CN102519543A - Pressure detection device of differential pressure levelmeter for cryogenic liquid storage tank - Google Patents
Pressure detection device of differential pressure levelmeter for cryogenic liquid storage tank Download PDFInfo
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- CN102519543A CN102519543A CN2011104150201A CN201110415020A CN102519543A CN 102519543 A CN102519543 A CN 102519543A CN 2011104150201 A CN2011104150201 A CN 2011104150201A CN 201110415020 A CN201110415020 A CN 201110415020A CN 102519543 A CN102519543 A CN 102519543A
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Abstract
The invention discloses a pressure detection device of a differential pressure levelmeter for a cryogenic liquid storage tank. The device comprises a base having its lower part arranged in the bottom insulating layer of the cryogenic liquid storage tank, a mounting hole is arranged in the base, a damper tube is arranged in the mounting hole, an inclined face is formed at each of two sides of the top of the damper tube, an axial blind hole is arranged at the bottom of the mounting hole in the base, a radial pressure hole is arranged on the sidewall of the bottom of the axial blind hole, a heat conductor is arranged at the bottom of the base, a damping cover for covering the damper tube is arranged on the base, a blind hole with a conical bottom is axially arranged in the damping cover, and plural liquid inlet holes communicated with the blind hole are circumferentially arranged at the bottom of the damping cover. The invention ensures accurate measurement of the level of cryogenic liquid stored in the cryogenic liquid storage tank, is free from the influence of the mounting position of the differential pressure levelmeter, and does no low-temperature harm to levelmeter measurement.
Description
Technical field
The present invention relates to a kind of differential pressure levelmeter, refer more particularly to a kind of pressure obtaning device that is used for the differential pressure levelmeter of cryogenic liquid storage tank.
Background technology
Low-temperature deep liquid is (like LNG, LN
2) storage temperature is generally below-150 ℃; Its hold-up vessel is a double-jacket vacuum insulation storage tank; Most at present employing differential pressure type level gauges carry out level gauging; Its principle of work is: liquid level gauge is gathered the pressure signal of cryogenic tank top gaseous pressure and bottom minimum liquid level point liquid, and (low-pressure cavity is communicated with storage tank top gas-phase space two corrugated tube condensation of water vapor through differential pressure gauge; High pressure chest is communicated with storage tank bottom liquid phases minimum point) measure 2 pressure difference value---be the fluid column static pressure of cryogenic liquid in the storage tank, and be reflected on the liquid level gauge display disc.
Can the pressure guiding device that be communicated with of the high pressure chest of differential pressure levelmeter and storage tank liquid phase minimum liquid level pressure signaling point derive stable, correct pressure signal, for the accurate measurement of cryogenic liquid liquid level in the cryogenic tank, is vital.Conventional pilot connectivity structure; When cryogenic liquid flows out the storage tank heat insulation layer along pressure guiding pipe; After entering is exposed to the liquid phase guiding tube and instrument in the atmosphere, the heat that imports into through the impulse pipeline will make the extremely unsettled gas-liquid coexistence of existence phenomenon in the pipe, and the problem of bringing thus is reflected in two aspects: be the balance that extraneous small inducement all will influence liquid level in the connecting pipe on the one hand; Thereby cause the differential pressure levelmeter liquid level to shake significantly, can't accurately measure the storage tank liquid level; And will form local fluid column static pressure in the liquid entering connecting pipe, the actual fluid column static pressure that storage tank need be measured is carried out balance, so the liquid level height that on differential pressure levelmeter, reflects will not be the true liquid level of storage tank.And the installation site with differential pressure levelmeter changes, and the liquid level of measurement also will change.On the other hand, cold excessively low temperature gas-liquid mixed media gets into liquid level gauge, also can cause indicating card frosting, dewfall, thereby have a strong impact on the correct indication of liquid level gauge pointer.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of liquid level indication to stablize, be used for accurately the pressure obtaning device of the differential pressure levelmeter of cryogenic liquid storage tank.
