CN2849247Y - Open type propeller shaft single end sealing structure of light and medium size load chemical pump - Google Patents

Abstract

The utility model relates to an open type impeller shaft single end sealing structure of a light and medium size load chemical pump, which comprises a shaft, a mechanical seal, a mechanical seal press cover and a shaft sleeve. The utility model is characterized in that the shaft sleeve is composed of inner and outer shaft sleeves; O-shaped sealing rings are arranged between the inner and the outer shaft sleeves which are cooperated with a key on the shaft; a key groove on the outer layer shaft sleeve, which corresponds to the key, has a gap in an axial direction; the position of the end face on the outer layer shaft sleeve, which corresponds to the mechanical seal press cover, is provided with a sink ring groove; a stop snap ring is arranged in the sink ring groove, and a projecting portion of the stop snap ring is attached to the end surface of the mechanical seal press cover. The two O-shaped sealing rings which are arranged between the inner and the outer shaft sleeves are respectively arranged at the head and the tail ends between the inner and the outer shaft sleeves. The utility model has the advantage that the utility model can relieve the looseness of the displacement of a mechanical seal moving ring and a stationary ring by the axial direction adjustment of the pump to enhance the service life and the safety of the mechanical seal, and thus, the operation of the pump is safe and economical.

Description

Light medium-sized load chemical pump unshrouded impeller axle single end face machine seal structure

Technical field

The utility model relates to a kind of machine seal structure, particularly a kind of light medium-sized load chemical pump unshrouded impeller axle single end face machine seal structure.

Background technique

Chemical pump is because the medium of its conveying is special, and working environment is special, so the Safety performance of pump has been proposed very high requirement, wherein requirement is the highest, also is that the machine that the easiest place that goes wrong is exactly a pump has sealed the position.Usually adopt the structure of unshrouded impeller and single end face machine envelope for the strong medium of some easy crystal corrosions, conventional way is that the machine envelope is installed on the axle sleeve, the main gap adjustment problem of considering impeller and cover plate on unshrouded impeller, common way is that axle integral body is moved forward to guarantee impeller and cover plate gap now, but the problem of Chu Xianing is exactly that the axle sleeve that is positioned on the axle can be with rotating ring to reach thereupon, the stationary ring that is positioned on the machine sealed cover is then motionless, the machine envelope fluffs so, add the corrosion of original medium and the friction of rotation, machine envelope distortion aggravation, this moment and may losing efficacy.Both dangerous for such situation, also can spend huge simultaneously because machine seals the shortening in life-span.

Summary of the invention

The purpose of this utility model is to solve the prior art middle open type impeller chemical pump rotating ring that the machine envelope is sealed because of the generation machine that moves of axle in adjusting impeller and cover plate gap and the stationary ring displacement existing the problems referred to above that fluff, and a kind of light medium-sized load chemical pump unshrouded impeller axle single end face machine seal structure is provided.The utility model designs light medium-sized load chemical pump unshrouded impeller axle single end face machine seal apparatus, comprise axle, mechanical seal, mechanical seal cover, axle sleeve, it is characterized in that: axle sleeve has inside and outside two axle sleeves to constitute, at inside and outside two shaft rooms O-ring seals is arranged, inside and outside two axle sleeves key on axle that matches, keyway with respect to key on the outer axle sleeve has the space in the axial direction, on outer axle sleeve with respect to the heavy annular groove in the end of mechanical seal cover, in heavy annular groove spacing snap ring is arranged, the bump phase-splitting of spacing snap ring is affixed on the end face of mechanical seal cover.The O-ring seals of inside and outside two shaft rooms has two, lays respectively at the head and the tail two ends of inside and outside two shaft rooms.The utility model has the advantages that great alleviation because machine envelope rotating ring and stationary ring displacement that the axial adjustment of pump brings fluff, thereby the life-span and the Security of increase machine envelope make the operation of pump safer and economical.

Description of drawings

Below in conjunction with drawings and Examples the utility model is elaborated,

Accompanying drawing is a structural representation of the present utility model,

Embodiment

Comprise axle 1, mechanical seal 2, mechanical seal cover 3, axle sleeve among the figure, it is characterized in that: axle sleeve has inside and outside two axle sleeves 4,5 to constitute, on 4,5 on inside and outside two axle sleeves O-ring seals 6 is arranged, inside and outside two axle sleeves 4,5 key 7 on axle 1 that matches, keyway (do not have on the figure and draw) with respect to key 7 on the outer axle sleeve 5 upwards has the space at axle 1, on outer axle sleeve 5 with respect to the heavy annular groove 8 in the end of mechanical seal cover 3, spacing snap ring 9 is arranged in heavy annular groove 8, and the bump phase-splitting of spacing snap ring 9 is affixed on the end face of mechanical seal cover 3.The O-ring seals 6 that inside and outside two axle sleeves are 4,5 has two, lays respectively at the head and the tail two ends of 4,5 on inside and outside two axle sleeves.

Change common machine envelope axle sleeve into double-deck combination axle sleeve by present single axle sleeve, be internal axle sleeve 4 promptly with the contacted axle sleeve of axle, be used for realizing axially locating with axle 1 and impeller, realize the static seal of impeller and shaft room simultaneously, skin at it overlaps last layer external axle sleeve 5 again, the two ends that external axle sleeve 5 and internal axle sleeve are 4 are the static seal of O-ring seals 6, they rotate together by a common key 7 driving belt motivations envelope rotating ring, when needs move forward axle 1 integral body, internal axle sleeve 4 moves with axle 1, and the spacing snap ring 9 of external axle sleeve 5 on external axle sleeve 5 will keep suitable position down with the spacing of mechanical seal cover 3, and do not move, thereby bring bigger deformation displacement can for the rotating ring and the stationary ring of mechanical seal with axle 1 yet.Simultaneously since 4,5 of exterior and interior axle sleeves be the static seal of O-ring seals 6, and two O-ring seals 6 are set simultaneously, so the sealing of shaft room has also obtained reliable assurance, can alleviate the distortion that brings because of axial adjustment so greatly, thus the life-span and the Security of increase machine envelope.Advantage of the present utility model is safer and economical.

Claims (2)

1, light medium-sized load chemical pump unshrouded impeller axle single end face machine seal apparatus, comprise axle, mechanical seal, mechanical seal cover, axle sleeve, it is characterized in that: axle sleeve has inside and outside two axle sleeves to constitute, at inside and outside two shaft rooms O-ring seals is arranged, inside and outside two axle sleeves key on axle that matches, keyway with respect to key on the outer axle sleeve has the space in the axial direction, on outer axle sleeve with respect to the heavy annular groove in the end of mechanical seal cover, in heavy annular groove spacing snap ring is arranged, the bump phase-splitting of spacing snap ring is affixed on the end face of mechanical seal cover.

2, by the described light medium-sized load chemical pump unshrouded impeller axle single end face machine seal apparatus of claim 1, it is characterized in that: the O-ring seals of inside and outside two shaft rooms has two, lays respectively at the head and the tail two ends of inside and outside two shaft rooms.

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