CN211275037U

CN211275037U - Sealing structure of disc separator

Info

Publication number: CN211275037U
Application number: CN201922159233.7U
Authority: CN
Inventors: 牟宇慧; 牟富君; 王斌
Original assignee: Jiangsu Juneng Machinery Co ltd
Current assignee: Jiangsu Juneng Machinery Co ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-08-18
Anticipated expiration: 2029-12-05

Abstract

The utility model discloses a sealing structure of a disc separator.A disc rack is arranged in the shell of a rotary drum, the interior of the rotary drum is communicated with a feed inlet through a feed channel, is communicated with a heavy phase outlet through a heavy phase runner and is communicated with a light phase outlet through a light phase runner; a plurality of second blades are arranged at the upper part of the feeding cavity, the second blades are obliquely arranged, and when the rotary drum rotates, local downward air pressure can be generated. The utility model discloses upper portion at the feeding chamber sets up the second blade, and the second blade can be helical blade or swash plate blade, and the equipartition just sets up certain inclination in the passageway, to the produced aerial fog of the upward motion that volatilizees of the material that the feeding velocity of flow is very high, the second blade can form local atmospheric pressure on feeding chamber upper portion and push back to feedstock channel's material aerial fog in the feeding chamber downwards to avoid most material aerial fog to get into the light phase passageway.

Description

Sealing structure of disc separator

Technical Field

The utility model belongs to the technical field of separating centrifuge equipment technique and specifically relates to a seal structure of dish formula separating centrifuge of high-accuracy separation effect.

Background

The disc type centrifuge is one of the sedimentation centrifuge, the rotary drum of which is arranged at the upper end of a vertical shaft and is driven by a motor through a transmission device to rotate at high speed, and the separation of materials is realized by utilizing the centrifugal separation technology. The disc separator is used for separating materials which are difficult to separate by gravity settling, two liquids which are not mutually soluble and have similar densities are in a centrifugal force field generated by the high-speed rotation of the rotary drum, and centrifugal forces generated by the materials with different densities are different, so that the separation of the two materials is realized. In the process of separating materials, a disc separator is usually used to separate three phases of heavy phase (such as water), light phase (such as oil) and solid phase in the materials. At present, the water content of clean oil after oil separation is usually more than 3000ppm, and for some special industries with higher oil separation effect requirement and lower water content requirement, the separation requirement of the conventional disc separator can not meet the requirement of the special industries.

In the existing discharging system of a disc separator for separating oil from water of mineral oil, gaps exist between a light-phase discharging channel and a heavy-phase discharging channel and between the light-phase discharging channel and a feeding cavity, in the separating process, trace leakage can be generated between the heavy-phase discharging channel and the light-phase discharging channel and between the feeding cavity and the light-phase discharging channel, the heavy phase and the light phase in the leaked material are mixed, heavy-phase components in the light phase are increased, the separating effect is influenced, and the water content in the separated light phase is higher.

SUMMERY OF THE UTILITY MODEL

The applicant provides a sealing structure of a disc separator with a reasonable structure, aiming at the defects that trace leakage can be generated between a heavy phase discharging channel and a light phase discharging channel, between a feeding cavity and the light phase discharging channel, and the separation effect is influenced, and the like of the discharging system of the disc separator, so that the cross contamination between the light phase and the heavy phase and between the light phase and the material to be separated is avoided, and the oil-water separation effect is ensured.

The utility model discloses the technical scheme who adopts as follows:

a sealing structure of a disc separator is characterized in that a disc rack is arranged in a shell of a rotary drum, the interior of the rotary drum is communicated with a feed inlet through a feed channel, is communicated with a heavy phase outlet through a heavy phase flow channel and is communicated with a light phase outlet through a light phase flow channel; a plurality of second blades are arranged at the upper part of the feeding cavity, the second blades are obliquely arranged, and when the rotary drum rotates, local downward air pressure can be generated.

As a further improvement of the above technical solution:

the second blade is a helical blade or a sloping plate blade.

The second blade is arranged on the movable part or the static part.

The second blades are multiple and are uniformly arranged at equal angles.

