CN2200068Y - Rotating isolating type sealing device - Google Patents

Abstract

The utility model relates to a sealing device for a cylindrical multi-stage centrifugal pump of deep well type. The leakage is easily generated by a present sealing device; the sealing surface has poor cooling effect and is difficult to form a liquid membrane; the lifetime is short; the environment pollution can be generated. The utility model is characterized in that an isolating sleeve is sealed and fastened between the outside of the sealing device of the existing multi-stage centrifugal pump and between a chamber with an outlet and a press cover; a bearing bush is arranged between the lower end of the isolating sleeve and a rotating shaft; the inner end of the lower part of the isolating sleeve is provided with an inner conical surface which is correspondingly matched with the outer conical surface of the lower end of a shaft lining. The utility model is suitable for a cylindrical multi-stage centrifugal pump of deep well type widely used for oilfield and chemical industry enterprises.

Description

Rotating isolating type sealing device

The utility model relate to a kind of in oil, chemical enterprise widely used tubular deep-wall type multistage centrifugal Sealing used for pump.At present, what tubular deep-wall type multistage centrifugal pump (with reference to Fig. 1) adopted is the mechanical seal device that rotating ring 5 constitutes with stationary ring 6 phase configuration, because the not straight etc. of the decentraction of the balance error of multistage centrifugal pump impeller in rotation, muff 13, rotating shaft 1 all will exert an influence to the sealing surface of rotating ring with the stationary ring formation, sealing surface is misplaced with rotor swing, contact badly, easily produce the oil leakage of mechanical seal; Because this seal arrangement is arranged in the delivery side of pump chamber, is in the high-pressure medium, does not have any cooling method, only depend on high-pressure service pump liquid to take away the heat that sealing surface produces, therefore, cooling effect is poor, and sealing surface is difficult for forming liquid film, makes its life-span short; When the maintenance sealing, need the medium in the whole tube of multistage centrifugal pump to be got rid of and replaced clean, cause wastage of material, because tube is dark and serial connection shell construction complexity, so time swap is long, the remaining medium in dead angle is difficult for emptying, the maintenance difficulty, work efficiency is low, and when medium is the poisonous and harmful medium, dangerous big, also can cause certain environmental pollution.

The purpose of this utility model is to provide a kind of good seal performance for overcoming above-mentioned deficiency of the prior art, be difficult for producing shallow leakage, has cooling method, the rotationally isolated seal arrangement of tubular deep-wall type multistage centrifugal pump that sealing life is long, the repair time is short and convenient, safe.

The purpose of this utility model can reach by following measure: the utility model comprises by rotating shaft, the multi-stage impeller that the rotating shaft lower end connects, outside it, be set with and connect firmly inlet plenum in aggregates and outlet chamber, on gland, there is a hole to be communicated with the tubular deep-wall type multistage centrifugal pump that constitutes with inlet plenum by pipeline, by in the rotating shaft that penetrates the outlet chamber place in rotating shaft a muff being housed, in the muff upper end one gland is housed, in gland, be set with a stationary ring, in disposing a rotating ring that is loaded on the muff under the stationary ring, under rotating ring, have one to be loaded on snap ring on the muff to constitute the seal arrangement of existing multistage centrifugal pump, it is characterized in that the fastening airtight separation sleeve that is equipped with between the seal arrangement of the above-mentioned multistage centrifugal pump outside and outlet chamber and gland, between this separation sleeve lower end and rotating shaft, be fitted with a location bearing sleeve, have in the inner, separation sleeve bottom one with the opposed inner conical surface that matches of male cone (strobilus masculinus) of muff lower end.

Fig. 1 is existing multistage centrifugal pump schematic diagram of sealing device;

Fig. 2 is the designed multistage centrifugal pump schematic diagram of sealing device of the utility model.

