Novel split type shaft seal device of paddle type drying machine

Abstract

The utility model discloses a novel split type shaft seal device of a paddle type drying machine, which belongs to the field of drying equipment and comprises a stirring shaft, an upper shaft seal seat, a lower shaft seal seat, a packing layer, an air seal ring, a sealing layer, a sealing spring and a packing gland. An upper shaft seal seat and a lower shaft seal seat are arranged on the stirring shaft; a sealing layer is arranged on the outer wall of the stirring shaft, the outer wall of the sealing layer is in contact with one end of a sealing pressure spring, and the other end of the sealing pressure spring is attached to the inner wall of the upper shaft seal seat or the lower shaft seal seat; a packing layer is arranged on the outer wall of the stirring shaft, and packing glands are arranged outside the upper shaft seal seat and the lower shaft seal seat and arranged outside the packing layer. According to the utility model, the maintenance intensity can be greatly reduced, the maintenance time is reduced, and the equipment operation rate is improved. And meanwhile, the possibility of entering a front end shaft seal gap is reduced, the equipment operation rate is improved, and the operation efficiency of the whole production device is ensured.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment, specifically a novel split shaft sealing device for a paddle dryer. Background Technology

[0002] Currently, many of the drying equipment used in chemical projects is the new type of paddle dryer. Its feed end is often designed with a stuffing box structure, using a pressurized packing to reduce the chance of material entering the shaft seal through the gap between the end plate and the main shaft. However, in actual production, the packing is generally loose during startup and gradually tightens after a period of operation. But because the new paddle dryer is relatively large, tightening the packing during operation poses a significant safety risk.

[0003] During long-term operation, the constant friction between the shaft seal and the shaft in the dryer results in a larger gap at the shaft seal. This allows material to easily get trapped in the gap and become difficult to remove. Prolonged high-temperature drying causes the surface of this unremoved material to gradually turn yellow or carbonize into black. As the main shaft rotates, this material, if squeezed out of the shaft seal gap and mixed into the finished product, will cause yellow spots to appear. If this material enters downstream processes, it will severely affect product quality. Furthermore, each maintenance and replacement, especially the internal packing and hard ring replacement, requires the removal of the main shaft bearing, resulting in a significant workload. Utility Model Content

[0004] To address the aforementioned problems, this invention presents a novel split-type shaft seal device for a paddle dryer. This device effectively prevents polyvinyl alcohol material from entering the shaft seal, reducing the likelihood of yellow spots, while also minimizing maintenance intensity and time, and improving equipment uptime.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A novel split-type shaft sealing device for a paddle dryer includes a stirring shaft, an upper shaft seal seat, a lower shaft seal seat, a packing layer, an air seal ring, a sealing layer, a sealing spring, and a packing gland. The stirring shaft is provided with an upper shaft seal seat and a lower shaft seal seat. A sealing layer is provided on the outer wall of the stirring shaft, with one end of the sealing layer contacting the outer wall of the sealing spring and the other end of the sealing spring fitting against the inner wall of the upper or lower shaft seal seat. A packing layer is provided on the outer wall of the stirring shaft, and a packing gland is provided outside the upper and lower shaft seal seats, with the packing gland positioned outside the packing layer.

[0007] As a further embodiment of this utility model, the sealing compression spring is provided in multiple sets.

[0008] As a further embodiment of this invention, the filler layer is disposed around the sealing layer and the sealing spring.

[0009] As a further embodiment of this utility model: both the upper shaft seal and the lower shaft seal are semi-circular, and the upper shaft seal and the lower shaft seal are combined to form a circle.

[0010] As a further embodiment of this utility model: the combination of the upper shaft seal and the lower shaft seal is fitted and disposed on the outside of the stirring shaft.

[0011] As a further embodiment of this utility model: the upper shaft seal and the lower shaft seal are fixedly mounted on the dryer sealing cover.

[0012] As a further embodiment of this utility model, the upper shaft seal, the lower shaft seal, and the packing gland are directly fixedly connected by bolts.

[0013] As a further embodiment of this invention, the sealing layer is a segmented polytetrafluoroethylene hard seal.

[0014] As a further embodiment of this utility model, the filler layer is oil-impregnated polytetrafluoroethylene filler.

