Shaft seal device of horizontal centrifuge

Abstract

The utility model relates to the technical field of centrifugal machine sealing, and discloses a shaft sealing device of a horizontal centrifugal machine, which comprises a centrifugal machine main shaft, a sealing ring is arranged around the outer side of the centrifugal machine main shaft, and a sealing assembly is detachably arranged on the inner wall of the sealing ring. The sealing assembly comprises two locking covers which are detachably arranged at the two ends of the sealing ring respectively, and the locking covers are annular and are coaxial with the sealing ring; a plurality of graphite rings, two teflon sealing rings and a plurality of isolating rings are clamped between the two locking covers; the graphite rings and the teflon sealing rings are in contact with the outer wall of the centrifugal machine main shaft; the two polytetrafluoroethylene sealing rings are arranged on the inner sides of the two locking covers respectively, the multiple isolating rings are arranged between the polytetrafluoroethylene sealing rings and the isolating rings and between every two adjacent graphite rings respectively, the whole shaft seal is convenient to mount and dismount, the later maintenance cost is reduced, and the whole shaft seal is stable in structure and good in sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifuge sealing, in particular to a shaft seal device for a horizontal centrifuge. Background Technique

[0002] In the production and manufacturing of cellulose products, it is necessary to centrifuge cellulose. During the manufacturing of the centrifuge, it is necessary to seal the hood seal.

[0003] The original sealing structure used a split sealing seat, which was equally divided by wire cutting. When replacing, it is necessary to disassemble the sealing seat into two halves. Then, the graphite sealing ring is placed in the sealing groove, and then the two halves of the sealing seat are connected. After daily use, the graphite sealing ring and the PTFE sealing ring with a washer will cause sealing failure due to wear and need to be replaced.

[0004] The split sealing seat has high precision requirements for wire cutting. Due to wire cutting, extremely fine gaps appear on the split surface, which need to be treated with sealant. The requirements for the thickness and assembly of the sealant are high, and leakage is likely to occur. In terms of assembly, it is necessary to connect the two halves of the sealing seat, increasing the assembly time. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the technical problem to be solved by the utility model is: how to improve the replacement and installation efficiency of shaft seal structural components.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A shaft seal device for a horizontal centrifuge, including a centrifuge main shaft, a sealing ring is disposed around the outside of the centrifuge main shaft, and a sealing component is detachably disposed on the inner wall of the sealing ring;

[0008] The sealing component includes two locking covers respectively detachably disposed at both ends of the sealing ring. The locking covers are annular and coaxial with the sealing ring; a plurality of graphite rings, two PTFE sealing rings and a plurality of spacer rings are clamped between the two locking covers. The graphite rings and the PTFE sealing rings are both in contact with the outer wall of the centrifuge main shaft; the two PTFE sealing rings are respectively disposed inside the two locking covers, and the plurality of spacer rings are respectively disposed between the PTFE sealing rings and the graphite rings and between two adjacent graphite rings.

[0009] Furthermore, a screw connection structure is disposed between the locking cover and the sealing ring.

[0010] Further, annular mounting grooves are coaxially provided at both ends of the above-mentioned sealing ring. The inner diameter of the above-mentioned mounting grooves is the same as the inner diameter of the above-mentioned sealing ring. The two above-mentioned mounting grooves are not connected. At least one graphite ring, one tetrafluoroethylene sealing ring and at least one isolation ring are provided in the above-mentioned mounting grooves. A locking cover clamps at least one graphite ring, one tetrafluoroethylene sealing ring and at least one isolation ring on the corresponding side in the corresponding above-mentioned mounting groove.

[0011] Further, a nitrogen channel is radially provided on the outer wall of the above-mentioned sealing ring. An inflation gap is provided between the innermost isolation rings in the two above-mentioned mounting grooves. The above-mentioned nitrogen channel communicates with the above-mentioned inflation gap.

