Novel granulator unit nitrogen seal

Abstract

This utility model relates to a novel nitrogen seal for a granulator unit, belonging to the technical field of sealing devices. It includes a mounting plate assembly fixedly connected to the equipment base; a stationary ring assembly A is fixedly connected to one side of the mounting plate assembly, and a stationary ring assembly B is movably connected to the other side. A rotating ring assembly is sandwiched between stationary ring assemblies A and B; the rotating ring assembly is sealed to a rotating shaft; a spring seat assembly is provided on one side of stationary ring assembly B, with several springs evenly distributed on the spring seat assembly, which is elastically connected to stationary ring assembly B via the springs; several adjusting bolts are provided on the spring seat assembly, passing through the springs and stationary ring assembly B, and then threadedly connected to the mounting plate assembly; this utility model controls the pressure of the springs on stationary ring assembly B by rotating the adjusting bolts, maintaining a balance of clamping force and preventing leakage caused by misalignment of the rotating and stationary rings; simultaneously, threaded grooves are provided within the sealing strip to reduce the adhesion of the sealing strip and ensure sealing performance.

Description

Technical Field

[0001] This utility model relates to a novel nitrogen seal for a granulation unit, belonging to the technical field of sealing devices. Background Technology

[0002] In the extrusion granulation system of a high-density polyethylene unit in a plastics factory, the nitrogen seal is located on the gearbox side of the mixer. Externally supplied purging nitrogen, combined with the elastic replenishment of the sealing gland, forms a double-end seal to seal the material inside the mixer. This nitrogen seal has the following defects:

[0003] 1. The sealing gland of this nitrogen gas seal is directly tightened by the bolt pressing down on the spring. Since there is no reference between the bolts and the springs, it is impossible to control the balance of the clamping force, which can easily lead to the skew of the moving ring and the stationary ring, resulting in leakage. At the same time, since each spring is pressed under the bolt, when the circumferential resistance is different, the force applied by each spring is different, which can also easily cause the moving ring and the stationary ring to be skewed, resulting in leakage.

[0004] 2. The clamping force of each spring cannot be controlled. After installation, it is easy to cause excessive clamping force between the sealing cover and the rotating ring, resulting in wear of the rotating and stationary rings and excessive load on the sealing strip.

[0005] 3. The contact surface between the sealing strip and the rotating shaft is an arc surface with a large contact area, which makes it prone to hardening and deformation during long-term operation. Furthermore, since the sealing strip is tightly attached to the shaft, it is equivalent to an intermediate body between the two moving rings. During the sealing gland tightening process, the sealing strip needs to move axially to achieve the effect of tightening the inner moving ring and stationary ring. However, due to the good adhesion of the sealing strip, it is not easy to move. Utility Model Content

[0006] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a novel nitrogen seal for a granulator unit, which, after installation, can ensure the balance of the forces of each spring, avoid leakage caused by the misalignment of the moving and stationary rings, and at the same time avoid excessive spring clamping force, which would cause wear of the moving and stationary rings, reduce the adhesion of the sealing strip, and make the sealing strip easy to move with the compression of the moving and stationary rings, thus ensuring the sealing performance.

[0007] The novel nitrogen seal for the granulator unit of this utility model includes a mounting plate assembly, which is fixedly connected to the equipment base. The mounting plate assembly has a through hole for the rotating shaft to pass through. A stationary ring assembly A is fixedly connected to one side of the mounting plate assembly, and a stationary ring assembly B is movably connected to the other side. A rotating ring assembly is sandwiched between stationary ring assembly A and stationary ring assembly B. The rotating ring assembly is sealed to the rotating shaft and rotates with it. A spring seat assembly is provided on one side of stationary ring assembly B, and several springs are evenly distributed on the spring seat assembly. The spring seat assembly is elastically connected to stationary ring assembly B through the springs. Pressure is applied to stationary ring assembly B by the springs, causing stationary ring assembly B, rotating ring assembly, and stationary ring assembly A to fit tightly together in sequence, thereby forming a seal between stationary ring assembly B and rotating ring assembly, and between rotating ring assembly and stationary ring assembly A.