The utility model discloses upper portion at the feeding chamber sets up the second blade, the second blade can be helical blade or swash plate blade, the equipartition just sets up certain inclination in the passageway, to the produced aerial fog of the upward motion that volatilizees of the material that the feeding velocity of flow is very high, the second blade can form local downward atmospheric pressure on feeding chamber upper portion and push back to feedstock cavity's material aerial fog downwards in the feedstock cavity, thereby avoid most material aerial fog to get into light looks passageway, and further adopt second labyrinth clearance to seal to keep apart through material aerial fog a small amount of.

A first labyrinth gap is arranged between the light phase flow passage and the heavy phase flow passage.

A disc gland is arranged above the disc frame, a first sleeve is embedded in the upper end opening of the disc gland, a plurality of rings of fourth convex rings protrude upwards from the upper surface of the first sleeve, and a fourth ring groove is formed between every two adjacent rings of the fourth convex rings; the lower surface of the heavy phase centripetal pump protrudes downwards for a plurality of circles of fifth convex rings, and a fifth ring groove is formed between every two adjacent circles of fifth convex rings; the first labyrinth clearance is a zigzag path formed by the fourth convex ring and the fourth ring groove of the first sleeve and the fifth convex ring and the fifth ring groove of the heavy phase centripetal pump in a staggered manner.

A first labyrinth gap is arranged between the light phase flow passage and the heavy phase flow passage, and labyrinth sealing is realized between the light phase flow passage and the heavy phase flow passage by the first labyrinth gap, so that the situation that the water content of the light phase is increased and the light phase separation effect is influenced because materials in the heavy phase flow passage leak into the light phase flow passage is avoided. The utility model discloses adopt labyrinth to seal in adjacent runner, avoided between light phase and the heavy phase, light phase and treat the cross contamination between the separation material, ensured oil-water separation's effect.

A second labyrinth gap is arranged between the light phase flow channel and the feeding channel.

A second external member is embedded in the upper end opening of the disc rack, the upper surface of the second external member is upwards protruded with a plurality of circles of third convex rings, and a third ring groove is formed between every two adjacent circles of third convex rings; the lower surface of the light-phase centripetal pump protrudes downwards for a plurality of circles of first convex rings, and first annular grooves are formed between every two adjacent first convex rings; the second labyrinth gap is a zigzag path formed by the mutual staggering of a third convex ring and a third annular groove of the second sleeve and a first convex ring and a first annular groove of the light-phase centripetal pump.

The second vane is disposed before the second labyrinth gap.

The second labyrinth gap is arranged between the light phase flow channel and the feeding cavity, so that the situation that the water content of the light phase is increased and the light phase separation effect is influenced because the material in the feeding cavity leaks into the light phase flow channel is avoided.

The utility model has the advantages as follows:

the utility model discloses upper portion at the feeding chamber sets up the second blade, the second blade can be helical blade or swash plate blade, the equipartition just sets up certain inclination in the passageway, to the produced aerial fog of the upward motion that volatilizees of the material that the feeding velocity of flow is very high, the second blade can form local downward atmospheric pressure on feeding chamber upper portion and push back to feedstock cavity's material aerial fog downwards in the feedstock cavity, thereby avoid most material aerial fog to get into light looks passageway, and further adopt second labyrinth clearance to seal to keep apart through material aerial fog a small amount of. The second labyrinth gap is arranged between the light phase flow channel and the feeding cavity, so that the situation that the water content of the light phase is increased and the light phase separation effect is influenced because the material in the feeding cavity leaks into the light phase flow channel is avoided. A first labyrinth gap is arranged between the light phase flow passage and the heavy phase flow passage, and labyrinth sealing is realized between the light phase flow passage and the heavy phase flow passage by the first labyrinth gap, so that the situation that the water content of the light phase is increased and the light phase separation effect is influenced because materials in the heavy phase flow passage leak into the light phase flow passage is avoided. The utility model discloses adopt labyrinth to seal in adjacent runner, avoided between light phase and the heavy phase, light phase and treat the cross contamination between the separation material, ensured oil-water separation's effect.

Drawings

Fig. 1 is a top view of a conventional disc.

