinder rod of the cylinder is fixedly connected to the connecting plate.

[0012] Furthermore, a main shaft is provided inside the shaft sleeve, and the shaft sleeve is fixedly connected to the main shaft by a pair of screws. A vertical groove is provided at the lower outer side of the shell, and a beating component for beating the bottom of the shell is provided in the vertical groove.

[0013] Furthermore, the beating assembly includes: a slider slidably arranged in the vertical slot, a spring, a vertical plate, a driving assembly for driving the vertical plate to descend, and a beating rod;

[0014] The racket rod is arranged at the bottom of the shell and one end is fixedly connected to the vertical plate, the vertical plate is fixedly connected to the slider, and the spring fixes the bottom end of the slider to the bottom wall of the vertical slot.

[0015] Furthermore, the driving assembly includes: a push rod, an extrusion block, and a curved surface arranged on one side of the extrusion block;

[0016] The push rod is fixedly connected to the top of the vertical plate, and the extrusion blocks are multiple and equidistantly fixed around the outer side of the shaft sleeve.

[0017] Furthermore, a sealing gasket is provided between the ring plate and the shell.

[0018] Furthermore, threads are provided inside the channel near the plunger.

[0019] Technical effects and advantages of the present invention:

[0020] 1. The present invention realizes the cleaning of the residual debris on the sealing ring. By cleaning the sealing ring after shutdown, it is avoided that the weight of the sealing ring increases due to excessive debris during use. When nitrogen is subsequently injected, the sealing ring is too heavy to be normally suspended outside the shaft sleeve, resulting in an uneven nitrogen film formed between the sealing ring and the shaft sleeve, thereby affecting the sealing effect, thereby ensuring the normal use of the sealing ring;

[0021] 2. The present invention uses a beater to beat the shell to make it vibrate, and the vibration is transmitted to the sealing ring to make it vibrate, so as to shake off the debris accumulated on the sealing ring, so that the debris moves outward along the inclined shell, and cooperates with the blown air flow to further improve the cleaning effect of the debris. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a three-petal seal nitrogen filling structure for a centrifuge according to an embodiment of the present invention is shown;

[0023] Figure 2 A schematic cross-sectional view of a three-petal seal nitrogen filling structure for a centrifuge according to an embodiment of the present invention is shown;

[0024] Figure 3 The embodiment of the present invention is shown Figure 2 The enlarged structural diagram at A in the middle;

[0025] Figure 4 A schematic structural diagram of a sealing ring and an annular magnet assembly according to an embodiment of the present invention is shown;

[0026] In the figure: 1. shell; 2. sleeve; 3. mounting groove; 4. sealing ring; 5. ring plate; 6. electromagnet; 7. annular magnet; 8. cavity; 9. inclined hole; 10. channel; 11. plunger; 12. bracket; 13. connecting plate; 14. cylinder; 15. slider; 16. spring; 17. vertical plate; 18. push rod; 19. racket rod; 20. extrusion block; 21. arc surface; 22. sealing gasket; 23. main shaft; 24. screw. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0028] The present invention provides a three-valve sealing nitrogen filling structure for a centrifuge, such as Figures 1 to 4 As shown, it comprises a shell 1, a shaft sleeve 2 is arranged inside the shell 1, a mounting groove 3 is arranged inside the shell 1, a sealing ring 4 is arranged inside the mounting groove 3, the sealing ring 4 is a three-petal sealing structure, a cleaning assembly for cleaning the sealing ring 4 is arranged outside the sealing ring 4, a ring plate 5 is arranged at one end of the shell 1, and a through port for injecting nitrogen which is communicated with the inside of the shell 1 is arranged on the top of the shell 1;

[0029] The cleaning assembly includes: an electromagnet 6, an annular magnet 7, a cavity 8 arranged on the sleeve 2, a plurality of inclined holes 9 arranged outside the sleeve 2 and connected to the cavity 8, a channel 10, a plunger 11, and a tilting assembly for tilting the housing 1. The cavity 8 is arranged in an annular shape.

[0030] The electromagnet 6 is arc-shaped, and an annular cavity is provided at the lower part of the interior of the shell 1. The electromagnet 6 is arranged in the annular cavity. The annular magnet 7 is sleeved on the outside of the sealing ring 4. The channel 10 is arranged on the sleeve 2. One end of the channel 10 is connected to the cavity 8, and the other end is connected to the outside. The plunger 11 is arranged at one end of the channel 10.

[0031] When in use, one side of the ring plate 5 is fixed on the centrifuge, and nitrogen is injected into the space between the housing 1 and the shaft sleeve 2 through the opening. The introduction of nitrogen lifts the sealing ring 4 so that it is centrally located outside the shaft sleeve 2. The nitrogen forms a uniform air film between the sealing ring 4 and the shaft sleeve 2. The air film formed by the nitrogen prevents the gas in the centrifuge from leaking to the outside.

