Gas protection type sealing structure for rotating main shaft of centrifugal machine

Abstract

The utility model discloses a centrifugal machine rotating main shaft gas protection type sealing structure which comprises a sealing support, a gas inlet connector is arranged on the top of the sealing support, a sealing gland is sleeved on the outer side of the sealing support, a gas inlet connector is arranged on the top of the sealing gland, a gas guide ring a is arranged on the inner side of the bottom of the sealing support, and a high-speed oil seal is sleeved on the outer side of the gas guide ring a. The side face of the sealing gland is provided with an air guide ring b, the lower end of the sealing gland is provided with a sealing seat, the outer side of the sealing gland is sleeved with a machine cover semicircular sealing ring, and a rotating main shaft is arranged below the air guide ring a. According to the utility model, gas flow and micro-positive pressure are formed at the to-be-sealed parts among the rotating main shaft, the engine base and the engine cover in a multi-stage sealing manner, so that materials can be effectively prevented from leaking to the external environment, and the sealing effect is achieved; the problems of serious potential safety hazards and the like caused by leakage when inflammable, explosive and harmful substances are separated are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas protection seals for centrifuge main shafts, and particularly relates to a gas protection type seal structure for a rotating main shaft of a centrifuge. Background Art

[0002] In industrial applications, the sealing of rotating shaft parts is a crucial issue, especially for the main shaft seals of high-speed rotating equipment such as centrifuges. Traditional sealing methods, such as skeleton oil seals and labyrinth seals, although performing well in some applications, their limitations will become apparent under specific conditions.

[0003] A skeleton oil seal is a common sealing method that prevents fluid leakage through the contact between the lip of the oil seal and the rotating shaft. However, when the material temperature is relatively high, the rubber material of the skeleton oil seal may lose its elasticity due to thermal aging, resulting in a decline in sealing performance. In addition, high temperature and high speed may also accelerate the wear of the oil seal material and reduce its service life. In some cases, the material atomizes due to the centrifugal force, causing the pressure on the sealing side to be slightly higher than that on the outside, which may lead to steam or other media more easily passing through the oil seal and causing leakage.

[0004] A labyrinth seal slows down the flow of fluid through a series of complex channels and gaps to achieve sealing. Although the labyrinth seal can effectively prevent leakage in some cases, it also has its limitations. The efficiency of the labyrinth seal depends on the design of the channels and the viscosity of the fluid. If the viscosity of the material is low or the temperature is high, the sealing effect of the labyrinth seal may be greatly reduced. In addition, the labyrinth seal may generate relatively large frictional forces and heat during high-speed rotation, which will not only reduce the efficiency of the equipment but also may accelerate the wear of the sealing material.

[0005] For the separation of flammable, explosive or harmful substances, the reliability of the seal is particularly important. Once leakage occurs, it will not only pollute the environment but also may trigger serious safety accidents such as fires and explosions. Summary of the Utility Model

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a gas protection type seal structure for a rotating main shaft of a centrifuge, which solves the problems such as serious potential safety hazards caused by leakage during the separation of flammable, explosive and harmful substances in the prior art.

[0007] A gas protection type sealing structure for the rotating main shaft of a centrifuge, comprising a sealing bracket. An air inlet joint is arranged at the top of the sealing bracket. A sealing gland is sleeved outside the sealing bracket. An air inlet joint is arranged at the top of the sealing gland. A gas guide ring a is arranged inside the bottom of the sealing bracket. A high-speed oil seal is sleeved outside the gas guide ring a. A gas guide ring b is arranged on the side of the sealing gland. A sealing seat is arranged at the lower end of the sealing gland. A machine cover semi-circular sealing ring is sleeved outside the sealing gland. Below the gas guide ring a is the rotating main shaft.

[0008] Further, a material blocking ring is connected to the outside of the gas guide ring b.

[0009] Further, a metal sealing ring is arranged between the sealing seat and the sealing gland.

[0010] Further, an O-ring is arranged between the machine cover semi-circular sealing ring and the sealing gland, and two O-rings are arranged side by side.

[0011] Further, the outside of the machine cover semi-circular sealing ring is connected to the rotating main shaft through an upper U-shaped spacer ring assembly.

[0012] Further, a machine cover semi-circular sealing ring is arranged outside the lower part of the rotating main shaft, and a lower U-shaped spacer ring assembly is arranged outside the machine cover semi-circular sealing ring.

