CN105805314A - A slag pulp line pressure screen machine seal - Google Patents

Abstract

The invention provides a slag pulp line pressure screen machine seal comprising a pressure screen shell, a bearing body fixed to the shell and used for supporting a rotating shaft, the pressure screen rotating shaft penetrating the bearing body, a sealing portion fixed in the pressure screen shell to isolate pulp liquid and the bearing body and a metal thread mechanical seal. The slag pulp line pressure screen machine seal is characterized in that the sealing portion comprises a sealing disc cover, a sealing disc body and a sealing shield body which are fixedly connected from top to bottom; the sealing shield body is fixedly installed in the pressure screen shell; an installing surface between the sealing disc cover and the sealing disc body is inside provided with a disc cover sealing ring; an installing surface between the sealing disc body and the sealing shield body is inside provided with a disc body sealing ring; an installing surface between the sealing shield body and the pressure screen shell is inside provided with a shield body sealing ring. Rubber sealing rings are adopted at static seal positions and the metal thread mechanical seal is adopted at a dynamic seal position; the sealing performance is reliable, water leakage is thoroughly prevented, the service life is long and wear is prevented; water is prevented from entering the bearing body, the service life of a pressure screen is prolonged, the production cost is reduced and the product benefit is increased.

Description

Slurry line pressure screen machine seal

technical field

The invention relates to the field of papermaking machinery, in particular to a mechanical sealing device for a pressure screen of a slurry line.

Background technique

The slurry line pressure screen is one of the indispensable equipments in the paper industry, which can screen out various impurities, such as pulp lumps, stickies, hot melts, debris, etc. In the production workshop, the sealing condition of the pressure screen machine is relatively bad. At present, the sealing device of most pressure screen machines is relatively simple, the sealing effect is not good, and it is not suitable for long-term production work. The gap between the sealing surface will easily lead to water leakage and slurry leakage. Equipment Repairs are too fast and costly.

The patent number is: 201320840699.3 "Pressure Screen Shaft Sealing Device". Its structure includes a shaft sleeve, a labyrinth device, a labyrinth cover, a labyrinth seat, a spring, a skeleton oil seal and a skeleton oil seal seat. On the screen shaft, the labyrinth device is installed on the upper part of the labyrinth seat and the lower part of the gasket, the upper cover of the labyrinth is installed and fixed on the original mechanical seal seat, the labyrinth seat is installed on the original mechanical seal block through a spring, and the skeleton oil seal Installed in the skeleton oil seal seat; further, the shaft sleeve and the pressure screen shaft cooperate with each other, and the spring is installed between the labyrinth seat and the original mechanical seal block; further, the skeleton oil seal is at least two, A circlip is arranged at the bottom of the skeleton oil seal, and is installed and fixed in the skeleton oil seal seat. This device simply uses a labyrinth device and increases the number of skeleton oil seals to improve the sealing performance, but only slightly prolongs the sealing time, and cannot fundamentally solve the problem that the seals are easy to wear and cause leakage.

Contents of the invention

The invention discloses a machine seal for a slurry line pressure screen, which solves the problem of slurry leakage caused by easy wear of the seal and prolongs the service life of the equipment.

In order to achieve the above-mentioned purpose, the present invention adopts following concrete technical scheme:

Slag slurry line pressure screen mechanical seal, including pressure screen shell, bearing body fixed to the shell and used to support the rotating shaft, pressure screen rotating shaft passing through the bearing body, fixed in the pressure screen shell to isolate the slurry from the bearing body The sealing part also includes a metal thread mechanical seal. The metal thread mechanical seal includes a rotating part and a fixed part. The rotating part is fixedly connected with the pressure screen rotating shaft, and the fixed part is fixedly connected with the sealing part. A sealing disc cover, a sealing disc body and a sealing cover are fixedly connected in sequence from top to bottom, the sealing cover is fixedly installed in the pressure screen shell, and a disc Cover sealing ring, a disc sealing ring is provided on the installation surface between the sealing disk body and the sealing cover body, a cover body sealing ring is provided on the installation surface between the sealing cover body and the pressure screen shell, the sealing The disk cover is provided with a through hole for the rotating shaft, and the diameter of the through hole of the rotating shaft is not smaller than the shaft diameter of the corresponding position of the rotating shaft of the pressure screen. The lower end of the central through hole is an oil seal hole section, and a skeleton oil seal is arranged inside the oil seal hole section.

Further, a water hole is provided in the sealing disk body, the water outlet end of the water hole faces the inner space formed by the sealing disk cover and the sealing disk body, the water inlet end of the water hole seals the cylindrical surface of the lower part of the disk body, The water inlet end of the water hole is connected with a quick intubation joint, and the water pipe is connected to the quick intubation joint to form a pressure in the internal space formed by the sealing disc cover and the sealing disc body to prevent the slurry from flowing into the closed space.

Further, the difference between the through hole diameter of the rotating shaft and the corresponding position of the rotating shaft of the pressure screen is 0-4mm.

As an optimization, the diameter of the through hole of the rotating shaft is equal to the shaft diameter of the rotating shaft of the pressure screen corresponding to it, and the two adopt clearance fit.

Compared with the prior art, the present invention has the advantages that: the contact surface between the rotating part and the fixed part of the metal thread mechanical seal is a hard alloy surface, and the contact surface has no gap, which can prevent leakage and is extremely wear-resistant; the setting of the water hole can The pressure is formed in the internal space formed by the sealing disc cover and the sealing disc body, which prevents the slurry from flowing into the closed space, and plays a cleaning role on the metal thread mechanical seal. The particle-free environment can further improve the wear resistance of the metal thread mechanical seal and prolong the service life of the equipment. life.

