Shaft sealing sleeve special for cleaning melt pump

Abstract

The utility model discloses a special shaft sealing sleeve for cleaning a melt pump, which comprises a melt pump main body and a shaft sealing sleeve component arranged on the melt pump, the shaft sealing sleeve component comprises a shaft sealing sleeve sleeved at the top end of a pump shaft and a gland flange arranged at the front end of the shaft sealing sleeve, after the shaft sealing sleeve is arranged at the top end of the pump shaft in a sleeving mode, the gland flange is attached to the top of the packing cylinder and fixed to the packing cylinder through a screw, a closed space is formed among the shaft sealing sleeve, the outer wall of the pump shaft and a packing box channel in the packing cylinder, and the closed space is formed by the outside of the pump shaft and the inside of the packing cylinder. And the solvent in the filler cylinder cannot leak from the joint of the filler cylinder and the pump shaft, so that the solvent cannot leak when the melt pump is cleaned, and the safety of the melt pump during cleaning is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of melt pump cleaning, in particular to a special shaft sealing sleeve for melt pump cleaning. Background Art

[0002] Melt pumps are mainly used for conveying, pressurizing and metering high-temperature and high-viscosity polymer melts, such as extrusion molding of plastics, resins, rubbers and chemical fiber products. They are widely used in industries such as granulation, films, pipes, plates, sheets, man-made fibers, optical fibers and medical plastic catheters. The melt pump shaft seal usually uses a packing seal to seal the melt shaft. The packing seal device usually consists of a stuffing box, a soft packing and a packing gland. The soft packing is an asbestos rope soaked in oil or coated with graphite or a high-temperature resistant carbon fiber. It is placed between the stuffing box and the pump shaft, and the gland is pressed to deform it to achieve sealing. Since the melt pump shaft seal uses a packing seal and the pumped medium is mainly a high-temperature and high-viscosity polymer, the purpose of preventing the medium from leaking from the shaft seal during operation is achieved;

[0003] When the melt shaft needs to be cleaned, the corresponding solvent is usually used. On the production line, it is cleaned by solvent circulation or solvent immersion. Since most solvents have strong dissolving power and penetration, or are toxic, harmful, flammable and explosive liquids, there is a possibility of solvent leakage at the shaft seal of the packing seal on the melt pump when cleaning the melt pump with solvent, which poses a major safety hazard.

[0004] Therefore, the utility model provides a special shaft seal sleeve for cleaning a melt pump, which can prevent solvent from leaking from the shaft seal. Utility Model Content

[0005] The utility model aims to provide a special shaft seal sleeve for cleaning a melt pump, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A special shaft seal sleeve for cleaning a melt pump, comprising a melt pump body and a shaft seal sleeve assembly arranged on the melt pump, wherein the melt pump body comprises a packing cylinder, a plurality of packing rings arranged in the packing cylinder, a pump shaft arranged in the packing cylinder and coaxially arranged in the packing rings, and the top end of the pump shaft extends out of the top end of the packing cylinder;

[0008] The shaft seal sleeve assembly includes a shaft seal tube sleeved on the top of the pump shaft, and a gland flange arranged at the front end of the shaft seal tube. After the shaft seal tube is sleeved on the top of the pump shaft, the gland flange is attached to the top of the packing tube and fixed to the packing tube by screws.

[0009] A closed space is formed between the shaft sealing tube, the outer wall of the pump shaft and the stuffing passage in the stuffing cylinder.

[0010] Furthermore, the inner wall of the shaft sealing tube does not contact and protect the outer wall of the pump shaft and the length of the shaft sealing tube extends beyond the top end of the pump shaft. The shaft sealing tube is sleeved on the outside of the pump shaft and the diameter and length of the shaft sealing tube are larger than the pump shaft, thereby achieving the purpose of sealing and protecting the shaft sealing tube on the outside of the pump shaft without affecting the operation of the pump shaft.

[0011] Furthermore, the shaft sealing tube and the gland flange are welded as one body, and the diameter of the shaft sealing tube is consistent with the diameter of the stuffing cylinder. The shaft sealing tube and the gland flange are welded as one body, which improves the sealing performance of the connection between the shaft sealing tube and the stuffing cylinder.

