CN105547380A - Liquid hydrogen flow measuring device - Google Patents
Liquid hydrogen flow measuring device Download PDFInfo
- Publication number
- CN105547380A CN105547380A CN201610109527.7A CN201610109527A CN105547380A CN 105547380 A CN105547380 A CN 105547380A CN 201610109527 A CN201610109527 A CN 201610109527A CN 105547380 A CN105547380 A CN 105547380A
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- Prior art keywords
- porous
- liquid hydrogen
- inner tube
- hydrogen flow
- pressure
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
Abstract
The invention discloses a liquid hydrogen flow measuring device which comprises a shell inner pipe and a shell outer pipe and further comprises a porous balance throttling piece. The shell inner pipe and the shell outer pipe are connected through connecting cones at two ends. The porous balance throttling piece is perpendicularly installed on the section of the shell inner pipe, is of a porous disc structure and coaxial with the shell inner pipe. Balance holes in the porous balance throttling piece are distributed in a disc. The positions, on the two sides of the porous balance throttling piece, of the shell inner pipe are each provided with a pressure guide hole. The two pressure guide holes are connected with one ends of two pressure guide pipes respectively. The other ends of the pressure guide pipes penetrate through the shell outer pipe in a sealed mode and are connected with a differential pressure transmitter through a pressure change-over valve and a three-valve set. A cavity between the shell inner pipe and the shell outer pipe is vacuumized. The flow field can be balanced and adjusted; the whole device is free of movement parts and can bear the flow impact of high-speed flow; heat loss of low-temperature liquid can be greatly reduced through vacuum heat preservation, gasification is reduced, and the measurement precision and application range of flow of low-temperature liquid can be increased.
Description
Technical field
The invention belongs to a kind of device for cryogenic liquid flow measurement, particularly relate to the device measuring liquid hydrogen flow in a kind of pipeline.
Background technology
Divide at sky, the technical field such as space flight, conventional cryogenic liquid flow measurement abacus flowmeter, vortex shedding flow meter and turbo flow meter.Liquid hydrogen belongs to pole cryogen, under leaking the impact of heat, often exists with liquids and gases two states in pipe conveying procedure in external environment condition.
On engineer applied, in cryogenic media fields of measurement, orifice flowmeter obtains more application due to dependable performance, but orifice plate is due to Flange joint, easily produce under extremely low temperature state and leak erosion phenomenon, and due to the architectural feature of orifice plate, before and after it, flow field is subject to the impact of measuring section length of pipe and becomes very unstable, measuring point pressure fluctuations amplitude is larger, after also having orifice throttle, crushing is larger, gasification phenomenon is relatively serious, causes lower to the measuring accuracy of cryogenic liquid and applicable elements is narrower.Low temperature vortex shedding flow meter increases in measuring accuracy, and movement-less part, but to work under liquid hydrogen warm area existing defects due to vortex street measuring equipment, there is no corresponding liquid hydrogen vortex shedding flow meter at home at present.Turbo flow meter is when measuring pole cryogen, the most incidental fault is after the sharply evaporation because of cryogenic liquid in pipeline, because turbo flow meter inner structure exists moving link, rotor rotates with the speed of decades of times faster than usual rotating speed, and particularly for liquid hydrogen medium, must purge and precooling pipeline, now in pipe, gas flow rate is very big, the rolling bearing part of turbo flow meter is difficult to bear so high flow velocity in this case, by causing the decline of turbo flow meter measuring accuracy, even there is bearing damage.To sum up, all there is the defect of some measurements above or in performance in current Conventional cryogenic liquid flow measurement, especially liquid hydrogen flow measurement.
Summary of the invention
The object of the invention is to the above-mentioned defect for existing in prior art, a kind of special nature that can be applicable to pole cryogenic liquid is better provided, thus improve the measuring accuracy of flow measurement and the liquid hydrogen flow measurement device of operation stability.
The object of the invention is to realize by the following technical solutions: this liquid hydrogen flow measurement device, it comprises vacuum tubes, and this vacuum tubes comprises and connects by two ends the housing inner tube and housing outer tube that centrum connects; Also comprise porous balance throttling element, porous balance throttling element is vertically mounted on the cross section of housing inner tube, and described porous balance throttling element is a kind of porous disc structure, and coaxially arrange with housing inner tube, the equalizing port on it is arranged on disk; The both sides described housing inner tube being positioned at porous balance throttling element are respectively arranged with a tracting pressuring hole, two tracting pressuring holes are connected with one end of two pressure guiding pipes respectively, and the other end hermetically passing housing outer tube of pressure guiding pipe is also connected with differential pressure transmitter with three valve groups by pressure changeover valve; Cavity between described housing inner tube and housing outer tube vacuumizes.
Concrete, described housing outer tube is fixed by the outer casing supporting of its periphery, two ends.
Concrete, described housing outer tube is provided with pressure inlet, and described pressure inlet is connected with retaining valve, for vacuumizing.
Further, described housing inner tube outer wall is provided with absorbent cavity, with copper wire sews up, for adsorb residual gas after loading activated charcoal in chamber.
Further, the cylindrical member of described connection cone to be cross section be taper type, be cavity between its inside surface and outside surface, be filled with the adiabatic ring of fiberglass, connect cone and can increase heat conduction length in cavity, the adiabatic ring of fiberglass can reduce heat conduction.
The present invention is a kind of vacuum type differential pressure flowmeter be arranged on liquid hydrogen vacuum line, and its principle is that the differential pressure utilizing fluid flow through porous to balance throttling element generation carrys out measuring flow.The invention has the advantages that, porous balance throttling element is porous balanced structure, when fluid flows through throttling element, flow field will be balanced adjustment, obviously can reduce the formation of eddy current and the loss of fluid dynamic energy, possesses stronger cavitation ability, for cryogenic fluids such as the liquid hydrogen such as with the little characteristic of the latent heat of vaporization.
Measurement mechanism of the present invention can with pipeline welded and installed, be easy to take vacuum heat-preserving measure, greatly can reduce the thermal losses of cryogenic liquid.It not only inherits that the structure of traditional throttle orifice plate apparatus is simple, movement-less part, the advantage such as safe and reliable, and avoid that the crushing brought due to pipeline section sudden contraction is large, energy consumption is high, and many performance deficiencies such as range ratio is little, precision is low, straight length will be rectificated, maintenance is large.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of the embodiment of the present invention.
Left view when Fig. 2, Fig. 3 are equalizing port two kinds of different situations in the porous balance throttling element of Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
See Fig. 1, the liquid hydrogen flow measurement device of the present embodiment, comprises vacuum tubes 2, porous balance throttling element 4, two pressure guiding pipes 10, two pressure changeover valve 11, three valve groups 12, differential pressure transmitters 13.Vacuum tubes 2 comprises the housing inner tube 5 and the housing outer tube 6 that are connected centrum 8 connection by two ends, and housing outer tube 6 is fixed by the outer casing supporting 1 of its periphery, two ends.See Fig. 2, Fig. 3, housing outer tube 6 is provided with the pressure inlet 15 be connected with retaining valve 14, for being vacuumized by the cavity between housing inner tube 5 and housing outer tube 6.Both sides housing inner tube 5 being positioned at porous balance throttling element 4 are respectively equipped with a tracting pressuring hole 7, and housing inner tube 5 outer wall is provided with absorbent cavity 3, with copper wire sew up, for adsorb residual gas after loading activated charcoal in absorbent cavity 3.Connect cone 8 and can increase heat conduction length, be cavity between its inside surface and outside surface, be filled with adiabatic ring 9 in cavity, can heat conduction be reduced.From Fig. 2, Fig. 3, porous balance throttling element 4 is a kind of porous disc structures, equalizing port on it is arranged on disk according to the classification of surveyed cryogen, the demand such as fluid-velocity survey scope and measuring accuracy, can balanced adjustment flow field, the equalizing port on the porous balance throttling element 4 shown in Fig. 2, Fig. 3 is arranged different; Porous balance throttling element 4 is vertically mounted on the cross section of housing inner tube 5, and coaxially arranges with housing inner tube 5.One end of two pressure guiding pipes 10 is connected with the tracting pressuring hole of two on housing inner tube 57, and the other end of two pressure guiding pipes 10 is connected with pressure difference transmitter 13 with three valve groups 12 respectively by two pressure changeover valves 11.
Structure of the present invention is simple, movement-less part, overcomes current Conventional cryogenic liquid flow measurement, the defect of some measurements above or in performance of especially liquid hydrogen flow measurement existence, improve the measuring accuracy to cryogenic liquid flow and the scope of application, ensure the stability that equipment runs.