For addressing the above problem; The technical scheme that the present invention adopts is: be used for the pressure obtaning device of the differential pressure levelmeter of cryogenic liquid storage tank, comprise that the bottom is arranged on the base in the cryogenic liquid storage tank bottom insulation layer, base is provided with mounting hole; Be provided with damper tube in the mounting hole; System one inclined-plane is cut on two sides, damper tube top respectively, and the bottom of mounting hole is provided with axial blind hole on the base, and the sidewall of axial blind hole bottom is provided with radially tracting pressuring hole; The base bottom is provided with heat transfer device; Also be provided with the damping lid that damper tube is covered on the base, axially be provided with the bottom in the damping lid and be conical blind hole, damping lid bottom circumferentially is provided with some inlet openings that are connected with blind hole.
Described heat transfer device is the heat conduction copper wire.
It is 4 that described damping covers the inlet opening quantity that is connected with blind hole, and circumferentially is distributed on damping and covers.
Described base is provided with the installation step that is used to locate the damping lid.
The blind hole bottom that radially is provided with in the described damping lid is 90 ° of circular cones.
One 45 ° of inclined-planes of system are cut on two sides, described damper tube top respectively.
The invention has the beneficial effects as follows: adopted full gasification pressure vessel device; Be installed in storage tank liquid phase liquid level signal pressure point; Guarantee that the medium that gets in the liquid level gauge liquid phase guiding tube is single-phase stabilizing gas, the fluid pressure force signal can be delivered to through stable gas column in the differential pressure levelmeter air cavity, thereby guarantees to store in the cryogenic liquid storage tank the accurate measurement of cryogenic liquid liquid level; And do not receive the influence of differential pressure levelmeter installation site, can not measure yet and form the cryogenic freezing injury liquid level gauge.
Description of drawings
Fig. 1 is the cryogenic liquid tank structure synoptic diagram that pressure obtaning device of the present invention and differential pressure levelmeter are installed;
Among Fig. 1: 1. base, 2. damper tube, 3. axial blind hole, 4. tracting pressuring hole radially; 5. heat transfer device, 6. damping lid, 7. blind hole, 8. inlet opening; 9. installation step, 10. cryogenic liquid storage tank, 11. insulation courses, 12. differential pressure levelmeters; 13. meteorological pressure guiding pipe, 14. liquid phase pressure guiding pipes, 15. storage tank gas-phase spaces.
Embodiment
Below in conjunction with accompanying drawing, structure of the present invention is done further to describe in detail.
As shown in Figure 1, be used for the pressure obtaning device of the differential pressure levelmeter of cryogenic liquid storage tank, comprise that the bottom is arranged on the base 1 in cryogenic liquid storage tank 10 bottom insulation layer 11; Base 1 is provided with mounting hole; Be provided with damper tube 2 in the mounting hole, one 45 ° of inclined-planes of system are cut on two sides, damper tube 2 top respectively, and the bottom of mounting hole is provided with axial blind hole 3 on the base 1; The sidewall of axial blind hole 3 bottoms is provided with radially tracting pressuring hole 4, and base 1 bottom is provided with the heat conduction copper wire as heat transfer device 5.Base 1 is provided with the installation step 9 that is used to locate damping lid 6; The installation step 9 of base 1 is provided with the damping lid 6 that damper tube 2 is covered; Axially being provided with the bottom in the damping lid 6 is 90 ° of conical blind holes 7, and damping is covered 6 bottoms and circumferentially is evenly equipped with 4 inlet openings 8 that are connected with blind hole 7.
When installing and using, the meteorological pressure guiding pipe 13 of differential pressure levelmeter 12 is connected to the top of cryogenic liquid tank 10, the liquid phase pressure guiding pipe 14 of differential pressure levelmeter 12 is inserted in the radially tracting pressuring hole 4 that is provided with on the sidewall of axial blind holes 3 bottoms.Because the pressure obtaning device that is used for the differential pressure levelmeter of cryogenic liquid storage tank is installed in the minimum pressure point of liquid phase of cryogenic liquid storage tank 10; Guarantee that through copper wire heat transfer device 5 the enough heats of input arrive radially tracting pressuring hole 4 places; Cryogenic liquid is when getting into liquid phase pressure guiding pipe 14; Import under the heating of heat at copper wire heat transfer device 5, liquid has been vaporizated into gas basically, so in the liquid phase pressure guiding pipe 14 no liquid is got into.