[0015] As a further embodiment of this utility model: the stirring shaft is provided with anti-spiral blades, the stirring shaft passes through the dryer sealing cover, and the anti-spiral blades and the upper and lower shaft seals are respectively mounted on both sides of the dryer sealing cover.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This utility model's shaft sealing device, based on the original paddle dryer's feed end packing shaft seal, modifies the feed shaft seal seat with a split structure. By adding a split hard seal to the original packing packing, and applying spring pressure, it further reduces wear on the hard seal caused by material, thus reducing friction in the shaft journal clearance and preventing yellowing of the material. Furthermore, replacing the split seal eliminates the need to remove the motor reducer and main shaft bearing at the main shaft end, significantly reducing workload, saving maintenance time, and improving equipment uptime. The device utilizes two sealing methods: an inner spring-pressed split PTFE hard seal and an outer packing gland-pressed oil-impregnated PTFE packing, ensuring that material cannot enter the main shaft seal position. Moreover, the split structure eliminates the need to remove the front-end motor reducer and main shaft bearing when replacing the seal, greatly reducing maintenance intensity and time, and improving equipment uptime. It also reduces the possibility of material entering the front shaft seal clearance, effectively solving the problem of yellowing and other defective products. At the same time, maintenance time is greatly reduced, especially for maintenance involving the removal of the main shaft bearing, which reduces maintenance time by half, improves equipment operating rate, and ensures the operating efficiency of the entire production unit. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a novel split shaft sealing device for a paddle dryer.

[0019] Figure 2 This is a detailed enlarged view of a novel split shaft sealing device for a paddle dryer.

[0020] Figure 3 This is a side view of a novel split shaft sealing device for a paddle dryer.

[0021] In the diagram: 1. Upper shaft seal; 2. Lower shaft seal; 3. Packing layer; 4. Air seal ring; 5. Sealing layer; 6. Sealing compression spring; 7. Packing gland; 8. Reverse spiral blade; 9. Agitator shaft. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] This utility model relates to a novel split shaft seal device for a paddle dryer. Its purpose is to reduce the yellow spots caused by friction between the material and the shaft seal at the feed end of the existing paddle dryer, while reducing maintenance intensity, reducing maintenance time, and improving equipment operating rate.

[0025] Please see Figure 1-3 A novel split shaft sealing device for a paddle dryer includes a stirring shaft 9, an upper shaft seal seat 1, a lower shaft seal seat 2, a packing layer 3, an air seal ring 4, a sealing layer 5, a sealing spring 6, and a packing gland 7.

[0026] The stirring shaft 9 is equipped with an upper shaft seal 1 and a lower shaft seal 2;

[0027] A sealing layer 5 is provided on the outer wall of the stirring shaft 9. The outer wall of the sealing layer 5 is in contact with one end of the sealing compression spring 6, and the other end of the sealing compression spring 6 is in contact with the inner wall of the upper shaft seal 1 or the lower shaft seal 2.

[0028] Multiple sets of sealing compression springs 6 are provided. These multiple sets of sealing compression springs 6 ensure the tight fit of the sealing layer 5, guarantee the shaft sealing effect of the stirring shaft 9, increase the sealing effect, ensure safety, and facilitate the use of the device.

[0029] The outer wall of the stirring shaft 9 is provided with a packing layer 3, which is located around the sealing layer 5 and the sealing spring 6. There are three sets of packing layers 3 to ensure the shaft sealing effect of the stirring shaft 9, increase the sealing effect, ensure safety, and facilitate the use of the device.

[0030] The upper shaft seal 1 and the lower shaft seal 2 are provided with a packing gland 7 on the outside. The packing gland 7 tightly compresses the packing layer 3 to ensure the shaft seal effect and increase safety.

[0031] Both the upper shaft seal 1 and the lower shaft seal 2 are semi-circular. The upper shaft seal 1 and the lower shaft seal 2 are combined to form a circle. The upper shaft seal 1 and the lower shaft seal 2 are fitted to the outside of the stirring shaft 9. The upper shaft seal 1 and the lower shaft seal 2 ensure the sealing effect, ensure safety, and facilitate the use of the device.

[0032] The upper shaft seal 1 and the lower shaft seal 2 are fixedly installed on the dryer sealing cover, which helps to ensure the stability of the stirring shaft 9 and increases safety.

[0033] The upper shaft seal 1 and the lower shaft seal 2 are directly fixed to the packing gland 7 by bolts, ensuring the stability of the connection and increasing safety.

[0034] The sealing layer 5 is a segmented polytetrafluoroethylene hard seal; at the same time, the hard seal is fixed to the main shaft by a compression spring, and the sealing effect is ensured by compression layer by layer.

[0035] Packing layer 3 is made of oil-impregnated polytetrafluoroethylene packing to ensure the sealing effect of the agitator shaft.

[0036] The stirring shaft 9 is spirally provided with anti-spiral blades 8. The stirring shaft 9 passes through the dryer sealing cover. The anti-spiral blades 8 and the upper shaft seal 1 and lower shaft seal 2 are respectively mounted on both sides of the dryer sealing cover. The upper shaft seal 1 and lower shaft seal 2 ensure the sealing effect, ensure safety, and facilitate the use of the device.