[0013] The beneficial effects of the present utility model: The utility model enables multiple-stage sealing to be formed at the parts to be sealed between the rotating main shaft and the machine base and the machine cover, avoiding the leakage of materials due to internal pressure and extrusion at this place; especially avoiding serious safety hazard problems such as those generated when leakage occurs during the separation of flammable, explosive, and harmful substances. In addition, the gas can form a slightly positive pressure at the position of the spiral bearing oil seal through the internal channel of the shaft, effectively avoiding the entry of materials into the spiral bearing and achieving the effect of protecting the bearing. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of a gas protection type sealing structure for the rotating main shaft of a centrifuge;

[0015] Figure 2 It is an installation schematic diagram of a gas protection type sealing structure for the rotating main shaft of a centrifuge.

[0016] In the figure: 1 - air inlet joint, 2 - sealing bracket, 3 - gas guide ring a, 4 - high-speed oil seal, 5 - sealing gland, 6 - O-ring, 7 - first machine cover semi-circular sealing ring, 8 - gas guide ring b, 9 - material blocking ring, 10 - metal sealing ring, 11 - sealing seat, 12 - upper U-shaped spacer ring assembly, 13 - rotating main shaft, 14 - lower U-shaped spacer ring assembly, 15 - second machine cover semi-circular sealing ring. Detailed Embodiment

[0017] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model will be introduced in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details will be included in the following description. The present utility model can also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key points of the present utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0018] Unless otherwise defined, the technical terms or scientific terms used in the present utility model should have the ordinary meanings understood by those of ordinary skill in the art to which the present utility model belongs. The "first", "second" and similar terms used in the present utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar terms such as "a" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. The terms such as "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations. The orientation or positional relationship indicated by "up", "down", "left", "right", "inside", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0019] To make the purpose, technical solution and advantages of the present utility model clearer, the following will further describe the implementation manners of the present utility model in detail with reference to the drawings.

[0020] In this embodiment, as shown in the attached Figure 1-2As shown in the figure, a gas protection type sealing structure for the rotating main shaft of a centrifuge includes a sealing bracket 2. An air inlet joint 1 is arranged at the top of the sealing bracket 2. A sealing gland 5 is sleeved outside the sealing bracket 2. An air inlet joint 1 is arranged at the top of the sealing gland 5. A gas guide ring a3 is arranged inside the bottom of the sealing bracket 2. A high-speed oil seal 4 is sleeved outside the gas guide ring a3. A gas guide ring b8 is arranged on the side of the sealing gland 5. A sealing seat 11 is arranged at the lower end of the sealing gland 5. A first machine cover semi-circular sealing ring 7 is sleeved outside the sealing gland 5. Below the gas guide ring a3 is the rotating main shaft 13.

[0021] Further, a material blocking ring 9 is connected to the outside of the gas guide ring b8.

[0022] Further, a metal sealing ring 10 is arranged between the sealing seat 11 and the sealing gland 5.

[0023] Further, an O-ring 5 is arranged between the first machine cover semi-circular sealing ring 7 and the sealing gland 5, and two O-rings 5 are arranged side by side.

[0024] Further, the outside of the first machine cover semi-circular sealing ring 7 is connected to the rotating main shaft 13 through an upper U-shaped spacer ring assembly 12.

[0025] Further, a second machine cover semi-circular sealing ring 15 is arranged on the outside of the lower part of the rotating main shaft 13, and a lower U-shaped spacer ring assembly 14 is arranged on the outside of the second machine cover semi-circular sealing ring 15.

[0026] The specific working principle of this application is as follows:

[0027] This application is provided with five seals in total, and the specific settings are as follows:

[0028] The first seal structure is composed of two parts: the upper U-shaped spacer ring assembly 12 is installed on the upper drum guard, and the lower U-shaped spacer ring assembly 14 is installed on the machine base assembly. The upper and lower spacer rings are aligned on the end face of the rotating main shaft 13 to jointly form the first seal. This seal can effectively block most of the residues and water vapor. The upper U-shaped baffle is provided with a cap, while the lower U-shaped baffle is not closed at the bottom. A small amount of residues and water vapor enter the inner cavity formed by the U-shaped baffle and the main shaft through the gap between the upper and lower U-shaped plates. Part of the residues and water vapor are discharged through the notch at the bottom of the lower U-shaped baffle and fall into the discharge port of the centrifuge; the remaining part enters other seal structures.