[0032] Even if there is a nitrogen film support between the sealing ring 4 and the sleeve 2, there will be slight wear, resulting in the sleeve 2 being worn and producing debris. After shutdown, most of the debris falls under the inner wall of the sealing ring 4 under the action of gravity, resulting in an increase in the weight of the sealing ring 4. In the long run, the sealing ring 4 is too heavy. When nitrogen is subsequently introduced, the nitrogen cannot lift the sealing ring 4, resulting in an uneven gap between the sealing ring 4 and the sleeve 2, causing an uneven air film to be formed, which affects the sealing effect. Therefore, when the machine is shut down, the electromagnet 6 is energized to make it magnetic, so that the repelling annular magnet 7 causes it to rise with the sealing ring 4, and finally the sealing ring 4 rises until its top wall is separated from the sleeve 2. At this time, the sealing ring 4 is in a state of being suspended outside the sleeve 2, and then the plunger 11 is removed, and the external gas injection equipment is connected to the channel 10. The connection between the gas device and the channel 10 is connected by a hose, and then gas is injected into the channel 10 through the gas injection device. The airflow enters the cavity 8 and is blown out through multiple inclined holes 9. At the same time, the shell 1 is tilted downward by the tilting component. As the airflow blows out, the debris remaining on the sealing ring 4 can be blown away. The blown away debris moves outward along the inclined shell 1 and finally leaves through one end of the shell 1, thereby achieving the cleaning of the residual debris on the sealing ring 4. By cleaning the sealing ring 4 after shutdown, it is avoided that the weight of the sealing ring 4 increases due to excessive debris during use. When nitrogen is subsequently injected, the sealing ring 4 is too heavy to be normally suspended outside the sleeve 2, resulting in an uneven air film formed by the nitrogen between the sealing ring 4 and the sleeve 2, which in turn affects the sealing effect and ensures the normal use of the sealing ring 4.

[0033] like Figure 2 As shown, the sealing ring 4 can move in the mounting groove 3 along the axial direction perpendicular to the shaft sleeve 2. When the electromagnet 6 is energized, the magnetic pole direction generated is the same as that of the annular magnet 7. The repulsive force between the electromagnet 6 and the annular magnet 7 is sufficient to overcome gravity and drive the sealing ring 4 to rise and separate from the shaft sleeve 2.

[0034] When the sealing ring 4 needs to be cleaned, the sealing ring 4 can be suspended outside the shaft sleeve 2, so that the debris between the sealing ring 4 and the shaft sleeve 2 will not be blocked, ensuring that the debris can leave the housing 1 more thoroughly.

[0035] like Figure 1 and Figure 2 As shown, the tilting assembly includes: a bracket 12, a connecting plate 13, and a cylinder 14;

[0036] The bracket 12 is fixedly connected to one side of the top of the shell 1 , one end of the connecting plate 13 is rotatably installed in the bracket 12 , the cylinder 14 is fixedly connected to the top of the ring plate 5 , and one end of the cylinder rod of the cylinder 14 is fixedly connected to the connecting plate 13 .

[0037] Starting the cylinder 14 causes its cylinder rod to extend, and the connecting plate 13, the bracket 12, and the shell 1 move accordingly, so that the shell 1 moves in the direction away from the ring plate 5. Under the action of gravity, the shell 1 will rotate downward with the bracket 12 as a fulcrum, so that the end of the shell 1 away from the ring plate 5 is tilted downward to achieve inclination. Starting the cylinder 14 causes its cylinder rod to shorten, so that the connecting plate 13, the bracket 12, and the shell 1 are pulled to reset, so that the shell 1 is in close contact with the ring plate 5 again.

[0038] like Figure 1 and Figure 2 As shown, a main shaft 23 is provided inside the sleeve 2, and the main shaft 23 is the main shaft on the centrifuge. The sleeve 2 is fixedly connected to the main shaft 23 by a pair of screws 24. A vertical groove is opened at the lower outer side of the shell 1, and a beating component for beating the bottom of the shell 1 is provided in the vertical groove.

[0039] When the shell 1 is tilted, the screw 24 is removed, and the sleeve 2 can now rotate relative to the main shaft 23. The sleeve 2 rotates forward so that it cooperates with the flapping assembly to flap the bottom of the shell 1 to make it vibrate. The vibration is transmitted to the sealing ring 4 to make it vibrate, and the debris accumulated on the sealing ring 4 is shaken off, so that the debris moves outward along the tilted shell 1, and the airflow is blown out to further improve the cleaning effect of the debris.

[0040] like Figure 1 and Figure 2 As shown, the beating assembly includes: a slider 15 slidably arranged in the vertical slot, a spring 16, a vertical plate 17, a driving assembly for driving the vertical plate 17 to descend, and a beating rod 19;

[0041] The lever 19 is arranged at the bottom of the shell 1 and one end is fixedly connected to the vertical plate 17, the vertical plate 17 is fixedly connected to the slider 15, and the spring 16 fixes the bottom end of the slider 15 to the bottom wall of the vertical groove. The lever 19 initially contacts the shell 1, and the spring 16 is in a deformed state.

[0042] The shaft sleeve 2 is rotated forward to cooperate with the driving assembly to drive the vertical plate 17 and the slider 15 to descend to compress the spring 16. The vertical plate 17 and the slap rod 19 are descended to separate the slap rod 19 from the housing 1 and cancel the interference state with the housing 1. Then the driving assembly cancels the driving of the vertical plate 17, and the compressed spring 16 releases the force to drive the slider 15, the vertical plate 17, and the slap rod 19 to rise rapidly. The slap rod 19 hits the housing 1 to make it vibrate.

[0043] During one cleaning process, the rotation angle of the sleeve 2 is 300 degrees to prevent the hose of the gas injection equipment from being excessively twisted and damaged.

[0044] like Figure 2 As shown, the driving assembly includes: a push rod 18, an extrusion block 20, and an arc surface 21 disposed on one side of the extrusion block 20;

[0045] The push rod 18 is fixedly connected to the top of the vertical plate 17 , and a plurality of extrusion blocks 20 are fixed around the outer side of the shaft sleeve 2 at equal intervals.

[0046] The positively rotating sleeve 2 causes the extrusion block 20 to move therewith, and the arc surface 21 of the extrusion block 20 contacts the top of the push rod 18, so that the push rod 18 causes the vertical plate 17 to descend. When the extrusion block 20 separates from the push rod 18, the drive to the vertical plate 17 is canceled.

[0047] like Figure 2 As shown, a sealing gasket 22 is provided between the ring plate 5 and the housing 1 .

[0048] This ensures good sealing between the ring plate 5 and the housing 1 .

[0049] like Figure 2 As shown, the interior of the channel 10 is provided with threads near the plunger 11 .

[0050] The provided threads make it easy to connect and disassemble with the gas injection equipment.

[0051] Working principle: When in use, one side of the ring plate 5 is fixed on the centrifuge, and nitrogen is injected into the space between the housing 1 and the shaft sleeve 2 through the opening. The introduction of nitrogen lifts the sealing ring 4 so that it is centered outside the shaft sleeve 2. The nitrogen forms a uniform air film between the sealing ring 4 and the shaft sleeve 2. The air film formed by the nitrogen prevents the gas in the centrifuge from leaking to the outside.

[0052] Even if there is a nitrogen film support between the sealing ring 4 and the shaft sleeve 2, there will be slight wear, resulting in the shaft sleeve 2 being worn and producing debris. After shutdown, most of the debris falls below the inner wall of the sealing ring 4 under the action of gravity, resulting in an increase in the weight of the sealing ring 4. In the long run, the weight of the sealing ring 4 is too large. When nitrogen is subsequently introduced, the nitrogen cannot lift the sealing ring 4, resulting in an uneven gap between the sealing ring 4 and the shaft sleeve 2, resulting in an uneven air film formed, which affects the sealing effect. Therefore, when the machine is shut down, the electromagnet 6 is energized to make it magnetic, so that the repelling annular magnet 7 causes it to rise with the sealing ring 4, and finally the sealing ring 4 rises until its top wall is separated from the shaft sleeve 2. At this time, the sealing The sealing ring 4 is in a state of being suspended outside the sleeve 2, and then the plunger 11 is removed, and the external gas injection equipment is connected to the channel 10. The connection between the gas injection equipment and the channel 10 is connected by a hose, and then gas is injected into the channel 10 through the gas injection equipment. The airflow enters the cavity 8 and is blown out through multiple inclined holes 9. The cylinder 14 is started to extend its cylinder rod and move with the connecting plate 13, the bracket 12, and the shell 1, so that the shell 1 moves away from the ring plate 5. Under the action of gravity, the shell 1 will rotate downward with the bracket 12 as the fulcrum, so that the end of the shell 1 away from the ring plate 5 is tilted downward to achieve inclination. As the airflow is blown out, the debris remaining on the sealing ring 4 can be blown away. The debris moves outward along the inclined shell 1 and finally leaves through one end of the shell 1, thereby cleaning the residual debris on the sealing ring 4. By cleaning the sealing ring 4 after shutdown, it is avoided that the weight of the sealing ring 4 increases due to excessive debris during use. When nitrogen is injected later, the sealing ring 4 is too heavy to be normally suspended outside the shaft sleeve 2, resulting in an uneven air film formed by the nitrogen between the sealing ring 4 and the shaft sleeve 2, thereby affecting the sealing effect, thereby ensuring the normal use of the sealing ring 4; when the shell 1 is tilted, the screw 24 is removed, and the shaft sleeve 2 can rotate relative to the main shaft 23 at this time. The shaft sleeve 2 rotates forward so that it moves with the extrusion block 20, and the extrusion The curved surface 21 of the block 20 contacts the top of the push rod 18, so that it contacts the push rod 18 and brings the vertical plate 17 down. The vertical plate 17 brings the slider 15 down to compress the spring 16. The vertical plate 17 brings the racket 19 down, so that the racket 19 is separated from the shell 1 and the contact state with the shell 1 is cancelled. When the extrusion block 20 is separated from the push rod 18, the compressed spring 16 releases the force to bring the slider 15, the vertical plate 17, and the racket 19 to rise rapidly. The racket 19 hits the shell 1 to vibrate it, and the vibration is transmitted to the sealing ring 4 to vibrate it, so as to shake off the debris accumulated on the sealing ring 4, so that the debris moves outward along the inclined shell 1, and cooperates with the blown airflow to further improve the cleaning effect of the debris.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A three-valve seal nitrogen filling structure for a centrifuge, comprising a housing (1), characterized in that: The housing (1) is provided with a shaft sleeve (2) inside, the housing (1) is provided with a mounting groove (3) inside, a sealing ring (4) is provided inside the mounting groove (3), a cleaning assembly for cleaning the sealing ring (4) is provided outside, and a ring plate (5) is provided at one end of the housing (1); The cleaning assembly comprises: an electromagnet (6), an annular magnet (7), a cavity (8) arranged on the shaft sleeve (2), a plurality of inclined holes (9) arranged outside the shaft sleeve (2) and communicating with the cavity (8), a channel (10), a plunger (11), and a tilting assembly for tilting the housing (1); The electromagnet (6) is arc-shaped, an annular cavity is provided at the lower part of the interior of the housing (1), the electromagnet (6) is arranged in the annular cavity, the annular magnet (7) is sleeved on the outside of the sealing ring (4), the channel (10) is arranged on the shaft sleeve (2), one end of the channel (10) is connected to the cavity (8), and the other end is connected to the outside, and the plunger (11) is arranged at one end of the channel (10).

2. The three-valve seal nitrogen filling structure for centrifuge according to claim 1, characterized in that: The sealing ring (4) can move in the mounting groove (3) along an axial direction perpendicular to the shaft sleeve (2); the direction of the magnetic poles generated by the electromagnet (6) when energized is the same as that of the annular magnet (7); and the repulsive force between the electromagnet (6) and the annular magnet (7) is sufficient to overcome gravity and drive the sealing ring (4) to rise and separate from the shaft sleeve (2).

3. The three-valve seal nitrogen filling structure for centrifuge according to claim 2, characterized in that: The tilting assembly comprises: a bracket (12), a connecting plate (13), and a cylinder (14); The bracket (12) is fixedly connected to one side of the top of the housing (1), one end of the connecting plate (13) is rotatably mounted in the bracket (12), the cylinder (14) is fixedly connected to the top of the ring plate (5), and one end of the cylinder rod of the cylinder (14) is fixedly connected to the connecting plate (13).

4. The three-valve seal nitrogen filling structure for centrifuge according to claim 3, characterized in that: A main shaft (23) is arranged inside the shaft sleeve (2), and the shaft sleeve (2) is fixedly connected to the main shaft (23) via a pair of screws (24). A vertical groove is provided at the lower part of the outer side of the shell (1), and a beating component for beating the bottom of the shell (1) is arranged in the vertical groove.

5. The three-valve seal nitrogen filling structure for centrifuge according to claim 4, characterized in that: The beating assembly comprises: a slider (15) slidably arranged in the vertical groove, a spring (16), a vertical plate (17), a driving assembly for driving the vertical plate (17) to descend, and a beating rod (19); The slap rod (19) is arranged at the bottom of the housing (1) and one end is fixedly connected to the vertical plate (17), the vertical plate (17) is fixedly connected to the slider (15), and the spring (16) fixes the bottom end of the slider (15) to the bottom wall of the vertical groove.

6. The three-valve seal nitrogen filling structure for centrifuge according to claim 5, characterized in that: The driving assembly comprises: a push rod (18), an extrusion block (20), and a curved surface (21) arranged on one side of the extrusion block (20); The push rod (18) is fixedly connected to the top of the vertical plate (17), and the extrusion blocks (20) are multiple and equidistantly fixed around the outside of the shaft sleeve (2).

7. The three-valve seal nitrogen filling structure for centrifuge according to claim 6, characterized in that: A sealing gasket (22) is provided between the ring plate (5) and the housing (1).

8. The three-valve seal nitrogen filling structure for centrifuge according to claim 7, characterized in that: The interior of the channel (10) is provided with threads near the plunger (11).

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