[0008] The spring seat assembly is provided with several adjusting bolts. The adjusting bolts pass through the spring and the stationary ring assembly B and are threadedly connected to the mounting plate assembly. When the adjusting bolts are rotated, the distance between the spring seat assembly and the stationary ring assembly B can be changed, thereby adjusting the compression of the spring and controlling the pressure of the spring on the stationary ring assembly B.

[0009] Preferably, the rotating ring assembly includes a rotating ring and a sealing strip, with two rotating rings and the sealing strip sandwiched between the two rotating rings for a sealed connection.

[0010] Furthermore, the outer edge of the sealing strip is uniformly provided with several arc-shaped protrusions, and the moving ring is provided with arc-shaped grooves that match the arc-shaped protrusions. The arc-shaped protrusions are embedded in the arc-shaped grooves, which serve to position and transmit torque.

[0011] Furthermore, the moving ring is also provided with a plug-in boss and a plug-in groove. When the moving ring assembly is clamped by the stationary ring assembly A and the stationary ring assembly B, the plug-in boss on one side of the moving ring of the sealing strip is inserted into the plug-in groove on the other side of the moving ring, so that the two moving rings help to lock each other, thereby reducing the load on the sealing strip.

[0012] Preferably, the inner ring of the sealing strip is provided with a threaded groove, which is set according to the direction of rotation. The threaded groove seals with the rotating shaft, while reducing the contact area between the sealing strip and the rotating shaft and reducing the adhesion of the sealing strip.

[0013] Preferably, the mounting plate assembly includes an upper mounting plate and a lower mounting plate, which are connected by bolts.

[0014] Preferably, the stationary ring assembly A includes an upper half ring and a lower half ring, which are connected by bolts.

[0015] Preferably, the stationary ring assembly B includes a left half-ring, a middle ring, and a right half-ring, with the left half-ring and the right half-ring respectively fixed to both sides of the middle ring by bolts.

[0016] Preferably, the spring seat assembly includes a left spring seat, a middle spring seat, and a right spring seat, with the left and right spring seats respectively fixed to both sides of the middle spring seat by bolts.

[0017] The mounting plate assembly, stationary ring assembly A, stationary ring assembly B, and spring seat assembly are all designed as separate units to facilitate installation, disassembly, and maintenance.

[0018] The advantages of this utility model compared with the prior art are:

[0019] The novel nitrogen seal for the granulator unit described in this utility model elastically connects the spring seat assembly and the stationary ring assembly B. The pressure of the springs on the stationary ring assembly B is controlled by rotating the adjusting bolt, ensuring that each spring applies uniform pressure to the stationary ring assembly B, maintaining a balanced clamping force, and preventing leakage caused by misalignment of the moving and stationary rings. Simultaneously, threaded grooves are provided within the sealing strip to reduce the contact area between the sealing strip and the rotating shaft, lowering the adhesion of the sealing strip, thus facilitating movement when the moving and stationary rings are clamped, ensuring a tight seal. Attached Figure Description

[0020] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0021] Figure 2 This is the second structural schematic diagram of this utility model;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Figure 4 This is an exploded view of the present invention after the bolts and springs have been removed;

[0024] Figure 5 It is a 3D view of the sealing strip;

[0025] Figure 6 It is a 3D diagram of the moving ring.

[0026] In the diagram: 1. Mounting plate assembly; 11. Upper mounting plate; 12. Lower mounting plate; 2. Stationary ring assembly B; 21. Left half ring; 22. Middle ring; 23. Right half ring; 3. Spring seat assembly; 31. Left spring seat; 32. Middle spring seat; 33. Right spring seat; 4. Adjusting bolt; 5. Spring; 6. Stationary ring assembly A; 61. Upper half ring; 62. Lower half ring; 7. Moving ring assembly; 71. Sealing strip; 711. Arc protrusion; 712. Threaded groove; 72. Moving ring; 721. Insertion boss; 722. Arc groove; 723. Insertion slot. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments.

[0028] However, the description of this utility model is only a structural or even functional description of the embodiments, and the scope of the present utility model is not limited by the embodiments described herein.

