CN203770083U - Device for preventing cryogenic liquid pump transmission shaft from being frozen - Google Patents
Device for preventing cryogenic liquid pump transmission shaft from being frozen Download PDFInfo
- Publication number
- CN203770083U CN203770083U CN201320879511.6U CN201320879511U CN203770083U CN 203770083 U CN203770083 U CN 203770083U CN 201320879511 U CN201320879511 U CN 201320879511U CN 203770083 U CN203770083 U CN 203770083U
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- Prior art keywords
- pump
- pipeline
- cryogenic liquid
- liquid pump
- gaseous nitrogen
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- Expired - Fee Related
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses a device for preventing a cryogenic liquid pump transmission shaft from being frozen. The device is characterized in that waste gaseous nitrogen which is generated by an air separating device is used as air blow-down air source by utilizing stable drying characteristic of the waste gaseous nitrogen, one waste gaseous nitrogen pipeline is drawn out from waste gaseous nitrogen pipelines of the air separating device for being used as an air blow-down main pipe, blow-down branch pipes in corresponding amount are then allocated according to a scene requirement, a position, which is easily frozen, of a cryogenic liquid pump is blown down by utilizing pressure in an existing waste gaseous nitrogen pipeline, water in air nearby a cold box end surface of the cryogenic liquid pump transmission shaft is taken away, and thus frost is prevented from being formed into refrigerating capacity which is leaked from the cold box end surface is prevented from being in contact with the water; the air blow-down main pipe and the blow-down branch pipes are both provided with valves, and flow of the waste gaseous nitrogen gas can be adjusted according to an actual requirement.
Description
Technical field
The utility model belongs to air separation technology field, relates in particular to the cryogenic liquid pump in air separation equipment oxygen unit.
Background technique
Cryogenic liquid pump mainly comprises reciprocating cryogenic liquid pump and centrifugal cryogenic liquid pump, divides in technology and uses extensively at sky, acts on most important.What in making oxygen by air separation technique, cryogenic liquid pump was carried is temperature at the cryogenic liquide of-183 DEG C to-200 DEG C, require it in course of conveying, to keep low temperature, reduce cold damage as far as possible, otherwise cryogenic liquid pump can be due to the gasification of cryogenic liquide cisco unity malfunction, therefore the cold insulation of itself and external environment requires high.As shown in Figure 1, the general pump housing 1 is all arranged in pearlife insulation ice chest, is connected with extraneous housing and motor 2 by transmission shaft 3; Because ice chest internal-external temperature difference is very large, although the seal arrangement of pump can prevent the leakage of cryogenic liquide or cold, but cold still more or less (according to sealing state) reach axial end outside cold box plate 4 one week by pump shaft 3, moisture in ambient air contacts with it and condenses into frost, if cold reveals serious or wet weather is rainy, will outside ice chest, form layers of ice 5 in whole axle 3 surfaces.After cryogenic liquid pump long-play, ice is more long-pending thicker, the easily rotation of clamping stagnation pump shaft, especially for centrifugal cryogenic liquid pump, because the rotating speed of axle is faster, layers of ice more easily causes pump running jam, so that motor load rises, occur jumping pump accident, even motor damage, affects operation and the safety of whole oxygen unit.Addressing the above problem at present the mode generally adopting is to use stand by pump alternation, and the pump of outage state is heated to defrosting; But switching of pump can not be very frequent, occur can not processing in time while freezing at pump shaft, make pump shaft running for a long time under ice sheet jam state, cause the minimizing in working life of pump even to damage pump.
Model utility content
For overcoming problems of the prior art, the utility model provides a kind of device that prevents that cryogenic liquid pump pump shaft from freezing.
For solving the problems of the technologies described above, the utility model provides a kind of device that prevents that cryogenic liquide pump drive shaft from freezing, described device comprises the dirty gas source nitrogen pipeline of selecting successively nearby, draw the master control valve on Yi road house steward and house steward from described pipeline, the one or more blowing pipeline that leads to cryogenic liquid pump of drawing respectively from described house steward, and uncovered blowing short tube after control valve on described blowing pipeline and valve; Utilize the dirty gas nitrogen in dirty gas nitrogen pipe road, each cryogenic liquide pump shaft is easily frozen and locates to blow down, take away near the airborne moisture of pump shaft ice chest end face, contact with it formation frost thereby stop from the cold of ice chest face leakage.
