CN2387377Y - Two-stage boosting zero-pressure low temp liquid pump - Google Patents
Two-stage boosting zero-pressure low temp liquid pump Download PDFInfo
- Publication number
- CN2387377Y CN2387377Y CN 99232394 CN99232394U CN2387377Y CN 2387377 Y CN2387377 Y CN 2387377Y CN 99232394 CN99232394 CN 99232394 CN 99232394 U CN99232394 U CN 99232394U CN 2387377 Y CN2387377 Y CN 2387377Y
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Abstract
The utility model relates to a low-temperature liquid pump of a two-stage self-boosting zero-pressure type, which comprises a pump casing and a cylinder body, wherein the cylinder body is composed of a first-stage piston type cylinder body and a second-stage piston type cylinder body which are arranged in a coaxial mode and are rigidly connected together with a general piston rod, the first-stage cylinder is provided with two feeding passages which are positioned above the central line of a plunger piston, and an overflow valve and a liquid discharge valve are arranged on a discharge pipeline of the first-stage cylinder body. A compressed gas accumulator with a large volume is arranged on a liquid inflow pipeline of the second-stage cylinder body, and a second-stage feeding valve is arranged between a compression cavity and a feeding accumulator of the second-stage cylinder body. A second-stage liquid discharge value is arranged between the compression cavity and a second-stage liquid discharge pipe of the second-stage cylinder body, and the liquid discharge valve of the first-stage cylinder body is connected between the first-stage overflow valve and the second-stage feeding valve.
Description
The utility model relates to various cryogenic liquides such as being used for liquid oxygen, liquid nitrogen, liquid argon loading and unloading, transhipment, carry and fill the cryogenic liquid pump of bottle operation.
The various cryogenic liquid pumps that use mostly are the single stage piston pumps at present.Because it has the cause of the feed liquor valve of Returnning spring, they all have a minimum requirement to its inlet hydraulic value.When inlet hydraulic is not enough, tend to cause pump not work reliably.For guaranteeing to satisfy the requirement of its inlet hydraulic, present way is the vaporizer that improves the setting height(from bottom) of cryogenic tank or has been equipped with pressurization, and the manufacture cost of this just feasible and cryogenic tank that cryopump is supporting and the operating cost of cryopump are all very high.Particularly when the liquid air separation plant needed reciprocating pump directly externally to fill bottle, because the characteristics of air separation plant self often can not provide its necessary inlet hydraulic to reciprocating pump, this had just brought very big difficulty to the process organization of liquid air separation plant.
The purpose of this utility model is the above-mentioned shortcoming that overcomes prior art, and providing a kind of does not have the pressure head requirement to cryogenic tank, and operating conditions requires low, and the high secondary of reliability increases a zero-pressure cryogenic liquid pump certainly.
The purpose of this utility model adopts the plunger type cylinder body to serve as first order compression, piston type cylinder body and serves as the second level and compress this technological scheme and realize.Its concrete formation comprises pump case and the cylinder block that is located in the pump case, described cylinder block is made of jointly the one-level cylinder block and the two stage cylinder body of coaxial setting, wherein, the one-level cylinder block is a plunger type, the two stage cylinder body is a piston type, one-level plunger and second piston are with being rigidly connected with a total piston rod, described one-level cylinder block has two feeding-passages, its position at the plunger center line with the upper part, the discharge conduit of one-level cylinder block is provided with a relief valve and a liquid discharging valve, on the feed liquor pipeline of described two stage cylinder body, be provided with the pressurized gas accumulator of a big volume, between the compression chamber of two stage cylinder body and charging accumulator, be provided with a secondary feeding valve, be provided with a secondary liquid discharging valve between the compression chamber of two stage cylinder body and secondary liquid-discharging tube, the liquid discharging valve of described one-level cylinder block is connected between one-level relief valve and the secondary feeding valve.
Working principle of the present utility model is as follows:
One-level plunger and second piston constitute a rigidity composite component, under the driving of total piston rod with reciprocating.Because one-level is a plunger type, has cancelled the feed liquor valve, has not also just had the resistance of its Returnning spring, and plunger pump can produce sliding friction heat hardly, thereby help subtracting the vaporization that goes on foot residual liquid in the compression chamber, avoid the generation of its steam thrust to a great extent, thereby realize a zero-pressure feed liquor; The liquid of being discharged by the compression of plunger type one-level has certain pressure, and the inlet hydraulic that compresses for stage piston-type requires to provide assurance; Two one-level feeding-passages that are positioned at the above position of plunger center line make the liquid that enters the one-level compression chamber can not withdraw from compression chamber fully, thereby have guaranteed the capacity rating of secondary; The pressurized gas accumulator that is located at the big volume on the secondary input duct has the effect that prolongs two level liquid time and balanced secondary inlet hydraulic; The above each point is achieved the proper functioning of this secondary formula cryogenic liquid pump.
