CN203009315U

CN203009315U - Low-temperature immersed pump with single flow guide chamber

Info

Publication number: CN203009315U
Application number: CN 201220718647
Authority: CN
Inventors: 江涛; 杨国柱; 甘鹏; 马颖玲; 罗军; 魏瑛; 武佳慧
Original assignee: CHENGDU ANDERSON MEASUREMENT Co Ltd
Current assignee: Chengdu Kangbo Networking Technology Co ltd
Priority date: 2012-12-24
Filing date: 2012-12-24
Publication date: 2013-06-19
Anticipated expiration: 2022-12-24

Abstract

The utility model provides a low-temperature immersed pump with a single flow guide chamber. The low-temperature immersed pump is characterized in that an inducer is fixed on a shaft portion of a rotor shaft through a shaft-end screw, a filtering cover is positioned at the inlet end of a lower shell which is fixed with an upper shell through connecting bolts, a primary impeller and a secondary impeller are fixed on the rotor shaft, a lower bearing and an upper bearing are arranged at corresponding positions on the rotor shaft, a bearing dust retaining ring is arranged on the lower bearing, a bearing cooling nozzle is arranged on an adjusting washer which is arranged on the upper bearing, conveying pipes are positioned between the upper shell and a pump outlet pipe, conveying pipe sealing rings are arranged at joints of the conveying pipe, a primary flow guide ring is fixed with the upper shell through fixing screws, and the flow guide chamber is formed in the upper shell. By the improved mode that a flow guide chamber is omitted in a flow channel structure, when the pump runs, medium flowing distance can be shortened; by omitting a flow guide ring to form a secondary pump structure with the single flow guide chamber, medium resistance can be lowered, vibration can be reduced, overall weight can be reduced, cost can be saved, and overall efficiency of the pump can be improved.

Description

A kind of low temperature immersed pump of single diversion chamber

Technical field

The utility model relates to a kind of pump, is specifically a kind of low temperature immersed pump of single diversion chamber, is mainly used in the conveying of the cryogenic liquides such as LNG Liquefied natural gas (hereinafter to be referred as LNG) except liquid oxygen.

Background technique

Current China greatly develops LNG Liquefied natural gas (LNG) industry, becomes to adjust Energy Mix, alleviate the major action to the dependence of oil supply and pressure, guarantee Chinese energy safety.In the whole industrial chain of LNG, the links such as its output, transhipment, reception, utilization all will be used cryopump, and this makes LNG low temperature transport pump to have played the part of very important role in industrial chain.

LNG low temperature immersed pump is the machinery that a kind of pump and motor integral slip into transporting low temperature medium in low temperature LNG.Due to the low temperature of LNG (when pressure store is 0.1 MPa, saturation temperature is about-162 ℃) and inflammable characteristic, the runner design of this low temperature immersed pump is very crucial, therefore the length of pump runner has directly had influence on flow and the lift of pump of pump, structure, similar import pump can be gone up all deficiency to some extent at flow passage structure and flow channel length in the past, was embodied in:

(1) similar pump has second diversion chamber identical with single diversion chamber on pump chamber in the past, medium will again be transferred and enter the second diversion chamber after pump chamber 2, the runner turning point is too much, this structure that adopts upper and lower two identical diversion chamber on runner design, its flow channel length is excessive, and resistance of medium is corresponding increase also, the resistance of the longer fluid of the on-stream runner of pump is larger, produce certain pressure loss simultaneously, the contrast demonstration, under identical operating mode, the design of this kind of runner has reduced the overall performance of pump;

(2) structure of this pair of diversion chamber is to having increased the length of rotor shaft, and far-end easily produces radial vibration under centrifugal action, and the whole height of pump increases, mass penalty, pump housing stiffness degradation.

The model utility content

The purpose of this utility model is to overcome the deficiency that existing similar pump exists, provide a kind of low temperature immersed pump of single diversion chamber at this, while being to improve LNG low temperature immersed pump fed sheet of a media, reduce flow channel length, reduce resistance of medium, reduce vibration, alleviate complete machine weight, cost-saving, the overall efficiency of raising pump.

