CN209656489U - Automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device - Google Patents
Automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device Download PDFInfo
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- CN209656489U CN209656489U CN201920249805.8U CN201920249805U CN209656489U CN 209656489 U CN209656489 U CN 209656489U CN 201920249805 U CN201920249805 U CN 201920249805U CN 209656489 U CN209656489 U CN 209656489U
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- evaporation rate
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Abstract
The utility model discloses a kind of automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test devices, it is characterized in that, including pedestal, the pedestal is equipped with testing tube, the testing tube front end is connect with the blow-down pipe of tested bottle, rear end is connect with gas withdrawal line, is successively arranged heating device, thermometer, pressure gauge, flowmeter, Low lift safety valve on the testing tube from front to back, is equipped with fall lift safety valve, vent stop valve between pressure gauge, flowmeter on the testing tube.The utility model, directly with insulated gas cylinder piping connection, is not necessarily to as in the prior art each component both saving built-up time successively with gas cylinder piping connection using single unit system, while avoiding the air-tightness between being dismounted for multiple times influence component.
Description
Technical field
The utility model relates to the tests of the static evaporation rate of insulated gas cylinder, steam in particular to a kind of automobile-used LNG gas cylinder static state
Hair rate pressure-maintaining test device.
Background technique
With the publication and implementation of GB/T 34347-2017 " cryogenic insulated cylinder periodic inspection and evaluation ", the whole nation is automobile-used
LNG gas cylinder periodic inspection has relatively uniform method.In the standard, allow to tear open using non-about automobile-used LNG gas cylinder inspection
The method unloaded is directly based upon LNG medium and tests test.Experimental rig is to set gradually to put on the blowdown piping of detected pieces
Blank pipe valve, heating device, thermometer, gas mass flow meter.Test process are as follows: at least static after insulated gas cylinder internal-filling liquid
48h, quiescent period open the incoming stream meter of blow valve → when liner meter pressure is close to zero, record after stability of flow every 1h
Data → calculating static evaporation rate.
This method greatly improves the checkability of such gas cylinder, but in actual operation, and automobile-used LNG gas cylinder is different from work
Industry cryogenic insulated cylinder, working environment are mainly used in public transport, coach, lorry, and public affairs are played in most regions at home
The public transport of service function, car quantity is not rich altogether, usually arranges labour movement row more at full capacity.And the base of automobile-used LNG gas cylinder inspection
This round of visits at least 48h or more, having inspected the rear pressure in the bottle is 0, if equipment is not separately provided from pressure charging system, until
One day or more time is needed to wait for its boosting less, vehicle can sail out of inspection point, be detained 4 days so that examining will cause vehicle every time
The left and right time exerts heavy pressures on to municipal public service, causes biggish financial burden to enterprise.
Jiang Yangchun discloses a kind of vehicle-mounted LNG gas cylinder on-line measuring device " mechanical & electrical technology " the 3rd in 2015 is interim, real
Existing gas cylinder does not dismantle inspections online, on the pipeline of tested bottle successively backward setting safety valve, pressure gauge, pressure controller,
Heating device, thermometer, mass flowmenter keep the detection pressure in bottle relative constant using pressure controller, and existing gas cylinder is certainly
With blow-down pipe, blow valve, the pressure gauge for showing the pressure in the bottle.Test process is directly tested using the device.But the dress
It sets and has the drawback that
1. above-mentioned component need to be successively assembled on the pipeline of gas cylinder when test, it is airtight after built-up time length, being dismounted for multiple times
Property is poor；2. being equipped with heat riser after pressure controller and no pressure table, there are pressure differences for pressure controller, are not necessarily thereafter often
Pressure, and volume expansion is led to by the heating temperature difference, the evaporation capacity bulk density of medium is being pressed under pressure environment before pressure controller
It changes again after force controller, the flow value distortion thus recorded causes institute's measured data error larger；3. after measurement,
Contain elevated pressures in complete equipment, and without pressure-relief measure, disassembly process cannot ensure safely with press operation, operator；
4. the single pressure of change, has not been changed other parameters, and under different pressure conditions, medium physical parameter has very big difference, such as presses
Former formula calculates α20It is unable to get truthful data.
Therefore, it is necessary to develop, a kind of structure is simple, measurement error is small, the evaporation of the automobile-used LNG gas cylinder static state of safe operation
Rate pressure-maintaining test device.
Summary of the invention
The purpose of this utility model seeks to solve the deficiency of above-mentioned background technique, provides that a kind of structure is simple, measurement misses
Small, safe operation the automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device of difference.
The technical solution of the utility model are as follows: a kind of automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device, feature exist
In, including pedestal, the pedestal is equipped with testing tube, and described testing tube one end is connect with the blow-down pipe of tested bottle, the other end and
Gas withdrawal line connection is successively arranged heating device on the testing tube from front to back, thermometer, pressure gauge, flowmeter, micro- opens
Formula safety valve is equipped with fall lift safety valve, vent stop valve on the testing tube between pressure gauge, flowmeter.
Preferably, the testing tube includes the first metal tube, the second metal tube, third metal set gradually from front to back
Pipe, the rear and front end of second metal tube respectively with the first metal tube, third metal tube detachable connection；
The heating device, thermometer, pressure gauge are set in turn in from front to back on the first metal tube, first metal tube
Fall lift safety valve, vent stop valve are set after pressure gauge；The flowmeter is set on the second metal tube；The micro-open type
Safety valve is set on third metal tube.
Further, first metal tube rear end, the second metal tube front and back end, third metal tube the equal screw thread in front end connect
Be connected to Pneumatic quick connector, first metal tube rear end, the second metal tube front end Pneumatic quick connector between clamping first connect
Adapter tube, second metal tube rear end, third metal tube Pneumatic quick connector between be clamped the second connecting tube.
Preferably, first metal tube is fixed on pedestal by the first support member.
Further, first support member includes the fixed block being set on pedestal and above fixed block
Latch segment, the fixed block top surface is recessed, locking corresponding with the first metal tube cross section is collectively formed in latch segment bottom surface fovea superior
Slot, bolt are passed down through latch segment and fixed block, latch segment are connected.
Preferably, the third metal tube is fixed on pedestal by the second support member.
Preferably, first metal tube front end is connect with the blow-down pipe of tested bottle.
The test method of above-mentioned automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device, step are as follows:
A. the blow valve carried on tested bottle blow-down pipe is opened, when the tested pressure in the bottle is vented to being lower than but close to micro-open type
When the cracking pressure of safety valve, blow valve is closed；
B. automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device is accessed, vent stop valve is kept to close, it is micro- at this time to open
Formula safety valve is in off state；
C. blow valve is opened, after the tested pressure in the bottle, which is raised slowly to Low lift safety valve, opens, observation pressure gauge is read
Number judges that tested bottle reaches homeostasis when variation range is no more than %, start to be spaced recording thermometer, pressure within the set time
Power table, flow meter data；
D. blow valve is closed after testing, opens vent stop valve, is dismantled automobile-used LNG gas cylinder static evaporation rate pressure maintaining and is surveyed
Trial assembly is set, and high vacuum multiple layer heat insulation static evaporation rate α is calculated20。
Preferably, the tested pressure in the bottle is checked by carrying pressure gauge on tested bottle in step a.
Preferably, high vacuum multiple layer heat insulation static evaporation rate α is calculated in step d20When, it will first test obtained steady state pressure
Value is converted into absolute pressure value, detected pieces Nei Ping when the latent heat of vaporization h of saturated liquid and test under parameter experiment environmental pressure
The corresponding cryogenic liquid saturation temperature T of equal pressure2Its numerical value uses the corresponding saturated liquid latent heat of vaporization of absolute pressure value, deep cooling
Saturation temperature.
The utility model has the following beneficial effects:
1. being not necessarily to each component as in the prior art successively using single unit system directly with insulated gas cylinder piping connection
With gas cylinder piping connection, built-up time is both saved, while avoiding the air-tightness between being dismounted for multiple times influence component.
2. flowmeter is located on the second metal tube being detachably connected, since flowmeter belongs to precision instrument, need often
Calibrating, is detachably connected with and facilitates carry out periodic verification.Heating device is located at pipeline front end, and Low lift safety valve is located at pipeline
Rearmost end, thus it is identical by the front and back pressure environment of flowmeter, and the evaporation capacity of medium, bulk density phase before and after flowmeter
Together, the flow value true and accurate of record.
3. being provided with the vent stop valve of manual operation, after being completed closing gas cylinder valve, emptying cut-off is opened
Valve blowdown piping pressure rear demountable device, avoids disassembly with pressure, has ensured the safety of tester.Fall lift safety valve is then
As safety guard, in Low lift safety valve failure, to evade superpressure risk, set-pressure is typically larger than for take-off
Pressure when Low lift safety valve is all turned on can bear maximum pressure less than remaining part.
4. using Low lift safety valve for pressure maintaining voltage stabilizing element, initial state is in off state, and system pressure is raised slowly to
Low lift safety valve is opened, and as storage pressure slowly increases, Low lift safety valve Lift is gradually increased, the amount of releasing
Slowly increase and finally reaches that the heated evaporation capacity of medium is equal with the Low lift safety valve amount of releasing, the pressure in the bottle in a certain pressure value
The homeostasis equal with the spring force of Low lift safety valve, to realize that stable state pressure maintaining measures.
5. test device structure is simple, easy to operate, can guarantee while automobile-used LNG gas cylinder static evaporation rate measures
Possess enough pressure in gas cylinder, play and shorten Check-Out Time, mitigates the purpose of public municipal pressure.
6. guaranteeing going on smoothly for test by first closing vent stop valve in test method, then pass through vent stop valve
It opens and carries out safety relief.
7. to high vacuum multiple layer heat insulation static evaporation rate α in test method20Parameter h, T2It is modified, as a result obtains
It detects in the metastable situation of environment, static evaporation error obtained by pressure maintaining method of testing and Standard Test Method can control substantially
Within 5%, meet national regulations.
Detailed description of the invention
Fig. 1 is the schematic diagram of the automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device of the utility model
Fig. 2 is the first support member of the utility model side view
Fig. 3 is the measuring state schematic diagram of the automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device of the utility model
Wherein: 1- pedestal 2- heating device 3- thermometer 4- pressure gauge 5- fall lift safety valve 6- vent stop valve 7-
Flowmeter 8- Low lift safety valve 9- the first support member 10- the second support member 11- the first metal tube the second gold medal of 12-
Belong to pipe 13- third metal tube 14- fixed block 15- latch segment 16- locking slot 17- bolt 18- and is detected bottle 19- blow-down pipe
20- blow valve 21- carries pressure gauge 22- Pneumatic quick connector.
Specific embodiment
The utility model is described in further detail for specific embodiment below.
As shown in Figs. 1-2, a kind of automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device provided by the utility model, packet
Pedestal 1 is included, pedestal 1 is equipped with testing tube, and testing tube front end is connect with the blow-down pipe 19 of tested bottle 18, rear end and gas recovery pipe
Road connects, and is successively arranged heating device 2, thermometer 3, pressure gauge 4, flowmeter 7, Low lift safety valve 8 from front to back on testing tube,
Fall lift safety valve 5, vent stop valve 6 are equipped on testing tube between pressure gauge 4, flowmeter 7.
Testing tube includes the first metal tube 11, the second metal tube 12, third metal tube 13 from front to back successively, the second gold medal
Belong to pipe 12 rear and front end respectively with the first metal tube 11,13 detachable connection of third metal tube；Heating device 2, thermometer 3,
Pressure gauge 4 is set in turn in from front to back on the first metal tube 11, and complete opening type safety is arranged in the first metal tube 11 after pressure gauge 4
Valve 5, vent stop valve 6 (fall lift safety valve 5,6 tandem interchangeable of vent stop valve)；Second metal tube is equipped with stream
Meter 7；Third metal tube is equipped with Low lift safety valve 8.In the present embodiment, front and back into same Fig. 1 left and right to.
First metal tube, 11 rear end, 12 front and back end of the second metal tube, third metal tube 13 front end be threaded with gas
Dynamic quick coupling 22,11 rear end of the first metal tube, 12 front end of the second metal tube Pneumatic quick connector 22 between detachable card
Connect the first connecting tube (not marked in figure), 12 rear end of the second metal tube, third metal tube 13 Pneumatic quick connector 22 between it is removable
Unload the second connecting tube of clamping (not marking in figure) of formula.Pneumatic quick connector 22 is existing Pneumatic quick connector, and one end is equipped with
Screw thread, the other end are equipped with detachable cutting ferrule.
First metal tube 11 is fixed on pedestal 1 by the first support member 9.First support member 9 includes being set to bottom
Fixed block 14 on seat 1 and the latch segment 15 above fixed block 14,14 top surface of fixed block is recessed, on 15 bottom surface of latch segment
Recessed that locking slot 16 corresponding with 11 cross section of the first metal tube is collectively formed, bolt 17 is passed down through latch segment 15 for fixed block
14, latch segment 15 is connected.
Third metal tube 13 is fixed on pedestal 1 by the second support member 10.Second support member 10 and the first support
9 structure of component is identical.First metal tube, 11 front end is connect with the blow-down pipe 19 of tested bottle 18.Fall lift safety valve 5 is as safety
Protective device, when Low lift safety valve 8 fails, to evade superpressure risk, set-pressure is typically larger than micro-open type peace for take-off
Pressure when full valve 8 is all turned on can bear maximum pressure less than remaining part.In the present embodiment, pedestal 1, first is supported
Component 9, the second support member 10 are stainless steel material, and the first metal tube 11, the second metal tube 12, third metal tube 13 are
304 stainless steel metal pipes.Fall lift safety valve 5, Low lift safety valve 8 are existing product, and flowmeter 7 is gas mass flow
Meter.
As shown in figure 3, the test method of the automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device of the utility model, step
Are as follows:
A. the blow valve 20 carried on tested 18 blow-down pipe 19 of bottle is opened, the included pressure gauge 21 being detected on bottle 18 is passed through
Check that (blow-down pipe 19, blow valve 20, included pressure gauge 21 are the portion on tested bottle 18 in the prior art to pressure in tested bottle 18
Part), when pressure-emptying closes blow valve 20 to being lower than but when close to the cracking pressure of Low lift safety valve 8 in tested bottle 18；
B. automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device is connect with blow-down pipe 19, vent stop valve 6 is kept to close
It closes, Low lift safety valve 8 is in off state at this time；
C. open blow valve 20, when in tested bottle 1 pressure slowly rise open Low lift safety valve 8 gradually after, observe
Pressure gauge 4 is read, and judges that tested bottle 18 reaches homeostasis and (forms closed-loop in tested bottle 18 when variation range is no more than 5%
Border, as gas cylinder leaks heat, system pressure is raised slowly to the unlatching of Low lift safety valve 8, and with pressure in tested bottle 18
It slowly increases, 8 Lift of Low lift safety valve is gradually increased, and the amount of releasing slowly increases and finally reaches Jie in a certain pressure value
Matter is heated, and evaporation capacity is equal with 8 amount of releasing of Low lift safety valve, the pressure in the bottle is equal with the spring force of Low lift safety valve
Homeostasis, to realize that stable state pressure maintaining measures), start to be spaced recording thermometer 3, pressure gauge 6, flowmeter within the set time
9 data；
D. blow valve 20 is closed after testing, opens vent stop valve 8, is dismantled automobile-used LNG gas cylinder static evaporation rate and is protected
Compression testing device calculates high vacuum multiple layer heat insulation static evaporation rate α20, calculate high vacuum multiple layer heat insulation static evaporation rate α20When,
Teady state pressure value (being measured by pressure gauge 4) is converted into absolute pressure value, saturated solution under parameter experiment environmental pressure when will first test
The latent heat of vaporization h of body cryogenic liquid saturation temperature T corresponding with pressure per day in detected pieces when test2Its numerical value is using absolute
The corresponding saturated liquid latent heat of vaporization of pressure value, cryogenic liquid saturation temperature.
The pressure maintaining test method for the static evaporation rate that the utility model is inquired into, operation mode are based primarily upon standard GB/T
Calculation method in 18443.5-2010.But for the 8.2.1 articles high vacuum multiple layer heat insulation static evaporation rate α in standard20It calculates
H and T in formula2Parameter selection need to be modified, and be come according to the corresponding pressure gauge indicating value of lower state in pressure maintaining test process
It chooses.
By taking steady state pressure when testing indicates that value is 0.61MPa as an example, then absolute pressure is in detected pieces when testing
0.71135MPa (absolute pressure=pressure gauge indicating value+scene atmospheric value), test medium is natural gas, and main component is first
Alkane.Data in standard GB/T 18442.3-2011 appendix A Table A .4 are looked into, corresponding saturated liquid can be obtained under 0.71135MPa
Latent heat of vaporization h=438.55kJ/kg (specific steam enthalpy-liquid specific enthalpy), corresponding cryogenic liquid saturation temperature T2=142K, respectively
Replace the saturated liquid latent heat of vaporization 510.42kJ/kg and cryogenic liquid saturation temperature 111.63K under former atmospheric pressure environment, then will
Institute's value, which substitutes into formula, can obtain revised standard static evaporation rate.
Experimental verification
Experimental verification is compared to automobile-used LNG gas cylinder using method in national standard Plays method and the utility model.
Experimentation mainly takes the same automobile-used LNG gas cylinder for being filled into specified liquid level, stands back 24 hours using static
Evaporation rate pressure maintaining method of testing is tested and calculates static evaporation rate α20', pressure release after the completion of test is surveyed using standard static evaporation rate
Method for testing continues test for 24 hours and calculates static evaporation rate α20", the correctness of its result of comparative analysis.It as shown in table 1, is part
Static evaporation rate comparing result.
1 Experimental comparison's data instance of table
It is proved by comparative experiments: in the case where detecting the metastable situation of environment, pressure maintaining method of testing and Standard Test Method institute
Obtaining static evaporation error can control within 5% substantially, meet the 7.1.6 articles of GB/T18443.5-2010 regulation, to test
Demonstrate,prove the feasibility of pressure maintaining method of testing.
Claims (6)
1. a kind of automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device, which is characterized in that including pedestal (1), the pedestal
(1) it is equipped with testing tube, the testing tube front end is connect with the blow-down pipe (19) of tested bottle (18), rear end and gas withdrawal line
Connection is successively arranged heating device (2) on the testing tube from front to back, thermometer (3), pressure gauge (4), flowmeter (7), micro- opens
Formula safety valve (8) is equipped with fall lift safety valve (5), vent stop valve on the testing tube between pressure gauge (4), flowmeter (7)
(6)。
2. automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device as described in claim 1, which is characterized in that the test
Managing includes the first metal tube (11), the second metal tube (12), the third metal tube (13) set gradually from front to back, and described second
The rear and front end of metal tube (12) respectively with the first metal tube (11), third metal tube (13) detachable connection；
The heating device (2), thermometer (3), pressure gauge (4) are set in turn in from front to back on the first metal tube (11), described
Fall lift safety valve (5), vent stop valve (6) is arranged in pressure gauge (4) in first metal tube (11) afterwards；The flowmeter (7) sets
It is placed on the second metal tube (12)；The Low lift safety valve (8) is set on third metal tube (13).
3. automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device as claimed in claim 2, which is characterized in that described first
Metal tube (11) rear end, the second metal tube (12) front and back end, third metal tube (13) front end be threaded with it is pneumatic quickly
Connector (22), the first metal tube (11) rear end, the second metal tube (12) front end Pneumatic quick connector (22) between be clamped
One connecting tube, the second metal tube (12) rear end, third metal tube (13) Pneumatic quick connector (22) between clamping second connect
Adapter tube.
4. automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device as claimed in claim 2, which is characterized in that described first
Metal tube (11) is fixed on pedestal (1) by the first support member (9).
5. automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device as claimed in claim 4, which is characterized in that described first
Support member (9) includes the fixed block (14) being set on pedestal (1) and the latch segment (15) being located above fixed block (14),
Fixed block (14) top surface is recessed, latch segment (15) bottom surface fovea superior be collectively formed it is corresponding with the first metal tube (11) cross section
Locking slot (16), bolt (17) are passed down through latch segment (15) and fixed block (14), latch segment (15) are connected.
6. automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device as claimed in claim 2, which is characterized in that the third
Metal tube (13) is fixed on pedestal (1) by the second support member (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018217799528 | 2018-10-30 | ||
| CN201821779952 | 2018-10-30 |
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| Publication Number | Publication Date |
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| CN209656489U true CN209656489U (en) | 2019-11-19 |
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ID=68525335
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| CN201920249805.8U Active CN209656489U (en) | 2018-10-30 | 2019-02-27 | Automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655370A (en) * | 2018-10-30 | 2019-04-19 | 武汉市锅炉压力容器检验研究所 | Automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device and test method |
| CN113804717A (en) * | 2021-08-12 | 2021-12-17 | 江苏省特种设备安全监督检验研究院 | Visual experimental apparatus |
-
2019
- 2019-02-27 CN CN201920249805.8U patent/CN209656489U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655370A (en) * | 2018-10-30 | 2019-04-19 | 武汉市锅炉压力容器检验研究所 | Automobile-used LNG gas cylinder static evaporation rate pressure-maintaining test device and test method |
| CN109655370B (en) * | 2018-10-30 | 2024-03-15 | 武汉市锅炉压力容器检验研究所 | Vehicle LNG gas cylinder static evaporation rate pressure maintaining testing device and testing method |
| CN113804717A (en) * | 2021-08-12 | 2021-12-17 | 江苏省特种设备安全监督检验研究院 | Visual experimental apparatus |
| CN113804717B (en) * | 2021-08-12 | 2023-10-24 | 江苏省特种设备安全监督检验研究院 | Visual experimental device |
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