Description of drawings

Fig. 1 is an assembly schematic diagram of the present invention;

Fig. 2 is a schematic diagram of assembly of the sealing part of the present invention;

Fig. 3 is a top view of the sealing part of the present invention;

The present invention will be further described in detail below in conjunction with the accompanying drawings.

detailed description

In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific examples.

Example 1:

As shown in Figures 1 to 3, the mechanical seal of the slurry line pressure screen includes a pressure screen shell 3, a bearing body 2 fixed to the shell and used to support the rotating shaft, a pressure screen rotating shaft 1 passing through the bearing body, and fixed on the pressure screen. The sealing part 4 that isolates the slurry from the bearing body in the screen housing also includes a metal thread mechanical seal 5. The metal thread mechanical seal includes a rotating part 52 and a fixed part 51. The rotating part is fixedly connected with the pressure screen shaft and fixed. The sealing part is fixedly connected with the sealing part, and the sealing part 4 is fixedly connected with the sealing disc cover 41, the sealing disc body 42 and the sealing cover body 43 in order from top to bottom, and the sealing cover body 43 is fixedly installed in the pressure screen housing 3 , the mounting surface between the sealing disk cover 41 and the sealing disk body 42 is provided with a disk cover sealing ring 44, and the mounting surface between the sealing disk body 42 and the sealing cover body 43 is provided with a disk body sealing ring 45, so A cover sealing ring 48 is provided on the installation surface between the sealing cover 43 and the pressure screen housing 3, and the sealing disc cover 41 is provided with a shaft through hole 411, and the diameter of the shaft through hole 411 is not smaller than the pressure screen shaft 1 The shaft diameter at the corresponding position preferably has a difference range of 0 to 4 mm. The sealing disc body 42 is provided with a central through hole 422, and the upper end of the central through hole 422 is a fixed hole section 4221. The fixed part 51 and the fixed hole section 4221 are seamlessly connected, and the lower end of the central through hole 422 is an oil seal hole section 4222, and a skeleton oil seal 49 is fixedly installed in the oil seal hole section 4222 with a circlip 50.

Example 2:

On the basis of Embodiment 1, a water hole 421 is provided in the sealing disc body 42, and the water outlet end of the water hole 421 faces the inner space formed by the sealing disc cover 41 and the sealing disc body 42, and the water hole 421 On the cylindrical surface of the lower part of the water inlet end sealing disc body 42, the water inlet end of the water hole 421 is connected with a quick intubation pipe joint 46, and the water pipe 47 is connected to the quick intubation pipe joint 46 to connect the sealing disc cover and the sealing disc body The formed internal space creates pressure, which prevents the slurry 6 from flowing into the closed space.

Example 3:

On the basis of Example 1, the diameter of the through hole 411 of the rotating shaft is equal to the shaft diameter of the pressure screen rotating shaft 1 corresponding to it, and the two adopt a clearance fit to prevent the large particles in the slurry 6 from entering the sealing disc cover and sealing The inner space formed by the disc body prevents the metal thread mechanical seal from being worn by particles and reduces the service life.

The above records are only examples of using the technical content of this creation. Any modifications and changes made by those who are familiar with this technology using this creation belong to the scope of patents claimed by this creation, and are not limited to those disclosed in the examples.

Claims (4)

1. The mechanical seal of the slurry line pressure screen, including the pressure screen shell (3), the bearing body (2) fixed on the shell and used to support the rotating shaft, the pressure screen rotating shaft (1) passing through the bearing body, fixed on the pressure screen The sealing part (4) in the screen housing that isolates the slurry from the bearing body also includes a metal thread mechanical seal (5). The metal thread mechanical seal includes a rotating part (52) and a fixed part (51). The rotating part It is fixedly connected with the rotating shaft of the pressure screen, and the fixed part is fixedly connected with the sealing part. It is characterized in that: the sealing part is fixedly connected with a sealing disc cover (41), a sealing disc body (42) and a sealing cover body (43) from top to bottom in sequence. ), the sealing cover (43) is fixedly installed in the pressure screen housing (3), and the sealing ring (44 ), the mounting surface between the sealing disc (42) and the sealing cover (43) is provided with a disc sealing ring (45), and the sealing ring (45) between the sealing cover (43) and the pressure screen housing (3) The cover sealing ring (48) is arranged on the installation surface, and the sealing disc cover (41) is provided with a shaft through hole (411), and the diameter of the shaft through hole (411) is not smaller than that of the pressure screen shaft (1) corresponding to it The shaft diameter of the position, the sealing disc body (42) is provided with a central through hole (422), the upper end of the central through hole (422) is a fixed hole section (4221), the fixed part (51) and the fixed hole section (4221 ) are seamlessly connected, the lower end of the central through hole (422) is an oil seal hole section (4222), and a skeleton oil seal (49) is arranged inside the oil seal hole section (4222). 2. The mechanical seal of the slurry line pressure screen according to claim 1, characterized in that: the sealing disc body (42) is provided with a water hole (421), and the water outlet end of the water hole (421) faces the seal The inner space formed by the disc cover (41) and the sealing disc body (42), the water inlet end of the water hole (421) seals the cylindrical surface of the lower part of the disc body (42), and the water inlet of the water hole (421) The end is connected with a quick intubation connector (46), and the water pipe (47) is connected to the quick intubation connector (46). 3. The mechanical seal of the slurry line pressure screen according to any one of claims 1 or 2, characterized in that: the difference between the diameter of the through hole (411) of the rotating shaft and the shaft diameter of the corresponding position of the rotating shaft (1) of the pressure screen 0-4mm. 4. The mechanical seal of the slurry line pressure screen according to claim 3, characterized in that: the diameter of the shaft through hole (411) is equal to the shaft diameter of the pressure screen shaft (1) corresponding to it, and the two adopt clearance fit .