Fig. 2 is a sectional view of the disc separator of the present invention.

Fig. 3 is an enlarged view of a portion a in fig. 2, showing the present invention.

Fig. 4 is a perspective view of a cyclone according to the first embodiment.

FIG. 5 is a cross-sectional view of a cyclone according to a second embodiment.

Fig. 6 is a top view of the disc of the present invention.

In the figure: 1. a housing; 2. a disc holder; 3. a heavy phase centripetal pump; 4. a feed pipe; 5. a feed channel; 6. a feed inlet; 7. a light phase outlet; 8. a light phase upper flow channel; 9. a heavy phase outlet; 10. a heavy phase upper flow channel; 11. a rephasing collection area; 12. a first kit; 13. a light phase centripetal pump; 14. a heavy phase lower runner; 15. a second kit; 16. a disc gland; 17. a disc; 18. a diverter tray; 19. a neutral pore; 20. a swirler; 21. a feed cavity; 22. a separation chamber; 23. a light phase convergence zone; 24. a light phase lower runner; 25. a flow guide channel; 26. a first ring groove; 27. a first convex ring; 30. a third ring groove; 31. a third convex ring; 32. a fourth ring groove; 33. a fourth convex ring; 34. a fifth bulge loop; 35. a fifth ring groove; 36. a first labyrinth gap; 37. a second labyrinth gap; 38. a central shaft; 39. a first blade; 40. a sleeve; 41. an external thread; 42. a parting strip; 43. a dispensing aperture; 44. a second blade.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

The first embodiment is as follows:

as shown in fig. 2, the disc separator of the present invention comprises a rotary drum and a central feeding pipe 4, a disc frame 2 is arranged in the inner cavity of the casing 1 of the rotary drum, and the disc frame 2 divides the inner cavity of the casing 1 into a feeding cavity 21 and a separation cavity 22; the shell 1 and the disc frame 2 of the rotary drum are both moving parts which move in a rotary manner, and the feeding pipe 4 is a non-rotary static part; a disk gland 16 and a plurality of conical disks 17 are sequentially arranged on the disk frame 2 from top to bottom on one side of the separation cavity 22, a heavy-phase lower flow channel 14 is formed between the outer wall surface of the disk gland 16 and the inner wall surface of the shell 1, a light-phase lower flow channel 24 is formed between the outer wall surface of the disk frame 2 and the inner sides of the plurality of disks 17, and the heavy-phase lower flow channel 14 and the light-phase lower flow channel 24 are both communicated with the separation cavity 22; the separation cavity 22 is divided into a plurality of thin-layer separation spaces by the plurality of discs 17, so that the sedimentation distance is shortened, the sedimentation area is increased, and the separation effect is improved; the bottom of the disc frame 2 is a conical splitter plate 18, a plurality of neutral holes 19 are uniformly formed in the splitter plate 18 along the circumferential direction, the neutral holes 19 are communicated with a feeding cavity 21 and a separation cavity 22, and materials in the feeding cavity 21 enter the separation cavity 22 through the neutral holes 19. A heavy phase centripetal pump 3 is arranged at an opening at the upper end of the shell 1, the heavy phase centripetal pump 3 is positioned above the disc rack 2, and the lower end surface of the heavy phase centripetal pump is a certain distance away from the upper end surface of the disc rack 2; the heavy phase centripetal pump 3 is provided with a heavy phase upper flow passage 10, the heavy phase upper flow passage 10 is communicated with a heavy phase outlet 9, and a heavy phase lower flow passage 14 in the rotary drum is communicated with the heavy phase outlet 9 through the heavy phase centripetal pump 3. A feeding pipe 4 is arranged on the heavy phase centripetal pump 3, the lower part of the feeding pipe 4 extends into the feeding cavity 21, a feeding channel 5 is arranged inside the feeding pipe 4, and the feeding channel 5 is communicated with a feeding hole 6; a light phase upper flow passage 8 is arranged between the feeding pipe 4 and the heavy phase centripetal pump 3, and the light phase upper flow passage 8 is communicated with a light phase outlet 7; a light phase centripetal pump 13 is arranged on the periphery of the feeding pipe 4, below the heavy phase centripetal pump 3 and above the disc rack 2, and a certain distance is reserved between the lower surface of the light phase centripetal pump 13 and the upper surface of the disc rack 2; the light phase centripetal pump 13 is radially provided with a through flow guide channel 25, and the flow guide channel 25 is communicated with the light phase upper flow channel 8.