[0037] This utility model is a novel split shaft seal device for a paddle dryer. The original stuffing box is removed and modified into a split shaft seal seat. A segmented polytetrafluoroethylene (PTFE) hard seal is installed on the inner cavity of the shaft seal seat. The hard seal is fixed to the main shaft by a compression spring. The hard seal is pressed and fixed in the inner cavity of the shaft seal seat by compression. Three layers of oil-impregnated PTFE packing 3 are installed on the outside of the shaft seal seat. The packing is pressed by a packing gland to make the oil-impregnated PTFE packing in close contact with the surface of the main shaft.

[0038] This utility model's shaft sealing device, based on the original paddle dryer's feed end packing shaft seal, modifies the feed shaft seal seat by adopting a split structure. By adding a split hard seal to the original packing packing and applying spring pressure, it further reduces wear on the hard seal caused by material, thus reducing friction between the material and the shaft journal, preventing yellow material discharge. Furthermore, replacing the split seal no longer requires removing the motor reducer and main shaft bearing at the main shaft end, significantly reducing workload, saving maintenance time, and improving equipment operating rate.

[0039] The structural features of the feed end shaft seal device of this utility model paddle dryer are as follows: it ensures that materials cannot enter the main shaft seal position by means of two sealing methods: a split-type polytetrafluoroethylene hard seal pressed by an inner spring and an oil-impregnated polytetrafluoroethylene packing pressed by an outer packing gland. At the same time, when replacing the shaft seal, the split structure does not require the removal of the front motor reducer and the main shaft bearing, which can greatly reduce the maintenance intensity, reduce maintenance time, and improve the equipment operating rate.

[0040] Compared with existing anti-spiral blade shaft sealing devices, the effects of this invention are very significant: through the above modifications, the probability of polyvinyl alcohol material entering the anti-spiral cavity is reduced, as is the possibility of it entering the front shaft seal gap, effectively solving the problem of unqualified products such as yellow spot material. At the same time, maintenance time is greatly reduced, especially for maintenance involving the removal of the main shaft bearing, where maintenance time is halved, improving equipment operating rate and ensuring the overall operating efficiency of the production unit.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects; the scope of this invention is defined by the appended claims rather than the foregoing description; and thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution; this narrative style is merely for clarity; those skilled in the art should consider the specification as a whole; the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel split-type shaft sealing device for a paddle dryer, characterized in that, It includes a stirring shaft (9), an upper shaft seal (1), a lower shaft seal (2), a packing layer (3), an air seal ring (4), a sealing layer (5), a sealing compression spring (6), and a packing gland (7); the stirring shaft (9) is provided with an upper shaft seal (1) and a lower shaft seal (2); the outer wall of the stirring shaft (9) is provided with a sealing layer (5), the outer wall of the sealing layer (5) is in contact with one end of the sealing compression spring (6), and the other end of the sealing compression spring (6) is in contact with the inner wall of the upper shaft seal (1) or the lower shaft seal (2); the outer wall of the stirring shaft (9) is provided with a packing layer (3), and the upper shaft seal (1) and the lower shaft seal (2) are provided with a packing gland (7), which is located outside the packing layer (3).

2. A novel split-type shaft sealing device for a paddle dryer according to claim 1, characterized in that, The sealing compression spring (6) is provided in multiple sets.

3. A novel split-type shaft sealing device for a paddle dryer according to claim 2, characterized in that, The filler layer (3) is disposed around the sealing layer (5) and the sealing compression spring (6).

4. A novel split-type shaft sealing device for a paddle dryer according to claim 3, characterized in that, The upper shaft seal (1) and the lower shaft seal (2) are both semi-circular, and the upper shaft seal (1) and the lower shaft seal (2) are combined to form a circle.

5. A novel split-type shaft sealing device for a paddle dryer according to claim 4, characterized in that, The upper shaft seal (1) and the lower shaft seal (2) are fitted together on the outside of the stirring shaft (9).

6. A novel split-type shaft sealing device for a paddle dryer according to claim 5, characterized in that, The upper shaft seal (1) and the lower shaft seal (2) are fixedly installed on the dryer sealing cover.

7. A novel split-type shaft sealing device for a paddle dryer according to claim 6, characterized in that, The upper shaft seal (1), lower shaft seal (2) and packing gland (7) are directly fixedly connected by bolts.

8. A novel split-type shaft sealing device for a paddle dryer according to claim 7, characterized in that, The sealing layer (5) is a segmented polytetrafluoroethylene hard seal.

9. A novel split-type shaft sealing device for a paddle dryer according to claim 8, characterized in that, The filler layer (3) is an oil-impregnated polytetrafluoroethylene filler.

10. A novel split-type shaft sealing device for a paddle dryer according to claim 9, characterized in that, The stirring shaft (9) is provided with anti-spiral blades (8), and the stirring shaft (9) passes through the dryer sealing cover. The anti-spiral blades (8), the upper shaft seal (1), and the lower shaft seal (2) are respectively mounted on both sides of the dryer sealing cover.

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