CN213541285U

CN213541285U - Sealing structure for vertical soaking rotary main shaft

Info

Publication number: CN213541285U
Application number: CN202022747302.9U
Authority: CN
Inventors: 王春梅; 刘剑波; 何黎明; 朱家生
Original assignee: Chongqing Gearbox Co Ltd
Current assignee: Chongqing Gearbox Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-06-25
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a sealing structure for a vertical soaking rotary main shaft, which comprises a cavity body and an end cover, wherein the cavity body is sleeved on the periphery of the main shaft and is in static sealing connection; a first sealing ring, a static ring and a dynamic ring are sequentially arranged between the inner spaces of the cavity and the end cover and the main shaft from the soaking environment to the outside; the first sealing ring is sleeved on the main shaft, and a first O-shaped ring is arranged between the first sealing ring and the end cover; the static ring and the dynamic ring are made of materials with different hardness; the static ring is arranged on the cavity, a second O-shaped ring is arranged between the static ring and the cavity, a gap is reserved between the static ring and the main shaft, and the static ring is also abutted against the movable ring; the movable ring is in interference fit with the main shaft, a third O-shaped ring is sleeved on the movable ring, and a second sealing ring is arranged between the third O-shaped ring and the cavity. The beneficial effects of the utility model are that, guarantee sealed effect through multiple seal structure's ingenious combination, the epicoele of specially adapted cement building materials and thermal power industry mechatronic equipment is soaked, and the vertical main shaft of greasy dirt is stopped to the cavity of resorption. The structure is simple, and the service life is long.

Description

Sealing structure for vertical soaking rotary main shaft

Technical Field

The utility model relates to a rotation axis sealing technique, especially a vertical seal structure for soaking rotatory main shaft.

Background

The economic operation condition of an auxiliary engine motor in the cement building material and thermal power industry is directly related to the operation efficiency of equipment. With the continuous deepening of the national supply side innovation, energy conservation and consumption reduction become the targets of the pursuit of various manufacturers. With the development of permanent magnet motors in recent years, electromechanical integrated equipment gradually leaves open corners in the projects of cement building materials and thermal power industry improvement. The electromechanical integration is to combine a motor and the traditional mechanical transmission by using a rotating main shaft and directly drive the mill to operate. Because redundant intermediate links are removed, the system chain is simple and clear, and has the remarkable characteristics of high efficiency and energy conservation, but the lubrication and cooling systems of the electrical part and the mechanical part are required to be independent respectively. The vertical type oil-water separator is composed of an upper part and a lower part, wherein a rotating main shaft penetrates through the whole product, the structural arrangement is that a mechanical part is usually arranged at the upper part, a motor is arranged at the lower part, and lubricating oil for the mechanical parts of the upper part is firstly retained on the connecting surface of the upper shell and the lower shell under the action of gravity and then is guided by an oil return pipe. The sealing elements are here all immersed in lubricating oil. If lubricating oil or oil mist enters the motor cavity, the moisture is increased, corona discharge can be slowly caused, a winding coil is corroded, and the serious result of motor failure is caused. Therefore, the key to guarantee one equipment operation period is to make a seal.

