CN204214590U - A kind of pressure-detecting device - Google Patents
A kind of pressure-detecting device Download PDFInfo
- Publication number
- CN204214590U CN204214590U CN201420658625.2U CN201420658625U CN204214590U CN 204214590 U CN204214590 U CN 204214590U CN 201420658625 U CN201420658625 U CN 201420658625U CN 204214590 U CN204214590 U CN 204214590U
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- pipeline
- detecting device
- impulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model relates to a kind of pressure-detecting device, comprise the impulse pipeline be connected with pipe under test, described impulse pipeline is provided with pressure-detecting device, it is characterized in that the blow down valve described impulse pipeline is also provided with for controlling to purge impulse pipeline described in gas flow purging; Described blow down valve comprises valve body, is provided with elastic parts in described valve body, and described valve body is divided into the first separate valve pocket and the second valve pocket by this elastic parts; Being provided with taper valve core in described first valve pocket, conflicts on described elastic parts in the bottom surface of this taper valve core; Described first valve pocket is communicated with constant voltage pipeline, and described second valve pocket is communicated with sweep gas pipeline.The sweep gas flow that the utility model enters impulse pipeline by blow down valve can change by self application impulse manifold pressure, change on year-on-year basis with the pressure surge in pipe under test, maintain the constant of the difference of testing pressure and purging pressure simultaneously, not only ensure to purge effect, and measuring accuracy is high, save purge flow rate, can carry out continuously purging and measuring.
Description
Technical field
The utility model relates to a kind of pressure-detecting device, specifically refers to the pressure-detecting device needing to purge pipeline.
Background technology
In the industries such as derived energy chemical, often need to carry out real-time control measurement to flue pressure.Metering system mostly is and directly draws a bypass measuring circuit from measurement point and carry out pressure measurement.If do not add safeguard procedures, the dust so in flue, powder etc. will pour in down a chimney in measuring circuit, and mouth is measured in blocking, can not get measured pressure value, loses real-time monitoring and control, even damage surveying instrument.
For this reason, measurement mechanism needs configuration blow device to carry out purging protection to measuring circuit.Blow device directly connects source of the gas usually, uses gas to carry out continuously or the purging work of interval measuring circuit.This traditional blow device narrow application range.When flue pressure amplitude is larger, flow is also more big changes, and especially when flue pressure raises, when flow obviously reduces, purge gas may pour in down a chimney, and purges function and can not get ensureing.In addition, the stopping state that the change of purge flow rate and measurement mouth occur, all can cause measured value that larger deviation occurs, not reach the accuracy requirement of measurement itself.
Purging for conventional apparatus and measuring existing the problems referred to above, also having some researchers and manufacturer doing linguistic term to purging measurement mechanism in the recent period.
China Patent No. is the utility model patent of ZL 200520074921.9 is a kind of blower of compensated wind-pressure measuring blow devices, its scavenging duct comprises inside and outside two pipes, interior pipe is allowed to purge pressure guiding pipe, by constant pressure source, air feed is carried out to blow device, by regulating inner tube length can change the inspiratory flow of pressure guiding pipe and the air blowing flow of scavenging duct, balance purging pressure reduction.The feature of this device is the error balancing measurement mechanism itself, but its flow still can change, narrow application range along with load change, needs manual shift.And after blocking on a small scale occurs in outlet, measuring accuracy can not meet.
China Patent No. be 200620068391.1 utility model patent be a kind of blower of compensated wind-pressure measuring blow device, it is characterized in that arranging compensation system in housing, compensation system connect transmitter.Compensation system comprises compensator body, needle-like composition, can be anti-blocking, can effectively sample again.But he needs manual shift purge flow rate and compensating differential pressure etc., if larger change occurs flue pressure, then need manually to readjust, there is inconvenience.
China Patent No. be 201220339024.6 utility model patent be a kind of pressure pipeline blow device, it is provided with valve, normally open solenoid valve and a secondary valve at pressure pipeline, connects gas-holder, controllably purge pressure tappings by normally closed solenoid valve.Purging separates with measurement and carries out by the feature of this device exactly, and achieves interval automatically by relay and purge, and saves airshed, avoids the error of manual shift.But it is limited that this device purges the period, can not fundamentally protect purge circuit not enter ash.The purge flow rate of this device equally can with flue change in pressure, and usable range is narrow, measures and there is error.
China Patent No. be 200620160053.0 utility model patent be automatic anti-clogging blowback device of pressure measurement, also measurement and purging are separated and carry out.By a tee ball valve, make high pressure air timing, purge instantaneously, prevent sampling part from blocking, ensure to measure accurately, consume gas also relatively little simultaneously, save manual shift labour.But the problem that this device also exists narrow application range, measuring error can not get control.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of for the present situation of prior art can stream pressure change carry out purging and the high pressure-detecting device of measuring accuracy in self application pipe under test.