The utility model is described in further detail below in conjunction with (accompanying drawing) embodiment: with reference to Fig. 2, multi-stage impeller 14 by rotating shaft 1, the connection of rotating shaft 1 lower end, outside rotating shaft 1 and multi-stage impeller 14, be set with and connect firmly inlet plenum in aggregates 10 and outlet chamber 3, on gland 8, there is a hole a to be communicated with inlet plenum 10, so constitutes tubular deep-wall type multistage centrifugal pump by pipeline 16; By a muff 13 is housed in the rotating shaft that penetrates outlet chamber 3 places in rotating shaft 1, in muff 13 upper ends one gland 8 is housed, in gland 8, be set with a stationary ring 6, dispose a rotating ring 5 that is loaded on the muff 13 for 6 times in stationary ring, at rotating ring one snap ring 15 that is loaded on the muff 13 is arranged for 5 times, so constitute the seal arrangement of existing multistage centrifugal pump, the fastening airtight separation sleeve 2 that is equipped with between the sealing device outside and outlet chamber 3 and gland 8, between these separation sleeve 2 lower ends and rotating shaft 1, be fitted with a location bearing sleeve 4, have in the inner, separation sleeve 2 bottom one with the opposed inner conical surface A that matches of male cone (strobilus masculinus) B of muff 13 lower ends.So just constituted the designed rotationally isolated seal arrangement of the utility model.The utility model working principle is as follows: with shaft coupling in the rotating shaft 1 12 and 11 fastening connections of motor shaft coupling, and make between the inner conical surface A of the male cone (strobilus masculinus) B of muff 13 lower ends and the inner, separation sleeve 2 bottom certain clearance is arranged, at this moment can drive rotating shaft 1 rotation by shaft coupling 11,12 by starting electrical machinery, rotating shaft 1 drives multi-stage impeller 14 rotations again, the rotation of multi-stage impeller 14 will be sent into media in the inlet plenum 10 and promote step by step through the centrifugal pressurization of multi-stage impeller and make it enter outlet chamber 3, and will be transported away by outlet; Enter and enter in the separation sleeve 2 after outlet chamber's 3 interior part high-pressure mediums produce the throttling hypotensive effects by positioning bearing lining 4, and the sealing attrition surface that rotating ring 5 and stationary ring 6 constitute is cooled off the back 16 return in the inlet plenum 10 by the road from the hole a on the gland 8, form normal working like this.When need maintenance seal arrangement parts, then shaft coupling 12 and 11 is thrown off, rotating shaft 1 moves down under the deadweight effect, the inner conical surface A of the male cone (strobilus masculinus) B of muff 13 lower ends and the inner, separation sleeve 2 bottom is closely cooperated form sealing, seal arrangement is partly isolated with outlet chamber 3 like this, only needs that the residual medium in the separation sleeve 2 is got rid of displacement and falls can carry out service work.

The utility model has following advantage compared to existing technology:

1, is fitted with a location bearing insert owing between separation sleeve lower end and rotating shaft, increasing, this location bearing lining has the spacing center line at pump of countershaft and rotates, eliminate the balance error of impeller, the not straight swing impact that waits countershaft to produce of rotating shaft, running is stable, thereby make difficult generation swing borrow between rotating ring and the stationary ring, improved Sealing property is difficult for producing and leaks;

2, because the positioning bearing lining of separation sleeve lower end has the throttling hypotensive effect to being entered by the high-pressure medium in the outlet chamber in the separation sleeve, make the pressure medium that enters in the separation sleeve be lower than the mechanical seal design load, during running, medium in the separation sleeve returns pump housing inlet plenum by gland a hole, form short circle, take away heat, thereby the low piezodielectric in the separation sleeve is to rotating ring, the friction sealing surface that stationary ring constitutes produces good cooling action, and easily form liquid film layer, make the sealing surface running stable, life-span is long, and little by using the intraoral high-pressure medium pressure loss after the throttling;

3, because can closely cooperating at the rotating shaft self-gravity action, the inner conical surface of the male cone (strobilus masculinus) of seal shaft lining lower end and the inner, separation sleeve bottom forms sealing, so when the maintenance sealed member, only needing that the small amount of residual medium in the separation sleeve is got rid of displacement falls, and need not get rid of a large amount of media in the pump housing, can carry out service work, needed time is short like this, and convenient, safety; When medium is the poisonous and harmful medium,, can not produce environmental pollution then because of discharge amount is few.

Claims (1)

1, a kind of rotationally isolated seal arrangement, comprise by rotating shaft, the multi-stage impeller that the rotating shaft lower end connects, outside it, be set with and connect firmly inlet plenum in aggregates and outlet chamber, on gland, there is a hole to be communicated with the tubular deep-wall type multistage centrifugal pump that constitutes with inlet plenum by pipeline, by in the rotating shaft that penetrates the outlet chamber place in rotating shaft a muff being housed, in the muff upper end one gland is housed, in gland, be set with a stationary ring, in disposing a rotating ring that is loaded on the muff under the stationary ring, under rotating ring, have one to be loaded on snap ring on the muff to constitute the seal arrangement of existing multistage centrifugal pump, it is characterized in that the fastening airtight separation sleeve that is equipped with between the seal arrangement of the above-mentioned multistage centrifugal pump outside and outlet chamber and gland, isolate to be fitted with a location bearing sleeve between big lower end and the rotating shaft at this, have in the inner, separation sleeve bottom one with the opposed inner conical surface that matches of male cone (strobilus masculinus) of muff lower end.

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