The sealing mode of the rotating shaft in the prior art is mostly applied to contact type lubricating oil and non-contact type lubricating oil. The non-contact type immersion rotary main shaft mainly adopts labyrinth seal, and the vertical immersion rotary main shaft which prevents oil stains in the lower cavity cannot be suitable for immersion in the upper cavity. The most extensive mode of skeleton oil blanket is adopted in the contact, and the skeleton lip adopts butadiene-acrylonitrile rubber mostly, has great resilience, and the advantage lies in that lip and axle contact width is narrower, has fine following compensatory ability. But the wear resistance of the lip is closely related to the finish of the mating shaft, type of lubricant, line speed, temperature and pressure differential, in addition to being dependent on its own material properties. The special tool is needed during installation and disassembly, in the occasion of long-term soaking of lubricating oil, impurities in oil also affect the wear resistance of the lip, and in the environment of soaking the upper cavity and stopping oil contamination of the lower cavity, the impurities in the oil are deposited on the sealing element more under the action of gravity, so that the wear resistance of the skeleton oil is obviously more strongly affected. And the framework oil seal can aggravate the abrasion of the matched shaft section along with the time, and extra repair cost is generated. And the traditional framework oil seal is worn along with the lip or the shaft section, so that the seal fails. Even if the service life is as long as three years, the oil seal or the shaft section needs to be replaced once, which is extremely unsuitable for 30-year service life of cement building materials and thermal power industries. The framework oil seal can cause the pollution of lubricating oil along with the abrasion of the lip or the shaft section, the oil change period is shortened, and the extra maintenance cost is increased. Therefore, how to have a long service life under the premise of ensuring efficient and reliable sealing performance becomes a difficult problem to be solved by the technical personnel in the field.

Disclosure of Invention

The utility model aims at providing a vertical seal structure for soaking rotatory main shaft to the problem that current seal structure is not suitable for vertical rotatory main shaft that soaks to through the ingenious combination of multiple seal structure, solve traditional seal structure and be not suitable for the vertical problem of soaking rotatory main shaft.

In order to achieve the above purpose, the present invention adopts the following technical solution.

A sealing structure for a vertical soaking rotary main shaft comprises a cavity body and an end cover which are sleeved on the periphery of the main shaft, wherein the cavity body and the end cover form static sealing connection; a first sealing ring, a static ring and a dynamic ring are sequentially arranged between the inner spaces of the cavity and the end cover and the main shaft from the soaking environment to the outside; the first sealing ring is sleeved on the main shaft, and a first O-shaped ring is arranged between the first sealing ring and the end cover; the static ring and the dynamic ring are made of materials with different hardness; the static ring is arranged on the cavity, a second O-shaped ring is arranged between the static ring and the cavity, a gap is reserved between the static ring and the main shaft, and the static ring is also abutted against the movable ring; the movable ring is in interference fit with the main shaft, a third O-shaped ring is sleeved on the movable ring, and a second sealing ring is arranged between the third O-shaped ring and the cavity.

By adopting the sealing structure of the technical scheme, a first layer of rotary sealing is formed between the main shaft and the end cover through the first sealing ring and the first O-shaped ring; a second layer of seal is formed between the main shaft and the cavity through the static ring and the moving ring which are made of materials with different hardness, meanwhile, the second layer of seal also comprises a static ring and a rotary seal formed between the moving ring and the cavity through a second O-shaped ring and a second O-shaped ring. The first layer of seal and the second layer of seal are formed in sequence from a soaking environment to the outside, the second layer of seal comprises a plane seal forming a main seal, and a static ring and a dynamic ring of a plane seal component are sealed by extrusion seal and rotary seal, the second layer of seal of the combined seal structure is formed by three seal forms, the seal ring is usually made of wear-resistant packing with good wear resistance and low friction coefficient, and the plane seal is formed by abutting the dynamic ring and the static ring which are made of materials with different hardness, a wider and thicker oil film can be formed in the oil soaking environment, the continuous abrasion between the two is reduced or eliminated by utilizing the friction pair principle and the oil film tension of lubricating oil, the good plane seal is formed, and the service life is long, the problem of low service life of the traditional seal structure is effectively solved, meanwhile, the seal effect is ensured by utilizing a multiple seal structure, and the combined seal structure is particularly suitable for soaking in an upper cavity required, the lower cavity prevents oil contamination of the vertical soaking rotating main shaft. The structure has the advantages of ingenious conception, simple structure and good sealing effect.

Preferably, the stationary ring is only movably connected to the chamber, and a plurality of circumferentially distributed elastic elements are provided between the stationary ring and the end cap. The joint surface of the static ring and the dynamic ring is always kept in contact through the automatic loading of the elastic element, and the continuity of the sealing effect is ensured. Wherein, the elastic element comprises a spring, an elastic cushion made of oil-resistant elastomer material, an elastic sleeve and the like. Springs, preferably elastomeric pads or sleeves, are disposed through mounting holes in the end caps to maintain the circumferentially distributed state.