As shown in fig. 2 and 3, a heavy phase collecting area 11 is formed between the outer surface of the heavy phase centripetal pump 3 and the corresponding inner surface of the housing 1, as shown in fig. 3, the heavy phase collecting area 11 is respectively communicated with the heavy phase upper flow passage 10 and the heavy phase lower flow passage 14, the heavy phase upper flow passage 10, the heavy phase lower flow passage 14 and the heavy phase collecting area 11 form a heavy phase flow passage, and the separation cavity 22 is communicated with the heavy phase outlet 9 through the heavy phase flow passage. As shown in fig. 4, the lower surface of the heavy phase centripetal pump 3 is provided with a plurality of circles of fifth convex rings 34 protruding downwards along the axial direction, and a fifth annular groove 35 is formed between every two adjacent circles of fifth convex rings 34.

As shown in fig. 2 and 3, the upper port of the disc gland 16 is embedded with the first sleeve 12, and the upper portion of the first sleeve 12 extends from the upper end of the disc gland 16. The upper surface of the first sleeve 12 is upwardly protruded with a plurality of circles of fourth convex rings 33 corresponding to the fifth ring grooves 35, and a fourth ring groove 32 is formed between two adjacent circles of fourth convex rings 33. The fourth annular ridge 33 extends into the fifth annular groove 35 and the fifth annular ridge 34 extends into the fourth annular groove 32 to form a first labyrinth gap 36 of alternating, tortuous path.

As shown in fig. 2 and 3, the first sleeve 12 is sleeved on the periphery of the light phase centripetal pump 13, a light phase collecting area 23 is formed between the inner surface of the first sleeve 12 and the outer surface of the light phase centripetal pump 13, and the light phase collecting area 23 is respectively communicated with the light phase lower runner 24 and the flow guide channel 25; the light phase upper flow passage 8, the light phase lower flow passage 24, the flow guide passage 25 and the light phase collecting area 23 form a light phase flow passage, and the separation cavity 22 is communicated with the light phase outlet 7 through the light phase flow passage. The lower surface of the light phase centripetal pump 13 is downwardly protruded with a plurality of circles of first convex rings 27, and a first ring groove 26 is formed between two adjacent circles of first convex rings 27.

As shown in fig. 2 and 3, the second sleeve member 15 is inserted into the upper opening of the disk holder 2, the upper portion of the second sleeve member 15 extends from the upper end of the disk holder 2, and the second sleeve member 15 rotates at a high speed with the disk holder 2 and is a moving member. The upper surface of the second sleeve 15 is raised upwards by several circles of third protruding rings 31, and a third ring groove 30 is formed between two adjacent circles of third protruding rings 31. The third projecting ring 31 extends into the first ring groove 26 and the first projecting ring 27 extends into the third ring groove 30 to form a second labyrinth gap 37 of alternating, tortuous path. A plurality of second blades 44 are fixedly arranged on the inner circumferential surface of the lower part of the second sleeve 15 and positioned on the periphery of the feeding pipe 4, the second blades 44 are positioned on the upper part of the feeding cavity 21 and are arranged in front of the second labyrinth gap 37, and the second blades 44 can be helical blades or inclined plate blades which are uniformly distributed in the channel and are provided with a certain inclination angle; in this embodiment, four inclined plate blades are arranged at the upper part of the feeding cavity 21; because the feeding velocity of flow of material is high, therefore can take place a large amount of atomizing and volatilize upward movement, the aerial fog will influence the purity of light phase if getting into in the light phase passageway, and second blade 44 moves with second external member 15 jointly at a high speed, can form local downward atmospheric pressure on feeding chamber 21 upper portion and push back to feed channel 5 with the material aerial fog in the feeding chamber 21 downwards to avoid most material aerial fog to get into the light phase runner, and further adopt second labyrinth clearance 37 to seal a small amount of material aerial fog that passes through and keep apart.