[0012] Further, a positioning groove is provided on the above-mentioned locking cover. A positioning protrusion adapted to the above-mentioned positioning groove is provided on the isolation ring close to the above-mentioned locking cover. The corresponding tetrafluoroethylene sealing ring is clamped between the above-mentioned locking cover and the adjacent isolation ring.

[0013] Further, a positioning pin structure is provided between the above-mentioned graphite ring and the above-mentioned sealing ring.

[0014] Further, an O-ring is provided at the outer ring edge of the above-mentioned isolation ring.

[0015] The beneficial effects of the present utility model are as follows:

[0016] Multiple graphite rings, two tetrafluoroethylene sealing rings and multiple isolation rings are clamped and fixed on the inner wall of the sealing ring by two locking covers, which is convenient for installation and disassembly, reduces the later maintenance cost, and the entire shaft seal structure is stable and has good sealing performance. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is the present utility model Figure 1 enlarged view at A;

[0019] Figure 3 is a schematic installation position diagram of the present utility model;

[0020] In the figure, the markings are: 1 - centrifuge main shaft, 2 - sealing ring, 3 - locking cover, 4 - tetrafluoroethylene sealing ring, 5 - isolation ring, 6 - graphite ring, 7 - screw connection structure, 8 - nitrogen channel, 9 - inflation gap, 10 - positioning pin structure, 11 - O-ring, 12 - positioning protrusion. Specific Embodiments

[0021] The present utility model will be further described below with reference to the accompanying drawings.

[0022] As Figures 1 - 3As shown in the figure, an axial seal device for a horizontal centrifuge is proposed in an embodiment of the present application, which includes a centrifuge main shaft 1. A sealing ring 2 is disposed around the outside of the centrifuge main shaft 1, and a sealing assembly is detachably disposed on the inner wall of the sealing ring 2. The sealing assembly includes two locking covers 3 respectively detachably disposed at both ends of the sealing ring 2. The locking covers 3 are annular and coaxial with the sealing ring 2. A plurality of graphite rings 6, two tetrafluoroethylene sealing rings 4, and a plurality of spacer rings 5 are clamped between the two locking covers 3. The graphite rings 6 and the tetrafluoroethylene sealing rings 4 are both in contact with the outer wall of the centrifuge main shaft 1. The two tetrafluoroethylene sealing rings 4 are respectively disposed inside the two locking covers 3, and the plurality of spacer rings 5 are respectively disposed between the adjacent tetrafluoroethylene sealing rings 4 and the graphite rings 6, and between the adjacent two graphite rings 6.

[0023] First of all, it should be stated that by disposing the two locking covers 3 at both ends of the sealing ring 2, a stable clamping gap is formed between the two locking covers 3. A plurality of graphite rings 6, two tetrafluoroethylene sealing rings 4, and a plurality of spacer rings 5 are disposed in the clamping gap. Among them, the two tetrafluoroethylene sealing rings 4 correspond to the two locking covers 3, forming the effect of an elastic gasket to ensure the locking and sealing effect of the locking covers 3. And the inner diameter of the tetrafluoroethylene sealing ring 4 is slightly smaller than the outer diameter of the centrifuge main shaft 1, so that the inner wall of the tetrafluoroethylene sealing ring 4 abuts against the outer wall of the centrifuge main shaft 1 and the inner side of the tetrafluoroethylene sealing ring 4 undergoes elastic deformation, improving the sealing performance. Moreover, the plurality of spacer rings 5 are used to stably clamp the plurality of graphite rings 6 to ensure the installation stability of the graphite rings 6. To disassemble the whole device, only the locking covers 3 need to be removed, and then the tetrafluoroethylene sealing rings 4, spacer rings 5, and graphite rings 6 are taken out in sequence for corresponding replacement and maintenance.