Preferably, the gap is 0.1mm to 0.3 mm. So as to ensure that a relatively reasonable clearance is formed between the main shaft and the static ring, ensure that the main shaft and the static ring do not interfere with each other, and ensure that too much oil can not flow through the static ring.

Preferably, the first sealing ring is made of a fluorine fiber filler which is polytetrafluoroethylene as a main component; the static ring is made of carbon steel, and the moving ring is made of phosphor bronze. The polytetrafluoroethylene has good wear resistance, self-lubricating property and corrosion resistance, the friction coefficient is only 0.02, the heat productivity is extremely low, and cooling is not required to be considered; the phosphor bronze material is relatively soft, the carbon steel is relatively hard, the relative friction coefficient of the phosphor bronze material and the carbon steel is small, the heat generation is small, the ablation seizure phenomenon is eliminated, and the sealing reliability is ensured. Preferably, a matching spigot is formed between the static ring and the dynamic ring, the matching spigot is that one of the dynamic ring and the static ring is provided with an annular bulge, the other is provided with an annular sinking platform for receiving the bulge, and the depth of the sinking platform is greater than the height of the bulge.

Preferably, a fit clearance of 0.1mm-0.3mm is formed between the static ring and the cavity. A fit clearance of 0.1mm-0.3mm is formed between the static ring and the cavity, so that the outer diameter and the inner diameter of the static ring and corresponding fitting parts form a clearance fit state; preferably, a stop pin is further arranged between the static ring and the cavity and used for guiding the static ring to move. The phosphor bronze is relatively soft, so that slight abrasion can be caused in the initial running-in period, and under the condition of having the elastic element, the elastic force of the elastic element enables the two joint surfaces of the movable ring and the static ring to be always tightly jointed; after the running-in period, the two joint surfaces are matched with each other along with the formation of the oil film, the abrasion can be ignored, and good plane sealing is formed; thereby making full use of the excellent characteristics of the material, simplifying the structure and ensuring long service life.

The beneficial effects of the utility model are that, realize the effective seal of vertical rotatory main shaft through double-deck sealed mode, wherein, the first layer is the rotary seal who forms through the sealing ring, the second floor is sealed including the plane seal who constitutes main seal, and carry out sealed extrusion seal and rotary seal to the quiet ring of plane seal component and rotating ring, three kinds of sealed forms constitute composite seal structure's second floor and seal, it is good to utilize sealing ring and plane seal wearability, long service life's characteristics, the problem that traditional seal structure life-span is low has effectively been solved, and simultaneously, utilize multiple seal structure to ensure sealed effect, the epicoele that specially adapted cement building materials and thermoelectricity trade electromechanical integrated equipment soak, the vertical rotatory main shaft that soaks of greasy dirt is stopped to the cavity of resorption. The structure is simple, and the service life is long.

Drawings

Fig. 1 is a schematic structural diagram of the device of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the embodiments described herein.

Referring to fig. 1, a sealing structure for a vertical soaking rotary spindle comprises a cavity 7 and an end cover 4 which are sleeved on the periphery of the spindle 1, wherein the cavity 7 and the end cover 4 form static sealing connection; a first sealing ring 2, a static ring 6 and a dynamic ring 10 are sequentially arranged between the inner spaces of the cavity 7 and the end cover 4 and the main shaft 1 from the soaking environment to the outside; the first sealing ring 2 is sleeved on the main shaft 1, and a first O-shaped ring 3 is arranged between the first sealing ring 2 and the end cover 4; the static ring 6 and the dynamic ring 10 are made of materials with different hardness; the static ring 6 is arranged on the cavity 7, a second O-shaped ring 9 is arranged between the static ring 6 and the cavity 7, a gap of 0.1mm-0.3mm is reserved between the static ring 6 and the main shaft 1, and the static ring 6 is also abutted against the movable ring 10; the movable ring 10 is in interference fit with the main shaft 1, a third O-shaped ring 12 is sleeved on the movable ring 10, a second sealing ring 13 is arranged between the third O-shaped ring 12 and the cavity 7, and the first sealing ring 2 is made of a fluorine fiber filler mainly comprising polytetrafluoroethylene; the static ring 6 is made of carbon steel, and the moving ring 10 is made of phosphor bronze; a fourth O-shaped ring is arranged between the combining surfaces of the cavity 7 and the end cover 4.