As shown in fig. 3, a first labyrinth gap 36 is provided between the light phase flow channel and the heavy phase flow channel, and a second labyrinth gap 37 and a second vane 44 are provided between the light phase flow channel and the feeding cavity 21; the first labyrinth gap 36 realizes labyrinth sealing between the light phase flow passage and the heavy phase flow passage, and prevents the material in the heavy phase flow passage from leaking into the light phase flow passage to increase the water content of the light phase and influence the light phase separation effect. The second labyrinth gap 37 and the second blades 44 realize labyrinth sealing between the light-phase flow passage and the feeding cavity 21, so that the situation that the water content of the light phase is increased due to the fact that materials in the feeding cavity 21 leak into the light-phase flow passage to influence the light-phase separation effect is avoided. The utility model discloses adopt labyrinth to seal in adjacent runner, avoided between light phase and the heavy phase, light phase and treat the cross contamination between the separation material, ensured oil-water separation's effect.

As shown in fig. 2, the lower end of the feed pipe 4 in the feed chamber 21 is fixedly provided with a cyclone 20, and the cyclone 20 is located in the feed channel 5. As shown in fig. 4, the first blades 39 formed in a spiral shape are spirally formed on the outer peripheral surface of the cylindrical central shaft 38 of the cyclone 20 in the axial direction, and the liquid outlet rotation direction of the first blades 39 coincides with the rotation direction of the rotary drum; in this embodiment, three mutually parallel spiral first blades 39 are uniformly arranged on the outer periphery of the central shaft 38, and the adjacent first blades 39 are arranged at 120 degrees. As shown in fig. 2, each first blade 39 is fixed to the inner peripheral surface or mouth of the feed pipe 4 by welding. The material flows through the cyclone 20 and then enters the feeding cavity 21, the cyclone 20 accelerates the material to a higher rotating speed, so that the material has an initial speed and rotates to enter the feeding cavity 21, on one hand, the material has a rotating centrifugal force when entering the feeding cavity 21, the material is uniformly guided into the feeding cavity 21 under the action of the rotating centrifugal force, the material flow of each part in the feeding cavity 21 is uniform, and the moisture in the material of each part in the feeding cavity 21 is uniformly and fully separated; in addition, under the action of the initial rotating centrifugal force, the materials preliminarily separate oil and water, namely, the materials preliminarily separate oil and water in the feeding cavity 21, so that the water content of a light phase entering the separating cavity 22 from the feeding cavity 21 is reduced, the materials are favorable for fully separating the water in the separating cavity 22, the separating effect of the light phase is ensured, and the water content of the separated light phase is low; in addition, the spiral feeding direction is consistent with the rotating direction of the rotary drum, when the materials enter the inside of the rotary drum, the impact of the materials on the distributor is reduced, the emulsification of the materials is reduced, and the separation efficiency is improved. And the material which is rotated into the feeding cavity 21 can avoid the material concentration formed in the center of the disc frame 2, thereby forming solid phase deposition. When the input material flow is large, the initial speed of the spiral downward can prevent the material from moving upwards along the axial direction, and the risk of mixing the material to be separated and the light phase is reduced.

As shown in fig. 2, the disc 17 is a conical body, as shown in fig. 6, a plurality of parting strips 42 are arranged on the conical wall surface along the axial direction, the plurality of parting strips 42 are uniformly distributed along the radial direction, a through distribution hole 43 is formed between two adjacent parting strips 42 and at the lower part of the conical wall surface, the distribution hole 43 is arranged at the position close to the parting strip 42 in the front of the rotating and advancing direction of the rotating drum, and compared with the existing disc 17, the area between the distribution hole 43 and the rear parting strip 42 is enlarged by about one time. After the material enters the disc 17 from the distribution hole 43, the material rotates along the direction of the partition bar 42 facing the rear direction on the surface of the disc 17 under the action of centrifugal force and generates vortex, and as the area between the distribution hole 43 and the partition bar 42 at the rear direction is enlarged, under the same working condition, the water phase in the material is fully diffused in the flow field area between the distribution hole 43 and the partition bar 42 at the rear direction, so that the volume fraction of the water phase in the flow field area is reduced, the oil-water separation effect is improved, and the water content in the separated light phase is low. The surface of the disc 17 is precisely finished or a coating is added on the surface of the disc 17, the coating material can be Teflon and the like, so that the surface smoothness of the disc 17 is improved, the friction coefficient of the surface is reduced, the surface tension between the material and the surface of the disc 17 is further reduced, the separation of a light phase and a heavy phase between the discs 17 is facilitated, and the separation precision is improved.