[0024] Specifically, a screw connection structure 7 is disposed between the locking cover 3 and the sealing ring 2. Through a plurality of screws spaced circumferentially along the locking cover 3, the locking cover 3 is stably disposed on the sealing ring 2 through the fixing action of the screws, improving the installation and disassembly efficiency and convenience on the basis of ensuring the installation stability.

[0025] In order to further improve the installation stability, annular installation grooves are coaxially provided at both ends of the sealing ring 2. The inner diameter of the installation groove is the same as the inner diameter of the sealing ring 2, and the two installation grooves are not communicated. At least one graphite ring 6, one tetrafluoroethylene sealing ring 4, and at least one spacer ring 5 are disposed in the installation groove. One locking cover 3 clamps at least one graphite ring 6, one tetrafluoroethylene sealing ring 4, and a plurality of spacer rings 5 on the corresponding side in the corresponding installation groove. That is to say, the installation grooves on both sides of the sealing ring 2 are both installed with a preset graphite ring 6, one tetrafluoroethylene sealing ring 4, and the corresponding number of spacer rings 5, such as Figure 1As shown, during the installation process, a graphite ring 6 is first placed at the innermost side of the installation groove and abuts against the inner wall of the installation groove, and then the isolation ring 5 and other graphite rings 6 are sequentially placed, ensuring that there is an isolation ring 5 between adjacent graphite rings 6. A tetrafluoroethylene sealing ring 4 is clamped and connected between the outermost isolation ring 5 and the corresponding locking cover 3. In one implementation, two graphite rings 6 and two isolation rings 5 are arranged in the installation groove on one side of the sealing ring 2, and one graphite ring 6 and one isolation ring 5 are arranged in the installation groove on the other side, achieving a better sealing effect.

[0026] In the above structure, the graphite ring 6 and the tetrafluoroethylene sealing ring 4 contact the outer wall of the centrifuge main shaft 1. The two tetrafluoroethylene sealing rings 4 are on both sides, and multiple graphite rings 6 are arranged at intervals between the two tetrafluoroethylene sealing rings 4, forming a stable sealing structure. In order to further improve the sealing performance, a nitrogen channel 8 is radially provided on the outer wall of the above sealing ring 2, and an inflation gap 9 is provided between the innermost isolation rings 5 in the two above installation grooves. The nitrogen channel 8 communicates with the inflation gap 9, and nitrogen is filled into the nitrogen channel 8 to enter the inflation gap 9, constituting a gas sealing structure.

[0027] The above locking cover 3 is provided with a positioning groove, and the isolation ring 5 close to the above locking cover 3 is provided with a positioning protrusion 12 adapted to the above positioning groove. The corresponding tetrafluoroethylene sealing ring 4 is clamped between the above locking cover 3 and the adjacent isolation ring 5, improving the clamping stability after installation. The positioning groove and the positioning protrusion 12 are preferably annular and coaxial with the sealing ring 2, improving the positioning efficiency during installation and the cooperation stability between components after installation.

[0028] In addition, a positioning pin structure 10 is provided between the above graphite ring 6 and the above sealing ring 2, ensuring that when the centrifuge main shaft 1 rotates, the graphite ring 6 does not rotate with the centrifuge, ensuring a better sealing effect.

[0029] In order to further improve the sealing performance, an O-ring 11 is provided at the outer ring edge of the above isolation ring 5. The O-ring 11 can be an elastic rubber ring. The O-ring 11 can cooperate with the edge of the graphite ring 6 adjacent to the isolation ring 5 to ensure the sealing performance of the assembly and prevent the input nitrogen from leaking internally.

