CN204610305U - Latent liquid type low-temperature centrifugal pump - Google Patents
Latent liquid type low-temperature centrifugal pump Download PDFInfo
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- CN204610305U CN204610305U CN201520324709.7U CN201520324709U CN204610305U CN 204610305 U CN204610305 U CN 204610305U CN 201520324709 U CN201520324709 U CN 201520324709U CN 204610305 U CN204610305 U CN 204610305U
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Abstract
The utility model belongs to centrifugal pump field, be specifically related to a kind of latent liquid type low-temperature centrifugal pump, comprise pump case, rotor, central shaft, inducer, one stage impeller, one-level stator, axle sleeve, impeller and final stage stator, pump case comprises the suction casing connected in turn from bottom to top, stage casing, lower end cap, motor casing and upper end cap, upper end cap adopts integrally casting shaping, on, lower end cap is communicated with by least 4 drain pipes, each runner in upper end cap and the cross section of liquid outlet channel are circular and the joint of each runner and liquid outlet channel adopts rounding off, the bottom of suction casing is oviduct, inner circumference along suction casing oviduct is evenly equipped with 2 ~ 6 guide plates, suction screen is installed in the suction side of oviduct, motor casing upper, bottom has exhaust port, one stage impeller, the Spielpassung position of impeller and axle sleeve all has triangle maze trough.The flow losses of the cryogenic liquide of this latent liquid type low-temperature centrifugal pump are little, dielectric leakage is few, and the suction efficiency of the pump housing is high.
Description
Technical field
The utility model relates to a kind of latent liquid type low-temperature centrifugal pump, belongs to centrifugal pump field.
Background technique
The cryogenic liquide such as liquid nitrogen, LNG Liquefied natural gas has low temperature (under barometric pressure, liquid nitrogen is-196 DEG C, LNG Liquefied natural gas is-162 DEG C), dangerous, the easy feature such as vaporization, higher to the requirement of pump during its conveying: pump need low temperature resistant, shaft seal should should be tried one's best little etc. without dielectric leakage, the cold damage of system.Existing pump mostly is land pump form (pump is placed in air), and the cold damage of system is comparatively large, and Pump Shaft Seal is difficult in maintenance, easily dielectric leakage occurs, and reliability is not high.
Model utility content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: loss is little, dielectric leakage is few and the latent liquid type low-temperature centrifugal pump that suction efficiency is high to provide a kind of cryogenic liquide to flow.
Latent liquid type low-temperature centrifugal pump described in the utility model, comprise pump case, rotor, central shaft, inducer, one stage impeller, one-level stator, axle sleeve, impeller and final stage stator, pump case comprises the suction casing connected in turn from bottom to top, stage casing, lower end cap, motor casing and upper end cap, upper end cap adopts integrally casting shaping, on, lower end cap is communicated with by least 4 drain pipes, each runner in upper end cap and the cross section of liquid outlet channel are circular and the joint of each runner and liquid outlet channel adopts rounding off, the bottom of suction casing is oviduct, inner circumference along suction casing oviduct is evenly equipped with 2 ~ 6 guide plates, suction screen is installed in the suction side of oviduct, motor casing upper, bottom has exhaust port, one stage impeller coordinates with suction casing, impeller and stage casing coordinate and one-level stator is Spielpassung with coordinating of axle sleeve, one stage impeller, the Spielpassung position of impeller and axle sleeve all has triangle maze trough.
In the utility model: upper and lower end cap is communicated with by least 4 drain pipes, make that cryogenic liquide flow velocity in pump is lower, loss is less; The above-mentioned unique texture of upper end cap can make that cryogenic liquide is smooth gently flows through upper end cap, and flow losses are little, efficiency is high; Guide plate uniform in the oviduct of suction casing bottom, smooth and easy without eddy current when liquid can be made to enter, improve the suction performance of pump; The exhaust port of the upper and lower part of motor casing, can ensure that in pump and motor, accumulation or the gas because of cryogenic liquid vaporizer generation can be discharged rapidly; The triangle maze trough that the Spielpassung position of one stage impeller, impeller and axle sleeve has, can reduce the internal leakage of medium, improves the efficiency of pump.
Working principle and process:
In this latent liquid type low-temperature centrifugal pump, Pump and Electromotor coaxially forms, the cryogenic liquide such as liquid nitrogen, LNG Liquefied natural gas is utilized to have dielectric feature (liquid can enter motor internal), without the need to arranging shaft seal between Pump and Electromotor, cryogenic liquide sucks from the suction casing of lower end, and enter upper end cap by drain pipe, finally through each runner of upper end cap collect liquid outlet channel backward on spue.Be placed in seal container (claiming " pump pond ") during use, slip in liquid, can guarantee that No leakage runs, Security is good, it also avoid dielectric loss, is convenient to quick startup simultaneously.And seal container is convenient to take cold insulation measure, and the cold damage of system is little.
Preferably, inducer adopts the spiral-shaped structure of uniform pitch, and cavitation performance is good, can produce lift again, increases one stage impeller inlet pressure.
Preferably, the thermal expansion coefficient of upper and lower end cap material therefor is greater than drain pipe material therefor, guarantees the tightness that part connects under worst cold case, avoids leak of liquid.
Preferably, the thermal expansion coefficient of inducer, each material used for impeller is greater than central shaft material therefor, and under guaranteeing worst cold case, part coordinates more fastening, improves operation stability.
The beneficial effect that the utility model is compared with prior art had is:
In this latent liquid type low-temperature centrifugal pump, upper and lower end cap is communicated with by many drain pipes, makes that cryogenic liquide flow velocity in pump is lower, loss is less; Cryogenic liquide smoothly gently can flow through upper end cap, and flow losses are little, efficiency is high; Smooth and easy without eddy current when guide plate in suction casing oviduct can make liquid enter, improve the suction performance of pump; The triangle maze trough that the Spielpassung position of one stage impeller, impeller and axle sleeve has, reduces the internal leakage of medium, improves the efficiency of pump.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is A-A sectional drawing in Fig. 1.
In figure: 1, suction screen; 2, oviduct; 3, suction casing; 4, stage casing; 5, lower end cap; 6, exhaust port; 7, motor casing; 8, drain pipe; 9, upper end cap; 10, runner; 11, liquid outlet channel; 12, central shaft; 13, rotor; 14, final stage stator; 15, impeller; 16, triangle maze trough; 17, axle sleeve; 18, one-level stator; 19, one stage impeller; 20, inducer; 21, axle head screw; 22, guide plate.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
As Fig. 1, shown in 2, this latent liquid type low-temperature centrifugal pump comprises pump case, rotor 13, central shaft 12 and the inducer 20 be fastened on by axle head screw 21 on central shaft 12, one stage impeller 19, one-level stator 18, axle sleeve 17, impeller 15, final stage stator 14, pump case comprises the suction casing 3 connected in turn from bottom to top, stage casing 4, lower end cap 5, motor casing 7 and upper end cap 9, upper end cap 9 adopts integrally casting shaping, on, lower end cap is communicated with by least 4 drain pipes 8, each runner 10 in upper end cap 9 and the cross section of liquid outlet channel 11 are circular and each runner 10 and adopt rounding off with the joint of liquid outlet channel 11, the bottom of suction casing 3 is oviduct 2, inner circumference along suction casing oviduct 2 is evenly equipped with 2 ~ 6 guide plates 22 (adopting 4 guide plates 22 in the present embodiment), suction screen 1 is installed in the suction side of oviduct 2, motor casing 7 upper, bottom has exhaust port 6, and one stage impeller 19 coordinates with suction casing 3, impeller 15 and stage casing 4 coordinate and one-level stator 18 is Spielpassung with coordinating of axle sleeve 17, one stage impeller 19, the Spielpassung position of impeller 15 and axle sleeve 17 all has triangle maze trough 16.
In the present embodiment, upper and lower end cap is communicated with by least 4 drain pipes 8, makes that cryogenic liquide flow velocity in pump is lower, loss is less; The above-mentioned unique texture of upper end cap 9 can make that cryogenic liquide is smooth gently flows through upper end cap 9, and flow losses are little, efficiency is high; Guide plate 22 uniform in the oviduct 2 of suction casing 3 bottom, smooth and easy without eddy current when liquid can be made to enter, improve the suction performance of pump; The exhaust port 6 of the upper and lower part of motor casing 7, can ensure that in pump and motor, accumulation or the gas because of cryogenic liquid vaporizer generation can be discharged rapidly; The triangle maze trough 16 that the Spielpassung position of one stage impeller 19, impeller 15 and axle sleeve 17 has, can reduce the internal leakage of medium, improves the efficiency of pump.