[0029] The second seal is a static seal, and the sealing gland 5 is installed on the sealing bracket 2. Grooves are machined radially on the sealing gland, and an O-ring 6 is installed. The sealing gland, the O-ring, the machine cover semi-circular ring, and the machine base semi-circular ring jointly form a static seal to prevent residues and water vapor from overflowing from the gaps between the sealing gland and the machine base and the machine cover semi-circular sealing ring.

[0030] The third seal is formed by machining a groove axially on the gland 5, in which a gas guide ring b8 is installed. Meanwhile, a material retaining ring 9 is installed on the rotating shaft. The cooperation between the gas guide ring b8 and the material retaining ring forms a labyrinth seal in the axial direction to further prevent the leakage of materials.

[0031] The fourth seal is formed by machining a groove axially on the seal seat 11, on which a metal seal ring is installed. The seal seat, the metal seal ring and the gland jointly form a labyrinth seal in the radial direction, making it difficult for residues and water vapor to leak, thus achieving the sealing effect.

[0032] The fifth seal is formed by installing a high-speed oil seal 4 on the seal bracket 2, which forms an oil seal with the rotating main shaft 13.

[0033] If a very small amount of material leaks through the fifth seal and enters the gland, an outflow channel is machined at the lower part of the gland, through which the leaked material can flow back into the machine base in time.

[0034] The protective gas passes through the inlet joint 1 and flows along the gas channel inside the gland 5 to reach the gas guide ring b8. Then, the gas flows along the holes on the parts to the chamber of the centrifuge, forming a gas flow towards the seal side at the outlet, effectively preventing the leakage of atomized material particles from this place.

[0035] In addition, the protective gas can also pass through the inlet joint 1 and flow along the gas channel inside the seal bracket 2 to reach the gas guide ring 3a. Then, the gas flows along the circumferential holes on the parts and forms a slightly positive pressure between the high-speed oil seals 4. In addition, through the inlet holes on the rotating main shaft 13, the gas enters the oil seals on both sides of the spiral bearing position. A slightly positive pressure is formed at the oil seal position of the spiral bearing, which can effectively prevent materials from invading the spiral bearing.

[0036] The beneficial effects of the present utility model are as follows: The present utility model forms a multi-stage seal at the parts to be sealed between the rotating main shaft and the machine base and the machine cover, avoiding the leakage of materials due to internal pressure and extrusion at this place; especially avoiding serious safety hazards and other problems that may occur in case of leakage during the separation of flammable, explosive and harmful substances. In addition, the gas can form a slightly positive pressure at the oil seal position of the spiral bearing through the internal channel of the shaft, which can effectively prevent materials from entering the spiral bearing and achieve the effect of protecting the bearing.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A gas protection type sealing structure for the rotating main shaft of a centrifuge, characterized in that, It includes a sealing bracket (2) with an air inlet joint (1) provided at the top of the sealing bracket (2). A sealing gland (5) is sleeved outside the sealing bracket (2), and an air inlet joint (1) is provided at the top of the sealing gland (5). An air guide ring a (3) is provided inside the bottom of the sealing bracket (2), and a high-speed oil seal (4) is sleeved outside the air guide ring a (3). An air guide ring b (8) is provided on the side of the sealing gland (5), and a sealing seat (11) is provided at the lower end of the sealing gland (5). A first machine cover semi-circular sealing ring (7) is sleeved outside the sealing gland (5). Below the air guide ring a (3) is a rotating main shaft (13).

2. The gas protection type sealing structure of the rotating main shaft of a centrifuge according to claim 1, characterized in that, A material blocking ring (9) is connected to the outside of the air guide ring b (8).

3. The gas protection type sealing structure of the rotating main shaft of a centrifuge according to claim 1, wherein, A metal sealing ring (10) is provided between the sealing seat (11) and the sealing gland (5).

4. A gas protection type sealing structure for the rotating main shaft of a centrifuge according to claim 1, characterized in that, An O-ring (6) is provided between the first machine cover semi-circular sealing ring (7) and the sealing gland (5), and two O-rings (6) are arranged side by side.

5. The gas protection type sealing structure of a centrifuge rotating main shaft according to claim 1, characterized in that, The outside of the first machine cover semi-circular sealing ring (7) is connected to the rotating main shaft (13) through an upper U-shaped spacer ring assembly (12).

6. The gas protection type sealing structure of the rotating main shaft of a centrifuge according to claim 1, characterized in that, A second machine cover semi-circular sealing ring (15) is provided on the outside of the lower part of the rotating main shaft (13), and a lower U-shaped spacer ring assembly (14) is provided on the outside of the second machine cover semi-circular sealing ring (15).

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