Claims (5)
1. a liquid hydrogen flow measurement device, is characterized in that: it comprises vacuum tubes, and this vacuum tubes comprises the housing inner tube and the housing outer tube that are connected centrum connection by two ends; Also comprise porous balance throttling element, porous balance throttling element is vertically mounted on the cross section of housing inner tube, and described porous balance throttling element is a kind of porous disc structure, and coaxially arrange with housing inner tube, the equalizing port on it is arranged on disk; The both sides described housing inner tube being positioned at porous balance throttling element are respectively arranged with a tracting pressuring hole, two tracting pressuring holes are connected with one end of two pressure guiding pipes respectively, and the other end hermetically passing housing outer tube of pressure guiding pipe is also connected with differential pressure transmitter with three valve groups by pressure changeover valve; Cavity between described housing inner tube and housing outer tube vacuumizes.
2. liquid hydrogen flow measurement device according to claim 1, is characterized in that: described housing outer tube is fixed by the outer casing supporting of its periphery, two ends.
3. liquid hydrogen flow measurement device according to claim 1, is characterized in that: described housing outer tube is provided with pressure inlet, and described pressure inlet is connected with retaining valve.
4. liquid hydrogen flow measurement device according to claim 1, is characterized in that: described housing inner tube outer wall is provided with absorbent cavity, with copper wire sews up after loading activated charcoal in chamber.
5. liquid hydrogen flow measurement device according to claim 1, is characterized in that: the cylindrical member of described connection cone to be cross section be taper type, is cavity between its inside surface and outside surface, is filled with the adiabatic ring of fiberglass in cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610109527.7A CN105547380A (en) | 2016-02-26 | 2016-02-26 | Liquid hydrogen flow measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610109527.7A CN105547380A (en) | 2016-02-26 | 2016-02-26 | Liquid hydrogen flow measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105547380A true CN105547380A (en) | 2016-05-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610109527.7A Pending CN105547380A (en) | 2016-02-26 | 2016-02-26 | Liquid hydrogen flow measuring device |
Country Status (1)
| Country | Link |
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| CN (1) | CN105547380A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525159A (en) * | 2016-11-10 | 2017-03-22 | 太原市普瑞兴生仪表有限公司 | Air flow measurement device |
| CN112730505A (en) * | 2020-12-18 | 2021-04-30 | 上海交通大学 | Visual experiment chamber for throttling and quantitative measurement of cryogenic fluid |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57163820A (en) * | 1981-04-01 | 1982-10-08 | Kawasaki Heavy Ind Ltd | Flowmeter for low temperature |
| CN201392216Y (en) * | 2009-04-30 | 2010-01-27 | 沈阳聚焦科技有限公司 | Energy-saving differential pressure flowmeter |
| CN102393224A (en) * | 2011-12-13 | 2012-03-28 | 衡阳中微科技开发有限公司 | Integrated intelligent flowmeter and measuring method |
| CN203011441U (en) * | 2012-12-28 | 2013-06-19 | 中国石油天然气股份有限公司长庆石化分公司 | Low temperature wedge-type flow meter |
| CN204556035U (en) * | 2014-04-16 | 2015-08-12 | 迪特里奇标准公司 | Flowmeter |
| CN205426246U (en) * | 2016-02-26 | 2016-08-03 | 总装备部工程设计研究总院 | Liquid hydrogen flow measuring device |
-
2016
- 2016-02-26 CN CN201610109527.7A patent/CN105547380A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57163820A (en) * | 1981-04-01 | 1982-10-08 | Kawasaki Heavy Ind Ltd | Flowmeter for low temperature |
| CN201392216Y (en) * | 2009-04-30 | 2010-01-27 | 沈阳聚焦科技有限公司 | Energy-saving differential pressure flowmeter |
| CN102393224A (en) * | 2011-12-13 | 2012-03-28 | 衡阳中微科技开发有限公司 | Integrated intelligent flowmeter and measuring method |
| CN203011441U (en) * | 2012-12-28 | 2013-06-19 | 中国石油天然气股份有限公司长庆石化分公司 | Low temperature wedge-type flow meter |
| CN204556035U (en) * | 2014-04-16 | 2015-08-12 | 迪特里奇标准公司 | Flowmeter |
| CN205426246U (en) * | 2016-02-26 | 2016-08-03 | 总装备部工程设计研究总院 | Liquid hydrogen flow measuring device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525159A (en) * | 2016-11-10 | 2017-03-22 | 太原市普瑞兴生仪表有限公司 | Air flow measurement device |
| CN112730505A (en) * | 2020-12-18 | 2021-04-30 | 上海交通大学 | Visual experiment chamber for throttling and quantitative measurement of cryogenic fluid |
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Application publication date: 20160504 |