[0029] For example, multiple embodiments may have various modifications and forms, and it should be understood that the scope of this utility model includes equivalents that can realize the technical concept.

[0030] like Figures 1-6 As shown, this embodiment is achieved through the following technical solution: It includes a mounting plate assembly 1, which is fixedly connected to the equipment base; the mounting plate assembly 1 has a through hole for the rotating shaft to pass through; a stationary ring assembly A6 is fixedly connected to one side of the mounting plate assembly 1, and a stationary ring assembly B2 is movably connected to the other side; a rotating ring assembly 7 is sandwiched between the stationary ring assembly A6 and the stationary ring assembly B2; the rotating ring assembly 7 is sealed to the rotating shaft and rotates with the rotating shaft; a spring seat assembly 3 is provided on one side of the stationary ring assembly B2, and several springs 5 ​​are evenly distributed on the spring seat assembly 3; the spring seat assembly 3 is elastically connected to the stationary ring assembly B2 through the springs 5; pressure is applied to the stationary ring assembly B2 by the springs 5, causing the stationary ring assembly B2, the rotating ring assembly 7, and the stationary ring assembly A6 to fit tightly together in sequence, thereby forming a seal between the stationary ring assembly B2 and the rotating ring assembly 7, and between the rotating ring assembly 7 and the stationary ring assembly A6;

[0031] The spring seat assembly 3 is provided with several adjusting bolts 4. The adjusting bolts 4 pass through the spring 5 and the stationary ring assembly B2 and are threadedly connected to the mounting plate assembly 1. When the adjusting bolts 4 are rotated, the distance between the spring seat assembly 3 and the stationary ring assembly B2 can be changed, thereby adjusting the compression of the spring 5 and controlling the pressure of the spring 5 on the stationary ring assembly B2.

[0032] In this embodiment, the moving ring assembly 7 includes a moving ring 72 and a sealing strip 71. There are two moving rings 72, and the sealing strip 71 is sandwiched between the two moving rings 72, forming a sealed connection. The sealing strip 71 has several evenly distributed arc-shaped protrusions 711 along its outer edge. The moving ring 72 has arc-shaped grooves 722 that fit the arc-shaped protrusions 711. The arc-shaped protrusions 711 are embedded in the arc-shaped grooves 722, serving to position and transmit torque.

[0033] The rotating ring 72 is also provided with a plug-in boss 721 and a plug-in groove 723. When the rotating ring assembly 7 is clamped by the stationary ring assembly A6 and the stationary ring assembly B2, the plug-in boss 721 on one side of the rotating ring of the sealing strip 71 is inserted into the plug-in groove 723 on the other side of the rotating ring, so that the two rotating rings help to lock each other, thereby reducing the load on the sealing strip 71. The inner ring of the sealing strip 71 is provided with a threaded groove 712. The threaded groove 712 is set according to the direction of rotation. The threaded groove 712 seals with the rotating shaft, while reducing the contact area between the sealing strip 71 and the rotating shaft, thus reducing the adhesion of the sealing strip 71.

[0034] The mounting plate assembly 1 includes an upper mounting plate 11 and a lower mounting plate 12, which are connected by bolts. The stationary ring assembly A6 includes an upper half-ring 61 and a lower half-ring 62, which are connected by bolts. The stationary ring assembly B2 includes a left half-ring 21, a middle ring 22, and a right half-ring 23, which are respectively fixed to both sides of the middle ring 22 by bolts. The spring seat assembly 3 includes a left spring seat 31, a middle spring seat 32, and a right spring seat 33, which are respectively fixed to both sides of the middle spring seat 32 by bolts. The mounting plate assembly 1, stationary ring assembly A6, stationary ring assembly B2, and spring seat assembly 3 are all of a split design to facilitate installation, disassembly, and maintenance.

[0035] The method of using this utility model is as follows:

[0036] 1. Install this utility model on the equipment base so that the rotating shaft passes through the moving ring 72;

[0037] 2. Use a torque wrench for calibration to determine the optimal torque range under non-leakage conditions;

[0038] 3. Use a torque wrench to tighten each adjusting bolt in three steps, in an X-shape. 4. The tightening torque for the first tightening is 50 N·m, the torque for the second tightening is 150 N·m, and the torque for the third tightening is 300 N·m, to ensure that the clamping force of each spring is appropriate.