Example two:

with the structural features of the disc separator of the present invention as in the first embodiment, the cyclone 20 can be further shown in fig. 5, the cyclone 20 includes a central shaft 38, a first blade 39, and a sleeve 40, and the sleeve 40 has a through central hole inside; the first blade 39 is spirally wound on the outer circumferential surface of the central shaft 38 along the axial direction, the outer circumference of the first blade 39 is fixed on the inner circumferential surface of a cylindrical sleeve 40 by welding, and the upper part of the outer circumferential surface of the sleeve 40 is provided with an external thread 41; the inner circumferential surface of the lower part of the feed pipe 4 is correspondingly provided with internal threads, and the swirler 20 is screwed and fixed on the feed pipe 4 through the threads.

When the disc separator is in actual use, the disc frame 2, the disc 17 and the disc gland 16 rotate along with the rotary drum, materials to be separated (such as mineral oil) enter the feeding pipe 4 from the feeding hole 6, flow through the cyclone 20 at the lower end of the feeding pipe 4 to perform preliminary rotation acceleration, then enter the feeding cavity 21 of the rotary drum, and perform preliminary oil-water separation in the feeding cavity 21; the material after the preliminary oil-water separation enters the separation cavity 22 through the neutral hole 19, then enters the surface of the disc 17 through the distribution hole 43 on the disc 17 to do centrifugal rotation movement, heavy phases (such as water and the like) with higher density are thrown outwards to the heavy phase lower flow channel 14 under the action of centrifugal force of high-speed rotation, then flow upwards into the heavy phase centripetal pump 3 through the heavy phase collection area 11, and the kinetic energy of rotation is converted into upward potential energy through the heavy phase centripetal pump 3 and finally discharged from the heavy phase outlet 9; the light phase (clean oil) with lower density moves towards the inner side of the disc 17 along the surface of the disc, is collected into the light phase lower flow channel 24, continues to move upwards under the action of centrifugal force, flows into the light phase centripetal pump 13 through the light phase collection area 23, converts the rotating kinetic energy into upward potential energy through the light phase centripetal pump 13, then flows to the light phase upper flow channel 8 through the flow guide channel 25, and is finally discharged from the light phase outlet 7. After the materials to be separated are subjected to preliminary oil-water separation by the cyclone 20, the water content of the materials entering the separation cavity 22 from the feeding cavity 21 is reduced; the material entering the separation cavity 22 is further subjected to oil-water separation on the disc 17, and because the area between the distribution hole 43 and the rear partition bar 42 on the disc 17 is increased, and the surface smoothness of the disc 17 is high, the material is subjected to sufficient oil-water separation in the separation cavity 22, and the separation effect is good. And labyrinth seals are adopted among the light phase collecting area 23 for outputting the light phase, the light phase upper flow passage 8, the heavy phase lower flow passage 14 and the feeding cavity 21, so that the separation effect of the light phase is ensured. The material of waiting to separate is through the utility model discloses carry out oil water separation after, the moisture content after the oil separation can reach below 5-100ppm, has greatly improved oil water separation's precision, can satisfy the special industry demand that separation effect requires higher, the moisture content requires lower.