The utility model solves the problems of the technologies described above adopted technical scheme: this pressure-detecting device, comprise the impulse pipeline be connected with pipe under test, described impulse pipeline is provided with pressure-detecting device, it is characterized in that the blow down valve described impulse pipeline is also provided with for controlling to purge impulse pipeline described in gas flow purging;
Described blow down valve comprises valve body, is provided with elastic parts in described valve body, and described valve body is divided into the first separate valve pocket and the second valve pocket by this elastic parts; Being provided with taper valve core in described first valve pocket, conflicts on described elastic parts in the bottom surface of this taper valve core;
Described first valve pocket is communicated with constant voltage pipeline, and described second valve pocket is communicated with sweep gas pipeline.
The elastic parts that can realize above-mentioned functions can have multiple, and preferably, described elastic parts can comprise elastic film and elastic component; Described elastic film is horizontally installed in described valve body and is divided into two by the inner chamber of described valve body, conflicts on elastic film in the bottom surface of described spool; Described elastic component is arranged in described second valve pocket, and conflicts respectively on the inwall of described elastic film and described valve body in the two ends of described elastic component.
Preferred described elastic film is silica gel thin film.
As improvement, described constant voltage pipeline can be connected gas source pipe by reduction valve with described sweep gas pipeline, and described sweep gas pipeline is also provided with flow control valve.
Compared with prior art, the utility model is provided with blow down valve between purging pipeline and impulse pipeline, and this blow down valve has throttling and constant current double action; The sweep gas flow being entered impulse pipeline by blow down valve can be changed by self application impulse manifold pressure, change on year-on-year basis with the pressure surge in pipe under test, maintain the constant of the difference of testing pressure and purging pressure simultaneously, not only ensure to purge effect, and measuring accuracy is high, save purge flow rate, can carry out continuously purging and measuring.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment schematic diagram;
Fig. 2 is the utility model embodiment cross-sectional schematic.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
As depicted in figs. 1 and 2, this pressure-detecting device comprises:
The impulse pipeline 2 be connected with pipe under test 1, described impulse pipeline 2 is provided with pressure-detecting device 3.Pressure-detecting device can select of the prior art any one, such as pressure unit, pressure transducer or tensimeter etc.
Impulse pipeline 2 is provided with the blow down valve 4 for controlling to purge impulse pipeline 2 described in gas flow purging.
In the present embodiment, blow down valve 4 comprises valve body 41, is provided with elastic parts 42 in valve body 41, and described valve body is divided into the first separate valve pocket 43 and the second valve pocket 44 by this elastic parts 42; Being provided with taper valve core 45 in described first valve pocket 43, conflicts on described elastic parts 42 in the bottom surface of this taper valve core.
First valve pocket 43 is communicated with constant voltage pipeline 5, second valve pocket 44 and is communicated with sweep gas pipeline 6.Constant voltage pipeline 5 is connected gas source pipe 8 with sweep gas pipeline 6 by reduction valve 7, and sweep gas pipeline 6 is also provided with flow control valve 9.
In the present embodiment, elastic parts 42 comprises elastic film 421 and elastic component 422; Elastic film 421 is horizontally installed in valve body and is divided into two by the inner chamber of described valve body, conflicts on elastic film 421 in the bottom surface of described spool 45; Described elastic component 422 is arranged in described second valve pocket 44, and conflicts respectively on the inwall of described elastic film 421 and described valve body in the two ends of described elastic component.
In the present embodiment, film 421 adopts silicon rubber to prepare, and elastic component 422 is spring.
The principle of work of this pressure-detecting device is described below:
Enter source of the gas in sweep gas pipeline after reduction valve decompression, obtain stable input pressure ρ
1, be then divided into two strands.Wherein main air is introduced in the second valve pocket of blow down valve by constant voltage pipeline; Secondary air flow enters the first valve pocket through flow control valve 3, then flows out through taper valve core, and purging pressure is ρ
3impulse pipeline.First valve pocket pressure is ρ
2, ρ
2be greater than ρ
3.Impulse pipeline pressure ρ
3, the second valve pocket pressure ρ
2, bleed pressure ρ
1with the elastic force acting in conjunction of spring on film, make the stream pressure via blow down valve outlet keep stable and balance, thus ensure that the stability of measuring error.The data that pressure unit is detected in real time are more accurate.
As pressure ρ in pipe under test
3during increase, purge flow rate has reduction trend, but taper valve core now above film is stressed larger, and film is out of shape downwards, promotes spring and is out of shape downwards, and spool aperture becomes large, purges air-flow and increases on year-on-year basis, purging can be carried out smoothly, maintain ρ simultaneously
3, ρ
2difference constant, ensure measuring accuracy.
As pressure ρ in pipe under test
3during reduction, purge flow rate has increase tendency, but taper valve core now above film is stressed also diminishes, film is upwards out of shape under the action of the spring, promotes spool moves, and reduces spool aperture, thus purging air-flow is reduced on year-on-year basis, both ensure that the realization purging function, maintain ρ again simultaneously
3, ρ
2difference constant, ensure measuring accuracy, also help saving purge flow rate.