The utility model is achieved in that the low temperature immersed pump of a kind of single diversion chamber of structure, it is characterized in that: comprise filter cap, inducer, lower shell body, the one-level impeller, sencond stage impeller, the one-level guide ring, upper shell, the secondary guide ring, the bearing guard konisphere, delivery pipe, rotor, motor stator, rotor shaft, the delivery pipe seal ring, the cooling mouth of bearing, pump discharge pipe, the axle head screw, key, connecting bolt, retaining screw, lower lining, lower bearing, upper bearing (metal), adjusting washer (disk) and upper lining, be medium channel in delivery pipe, and inducer is fixed on the rotor shaft axial region by the axle head screw, and filter cap is positioned at the entrance point of lower shell body, and lower shell body and upper shell are fixed by connecting bolt, the one-level impeller, sencond stage impeller is fixed on rotor shaft, and on rotor shaft, corresponding position is provided with lower bearing, upper bearing (metal), lower bearing is provided with the bearing guard konisphere, upper bearing (metal) is provided with adjusting washer (disk), the cooling mouth of bearing is arranged on adjusting washer (disk), delivery pipe is between upper shell and pump discharge pipe, the delivery pipe joint is provided with the delivery pipe seal ring, and the one-level guide ring is fixed by retaining screw and upper shell, and upper shell is formed with single diversion chamber.

The beneficial effects of the utility model are: low temperature immersed pump described in the utility model, by improving the mode that has reduced by a diversion chamber in flow passage structure, can be when pump turn round, the media flow distance is dwindled, and removes a guide ring, form the two stage pump structure of a single diversion chamber, can reduce resistance of medium, reduce vibration, alleviate complete machine weight, cost-saving, the overall efficiency of raising pump.

The accompanying drawing explanation

Fig. 1 is the utility model structural representation

Fig. 2 is that the utility model lower shell body is connected partial schematic diagram with upper shell

Fig. 3 is the utility model schematic perspective view

In figure: 1, filter cap, 2, inducer, 3, lower shell body, 4-1, the one-level impeller, 4-2, sencond stage impeller, 5, the one-level guide ring, 6, upper shell, 7, the secondary guide ring, 8, the bearing guard konisphere, 9, delivery pipe, 10, rotor, 11, motor stator, 12, rotor shaft, 13, the delivery pipe seal ring, 14, the cooling mouth of bearing, 15, pump discharge pipe, 16, the axle head screw, 17, key, 18, connecting bolt, 19, retaining screw, 20, lower lining, 21, lower bearing, 22, upper bearing (metal), 23, adjusting washer (disk), 24,

upper lining

24, 25, single diversion chamber.

Embodiment

Below in conjunction with accompanying drawing, 1-2 is elaborated to the utility model, technological scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiments.Embodiment based in the utility model, those of ordinary skills are not making under the creative work prerequisite the every other embodiment who obtains, and all belong to the scope of the utility model protection:

It is a kind of that the utility model provides the low temperature immersed pump of single diversion chamber, be mainly used in the LNG Liquefied natural gas except liquid oxygen, the conveying of the cryogenic liquides such as LN2, as shown in Figure 1-2: described in the utility model the low temperature immersed pump of single diversion chamber include filter cap 1, inducer 2, lower shell body 3, one-level impeller 4-1, sencond stage impeller 4-2, one-level guide ring 5, upper shell 6, secondary guide ring 7, bearing guard konisphere 8, delivery pipe 9, rotor 10, motor stator 11, rotor shaft 12, delivery pipe seal ring 13, the cooling mouth 14 of bearing, pump discharge pipe 15, axle head screw 16, key 17, connecting bolt 18, retaining screw 19, lower lining 20, lower bearing 21, upper bearing (metal) 22, adjusting washer (disk) 23 and upper lining 24, inducer 2 is fixed on rotor shaft 12 axial regions by axle head screw 16, filter cap 1 is positioned at the entrance point of lower shell body 3, lower shell body 3 is fixing by connecting bolt 18 with upper shell 6, wherein one-level impeller 4-1, sencond stage impeller 4-2 are fixed on rotor shaft 12, on rotor shaft 12, corresponding position is provided with lower bearing 21, upper bearing (metal) 22, lower bearing 21 is provided with bearing guard konisphere 8, upper bearing (metal) 22 is provided with adjusting washer (disk) 23, the cooling mouth 14 of bearing is arranged on adjusting washer (disk) 23, and delivery pipe 9 is between upper shell 6 and pump discharge pipe 15, and delivery pipe 9 joints are provided with delivery pipe seal ring 13, one-level guide ring 5 is fixing with upper shell 6 by retaining screw 19, and upper shell 6 is formed with single diversion chamber 25.In accompanying drawing 1-2, dotted line is medium channel.