The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention. All the structural characteristics of the utility model can be applied to the disc separator for separating materials with different densities such as two phases or three phases. For example, according to the precision requirement of oil-water separation, one or more spiral first blades 39 may be disposed on the cyclone 20, as long as the purpose of providing the material with preliminary rotational acceleration is achieved. The first spiral blade 39 of the cyclone 20 can be arranged on the whole length of the feeding channel 5 of the feeding pipe 4, the material to be separated can obtain a longer acceleration rotation stroke in the feeding channel 5, a higher acceleration rotation speed is obtained, the preliminary oil-water separation effect of the material is better, and the oil-water separation precision is provided. The cyclone 20 may also be fixed to the feed pipe 4 by other means, such as a snap fit or the like. A spiral first blade 39 may be directly welded and fixed to the lower end surface of the feed pipe 4, and the first blade 39 is located on the feed passage 5. The first blades 39 may also be swash plate blades, which are uniformly distributed in the feed channel 5 and set at a certain inclination angle, and the outlet rotation direction of the swash plate blades is consistent with the rotation direction of the rotary drum. The cyclone 20 may also be provided without the central shaft 38, the outer periphery or end surface of the first vanes 39 being fixed directly in the feed pipe 4. The second blade 44 may be fixed to a position corresponding to the outer peripheral surface of the feed pipe 4, which is a stationary member, as long as a downward partial air pressure is formed in the upper portion of the feed chamber 21. The second blades 44 may be one or more, and are uniformly disposed at equal angles, as long as the purpose of forming a downward local air pressure at the upper part of the feeding cavity 21 is achieved.

Claims

1. A sealing structure of a disc separator is characterized in that a disc frame (2) is arranged in a shell (1) of a rotary drum, the interior of the rotary drum is communicated with a feed inlet (6) through a feed channel (5), communicated with a heavy phase outlet (9) through a heavy phase flow channel and communicated with a light phase outlet (7) through a light phase flow channel; the method is characterized in that: a plurality of second blades (44) are arranged at the upper part of the feeding cavity (21), the second blades (44) are obliquely arranged, and when the rotary drum rotates, local downward air pressure can be generated.

2. A seal structure of a disk separator according to claim 1, wherein: the second blade (44) is a helical blade or a swash plate blade.

3. A seal structure of a disk separator according to claim 1, wherein: the second vane (44) is disposed on the movable or stationary member.

4. A seal structure of a disk separator according to claim 1, wherein: the second blades (44) are multiple and are uniformly arranged at equal angles.

5. A seal structure of a disk separator according to claim 1, wherein: a first labyrinth gap (36) is provided between the light phase flow channel and the heavy phase flow channel.

6. A seal structure of a disk separator according to claim 5, wherein: a disc gland (16) is arranged above the disc frame (2), a first sleeve piece (12) is embedded in an upper end opening of the disc gland (16), a plurality of circles of fourth convex rings (33) protrude upwards from the upper surface of the first sleeve piece (12), and a fourth annular groove (32) is formed between every two adjacent circles of fourth convex rings (33); the lower surface of the heavy phase centripetal pump (3) protrudes downwards for a plurality of circles of fifth convex rings (34), and a fifth ring groove (35) is formed between every two adjacent circles of fifth convex rings (34); the first labyrinth gap (36) is a zigzag path formed by the fourth convex ring (33) and the fourth annular groove (32) of the first sleeve (12) and the fifth convex ring (34) and the fifth annular groove (35) of the heavy phase centripetal pump (3) in a mutually staggered mode.

7. A seal structure of a disk separator according to claim 1, wherein: a second labyrinth gap (37) is provided between the light phase flow channel and the feed channel (5).

8. A seal structure of a disk separator according to claim 7, wherein: a second sleeve (15) is embedded in the upper end opening of the disc rack (2), the upper surface of the second sleeve (15) protrudes upwards for a plurality of circles of third convex rings (31), and a third annular groove (30) is formed between every two adjacent circles of third convex rings (31); the lower surface of the light-phase centripetal pump (13) protrudes downwards for a plurality of circles of first convex rings (27), and a first annular groove (26) is formed between every two adjacent first convex rings (27); the second labyrinth gap (37) is a zigzag path formed by the mutual staggering of a third convex ring (31) and a third annular groove (30) of the second sleeve (15), a first convex ring (27) and a first annular groove (26) of the light-phase centripetal pump (13).

9. A seal structure of a disk separator according to claim 1 or 7, wherein: the second blade (44) is arranged in front of the second labyrinth gap (37).