The utility model design philosophy is as follows.
The icing reason of cryogenic liquide pump drive shaft is that cold inevitably transmits out by pump shaft, contacts form ice with humid air.Therefore, if the outer pump shaft ambient air of ice chest is kept dry, just can be from preventing that to a great extent pump shaft surface from freezing.The method that the utility model adopts is to adopt a covering device from the dirty gas nitrogen pipe road of air separation facility, to draw dirty gas nitrogen as blowing down source of the gas, utilize the pressure in existing dirty gas nitrogen pipe road, according to field demand, each cryogenic liquide pump shaft is easily frozen and locates to blow down, take away near the airborne moisture of pump shaft ice chest end face, contact with it formation frost thereby stop from the cold of ice chest face leakage.
Selecting dirty gas nitrogen to be used as blowing source of the gas is mainly because its dry stable characteristic, the nitrogen content of dirty gas nitrogen is generally 94%, dew point is below-75 DEG C, relative moisture is in 30% left and right, be used for the pump shaft of High Rotation Speed to blow down the moisture that can not only take away in surrounding atmosphere, and can guarantee Security; Secondly, dirty gas nitrogen is mainly used as molecular sieve adsorber regeneration source of the gas and water-cooling tower heat exchange source of the gas in space division technique, enters atmosphere after use, and rich dirty gas nitrogen also can directly be discharged into atmosphere, therefore using dirty gas nitrogen to do and blow down almost user cost useless of source of the gas, is exhaust gas utilization.Therefore, utilize the dry characteristic of dirty gas nitrogen that the moisture evaporation compared with in humid air is taken away, prevent that pump shaft from freezing is a kind of method of simple and energy-conserving and environment-protective.
The device that the utility model adopts is that the dirty gas source nitrogen pipeline from selecting is nearby drawn a road house steward, on house steward, dispose master control valve, according to on-the-spot needs, draw respectively one or more blowing pipeline from described house steward again and lead to each cryogenic liquid pump, at every blowing pipeline proximal end place, control valve is all installed, after valve, be equipped with the blowing short tube that a joint is uncovered, in the time of valve open, dirty gas nitrogen can easily freeze and locate to blow down facing to cryogenic liquide pump drive shaft.
Utilize device described in the utility model, can be according to the real-world operation situation of pump and frosting state, and the changing condition of weather environment, by the aperture of regulating valve, adjust in time dirty gas nitrogen flow, reach the icing object of prevention pump shaft.
For convenience of being suitable for, blowing down pipeline described in the utility model device the instrument supply gas pipeline that can adopt DN6mm～DN12mm.
Have the following advantages for solving the method and apparatus that cryogenic liquide pump drive shaft freezes above:
1. simple, applicability is extensive, is applicable to the cryogenic liquid pump at various scenes;
2. safe and practical, effect is remarkable, concerning the pump shaft of High Rotation Speed, dirty gas nitrogen stable performance and dry, ensureing under the prerequisite of safe handling, effectively preventing spreading of transmission shaft surface layers of ice, on producing, ensureing the stable and Security of oxygen unit operation.
3. with low cost, energy-conserving and environment-protective, material requested is convenient easily to be got, and only need, at fixed equipments such as some pipelines of early investment and valves, almost there is no thereafter operating cost, do not need extra power and energy, and the dirty gas nitrogen that enters atmosphere is without any pollution.
Brief description of the drawings
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
The icing schematic diagram in Fig. 1 cryogenic liquid pump ice chest outer pump shaft end face and surface
Fig. 2 the utility model blowing-down device duct arrangement schematic diagram
Wherein: 1 cryogenic liquid pump body; 2 cryogenic liquid pump external motor; 3 pump drive shafts (being called for short: pump shaft); 4 cold box plates; 5 frosting layers of ices; The dirty gas nitrogen pipe of 6 existing DN50 road; 7 DN12 that newly establish blow down house steward; 8 blow down the DN12 master control valve on house steward; 9 DN12 that newly establish blow down arm; DN12 control valve on 10 arms; 11 blow down short tube.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
The utility model is taking centrifugal cryogenic liquid pump as example, and as shown in Figure 1, the pump housing 1, in ice chest, is connected with the motor 2 outside ice chest by passing shaft 3; Cold is delivered to outside ice chest through cold box plate 4 along pump shaft 3, in the 3 end frostings of ice chest outer pump shaft, after operation a period of time, forms layers of ice 5 on pump shaft 3 surfaces.For addressing the above problem, the utility model utilizes the dirty gas nitrogen of the by-product of air separation facility to blow down pump shaft 3, prevents the formation of layers of ice 5.