[0039] 4. After tightening the adjusting bolt 4, select several positions at random and use a vernier caliper to measure the distance from the end face of the spring seat assembly 3 to the end face of the stationary ring assembly B2. Observe whether the distances at each point are equal. If the distances at each point are equal, it means that the spring seat assembly and the stationary ring assembly B2 are parallel, and the moving ring assembly 7, the stationary ring assembly B2, and the stationary ring assembly A6 are installed parallel and not crooked. If the distances at each point are not equal, it is necessary to continue to fine-tune the adjusting bolt 4 until the distances at each point are equal.

[0040] Of course, the above description is only a preferred embodiment of this utility model and should not be considered as limiting the scope of the embodiments of this utility model. This utility model is not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of this utility model should be included in the patent coverage of this utility model.

Claims

1. A novel nitrogen seal for a granulation unit, characterized in that, The device includes a mounting plate assembly (1), which is fixedly connected to the equipment base. The mounting plate assembly (1) has a through hole through which the rotating shaft passes. The mounting plate assembly (1) is fixedly connected to a stationary ring assembly A (6) on one side and movably connected to a stationary ring assembly B (2) on the other side. A rotating ring assembly (7) is sandwiched between the stationary ring assembly A (6) and the stationary ring assembly B (2). The rotating ring assembly (7) is sealed to the rotating shaft. A spring seat assembly (3) is provided on one side of the stationary ring assembly B (2). Several springs (5) are evenly distributed on the spring seat assembly (3). The spring seat assembly (3) is elastically connected to the stationary ring assembly B (2) through the springs (5). The spring seat assembly (3) is provided with several adjusting bolts (4). The adjusting bolts (4) pass through the spring (5) and the stationary ring assembly B (2) and are threadedly connected to the mounting plate assembly (1).

2. The nitrogen seal of the novel granulator unit according to claim 1, characterized in that, The moving ring assembly (7) includes a moving ring (72) and a sealing strip (71). There are two moving rings (72), and the sealing strip (71) is sandwiched between the two moving rings and is sealed to the two moving rings.

3. The nitrogen seal of the novel granulator unit according to claim 2, characterized in that, The sealing strip (71) has several arc protrusions (711) evenly distributed on its outer edge, and the moving ring (72) has an arc groove (722) that matches the arc protrusions (711). The arc protrusions (711) are embedded in the arc groove (722).

4. The nitrogen seal of the novel granulator unit according to claim 3, characterized in that, The moving ring (72) is provided with a plug-in boss (721) and a plug-in groove (723). When the moving ring assembly (7) is clamped by the stationary ring assembly A (6) and the stationary ring assembly B (2), the plug-in boss (721) on one side of the moving ring of the sealing strip (71) is embedded in the plug-in groove (723) on the other side of the moving ring.

5. The nitrogen seal of the novel granulator unit according to claim 4, characterized in that, The inner ring of the sealing strip (71) is provided with a threaded groove (712) for sealing and reducing adhesion.

6. The nitrogen seal of the novel granulator unit according to claim 1, characterized in that, The mounting plate assembly (1) includes an upper mounting plate (11) and a lower mounting plate (12), which are connected by bolts.

7. The nitrogen seal of the novel granulator unit according to claim 1, characterized in that, The stationary ring assembly A (6) includes an upper half ring (61) and a lower half ring (62), which are connected by bolts.

8. The nitrogen seal of the novel granulator unit according to claim 1, characterized in that, The stationary ring assembly B(2) includes a left half ring (21), a middle ring (22) and a right half ring (23), with the left half ring (21) and the right half ring (23) respectively fixed to both sides of the middle ring (22) by bolts.

9. The nitrogen seal of the novel granulator unit according to claim 1, characterized in that, The spring seat assembly (3) includes a left spring seat (31), a middle spring seat (32) and a right spring seat (33), with the left spring seat (31) and the right spring seat (33) respectively fixed to both sides of the middle spring seat (32) by bolts.

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