Working principle: at first whole pump is soaked in to LNG(hereinafter to be referred as medium) complete cooling rear starting electrical machinery in, when rotor shaft 12 runs up, medium is by inducer 2, after entering one-level impeller 4-1, the corresponding space at one-level impeller 4-1 place (hereinafter to be referred as pump chamber 1) produces pressure under the impeller blade effect, medium is under pressure by one-level guide ring 5, single diversion chamber that upper shell 6 forms enters sencond stage impeller 4-2, pressure is continued to increase in the space at sencond stage impeller 4-2 place (hereinafter to be referred as pump chamber 2) under the impeller blade effect, medium directly enters delivery pipe 9 by secondary guide ring 7 under pressure, pump discharge pipe 15 is transported in other process pipelines.

Low temperature immersed pump described in the utility model, remove the second diversion chamber (seeing accompanying drawing 2) identical with single diversion chamber on (pump chamber 2) by improvement, medium is under pressure by one-level guide ring 5, when single diversion chamber that upper shell 6 forms enters sencond stage impeller 4-2, no longer through lower the second diversion chamber, directly enter delivery pipe 9, pump discharge pipe 15, make resistance of medium reduce, media flow is more unobstructed, improves the overall efficiency of pump.

Above-mentioned explanation, make professional and technical personnel in the field can realize or use the utility model.Therefore, the utility model will can not be restricted to shown in this article these and implement, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims

1. the low temperature immersed pump of a single diversion chamber, is characterized in that: comprise filter cap (1), inducer (2), lower shell body (3), one-level impeller (4-1), sencond stage impeller (4-2), one-level guide ring (5), upper shell (6), secondary guide ring (7), bearing guard konisphere (8), delivery pipe (9), rotor (10), motor stator (11), rotor shaft (12), delivery pipe seal ring (13), the cooling mouth of bearing (14), pump discharge pipe (15), axle head screw (16), key (17), connecting bolt (18), retaining screw (19), lower lining (20), lower bearing (21), upper bearing (metal) (22), adjusting washer (disk) (23) and upper lining (24), in delivery pipe (9), it is medium channel, inducer (2) is fixed on rotor shaft (12) axial region by axle head screw (16), filter cap (1) is positioned at the entrance point of lower shell body (3), lower shell body (3) is fixing by connecting bolt (18) with upper shell (6), one-level impeller (4-1), it is upper that sencond stage impeller (4-2) is fixed on rotor shaft (12), and the upper corresponding position of rotor shaft (12) is provided with lower bearing (21), upper bearing (metal) (22), lower bearing (21) is provided with bearing guard konisphere (8), upper bearing (metal) (22) is provided with adjusting washer (disk) (23), the cooling mouth of bearing (14) is arranged on adjusting washer (disk) (23), delivery pipe (9) is positioned between upper shell (6) and pump discharge pipe (15), delivery pipe (9) joint is provided with delivery pipe seal ring (13), and one-level guide ring (5) is fixing by retaining screw (19) and upper shell (6), and upper shell (6) is formed with single diversion chamber (25).