[0030] In summary, the present utility model proposes a shaft seal device for a horizontal centrifuge, including a centrifuge main shaft 1. A sealing ring 2 is disposed around the outside of the centrifuge main shaft 1, and a sealing assembly is detachably disposed on the inner wall of the sealing ring 2. The sealing assembly includes two locking covers 3 respectively detachably disposed at both ends of the sealing ring 2. The locking covers 3 are annular and coaxial with the sealing ring 2, and the inner diameter of the locking covers 3 is smaller than that of the sealing ring 2. A plurality of graphite rings 6, two tetrafluoroethylene sealing rings 4 and a plurality of spacer rings 5 are clamped between the two locking covers 3. The graphite rings 6 and the tetrafluoroethylene sealing rings 4 are both in contact with the outer wall of the centrifuge main shaft 1. The two tetrafluoroethylene sealing rings 4 are respectively disposed inside the two locking covers 3, and the plurality of spacer rings 5 are respectively disposed between the tetrafluoroethylene sealing rings 4 and the spacer rings 5 and between two adjacent graphite rings 6. The plurality of graphite rings 6, two tetrafluoroethylene sealing rings 4 and a plurality of spacer rings 5 are clamped and fixed on the inner wall of the sealing ring 2 by the two locking covers 3, which is convenient for installation and disassembly, reduces the later maintenance cost, and further improves the sealing performance by introducing nitrogen to form a gas seal structure.

Claims

1. A shaft seal device for a horizontal centrifuge, characterized in that, The centrifuge main shaft (1) is provided with a sealing ring (2) surrounding the outer side of the centrifuge main shaft (1), and a sealing component is detachably provided on the inner wall of the sealing ring (2); The sealing assembly comprises two locking covers (3) which are detachably arranged at both ends of the sealing ring (2), the locking covers (3) being annular and coaxial with the sealing ring (2); a plurality of graphite rings (6), two polytetrafluoroethylene sealing rings (4) and a plurality of isolation rings (5) are sandwiched between the two locking covers (3), the inner walls of the graphite rings (6) and the polytetrafluoroethylene sealing rings (4) both contact the outer wall of the centrifuge main shaft (1); the two polytetrafluoroethylene sealing rings (4) are respectively arranged on the inner sides of the two locking covers (3), and the plurality of isolation rings (5) are respectively arranged between adjacent polytetrafluoroethylene sealing rings (4) and the graphite rings (6), and between two adjacent graphite rings (6).

2. The shaft sealing device of a horizontal centrifuge according to claim 1, characterized in that: A screw connection structure (7) is provided between the locking cover (3) and the sealing ring (2).

3. The shaft sealing device of a horizontal centrifuge according to claim 1, characterized in that: Both ends of the sealing ring (2) are coaxially provided with annular mounting grooves, the inner diameter of the mounting grooves being the same as the inner diameter of the sealing ring (2), the two mounting grooves being not connected, the mounting grooves being provided with at least one graphite ring (6), one polytetrafluoroethylene sealing ring (4) and at least one isolating ring (5), and one locking cover (3) clamps the at least one graphite ring (6), one polytetrafluoroethylene sealing ring (4) and at least one isolating ring (5) on the corresponding side in the corresponding mounting groove.

4. The shaft seal device of a horizontal centrifuge according to claim 3, characterized in that, A nitrogen channel (8) is radially provided on the outer wall of the sealing ring (2), and an air-filled gap (9) is provided between the innermost isolation rings (5) in the two mounting grooves, and the nitrogen channel (8) is connected to the air-filled gap (9).

5. The shaft sealing device of a horizontal centrifuge according to claim 1, characterized in that: The locking cover (3) is provided with a positioning groove, and the isolation ring (5) close to the locking cover (3) is provided with a positioning protrusion (12) adapted to the positioning groove, and the corresponding polytetrafluoroethylene sealing ring (4) is clamped between the locking cover (3) and the adjacent isolation ring (5).

6. The shaft seal device of a horizontal centrifuge according to claim 1, characterized in that, A positioning pin structure (10) is provided between the graphite ring (6) and the sealing ring (2).

7. The shaft seal device of a horizontal centrifuge according to claim 1, characterized in that, An O-ring (11) is provided at the outer edge of the isolation ring (5).

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