The static ring 6 is only movably connected with the cavity 7, a plurality of elastic elements 11 distributed circumferentially are arranged between the static ring 6 and the end cover 4, the elastic elements 11 specifically adopt cylindrical compression springs, the number of the elastic elements is 8-12 according to the circumferential uniform distribution mode, the end cover 4 is provided with spring mounting holes, and the upper ends of the cylindrical compression springs are mounted in the spring mounting holes; a matching spigot is arranged between the static ring 6 and the dynamic ring 10; the static ring is provided with an annular bulge, the movable ring is provided with a raised annular sinking platform, the depth of the annular sinking platform is greater than the height of the bulge, and the end face of the static ring 6, which is in contact with the movable ring 10, is ensured to be always kept in butt joint; a fit clearance of 0.1mm-0.3mm is formed between the static ring 6 and the cavity 7; a stop pin 8 is arranged between the static ring 6 and the cavity 7.

In this embodiment, the cylindrical compression spring may be replaced by a conical compression spring or a disc spring, or may be replaced by an elastic pad or an elastic sleeve made of an oil-resistant and oil-resistant elastomer material.

In this embodiment, the annular projection forming the mating spigot may be provided on the moving ring 10 and the corresponding annular platform on the stationary ring 6.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A sealing structure for a vertical soaking rotary main shaft is characterized by comprising a cavity (7) and an end cover (4) which are sleeved on the periphery of a main shaft (1), wherein the cavity (7) and the end cover (4) form static sealing connection; a first sealing ring (2), a static ring (6) and a dynamic ring (10) are sequentially arranged between the inner space of the cavity (7) and the end cover (4) and the main shaft (1) from the soaking environment to the outside; the first sealing ring (2) is sleeved on the main shaft (1), and a first O-shaped ring (3) is arranged between the first sealing ring (2) and the end cover (4); the static ring (6) and the dynamic ring (10) are made of materials with different hardness; the static ring (6) is arranged on the cavity (7), a second O-shaped ring (9) is arranged between the static ring (6) and the cavity (7), a gap is reserved between the static ring (6) and the main shaft (1), and the static ring (6) is also abutted against the moving ring (10); the movable ring (10) is in interference fit with the main shaft (1), a third O-shaped ring (12) is sleeved on the movable ring (10), and a second sealing ring (13) is arranged between the third O-shaped ring (12) and the cavity (7).

2. The seal according to claim 1, characterized in that the stationary ring (6) is only movably connected with the cavity (7), and that a plurality of circumferentially distributed elastic elements (11) are provided between the stationary ring (6) and the end cap (4).

3. The seal structure of claim 1, wherein the gap is 0.1mm-0.3 mm.

4. The seal structure of claim 1, characterized in that the first seal ring (2) is made of a filler of fluorine fibers, the main component of which is polytetrafluoroethylene; the static ring (6) is made of carbon steel, and the moving ring (10) is made of phosphor bronze.

5. The seal according to claim 1, characterized in that a mating spigot is provided between the stationary ring (6) and the moving ring (10).

6. The seal according to any one of claims 1 to 5, characterized in that a fit clearance of 0.1mm to 0.3mm is provided between the stationary ring (6) and the cavity (7).

7. The seal according to claim 6, characterized in that a stop pin (8) is also provided between the stationary ring (6) and the cavity (7).