After gas band pressure in the liquid phase pressure guiding pipe 14 was stable, because heat transfer device 5 constantly has heat to import, so gaseous tensions will constantly raise in the liquid phase pressure guiding pipe 14, cold liquid storage vessel 10 was arrived in unnecessary gas backstreaming, will form local boiling at inlet opening 8 places of damping lid 6 like this.Under the buffering of damping lid 6 and damper tube 2, the boiling at inlet opening 8 places will form stable boiling, and promptly the vaporization saturation pressure at storage tank gas-phase space 15 pressure and fluid column static pressure sum and inlet opening 8 places reaches balance.Inlet opening 8 inlets on the damping lid 6 will be covered by bubble, and under the heat conduction amount that is fit to, the inside and outside pressure of bubble also will reach balance.Thereby both guaranteed the cryogenic liquid gasification loss of trying one's best low in inlet opening 8 places, and can guarantee that again the full gas phase of pressure signal accurately derived, the fluid pressure force signal can be delivered to through stable gas column in differential pressure levelmeter 12 air cavitys.Like this; When the equalizing valve of opening differential pressure levelmeter 12; After the original pressure balance is the storage tank gaseous pressure in two corrugated tube condensation of water vapor of differential pressure levelmeter 12, turn-off two chambeies again and be communicated with equalizing valve, then the pressure reduction that records of differential pressure levelmeter 12 can correctly reflect the liquid level values of storing cryogenic liquids in the cold liquid storage vessel 10; And guarantee to have nothing to do with the installation site of differential pressure levelmeter 12, also can not form the cryogenic freezings injury to differential pressure levelmeter 12.
Through on cryogenic liquid (LNG, LN2, LO2, LAr, LCO2) storage tank and tank car, using checking, obtain very good effect, thoroughly solved the level gauging difficult problem of cryogenic liquid.
Claims (6)
1. be used for the pressure obtaning device of the differential pressure levelmeter of cryogenic liquid storage tank, it is characterized in that: comprise that the bottom is arranged on the base in the cryogenic liquid storage tank bottom insulation layer, base is provided with mounting hole; Be provided with damper tube in the mounting hole; System one inclined-plane is cut on two sides, damper tube top respectively, and the bottom of mounting hole is provided with axial blind hole on the base, and the sidewall of axial blind hole bottom is provided with radially tracting pressuring hole; The base bottom is provided with heat transfer device; Also be provided with the damping lid that damper tube is covered on the base, axially be provided with the bottom in the damping lid and be conical blind hole, damping lid bottom circumferentially is provided with some inlet openings that are connected with blind hole.
2. the pressure obtaning device that is used for the differential pressure levelmeter of cryogenic liquid storage tank as claimed in claim 1 is characterized in that: described heat transfer device is the heat conduction copper wire.
3. the pressure obtaning device that is used for the differential pressure levelmeter of cryogenic liquid storage tank as claimed in claim 1 is characterized in that: it is 4 that described damping covers the inlet opening quantity that is connected with blind hole, and circumferentially is distributed on damping and covers.
4. the pressure obtaning device that is used for the differential pressure levelmeter of cryogenic liquid storage tank as claimed in claim 1 is characterized in that: described base is provided with the installation step that is used to locate the damping lid.
5. the pressure obtaning device that is used for the differential pressure levelmeter of cryogenic liquid storage tank as claimed in claim 1 is characterized in that: the blind hole bottom that radially is provided with in the described damping lid is 90 ° of circular cones.