Claims (4)
1. a pressure-detecting device, comprise the impulse pipeline (2) be connected with pipe under test (1), described impulse pipeline (2) is provided with pressure-detecting device (3), it is characterized in that the blow down valve (4) described impulse pipeline (2) is also provided with for controlling to purge impulse pipeline (2) described in gas flow purging;
Described blow down valve (4) comprises valve body (41), be provided with elastic parts (42) in described valve body (41), described valve body is divided into separate the first valve pocket (43) and the second valve pocket (44) by this elastic parts (42); Being provided with taper valve core (45) in described first valve pocket (43), conflicts on described elastic parts (42) in the bottom surface of this taper valve core;
Described first valve pocket (43) is communicated with constant voltage pipeline (5), and described second valve pocket (44) is communicated with sweep gas pipeline (6).
2. pressure-detecting device according to claim 1, is characterized in that described elastic parts (42) comprises elastic film (421) and elastic component (422); Described elastic film (421) is horizontally installed in described valve body and is divided into two by the inner chamber of described valve body, conflicts on elastic film (421) in the bottom surface of described spool (45); Described elastic component (422) is arranged in described second valve pocket (44), and conflicts respectively on the inwall of described elastic film (421) and described valve body in the two ends of described elastic component.
3. pressure-detecting device according to claim 2, is characterized in that described elastic film is silica gel thin film.
4. the pressure-detecting device according to the arbitrary claim of claims 1 to 3, it is characterized in that described constant voltage pipeline (5) is connected gas source pipe (8) with described sweep gas pipeline (6) by reduction valve (7), described sweep gas pipeline (6) is also provided with flow control valve (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658625.2U CN204214590U (en) | 2014-11-05 | 2014-11-05 | A kind of pressure-detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658625.2U CN204214590U (en) | 2014-11-05 | 2014-11-05 | A kind of pressure-detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204214590U true CN204214590U (en) | 2015-03-18 |
Family
ID=52983255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420658625.2U Withdrawn - After Issue CN204214590U (en) | 2014-11-05 | 2014-11-05 | A kind of pressure-detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204214590U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374517A (en) * | 2014-11-05 | 2015-02-25 | 中石化宁波工程有限公司 | Pressure detection device |
| CN114295279A (en) * | 2021-12-31 | 2022-04-08 | 中国铁建重工集团股份有限公司 | Air pressure detection device and detection method |
-
2014
- 2014-11-05 CN CN201420658625.2U patent/CN204214590U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374517A (en) * | 2014-11-05 | 2015-02-25 | 中石化宁波工程有限公司 | Pressure detection device |
| CN114295279A (en) * | 2021-12-31 | 2022-04-08 | 中国铁建重工集团股份有限公司 | Air pressure detection device and detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201476821U (en) | Double-channel pore plate gas flow rate measuring device with bypass bridge path | |
| CN204085645U (en) | With the gas flow standard device of self calibration structure | |
| CN103837215B (en) | Commutation valve type p.V.T.t method gas flow meter | |
| CN106885694B (en) | Air valve performance testing device and air valve performance testing method | |
| CN204214590U (en) | A kind of pressure-detecting device | |
| CN104374517A (en) | Pressure detection device | |
| CN103900665B (en) | Container combination and commutation valve type pVTt method gas flow meter | |
| CN104502162A (en) | Dust sampler and dust concentration calibrating device using dust sampler | |
| CN102565695B (en) | Wind pressure switch tester and control method thereof | |
| CN104122122B (en) | Pressure stability sampling apparatus | |
| CN206710036U (en) | For the equipment for the air-tightness for detecting aircraft air condition pipeline | |
| CN201476822U (en) | Dual-channel pore plate gas flow measuring device with multiple built-in parameters | |
| CN202149889U (en) | Intelligent resistance-capacitance type dew point instrument with high precision | |
| CN105890715A (en) | Verifying device of small-flow gas flow meter | |
| CN204202951U (en) | Online constant speed flyash sampler | |
| CN113514135B (en) | Flow disc flow measurement device and method based on mass flow feedback adjustment | |
| CN110044798A (en) | Check device and check method during an a kind of step and compensation ventilation rate master bar | |
| CN214951687U (en) | Flow disc flow measuring device based on mass flow feedback adjustment | |
| CN110702942B (en) | Positive-pressure continuous self-compensation blowing type anti-blocking wind speed and wind volume measuring method | |
| CN209432347U (en) | A kind of flow type micro-pressure sensor calibration equipment | |
| CN203719817U (en) | Pressure detector for on-line measurement of molten substances | |
| CN204788587U (en) | Transient state oil consumption appearance calibration system | |
| CN209102384U (en) | A kind of big flow, high-precision air bleed valve test device | |
| CN206946323U (en) | A kind of gas flow self-checking device | |
| CN208420301U (en) | High-accuracy adjustable leak hole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150318 Effective date of abandoning: 20171013 |
|
| AV01 | Patent right actively abandoned |