Above-mentioned inducer 20 adopts the spiral-shaped structure of uniform pitch, and cavitation performance is good, can produce lift again, increases one stage impeller 19 inlet pressure; The thermal expansion coefficient of upper and lower end cap material therefor is greater than drain pipe 8 material therefor, guarantees the tightness that part connects under worst cold case, avoids leak of liquid; The thermal expansion coefficient of inducer 20, each material used for impeller is greater than central shaft 12 material therefor, and under guaranteeing worst cold case, part coordinates more fastening, improves operation stability.
In this latent liquid type low-temperature centrifugal pump, Pump and Electromotor coaxially forms, the cryogenic liquide such as liquid nitrogen, LNG Liquefied natural gas is utilized to have dielectric feature (liquid can enter motor internal), without the need to arranging shaft seal between Pump and Electromotor, cryogenic liquide sucks from the suction casing 3 of lower end, and enter upper end cap 9 by drain pipe 8, finally through each runner of upper end cap 9 10 collect liquid outlet channel 11 backward on spue.Be placed in seal container (claiming " pump pond ") during use, slip in liquid, can guarantee that No leakage runs, Security is good, it also avoid dielectric loss, is convenient to quick startup simultaneously.And seal container is convenient to take cold insulation measure, and the cold damage of system is little.
Claims (4)
1. a latent liquid type low-temperature centrifugal pump, comprise pump case, rotor (13), central shaft (12), inducer (20), one stage impeller (19), one-level stator (18), axle sleeve (17), impeller (15) and final stage stator (14), it is characterized in that: pump case comprises the suction casing (3) connected in turn from bottom to top, stage casing (4), lower end cap (5), motor casing (7) and upper end cap (9), upper end cap (9) adopts integrally casting shaping, on, lower end cap is communicated with by least 4 drain pipes (8), each runner (10) in upper end cap (9) and the cross section of liquid outlet channel (11) are circular and each runner (10) adopts rounding off with the joint of liquid outlet channel (11), the bottom of suction casing (3) is oviduct (2), inner circumference along suction casing oviduct (2) is evenly equipped with 2 ~ 6 guide plates (22), suction screen (1) is installed in the suction side of oviduct (2), motor casing (7) upper, bottom has exhaust port (6), one stage impeller (19) coordinates with suction casing (3), impeller (15) and stage casing (4) coordinate and one-level stator (18) is Spielpassung with coordinating of axle sleeve (17), one stage impeller (19), the Spielpassung position of impeller (15) and axle sleeve (17) all has triangle maze trough (16).
2. latent liquid type low-temperature centrifugal pump according to claim 1, is characterized in that: described inducer (20) adopts the spiral-shaped structure of uniform pitch.
3. latent liquid type low-temperature centrifugal pump according to claim 1 and 2, is characterized in that: the thermal expansion coefficient of described upper and lower end cap material therefor is greater than drain pipe (8) material therefor.
4. latent liquid type low-temperature centrifugal pump according to claim 1 and 2, is characterized in that: described inducer (20), the thermal expansion coefficient of each material used for impeller are greater than central shaft (12) material therefor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520324709.7U CN204610305U (en) | 2015-05-19 | 2015-05-19 | Latent liquid type low-temperature centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520324709.7U CN204610305U (en) | 2015-05-19 | 2015-05-19 | Latent liquid type low-temperature centrifugal pump |
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| Publication Number | Publication Date |
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| CN204610305U true CN204610305U (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520324709.7U Active CN204610305U (en) | 2015-05-19 | 2015-05-19 | Latent liquid type low-temperature centrifugal pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681822A (en) * | 2017-09-25 | 2018-02-09 | 湖南大学 | Efficient cryogenic motor for latent liquid type LNG pump |
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2015
- 2015-05-19 CN CN201520324709.7U patent/CN204610305U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681822A (en) * | 2017-09-25 | 2018-02-09 | 湖南大学 | Efficient cryogenic motor for latent liquid type LNG pump |
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