6. the pressure obtaning device that is used for the differential pressure levelmeter of cryogenic liquid storage tank as claimed in claim 5 is characterized in that: one 45 ° of inclined-planes of system are cut on two sides, described damper tube top respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110415020 CN102519543B (en) | 2011-12-14 | 2011-12-14 | Pressure detection device of differential pressure levelmeter for cryogenic liquid storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110415020 CN102519543B (en) | 2011-12-14 | 2011-12-14 | Pressure detection device of differential pressure levelmeter for cryogenic liquid storage tank |
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| Publication Number | Publication Date |
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| CN102519543A true CN102519543A (en) | 2012-06-27 |
| CN102519543B CN102519543B (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110415020 Active CN102519543B (en) | 2011-12-14 | 2011-12-14 | Pressure detection device of differential pressure levelmeter for cryogenic liquid storage tank |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693112A (en) * | 2020-05-12 | 2020-09-22 | 熊洪清 | Small-watershed water level monitoring device based on Internet of things and use method thereof |
| CN113624294A (en) * | 2021-10-11 | 2021-11-09 | 南通三锐化工装备有限公司 | Pressure measuring device of differential pressure measuring liquid level meter for cryogenic liquid storage tank |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4020690A (en) * | 1975-09-22 | 1977-05-03 | Samuels W Edward | Cryogenic liquid level measuring apparatus and probe therefor |
| JPS62294914A (en) * | 1987-06-19 | 1987-12-22 | Hitachi Ltd | Super-low temperature solvent liquid level meter |
| CN2504608Y (en) * | 2001-09-28 | 2002-08-07 | 刘建松 | Pressure device for liquid level differential pressure |
| CN201497528U (en) * | 2009-06-18 | 2010-06-02 | 项家从 | Anti-freeze differential pressure type flow meter without heat tracing |
| CN201757691U (en) * | 2010-07-21 | 2011-03-09 | 瓮福（集团）有限责任公司 | Device used for measuring pressure of fluid in fluid-filled container |
| CN202350862U (en) * | 2011-12-14 | 2012-07-25 | 张家港圣汇气体化工装备有限公司 | Pressure measuring device of differential pressure level meter for cryogenic liquid tank |
-
2011
- 2011-12-14 CN CN 201110415020 patent/CN102519543B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4020690A (en) * | 1975-09-22 | 1977-05-03 | Samuels W Edward | Cryogenic liquid level measuring apparatus and probe therefor |
| JPS62294914A (en) * | 1987-06-19 | 1987-12-22 | Hitachi Ltd | Super-low temperature solvent liquid level meter |
| CN2504608Y (en) * | 2001-09-28 | 2002-08-07 | 刘建松 | Pressure device for liquid level differential pressure |
| CN201497528U (en) * | 2009-06-18 | 2010-06-02 | 项家从 | Anti-freeze differential pressure type flow meter without heat tracing |
| CN201757691U (en) * | 2010-07-21 | 2011-03-09 | 瓮福（集团）有限责任公司 | Device used for measuring pressure of fluid in fluid-filled container |
| CN202350862U (en) * | 2011-12-14 | 2012-07-25 | 张家港圣汇气体化工装备有限公司 | Pressure measuring device of differential pressure level meter for cryogenic liquid tank |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693112A (en) * | 2020-05-12 | 2020-09-22 | 熊洪清 | Small-watershed water level monitoring device based on Internet of things and use method thereof |
| CN113624294A (en) * | 2021-10-11 | 2021-11-09 | 南通三锐化工装备有限公司 | Pressure measuring device of differential pressure measuring liquid level meter for cryogenic liquid storage tank |
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| CN102519543B (en) | 2013-02-13 |
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Owner name: CSSC SHENGHUI EQUIPMENT CO., LTD. Free format text: FORMER NAME: SHENGHUI GAS + CHEMICAL SYSTEMS (ZHANGJIAGANG) CO., LTD. |
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Address after: 215634, Linjiang Road, 3 Jin Gang Town, Suzhou, Jiangsu, Zhangjiagang Patentee after: CSSC SHENGHUI EQUIPMENT CO., LTD. Address before: 215600, Suzhou, Jiangsu, Zhangjiagang Linjiang Road, No. 3, Zhangjiagang Gas Chemical Equipment Co., Ltd. Patentee before: Shenghui Gas & Chemical Systems (Zhangjiagang) Co., Ltd. |
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Address after: 215634 Zhangjiagang Shenghui Gas Chemical Equipment Co., Ltd., No. 3 Linjiang Road, Jinggang Road, Zhangjiagang, Suzhou, Jiangsu Patentee after: Suzhou Saint remittance Equipment Co., Ltd. Address before: 215634 Zhangjiagang Shenghui Gas Chemical Equipment Co., Ltd., No. 3 Linjiang Road, Jinggang Road, Zhangjiagang, Suzhou, Jiangsu Patentee before: CSSC SHENGHUI EQUIPMENT CO., LTD. |
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