[0012] Furthermore, a sealing gasket is provided between the gland flange and the packing cylinder, and the sealing gasket is used to cooperate and seal the gland flange and the packing cylinder. The sealing gasket is located on the side where the packing cylinder and the gland flange are connected. When the gland flange is screwed and fixed to the screw holes on the packing cylinder by screws, the gland flange gasket is pressed tightly between the gland flange and the packing cylinder to maintain the sealing between the shaft seal tube and the packing cylinder.

[0013] Furthermore, the gland flange and the shaft seal tube are respectively made of 304 stainless steel structure, and the top of the shaft seal tube is provided with a 304 stainless steel disc sealed and fixed to the top of the shaft seal tube. The gland flange and the shaft seal tube of the 304 stainless steel structure are prevented from rusting during use with the melt pump, which may affect the use of the melt pump.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The shaft seal sleeve is specially used for cleaning the melt pump. The shaft seal sleeve assembly is mounted on the outside of the top end of the pump shaft on the stuffing barrel, so as to form a closed space between the outside of the pump shaft and the inside of the stuffing barrel. When the melt pump is cleaned, the solvent in the stuffing barrel will not leak from the connection between the stuffing barrel and the pump shaft, ensuring that the solvent will not leak when cleaning the melt pump and maintaining the safety of the melt pump during cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 For this utility model Figure 1 Schematic diagram of the main cross-sectional structure;

[0018] Figure 3 It is a structural schematic diagram of the shaft sealing sleeve of the utility model.

[0019] In the figure: 1. Melt pump body; 2. Shaft seal sleeve assembly; 3. Stuffing cylinder; 4. Stuffing ring; 5. Pump shaft; 6. Shaft seal pipe; 7. Gland flange; 8. Screws; 9. Enclosed space; 10. Sealing gasket; 11. 304 stainless steel disc. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3 , the utility model provides a technical solution:

[0022] A special shaft seal sleeve for cleaning a melt pump comprises a melt pump body 1 and a shaft seal sleeve assembly 2 arranged on the melt pump, wherein the melt pump body 1 comprises a stuffing barrel 3, a plurality of stuffing rings 4 arranged in the stuffing barrel 3, a pump shaft 5 arranged in the stuffing barrel 3 and coaxially arranged in the stuffing ring 4, and the top end of the pump shaft 5 extends out of the top end of the stuffing barrel 3;

[0023] The shaft seal sleeve assembly 2 includes a shaft seal tube 6 sleeved on the top of the pump shaft 5, and a gland flange 7 arranged at the front end of the shaft seal tube 6. After the shaft seal tube 6 is sleeved on the top of the pump shaft 5, the gland flange 7 is attached to the top of the packing tube 3 and fixed to the packing tube 3 by screws 8. The inner diameter of the shaft seal tube 6 is equal to or greater than the inner diameter of the gland flange 7, and the length is slightly longer than the length of the pump shaft 5 extending out of the packing tube 3.

[0024] A closed space 9 is formed between the shaft seal tube 6 , the outer wall of the pump shaft 5 , and the stuffing passage in the stuffing tube 3 .

[0025] The inner wall of the shaft sealing tube 6 does not contact and protect the outer wall of the pump shaft 5, and the length of the shaft sealing tube 6 extends beyond the top end of the pump shaft 5. The shaft sealing tube 6 is sleeved on the outside of the pump shaft 5, and the diameter and length of the shaft sealing tube 6 are larger than the pump shaft 5, so as to achieve the purpose of sealing and protecting the shaft sealing tube 6 on the outside of the pump shaft 5 without affecting the operation of the pump shaft 5.

[0026] The shaft seal tube 6 and the gland flange 7 are welded as one body, and the diameter of the shaft seal tube 6 is consistent with the diameter of the stuffing tube 3 . The shaft seal tube 6 and the gland flange 7 are welded as one body, which improves the sealing performance of the connection between the shaft seal tube 6 and the stuffing tube 3 .

[0027] A sealing gasket 10 is provided between the gland flange 7 and the packing cylinder 3, and the sealing gasket 10 is used to seal the gland flange 7 and the packing cylinder 3. The sealing gasket 10 is located on the side where the packing cylinder 3 and the gland flange 7 are connected. When the gland flange 7 is screwed and fixed with the screw holes on the packing cylinder 3 by screws 8, the gland flange 7 gasket is pressed tightly between the gland flange 7 and the packing cylinder 3 to maintain the sealing between the shaft seal tube 6 and the packing cylinder 3.

[0028] The gland flange 7 and the shaft seal tube 6 are respectively made of 304 stainless steel structures, and the top of the shaft seal tube 6 is provided with a 304 stainless steel disc 11 which is sealed and fixed to the top of the shaft seal tube 6. The diameter of the 304 stainless steel disc 11 is equal to the inner diameter of the 304 stainless steel tube. The outer diameter, the hole diameter, the hole spacing and the number of holes of the gland flange 7 are equal to the outer diameter of the stuffing tube 3, the hole diameter, the hole spacing and the number of holes of the screw 8. The inner diameter is 1 mm larger than the shaft diameter. The gland flange 7 and the shaft seal tube 6 of the 304 stainless steel structure are prevented from rusting during use with the melt pump, which may affect the use of the melt pump.

[0029] The shaft seal sleeve 2 is specially used for cleaning the melt pump. The size of the shaft seal sleeve assembly 2 varies according to the size of the stuffing tube 3 on different melt pumps. The shaft seal sleeve assembly 2 is sleeved on the outside of the top end of the pump shaft 5 on the stuffing tube 3 to form a closed space 9 between the outside of the pump shaft 5 and the inside of the stuffing tube 3. When the melt pump is cleaned, the solvent in the stuffing tube 3 will not leak from the connection between the stuffing tube 3 and the pump shaft 5, ensuring that the solvent will not leak when cleaning the melt pump and maintaining the safety of the melt pump when cleaning;

[0030] When assembling the shaft sealing sleeve assembly 2 and the stuffing cylinder 3, the shaft sealing tube 6 on the shaft sealing sleeve is fitted with the pump shaft 5 on the stuffing cylinder 3, and the gland flange 7 at the front end of the shaft sealing sleeve is fitted with the gasket at the top end of the stuffing cylinder 3. The operator uses screws 8 to penetrate the gland flange 7, the gasket and the screw holes at the top end of the stuffing cylinder 3, and tightly fixes the gland flange 7 and the stuffing cylinder 3 as a whole, so that the inside of the shaft sealing tube 6 and the inside of the stuffing cylinder 3 form a closed space 9, so that when the inside of the melt pump is cleaned with solvent, the solvent will not leak from the connection between the pump shaft 5 and the stuffing cylinder 3, thereby improving the sealing performance and safety of the melt pump during cleaning.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shaft seal sleeve for cleaning a melt pump, comprising a melt pump body (1) and a shaft seal sleeve assembly (2) arranged on the melt pump, characterized in that: The melt pump body (1) comprises a packing cylinder (3), a plurality of packing rings (4) arranged in the packing cylinder (3), and a pump shaft (5) arranged in the packing cylinder (3) and coaxially arranged in the packing rings (4), wherein the top end of the pump shaft (5) extends out of the top end of the packing cylinder (3); The shaft seal sleeve assembly (2) comprises a shaft seal tube (6) sleeved on the top end of the pump shaft (5), and a gland flange (7) arranged at the front end of the shaft seal tube (6); after the shaft seal tube (6) is sleeved on the top end of the pump shaft (5), the gland flange (7) is attached to the top of the packing tube (3) and is fixed to the packing tube (3) by means of screws (8); A closed space (9) is formed between the shaft seal tube (6), the outer wall of the pump shaft (5), and the stuffing channel in the stuffing cylinder (3).

2. The special shaft seal sleeve for melt pump cleaning according to claim 1, characterized in that: The inner wall of the shaft sealing tube (6) is not in contact with the outer wall of the pump shaft (5) for protection, and the length of the shaft sealing tube (6) extends beyond the top end of the pump shaft (5).

3. A special shaft seal sleeve for melt pump cleaning according to claim 2, characterized in that: The shaft sealing tube (6) and the gland flange (7) are welded together as one body, and the diameter of the shaft sealing tube (6) is consistent with the diameter of the stuffing cylinder (3).

4. The special shaft seal sleeve for melt pump cleaning according to claim 1, characterized in that: A sealing gasket (10) is provided between the gland flange (7) and the stuffing tube (3), and the gland flange (7) and the stuffing tube (3) are sealed by the sealing gasket (10).

5. The special shaft seal sleeve for melt pump cleaning according to claim 1, characterized in that: The gland flange (7) and the shaft seal tube (6) are respectively made of 304 stainless steel structures, and the top end of the shaft seal tube (6) is provided with a 304 stainless steel disc (11) which is sealed and fixed to the top end of the shaft seal tube (6).

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