The utility model advantage compared with prior art is the principle advanced person, structure is ingenious rationally, the compression of one-level plunger has been avoided the generation of steam thrust and has not been had the Returnning spring resistance of feed liquor valve, guaranteed the possibility of a zero-pressure feed liquor, thereby reduced manufacturing, installation requirement, reduced the manufacture cost of hopper and the operating cost of pump the cryogenic tank supporting with it.Being particularly suitable for being used in the liquid air separation plant uses when directly externally filling bottle operation.
Provide embodiment below in conjunction with accompanying drawing.
Fig. 1 structural representation of the present utility model
As shown in Figure 1, one-level cylinder block 20 and two stage cylinder body 12 connect into a rigid construction through bolt 23, are installed in the pump case 13.Total piston rod 1 and one-level plunger 2, second piston 3 are a rigidity composite component, and they do the to-and-fro motion of left and right directions together under the driving of crank-connecting rod (not shown).For guaranteeing that secondary has specified discharge capacity, and don't " taking blame for others " takes place, the area of one-level plunger can be designed to greater than theoretical value.Two feeding-passages 21,22 of one-level cylinder block are located at the above position of plunger center line.When one-level plunger 2 moved right its mid point, the one-level feeding-passage began open-minded, from feed liquid spirt one-level compression chamber under the effect of compression chamber external and internal pressure difference of cryogenic tank.The discharge conduit of one-level cylinder block is provided with a relief valve 4 and a liquid discharging valve 5; On the feed liquor pipeline of two stage cylinder body, be provided with the pressurized gas accumulator 6 of a big volume.Secondary feeding valve 7 is located between the compression chamber and charging accumulator 6 of one-level cylinder block.Secondary liquid discharging valve 9 is located between secondary compression chamber and the secondary liquid-discharging tube 10.Liquid discharging valve 5 is connected between one-level relief valve 4 and the secondary feeding valve 7.8 is secondary charging and discharging holes among the figure, and 11 is filter, 24 liquid entering holes for the pump that joins with cryogenic tank.
Pump case 13 can be made as a vacuum insulation formula pump case, help keeping the Subcoold temperature of feed liquid and avoid the vaporization.
Claims (2)
1, a kind of secondary is from a supercharging zero-pressure cryogenic liquid pump, comprise pump case and the cylinder block that is located in the pump case, it is characterized in that described cylinder block is made of jointly the one-level cylinder block and the two stage cylinder body of coaxial setting, wherein, the one-level cylinder block is a plunger type, the two stage cylinder body is a piston type, one-level plunger and second piston are with being rigidly connected with a total piston rod, described one-level cylinder block has two feeding-passages, its position at the plunger center line with the upper part, the discharge conduit of one-level cylinder block is provided with a relief valve and a liquid discharging valve, on the feed liquor pipeline of described two stage cylinder body, be provided with the pressurized gas accumulator of a big volume, between the compression chamber of two stage cylinder body and charging accumulator, be provided with a secondary feeding valve, be provided with a secondary liquid discharging valve between the compression chamber of two stage cylinder body and secondary liquid-discharging tube, the liquid discharging valve of described one-level cylinder block is connected between one-level stream valve and the secondary feeding valve.
2, secondary as claimed in claim 1 is characterized in that from a supercharging zero-pressure cryogenic liquid pump described pump case is a vacuum insulation formula pump case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99232394 CN2387377Y (en) | 1999-08-20 | 1999-08-20 | Two-stage boosting zero-pressure low temp liquid pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99232394 CN2387377Y (en) | 1999-08-20 | 1999-08-20 | Two-stage boosting zero-pressure low temp liquid pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2387377Y true CN2387377Y (en) | 2000-07-12 |
Family
ID=34021085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99232394 Expired - Fee Related CN2387377Y (en) | 1999-08-20 | 1999-08-20 | Two-stage boosting zero-pressure low temp liquid pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2387377Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107407262A (en) * | 2015-03-25 | 2017-11-28 | 卡特彼勒公司 | Twin-stage cryogenic pump |
| CN109404273A (en) * | 2018-10-19 | 2019-03-01 | 湖州三井低温设备有限公司 | A kind of high pressure low temperature reciprocating pump cold end |
-
1999
- 1999-08-20 CN CN 99232394 patent/CN2387377Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107407262A (en) * | 2015-03-25 | 2017-11-28 | 卡特彼勒公司 | Twin-stage cryogenic pump |
| CN109404273A (en) * | 2018-10-19 | 2019-03-01 | 湖州三井低温设备有限公司 | A kind of high pressure low temperature reciprocating pump cold end |
| CN109404273B (en) * | 2018-10-19 | 2024-02-09 | 湖州三井低温设备有限公司 | Cold end of high-pressure low-temperature reciprocating pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |