CN205020395U - Exempt from to dismantle forced filler bearing seal of self -interacting - Google Patents

Abstract

The utility model provides an exempt from to dismantle forced filler bearing seal of self -interacting, including installing the cyclic annular packing groove between box and sieve axle, cyclic annular packing groove cross -section be trapezoidal, cyclic annular packing groove includes box shutoff flange, bearing seal gland and a sieve axle axle sleeve, on wherein box shutoff flange was fixed in the box, on bearing seal gland was fixed in box shutoff flange, sieve axle axle sleeve rotated along with the sieve axle, was equipped with at least 0.5mm's rotary clearance between box shutoff flange, bearing seal gland and the sieve axle axle sleeve. The utility model has the characteristics of low in manufacturing cost is honest and clean, the succinct practicality of structure, and long service life is of a specified duration, and it is convenient etc. That the maintenance is changed. Effectively has stopped the hourglass coal dirt that overflows, has eliminated here noise, controlled the harm of coal dust to personnel and equipment, greatly reduced equipment trouble rate, practiced thrift maintenance maintenance cost, the effective control coal dust potential safety hazard and the accident that leak and cause.

Description

Exempt from the forced packing shaft seal of dismounting self-regulation

Technical field

The utility model relates to field, and specifically one exempts from the forced packing shaft seal of dismounting self-regulation.

Background technology

Roller picker in the coal handling system of thermal power plant is generally arranged on (room) between coal handling system broken coal, and device interior working environment is complicated, and dust is high, high humidity, vibration are violent.Between severe working condition requirement casing and sieve axle, there is the shaft seal of economic science.

Sealing between current sieve axle and casing, most of equipment use band skeleton rubber sealing ring sealing, equipment component uses hair felt-ring seal, and individual plants adopts dynamic and static ring labyrinth sealing.Use band skeleton rubber sealing ring as shaft seal, have national standard (GB/T10708.3-2000) series, be widely used; Use hair felt-ring seal as shaft seal, cost is the cheapest; Use dynamic and static ring labyrinth sealing as shaft seal, see below figure, good dustproof effect.

Band skeleton rubber sealing ring: the dust seal in national standard is derived from oil sealing from structure, principle to material, and oil sealing is only suitable for the smooth high speed shaft shutoff liquid state of mating surface or semisolid medium, so the coal dust effect of band skeleton rubber sealing ring to the uneven solid granular of shutoff is undesirable, concrete shortcoming is as follows:

(1) serious wear, service life is short, there is potential safety hazard.Coal dust scratches rubber ring mating surface after clamp-oning sealing ring and the gap of sieve axle, expands sealing ring and the gap of sieve axle, more coal dust is entered, and finally cause the seal failure dirt that overflows to leak coal, even lump coal dust temperature arrising caused by friction, the aging burning of cushion rubber.

(2) maintain and replace is wasted time and energy.When band skeleton rubber sealing ring is changed, parts all for sealing ring side are needed all to remove, comprise casing plugging plate, sieve axle axle sleeve, stripped nut, a complete set of bearing block and bearing and shaft coupling, motor reducer, operation is many, man-hour is long, increases other standby redundancy spoilage.

(3) during maintain and replace, assembly precision is comparatively difficult to ensure card.Band skeleton rubber sealing ring is installed axiality and is required to be less than 0.5mm, and casing plugging plate is that bolt connects, installation accuracy ± 2mm.Band skeleton rubber sealing ring not easily centering after changing, installs if eccentric, increases wearing and tearing, shorten life cycle.

Hair felt-ring seal: felt collar material is banded half common and braid wool felt, bevelled junction synthesis of cyclic, be placed in groove and use, applicable speed is less than 5m/s.The sealing of felt circle is with low cost, but seems too simple and crude as roller picker shaft seal, and concrete shortcoming is as follows:

(1) result of use is poor.Felt circle without axial strength, equipment exert oneself increase time coal dust can easily from groove with sieve shaft clearance (0.5-2mm) spill.

(2) serious wear, service life is short.Inner at the roller picker of large high humidity acid-base value, the groove placing felt circle, easily corrosion occurring with the sieve thin place of near point that is coupling and shoal, causes felt circle to come off; In addition, enter sealing ring and grind intensification for a long time with the particle of sieve shaft clearance, also can cause the felt circle de-oiling of oil immersion, drying, cracked and come off.

(3) maintain and replace is wasted time and energy.Dismounting is the same.

Dynamic and static ring labyrinth sealing: as shown in Figure 1, only uses on only a few equipment.Dynamic and static ring labyrinth sealing application dynamic and static ring sealing principle, rotating ring and axle sleeve interference fit, rotate with angular speed with sieve axle, stationary ring and shaft packing and gland thereof are connected and fixed by bolt and casing, reduce dust and overflow kinetic energy, extend dust overflow path, in the end stage direct shaft packing shutoff.This form shaft seal good dustproof effect, but there is not penetration and promotion so far, reason is as follows:

(1) structure is numerous and diverse, and assembly precision is harsh.

(2) fluctuation of service.Equipment dynamically operates, and set bolt creep loosens, corrosion can cause dynamic and static ring to interfere when loosening, friction, produces resistance, noise, temperature rise, causes dynamo-electric operation to occur hidden danger.

(3) service life is limited.Behind coal dust blocking labyrinth, grinding is hardened, wearing and tearing dynamic and static ring maze trough.

(4) maintain and replace is wasted time and energy.Dismounting is the same.

(5) during maintain and replace, assembly precision is difficult to ensure.Can not keep in repair, take rear extremely difficult recovery apart.

Utility model content

The utility model, in order to solve the problem of prior art, provides one and exempts from dismounting self-regulation forced packing shaft seal, has effectively stopped leakage coal and to have overflow dirt, eliminated noise herein, greatly reduce equipment failure rate, and saved cost.

The utility model comprises the annular packing groove be arranged between casing and sieve axle, described annular packing slot cross-section is trapezoidal, annular packing groove comprises casing shutoff flange, shaft packing gland and sieve axle axle sleeve, wherein casing shutoff flange is fixed on casing, shaft packing gland is fixed on casing shutoff flange, sieve axle axle sleeve rotates with sieve axle, casing shutoff flange, is provided with the revolution gap of at least 0.5mm between shaft packing gland and sieve axle axle sleeve.Shaft packing is by shaft packing gland press-in packing groove.

Further improvement, described shaft packing gland is provided with adjusting bolt, can adjust pretightning force by three groups of adjusting bolts.

The utility model beneficial effect is:

1, cheap for manufacturing cost, practicality simple for structure, long perfomance life, maintain and replace is convenient.

2, effectively stopped leakage coal to overflow dirt, eliminated noise herein, controlled the harm of coal dust to personnel and equipment, greatly reduce equipment failure rate, saved repair and maintenance expense, effectively controlled coal dust and to leak the potential safety hazard and accident that cause.

Accompanying drawing explanation

Fig. 1 is dynamic and static ring labyrinth seal structure schematic diagram in prior art.

Fig. 2 is the utility model structural representation.

Fig. 3 is the utility model installation diagram.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model is described in further detail.

The utility model structure as shown in Figure 2, comprise the annular packing groove be arranged between casing and sieve axle, described annular packing slot cross-section is trapezoidal, annular packing groove comprises casing shutoff flange 1, shaft packing gland 2 and sieve axle axle sleeve 3, wherein casing shutoff flange 1 is fixed on casing, shaft packing gland 2 is fixed on casing shutoff flange 1, and sieve axle axle sleeve 3 rotates with sieve axle, casing shutoff flange 1, is provided with the revolution gap of at least 0.5mm between shaft packing gland 2 and sieve axle axle sleeve 3.Described shaft packing gland 2 is provided with adjusting bolt 5.Shaft packing 4 is pressed in packing groove by shaft packing gland 2, adjusts pretightning force by three groups of adjusting bolts 5.

Utility model works method is as follows:

Shaft packing being arranged on cross section is in trapezoidal annular packing groove.During work, the pretightning force of gland produces component along trapezoidal hypotenuse vertical direction, acts on shaft packing, and shaft packing is wriggled to the sieve axle axle sleeve direction that can discharge internal stress, and is formed with sieve axle axle sleeve resistance and balance.In filler wear process, balance sysmte is broken then to be stood, iterative cycles, thus realizes shaft packing and to be worn supplementing voluntarily of part.

When reaching maintenance cycle, only need compress adjusting bolt, supplying the pretightning force of inefficacy, can continue to use.When reaching the replacement cycle, only need unclamp adjusting bolt and exit gland, clearing up the new filler of old remaining replacement, can maintenance be completed.

As shown in Figure 3, exchonge step is as follows for the utility model installation diagram:

1, three groups of adjustment bolts on gland are unclamped;

2, gland is exited;

3, thoroughly cleaning exceedes the waste and old filler of life cycle;

4, suitable length pounded pine and soaked the shaft packing after machine oil, being cut into overlap joint angle, evenly coiling cross section is in trapezoidal packing groove;

5, with after the first compacting shaft packing of gland, then the elasticity of shaft packings is adjusted by three groups of adjusting bolts;

6, elasticity is determined by its flexibility ratio during dish dynamic sieve axle

7, maintain and replace record is done in detail, in order to next maintenance cycle, replacement cycle reference.

The utility model embody rule approach is a lot; the above is only preferred embodiment of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvement, these improvement also should be considered as protection domain of the present utility model.

Claims (2)

1. exempt from the forced packing shaft seal of dismounting self-regulation for one kind, comprise the annular packing groove be arranged between casing and sieve axle, it is characterized in that: described annular packing slot cross-section is trapezoidal, annular packing groove comprises casing shutoff flange (1), shaft packing gland (2) and sieve axle axle sleeve (3), wherein casing shutoff flange (1) is fixed on casing, shaft packing gland (2) is fixed on casing shutoff flange (1), sieve axle axle sleeve (3) rotates with sieve axle, casing shutoff flange (1), the revolution gap of at least 0.5mm is provided with between shaft packing gland (2) and sieve axle axle sleeve (3).

2. according to claim 1 exempting from dismantles the forced packing shaft seal of self-regulation, it is characterized in that: described shaft packing gland (2) is provided with adjusting bolt (5).