The utility model embodiment comprises blowing-down device duct arrangement and two aspects of regular job adjustment.Blowing-down device duct arrangement comprises: 1, selecting dirty gas nitrogen pipe road access port the most nearby apart from pump shaft; 2, configuring pipes material can be selected the instrument supply gas pipeline of DN6～DN12, need to set up one or more flow control valves according to scene; 3, as shown in Figure 2, blowing assembling pipe joint in the present embodiment comprises: the pipeline 7 that picks out a DN12 from dirty gas nitrogen pipe road 6 upper sheds of existing DN50 is as blowing down house steward, blowing down the control main valve 8 of setting up DN12 on house steward 7, the blowing arm 9 of drawing two DN12 from blowing down house steward 7 is configured to two pumps motor 2, the front DN12 control valve 10 arranging respectively before pump of two pumps motor 2 on blowing arm 9, at control valve 10, the rear uncovered DN12 of a joint that respectively connects blows down short tube 11, the blowing mouth that blows down short tube 11 place that easily freezes along ice chest exterior edge face facing to pump shaft.After blowing-down device assembling has purged, when use, open and control main valve 8, dirty gas nitrogen is assigned in two blowing arms 9 by blowing down house steward 7, according to field condition, open the also aperture of adjusting control valve 10, dirty gas nitrogen easily freezes and locates to blow down pump shaft by blowing down short tube 11, prevents that it from freezing.
Regular job adjustment comprises: 1, observe real-world operation situation and the frosting situation of pump, adjust dirty gas nitrogen flow; 2,, through tracing observation after a while, determine that dirty gas nitrogen blows down uninterrupted scope; 3,, when weather environment changes, adjust and blow down flow.
Claims (3)
1. a device that prevents that cryogenic liquide pump drive shaft from freezing, described device comprises the dirty gas source nitrogen pipeline of selecting successively nearby, draw the master control valve on Yi road house steward and house steward from described pipeline, the one or more blowing pipeline that leads to cryogenic liquid pump of drawing respectively from described house steward, and uncovered blowing short tube after control valve on described blowing pipeline and valve; Utilize the dirty gas nitrogen in dirty gas nitrogen pipe road, each cryogenic liquide pump shaft is easily frozen and locates to blow down, take away near the airborne moisture of pump shaft ice chest end face, contact with it formation frost thereby stop from the cold of ice chest face leakage.
2. the device that prevents that cryogenic liquide pump drive shaft from freezing according to claim 1, is characterized in that: can be according to on-the-spot actual demand, by regulating the aperture of above-mentioned each control valve to adjust dirty gas nitrogen flow.
3. the device that prevents that cryogenic liquide pump drive shaft from freezing according to claim 1, is characterized in that: described blowing pipeline can adopt the instrument supply gas pipeline of DN6mm～DN12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879511.6U CN203770083U (en) | 2013-12-30 | 2013-12-30 | Device for preventing cryogenic liquid pump transmission shaft from being frozen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879511.6U CN203770083U (en) | 2013-12-30 | 2013-12-30 | Device for preventing cryogenic liquid pump transmission shaft from being frozen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203770083U true CN203770083U (en) | 2014-08-13 |
Family
ID=51287280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320879511.6U Expired - Fee Related CN203770083U (en) | 2013-12-30 | 2013-12-30 | Device for preventing cryogenic liquid pump transmission shaft from being frozen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203770083U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711678A (en) * | 2013-12-30 | 2014-04-09 | 马钢(集团)控股有限公司 | Method and device for preventing transmission shaft of cryogenic liquid pump from being frozen |
-
2013
- 2013-12-30 CN CN201320879511.6U patent/CN203770083U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711678A (en) * | 2013-12-30 | 2014-04-09 | 马钢(集团)控股有限公司 | Method and device for preventing transmission shaft of cryogenic liquid pump from being frozen |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20211230 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |