CN201269771Y - Non-leakage air flow rate calibration device by sound speed nozzle method - Google Patents
Non-leakage air flow rate calibration device by sound speed nozzle method Download PDFInfo
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- CN201269771Y CN201269771Y CNU2008201341817U CN200820134181U CN201269771Y CN 201269771 Y CN201269771 Y CN 201269771Y CN U2008201341817 U CNU2008201341817 U CN U2008201341817U CN 200820134181 U CN200820134181 U CN 200820134181U CN 201269771 Y CN201269771 Y CN 201269771Y
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- sonic nozzle
- meter
- straight length
- nozzle
- temperature transmitter
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Abstract
The utility model discloses a zero leakage-loss sonic nozzle-method gas flow standard device which comprises an upstream straight pipe section, a pressure transmitter and a temperature transmitter at the position of a tested meter, the tested meter, a downstream straight pipe section, a pressure transmitter and a temperature transmitter at the position of a stagnation container, the stagnation container, a sonic nozzle, a manifold, a pressure stabilizing tank, a vacuum pump, a nozzle sealing assembly which consists of an electromagnetic valve, a standard cylinder, an end surface sealing component and a vacuum rubber washer, as well as a clamp meter sealing assembly which is composed of a meter clamping device, an H-typed sealing blind plate and a vacuum rubber washer. Compared with the prior art, the standard device has the advantages of simple structure, lower cost, high stability and reliability and good precision, and is applicable to the testing and calibration of multiple gas flow meters.
Description
Technical field
The related a kind of gas flow standard device of the utility model, what be specifically related to is the zero wastage sonic nozzle method gas flow standard device of making standard scale with sonic nozzle.
Background technology
Fig. 1 is traditional sonic nozzle method gas flow standard device principle schematic, it is with vacuum pump 114 porch of air by the upstream straight length 103 of tested table 105 to be sucked, enter stagnation container 110 through tested table 105 and downstream straight length 106, downstream at stagnation container 110, one group of sonic nozzle 111 is arranged, by the keying quantity of ball valve in control and the ball valve group 101 that sonic nozzle 111 links to each other, to reach the purpose of change by tested table 105 flow.Can record temperature value and force value by pressure unit on the stagnation container 110 108 and temperature transmitter 109, the relevant formula with the force value substitution of temperature value is calculated the mass rate that can obtain by sonic nozzle 111.And temperature value and force value that pressure unit 104 and temperature transmitter 107 by tested table 105 place can obtain tested table 105 place, thereby can calculate atmospheric density, and then obtain the standard volume flow.Ball valve group 102 can be closed idle pipeline, opens detected pipeline, and between ball valve group 101 and vacuum pump 114 is buffer tank 113 and header 112.Like this, just can with the flow by tested table 105 and with the purpose that reaches detection by flow contrast as the sonic nozzle 111 of standard scale.
Again referring to Fig. 1, because the sealing surface of ball valve group 101 on the conventional apparatus and ball valve group 102 ball valve after frequent the keying is damaged very easily, again because standard set-up in when work, ball valve is under the negative pressure state, differential pressure is low before and after the ball valve, the sealing surface that air is easy between spheroid of closing and valve seat produces the leakage access to plant, cause Device Testing and calibration error to increase, promptly the gas flow by tested table 105 with increase by gas flow deviation as the sonic nozzle 111 of standard scale, even causing device to work, this phenomenon but often is difficult to detect.In fact, the critical defect of conventional apparatus is to produce gas loss in the A frame of broken lines.So-called gas loss installs exactly under detected state, because the negative pressure region that the device inside in the A frame of broken lines exists, cause that atmosphere is from the past internal flow in welding imprecision, flange connections or ball valve place, when surpassing certain wastage, device calibration operation distortion, even the paralysis of whole table apparatus can not be worked.Welding, flange connect all can accomplish sealing, is used for from actual making, and the leakage of ball valve is recurrent during conventional apparatus work.
Summary of the invention
The purpose of this utility model is for overcoming the deficiency of traditional sonic nozzle method gas flow standard device, a kind of gas loss amount that do not have is provided, seal reliably, detecting and the zero accurately wastage sonic nozzle method gas flow standard device of calibration
The purpose of this utility model is achieved through the following technical solutions: zero wastage sonic nozzle method gas flow standard device comprises the pressure unit at the pressure unit at upstream straight length, tested table place and temperature transmitter, tested table, downstream straight length, stagnation container place and temperature transmitter, stagnation container, sonic nozzle, header, buffer tank, vacuum pump, also comprises the sealed nozzle assembly is made up of solenoid valve, standard cylinder, butt-end packing member, vacuum rubber pad and seals the tong-test ammeter seal assembly that blind plate, vacuum rubber pad are formed by meter-clamping apparatus, H type.
Compared with prior art, the beneficial effects of the utility model are:
(1) owing to adopted the novel seal assembly, simple in structure, the saving cost is raised the efficiency;
(2) owing to the good airproof performance of novel seal assembly, the fatal interior burst that has overcome conventional ball valve falls into, and reaches zero wastage, compares with traditional device, and stability of the present utility model, reliability, precision all improve greatly.
Description of drawings:
Fig. 1 is the principle schematic of traditional sonic nozzle method gas flow standard device;
Fig. 2 is a structural representation of the present utility model, and indication device is one tunnel structure wherein.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
Referring to Fig. 2, the utility model comprises upstream straight length 3, the pressure unit 4 at tested table 5 place and temperature transmitter 7, tested table 5, downstream straight length 6, the pressure unit 8 at stagnation container 10 places and temperature transmitter 9, stagnation container 10, sonic nozzle 11, header 12, buffer tank 13, vacuum pump 14, also comprise be arranged between header 12 and the sonic nozzle 11 by solenoid valve 1-1, standard cylinder 1-2, butt-end packing member 1-3, the sealed nozzle assembly 1 that vacuum rubber pad 1-4 forms and be arranged at upstream straight length 3 and downstream straight length 6 between by meter-clamping apparatus 2-1, H type sealing blind plate 2-2, the tong-test ammeter seal assembly 2 that vacuum rubber pad 2-3 forms.As can be seen, the utility model has been abandoned the traditional ball valve group 101 and the ball valve group 102 that easily cause leakage in the gas, the substitute is sealed nozzle assembly 1 and meter-clamping apparatus 2-1, the H type be made up of solenoid valve 1-1, standard cylinder 1-2, butt-end packing member 1-3, vacuum rubber pad 1-4 and seals the tong-test ammeter seal assembly 2 that blind plate 2-2, vacuum rubber pad 2-3 form.
Again referring to Fig. 2, the internal cavity from the B of downstream straight length 6 to nozzle 11 endpiece A places, this part zone is gas loss amount forbidden zone, any leakage of this zone gas will make the device paralysis.State shown in Figure 2 is installed on the service pipe for H type sealing blind plate 2-2, in the time will detecting flowmeter, and tested flowmeter 5 in the piping erection of work, H type sealing blind plate 2-2 is replaced and unloads, and idle pipeline is all installed H type sealing blind plate 2-2.During device work, the switching of the solenoid valve 1-1 control sonic nozzle 11 in the sealed nozzle assembly 1, when needs were closed sonic nozzle 11, standard cylinder 1-2 promote-side face seal member 1-3 and vacuum rubber pad 1-4 carried out effective seal to the A place of sonic nozzle 11.When needs, the meter-clamping apparatus 2-1 in the tong-test ammeter seal assembly 2 promotes H type sealing blind plate 2-2 and vacuum rubber pad 2-3 under gas pressure, to the B place of downstream straight length 6 carrying out effective seal.
Claims (1)
1, a kind of zero wastage sonic nozzle method flow standard device, comprise the pressure unit at the pressure unit at upstream straight length, tested table place and temperature transmitter, tested table, downstream straight length, stagnation container place and temperature transmitter, stagnation container, sonic nozzle, header, buffer tank, vacuum pump, it is characterized in that:
Be provided with the sealed nozzle assembly of forming by solenoid valve, standard cylinder, butt-end packing member, vacuum rubber pad between described header and the sonic nozzle, be provided with the tong-test ammeter seal assembly of forming by meter-clamping apparatus, H type sealing blind plate, vacuum rubber pad between described upstream straight length and the downstream straight length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201341817U CN201269771Y (en) | 2008-09-11 | 2008-09-11 | Non-leakage air flow rate calibration device by sound speed nozzle method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201341817U CN201269771Y (en) | 2008-09-11 | 2008-09-11 | Non-leakage air flow rate calibration device by sound speed nozzle method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201269771Y true CN201269771Y (en) | 2009-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201341817U Expired - Fee Related CN201269771Y (en) | 2008-09-11 | 2008-09-11 | Non-leakage air flow rate calibration device by sound speed nozzle method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201269771Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121539A (en) * | 2010-12-27 | 2011-07-13 | 上海工业自动化仪表研究院 | Pre-inflatable pneumatic reversing valve |
| CN104501917A (en) * | 2015-01-04 | 2015-04-08 | 镇江市计量检定测试中心 | Ultra-large diameter sonic nozzle block type gas flowmeter calibrating device |
| CN103968907B (en) * | 2013-08-23 | 2016-12-28 | 中国人民解放军国防科学技术大学 | A kind of above-critical state and the close flow measuring apparatus of gaseous hydrocarbon fuel and method |
| CN109211372A (en) * | 2018-11-12 | 2019-01-15 | 中国计量科学研究院 | Low pressure critical flow venturi nozzle calibrating installation |
| CN111546030A (en) * | 2020-05-27 | 2020-08-18 | 湛江德利车辆部件有限公司 | One-key automatic quick-change device for sonic nozzle |
-
2008
- 2008-09-11 CN CNU2008201341817U patent/CN201269771Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121539A (en) * | 2010-12-27 | 2011-07-13 | 上海工业自动化仪表研究院 | Pre-inflatable pneumatic reversing valve |
| CN103968907B (en) * | 2013-08-23 | 2016-12-28 | 中国人民解放军国防科学技术大学 | A kind of above-critical state and the close flow measuring apparatus of gaseous hydrocarbon fuel and method |
| CN104501917A (en) * | 2015-01-04 | 2015-04-08 | 镇江市计量检定测试中心 | Ultra-large diameter sonic nozzle block type gas flowmeter calibrating device |
| CN104501917B (en) * | 2015-01-04 | 2018-09-18 | 镇江市计量检定测试中心 | Super large caliber sonic nozzle group formula gas flowmeter calibrating installation |
| CN109211372A (en) * | 2018-11-12 | 2019-01-15 | 中国计量科学研究院 | Low pressure critical flow venturi nozzle calibrating installation |
| CN111546030A (en) * | 2020-05-27 | 2020-08-18 | 湛江德利车辆部件有限公司 | One-key automatic quick-change device for sonic nozzle |
| CN111546030B (en) * | 2020-05-27 | 2021-11-26 | 湛江德利车辆部件有限公司 | One-key automatic quick-change device for sonic nozzle |
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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: 20090708 Termination date: 20150911 |
|
| EXPY | Termination of patent right or utility model |